JPS6062665A - Engine controller - Google Patents

Abstract

PURPOSE:To improve starting performance by memorizing the stop-angle position of a crankshaft in case of engine stop and executing the next ignition control on the basis of the memorized data and starting ignition control operation simultaneously with engine start, in an electronic distribution type ignition control. CONSTITUTION:Diodes 33-36 are arranged between the secondary-side 32 of an ignition coil and spark plugs P1-P4, and the ignition voltage is distributed according to the direction of conduction of electric current with respect to the primary side 31 of the ignition coil. A means 6 for feeding operation electric power into an engine controller 1 for a prescribed time after engine stop by an ignition key 4 and a memory means 1 which can memorize and hold data independently of the operation of the ignition key 4 are installed. The crank-angle position data output form a crank-angle sensor 2 in case of engine stop is memorized into the memory means 1, and the ignition control operation in the early period of engine start is executed according to the crank-angle position data read-out from the memory means 1.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a control device for an internal combustion engine using an electric ignition method such as an automobile gasoline engine, and in particular, the present invention relates to a control device for an internal combustion engine using an electric ignition method, such as an automobile gasoline engine. The present invention relates to an engine control device equipped with an electronic power distribution ignition device that controls ore distribution.

[Background of the invention]

In electrically ignited internal combustion engines such as automobile gasoline engines, an ignition coil is used to generate high voltage.
Ignition devices that ignite the spark by supplying this high voltage to the spark plug and causing a spark discharge are mainly used. A current cutoff control means is required to cut off the primary coil current of the ignition coil and generate a high voltage.Furthermore, in the case of a multi-cylinder engine, the high voltage generated in the ignition coil is used to control the ignition of a predetermined cylinder. In many cases, a power distribution control means is also required to sequentially distribute power to the plugs1.By the way, in conventional engines,
A rotary shaft connected to the crankshaft at a reduction ratio of 1/2 is provided, and the above-described energization/cutoff control means is configured using electrical contacts that open and close according to the rotation of the rotary shaft, and further,
A power distribution device (distributor) rotationally driven by this rotating shaft constituted the power distribution control means described above. In addition, at this time, these two are generally constructed as an integrated mechanism, and this is often simply called a distributor.

However, in recent years, with the advancement of various electronic devices, microcomputers are also being used to control engines.
So-called electronic 1/engine control devices using electronic engine control devices have come into use, and the above-mentioned ignition devices have also come to be incorporated as one of the control items by electronic engine control devices. Ta.

By the way, even in this electronic engine control device, until recently, only electronic power supply/cutoff control for the above-mentioned ignition coil primary coil was used, and the above-mentioned power distribution control still remained in use. Most of them used distributors. For example, JP-A-55-40:259 and 55
There is -46059.

As engine control systems, including ignition control, become increasingly computerized, the need for high-voltage processing has been a major hindrance to the computerization of distributors, making it difficult to put them into practical use.

However, recent advances in high-voltage diodes have finally made it possible to realize electronic ignition systems that do not require a distributor, and electronic distribution ignition devices, so-called distributorless ignition systems, are now being used. . For example, there is Japanese Patent Application Laid-Open No. 56-92351.

This practical ignition type ignition system connects the secondary coil terminal of the ignition coil and each spark plug directly with a high voltage diode, and connects the polarity of these high voltage diodes to the primary coil of the ignition coil. A high-voltage power distribution function can be obtained for each cylinder group depending on the direction of the current to be supplied, eliminating the need for a distributor.For this reason, in the case of a 4-cylinder engine, the The direction of current application must be reversed every revolution of the crankshaft, and the current direction must be determined based on a reference cylinder position that corresponds to every two revolutions of the crankshaft.

By the way, in the electronic engine control device described above, a crank angle sensor is used to capture engine crank angle position data, and a reference position obtained when a predetermined cylinder of the engine (referred to as a reference cylinder) is at a predetermined stroke is determined. Signal mark reference signal, M-Ref and °C)
If the cylinders other than the reference cylinder are at the specified stroke, ′
Generally, the position signals (Ref and °C) obtained at the time of the engine are detected and necessary controls such as ignition control are carried out.

Incidentally, in an electronic engine control device including the electronic power distribution type ignition device described above, even if cranking is started at the time of starting the engine, ignition control cannot be started until the above-mentioned M-Ref signal is obtained. At this time, after starting cranking, M-R-ef
The time it takes to obtain a signal varies depending on the crankshaft stop angle position before starting cranking, but at its longest, it takes the crankshaft two revolutions.

Therefore, the conventional electronic engine control device equipped with an electronic power distribution type ignition device has the disadvantage that sufficient engine startability cannot be obtained.

[Purpose of the invention]

An object of the present invention is to eliminate the disadvantages of the prior art as described above, and to provide a Narikoma-α type electronic system capable of starting the ignition control operation simultaneously with the start of cranking of the engine starting jiff, and providing excellent startability to the engine. To provide engine control equipment.

[Summary of the invention]

In order to achieve this object, the present invention provides a memory that can retain certain data even after the engine key is turned off, and stores the stop angle position of the crankshaft when the engine is stopped. The ignition control at the time of the next engine start is performed based on the stored data representing the stopped position of the crankshaft, thereby allowing the ignition operation to be performed simultaneously with the start of cranking.

[Embodiments of the invention]

Embodiments of the engine control device according to the present invention will be described below with reference to the drawings.

FIG. 1 shows one embodiment of the present invention, which is applied to a four-cylinder, four-stroke engine. In the figure, 1 is a control device, 2 is a crank angle sensor, 3 is an electronic power distribution ignition device,
4 is an ignition key (engine key), 5 is a power source battery, and 6 is a relay.

The control device 1 is a microcomputer CPU], 0, RAM
ll.

Input/output interface (ilo) 122 power transistors 13, 14 for ignition. MφRef signal detection circuit 15. RAM backup power supply circuit 16. It is composed of a relay driving transistor 17 and the like.

Crank angle sensor 2 is 2 with respect to the engine crankshaft.
:It is attached to a rotating shaft connected with a reduction ratio of 1, rotates once for every 2 revolutions of the crankshaft, and has a crank angle of 720
A signal Ref is generated every 180 degrees as one cycle of the angle, and among these signals Ref, the signal that is generated at an angle corresponding to the reference cylinder, that is, the first cylinder (assumed to be l-0 degrees), is generated. The pulse width is made wider than the pulse width of the signal generated at other angular positions, and this is set as M・f.
Executes output as ief.

The electronic power distribution ignition system 3 has an intermediate tap on the primary coil 31.
f i (having an ignition coil 30 and this ignition coil 30
High voltage diode 3 connected in series to secondary coil 32
These high voltage diodes 33 to 36
are the spark plugs P1. of the first cylinder with the polarities shown respectively. 2nd cylinder spark plug P8; 3rd cylinder spark plug P8.
The spark plug P4 of the fourth cylinder is connected to the spark plug P4 of the fourth cylinder. The primary coil 31 of this ignition coil 30
While the current is being applied in the direction shown by the arrow α in the figure, ′
When the current is cut off, the high voltage diodes 33 and 36
When a high voltage with a polarity that conducts is generated in the secondary coil 32, and on the other hand, the current flows in the direction of the arrow and is cut off.
The high voltage in the direction in which the high voltage diodes 34 and 35 conduct is 2
This occurs in the next coil 32.

Relay 6 has transistor F as I/of the microcontroller.

When controlled to be turned on by the output from 12, ηb is activated, and even after the ignition key 4 is turned off, the control circuit 1
CP[Jl 0,1tAM11. 11012 and others in an operational state.

Please note that the ignition key 4. The battery 5 and the like are well known, and in this figure, the ignition key 4 is shown only to turn on and off the supply of power that is necessary for the operation of the control circuit 1, but it is also used to operate the starter. Needless to say, the present invention has functions such as 5.Next, the operation of this embodiment will be explained.

The ignition control operation while the engine is rotating after the engine has started is almost the same in both this embodiment and the conventional electronic power distribution type ignition system. , M-
M*Ref supplied from Ref signal detection circuit 15
The signal identifies the reference cylinder, selects the power transistors 13 and 14 according to a predetermined firing order, and turns them on and off.
Outputs an off signal.

Now, if the ignition order in this example is 1-3-4-2, and the first cylinder is the reference cylinder as mentioned above, then the CP
U 1 +] detects the M-Refi word, it determines that the ignition order is the ml cylinder, and thereafter the M.R.
Until No. ef lla is detected, each time the TLef signal is detected, the 3rd cylinder, the 4th cylinder, and the 2nd cylinder are ignited; ignition control 1rTll is performed at the same place sequentially in the order of 1μ. Then, when No. 1'VI-Refl'rT appears, the ignition order returns to the first cylinder.

Now, in this way, the CPU 10 can determine the cylinder in the ignition order, so CP (Jlo is
When the ignition order is in the 1st cylinder and the 4th cylinder, the transistor 13 is turned on and off, that is, the ignition coil 30 is turned on and off.
A current is passed through the next coil 31 in the direction of arrow α, and then cut off at a predetermined ignition timing, so that the ignition order is changed to the second cylinder and the third cylinder.
When the cylinder is in the cylinder, the transistor 14 is controlled on and off to flow current through the primary coil 31 of the ignition coil 30 in the direction of the arrow, and this is also ignited at a predetermined ignition timing. As a result, sparks are generated in the ignition gloves P1 and P4 at the ignition timing of the first cylinder, and sparks are generated in the ignition plugs P and Pl at the ignition timing of the next third cylinder.
Similarly, sparks are generated in spark plugs P4 and Pl at the ignition timing of the fourth cylinder, and sparks are generated in spark plugs P1 and P3 at the ignition timing of the second cylinder, so that power distribution operation can be obtained without using a distributor. become.

As is clear from the above explanation, in this electronic power distribution system, sparks are generated even in the spark plugs of cylinders that are not in the firing order, but the effect of this can be overcome with a practical stop; There is no risk of any problem arising in the practicality of the system.

Now, as mentioned above, the above ignition control operation is basically the same in both the embodiment of the present invention and the conventional example, but in the above embodiment, the process shown in FIG. is executed by a microcomputer including CPU10 of the control device 1.

The process shown in FIG. 2 is an interrupt process based on the timing at which the Ref signal from the crank angle sensor 2 is generated. Check 1 and 11 to see if the signal was just Ref M, or M e, Ref 18. If the result is YE or S, the ignition order at that time should be the 1st cylinder. , in step 2, set the cylinder signal to the next cylinder number, that is, 3, and then proceed to step 3, where the microcomputer's Il
o Change the firing order cylinder numbers of the 12 boats to 1st and 4th,
That is, it is set to the one for transistor 13. Then, as the process of step 4, the above step 2
Store the cylinder signal = 3 set in FLAMII.

Note that this RAM II is always supplied with a predetermined backup power from the battery 5 via the power supply circuit 16, so that it is possible to retain the stored data regardless of the operation of the ignition key 4, which is a so-called backup. It is RAM.

After completing step 4, the process exits and returns to the process before the interruption.

On the other hand, if the result in step 1 is NO, that is, the interrupt at this time is due to a Ref signal other than the M-Ref signal, the process proceeds from step 1 to step 5.
A certain generous signal is stored in RAMI 1 one after another, and these signals are sequentially checked in the following steps 6 and 7. First, when the cylinder signal is 3, the next cylinder signal is set to 4 in step 8, and then the next cylinder signal is set to 4. Proceed to step 11, while the cylinder signal is 4.
79), proceed from step 7 to step 9 and set the next cylinder signal to 2, and if the results in step 6.7 are both No, the cylinder signal read from RAMII should have been 2. , in this case step 10
Set the next cylinder signal to 1 and proceed to step 3 or 11, respectively.

As mentioned above, the process in step 3 is performed when the ignition order at that time is the 1st cylinder or the 4th cylinder, so the I/Q12 boat is set to the 1st cylinder. It is set for 4-ki 1 life, but in step 11, the conditions that come here are that the ignition order at that time is the 3rd cylinder and the 2nd cylinder.
Ilo 12 here because it was at a time when I was feeling snobbish.
ignition for the third and second cylinders, that is, the transistor 14 is set to the state in which it should be operated.

Therefore, as a result of the process shown in FIG. 2 being performed for each Ref signal, according to the above embodiment, the number of the cylinder that will be the next firing order is always sequentially stored in the RAM 11 as a cylinder signal. .

On the other hand, in this embodiment, a relay 6 is provided, and accordingly, the following conditions are set for the CPUxoK of the microcomputer to control the operation of this relay 6. That is, the relay 6 operates immediately when the ignition key 4 is turned on, operates in parallel with the ignition key 4 to supply operating pressure to the CPUIQ of the microcomputer, and also operates when the ignition key 4 is turned on. Even when it is turned off, the relay 6 continues to operate until the predetermined period of time 1 has elapsed, and the CPU 10 starts the 21st cycle.
This is so that the burial of the earth can continue as it is.

As a result, according to the above embodiment (i, ignition key
4 is turned off, so that when the Enshinka''-1 stop (・工, then σ Funononku・1・Yu'1 tei I
J: Corresponding to the position, the number of the cylinder that will fire first when the crankshaft is rotated next time will always be stored and remain in the back amplifier RAM II as the cylinder number IA.

Furthermore, in this embodiment, when the ignition key 4 is turned on, the R
ef Until the signal is detected, the microcomputer's c
The program is configured so that the 31st idle processing is executed by pui o.
4 ignition keys.

When the engine is turned on, the control system is initialized by the microcomputer in step 20, and as a process in step 21, the cylinder signal from the back amplifier RA Mll is read out, and then in step 22, the cylinder signal that has just been read out is read out. Learn the cylinder signal and perform either step 23 or step 24 depending on this (C). Here, steps 2:3 and 24 correspond to steps 11 and 3 in the broom 2 figure, and are Therefore, according to this embodiment, the ignition key 4 is turned on and
When attempting to start the engine, the ignition order has already been determined prior to engine cranking by the starter, and as the engine starts cranking, the Then, ignition is performed for a predetermined amount of air N,'4'i.

Next, the above results will be explained using the time charts of FIGS. 4(a,) and (b). When the processing according to FIG. 2 is performed, t=t 4 K<
As shown in I(f)), at time t. If the ignition key is turned off and the engine stops at time t1, then at time t1 the next cylinder signal in the ignition order at that time is stored in RAM II. The microcomputer Q'! of the control device 1 is kept in the kb production mode until time t2, and the RAMI of the cylinder signal at time t1 is
It is possible to ensure that the storage process to I is carried out reliably.

Next, as shown in FIG. 4(b), when the ignition key 4 is turned on at time t8, the processing according to the 31st case is performed, and the FRAM
At that time, it is stored in ~・Ruki M・f word (4) Force'
- read out, which causes the ignition control car to perform immediately f->
be made to be Therefore, as soon as cranking is started at a subsequent time point t, the ignition car is turned on, thereby ensuring a reliable start. After this, the engine will rotate and the crank angle sensor 2 will be detected.
At the point when a signal is detected, there is no need to move on to the processing in accordance with the ignition space 1IfIH diagram 2.

Therefore, according to this embodiment, as soon as the cranking of the engine starts at the start of the engine, the proper ignition is performed immediately from the first ignition timing,
Starting performance can be significantly improved.

In addition, in the above embodiment, the time required for the relay 6 to return after the ignition key 4 is turned off may be set to an arbitrary point after the engine has completely stopped. , engine stoppage may be detected using data from a rotational speed sensor, etc., and a predetermined delay may be applied to turn off the control signal to the transistor 17. Alternatively, () may be simply delayed using a timer. Moyo ℃
・.

On the other hand, when controlling the self-adhesive engine, it may be necessary to continue controlling certain control items for a while (even when the ignition key is turned off).
In such a case, if the operating power supply delay cutoff function for the control device for this purpose is shared with the function necessary for the present invention, the increase in cost can be reduced.

〔Effect of the invention〕

As explained above, according to the present invention, even in the Kameko power distribution system ignition control, ignition can be performed immediately at the start of cranking at the time of starting, thereby eliminating the drawbacks of the conventional technology and providing excellent starting characteristics. An engine control device having an electronic power distribution type ignition device can be easily provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the engine control device according to the present invention, FIGS. 2 and 3 are flowcharts for explaining the operation, and FIG. 4 (αL (h) is a timing chart for explaining the operation. 1...Control device, 2...Crank angle sensor, 3...Electronic power distribution ignition device, 4...
Ignition key, 6...Relay. Kaya 2 Hard 3rd mouth

Claims (1)

[Claims] 1. An electronic power distribution type electronic engine control device including a diode between the secondary side of the ignition coil and the spark plug, and distributing the ignition voltage depending on the direction of current flow to the primary side of the ignition coil. , a means for supplying operating power to the engine control device for a predetermined period even after an operation to stop the engine with the ignition key, and a memory means capable of storing and retaining data regardless of the operation of the ignition key, An engine control device characterized in that the crank angle position data is stored in the memory means, and the ignition control operation at the beginning of engine startup is performed based on the crank angle position data read from the memory means.