JPH01300039A - Rotation detector and engine controller - Google Patents

Abstract

PURPOSE:To reduce the costs of a rotation detector by enabling the same to output reference position signals including pulses for fuel injection reference and ignition timing reference and angle signals including pulse group for judging cylinders and changeable pulses to ignition signals. CONSTITUTION:At a rotary plate 1 rotating interlocked with a crank shaft, there are provided a fuel reference slit 2 for reference position signals and slit 3 for ignition timing reference, cylinder judging slit 4 for angle signals and slit 5 for igniting at start-up. A photoelectric type pickup (not shown) is provided in the vicinity of the plate 1 to generate reference position signals including fuel injection reference pulses and ignition timing reference pulses and angle signals including pulse group for judging cylinders and changeable pulses to ignition signals until the next cylinder piston reaches a top dead point after a certain cylinder piston reaches a top dead point 1. It is thus possible to simplify the construction of a rotation detector as well as to facilitate the manufacture of the plate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotation detector and an engine control device, and more particularly to a rotation detector and an engine control device having an electronic power distribution function and suitable for engine control and backup systems.

[Conventional technology]

A conventional engine control device having an electronic power distribution function, as described in Japanese Patent Application No. 61-105548, is a device that generates a pulse having a width corresponding to each cylinder when the piston of each cylinder reaches a predetermined position. A rotation detector is used that outputs an angle signal composed of pulses at each predetermined rotation angle, and the reference cylinder is determined from this reference position signal and angle signal, and the signal is distributed to each cylinder. This is a control method that distributes the ignition signal to each cylinder by Also, as a backup method, Utility Application No. 61-13108
As described in No. 5, this is a method of switching to a backup ignition signal with a constant pulse width using the angle signal after detecting an abnormality in the control CPU.

[Problem to be solved by the invention]

The above-mentioned conventional technology uses a rotation detector that outputs a pulse reference position signal with a width corresponding to the cylinder when the piston of each cylinder reaches a predetermined position, and also outputs a pulse angle signal at every predetermined rotation angle. Because this uses
For example, since it is necessary to have a slit that outputs one pulse for every 1° of angle signal dist angle, the accuracy of the slit width and slit spacing must be strictly controlled to ±0.25°, which makes it difficult to process rotary plates. The signal slits are created using an etching method that involves melting metal and making holes, which results in high costs. In addition, in order to minimize changes in signal pulse width and period caused by rotational fluctuations or battery voltage fluctuations, the circuit that shapes the waveform of the signal obtained by the photoelectric pickup becomes complicated, and the electronic power distribution equipment and backup equipment are also complicated. The circuit configuration is as follows.
There was a problem of high cost for the entire system.The purpose of the present invention is to solve the problems of the above-mentioned conventional technology and to have a new rotating plate structure with a signal slit pattern and a take-in circuit that make it possible to reduce costs. To provide rotation detectors and engine control devices.

[Means to solve the problem]

The above object is to provide a shaft that rotates in synchronization with the rotation of a crankshaft of an engine having a plurality of cylinders, and a rotary plate having a reference position signal slit and an angle signal slit that rotates in synchronization with the rotation of the shaft.

In a rotation detector including a photoelectric pickup that generates and outputs a reference position signal and an angle signal using the rotary plate, and an engine control device having the rotation detector, a piston of a certain cylinder reaches top dead center. Later, until the piston of the next cylinder reaches top dead center, it can be switched to a reference position signal containing two types of pulses: a fuel injection reference pulse and an ignition timing reference pulse, a pulse train for cylinder discrimination, and an ignition signal. A rotation detector configured to output an angle signal including pulses, and a rotation detector configured to output an angle signal including a pulse, and a group of signals output from the rotation detector are inputted to calculate the fuel injection amount and ignition timing. This is achieved by an engine control device that outputs control signals.

[Effect]

The rotation detector and the engine control device measure the period between the fuel injection reference pulse and the ignition timing reference pulse of the reference position signal output from the rotation detector to detect the engine rotation speed, and The operation of the fuel injection control and ignition control programs is started from the rising edge of the reference position pulse and the ignition timing reference pulse, respectively, and the fuel injection reference pulse of the two types of pulses of the reference position signal is compared with the ignition timing reference pulse. The pulse width is wide, and the rising and falling edges of the pulse train for cylinder discrimination included in the angle signal are counted during the period of the fuel injection reference pulse, and each cylinder is discriminated based on the number of times. A regular ignition signal is output based on the timing reference pulse, and at the time of starting or backup, a pulse that can be switched to the ignition signal included in the angle signal is output as a fixed ignition signal, and the ignition signal is determined based on the cylinder discrimination result. It can be distributed to each cylinder.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 7. This embodiment describes a rotation detector and engine control device for a six-cylinder engine equipped with an electronic power distribution system.

FIG. 1 is a schematic plan view of a rotating plate of a rotation detector showing an embodiment of the present invention. In Fig. 1, 1 is a rotary plate, 2 is a slit for fuel reference for reference position signal, 3 is also a slit for ignition timing reference, 4 is a slit for cylinder discrimination for angle signal, and 5 is slit for ignition at start time. It is. This rotation detector consists of a shaft that rotates in synchronization with the rotation of the crankshaft of an engine having multiple cylinders (not shown), a reference position signal slit that is attached to the shaft and rotates in synchronization with the shaft rotation, and an angle signal slit that is attached to the shaft and rotates in synchronization with the rotation of the shaft. It is composed of a main rotary plate 1 having a slit, and two photoelectric pickups (not shown) that generate and output a reference position signal and an angle signal using the main rotary plate 1. The rotary plate 1 shown in Fig. 1 has slits for arranging reference position signals and angle signals using two photoelectric pickups, and the slits for the reference position signals include a fuel reference slit 2 and an ignition timing reference slit. There are two types of slits: a slit 3 for angle signals, and a slit 4 for cylinder discrimination and a slit 5 for starting ignition.

FIG. 2 is a timing diagram of a signal pattern output from a photoelectric pickup by the rotating plate 1 of the rotation detector shown in FIG. In FIG. 2, 1a is a reference position signal, lb is an angle signal, 2a is a fuel reference signal of the reference position signal 1a, and 3
Similarly, a is the ignition reference signal, 4a is the cylinder discrimination signal of the angle signal 1b, and 5a is the starting ignition signal. The fuel reference signal 2a and the ignition reference signal 3a of the reference position signal 1a in FIG. 2 are output from the fuel reference slit 2 and the ignition timing reference slit 3 of the reference position signal slit in FIG. The discrimination signal 4a and the starting ignition signal 5a are respectively output from the cylinder discrimination slit 4 and the starting ignition slit 5 of the angle signal slit. The engine rotation speed is detected by measuring the period between the pulses of the fuel reference signal 2a and the ignition reference signal 3a of the reference position signal 1a, and the pulses of the fuel reference signal 2a and the ignition reference signal 3a of the reference position signal 1a are measured. The operation of the fuel injection control and ignition control programs are respectively started from the rising point of When the rising edges and rising edges of the pulse train of the cylinder discrimination signal 4a of the angle signal 1b are counted between the pulses of the reference signal 2a, the number of edges decreases by 1 from 6 to 1 for each cylinder. Because of this configuration, each cylinder can be discriminated based on the number of times it has been counted. Further, it outputs a regular ignition signal calculated based on the pulse of the ignition reference signal 3a of the reference position signal 1a, and at the time of starting or back-up, it switches to the pulse of the starting ignition signal 5a of the angle signal 1b as a fixed ignition signal. The ignition signal can be output and distributed to each cylinder based on the cylinder discrimination result.

Here, the slits of the rotary plate 1 shown in FIG. 1 for receiving the reference position signal 1a and the angle signal 1b shown in FIG.
Unlike the slit that obtains the reference position signal and angle signal described in No. 05548, there is no need to manage the pulse widths of the reference position signal 1a and angle signal 1b with high precision. In other words, in conventional rotation detectors, the angle signal is 1° in dist angle.
Since it was necessary to have a slit that outputs one pulse every time, the accuracy of the slit width and slit spacing was adjusted to ±
Since it is necessary to strictly control the angle of 0.25°, etching is used to create slits when machining the rotary plate, and also to prevent signal fluctuations caused by rotational fluctuations or battery voltage fluctuations. In order to suppress changes in pulse width and cycle as much as possible, the circuit that shapes the waveform of the signal obtained by the photoelectric pickup has become complicated, which has been a factor in increasing costs.

On the other hand, the accuracy of the pulse width or pulse period of the reference position signal 1a and the angle signal 1b obtained by the various slits 2 to 5 of the rotating plate 1 in FIG. 1 is, for example, ±4° (crank angle).
It is possible to make the slits as large as possible, and then there is no need to strictly control the accuracy of the various slits 2 to 5.
The manufacturing method of the rotary plate 1 can be changed from, for example, an etching method to a press punching method, and the waveform shaping circuit after picking up various signals can also be simplified, reducing the cost of the rotation detector and engine control device. becomes possible.

FIG. 3 is a block diagram of a cylinder discrimination circuit of an engine control device using the rotation detector of the rotating plate 1 shown in FIG. 1, showing an embodiment of the present invention. FIG. 4 is a timing diagram showing the circuit operation of FIG. 3. In FIGS. 3 and 4, 30 in FIG. 3 is a cylinder discrimination circuit, and 10 is a rising edge detecting circuit that detects the fall of the reference position signal 1a (FIG. 4) of the rotation detector in FIG. 1 and outputs a pulse. 11 is a rising detection circuit that also detects a rising edge and outputs a pulse; 12 is an OR circuit that ORs both signals; 13 is a cylinder that operates until the first rising or falling edge of the reference position signal 1a occurs at the time of starting. 14 is a rising detection circuit that detects the rising edge of the angle signal 1b (FIG. 4) of the rotation detector of FIG. 1 and outputs a pulse; 15 is a falling edge detecting circuit that also detects the falling edge Detection circuit, 16 is an OR circuit that takes the OR of both signals, 17
18 is an AND circuit that detects the rise and fall of the cylinder discrimination signal 4a included in the angle signal 1b while the pulse of the fuel reference signal 2a in the reference position signal 1a is generated; 18 is an output from the AND circuit 17; Cylinder detection that discriminates each cylinder by counting the rising and falling pulses of the cylinder discrimination signal 4a during the pulse period of the fuel reference signal 2a, and outputs cylinder signals 18a to 18f corresponding to each cylinder. A circuit 19 is an inverting circuit for inverting a reference cylinder signal 18a indicating a reference cylinder among the cylinder signals 18a to 18f. Angle signal 1b generated during the period
The number of rising and falling pulses of the cylinder discrimination signal 4a included in the fuel reference signal 2a, that is, the number of pulses of the edge signal 16a (FIG. 4) between the fuel reference signals 2a, differs depending on each cylinder. In order to discriminate one cylinder, the rise and fall of the cylinder discrimination signal 4a between the fuel reference signals 2a occur only six times, and the following second.
In order to discriminate between the 3, 4 and 5.6 cylinders, the signals are sequentially decreased by 1 and are generated only 5, 4, 3 and 2.1 times, and the cylinder detection circuit 18 detects this fuel reference signal 2a. Each cylinder is discriminated according to the number of rising and falling pulses of the cylinder discrimination signal 4a during the period, and cylinder signals 18a to 18f (FIG. 4) are output. For example, when the edge signal 16a is counted 6 times, the standard cylinder signal 18a is set to High, when counted 5 times, the 2-cylinder signal 18b is set to High, and later when the edge signal 16a is counted once, the 6-cylinder signal 18f is set to High.

If the reference cylinder signal 18a becomes High here, there is no need to count any more, so the cylinder detector circuit 18
In order to stop counting and prevent malfunction, the reference signal 18a is inverted by the inverting circuit 19 and the AND circuit 1
7, so that the counting of the cylinder discrimination circuit 18 can be stopped immediately after the reference cylinder is discriminated.

On the other hand, it is necessary to reset the cylinder detection circuit 18 and return the cylinder signals 18a to 18f to Low after the cylinder detection circuit 18 finishes discriminating each cylinder and before it starts discriminating the next cylinder. It is configured to be reset at the rising edge of the fuel reference signal 2a of the position signal 1a. Figure 3 2
0 is a combination of the reference position signal 1a and the edge signal 16a (FIG. 4) of the output of the OR circuit 16 in order to detect the rise and fall of the pulse of the cylinder discrimination signal 4a that occurs between the pulses of the fuel reference signal 2a. An AND circuit that performs AND; 22 is a rise detection circuit 1 that detects the rise of the reference position signal 1a;
A delay circuit that delays the rising signal 11a (FIG. 4) of the output of No. 1 by a predetermined time and outputs a pulse; 21 is the above AN;
This is a fuel reference signal detection circuit that sets the output to High using the output signal of the D circuit 20 and resets the output to Low using the output signal of the delay circuit 22. The fuel reference detection signal 21a (FIG. 4) output from the fuel reference signal detection circuit 21 becomes High when the angle signal 1b rises or falls while the reference position signal 1a is High, and becomes the next reference. At the rising edge of the position signal 1a, I becomes ow, that is, it becomes High from the middle of the pulse of the fuel reference signal 2a to after the rising edge of the ignition reference signal 3a. Reference numeral 23 in FIG. 3 indicates a reference position signal 1 based on the fuel reference detection signal 21a.
A pulse is output from the rising edge of the fuel reference signal 2a to the rising edge of the ignition reference signal 3a according to the rising edge signal 11a of
This flip-flop circuit outputs a reference signal 23a (fourth output) of the output (Q output) of this flip-flop circuit 23.
Figure) is a signal in which the rising edge of the pulse is used for fuel injection and the falling edge is used for ignition timing control. 24 is a rising edge detection circuit for detecting the rising edge of the reference signal 23a;
The reset signal 24a (
By resetting the cylinder detection circuit 18 at the rising edge of the pulse of the fuel reference signal 2a (FIG. 4), the pulse of each cylinder signal 18a to 18f (FIG. 4) is reset.

From the above, cylinder discrimination is possible.

However, at the time of starting, there may be a case where the fuel reference signal 2a of the reference position signal 1a starts to be generated in the middle of the pulse.
In this case, the number of rises and falls of the cylinder discrimination signal 4a of the angle signal 1b corresponding to the relevant cylinder may not be detected, which may cause malfunction. Therefore, it is preferable not to perform cylinder discrimination until a rising or falling edge of the reference position signal 1a occurs. Therefore, by providing a discrimination inhibiting circuit 13, a rising edge or a falling edge of the reference position signal 1a is detected by a rising edge detection circuit 11. Alternatively, cylinder discrimination by the cylinder detection circuit 18 is prohibited until the falling edge detection circuit 10 detects the fall. From the above, malfunctions at startup can be prevented. Further, since an ignition signal for starting and control (and for backup in the event of a PU failure) is required, the starting ignition signal 5a included in the angle signal 1b is used as the ignition signal for starting and backup. Third
25 in the figure is an AND circuit that ANDs the Q output of the flip-flop circuit 23, that is, the inverted signal of the reference signal 23a, and the angle signal 1b. is extracted as a fixed ignition signal 25a (FIG. 4). From the above, it is possible to obtain the ignition signal at the time of starting and backup.

Next, a control CPU (not shown) of the engine control device
First, by counting the pulse width time of the reference signal 23a of the cylinder discrimination circuit 30, the engine rotation speed N can be calculated. That is, the rising edge of the fuel reference signal 2a of the rotation detector reference position signal 1a in FIG. 2 is BTDC.
The rise of the ignition reference signal 3a at IIOo is BTDC50°
By setting the reference signal 23a to , the rising edge of the reference signal 23a is BTDCIIOo and the falling edge is BTDC50°.If the pulse width of the reference signal 23a in this case is T(see), the engine rotation speed N (rpn+) is given by the following equation. .

From N (rpm) = 10/T (see) or more, the engine rotation speed N can be detected by measuring the time from the rise of the reference position signal 1a to the rise of the ignition reference signal 3a, that is, the time of the pulse width of the reference signal 23a. .

Next, the fuel injection amount and ignition timing are calculated based on the engine speed N obtained above, and a fuel injection amount control signal and an ignition timing control signal are output, but the ignition signal is optimally determined based on the engine speed N. After calculating the ignition timing in terms of angle, the angle is converted into time according to the rotational speed N and output. At this time, if the data is not used to start ignition control immediately after detecting the engine speed N, there is a problem in that optimal ignition timing control cannot be performed when the engine speed N suddenly changes. By counting the time from the rise of the reference signal 3a to find the rotation speed N, and then using that data to set the time from the rise of the ignition reference signal 3a to the ignition timing, it is possible to deal with sudden changes in the engine rotation speed. becomes possible.

On the other hand, if the start point of fuel injection control is set to be the same as the start of ignition control, the program execution will be busy and there will be a delay in the start of ignition timing control, which may prevent optimal ignition control. It is effective to start the fuel injection control at a timing different from the start of the timing control, that is, the rise of the reference signal 23a is set as the start point of the fuel injection control that activates the fuel injection control program, and the rise of the reference signal 23a is The above-mentioned problem is solved by using the downward slope as the starting point for ignition timing control that activates the ignition timing control program. In addition, in engine control, rotational fluctuations are especially noticeable at the time of starting, and in this case, the engine rotational speed N becomes low at 100 to 300 rpm, so it takes a long time to measure the pulse width of the reference signal 23a to detect this low rotational speed. Become. Therefore, even if ignition timing is controlled using the data of this long pulse width measurement time, it is often impossible to ignite at the optimum position due to severe rotational fluctuations at the time of starting. Optimum ignition control is possible by using it during starting. Therefore, the starting ignition signal 5a included in the angle signal 1b is combined with the fixed ignition signal 25 which is the output of the AND circuit 25.
In place of the normal ignition signal that is calculated and output by the CPU based on the reference signal 23a during normal operation,
By outputting the fixed ignition signal 25a to the ignition coil at the time of starting.

It becomes possible to perform optimal ignition timing control even during startup. Also, in the case of a CPU failure, the reference signal 23a is
Since it is not possible to change the ignition signal that is calculated and output based on the ignition signal, by outputting the fixed ignition signal 25a to the ignition coil in place of the normal ignition signal, optimal ignition can be achieved even in the event of a CPU failure (abnormality). Switching of the ignition signal, which enables timing control, will be explained next.

FIG. 5 is a block diagram of an electronic power distribution circuit of an engine control device using the rotation detector of the rotating plate 1 of FIG. 1, showing an embodiment of the present invention. FIG. 6 is a timing diagram showing the operation of the electronic power distribution circuit up to the determination of the reference cylinder shown in FIG. FIG. 7 is a timing diagram showing the operation of the electronic power distribution circuit once the reference cylinder shown in FIG. 5 has been detected. First, in FIGS. 5 and 6, until the cylinder discrimination circuit 30 of FIG. 5 (FIG. 3) discriminates the reference cylinder at the time of starting, etc., each cylinder signal 18a=18f detected by the cylinder discrimination circuit 30 is Distribution will be made based on In other words, 31 to 36 in FIG. 5 are AND circuits, 37 to 42 are OR circuits, and 43 to 48 are AN
In the D circuit, the cylinder discrimination signal 18a from the cylinder discrimination circuit 30
~18f are input to AND circuits 43-48 via AND circuits 31-36 and OR circuits 37-42 of this electronic power distribution circuit. On the other hand, 49 is a switching circuit for switching the ignition signal at the time of starting, 50 is an OR circuit that ORs the signals for switching, 51 is a distribution circuit having a shift register configuration, 52
is a flip-flop circuit, in which the flip-flop circuit 52 outputs High until the distribution circuit 51 starts to operate, and after confirming that the 1-distribution circuit 51 has operated, the output is set to Lowν, and after that it maintains that state. do. On the other hand, the distribution circuit 51 receives the reference cylinder signal 18a from the cylinder discrimination circuit 30.
The operation starts when the normal ignition signal 49a or the fixed ignition signal 25a during starting is input as the ignition signal 49b via the switching circuit 49.
Until the operation starts, the output cylinder distribution signal 51a
~51f are all Low. Therefore, AND circuit 4
3 to 48, each cylinder signal 18a to 18f and ignition signal 49
By doing this, it is possible to distribute the ignition signal 49b to each cylinder. For example, the rotation detector reference position signal 1a (sixth
In the case of the first pulse shown in Fig. 2, the number of rises and falls of the pulse of the cylinder discrimination signal 4a of the angle signal 1b between the pulses of the fuel reference signal 2a is 5, indicating that it is the second cylinder. At this time, since the state of the two-cylinder signal 18b (FIG. 6) output from the cylinder discrimination circuit 30 changes from Low to High, this two-cylinder signal 18b passes through the AND circuit 32 and the OR circuit 38 and is input to the AND circuit 44. Then, A between the two cylinder signal 18b and the ignition signal 49b (Fig. 6)
By taking the ND, a signal having the same pulse width as the ignition signal 49b is output as the two-cylinder ignition signal 44a (FIG. 6). Subsequently, the other cylinders operate in the same manner, and the cylinder signals 18a to 18 corresponding to the reference position signal 1a and angle signal 1b are
It becomes possible to distribute the ignition signal 49b to each cylinder as cylinder ignition signals 43a to 48a based on the ignition signal f (FIG. 6).

5 and 7, after the cylinder discrimination circuit 30 of FIG. 5 once detects the reference cylinder, it is based on cylinder distribution signals 51a to 51f of a distribution circuit 51 different from the cylinder signals 18a to 18f. distribution.

That is, in the low rotation range where the period of the reference position signal 1a (FIG. 6) is long compared to the ignition signal 49b, distribution using only the cylinder signals 18a to 18f described above is possible; however, when the period of the reference position signal 1a (FIG. 6) is short Since the pulse width of the ignition signal 49b becomes relatively longer in the high rotation range, it is possible that the rise of the cylinder signals 18a to 18f occurs later than the rise of the ignition signal 49b. Cylinder signal 18a"1 with AND circuits 43 to 48
Ignition signal 49 in which the pulse width of each cylinder ignition signal 43a to 48a is normal when ANDing 8f and ignition signal 49b is performed.
There is a problem that the pulse width becomes shorter than the pulse width of b. This problem is solved by switching from the cylinder signals 18a to 18f to other distribution signals 51a to 51f after determining the reference cylinder, and then switching to the ignition signal 49.
This problem can be solved by using a method that distributes b. Therefore, when the reference cylinder signal 18a is generated from the cylinder discrimination circuit 30 for the first time,
The reference cylinder signal 18a is input as data to the distribution circuit 51, and the distribution circuit 51 starts operating when the ignition signal 49b is input as a clock. =18f to the cylinder distribution signals 51a to 51f output from the distribution circuit 51. As a switching method, the flip-flop circuit 52
The operation of the distribution circuit 51 is detected by the two-cylinder distribution signal 51b input from the distribution circuit 51, and the output is set to LOν.
This causes the outputs of AND circuits 31 to 36 to go low.
The cylinder signals 18a to 18f are fixed to the ignition signal 49.
It is prohibited to reflect it in the distribution of b. On the other hand, the distribution circuit 51
The cylinder distribution signals 51a to 51f output from the cylinders are input to AND circuits 43 to 48 via OR circuits 37 to 42,
In the AND circuits 43 to 48, the ignition signal 4 is
For example, in the case of the first pulse of the reference position signal 1a (FIG. 7), cylinder discrimination is performed using the angle signal 1b between the pulses of the fuel reference signal 2a. The number of rising and falling pulses of the signal 4a is 6 times, indicating that it is the first cylinder (reference cylinder), and at this time, the reference cylinder signal 18a (FIG. 7) output from the cylinder discrimination circuit 30 is generated. This reference cylinder signal 18a is input as data to the distribution circuit 51, and thereby the ignition signal 49b (FIG. 7) is used as a clock to generate two signals.
Data is sent to the cylinder distribution signal stb. Since this distribution circuit 51 is composed of a shift register,
- Once the reference cylinder signal 18a is input as data,
Using the ignition signal 49b as a clock, data is sequentially sent to each cylinder distribution signal 51a-51f, so that each cylinder distribution signal 51a-51f becomes as shown in FIG. Therefore, by using the ANDti-AND circuits 43 to 48 of the cylinder distribution signals 51a to 51f and the ignition signal 49b, the distribution of the ignition signal 49b to each cylinder becomes the same as each cylinder ignition signal 4.
3a to 48a (FIG. 7), it is possible to distribute the ignition signal 49b without malfunction even when the rotation is from 0 or more to high speed.

Next, referring to FIG. 5, the switching operation between the regular ignition signal 49a and the fixed ignition signal 25a at the time of starting, etc. will be explained. As mentioned above, the switching circuit 49 uses the normal reference signal 23a (the third
The OR circuit 50 is a switching circuit for switching between the reference ignition signal 49a calculated and outputted by the CPU based on FIG. 50a is a start signal indicating that it is time to start, and outputs High at the time of start; 50b is a backup signal indicating that the CPU that performs calculations detects a failure and shifts to backup; it outputs High at backup. Output. As a method for detecting failures (abnormalities) in this CPU, a patent application filed in 1986-14
There is a method of detecting this by counting the number of resets applied to the CPU, as described in No. 2366. ORing these start signal 50a and backup signal 50b
The signal taken by the circuit 50 is input to the switching circuit 49 as an ignition signal switching signal. The switching signal of the output of this OR circuit 50 is Low during normal times other than when starting or backing up, and the switch of the switching circuit 49 is connected to the a side, and the signal is calculated by the CPU based on the reference signal 23a. The normal ignition signal 49a is distributed to each cylinder as the ignition signal 49b according to the procedure described above. When one side starts or backs up, start signal 50
The output of the OR circuit 50 becomes High due to a or the backup signal 50b, the switch of the switching circuit 49 is switched to the b side, and the fixed ignition signal 25a based on the starting ignition signal 5a is used as the ignition signal 49b to perform the same procedure as described above. distributed to each cylinder. From the above, at the time of starting and backup, the starting ignition signal 5a in the angle signal 1b can be distributed to each cylinder as an ignition signal.

〔Effect of the invention〕

According to the present invention, by adopting a new signal pattern including two types of pulses or pulse trains for each of the reference position signal and angle signal obtained from the one-rotation detector, the configuration of the rotation detector and the circuit in the engine control device are improved. Since the configuration can be simplified, a low-cost system can be realized.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a rotary plate of a rotation detector showing an embodiment of the present invention, Fig. 2 is a timing diagram of the output signal of Fig. 1, and Fig. 3 is an engine control diagram showing an embodiment of the present invention. FIG. 4 is a block diagram of the cylinder discrimination circuit of the device, FIG. 4 is a timing diagram of the operation of FIG. 3, FIG. 5 is a block diagram of the electronic power distribution circuit of the engine control device showing one embodiment of the present invention, and FIG. FIG. 5 is a timing diagram of the operation up to the reference cylinder discrimination, and FIG. 7 is a timing diagram of the operation after the reference cylinder is detected in FIG. 1...Rotating plate, 2...Slit for fuel reference, 3...
・Slit for ignition timing reference, 4...Slit for cylinder discrimination. 5...Slit for ignition at the time of starting, 10...Falling detection circuit, ti...Rising detection circuit, 12...OR circuit, 13...Discrimination inhibition circuit, 14...Rising detection circuit, 15...Falling detection circuit, 16...OR circuit, 1
7...AND circuit, 18...Cylinder detection circuit, 19
... Inverting circuit, 20... AND circuit, 21... Fuel reference signal detection circuit, 22... Delay circuit, 23...
Flip-flop circuit, 24... rising detection circuit, 2
5...AND circuit, 30...Cylinder discrimination circuit, 31~
36...AND circuit, 37-42-OR circuit, 43-
48-A N D circuit, 49-... switching circuit, 50-
...OR circuit, 51...Distribution circuit, 52...Flip-flop circuit, 1a...Reference position signal, lb.
...Angle signal, 2a...Fuel reference signal, 3a...
Ignition reference signal, 4a... Cylinder discrimination signal, 5a...
Ignition signal at start. 11a...Rising signal, 16a...Edge signal, 1
8a... Reference cylinder signal, 18b-18f-2 to 6 cylinder signal, 21a... Fuel reference detection signal, 23a... Reference signal, 24a... Reset signal, 25a... Fixed ignition signal, 43a ~48a...1 to 6 cylinder ignition signal,
49a... regular ignition signal, 49b... ignition signal, 5
1a to 51f... 1 to 6 cylinder distribution signals. Fig. 1 Fig. 2 Fig. 3 Fig. 1 + Fig. Fixed Jiroku Theory Fig. 5 n

Claims (1)

[Claims] 1. A shaft that rotates in synchronization with the rotation of the crankshaft of an engine having multiple cylinders, and a rotation system that includes a reference position signal slit and an angle signal slit that rotate in synchronization with the rotation of the shaft. In a rotation detector equipped with a plate and a photoelectric pickup that generates and outputs a reference position signal and an angle signal using the rotary plate, after the piston of a certain cylinder reaches top dead center, the piston of the next cylinder moves upward. Until reaching the dead center, a reference position signal containing two types of pulses, a fuel injection reference pulse and an ignition timing reference pulse, and a pulse train for cylinder discrimination and an angle signal containing a pulse that can be switched to an ignition signal are transmitted. A rotation detector characterized in that it is configured to output. 2. An engine control device having the rotation detector according to claim 1, and calculating at least the fuel injection amount and ignition timing and outputting control signals thereof by inputting a group of signals output from the rotation detector. An engine control device characterized in that the engine rotation speed is detected by measuring the period between the fuel injection reference pulse and the ignition timing reference pulse of the reference position signal. 3. The engine control device according to claim 2, wherein the operation of the fuel injection control program is started from the time when the fuel injection reference pulse of the reference position signal is generated. 4. The engine control device according to claim 2, wherein the operation of the ignition control program is started from the time when the ignition timing reference pulse of the reference position signal is generated. 5. An engine control device having the rotation detector according to claim 1, which calculates at least the ignition timing and outputs its control signal by inputting a group of signals output from the rotation detector, when the engine is started. An engine control device characterized in that, instead of the ignition signal outputted as the control signal based on the above calculation, a pulse that can be switched to the ignition signal included in the angle signal is outputted as the ignition signal. 6. An engine control device having the rotation detector according to claim 1, and performing at least calculation of ignition timing and outputting a control signal thereof by inputting a group of signals outputted from the rotation detector, wherein the ignition timing is An engine control device characterized in that when a CPU which performs the calculation and outputs the control signal is out of order, a pulse which can be switched to the ignition signal included in the angle signal is output as an ignition signal in place of the control signal. 7. An engine control device having the rotation detector according to claim 1, and calculating at least the ignition timing and outputting the control signal thereof by inputting a group of signals output from the rotation detector, wherein the reference signal is The present invention is characterized by being provided with a cylinder discrimination circuit that discriminates each cylinder by counting the number of rises and falls of the pulse train for cylinder discrimination of the angle signal while the fuel injection control pulse is generated. Engine control device. 8. In the engine control device according to claim 7, each cylinder outputted from the cylinder discrimination circuit is detected until the reference cylinder signal is generated which discriminates the reference cylinder outputted from the cylinder discrimination circuit. An engine control device characterized in that an ignition signal is distributed to ignition coils provided in each cylinder based on a determined cylinder discrimination signal. 9. In the engine control device according to claim 7, once the reference cylinder signal outputted from the cylinder discrimination circuit is generated, the reference cylinder signal is shifted to each cylinder in place of the cylinder discrimination signal. An engine control device characterized in that an ignition signal is distributed to ignition coils of each cylinder by distribution. 10. The engine control device according to claim 7, characterized in that, at the time of starting the engine, discrimination of each cylinder is prohibited until the rise or fall of the first pulse of the reference position signal is detected. Engine control device.