JP2018161904A - Electronic control device for vehicle, and port setting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an equipment configuration depending on a vehicle type from being uncontrollable when an abnormality occurs in identification data unique to the equipment configuration.SOLUTION: An electronic control device for a vehicle includes a nonvolatile memory storing identification data unique to an equipment configuration depending on a vehicle type, an abnormality detection unit detecting whether an abnormality in the identification data is present or absent, a first setting unit that sets, when the identification data is normal, the I/O state of a port as an I/O state corresponding to the identification data in plural specifications, and a second setting unit that sets, when the identification data is abnormal, the I/O state of the port as one I/O state (the latest version) for an abnormal state of the identification data, which is specified out of the plural specifications.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicular electronic control device and a port setting method, and more particularly to a technology for setting an input / output state of a port based on identification data unique to a device configuration corresponding to a vehicle type.

  The vehicle electronic control device disclosed in Patent Document 1 includes hardware identification data stored in the ROM and hardware identification data stored in the first storage means in the initialization process immediately after power-on. And the checksum data of the area in the ROM where the control program is written are compared with the checksum data stored in the ROM. If the data matches, set the I / O port.

JP 2013-220964 A

  By the way, in the vehicle electronic control device, when an abnormality occurs in identification data unique to the device configuration corresponding to the vehicle type, it is determined that selection from a plurality of port input / output states is impossible, and port input / output When the state is set to the default state, the control operation cannot be performed, and the traveling performance of the vehicle may be deteriorated.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicular electronic control device and a port setting method that can prevent control from being disabled when an abnormality occurs in identification data.

  According to the present invention, in one aspect thereof, when the identification data is normal, an input / output state of the port is set to an input / output state corresponding to the identification data in a plurality of specifications, and the identification data is When there is an abnormality, the input / output state of the port is set to the input / output state for when the identification data is abnormal defined in one of the plurality of specifications.

  According to the said invention, it can suppress that it becomes uncontrollable even if abnormality arises in identification data.

It is a block diagram which shows the control system in embodiment of this invention. It is a flowchart which shows the initial setting process of the port in embodiment of this invention. It is a figure for demonstrating the example which performs abnormality detection of identification data using the inversion value in embodiment of this invention. It is a figure for demonstrating the example which performs abnormality detection of identification data using the error detection code in embodiment of this invention. It is a figure which illustrates the transition of the apparatus structure and control software in embodiment of this invention.

Embodiments of the present invention will be described below.
FIG. 1 is a block diagram showing a control system 100 for a vehicle internal combustion engine. The control system 100 includes an ECM 200 (Engine Control Module) as a main control unit and a VTC controller 300 as a sub control unit. The
The VTC controller 300 is an aspect of the vehicle electronic control device according to the present invention, and is an aspect of the vehicle electronic control device to which the port setting method according to the present invention is applied.

The ECM 200 is an electronic control unit that controls actuators such as a fuel injection valve and an electric throttle valve that are provided in a vehicle internal combustion engine (not shown).
The ECM 200 communicates via a microcomputer 210 including a CPU (Central Processing Unit) 211, a ROM (Read Only Memory) 212, a RAM (Random Access Memory) 213, etc., a VTC controller 300 and a CAN (Controller Area Network) 400. The CAN communication circuit 220 is provided.

The VTC controller 300 is an electronic control device that controls a motor 510 that is a power source of a valve timing control system 500 that is an actuator provided in an internal combustion engine for a vehicle.
The valve timing control system 500 continuously changes the valve timing of the engine valve (intake / exhaust valve) by continuously changing the rotational phase of the camshaft with respect to the crankshaft of the vehicle internal combustion engine by the motor 510. This is a valve timing control system of the type.

  The VTC controller 300 includes a microcomputer 310 including a CPU 311, a ROM 312, a RAM 313, an EEPROM (Electrically Erasable Programmable Read-Only Memory) 320 that is a rewritable nonvolatile memory provided outside the microcomputer 310, an ECM 200, and a CAN 400. Input circuit 350a, 350b for inputting sensor signal S1, sensor signal S2 for detecting rotation phase adjusted by CAN communication circuit 330, motor 510 drive circuit 340, valve timing control system 500 Etc.

The microcomputer 310 can incorporate an EEPROM which is a rewritable nonvolatile memory.
The sensor signals S1 and S2 are, for example, the sensor signal S1 is a pulse signal for each predetermined rotation angle of the crankshaft, and the sensor signal S2 is a pulse signal for each predetermined rotation angle of the camshaft.

The ECM 200 has a function of inputting various sensor signals to perform arithmetic processing and outputting operation signals to various actuators such as a fuel injection valve and an electric throttle valve as software.
Further, the ECM 200 calculates a target value of the rotational phase RP adjusted by the valve timing control system 500 based on various sensor signals, and transmits the calculated target value data to the VTC controller 300 via the CAN 400.

The VTC controller 300 detects the rotational phase RP adjusted by the valve timing control system 500 based on the sensor signals S1 and S2, and determines the operation signal of the motor 510 so that the detected value of the rotational phase RP approaches the target value. The function to output is provided as software.
Further, the microcomputer 310 of the VTC controller 300 has a function as software for switching the input / output state of the input / output port (initial setting of the input / output state of the port) in the initialization process when the power is turned on.

In the example shown in FIG. 1, the microcomputer 310 has 11 input / output ports 314 a to 314 k.
And in the specification of the vehicle model illustrated in FIG. 1, the input / output state of each port 314a-314k is set as follows.
The port 314a is an output port for CAN communication, the port 314b is an input port for CAN communication, the port 314c is an input port for the sensor signal S1, the port 314d is an input port for the sensor signal S2, and the ports 314e to 314g are drive circuits 340 Port 314h-port 314j is an output port for the EEPROM 320, and port 314k is an input port for the EEPROM 320.
The port to which the port setting method according to the present invention is applied includes an interface port (I / O port) used for input / output of information with a device connected to the outside of the apparatus, timer input / output, communication, and the like. Microcomputer I / O ports can be included.

By the way, at the vehicle design / development stage, the device configuration (hardware) of the valve timing control system 500 to be controlled is changed for each vehicle type, and the input / output state of the port of the microcomputer 310 differs between the old and new device configurations. May be set.
Therefore, identification data unique to the device configuration according to the vehicle type is set as a ROM constant in the program, and the microcomputer 310 switches the initial setting of the input / output state of the port according to the identification data.
The identification data specific to the device configuration corresponding to the vehicle type can be set (stored) in the EEPROM 320 (external EEPROM) or the EEPROM in the microcomputer 310 in addition to the configuration in which the program is set as a ROM constant. In addition to being set as a ROM constant in the program, it can be set in an internal or external EEPROM. That is, the VTC controller 300 may include a nonvolatile memory that stores identification data unique to the device configuration corresponding to the vehicle type.

With such a configuration, a development experiment or the like can be performed by switching the input / output port to a specification suitable for the old and new device configurations by setting the identification data. That is, the identification data is data that designates one of the plurality of port input / output states.
When the product becomes a product, identification data corresponding to the final specification is set. If the identification data has an incorrect value for some reason, the port of the microcomputer 310 is different from the original one. By initializing the output state, the control device may be damaged due to overcurrent or the like.

As a countermeasure when the identification data has an incorrect value, if the microcomputer 310 determines whether the identification data is normal or abnormal, and sets the port to the default when there is an abnormality, the port is put into an incorrect input / output state. Due to the setting, the VTC controller 300 can be prevented from being damaged.
However, when the port of the microcomputer 310 is initialized to the default, the microcomputer 310 cannot perform input / output through the port, that is, the valve timing control system 500 cannot appropriately control the valve timing. This may result in a decrease in the performance of the internal combustion engine.

  Therefore, as will be described in detail later, the microcomputer 310 of the VTC controller 300 is an abnormality detection unit that detects whether the identification data is normal or abnormal. When the identification data is normal, the microcomputer 310 The first setting unit for setting the input / output state of the ports 314a to 314k to the input / output state corresponding to the identification data in the plurality of specifications, when the identification data is abnormal, the ports 314a to 314k of the microcomputer 310 The software includes a function as a second setting unit that sets the input / output state to an input / output state for an abnormal identification data set in one of the plurality of specifications.

The flowchart of FIG. 2 shows an aspect of the initial setting process of the input / output state of the ports 314a to 314k according to the identification data, which is executed by the microcomputer 310.
In the aspect of the setting process shown in the flowchart of FIG. 2, an example in which three new and old specifications (versions) exist as the device configuration of the valve timing control system 500 is shown. Obviously, if a specification exists, a similar process can be applied.

  The microcomputer 310 of the VTC controller 300 performs the process shown in the flowchart of FIG. 2 as an initialization process when the power is turned on to the VTC controller 300. First, in step S810 (abnormality detection unit), the identification data is normal. It is judged whether or not it is abnormal.

For example, as shown in FIG. 3, when the inverted value of the identification data is set together with the identification data, the microcomputer 310 determines that the identification data is normal when the identification data and the inverted value match in step S810. If the identification data does not match the inverted value, it can be determined that the identification data is abnormal.
Further, the microcomputer 310 calculates an error detection code for a data area including the identification data (see FIG. 4), compares the calculated error detection code with a preset error detection code, and the error detection code matches. If the error detection code does not match, it can be determined that the identification data is abnormal.

In the example shown in FIG. 4, identification data and device configuration information and vehicle type information of the valve timing control system 500 corresponding to the identification data are stored, and a data area (memory) including the identification data and device configuration information is stored. An example is shown in which (region) is set to a region where an error detection code is calculated.
Further, the microcomputer 310 calculates, for example, a checksum and parity as an error detection code.

If the configuration is such that an error detection code is calculated for a partial memory area including identification data, the time required for diagnosis can be shortened compared to the case where the entire memory is diagnosed, and the time required for port initialization can be shortened.
Note that the method for detecting abnormality in the identification data is not limited to the above method. For example, the microcomputer 310 sets the identification data as a ROM constant in the program and sets it in an internal or external EEPROM, compares the identification data as the ROM constant with the identification data set in the EEPROM, When the identification data matches, it can be determined that the identification data is normal, and when both identification data do not match, it can be determined that the identification data is abnormal.

If the microcomputer 310 determines that the identification data is normal, the microcomputer 310 proceeds to step S820, and determines whether the identification data is data specifying the device configuration A in the three-specification device configuration AC. .
FIG. 5 exemplifies the transition of the device configuration and control software of the valve timing control system 500 accompanying design development.

First, the device configuration A is set as the control target as the first device configuration, and the control software in the device configuration A is developed as the first specification (first version), and then the control software is improved in the same device configuration A. Set as second specification (second version).
Next, the device configuration is changed from the device configuration A to the device configuration B, control software conforming to the device configuration B is set as the third specification (third version), and the control software is improved with the same device configuration B. It was set as 4 specifications (4th version).
Furthermore, the device configuration is changed from the device configuration B to the device configuration C, and the control software is set as the fifth specification (fifth version) in accordance with the change.

In one aspect in which the specification change has been made, when the microcomputer 310 determines in step S820 that the identification data is data designating the device configuration A, the microcomputer 310 proceeds to step S830, and the input / output state corresponding to the device configuration A ( Ports 314a to 314k are initially set to (A specification) (first setting unit).
If the microcomputer 310 determines in step S820 that the identification data is not data specifying the device configuration A, the microcomputer 310 proceeds to step S840 and determines whether the identification data is data specifying the device configuration B. .

If the identification data is data specifying the device configuration B, the microcomputer 310 proceeds to step S850, and initializes the ports 314a-314k to the input / output state (B specification) corresponding to the device configuration B (first). 1 setting section).
On the other hand, if the identification data is not data specifying the device configuration B, the remaining device configuration C in the three specifications of the device configuration A-C is specified, so the microcomputer 310 proceeds to step S860. The ports 314a to 314k are initially set to an input / output state (C specification) corresponding to the device configuration C (first setting unit).

In this way, at the development stage, the worker selects the identification data to be set as a ROM constant in the program (and / or identification data to be set in the external or internal EEPROM), thereby selecting the device configuration that is the old device configuration. Ports 314a to 314k can be initialized to an input / output state corresponding to A or device configuration B (old specification), and an input / output state corresponding to device configuration C (latest specification), which is the latest device configuration. The ports 314a to 314k can be initialized, and the ports 314a to 314k can be initialized to any of the three specifications according to the identification data setting.
In addition, when analyzing products returned to the market of the VTC controller 300, if it is desired to analyze with the old device configuration (device configuration A or B), and identification data is set as a ROM constant in the program, the worker Can be analyzed with the old device configuration only by making the ROM constant (identification data) of the latest software the old specification without making any significant software changes.

The port initial setting is a process (first setting unit) when the identification data is normal. If the microcomputer 310 determines that the identification data is abnormal in step S810, the process proceeds to step S860. The ports 314a to 314k are initialized to the input / output state corresponding to the configuration C (second setting unit).
That is, the microcomputer 310 selects the input / output state corresponding to the device configuration C as the input / output state for when the identification data is abnormal, and sets the input / output state of the ports 314a to 314k.

Generally, when the device configuration of the valve timing control system 500 is changed with design and development (in other words, when improvements are made sequentially), the latest specification (latest version) becomes the mass production specification (product specification).
Therefore, when the identification data is abnormal, if the ports 314a to 314k are initially set to the input / output state corresponding to the device configuration C which is the latest specification, the identification data becomes abnormal at least in the mass production specification (mass production vehicle). In this case, the ports 314a to 314k are initialized to an input / output state suitable for the device configuration of the combined valve timing control system 500.

In this case, since the input / output states of the ports 314a to 314k are appropriately set, for example, it is suppressed that the port to be set as the input port is erroneously set as the output port. It is possible to prevent the control device from being damaged due to the setting.
Further, even if an abnormality occurs in the identification data, the ports 314a to 314k are not set to defaults, but the ports 314a to 314k are initialized to the input / output state corresponding to the device configuration C that is the latest specification (mass production specification). When the identification data is abnormal, it is possible to suppress the control of the valve timing control system 500 from being disabled, and the operation performance of the internal combustion engine can be maintained.

The VTC controller 300 has a known self-diagnosis function (self-diagnosis unit) for diagnosing the presence or absence of an abnormality in the drive circuit 340, the input circuits 350a and 350b, the EEPROM 320, and the internal device such as the CPU 311. When no abnormality other than identification data is detected by the diagnostic function, the control operation for the valve timing control system 500 is maintained.
That is, the VTC controller 300 initializes the ports 314a to 314k even if the identification data has an abnormality, and enables input / output via the ports 314a to 314k. If an abnormality is found, a fail sale process is performed to stop the control operation of the valve timing control system 500 (energization to the motor 510) or to control the valve timing toward the default position.

  The microcomputer 310 of the VTC controller 300 communicates identification data abnormality information to the ECM 200 via the CAN 400, and the ECM 200 receiving the identification data abnormality information notifies the driver of the identification data abnormality ( Alternatively, the control system of the valve timing control system 500 or the abnormality of the control system of the internal combustion engine may be notified by lighting a warning lamp or the like.

Further, in a mass-produced vehicle, when there are multiple specifications having different device configurations of the valve timing control system 500, the devices of the valve timing control system 500 to be applied to the nonvolatile memory (ROM, external EEPROM, internal EEPROM) of the VTC controller 300 When information for identifying the configuration specification is written and reprogramming is performed, it is determined whether the device configuration of the valve timing control system 500 is compatible based on the information, and the compatibility is confirmed. In this configuration, reprogramming is executed.
As a result, it is possible to prevent an incompatible program from being erroneously written to the VTC controller 300 that controls the valve timing control system 500 having different specifications.

The technical ideas described in the above embodiments can be used in appropriate combination as long as no contradiction arises.
Although the contents of the present invention have been specifically described with reference to preferred embodiments, it is obvious that those skilled in the art can take various modifications based on the basic technical idea and teachings of the present invention. It is.
In the above embodiment, the microcomputer 310 that performs the initial setting of the input / output state of the port based on the identification data constitutes a control unit that controls the valve timing control system 500, but instead of the valve timing control system 500, the variable compression ratio The port initial setting of the microcomputer constituting the control unit for controlling the mechanism can be performed in the same manner, and in this case, the same operation and effect as described above can be obtained. That is, the control target device of the vehicle electronic control device according to the present invention is not limited to the valve timing control system 500.

Here, the technical idea that can be understood from the above-described embodiment will be described below.
As one aspect, the vehicle electronic control device is a vehicle electronic control device that includes a microcomputer and controls an actuator based on a target value received from an external device, and stores identification data specific to the device configuration of the actuator. A non-volatile memory that detects the presence or absence of an abnormality in the identification data, and an input / output state of a port of the microcomputer when the identification data is normal, the identification data in a plurality of specifications A first setting unit for setting an input / output state corresponding to the second setting, and a second setting for setting the input / output state of the port of the microcomputer to the latest version of the plurality of specifications when the identification data is abnormal Part.

In a preferred aspect of the vehicle electronic control device, the actuator is a valve timing control system in which a valve timing of an intake / exhaust valve of an internal combustion engine is variable by a motor.
In another preferred embodiment, the external device is a control unit that controls fuel injection to the internal combustion engine.

200 ... ECM, 300 ... VTC controller (electronic controller for vehicle), 310 ... microcomputer, 311 ... CPU, 312 ... ROM, 313 ... RAM, 320 ... EEPROM (nonvolatile memory), 330 ... CAN communication circuit, 340 ... Drive circuit, 350a, 350b ... input circuit, 500 ... valve timing control system, 510 ... motor

Claims (4)

A non-volatile memory for storing identification data unique to the device configuration according to the vehicle type;
An abnormality detection unit for detecting the presence or absence of an abnormality in the identification data;
A first setting unit that sets an input / output state of a port to an input / output state corresponding to the identification data in a plurality of specifications when the identification data is normal;
A second setting unit that sets the input / output state of the port to an input / output state for abnormal identification data defined in one of the plurality of specifications when the identification data is abnormal;
An electronic control device for a vehicle.   The vehicle electronic control device according to claim 1, wherein the input / output state for when the identification data is abnormal is a latest version of the plurality of specifications. A self-diagnosis unit for diagnosing the presence or absence of abnormality in the vehicle electronic control device;
The vehicle electronic control device according to claim 1 or 2, wherein the self-diagnosis unit maintains a control operation when no abnormality other than the identification data is detected. A method for setting a port of a vehicle electronic control device including a nonvolatile memory that stores identification data specific to a device configuration according to a vehicle type,
Detecting the presence or absence of abnormality of the identification data;
When the identification data is normal, setting the input / output state of the port to an input / output state corresponding to the identification data in a plurality of specifications;
When the identification data is abnormal, setting the input / output state of the port to the latest version in the plurality of specifications;
A method for setting a port of a vehicle electronic control device.