JPH0643813B2 - Reverse rotation prevention device for internal combustion engine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverse rotation preventing device for an internal combustion engine that detects reverse rotation of the internal combustion engine and immediately stops the rotation thereof.

[Conventional technology]

Conventionally, as this kind of device, two position signals which are deviated by a predetermined angle in synchronization with the rotation of the internal combustion engine are generated in the position signal generating means, and each position generated in the position signal generating means in the forward rotation and the reverse rotation. It has been considered to detect the reverse rotation by utilizing the fact that the generation phases of the signals are opposite and to cut off the ignition of the internal combustion engine (for example, Japanese Patent Laid-Open No. 55-137364).

[Problems to be solved by the invention]

However, in the above-mentioned conventional one, since the reverse rotation can be discriminated only when the internal combustion engine reverses from the normal rotation and the generated phases of the two position signals are opposite to the normal rotation, the normal rotation is switched to the reverse rotation. In the case of crossing, there is a problem that there is a time delay in determining the reverse rotation, and the reverse rotation continues for a certain time.

Therefore, it is an object of the present invention to quickly determine the reverse rotation of an internal combustion engine and prevent the reverse rotation immediately.

[Means for solving problems]

Therefore, according to the present invention, as shown in FIG. 1, position signal generating means for sequentially generating position signals at a plurality of angular positions of the internal combustion engine in synchronization with the rotation of the internal combustion engine, and the position from the position signal generating means. When a signal is input and the same position signal is continuously input, the same signal continuous input determination means for determining that the internal combustion engine is reversely rotating, and the internal signal engine reverse rotation by this same signal continuous input determination means The invention provides a reverse rotation preventing device for an internal combustion engine, which is provided with a cutting means for cutting at least one of ignition and fuel of the internal combustion engine.

[Action]

As a result, when the internal combustion engine switches from normal rotation to reverse rotation, the position signal generating means first generates the same signal as the last position signal generated during normal rotation, and thus the same position signal continues. When it is input, the same signal continuous input determining means immediately determines that the internal combustion engine has reversed, and drives the cutting means to stop the rotation of the internal combustion engine.

〔Example〕

 The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 2 is a block diagram showing the overall configuration of the first embodiment of the device of the present invention, and a 2-cycle 2-cylinder internal combustion engine will be described as an example. Reference numeral 1 is a reference signal signal rotor, which has one magnetic tooth on its outer periphery and is attached to the crankshaft so as to make one revolution per crankshaft revolution of the internal combustion engine. Reference numeral 2 is a first reference signal big-up coil arranged at a position facing the teeth of the reference signal signal rotor 1. One end of an output end of the first reference signal big-up coil is used as a first reference signal G _{1 in} an engine control unit (hereinafter referred to as ECU). ) 11 and the other end is connected to ground 9. This first reference signal G
Reference numeral ₁ is for outputting at a crank angle (CA) of 10 ° before the top dead center (BTDC) of the first cylinder of the internal combustion engine, which is a first cylinder discrimination signal and outputs a signal once per one revolution of the engine. Reference numeral 4 denotes a second reference signal pickup coil arranged at a position facing the teeth of the reference signal signal rotor 1.
One end of the output end is used as the second reference signal G _{2 by the} ECU 1
1 and the other end is connected to the ground 9. The second reference signal G ₂ is output at the BTDC 10 ° CA of the second cylinder, which serves as the second cylinder discrimination signal.
Outputs a signal once per revolution of the engine. An angle signal signal rotor 6 has 24 magnetic teeth on the outer periphery at equal intervals, and is attached to the crankshaft so as to rotate once per crankshaft rotation. Reference numeral 7 denotes an angle signal pickup coil disposed at a position facing each tooth of the angle signal signal rotor 6, one end of the output end of which is used as the angle signal Ne, and the ECU
11 and the other end is connected to the ground 9. This angle signal Ne is output every 15 ° CA crank. Reference numeral 10 denotes another sensor signal, which includes the first reference signal G ₁ , the second reference signal G ₂ , and the angle signal Ne.
Along with this, it is input to the ECU 11, and an optimal ignition timing and fuel injection amount are calculated by a microcomputer (not shown) built in the ECU 11 based on the information, and the igniter 12 and the injector 1 are calculated based on these calculated outputs.
3 are each driven.

FIG. 3 shows the rotation state of the reference signal signal rotor ₁ and the output states of the first reference signal G ₁ and the second reference signal G ₂ during normal rotation of the internal combustion engine. At the time of normal rotation, the first reference signal G ₁ and the second reference signal G ₂ are always output alternately.

FIG. 4 shows the rotation state of the reference signal signal rotor 1 and the output states of the first reference signal G ₁ and the second reference signal G ₂ when the internal combustion engine reverse rotation occurs. The second reference signal G ₂ is continuously output twice at the timing of switching from normal rotation to reverse rotation. It is understood that when the reverse rotation occurs in this way, either the first reference signal G ₁ or the second reference signal G ₂ always occurs continuously. In this embodiment, the reverse rotation is detected by discriminating between the signal output state at the time of forward rotation and the signal output state at the time of occurrence of reverse rotation, and fuel cut or ignition cut is performed so that the reverse rotation state does not continue.

5 to 7 show an ECU 1 for realizing the first embodiment.
1 is a flow chart showing a microcomputer in which 1 is incorporated.

FIG. 5 shows an initialization routine. In step 20, it is determined whether or not the starter is ON. If the starter is not ON, nothing is done and the process proceeds to step 30 in FIG. If the starter is ON, the program proceeds to step 21 to clear the memory MG, and then proceeds to step 22 to clear the flag FR and then proceeds to step 30 of FIG.

FIG. 6 is a reverse rotation determination routine. In step 30, it is determined whether or not the G ₁ signal is input to the G port. When the G ₁ signal is input, the process proceeds to step 31 and it is determined whether or not the memory MG is 1. If the memory MG is not 1, step 32
Proceed to and enter 1 in the memory MG, and return. Then, in step 30, it is determined again whether or not the G ₁ signal is input to the G port. If the G ₁ signal is not input (if the G ₂ signal is input), the process proceeds to step 34 and the memory MG is
Determine whether it is 1. If the memory MG is not -1, the process proceeds to step 35, where -1 is put in the memory MG and the process returns.
Then, the process proceeds to step 30 again, and it is determined whether or not the G ₁ signal is input to the G port. If the G ₁ signal is not input again (when the G ₂ signal is input), the process proceeds to step 34 and it is determined whether or not the memory MG is -1. At this time, since the memory MG is -1, it is determined that the G ₂ signal has been continuously input twice, and the process proceeds to step 33 to set the reverse rotation detection flag FR to 1
After setting, return. Also, when the G ₁ signal is continuously input twice, the process proceeds from step 31 to step 33, and 1 is set in the flag FR.

FIG. 7 shows a reverse rotation prevention processing routine. In step 40, it is judged if the reverse rotation detection flag FR in the reverse rotation judgment routine of FIG. If the reverse rotation detection flag FR is 1, the routine proceeds to step 41, where the injector 1
The fuel is cut by stopping the operation of No. 3 and then the routine proceeds to step 42, where the ignition is cut by stopping the operation of the igniter 12, and the engine is stopped.

A second embodiment of the present invention is shown in FIGS.

FIG. 8 is a block diagram showing the overall construction of the second embodiment, and a 2-cycle 3-cylinder internal combustion engine will be described as an example. 1
A is a disc for cylinder discrimination and reference position signal, the first cylinder,
2nd cylinder, 3rd cylinder TDC, 1 °, 2 °, 3 respectively
Three slits 1a to 1c of each groove width are cut so as to generate a pulse having an angle width of .degree., And are attached to the crankshaft so as to rotate in synchronization with the crankshaft. 2A is a disk 1
A light emitting diode arranged at a position facing each of the slits 1a to 1c on one side of A, one input terminal of which is connected to the storage battery terminal Ba, the other end thereof is connected to the ground 9, and power is supplied from the storage battery terminal Ba. It emits light when given.
Reference numeral 2B denotes a light receiving diode arranged at a position facing the slits 1a to 1c on the other surface of the disc 1A, and one output end thereof is inputted to the ECU 11 as a cylinder discrimination / reference position signal GNe. The other end is connected to ground 9. Reference numeral 10 is a signal from another sensor, which is a cylinder discrimination / reference position signal GN.
e is input to the ECU 11 together with e, and an optimal ignition timing and fuel injection amount are calculated by a microcomputer (not shown) built in the ECU 11 based on the information, and the igniter 12 and the injector 1 are output by these calculation outputs.
3 are each driven.

The operation of the above configuration will be described.

FIG. 9 (a) shows the output state of the cylinder discrimination / reference position signal GNe during normal rotation. In this way, at the time of forward rotation, 1 ° → 2
The signals are sequentially output in the order of ° → 3 ° → 1 ° → 2 ° → 3 ° signals. FIG. 9B shows the output state of the cylinder discrimination / reference position signal GNe when reverse rotation occurs. Immediately after switching from normal rotation to reverse rotation, the 3 ° signal is output twice consecutively. It can be seen that the reverse rotation occurs in this way and any one of the 1 °, 2 ° and 3 ° signals occurs twice in succession.

FIG. 10 shows a flowchart of a reverse rotation determination routine for realizing the second embodiment.

The initialization routine is almost the same as that of the first embodiment, and it is determined in step 20 in FIG. 5 whether the starter is ON. If the starter is not ON, nothing is done and the process proceeds to step 60 in FIG. If the starter is ON, the memory MG and the flag FR are cleared in steps 21 and 22, respectively, and the process proceeds to step 60 in FIG.

In the reverse rotation determination routine shown in FIG. 10, step 6
At 0, it is determined whether or not the input signal is the first cylinder (# 1) signal. If it is the # 1 signal, the process proceeds to step 61 and the memory M
It is determined whether G is 1. If MG is not 1, step 6
Go to 2 and put 1 in MG to return. The process proceeds to step 60 again, and if the # 1 signal is input again, step 61
Go to. The memory MG in step 61 has already been set to "1" the last time, and it is determined that the # 1 signal has been input twice consecutively, that is, the reverse rotation has been performed, and the routine proceeds to step 68, where the reverse rotation detection flag F
Let R be 1. 2nd cylinder (# 2) signal, 3rd cylinder (#
3) The signal is similarly processed in steps 63 to 68.

As described above, in the second embodiment, when two or more signals having different pulse angle widths are provided and the signals having the same pulse angle width are continuously output, it is determined that the reverse rotation has occurred. The subsequent reverse rotation prevention processing routine is the same as that of the first embodiment shown in FIG.

Although the present invention is applied to the two-cycle two-cylinder and three-cylinder internal combustion engines in each of the above-described embodiments, the present invention can be applied to any number of cylinder internal combustion engines. Therefore, if the present invention is applied to a 4-cycle internal combustion engine, backfire or the like that occurs during temporary reverse ignition of the 4-cycle internal combustion engine can be prevented. You can also

Further, in the second embodiment, the information of the position signal is the pulse angle width, but one position sensor may detect position information having different crest values or position information having different polarities. You may

〔The invention's effect〕

As described above, in the present invention, the same signal continuous input determination means immediately determines that the internal combustion engine has reversed, and the cutting means is driven to stop the rotation of the internal combustion engine. Can be done quickly,
There is an excellent effect that the reverse rotation can be immediately prevented.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to the claims of the present invention, FIG. 2 is a block diagram showing a first embodiment of the device of the present invention, and FIGS. 3 and 4 show the normal rotation and the reverse rotation of the first embodiment. Showing the rotation state of the signal rotor and the output state of each reference signal in FIGS. 5 to 7 show the initialization routine, the reverse rotation determination routine, and the reverse rotation prevention processing routine of the microcomputer in the first embodiment. Flow chart, Figure 8
(a) is a block diagram showing a second embodiment of the device of the present invention,
FIG. 9B is a front view showing the disc in the second embodiment, and FIG. 9 is a view showing the output state of the cylinder discrimination and reference position signal during the forward rotation and the reverse rotation of the second embodiment. FIG. 10 is a flow chart showing a reverse rotation determination routine of the microcomputer in the second embodiment. 1 ... Reference signal signal rotor, 1A ... Cylinder discrimination and reference position signal disc, 1a to 1c ... Slit, 2, 4
... First and second reference signal pickup coils, 2B
...... Light receiving diode, 11 ...... ECU, 12 ...... Ignator, 13 ...... Injector.

Claims (4)

[Claims] 1. A position signal generating means for sequentially generating position signals at a plurality of angular positions of the internal combustion engine in synchronism with the rotation of the internal combustion engine, and a position signal from the position signal generating means are input and the same. The same signal continuous input discriminating means for discriminating that the internal combustion engine is reversing when the position signals are continuously input, and the internal signal of the internal combustion engine is discriminated by the same signal consecutive input discriminating means. Reverse rotation prevention device for an internal combustion engine, comprising: a cutting means for cutting at least one of ignition of the fuel and fuel. 2. The position signal generating means includes a plurality of position sensors for sequentially generating position signals, and the same signal continuous input judging means continuously outputs a position signal from one of the plurality of position sensors. The reverse rotation preventing device for an internal combustion engine according to claim 1, which is for determining that the internal combustion engine is reversely rotating when input. 3. The position signal generating means sequentially generates position signals having different information at each angular position of the internal combustion engine, and the same signal continuous input judging means continuously outputs position signals of the same information. The reverse rotation prevention device for an internal combustion engine according to claim 1, which is for determining that the internal combustion engine is reversely rotating when input. 4. The reverse rotation preventing device for an internal combustion engine according to claim 3, wherein the information of the position signal is a pulse angle width.