JPS5932649A - Method of resetting electronic control apparatus for internal combustion engine - Google Patents

Abstract

PURPOSE:To enable to reset the operational condition in a simple, prompt and reliable manner at the time when malfunctioning is caused, by producing a supervising signal at each period in synchronism with a top dead point signal, and judging that some trouble is caused with a control apparatus when the level of the supervising signal is not equal to that of the signal at the same time point of the previous period. CONSTITUTION:When malfunctioning of an electronic control circuit 1 is caused through uncontrollable operation of program, a signal S4 is not poduced normally and a supervising signal is not inverted, so that the level of a supervising signal S3 becomes equal to that of a supervising signal S5 during the while when a top dead point signal S1 is produced. Under such circumstances, a trouble supervising circuit 6 judges that some trouble is caused with the circuit 1 and the circuit 6 furnishes a reset signal S6 for restarting of the control apparatus from its terminal 6c to the control circuit 1 so as to lower the level of the signal S5 along with falling of the level of the reset signal S6. Resultantly, the control circuit 1 is reset by the reset signal S6 and the level of the supervising signal S3 becomes low. Subsequently, the level of the supervising signal S3 becomes high after executing initial processing, and then the control apparatus is operated on the basis of the top dead point signal S1, thus cmpleting resetting of the control circuit with ease.

Description

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, when the electronic control side 1 device malfunctions (-M-), it is possible to easily recover from this state by controlling the fuel injection, etc. of the internal combustion engine.
7. ,) 5. 1. Concerning the electronic control unit reset force method of the I-muni internal combustion engine 1゜Conventional, i) i, it There is an electronic control device that requires a computer.3. Such an electronic control device is equipped with an initial reset circuit, and when the power is turned on, the initial reset circuit operates and resets the entire device. Initialization [7. Built-in programs are configured to be executed sequentially from a predetermined start address and perform predetermined control operations).

However, for some reason, a malfunction such as a program malfunction occurs in the microcomputer.41. Su4n and
The predetermined control operation cannot be performed, and in this case, the device j (IJ set l-1, etc.
It is definitely inconvenient.

Conventionally, as a method for solving the above-mentioned problem, a method using a watchdog timer circuit is already known. This method (Jl, ; fj'l III) There is a method (゛) in which the control device is reset when the watchdog timer times up when the device is abnormal. According to this method, the control device outputs only when it is normal IIE 'Err of operation at t based on the periodic pulse signal J-
Since the structure is designed to make it easy to judge abnormalities,
ill1Δ1) It requires a program to generate the above-mentioned periodic pulses at the beginning of the operation, and therefore has the disadvantage that the program becomes complicated.

The present invention has been made in view of the above problems and to effectively solve them.

One object of the present invention is to utilize the ten dead center signal to:
When the electronic control device of an internal combustion engine that performs tll ink malfunctions, it can be quickly and reliably controlled by a simple method.
An object of the present invention is to provide a method for re-centering an electronic control unit of an internal combustion engine so as to reset the CC operating state.

Therefore, the feature of the present invention is that, in order to achieve the above-mentioned object, the earth is synchronized with the signal B related to the control processing.
! A monitoring signal whose level is reversed every cycle is generated.
Based on the coincidence or mismatch between the level of the monitoring signal at the time point - of the cycle consisting of the above and the level of the monitoring signal at the same time point in the previous cycle, it is determined whether the electronic control unit is normal or abnormal. Nia7).

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the circuit configuration of an electronic control device according to the present invention, and FIG. 2 is a main chart 1 showing the waveforms of signals at each part of the engine.

1 is an electric r-control circuit with a built-in microcomputer, and the electronic control circuit 1 is an internal combustion engine! /i″,”4
・For example, control the fuel injection device 2, etc., and vice versa! It has functions to control fuel injection, etc. by changing the information.

This control is carried out by the data sent from the electronic control circuit 1 written in the electronic control circuit 1, the data and the data sent from the target controlled device, and performs the normal normal control of the IL. During operation, control is performed according to a series of control programs.

The electronic control circuit 1V'c inputs the ten dead center sign s1 shaped by the top dead center detection sensor 3 via the waveform shaping circuit 4 to the terminal 1a, and at the same time, a power switch (not shown) is turned on. When the power supply voltage -1-Vcc is applied, the initial reset circuit 5 operates and outputs the reset signal S2 to the terminal 1d.
is done manually 4).

-I', dead center number s1 is a pulse signal that is output in synchronization with the rotational speed as shown in Fig. 2 (3) that occurs after the engine starts, and reset l- (E number s2 occurs at the same time as the power is turned on (Figure 2 (1)) and lasts for a certain period of time7
,, ) is a pulse signal ((2) in FIG. 2).

The electronic control circuit 1 is powered on and receives a reset signal s2.
After inputting, initial processing such as clearing the RAM is performed, and the monitoring signal s3, which is in a high level state as shown in (5) below, is output from the terminal 1b.3) This monitoring signal s3 synchronizes with the falling green of the dead center signal s1 (2) synchronizes with a predetermined !fi control process such as fuel injection in the electronic control circuit 1, and generates a signal s4'Q representing the start of the f process execution. 4) occurs periodically, but its level is successively inverted by the falling edge of this signal s4.3. Therefore, while the electronic control circuit 1 is normally performing control operations based on the program, the signal s4 is also generated normally.
Therefore, the 18ζ1 visual signal s3 repeats the inversion of high and low levels (Fig. 2 (5)), and this! 2. The operating status within the electronic control circuit 1 can be monitored.

Ichiriki, there is a separate error in electronic control circuit 1; ;1 congratulatory circuit 6
be established. The abnormality monitoring circuit 6 has a top dead center signal S, which is shaped at the end 5a & 5a, and a reset signal s at the terminal 6d.
2 is input, and the input signal s3 is input to the terminal A 6b.3 With such a configuration, after the entire circuit is set by the reset signal 'i'is2, It was input to the internal memory circuit at that time in synchronization with the falling edge of the dead center signal S! ! ij, congratulations (M issue S3Y sampling and memory retention,
Furthermore, while the point signal sI remains and the high level is maintained, the level of the monitoring signal input to the terminal 6b and the stored signal S5 (FIG. 2 (6)
)'s level and restarts only when the level is the same, y)'s reset Shinkyu S6 (Figure 2 (7))
is outputted from the terminal 6c and sent to the terminal 1c of the control circuit 1.

As shown above, the internal combustion engine ε (for 20 hours while the child control circuit 1, which controls fuel injection, etc.), is operating normally, as shown at times t1, t2, etc. dead center signal s
, the level of the signal s5 stored in the homologous path 6 does not necessarily match the level of the signal s5, which is maintained in the homologous circuit 6. Based on this, the abnormality monitoring circuit 6 detects an abnormality in the electronic control circuit 1. The condition is normal and 4) f'lJ should be disconnected.

Also, if the program overloads and the electronic control circuit 1 becomes )-', the signal S4 will not be generated normally (541 in Figure 2).
, as a result, the demand 1 vision sign does not reverse, so for example, at time t
3, while the upper point signal sl remains j4),
The levels of the monitoring signal S3 and the signal s5 match, and as a result, the abnormality monitoring circuit 6 detects that the electronic control circuit 1
It is possible to determine the abnormality of the abnormal condition.
The parent circuit 6 is the terminal 6c! Send the reset signal 56 for starting 7JJ to the fill jn11 circuit 1, and set the state of the signal s5 to a low level in response to the rising edge of this signal s6. The electronic control unit 1 is reset by the reset signal s6, and the supervisory signal S3 becomes low level 31-. Thereafter, after the initial processing is performed, the control signal S3 goes to a high level, and from then on, the previous Q+ operation is performed according to the L point signal S1.

As is clear from the above description, according to the present invention, when control processing is performed in synchronization with a top dead center signal in an electronic control circuit of an internal combustion engine, a monitoring signal that is inverted in synchronization with each processing is transmitted. Based on this, it determines whether it is normal or abnormal and restarts (-!: Because it is set to 5, there is no need to turn on the power, and it is easy to do 1-1. Reliably restart at the appropriate time. In particular, the control program itself is simplified and is shorter than the conventional one.Also, since the monitoring signal is sampled in synchronization with the 10th dead center signal, the computer will not run out of control. While the reset I signal is being applied, the backup circuit V can be switched on in devices with a backup circuit, and the processing can be supplemented by switching to the L signal in synchronization with the top dead center signal. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the circuit configuration of an electronic control device according to the present invention, and FIG. 2 is a time chart showing the waveform 7 of the @species signal in the first apposition name part. 1.Electronic control circuit, 2.Fuel injection device, 3'-dead center detection sensor, 6..abnormality monitoring device, sI.-1=, dead center believe, s3..monitoring signal, S4..control processing signals related to, s5: stored congratulatory signal, s6: reset signal. Applicant: Oki Electric Industry Co., Ltd. Representative Patent Attorney F 1) Sales Department 293

Claims (1)

[Claims] Electronics of the internal combustion engine: (The ij control device generates a signal whose level is inverted every cycle in synchronization with the aj control process performed at the top dead center signal, and - Compare the level of the above-mentioned signal at the time of Saturday evening Tenshin-yumi for each bow with the level of the month recorded one week before, and then control the above-mentioned electronic control when people's tovel is 1 stroke. To cause the device to generate a circular activation u L +'Q 6 reset signal (
(~1) A method for installing an E-control device for an internal combustion engine with two key features.