JPH03220041A - Electronic controller for placement on vehicle - Google Patents

Abstract

PURPOSE:To see that a backup mode is supported by another normal ECU when trouble has occurred in the control system of one ECU by equipping ECUs with serial bus I/F circuits so that the data transmission and reception between plural ECUs may be done. CONSTITUTION:In the ECU 1 for engine control and the ECU 2 for transmission control, a serial bus I/F circuit 5 is annexed to each, and fellow I/F circuits 5 are connected by a transmission path. Moreover, data transmission is made possible by incorporating software, which converts the information that the sensor of one ECU has gone wrong and it is operating in backup mode into digital signal information and transmits it to the other ECU using a serial communication means, in a memory 2. Software, which performs the control corresponding to the abnormality of the other ECU, is incorporated in the memory on the side of ECU which receives the abnormality signal, whereby the support operation to the ECU in backup operation becomes possible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to hack-up control of various electronic control bags W (hereinafter simply referred to as ECU) mounted on a vehicle.

[Conventional technology]

FIG. 4 shows a block diagram of a conventional ECU control system. This control system includes various sensors 11, 12. The CPLI 1 processes the data input from the CPLI 1 according to the procedure of the program stored in the memory 2 of the ECU to drive various actuators 21, 22.2n.For example, if one of the sensors breaks down, the memory Security is maintained according to the backup procedures stored in 2.

Next, the operation of the ECU will be explained based on the flowchart shown in FIG.

First, after starting and initializing all (controllers) in the ECU in step SL, data of various sensors 11-in are inputted via input 1/F3 in step S2, and then, in step S3, sensor abnormality is detected. If each sensor is determined to be normal, data processing during normal operation is performed in step S4a, and various actuators 21 to 2n are driven in step S5.On the other hand, if it is determined that the sensor is abnormal in step S3, data processing during normal operation is performed in step S4b. For example, if sensor 11 is judged to be abnormal, the data of sensor 11 is estimated based on the information from other sensors 12 to In, or the data is fixed at a predetermined value. After processing, the actuators 21 to 2n are driven in step S5.

[Problem to be solved by the invention]

Since the conventional ECU control system is configured as described above, data processing in hack-up mode is performed by each ECU.
In a car equipped with multiple ECUs, even if one ECU is operating in hack-up mode, the other ECUs cannot recognize it. It was difficult to perform optimization control as a total system under the amplifier conditions.

This invention was made to solve the above-mentioned problems.In a car equipped with multiple ECUs, other ECUs can recognize the BCtJ operating in bank-up mode, and the other ECUs can The object of the present invention is to obtain an on-vehicle electronic control device that enables control compatible with hack-up mode.

[Means to solve the problem]

In the vehicle electronic control device according to the present invention, various electronic control devices installed in a vehicle encode input signals from various sensors and output signals for driving actuators to be controlled, and transmit the signals between the electronic control devices. In an in-vehicle electronic control device that transmits data using serial communication means,
The present invention is characterized in that the electronic control device is equipped with a serial bus I/F circuit, so that data can be sent and received between the electronic control devices 4T5 in the event of a failure of the various sensors and actuators.

[For production]

In this invention, the serial bus I/F circuit is
By commonly connecting to U, information that one ECU is operating in backup mode can be transmitted to other ECUs as information.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows a flowchart of the control system of the in-vehicle ECU according to the present invention. This invention adds a serial T/F circuit 5 to each conventional ECLJ, and The F circuit 5 is connected to the transmission line 6, and serial communication data can be transmitted to each other.

The ECU configured as described above has a serial communication means, and the specific contents of the serial communication data and the data processing method depend on software. Therefore, the memory 2 includes software that converts information that the sensor 1n of one ECU is malfunctioning and is operating in backup mode into digital signal information and transmits it to other ECUs using serial communication means. This allows data transmission. In addition, on the ECU side that receives the abnormality signal, by incorporating software into the memory 2 to perform control in response to abnormalities in other ECUs, it is possible to perform support operations for the ECU during backup operation and to control the entire system. Operation becomes possible.

Next, the operation of the ECU will be explained using the configuration shown in FIG. 2 as an example. Sensor 2 of engine control ECU 1 (101)
01 has become abnormal and the engine speed is unstable, and transmission control ECU 2
It is assumed that (102) is operating normally.

Figure 3 shows E CU 1 (101) and E CU 2
(102) is a flowchart showing control. First, ECU1 (101) starts at step Sl.
After initializing all the values in E CUl (101) in step S12, the data of various sensors 201 is inputted in step S12, and in step S13, the sensor abnormality is converted into a digital code and sent to the transmission line 6. . In step S14, data processing is performed in the hack-up mode when a sensor abnormality occurs, and in step S15
The various actuators 202 are driven.

E CU 2 (102) is in step S after the start.
After initializing all values in E CU 2 (102) in step S22, the data of various sensors 203 are manually inputted in step S22, and in step S23 it is detected that the sensor 201 of E CU ] (101) is abnormal. 6, and in step S24, the sensor 201 of the E CU 1 (101) is abnormal and the engine speed is unstable, so the shift timing and gear position are adjusted. In this way, in this invention, the normal control system E CU 2
(102) is in an abnormal state ECU 1 of the control system
(101) can support backup control.

In addition, in the embodiment, the case where the sensor 201 becomes abnormal has been explained, but the sensor 201 and the ECU1 (101)
The abnormality may be due to a disconnection or short circuit of the wire 205 connecting the actuator 202 or the abnormality may be due to a disconnection or short circuit of the line 206 connecting the actuator 202 and the E CIJ I (101). Effects similar to those described above can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, the ECtl is equipped with a real estate I/F circuit to enable data transmission and reception between multiple ECUs, so if a failure occurs in the control system of one ECU, the control system is controlled in backup mode. Other normal ECUs can support Hack 7 Knob mode when maintaining the
This enables token system-like optimization control.

4. Brief explanation of IID side No. 1M is a block diagram of a control system of an in-vehicle ECU according to an embodiment of the present invention, FIG. 2 is a block diagram of an ECU control system for explaining specific operations, and FIG. 3 4 is a flowchart for explaining the invention in detail, and FIG.
FIG. 5, a block diagram of the U control system, is a flowchart for explaining the operation of a conventional ECU.

l...CPU, 2...memory, 3...human power! /F
, 4... Output 1/F, 5... Serial bus I/F circuit, 6... Transmission line, 11-1n, 31-3n... Sensor, 21-2n, 41-4n... actuator.

Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] In-vehicle use in which various electronic control units installed in the vehicle encode input signals from various sensors and output signals that drive actuators to be controlled, and transmit the data between the electronic control units using serial communication means. An in-vehicle electronic control device, characterized in that the electronic control device is equipped with a serial bus I/F circuit, so that data can be sent and received between the electronic control devices in the event of a failure of the various sensors and actuators. electronic control unit.