CN1038704C - Ignition device for twin-cylinder internal combustion engine - Google Patents

Abstract

A double-cylinder ignition device for internal combustion engine is composed of 4 detected bodies 1-4 on the rotary body rotating synchronously with crankshaft of internal combustion engine, a pulse sequence obtained by detecting the passing state of said detected bodies by sensor, and a special point formed in the pulse sequence by the difference between one of detected bodies and another one of detected bodies, and the ignition signal generated by regulating the position relation between sensor and detected body 1-4. When the internal combustion engine is started, an ignition signal which is synchronously electrified with the rear end of the special point pulse and synchronously deenergized with the rear end of the latter pulse of the special point pulse is generated according to two different discrimination functions, so that the stepping advance angle is realized.

Description

Ignition device for twin-cylinder internal combustion engine

The present invention relates to an ignition device for a two-cylinder internal combustion engine mounted on a motorcycle, and in particular to an improvement in the structure of the device for improving the ignition characteristics at the start of the internal combustion engine.

In such an ignition device for a two-cylinder internal combustion engine, it is well known that a plurality of detected objects (protrusions) are arranged on the circumference of a rotating member that rotates synchronously with the crankshaft, and are detected by an electromagnetic detection sensor or the like to obtain rotation angle information, And then generate an ignition signal according to the rotation output of the internal combustion engine.

Usually, it is necessary to take out the specific angular position of the rotating member as a reference position while detecting the angle information of the rotating member, so as to generate such an ignition signal. Therefore, in order to obtain this reference position, the known method is:

(A) All but one of the plurality of objects to be detected are arranged at equal intervals, and special points at intervals different from the others are formed in the pulse timing output from the above-mentioned electromagnetic detection sensor or the like.

(B) Arrange the above-mentioned plurality of objects to be detected at equal intervals, and make one of them wider than the width of the other objects to be detected, and form pulses with other pulses in the pulse sequence output by the above-mentioned electromagnetic detection sensor, etc. Special points with different widths.

In addition, when the speed of the internal combustion engine changes, in order to correctly detect its special point, that is, the above-mentioned reference position, from the context of the above-mentioned pulse timing, the following reference position detection method is usually used, for example:

(1) Calculate the judgment function f ₁ with the pulse time interval T _{i -2} , T _i-1 and T _i of three pulses occurring continuously as variables, namely

f ₁ =(T _i-1 )^2/(T _i-2 ×T _i )

In the formula: "^" means exponentiation

The point at which this discriminant function _f1 is higher than a predetermined value is taken as the above-mentioned reference position (in the case of (A) above),

(2) Using the pulse widths Twi _-2 , Twi _-1 and Tw _i of the three consecutive pulses as variables to calculate the discriminant function f ₂ , namely

f ₂ ＝(Tw _i-1 )^2/(Tw _i-2 ×Tw _i )

In the formula, "^" represents exponentiation

The point at which the discriminant function f ₂ exceeds a predetermined value is taken as the above-mentioned reference position (the above-mentioned case (B)).

However, in this two-cylinder internal combustion engine, if it is in the compression stroke when starting, the spark plug can be detonated naturally without flashing, which is the so-called compression ignition phenomenon, and the speed will increase sharply at this time. When such a rotational speed changes rapidly, increasing the number of objects to be detected without setting the sampling synchronization and calculation cycle very densely will cause the problem that the reference position will be detected incorrectly.

In the past, as disclosed in JP-A-63-309750, for example, the discriminant function for detecting the above-mentioned reference position and the arrangement relationship of the detected object corresponding to the top dead center of the cylinder of the internal combustion engine are appropriately selected, that is, An appropriate firing reference for each cylinder is set.

Specifically, for example, on the above-mentioned rotating body, the first to fourth detected bodies are arranged at equal intervals of 90°, and the second detected body is larger than the others to form the above-mentioned special point V-type twin cylinder In the 90° crankshaft ignition internal combustion engine, when the above-mentioned discriminant function _f2 is used, two of the first, second, and third detected objects correspond to the top dead centers of the two cylinders constituting the internal combustion engine, that is, in terms of mutual position The pulse formed by the special point with a difference of 90° and its previous pulse or the pulse formed by the special point and the subsequent pulse are used as the ignition reference of each cylinder.

This prevents the aforementioned reference position from being erroneously detected when the rotational speed changes rapidly due to compression ignition or the like.

In this way, considering the characteristics of the discriminant function and the characteristics of the internal combustion engine itself, if the arrangement relationship of the object to be detected is selected by emphasizing the electrical operation of the above-mentioned special point in its coordinated operation, the above-mentioned false detection of the above-mentioned reference position can be reliably prevented.

Therefore, in order to improve the startability of the two-cylinder internal combustion engine in recent years, an ignition timing control method that shortens the time required for initial knocking by implementing a step advance angle corresponding to the engine speed at startup has been adopted.

This kind of step advance angle is to use the leading edge and trailing edge of the pulse output along with the detection of the object to be detected by the above-mentioned electromagnetic detection sensor, etc., and set its ignition time on the lag angle side (pulse trailing edge) when the internal combustion engine is started. ), and a method of setting its ignition time on the advance angle side (pulse front) after the initial deflagration of the internal combustion engine, the internal combustion engine can be started smoothly due to the adoption of such a step advance angle.

Here, when the above-mentioned conventional reference position detection method and false detection prevention method are used in the V-type twin-cylinder internal combustion engine, and the ignition timing control is performed using the step advance angle, the following new problems will appear again. .

For example, in order to prevent the V-type twin-cylinder 90° crankshaft ignition internal combustion engine from producing a falsely detected reference position as described in the ignition, the pulse formed by a special point and its previous pulse or the pulse formed by a special point and the pulse after it as each cylinder ignition benchmark. For this reason, the ignition position including the initial knock must be located at a specific point in a certain cylinder.

Therefore, in order to form the above-mentioned step advance angle in the above-mentioned situation, it is necessary to perform a time corresponding to the pulse width from the leading edge of the pulse formed at the special point as the ignition reference to the pulse width of other pulses that do not form the special point at the initial explosion. Calculation, and only the calculated time part needs to be used as the delay of the actual ignition time (with a delay angle).

However, when the initial explosion timing is set by such so-called arithmetic output control, a new problem arises as shown in FIG.

That is, in FIG. 10, FIG. 10(a) shows the cylinder cycle where the ignition reference is located at the above-mentioned special point, and FIG. 10(b) shows the sensor when using the special point setting method exemplified in the above-mentioned method (B). output, and Fig. 10(c) shows the output of its shaped waveform, especially when the internal combustion engine is started, there will be a change in the speed of the following situation,

(1) During the compression stroke of the cylinder, as the piston approaches the top dead center TDC as shown in FIG. 10( a ), its rising speed decreases.

(2) The sharp drop of the piston rising speed (instantaneous rotational speed) is due to the fact that the battery is fully charged and the battery is discharged to a certain extent, which is shown by the characteristic curves _L1 and _L2 in Figure 10(d). difference.

According to the change in the rotational speed, the ignition output for the above-mentioned calculation output control corresponding to the change in the rotational speed changes in the states shown in Figs. 10(e) and (f), respectively.

That is, usually when the above calculation time is used as TSPK, it is used

TSPK＝(θSTEP/90°)×T90

In the formula, θSTEP is the step advance angle

T90 is calculated as the pulse interval time. Therefore, when the calculated value TSPK is output as a timing setting, the angle of the timing value is represented by θSPK, then

θspk＝6×Ne×TSPK

In the formula: Ne is the number of revolutions (rev/min)

TSPK is the timing value (seconds)

The angle θspk becomes smaller as the number of revolutions Ne decreases. When the battery is fully charged, due to the sharp decrease in the rotational speed when the battery discharge state is close to the top dead center, as shown in Figure 10(f) compared with Figure 10(e), it will become

θSTEP'<θSTEP

Becomes a state with a value closer to the advance angle side

Therefore, even if the initial knock timing is set as close to the lag angle side as possible from the above-mentioned top dead center TDC when the battery is fully charged, when the battery is discharged, the initial knock timing will decrease as the discharge continues. Move to the advance angle side.

Therefore, as shown in FIG. 10(f), as the battery continues to discharge, the initial knocking timing is set on the advance angle side from the above-mentioned top dead center TDC, and knocking will be caused when the piston of the cylinder has not reached the upward limit position. , causing the internal combustion engine to reverse, etc., so that effective torque cannot be produced. Generally speaking, this phenomenon is called kickback.

The present invention is proposed in view of the above-mentioned actual situation, and its purpose is to provide an ignition device for a two-cylinder internal combustion engine, which can not only detect the reference position without error, but also effectively prevent the ignition of the battery regardless of the state of the battery. The actual step advance angle produces such a backlash, thereby improving its starting performance.

In order to achieve this purpose, the ignition device of the twin-cylinder internal-combustion engine of the present invention is provided with a rotating body that rotates synchronously with the crankshaft of the double-cylinder internal-combustion engine. A plurality of detected objects, a sensing device that outputs pulse timing angle information that detects the passing state of these detected objects, and an ignition signal generating device that generates an ignition signal that is added to the ignition coil of the internal combustion engine based on the output angle information , the plurality of detected objects includes a special point pulse forming body whose shape is different from all other detected objects and forms a special point pulse in the pulse sequence output by the sensing device, the sensing device and the plurality of When the object to be detected is in the rising process of the piston of one cylinder of the internal combustion engine and the piston of the other cylinder is near the top dead center, the sensing device and the above-mentioned special point pulse forming body are arranged in a relative positional relationship, and the above-mentioned ignition signal generating device is provided according to The first reference position setting device for setting the first reference position by detecting the first discriminant function of the trailing edge of the special point pulse in the above-mentioned angle information, and detecting the next pulse of the above-mentioned special point pulse in the above-mentioned angle information The second reference position setting device for setting the second reference position according to the second discriminant function of the trailing edge, when the internal combustion engine starts, the ignition signal starts to energize the ignition coil according to the first reference position set above, and The set second reference position generates a signal to de-energize the ignition coil that has been energized.

If the sensor device and a plurality of objects to be detected are in the above-mentioned disposition relationship, the same as the conventional method in preventing false detection of the reference position, emphasizing the electrical action on the special point, and the above-mentioned first and second reference positions are To ensure the detection accuracy, that is, when the internal combustion engine speed changes sharply due to the above-mentioned compression ignition, etc., the possibility of false detection of these reference positions is extremely low because it is based on the discriminant function.

The ignition signal generator generates an ignition signal for directly energizing and de-energizing the ignition coil based on the first and second reference positions set corresponding to the trailing edges of the two pulses when the internal combustion engine is started.

For a 4-stroke twin-cylinder internal combustion engine, its ignition output has a normal spark of the compression stroke and an invalid spark of the exhaust stroke. However, since the direct ignition output is generated corresponding to the first and second reference positions in this way, the time used for the initial deflagration of the internal combustion engine will naturally be shortened under the starting condition that the normal state is first produced in at least one cylinder.

Moreover, according to the above-mentioned structure of the ignition signal generating device, the angle at which the initial knock is caused may not be limited to the trailing edge of the second pulse at the above-mentioned second reference position, that is, the trailing edge of the special point pulse, so that the above-mentioned calculation output control can be unnecessary when the internal combustion engine is started. and so on to achieve a stable step advance angle, and then stable ignition characteristics without backlash can be obtained.

Furthermore, in the ignition device of the twin-cylinder internal combustion engine constituted in this way, the front edge of the above-mentioned special point pulse and the rear pulse of the special point pulse are determined as the ignition reference of each cylinder of the internal combustion engine, and the above-mentioned ignition signal generating device is also provided with:

(a) after each detection of the leading edge of each pulse in the above-mentioned angle information, the energization start means for starting the energization to the above-mentioned ignition coil on the condition of the previous pulse corresponding to the above-mentioned ignition reference pulse,

(b) A power-off device for de-energizing the above-mentioned ignition coil when the speed of the internal combustion engine is greater than a predetermined speed and corresponding to the above-mentioned ignition reference conditions after each detection of the leading edge of each pulse from the angle information,

(c) In the cylinder for which the pulse leading edge of the above-mentioned special point is set as the ignition reference, after detecting the leading edge of each pulse from the angle information, the power-off is calculated on the condition that the speed of the internal combustion engine is less than the predetermined speed and the pulse corresponding to the above-mentioned ignition reference An arithmetic control device that arrives at the time and sets it as a timing.

(d) An ignition preventive device for forcibly de-energizing when the ignition coil is energized at the second reference position set above.

Even in the case where an invalid spark is produced first due to the starting conditions of the internal combustion engine, the angle from the subsequent normal spark to the initial deflagration will be achieved through the cooperative action of the above-mentioned (a) starting energization device and the above-mentioned (d) ignition protection device. It is limited to the second reference position, that is, on the trailing edge of the pulse following the special point pulse, and even in this case, the condition for realizing a stable step advance angle can be well satisfied.

In addition, regardless of the starting conditions mentioned above, after the initial deflagration of the internal combustion engine, that is, after the step advance angle is realized, high-precision and stable ignition actions can be repeatedly realized through the coordinated actions of the devices (a)-(d).

The above various effects can be achieved through cooperation with each other. Furthermore, the predetermined speed of the internal combustion engine referred to in the above (b) power-cutting device and (c) arithmetic control device refers to the threshold speed for implementing the above-mentioned step advance angle.

In addition, to each of such devices (a)-(d) there are additionally:

(e) A reference position inspection device for checking whether the first and second reference devices set above are appropriate or not according to the first and second discriminant functions each time the trailing edge of each pulse is detected from the angle information.

(f) When the reference position inspection device determines which of the first and second reference positions is negative, cancel the setting of the first and second reference positions and restart the setting of the first and second reference positions device protection device etc. the above-mentioned ignition signal generating device, which can

The detection accuracy of the first and second reference positions can be ensured by means of the above arrangement relationship between the sensing device and multiple objects to be detected. In addition, it can also make:

·In the ignition operation after the initial knock, the tracking performance of the internal combustion engine is improved by checking its reference positions or by canceling/resetting these reference positions.

That is, a normal ignition timing can be ensured regardless of changes in the engine speed.

Furthermore, the above-mentioned first and second reference position setting means constituting the ignition signal generating device detect and set according to the first and second discriminant functions, for example, the following states are used as reference position detection and setting fixed device.

That is, the above-mentioned 1st reference position setting device is:

When Tw _i is used as the pulse width of the current pulse of the above pulse sequence, and Tw _i-1 is used to represent the pulse width of the previous pulse, the calculation

F(t ₁ )=Tw _i /Tw _i-1

As the first judging function, the first reference position is set on the condition that the obtained function value F(t ₁ ) is higher than the constant K1;

Or, when _Twi is used to represent the pulse width of the current pulse in the pulse sequence, and Tpi _-1 is used to represent the pulse interval time of the previous pulse, it can be calculated in the same way as the above-mentioned first discriminant function

F(t ₂ )=T _pi-1 /Tw _i

And means for setting the first reference position on the condition that the obtained function value F(t ₂ ) is lower than the constant K2.

And the above-mentioned 2nd reference position setting device is:

When Tw _i is used to represent the pulse width of the current pulse in the above pulse sequence, Tw _i-1 is used to represent the width of the previous pulse, and Tw _i-2 is used to represent the pulse width of the first two pulses, F is calculated as the second discriminant function (t ₃ )＝(Tw _i-1 )^2/(Tw _i-2 ×T ₁ )

In the formula: "^" means exponentiation

A device for setting the second reference position on the condition that the obtained function value F(t ₃ ) is greater than the constant K3.

Based on such a discriminant function, the target reference positions are detected and set to minimize the influence of changes in the engine speed, and are detected and set with higher accuracy than these reference positions.

The present invention will be described in detail below in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing the construction of an embodiment of an ignition device for a twin-cylinder internal combustion engine of the present invention.

Fig. 2 is a front view showing specific structures of a rotating body and a detected object constituting an angle information generating portion of the apparatus of this embodiment.

Fig. 3 is a graph showing the principle of generation of a step advance angle.

Fig. 4 is a graph showing the pulse sequence extracted by the device of this embodiment and the function waveform timing setting of the discriminant function used to detect the reference position of the internal combustion engine rotation angle of this embodiment.

Fig. 5 is a flowchart showing an angle sensor interrupt processing routine performed by the device of this embodiment.

Fig. 6 is a flowchart of a processing procedure for ignition output control by the apparatus of this embodiment.

Fig. 7 is a timing chart showing the state of the ignition operation when the internal combustion engine is started by the device of this embodiment.

Fig. 8 is a time chart showing the state of the ignition operation when the internal combustion engine is started by a conventional ignition device compared with Fig. 7 .

Fig. 9 is a time chart showing the state of the ignition operation when the internal combustion engine is started by a conventional ignition device compared with Fig. 7 .

Fig. 10 is a time chart showing problems caused by changes in the rotational speed of the internal combustion engine when a step advance angle is realized by means of arithmetic output control.

FIG. 1 shows an embodiment of an ignition device for a two-cylinder internal combustion engine according to the invention.

The device of this embodiment is based on the V-type twin-cylinder 90 ° crankshaft ignition 4-stroke internal combustion engine for two-wheel vehicles. By means of the step advance angle, the smooth start from the initial deflagration can be realized, and the subsequent ignition can be well maintained at the same time. The device of time constitutes.

First, the configuration of this embodiment will be described with reference to FIG. 1 .

In this embodiment device, the internal combustion engine 10 is the above-mentioned 4-stroke internal combustion engine with V-type twin-cylinder 90° crankshaft ignition for two-wheel vehicles. In FIG. 1, only the first cylinder (#1) 11 and the second cylinder (#2) 12 are shown for convenience.

In addition, an angle information generating unit 20 is provided near the crankshaft of the internal combustion engine 10 (not shown in the figure), and the angle information generating unit 20 extracts the rotation angle information of the above-mentioned internal combustion engine 10 .

That is, in this angle information generating portion 20 , the rotating body 21 is rotated synchronously on the crankshaft of the internal combustion engine 10 , for example, a disk-shaped member. On the circumference of the rotating body 21, four objects to be detected 1-4 made of magnetic materials are provided. When these detected objects 1-4 rotate, the angle signal is detected by the electromagnetic detection sensor (angle sensor) 22 fixed nearby, so a pulse sequence synchronized with the rotation angle of the internal combustion engine 10 is output from the sensor 22.

The ignition device needs to obtain the angle information of the internal combustion engine 10, that is, the above-mentioned rotating body 21 as mentioned above, and at the same time obtain the specific angular position of the rotating body 21 as a reference position. In the apparatus of this embodiment, the arrangement structure of the above-mentioned objects 1-4 facing the rotating body 21 is the state shown in FIG. 2 .

That is, as shown in Figure 2, each of the above-mentioned detected objects 1-4 is opposite to the rotating body 21, and is arranged at angular intervals such as θ1 = θ2 = θ3 = θ4 = 90 °. 4 The protrusion width is, for example,

θW ₁ = θW ₃ = θW ₄ = 10°, forming equal angles, except that the object 2 to be detected is used as a special point pulse forming body, and its protrusion width is, for example,

θW ₂ =50°, which forms an angle different from that of the objects 1, 3, and 4 described above.

Therefore, the pulse sequence output from the sensor 22 corresponds to the arrangement intervals θ1-θ4 and protrusion widths θW1-θW4 of the detected objects 1-4, and the ratio of 1 out of 4 pulses is higher than that of the other pulses. Wide special point (special point pulse). In this state, the angle information generator 20 outputs a pulse sequence and transmits it to the control device 30 as angle information SiG of the internal combustion engine 10 .

As shown in FIG. 1 , the control device 30 is composed of a waveform shaping circuit 31 , a microcomputer 32 , and ignition circuits 33 and 34 .

Further, the waveform shaping circuit 31 is a circuit that shapes the waveform of the pulse train output as the angle information SiG from the angle information generating unit 20 and converts it into a binary pulse train NSiG. The shaped pulse train NSiG is then input into the microcomputer 32 as an interrupt signal.

The microcomputer 32 is the ignition signal generating device of the device of this embodiment, which can be generated for the internal combustion engine 10 according to the pulse train NSiG input as the above-mentioned interrupt signal:

·Smooth start from the initial deflagration with the help of the step advance angle

Can maintain the ignition time well after the initial deflagration

ignition signal. The procedure for generating such an ignition signal using the microcomputer 32 will be described in detail below with reference to FIGS. 3-6.

The ignition circuits 33 and 34 are circuits for controlling on/off of the respective ignition coils 40 and 50 in accordance with an ignition signal generated by the microcomputer 32 .

Energizing these ignition coils 40, 50 through the corresponding ignition circuits and then de-energizing them generates a high voltage in their secondary coils. The generated high voltages drive their corresponding spark plugs 60 and 70 (generate sparks), respectively. Naturally, these spark plugs 60, 70 are arranged corresponding to the first and second cylinders 11, 12 of the internal combustion engine 10 described above.

In addition, when the spark plugs 60, 70 are used to ignite the cylinders 11, 12, in addition to generally being able to adjust the time corresponding to the time when the pistons of these cylinders reach the top dead center, the device of the above embodiment is also specially set to:

·When the piston in one cylinder is rising and the piston in the other cylinder reaches near the top dead center, the sensor 22 is made to face the detected object 2 as a special point pulse forming object.

The arrangement relationship between these sensors 22 and the objects to be detected 1-4 set in such a relationship is the ignition reference.

Fig. 3 is a graph showing the processing principle of the above-mentioned step advance angle. Before explaining the procedure for generating the ignition signal of the device of this embodiment through the above-mentioned microcomputer 32, briefly explain the step advance angle.

As shown in Figure 3, the so-called step advance angle refers to the use of the front and rear ends of the pulse output from the sensor 22 accompanying the detection of the detected object 1-4, that is, the falling edge of the above-mentioned binary shaping signal NSiG With the rising edge, the ignition timing when the internal combustion engine 10 is started is set on the retarded side (the rising edge of the signal NSiG), and the ignition timing of the internal combustion engine 10 is set on the advanced angle side (the falling edge of the signal NSiG) after the initial detonation of the internal combustion engine 10. Start method. By adopting such a step advance angle, the internal combustion engine 10 can be started smoothly as described above.

In Fig. 3, the arrow P1 indicates the top dead center position when the internal combustion engine 10 is started. If the rising edge timing of the above-mentioned signal NSiG at this position P1 is on the retarded side, there is no need to worry about the occurrence of the above-mentioned recoil after the initial deflagration. .

In FIG. 3 , "Nstp" represents the threshold revolution number of the internal combustion engine 10 using the step advance angle, "idle" represents the idling revolution number of the internal combustion engine 10, and "θSTEP" represents the advance angle value of the step advance angle. In addition, the graph in Fig. 3 shows the required ignition timing characteristics.

In this embodiment, regardless of the circumstances, such a step advance angle can be realized without arithmetic output control or the like, and the ignition signal of the internal combustion engine 10 is generated by the following program by means of the above-mentioned microcomputer 32.

Referring first to FIG. 4, the processing performed by the microcomputer 32 for detecting and setting the reference position based on the above-mentioned special point will be described.

4(a) in FIG. 4 shows the angle information (pulse sequence) SiG output by the above-mentioned angle information generating part 20 (sensor 220), and FIG. 4(b) shows the output of the above-mentioned waveform shaping circuit 31 corresponding to the angle information SiG. The waveform shaping signal NSiG. In the microcomputer 32, the falling edge and the rising edge of the shaping signal NSiG are used to interrupt, and each time the pulse width Tw and the pulse time interval Tp of the signal NSiG are respectively adjusted in the state shown in Figure 4 (c) and (d). Take measurements.

In addition, Fig. 4 (e) in Fig. 4 shows the sampling frequency of the above-mentioned signal NSiG when using the microcomputer 32, and Fig. 4 (f) shows the above-mentioned igniting reference with the following pulse of the special point pulse (pulse with a width of θW2). The angular position information Npos of the first cylinder 11 . In the microcomputer 32, the angular position of each cylinder is grasped by setting the angular position information Npos as an ignition reference to "0".

Therefore, when measuring the pulse width Tw of the time from the falling edge to the rising edge of the above-mentioned shaped signal NSiG, due to the above-mentioned special point, the measured content becomes the state shown in FIG. 4(g).

Here, even if the rotational speed of the internal combustion engine 10 changes, the microcomputer 32 can reliably recognize the rising edge of the special point pulse due to the existence of the special point pulse. If Tw _i is used to represent the measured pulse width of the current pulse, and Tw _i-1 is used to represent the measured pulse width of its previous pulse, then

F(t ₁ )=Tw _i /Tw _i-1

The calculation is carried out, and the rising edge of the above-mentioned special point pulse is identified on the condition that the obtained function value F(t ₁ ) is greater than the constant K ₁ . Hereinafter, the rising edge of the special point identified in this way is called the first reference position, and the relationship between the discriminant function F(t ₁ ) and the constant K ₁ is shown in FIG. 4(h).

In addition, as the first reference position of the rising edge of the above-mentioned special point pulse, the pulse width measured by the current pulse shall be represented by Tw _i , the time interval measured by the previous pulse of the pulse shall be represented by Tp _i-1 , and right

F(t ₂ )＝Tp _i-1 /Tw _i

The calculation can also be performed on the condition that the obtained function value F(t ₂ ) is smaller than the constant K2. Then, the interrupt processing described in detail in FIG. 5 is used as a device for setting the first reference position by using the discriminant function F(t ₂ ) and the constant K2. The relationship between the discriminant function F(t ₂ ) and the constant K2 is shown in Fig. 4(i).

On the other hand, in order to improve the judgment accuracy of the reference position in the microcomputer 32 and realize the above-mentioned step advance angle stably, another method may be used to identify the rising edge of the pulse after the above-mentioned special point pulse.

That is, in the microcomputer 32, represent the pulse width of the current pulse measured by _Twi , represent the pulse width of its previous pulse measured by Twi _-1 , and represent the pulse width of the previous _{2 pulses measured by Twi-} 2. pulse width, operation

F(t ₃ )＝(Tw _i-1 )^2/Tw _i-2 ×Tw _i (3)

In the formula: "^" stands for exponentiation

The rising edge of the pulse following the special point pulse is identified on the condition that the obtained function value F(t ₃ ) is greater than the constant K3. Hereinafter, the rising edge of the pulse subsequent to the identified special point pulse is referred to as the second position reference. The relationship between these judgment functions F(t ₃ ) and the constant K3 is shown in FIG. 4(j).

Furthermore, FIG. 5 and FIG. 6 show the processing procedures of the angle sensor interrupt processing and ignition output control processing of the microcomputer 32 based on such reference position identification or grasping of the angular position Npos. The procedure for generating the ignition signal with the microcomputer 32 is described.

In Fig. 1, after the internal combustion engine 10 is started with a starter, etc. omitted in the figure, the angle information SiG as shown in Fig. The circuit 31 outputs the waveform shaping signal NSiG as shown in FIG. 4(b). Then, the microcomputer 32 interrupts (angle sensor interrupt) according to the falling edge and rising edge of the waveform shaping signal NSiG output in this way, and repeats the interrupt process each time according to the program shown in FIG. 5 .

That is, when such an interruption occurs, the microcomputer 32 locks the moment when the interruption occurs in step 100, and stores its value (timing value) in the internal memory.

Then, the microcomputer 32 judges in step 101 whether the interrupt is generated by a rising edge or a falling edge. When the interrupt is generated by a rising edge, the above-mentioned pulse width Tw _i is measured in step 200, and in the case of a falling edge, the above-mentioned pulse time interval Tp _i is measured in step 300.

In the case of an interrupt generated by a rising edge, the microcomputer 32 then judges in step 210 whether the flag FLAG1 indicating that the above-mentioned first reference position has been set is set, and this flag FLAG1 will be cleared at the beginning.

Like this, microcomputer 32 just carries out following series of processing procedures under this occasion:

(1) Calculate the above formula (2) based on the pulse width Tw _i and the pulse interval time Tp _i-1 obtained at this time to obtain the value of the above-mentioned discriminant function F(t2) (step 211).

(2) On the condition that the value of the calculated discriminant function F(t ₂ ) is smaller than the above-mentioned constant K2 (step 212), drive the ignition circuit (ignition circuit 33) corresponding to the first cylinder 11 (#1), and start to give corresponding The ignition coil (ignition coil 40) is energized (step 213). The ignition signal related to the first cylinder 11 (#1) is denoted by _IG1 below.

(3) Set the above-mentioned flag FLAG1 to complete the detection and setting of the first reference position (step 214).

In the device of this embodiment, the processing program of steps 211-214 constitutes the first reference position setting means.

In the above-mentioned step 212, when the judgment is made on the principle that the obtained value of the discriminant function F(t ₂ ) is not less than the constant K2, if the interrupted pulse is not the pulse corresponding to the above-mentioned first reference position, it will Exit an interrupt handler.

On the other hand, if the interrupt is generated by a rising edge, under the situation that the above-mentioned flag FLAG1 has been placed or the placement of the flag FLAG1 in the above-mentioned step 214 has been completed, the microcomputer 32 then further judges in step 220 to indicate that the above-mentioned second Whether the flag FLAG2 of the reference position setting completion is set. The flag FLAG2 has also been cleared beforehand.

The microcomputer 32 performs a series of processing operations in this case.

(1) Calculate the above formula (3) according to the three continuous pulse widths _Twi , Twi _-1 and Twi _-2 obtained at this moment, and obtain the value of the above-mentioned discriminant number F(t ₃ ) (step 221).

(2) On the condition that the value of the obtained discriminant function F(t ₃ ) is greater than the above-mentioned constant K3 (step 222), stop driving the ignition circuit (ignition circuit 33) corresponding to the above-mentioned first cylinder 11 (#1), so that The corresponding ignition coil (ignition coil 40) is powered off (step 223). As a result of this de-energization, a high voltage is generated in its secondary coil and the corresponding spark plug (spark plug 60) is driven (sparking), ie a spark is generated in this cylinder due to de-energization.

(3) The above-mentioned flag FLAG2 is set, and the detection and setting of the second reference position are completed (step 224).

In the apparatus of this embodiment, the processing program of these steps 221-224 constitutes the second reference position setting means.

In the above-mentioned step 222, when the judgment is made on the basis that the obtained value of the discriminant function F(t ₃ ) is not greater than the constant K ₃ , if the interrupted pulse does not correspond to the above-mentioned second reference position, it will exit once Interrupt handling.

In the above step 224, if the setting of the flag FLAG2 is completed, the interrupt processing is completed.

On the other hand, when the interruption is caused by a rising edge, one of the above-mentioned flags FLAG1 and FLAG2 has been set, that is, after the initial spark is produced with the setting of the above-mentioned first and second reference positions, the microcomputer 32 In step 230, a process of confirming the reference position set above is performed.

During the reference position confirming process, the microcomputer 32 confirms whether the settings of the first and second reference positions are correct or not based on the discriminant functions F(t ₂ ), F(t ₃ ) and their respective corresponding constants K2 and K3.

When the result (step 231) of this reference position confirmation is judged to be abnormal, then carry out the abnormal processing that above-mentioned flag FLAG1 and FLAG2 are cleared simultaneously, so this interrupt processing ends (step 232) immediately. At this time, the first reference position setting process (steps 221-214) and the second reference position setting process (steps 221-224) described above are repeated again according to the subsequent rising edge interrupt.

And when the result (step 231) of above-mentioned reference position confirmation is judged to be normal, under the condition that this interruption is caused by the rising edge of the pulse (the pulse of angle position information Npos=0) that each cylinder ignition reference is set, If it is in the energized state, the so-called ignition protection process of immediately turning off the power is performed.

Furthermore, the processing procedures carried out in the above-mentioned steps 230-231 constitute the reference position inspection means of the apparatus of this embodiment. The processing program carried out in the above step 232 constitutes the protection device of the device of this embodiment, and the program carried out in the above step 233 constitutes the ignition protection device of the device of this embodiment.

Next, in the interrupt (angle sensor interrupt) processing, the processing operation of the microcomputer 32 when the interrupt is caused by a falling edge will be described.

In the case of a falling edge interrupt, the microcomputer 32 measures the pulse interval time Tp _i in the above-mentioned step 300, and then judges in step 310 whether the above-mentioned flag FLAG2 has been set.

Thus, the interrupt processing is exited during the state in which the flag FLAG2 has been cleared. If the flag FLAG2 has been set, the microcomputer 32 performs ignition output control processing in step 320 . For a detailed description of this ignition output control process, an example thereof is shown in FIG. 6 .

That is, in this ignition output control process, the microcomputer 32 first updates the contents of the identified angular position information Npos (step 3201), and then determines the current operation mode of the internal combustion engine 10 (step 3202). When judging the action mode, the number of revolutions slightly higher than the idling revolutions shown in Fig. 3 above is set as the threshold value. If the revolutions of the internal combustion engine 10 are lower than the threshold revolutions at this time, the "waveform synchronous mode" is used as the threshold. As for the purpose of determination, if the number of revolutions is higher than the threshold value, a determination based on the "calculation control method" is performed.

If the microcomputer 32 that carries out mode judgment in this way judges that mode is " calculation control mode " (step 3203), then carry out the well-known calculation control processing (step 3220) of relevant ignition time, so that it satisfies as shown in Fig. The required ignition timing characteristics are shown in the field of numbers.

On the other hand, if judged as "waveform synchronous mode" (step 3203), then carry out following processing with microcomputer 32 to realize above-mentioned step advance angle:

(1) The current rotation speed of the internal combustion engine 10 is determined from the pulse interval time Tp _i measured above (step 3210).

(2) If the determined number of revolutions is less than the threshold number of revolutions Nstp of the above-mentioned step advance angle (step 3211), then make the above-mentioned updated angular position information Npos equal to "3" as a condition (step 3214) corresponding to it The ignition coil of is started to energize (step 3215). If the determined rotational speed is smaller than the threshold rotational speed Nstp and the updated angular position information Npos is not "3", the ignition output control process is exited.

(3) When the determined number of rotations is greater than the threshold number of rotations Nstp of the above-mentioned step advance angle (step 3211), then the above-mentioned update angle position information Npos is equal to "0" as a condition (step 3212) for the corresponding ignition The coil is de-energized (step 3213).

(4) In addition, when the above-mentioned determined number of rotations is greater than the threshold number of rotations Nstp of the above-mentioned step advance angle (step 3211), if the above-mentioned updated angular position information Npos is "3" (step 3214), start Apply power to its corresponding ignition coil (step 3215). Furthermore, in this case, if the above-mentioned updated angular position information Npos is "3", the ignition output control process is exited.

In this "waveform synchronous method", the processes (1)-(4) are repeated every time an interruption is made by the falling edge of the waveform shaping signal NSiG.

However, for the cylinder whose ignition reference (angular position information Npos=0) is set by the falling edge of the above-mentioned special point pulse, that is, the second cylinder 12 (#2) in the device of this embodiment, in step 3211, the following When it is judged that the number of revolutions of the internal combustion engine 10 is smaller than the threshold number of revolutions Nstp of the step advance angle, it is also necessary to perform: (5) on the condition that the above-mentioned updated angular position information Npos is "0" (step 3231), for the above-mentioned Carry out operation (step 3233) until the time TSPK of power failure, and put it in the internal timer (step 3233).

The arithmetic control process 3230 shown by the dotted line in FIG. 6 is realized by the microcomputer 32 .

Here, the processing program for performing such arithmetic control processing 3230 (steps 3231-3233) constitutes the arithmetic control means in the apparatus of this embodiment.

Likewise, the processing procedures performed in the above-mentioned steps 3214-3215 constitute the power-on initiation means of the device of this embodiment. The processing procedures carried out in the above steps 3212-3213 constitute the power-off device of the device of this embodiment.

The device of this embodiment repeatedly performs the angle sensor interruption processing shown in FIG. 5 and the ignition output control processing shown in FIG. 6, whereby when the internal combustion engine 10 is started, the state shown in FIG. The ignition signals IG ₁ and IG ₂ .

Next, the ignition operation state when the internal combustion engine is started using the device of this embodiment will be described with reference to FIG. 7 .

7 (a) in FIG. 7 shows the cycle of each cylinder of the first cylinder 11 (#1) and the second cylinder 12 (#2) of the internal combustion engine 10, and FIG. 7 (b) shows the above-mentioned waveform shaping signal NSiG, and FIG. 7(c) represents the above-mentioned angular position information Npos of each cylinder.

In addition, reference numeral "B#1" corresponding to Fig.7 (a)-(c) shows the ignition standard of the 1st cylinder 11, and "B#2" shows the ignition standard of the 2nd cylinder 12. The ignition reference of the first cylinder 11 is set on the falling edge (front end) of the latter pulse of the special point pulse, and the ignition reference of the second cylinder 12 is set on the falling edge (front end) of the special point pulse. Same.

So far, when _the internal combustion engine 10 starts at time _t10 before the start of the compression stroke of the first cylinder 11 as shown in FIG. Determine the first reference position, start to energize the ignition coil 40 at the same time, and detect and set the second reference position at the subsequent time _t12 , and make the ignition coil 40 power-off at the same time, its state is shown in Figure 7 (f) The ignition signal IG ₁ changes like that.

Then, by de-energizing the ignition coil 40, a spark (normal spark) is generated in the first cylinder via the spark plug 60, and initial knocking of the internal combustion engine 10 is caused at time _t12 . The time of this initial deflagration is indicated by the symbol "0" in Fig. 7(d). In addition, the initial deflagration, as shown in Figure 7(b), is caused by the rising edge (rear end) part of the latter pulse of the special point pulse, that is, for the above Figure 3, it is more dead than the previous one. Point position P1 is induced on the side closer to the lagging angle.

On the other hand, due to the initiation of initial knocking, the number of revolutions (speed) Ne of the internal combustion engine 10 starts to increase in the state shown in FIG. 7(e). Then, after the number of revolutions Ne exceeds the above-mentioned threshold number of revolutions Nstp, through the above-mentioned ignition output control process of _{FIG .} As shown, the spark is generated at the falling edge (front end) of the pulse following the above-mentioned special point pulse, that is, the step advance angle is realized through the state shown in FIG. 3 previously. Furthermore, the spark generated at the above-mentioned time _t15 is a spark generated during the exhaust stroke of the squishy cylinder, and is a so-called null spark.

In addition, corresponding to such an ignition operation of the first cylinder 11, the ignition operation (operation of generating an ignition signal _IG2 ) occurs in the state shown in FIG. 7(g) in the second cylinder 12.

In the second cylinder, through the ignition output control process of Fig. 6, so that its angular position information Npos is equal to "3" at time _t13 or _t16 , the ignition coil 50 starts to be energized; when the angular position information Npos is equal to "0" At time _t14 or _t17 , the ignition coil 50 is de-energized.

On the other hand, the internal combustion engine 10 is started at time _t20 before the compression stroke of the second cylinder 12 starts, as shown in FIG. 7( h ).

At this time, the angle sensor of FIG. 5 is used to interrupt processing, and at the same time the first reference position is detected and set at time _t12 , the ignition coil 40 is energized, and at the time _t22 thereafter, the first reference position is detected and set. 2 reference position, the ignition coil 40 is de-energized, and its state change is shown as the ignition signal IG ₁ in FIG. 7(j).

However, at this time, the spark generated by the ignition signal _IG1 is an invalid spark, and the actual initial knocking of the internal combustion engine 10 occurs at the subsequent time _t26 . In this case, the energization cut-off at the initial knocking timing _t26 is performed by the previous ignition protection process (step 233 in FIG. 5 ).

So just as shown in Figure 7(b), in this case the initial deflagration is at the rising edge (rear end) part of the latter pulse of the special point pulse, that is, for the previous Figure 3, it is at the higher edge than the upper dead Point position P1 is caused closer to the lag angle side.

FIG. 7(i) shows the transition of the number of revolutions (speed) Ne of the internal combustion engine 10 in this case.

At this time, corresponding to the ignition operation of the first cylinder 11, the ignition operation of the form shown in FIG. 7(k) is performed in the second cylinder 12.

That is, in this case, the second cylinder 12 starts to be energized at the time _t23 when the angular position information Npos is equal to "3" through the ignition output control process of FIG. _24. At time _t25 after the above-mentioned operation time TSPK21 has elapsed, the power is turned off. Such operation output control is performed by the operation control process 3230 (steps 3231-3233) shown by the dotted line in FIG. 6 . However, in the apparatus of this embodiment, such arithmetic output control is not performed at the time of initial knocking.

8 and 9 are diagrams for comparing the ignition operation of the conventional device disclosed in, for example, the prior Japanese Unexamined Patent Publication No. 63-309750, with the above-mentioned ignition operation of the device of this embodiment.

The above-mentioned conventional device uses the output of the waveform shaping signal NSiG to interrupt (angle sensor interrupt) by its falling edge and rising edge, and repeats the interrupt process each time according to the procedure shown in FIG. 5 .

However, in the conventional device, the above-mentioned steps 210-214 related to the power-on processing such as detection and setting of the first reference position, and the power-off processing performed in step 223 are not performed, that is, when using the above-mentioned signal NSiG When the rising edge interrupts, for example, only the reference position setting and checking process are performed based on the above-mentioned discrimination function F(t3).

On the other hand, the ignition output control process (step 320 ) at the time of interruption by the falling edge of the signal NSiG is performed in the same manner as the process shown in FIG. 6 .

Furthermore, in the example of FIG. 8 , as in the above-mentioned embodiment, the ignition reference B#1 of the first cylinder is set at the falling edge (front end) of a pulse after the special point pulse, and the ignition reference B#1 of the second cylinder is set #2 is set at the falling edge (front end) of the special point pulse. At this time, as shown in Figure 8(d), if the internal combustion engine starts at time _t30 before the compression stroke of the first cylinder starts, the ignition action is carried out under the following conditions:

·First, at time t ₃₁ , the reference position is detected and set according to the above-mentioned discriminant function F(t ₃ );

·According to the ignition output control process shown in Figure 6, start to energize the second cylinder (correctly speaking, the ignition coil corresponding to it) at time _t32 (see Figure 8(g));

Then, when the ignition reference of the second cylinder is reached at time _t33 and the number of revolutions (speed) Ne of the internal combustion engine has not reached the threshold number of revolutions Nstp of the step advance angle at this moment, the ignition control process as shown in Fig. 6 is also performed Carry out calculus to time TSPK31, and calculus time TSPK31 is put into timing (with reference to Fig. 8 (e) and (g));

· Stop energizing the second cylinder at time _t34 after the elapse of the predetermined time, and cause initial knocking at time _t34 (see Fig. 8(g) and (d)).

Furthermore, the ignition action of the initial knock (time t ₃₅ -) is similar to that of the above-mentioned embodiment, except that the check of the reference position is performed only by the above-mentioned one of the discrimination functions.

In addition, in the example of Fig. 8, as shown in Fig. 8 (h), when starting at time _t40 before the compression stroke of the cylinder starts, the ignition action will be carried out under the following state:

· First, at time _t41 , the reference position is detected and set according to the above-mentioned discriminant function F( _t3 );

At time t ₄₁ -t ₄₄ , a spark is generated in cylinder 2 in a state similar to that of cylinder 2 at time t ₃₂ -t ₃₄ above, and since it is a spark in the exhaust stroke, it is an invalid spark (See Figure 8(k));

· Then, at time _t45 , spark is generated in the first cylinder by the above-mentioned ignition protection process, and it becomes a state related to the initial knocking of the internal combustion engine (see FIG. 8(j)).

In this way, in the embodiment of FIG. 8, when the internal combustion engine is started at time _t40 before the start of the compression stroke of the second cylinder, initial knocking synchronous with the waveform of the waveform shaping signal NSiG is caused, while at the time t40 before the start of the compression stroke of the first cylinder When starting at time _t30 , the initial deflagration is caused by the operation output control.

The example in Fig. 9 is different from this, it respectively sets the ignition reference B#1 of the first cylinder at the falling edge (front end) of the special point pulse, and sets the ignition reference B#2 of the second cylinder at the special point pulse On the falling edge (front end) of the previous pulse, as shown in Figure 9(d), when the internal combustion engine starts at time _t50 before the compression stroke of the first cylinder begins, the ignition action is performed in the following state:

First, at time t ₅₁ , detect and set the reference position according to the above-mentioned discriminant function F(t ₃ ); Then follow the ignition output control process shown in _Fig . In other words, its corresponding ignition coil) is energized (see Figure 9 (g));

Then, at time _t53 , the ignition reference of the second cylinder is reached, but at this moment, the number of revolutions (speed) Ne of the internal combustion engine has not reached the threshold number of revolutions Nstp of the step advance angle, so the ignition output control process is exited (see FIG. 9( e) and (g));

Then, at the time _t54 synchronous with the rising edge of the next pulse, through the above-mentioned ignition protection process, the power supply to the second cylinder is cut off, causing the initial knocking at the time _t54 (see Fig. 9 (g) and (d)).

In this case, the ignition operation (time t ₅₅ -) after the initial deflagration is basically the same as that of the above-mentioned embodiment, except that only one of the above-mentioned discriminant functions is used to check the reference position.

On the other hand, in the example of FIG. 9, as shown in FIG. 9(h), when starting at time _t60 before the compression stroke of the second cylinder starts, the ignition action is carried out in the following state:

·First, at time t ₆₁ , set the reference position according to the above-mentioned discriminant function F(t ₃ );

At time _t62 - _t64 , according to the action state of the second cylinder at the above-mentioned time _t52 - _t54 , the spark is generated in the second cylinder, but it is the spark in the exhaust stroke, so it is an invalid spark (see Figure 9(k));

・At this time, at time _t63 , power supply to the first cylinder is started according to the ignition output control process shown in FIG. 6 (see FIG. 9(j))

However, at time _t65 , although the ignition reference of the first cylinder has been reached, the number of revolutions (speed) Ne of the internal combustion engine at this time has not reached the threshold number of revolutions Nstp of the step advance angle, and the same ignition as shown in Fig. 6 The output control process calculates the time TSPK ₆₁ , and puts it into the calculation time TSPK timing (see Fig. 8 (i) and (j));

• Then, at time _t66 after the timing time has elapsed, the first cylinder is de-energized to initiate initial knocking at time _t66 (see Figure 9(k) and (h)).

In such an example of FIG. 9 , the start of the internal combustion engine at time _t50 before the start of the compression stroke of the first cylinder is synchronized with the waveform of the waveform shaping signal NSiG to cause initial knocking, and at time t50 before the start of the compression stroke of the second cylinder In the case of ₆₀ start, it will be in the state of initial knocking caused by the operation output control.

Can understand that device of the present invention can obtain following many excellent effects from comparing with the ignition action of device in the past:

(1) When starting the internal combustion engine before the _start of the compression stroke of the first cylinder 11 (# ₁ ) (refer to Fig. The rear ignition output (IG ₁ ) is a normal spark, and the startability to reach the initial detonation is crank angle 180°+α, which has been greatly improved. In the conventional devices illustrated in Figures 8 and 9, from The crank angle from start to initial deflagration is 450°+α, which does not improve at all. Moreover, in the case of starting in such a short period of time, the initial deflagration position is the falling edge and rising edge of the waveform shaping signal NSiG. That is, the front-end and rear-end pulses output by the sensor are used to realize the position of the step advance angle (the rear end of the next pulse after the special point pulse).

(2) In addition, when starting the internal combustion engine before the start of the compression stroke of the second cylinder 12 (#2) (see Fig. 7(h)-(k)), the discriminant functions F(t ₁ ), F(t ₃ ) for post ignition output (IG ₁ ) for position detection becomes ineffective spark, so the startability of obtaining normal spark to reach initial knock is crank angle 630°+α, which is equivalent to the conventional device. However, in this case, the initial deflagration position becomes a position where a step advance angle can be realized by utilizing the front and rear end pulses output by the sensor (in this case also the rear end of the next pulse after the special point pulse).

(3) In addition, two different discriminant functions are used for detecting and setting the reference position. Since the ignition output control is performed when the conditions obtained from these discriminant functions are satisfied at the same time, erroneous ignition control caused by a sudden increase in the rotational speed due to rotational speed variation and compression ignition at startup will not occur. Of course, the usual correct ignition timing can be ensured even after the initial deflagration.

As a result, the phenomenon such as the above-mentioned backlash does not occur, and stable ignition characteristics are obtained.

Furthermore, in the device of the present invention, in order to detect and set the first reference position, the discriminant function F(t ₂ ) shown in the above formula (2) can be used, and the above ( 1) The discriminant function F(t ₁ ) shown in the formula can similarly detect and set this first reference position.

Therefore, in this case, the same effects as those described above can be obtained in practice.

In particular, the discriminant function for detecting and setting the first reference position can be used as long as it is detected from the rear end of the above-mentioned special point pulse of the waveform shaping signal NSiG (angle information), and these discriminant functions F(t ₁ ) and any function other than F(t ₂ ).

Similarly, as the discriminant function for detecting and setting the second reference position, it is not limited to that as long as it is obtained from the rear end of the pulse following the special point pulse of the waveform shaping signal NSiG (angle information). The above-mentioned discriminant function F(t ₃ ), but any other function may be used.

In addition, in the device of the present invention, the ignition signal generator (microcomputer 32) is all added on the first and second reference position setting devices respectively set at the above-mentioned first and second reference positions:

(a) an energization initiating device for initiating energization to the ignition coil,

(b) De-energizing means for de-energizing the ignition coil,

(c) an arithmetic control device that calculates the time to reach the power failure and puts it into timing,

(d) Ignition guards for forced de-energization,

(e) a reference position inspection device for checking whether the set first and second reference positions are appropriate,

(f) When these reference positions are judged to be negative, the protective device which releases its setting.

However, at least the above-mentioned first and second reference position setting means are required as the ignition signal generating means. When the internal combustion engine is started, the ignition signal can send a signal to start energizing the ignition coil according to the above-mentioned first reference position, and can send a signal to start the ignition coil de-energization according to the second reference position of the above-mentioned setting.

Owing to be to produce direct ignition output corresponding to the 1st and the 2nd reference position like this, thereby the starting condition that produces normal spark earlier in at least one cylinder just can shrink the time required for the initial deflagration of internal combustion engine naturally.

However, since the ignition signal generating device is structured such that the angle at which the initial deflagration is initiated is preferably at the rear end of the second pulse at the above-mentioned second reference position, that is, the rear end of the special point pulse, it can be realized without the need for the above-mentioned when starting the internal combustion engine. By calculating the stable step advance angle of the output control, etc., stable ignition characteristics without backlash and the like can be obtained.

In addition, due to the combination of the above-mentioned (a)-(d) devices, even if the ineffective spark is generated first due to the starting conditions of the internal combustion engine, the angle of reaching the initial deflagration can be limited by means of the normal spark thereafter. The conditions for a stable step advance angle are also well met in this case at the rear end of the pulse following the special ignition pulse.

Therefore, as the ignition device of the invention, it is only necessary to add these (a)-(d) means to the above-mentioned first and second reference position setting means to be configured.

The device of the present invention as described above is also provided with the above-mentioned (e) reference position checking device and the above-mentioned (f) protection device, then after the initial deflagration, the correct ignition timing during normal times can be ensured as described above.

In the device of the above-mentioned embodiment, although it is the situation of using the ignition device of the present invention on the V-type twin-cylinder 90 ° crankshaft ignition internal combustion engine for the convenience of demonstration, the ignition device of the present invention is equally applicable to the V-type twin-cylinder 60 ° The crankshaft ignites the internal combustion engine, etc.

In the final analysis, as long as the rotating body rotates synchronously with the crankshaft of the internal combustion engine, the angular interval equal to the crankshaft interval at the top dead center between the cylinders of the internal combustion engine (for example, for a V-type twin-cylinder 60° crankshaft ignition internal combustion engine is 60° interval) It is only necessary to provide the above-mentioned plurality of objects to be detected.

Moreover, in this case, the following conditions are said to remain unchanged:

One of these detected bodies constitutes a special point pulse former;

Sensing device (sensor 22) and its multiple detected objects, when the piston of one cylinder of the internal combustion engine is in the process of rising and the piston of the other cylinder is near the top dead center, the sensing device and this special pulse are formed The bodies are configured in a relative positional relationship. Based on such conditions, if the ignition signal generating device is configured as described above, the same effect as above can be obtained for any two-cylinder internal combustion engine.

As explained above, the present invention can correctly detect two reference positions related to the rotation angle of the twin-cylinder internal combustion engine, that is, the rear end of the special point pulse and the rear end of the subsequent pulse of the special point pulse, according to the two discriminant functions.

In addition, by means of the present invention, when the internal combustion engine is started, the ignition coil is directly energized and de-energized according to the two reference positions, so that the time required to reach the initial deflagration of the internal combustion engine can be shortened naturally.

By means of the present invention, the initiation angle of this initial deflagration can be limited to the rear end of the next pulse after the special point pulse, so that a stable step advance angle without calculation output control, etc. can be realized when the internal combustion engine is started, and then obtained Stable ignition characteristics without recoil and other phenomena.

Claims (5)

1, a kind of ignition device for two-cylinder internal combusion engine, it is provided with: with the synchronous rotor that rotates of the bent axle of double cylinder IC engine; Therewith rotor corresponding with and constitute upper dead center bent axle a plurality of bodies that are detected of being provided with at interval of angle same at interval between the cylinder of internal-combustion engine; Detect the sensing device that passes through state and export the angle information that constitutes by pulse sequence that these are detected body; And the fire signal generating apparatus that is added on fire signal on the ignition coil for internal combustion engine according to the angle information generation of this output;

Above-mentioned a plurality of body that is detected includes with all variform, the particular point pulse form adult forming the particular point pulse in the pulse sequence that above-mentioned sensing device is exported that other is detected body;

Above-mentioned sensing device and above-mentioned a plurality of body that is detected, when the piston of a cylinder of internal-combustion engine is in the uphill process, and the piston of another cylinder is configured to relative position relation to sensing device and above-mentioned particular point pulse form adult near upper dead center the time; It is characterized in that:

Above-mentioned fire signal generating apparatus is provided with:

The 1st reference position setting device, it detects the rear end of above-mentioned particular point pulse from above-mentioned angle information, and sets the 1st reference position according to the 1st discriminant function; And

The 2nd reference position setting device, it detects the rear end of a back pulse of above-mentioned particular point pulse from above-mentioned angle information, and sets the 2nd reference position according to the 2nd discriminant function;

Described first discriminant function utilizes the pulsewidth of the existing pulse in the train of impulses of above-mentioned angle information, with the pulsewidth of its last pulse or the interpulse period of this last pulse and existing pulse, calculate a functional value, and with the comparative result of this functional value and a constant as condition, and set above-mentioned the 1st reference position;

Described second discriminant function utilizes pulsewidth, the pulsewidth of its last pulse and the pulsewidth of its first two pulse of the existing pulse in the train of impulses of above-mentioned angle information, calculate a functional value, and with the comparative result of this functional value and another constant as condition, and set above-mentioned the 2nd reference position;

This ignition mechanism generates when engine starting according to above-mentioned the 1st reference position that sets and begins to the energising of above-mentioned spark coil and make the signal of above-mentioned starting point fire coil outage according to above-mentioned the 2nd reference position that sets.

2, the ignition device for two-cylinder internal combusion engine described in claim 1 is characterized in that: the igniting benchmark that the front end of a back pulse of above-mentioned particular point pulse front end and particular point pulse is decided to be each cylinder of internal-combustion engine respectively;

Above-mentioned fire signal generating apparatus also is provided with:

The energising starting apparatus, it detects the front end of each pulse at every turn from above-mentioned angle information, under corresponding to the condition of the last pulse of the pulse of above-mentioned igniting benchmark beginning to above-mentioned spark coil energising,

Power breaker detects the front end of each pulse at every turn from angle information, internal-combustion engine rotational speed greater than set rotating speed and condition corresponding to the pulse of above-mentioned igniting benchmark under, make above-mentioned spark coil outage,

Operation control device, it is being decided to be above-mentioned special firing pulse front end in the cylinder of the benchmark of lighting a fire, each front end that from angle information, detects each pulse, rotating speed with internal-combustion engine is a condition less than above-mentioned set speed and corresponding to above-mentioned igniting reference pulse, calculate time of arriving outage and it is done regularly to insert, and

The igniting protective equipment is switched on as if above-mentioned spark coil in the 2nd reference position of above-mentioned setting, then makes it to force outage.

3, the ignition device for two-cylinder internal combusion engine described in claim 1 or 2 is characterized in that: above-mentioned fire signal generating apparatus also is provided with:

The reference position testing fixture, it all checks the 1st and the 2nd the whether suitable of reference position of above-mentioned setting according to the above-mentioned the 1st and the 2nd discriminant function respectively whenever the rear end that detects each pulse from above-mentioned angle information,

Protective gear, it is removed the setting of the 1st and the 2nd reference position, and resets the above-mentioned the 1st and the 2nd reference position setting device when being judged to be not by this reference position testing fixture to a certain side in these the 1st and the 2nd reference positions.

4, ignition device for two-cylinder internal combusion engine as claimed in claim 1 or 2, wherein, above-mentioned the 1st reference position setting device is when the pulsewidth of representing with Twi as the existing pulse in the pulse sequence of above-mentioned angle information, with Tw _I-1When representing the pulsewidth of its last pulse, right as above-mentioned the 1st discriminant function

F(t ₁)＝Twi _/Tw _i-1

Carry out computing, with its gained result's functional value F (t ₁) set above-mentioned the 1st reference position greater than constant K 1 for condition;

Above-mentioned the 2nd reference position setting device is when with Tw _iRepresent the pulsewidth of existing pulse in the pulse sequence, with Tw _I-1Represent the pulsewidth of its last pulse, with Tw _I-2When representing the pulsewidth of preceding 2 pulses, as above-mentioned the 2nd discriminant function, to F (t ₃)=(T _Wi-1) ^2/ (Tw _I-2* Tw _i)

Wherein: " ^ " represents power

Carry out computing, with gained result function value F (t ₃) set above-mentioned the 2nd reference position greater than constant K 3 for condition.

5, ignition device for two-cylinder internal combusion engine as claimed in claim 1 or 2, wherein, above-mentioned the 1st reference position setting device is with Tw _iRepresentative is as the pulsewidth of existing pulse in the pulse sequence of above-mentioned angle information, with Tp _I-1When representing the interpulse period of this pulse pulse last, as above-mentioned the 1st discriminant function and right with it

F(t ₂)＝Tp _i-1/Tw _i

Carry out computing, at its result function value of gained F (t ₂) less than above-mentioned the 1st reference position of setting under the condition of constant k2,

Above-mentioned the 2nd reference position setting device is with Tw _iRepresent the pulsewidth of existing pulse in this pulse sequence, with Tw _I-1Represent the pulsewidth of its last pulse, with Tw _I-2When representing the pulsewidth of preceding 2 pulses, as above-mentioned the 2nd discriminant function and to F (t ₃)=(Tw _I-1) ^2/ (Tw _I-2* Tw _i)

In the formula: " ^ " represents power

Carry out computing, and at gained result function value F (t ₃) greater than setting above-mentioned the 2nd reference position under the condition of constant K 3.

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