JP2804031B2 - Engine control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to an engine control device, and more particularly, to a function of inspecting or self-diagnosing a control device itself or a system in which the control device is incorporated, or a system control device. The present invention relates to an engine control device having a function suitable for ching. [Prior Art] In a conventional engine control device, for example,
As disclosed in JP-A-8-8238, the output is controlled by a program for controlling the operating state of the engine.
It is only determined based on an input signal indicating the operating state of the engine or the vehicle. Also, when a secondary program (for example, a self-diagnosis program) that is not intended to control the operating state of the engine is provided, the output of the engine control device can be obtained only by the secondary program incorporated in advance. It is merely controlled to the determined state or the state determined by the secondary program based on the state of the input signal. [Problems to be Solved by the Invention] In the above-mentioned prior art, the output state of the engine control device is uniquely determined based on an input state indicating the operation state of the engine or the vehicle by a control program incorporated in advance. Therefore, in order to set the output of the engine control device to a predetermined state, it is necessary to realize a predetermined input state according to the control program. For example, if a delay time element is programmed in the process of reaching the desired output state in the control program, it is necessary to wait for the delay time to realize the desired output state, and However, when a control program is installed so as to operate only in a transient state of a certain input, the output state cannot be constantly maintained. Therefore, in order to check the hardware of the output unit of the engine control device, it is necessary to be familiar with the software (control program) incorporated therein. In addition, the check includes the delay time as described above. For this reason, there have been problems such as that it takes a long time, and that an accurate output state cannot be checked due to a transient state. In addition, in a process such as matching of a system under product development, in order to change an output state corresponding to a predetermined input state, it is usually necessary to rewrite a control program or data written in an EPROM. It was a time-consuming operation. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide an engine control device capable of easily checking hardware and matching control. [Means for Solving the Problems] In an engine control device having input means for inputting a signal indicating an operating state of an engine or a vehicle, and output means for outputting an actuator drive signal based on the input signal, The first output via the input means
Normal mode control means for performing arithmetic processing for controlling the engine or the vehicle based on the output signal of
An output unit that forms a drive signal necessary for driving the actuator based on a second output signal that is a calculation result of the normal mode control unit, and exchanges data with an external device different from the engine control device. Communication means for performing, a check mode control means for checking or matching the engine control device based on data from the external device received in a storage element in the engine control device via the communication means, Mode switching means for switching between the mode control means and the check mode control means, wherein when the mode is switched to the check mode control means, the communication is performed in place of the first output signal or the second output signal. The above problem is solved by an engine control device characterized by using data from an external device obtained via the means. [Operation] The operation will be described with reference to FIG. The input means 20 receives an input signal 21 indicating the operating state of the engine or the vehicle and outputs an output signal 22 to the normal mode control means 30. The normal mode control means 30 drives the actuator 110 based on the output signal 22. The output is determined and output, and the output means 40 outputs an actuator drive signal 41 corresponding to the drive output to the actuator 110. On the other hand, data 5 is transmitted from the external device 100 through the communication means 50.
1, the check mode control means 60 determines and outputs the drive output of the actuator 110 based on the data, and the output means 40 sends the actuator drive signal 41 corresponding to the drive output to the actuator 110 in the same manner as described above. Output. The mode switching means 70 switches the control means from one of the normal mode control means 30 or the check mode control means 60 to the other based on the output signal 22 and the data 51. When the mode is switched to the check mode control means 60, the normal mode control means 30, the check mode control means 60 or the output means 4 is transmitted from the external device 100 via the communication means 50.
The data stored in the normal mode control means 30, the check mode control means 60, and the data stored in the output means 40 can be transmitted to the external device 100. Embodiment An embodiment of the present invention will be described below with reference to FIGS. FIG. 2 is a diagram showing an engine control device 1 of the present invention, a state in which a check device 6 is connected to an input side of the engine device 1, and an actuator of the engine is connected to an output side thereof. The engine control device 1 stores a program.
ROM2, RAM3 for storing, reading and writing various kinds of data, and ROM3 for executing programs stored in ROM2.
CPU 4 that performs various calculations using the data stored in the
An input / output device (I / O) 5 for outputting various signals according to the result of the U4 operation. Each of the normal mode control means and the check mode control means in FIG.
The control program of each control means is written in ROM2, the signals and data used by each control means are stored in RAM3, and the drive output of the actuator by each control means is calculated by CPU4. It will be decided. The I / O 5 also reads various input signals (engine parameters) necessary for engine control. For example, the second
When the control device 1 is connected to the check device 6 as shown in the figure, the I / O 5 outputs the rotation signals 7a, 7a, which are generated from the rotation signal generator 7 in the check device 6 as engine parameters.
The intake air amount signal 8a from the intake air amount pseudo signal generator 8 and the switch signal from the start switch 9 are read. The data of such a read signal is stored in the RAM 3 and read out from the RAM 3, and the CPU 4 performs a calculation based on the data. A control signal for controlling the timing is output from the CPU 4 through the I / O 5. The above steps correspond to those performed by the normal check mode control means shown in FIG. Further, the CPU 4 is provided with a serial communication function (corresponding to the communication means in FIG. 1), and communicates with the data transmitting / receiving device 13 (corresponding to the external device in FIG. 1) provided in the check device 6. It is connected. First, the CPU 4 reads a switch signal 10a from the check switch 10 indicating the start of serial communication in the check device. The contents of the communication data by the serial communication function are an address, the contents of the address, and the check data (sum, parity, etc.). Any data can be written to the RAM, and conversely, various data in the RAM 3 can be sent back to the transmission / reception device 13 by specifying an address, and the reading state of the input signal and the data can be checked. Further, when receiving predetermined data (keyword) from the transmitting / receiving device 13 via the serial communication function, the CPU 4 switches from the normal mode control to the check mode control or vice versa. In the check mode control, the output state is determined using one or more pieces of received data. For example, instead of the water temperature data obtained from the water temperature sensor, the data received via the communication function is regarded as the water temperature and the calculation is performed, or the predetermined data is directly written to the output control register. The engine parameters operate irrespective of achieving an arbitrary output state. As described above, by realizing an arbitrary output state or monitoring the operation state irrespective of the engine parameters via the communication function, it is possible to shorten the check time, Since the output state can be stabilized and viewed accurately, it is possible to easily check the hardware of the engine control device and match the control. FIG. 3 is a timing chart showing the operation of serial communication. Considering the case of transmission from the transmission / reception device 13 to the CPU 4, first, a clock signal 13a, which is a basic clock for data transfer, is output from the transmission / reception device 13 at a constant period. A transmission signal 13b, which is transmission data, is output from the transmission / reception device 13 in synchronization with the clock 13a. In this case, as the transmission data, 8-bit data is output after a start bit of "0", and a stop bit of "1" is finally output. The CPU 4 reads data at the rising edge of the clock signal 13a, and when detecting a start bit of "0", reads data from the next bit by 8 bits. Thereafter, the stop bit of “1” is read to detect the end of the data. The transmission from the transmission / reception device 13 to the CPU is performed as described above, and the transmission from the CPU 4 to the transmission / reception device 13 is performed in the same manner. FIG. 4 is a general flow chart of the present invention;
According to the task scheduler OCi, it is shown that data is interrupted every 20 msec for engine ignition timing control and every 40 msec for air-fuel ratio (A / F) control and serial communication control. FIG. 5 is a diagram showing a flow chart for executing the serial communication function, in which data is received in steps 14 to 20, and data is transmitted in steps 21 to 27. As shown in the lower part of FIG. 5, the received data consists of a command, an address upper address, an address lower address, data and a check byte of 5 bytes (reception count R
COUNT0 to COUNT4), and the transmission data consists of 4 bits of upper address, lower address, data and check byte.
This serial communication is performed using the serial communication function of the CPU 4. The flowchart for receiving data will be described below. Step 14: Confirmation of reception permission, Step 15: Read the contents of the reception data register RDR and store it in the address of (reception count R COUNT) + (reception data buffer #RDBUF). Step 16 ... R
COUNT is incremented by one, step 17 ... RCOUNT = 4, if not COUNT = 4, go to step 14 when R COUNT = 4, that is, read the received data, step 18 ... R
Clear COUNT, step 19 ... Transfer the received data from the buffer to a predetermined address in the memory (RAM3). In the data transmission, the contents of the address of the memory (RAM3) to be transmitted are once set to the transmission data address (until T COUNT = 3), and then transmitted. FIG. 6 is a flowchart showing the output check mode (in FIG. 6, described as a special output mode). Specifically, the output check mode (1) will be described. The calculation and setting of the ignition timing is performed by a task every 20 msec. Now, in the case of the normal mode, the basic amount of the ignition timing is determined in step 31 based on the rotational speed of the engine and the intake pipe pressure, and further corrected by other information indicating the operating state of the engine to determine the final output value. Is done. The ignition timing obtained as a result of the calculation is written in a predetermined ignition timing register of the I / O 5 in step 33, and the ignition timing is output. If it is now in the output check mode, the program branches at step 30 to execute steps 32-33. That is, the value (predetermined data for the ignition timing check) of the predetermined address of the RAM 3 is read out and written into the ignition timing register of the I / O 5. Since this value can be written in advance using a serial communication function, if this value is used, any value can be used regardless of the engine speed and other input parameters, or the program specifications in the normal mode. Can also be output. In the air-fuel ratio (A / F) control shown in the output check mode (2), any output can be output in the same manner as described above. 7 to 9 show a series of flowcharts for switching between the normal mode and the output check mode. The transition from the normal mode to the output check mode is input from the transmission / reception device 13 via the communication function of the CPU 4.
O ₂ is done Te cowpea to the input and the keyword of the sensor. With respect to the input of the O ₂ sensor, the O ₂
Check if sensor input ≥ 3V is input,
When output is made, a flag indicating the special output mode setting is set. The reason that the condition of the O ₂ sensor is 3 V or more is set in order to minimize the possibility of erroneously shifting to the output check mode during normal bicycle running.
Incidentally, since the O ₂ sensor normally outputs only a voltage of 0 to 1 V, a voltage of 3 V is considered to be realized only by a test apparatus. A similar idea is to use the keyword. After checking the O ₂ sensor, the WRIT
After the check for the reception of the E command is performed, the check of the keyword is executed in step 40. This keyword is considered to be satisfied when specific data is received and stored at a specific address of the RAM 3. If the keyword is not satisfied, and checks the flag of the O ₂ sensors checkstop earlier in step 41, step 40 and step
41 only if both the establishment of flags and keywords special mode by the O ₂ sensor has been confirmed and sets the flag to allow the output Chietsukumodo at step 42.
By setting this flag, the check mode can be controlled. If either the special mode flag or the keyword is not satisfied, the output check mode is prohibited in step 43 and the flag is cleared. At step 30 in FIG. 5, the program flow branches depending on the presence or absence of this flag. The embodiment of the present invention has been described above. However, the same can be applied to various outputs other than the ignition timing. It is obvious that the mode can be switched by using only the keyword or a combination with another input. In this embodiment, the method of directly specifying the ignition timing has been described. For example, a method may be used in which data received by serial communication is used as engine speed data, and the subsequent calculation routine is common to the normal mode. It is. [Effects of the Invention] The present invention is configured as described above, in particular, a communication means for exchanging data with an external device, and a drive output of the actuator is determined based on data received via the communication means. By providing a check mode control means to realize an output state arbitrarily regardless of the signal indicating the operation state of the engine or the vehicle, or to monitor the output state, it is possible to reduce the check time, Since the output state can be stabilized and viewed accurately, there is an effect that checking of hardware of the engine control device and matching of control can be easily performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram corresponding to claims of the present invention, FIG. 2 is a block diagram of one embodiment of the present invention, FIG. 3 is a timing diagram of serial communication, FIG. 4 is a general diagram of the present invention. FIG. 5 is a flow chart for executing serial communication, FIG. 6 is a flow chart for an output check mode, and FIGS. 7 to 9 are flow charts for switching between a normal mode and an output check mode. DESCRIPTION OF SYMBOLS 1 ... Engine control apparatus, 20 ... Input means, 21 ... Input signal, 30 ... Normal mode control means, 40 ... Output means, 41
…… Drive output, 50 …… Communication means, 51 …… Data, 60 ……
Check mode control means, 70 mode switching means, 10
0: External equipment, 110: Actuator.

   ────────────────────────────────────────────────── ─── Continuation of front page    (72) Inventor Chu               3085 No. Higashiishikawa Nishikonai, Katsuta, Ibaraki Prefecture               5 Hitachi Automotive Engineer               Incorporated                (56) References JP-A-56-6134 (JP, A)                 JP-A-62-157256 (JP, A)

Claims (1)

(57) [Claims] In an engine control apparatus having an input means for inputting a signal indicating an operation state of an engine or a vehicle and an output means for outputting an actuator drive signal based on the input signal, a first signal output through the input means is provided. A normal mode control means for performing an arithmetic process for controlling the engine or the vehicle based on the output signal of the actuator; and driving the actuator based on a second output signal which is a calculation result of the normal mode control means. An output unit for forming a drive signal necessary for the communication, a communication unit for transmitting and receiving data to and from an external device different from the engine control device, and the communication unit receiving the data to a storage element in the engine control device via the communication unit. Check mode control means for checking or matching the engine control device based on data from an external device, A mode switching unit that switches between the normal mode control unit and the check mode control unit, and when the mode is switched to the check mode control unit, instead of the first output signal or the second output signal, An engine control device using data from an external device obtained through the communication means.