JP4707411B2 - Electronic control device for vehicle - Google Patents

Description

  The present invention relates to a vehicular electronic control device for controlling a vehicle, and more particularly to a vehicular electronic control device that stores a learning value or control data calculated by learning control in a nonvolatile ROM capable of electrically rewriting data. About.

  In a vehicle electronic control device (hereinafter referred to as an ECU) that controls a vehicle engine or an automatic transmission, control parameters are evaluated by evaluating past control results in order to eliminate the influence of temporal changes and individual differences of the control target. So-called learning control that modifies the control logic is widely adopted.

For example, in an engine fuel injection control device (hereinafter referred to as EFI-ECU), in order to obtain a mixed gas having an appropriate air-fuel ratio, the state of the vehicle is detected by various sensors and processed, and an actuator such as a fuel injection valve Is operating. The previous control values such as the injection timing and the injection amount are stored as learning values and used as control values at the next engine start.
The learning value acquired in such learning control is stored in a standby RAM (hereinafter referred to as SRAM). Note that the SRAM is a RAM that is constantly supplied with power by a battery voltage, and is also referred to as a backup RAM.

However, if the learning value is stored only in the standby RAM, the learning value calculated so far is lost when the battery is removed from the vehicle or removed. Therefore, in recent years, when a learning value is written in a nonvolatile ROM such as an EEPROM that can electrically rewrite data, and it is determined that the battery is disconnected, the learning value is transferred from the nonvolatile ROM to a normal RAM. The learning value calculated in the past can be continuously used (for example, refer to Patent Document 1).
JP 2002-195091 A

  Recently, the number of vehicles equipped with an anti-theft function called an immobilizer is increasing. Various control data such as an ID code (hereinafter referred to as an immobilizer ID) for realizing this immobilizer function (for example, for an engine). Are also stored in a non-volatile ROM.

  As described above, when the battery of the vehicle is removed, the power supply is cut off, and the SRAM storing the control data is cleared. Therefore, conventionally, when the battery is disconnected, it is nonvolatile when the initial ignition switch is turned on. Data is read from the read-only ROM and data is stored in the SRAM.

However, since the learning value at the time of shifting is stored in the nonvolatile ROM and it takes time to transfer data to the SRAM, there is a problem that the shock at the time of shifting becomes large until the data storage in the SRAM is completed. It was.
In addition, as described above, immobilizer ID and various other control data of the vehicle are also stored in the nonvolatile memory, and it is expected that the amount of data stored in the nonvolatile ROM will increase in the future. The problem is believed to have a greater impact.

  The present invention has been made in view of the above-described problem, and can reduce the time required for data restoration to the SRAM, and can be adapted to increase the amount of control data stored in the nonvolatile ROM. An object is to provide an electronic control device.

In order to achieve the above-described object, an electronic control device for a vehicle (1) according to the present invention includes:
A standby RAM, which is a RAM connected to the battery without going through the ignition switch,
Non- volatile storage means composed of non-volatile memory;
Host control means for performing predetermined control using data stored in the standby RAM ;
When it is detected that the battery has been removed from the vehicle , the host control means is activated when the battery is connected and the ignition switch is off, and the nonvolatile memory is the data stored in the unit, characterized in that and a control means for causing the data restoring process to be stored in the standby RAM.

Moreover, the vehicle electronic control device (2) according to the present invention is the vehicle electronic control device (1).
The control means is communication control means having an on / off function and a communication function of a power supply relay to the host control means and the nonvolatile storage means.

Furthermore, the vehicle electronic control device (3) according to the present invention is a vehicle electronic control device (2).
When the communication control record with the host control means is cleared, the communication control means determines that the battery has been removed, turns on the power supply relay, and performs data restoration processing on the host control means. It is characterized by making it.

The vehicle electronic control device (4) according to the present invention includes a vehicle electronic control device (2),
The communication control means starts the host control means by periodically turning on the power supply relay, and when the data of the host control means is cleared, the host control means performs data restoration processing. It is characterized by performing.

Furthermore, the vehicle electronic control device (5) according to the present invention is the vehicle electronic control device (3) or (4).
If the ignition switch is turned off after completion of data restoration, the host control means makes a request for turning off the power supply relay to the communication control means.

The vehicle electronic control device (6) according to the present invention is the vehicle electronic control device (3) or (4).
When the ignition switch is turned on during data recovery, the host control means shifts to normal control and continues the data recovery process,
The vehicle electronic control device (7) according to the present invention is the vehicle electronic control device (3) or (4).
If the ignition switch is on after completion of data restoration, the host control means makes a request to turn on the power supply relay to the communication control means.

Furthermore, the vehicle electronic control device (8) according to the present invention is the vehicle electronic control device (5) or (7),
If there is a power supply relay ON / OFF request from said host control means, by said communication control means records the communication history between the host control unit, and to store the data restoration processing completion .

The vehicle electronic control device (9) according to the present invention is the vehicle electronic control device (1).
A dedicated port or connector for selecting a function for data restoration processing is provided, and whether the operation of the data restoration processing function can be set or not can be set depending on the state of the port or connector.

Furthermore, the vehicle electronic control device (10) according to the present invention includes:
First nonvolatile storage means for holding data by constantly supplying power from a battery to a volatile memory;
A second non-volatile storage means configured by a non-volatile memory;
Control means for performing vehicle control using data stored in the first non-volatile storage means;
An activation control means for activating the control means when detecting that the supply voltage to the first non-volatile storage means has fallen below a predetermined voltage capable of holding data when the control means is powered off; With
The control means stores data stored in the second non-volatile storage means in the first non-volatile storage means when activated by the activation control means.

Moreover, the data restoration processing method (1) of the vehicle electronic control device according to the present invention includes:
In a data recovery processing method for a vehicle electronic control device in which a host control unit takes control data stored in a non-volatile storage unit into a standby RAM that is a RAM connected to a battery without passing through an ignition switch . ,
When it is detected that the battery has been removed from the vehicle , the host control means is activated when the battery is connected and the ignition switch is off, and the nonvolatile memory is A data restoration process for storing the data stored in the means in the standby RAM is performed.

According to the vehicle electronic control devices (1) to (8), (10) and the vehicle electronic control device data restoration processing method (1) according to the present invention, when the battery is reconnected after the battery is removed. Because data recovery processing can be performed while the ignition switch is off, there is no need for data recovery processing after the ignition switch is turned on, shortening the data recovery time and increasing the amount of control data stored in the nonvolatile storage means It becomes easy to handle.

In addition, according to the vehicle electronic control device (9) of the present invention, the dedicated port or connector for selecting the function of the data restoration process is provided, and the operation of the data restoration processing function is set according to the state of the port or the connector. Therefore, it is possible to deal with a vehicular electronic control apparatus that does not have this system with a single software.

Embodiments of an electronic control device for a vehicle according to the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a system configuration in which the vehicle electronic control device of the present invention is applied to an EFI-ECU. The EFI-ECU 1 includes a host CPU 11, an EEPROM 12, a SRAM 13, a communication IC 14 having a timer 15, a power supply IC 16, The main relay control IC 17 includes a voltage + B supplied from the battery 3 to the power supply IC 16 via the main relay 2, and the power supply IC 16 supplies power to the host CPU 11 and the EEPROM 12. Note that a voltage is constantly supplied from the battery 3 to the SRAM 13.

  The host CPU 11 executes a fuel injection control function, and the EEPROM 12 stores data such as a learned value as described above. The host CPU 11 stores data such as a learned value read from the EEPROM 12 in the SRAM 13. The communication IC 14 is always supplied with the voltage from the battery 3, and when the battery is connected, the main relay 2 is turned on via the main relay control IC 17 to restore the data stored in the EEPROM 12 to the host CPU 11. When the host CPU 11 requests the main relay to be turned on / off, the communication history with the host CPU 11 is recorded to store the completion of the data restoration process.

On the other hand, the main relay control IC 17 turns on the main relay 2 by driving the coil of the main relay 2 when the ignition switch IGSW is turned on or when a drive signal for the main relay 2 is received from the communication IC 14. .
The function switching connector or port of the EFI-ECU 1 is a function selection terminal for data restoration function when the battery is on. When the input of this terminal is 1, the data restoration function program when the battery is on is executed. Thus, when the input of this terminal is 0, the data restoration function program when the battery is on is set not to be executed.

Next, details of the operation of the EFI-ECU 1 when power is restored will be described with reference to the flowcharts of FIGS.
2 is a flowchart showing the operation of the communication IC 14 when the power is restored, and FIG. 3 is a flowchart showing the operation of the host CPU 11 when the power is restored.

When the BATT terminal to which the battery 3 is connected turns from OFF to ON, the communication IC 14 starts the power recovery program shown in the flowchart of FIG. 2, and first, whether or not a communication history is recorded in a memory (not shown). Is determined (step 101). When the battery 3 is removed, the communication history of the SRAM 13 and the communication IC 14 is cleared. If the communication history is cleared when the power is turned on, the communication IC 14 determines that the battery has been turned off, and the main relay control IC 17 The relay drive signal is output and the host CPU 11 is instructed to restore the data (step 102).
As a result, the main relay control IC 17 drives the coil of the main relay 2 to turn on the main relay 2, and the voltage + B of the battery 3 is supplied to the power supply IC 16 via the main relay 2. Power is supplied to the CPU 11 and the EEPROM 12.

On the other hand, when the data recovery process is instructed from the communication IC 14, the host CPU 11 starts the SRAM data recovery program shown in the flowchart of FIG. 3, reads the data from the EEPROM 12 and stores it in the SRAM 13, thereby executing the SRAM data recovery process. Perform (step 201). Next, the host CPU 11 determines whether or not the SRAM data restoration process is completed (step 202). When the SRAM data restoration process is completed, the host CPU 11 determines whether or not the ignition switch is off (step 203).
If the ignition switch is turned on during SRAM data recovery, the host CPU 11 shifts to normal control and continues data recovery processing.

  If it is determined that the ignition switch is off, the host CPU 11 transmits a main relay off request signal to the communication IC 14 (step 204). If it is determined that the ignition switch is on, the host CPU 11 performs normal fuel injection control (step 205) and transmits a main relay on request signal to the communication IC 14 (step 206).

  On the other hand, when the communication IC 14 outputs the main relay drive signal and the data return command in step 102 of the flowchart of FIG. 2, the communication IC 14 counts up the timer time T of the timer 15 (step 103), and then from the host CPU 11 to the main relay. It is determined whether an on / off request signal has been received (step 104). If it is determined that the main relay on / off request signal has not been received from the host CPU 11, the communication IC 14 determines whether or not a certain time has passed since the main relay on request signal was output based on the time T of the timer 15. If it is determined (step 105) and it is determined that the predetermined time has not elapsed, the process returns to step 103 and the timer time T of the timer 15 is counted up.

  If it is determined in step 105 that a certain time has elapsed since the main relay on request signal was output, the communication IC 14 clears the timer time T of the timer 15 (step 106), and whether or not the number of retries has exceeded three. Is determined (step 107). If it is determined that the number of retries does not exceed 3, the communication IC 14 performs a retry by instructing the host CPU 11 to perform the data restoration process again (step 108). If it is determined in step 107 that the number of retries exceeds three, the communication IC 14 determines that the communication with the host CPU 11 is abnormal, and sends a main relay off signal to the main relay control IC 17 to supply power to the host CPU 11. Supply is stopped (step 109).

  On the other hand, if it is determined in step 104 that the main relay on / off request signal has been received from the host CPU 11, the communication IC 14 records the communication history with the host CPU 11 in the memory, thereby storing the completion of the data restoration process (step 110). ) Thereafter, a main relay off command signal is transmitted to the main relay control IC 17 to turn off the main relay 2 (step 109), and the program is terminated. In this case, if the ignition switch IGSW is on, the main relay 2 continues to be on.

As described above, when the removal of the battery is detected by the communication record of the communication IC 14, data recovery is performed while the ignition switch is turned off. Therefore, data restoration processing after the ignition switch is turned on becomes unnecessary, and the data restoration time is shortened. Can do.
Further, if there is a communication abnormality between the communication IC 14 and the host CPU 11, a retry is made, and if a plurality of retries fail, it is determined that there is a communication abnormality and the main relay 2 is turned off, so that the EFI-ECU 1 remains activated. It is possible to prevent the battery from running out.

  In the above embodiment, when the communication history is cleared when the power is turned on, the communication IC 14 drives the main relay 2 and instructs the host CPU 11 to perform the data restoration process. If the SRAM data is cleared, the data is read from the EEPROM 12 and stored in the SRAM 13. If the communication history is cleared, the communication IC 14 drives the main relay 2, By only starting the host CPU 11, it is possible to perform data restoration while the ignition switch is turned off, as described above, without issuing a data restoration command.

Further, in the above embodiment, the data restoration is performed when the removal of the battery is detected. However, the SRAM 13 is also restored when the supply voltage to the SRAM 13 is reduced to a predetermined voltage or less that can hold the data. It is also possible to perform the data restoration process to.
Further, in the embodiment of the flowchart of FIG. 2 described above, it is determined whether or not there is a communication abnormality by determining whether or not a main relay on / off request signal is received from the host CPU. Whether or not there is a communication abnormality can also be determined by determining whether or not.

In the above embodiment, the SRAM data restoration process is performed immediately after the power supply is restored, but the SRAM data restoration process is periodically performed by issuing a main relay ON request and a data restoration command at regular intervals. In the following, the operation when the SRAM data restoration process is performed periodically will be described with reference to the flowcharts of FIGS.
4 is a flowchart showing the operation of the communication IC 14 during the regular processing, and FIG. 5 is a flowchart showing the operation of the host CPU 11 during the regular processing. The system configuration is the same as that in FIG.

The communication IC 14 executes the periodic processing program shown in the flowchart of FIG. 4 at regular time intervals, for example, every several hours, when the main relay 2 is off. The relay drive signal is output and the host CPU 11 is instructed to restore the data (step 301).
Thus, as described above, the main relay control IC 17 drives the coil of the main relay 2 to turn on the main relay 2, and the power supply IC 16 supplies power to the host CPU 11 and the EEPROM 12.

On the other hand, when the data recovery process is instructed from the communication IC 14, the host CPU 11 starts the SRAM data recovery program shown in the flowchart of FIG. 5, and first checks whether the SRAM data is cleared by checking the data in the SRAM 13. It is determined whether or not (step 401). If it is determined that the SRAM data has been cleared, the host CPU 11 determines that the battery has been removed, and reads the data from the EEPROM 12 and stores it in the SRAM 13 to perform SRAM data restoration processing (step 402). Next, the host CPU 11 determines whether or not the SRAM data restoration process is completed (step 403). When the host CPU 11 determines that the SRAM data restoration process is completed, the host CPU 11 determines whether or not the ignition switch is turned off (step 403). 404).
Even when it is determined in step 401 that the SRAM data is not cleared, the host CPU 11 determines whether the ignition switch is off (step 404).

  When it is determined that the ignition switch is off, the host CPU 11 transmits a main relay off request signal to the communication IC 14 (step 405). If it is determined that the ignition switch is on, the host CPU 11 performs normal fuel injection control (step 406) and transmits a main relay on request signal to the communication IC 14 (step 407).

  On the other hand, when the communication IC 14 outputs the main relay drive signal and the data return command in step 301 of the flowchart of FIG. 4, the communication IC 14 counts up the timer time T of the timer 15 (step 302), and then the main relay from the host CPU 11. It is determined whether an on / off request signal has been received (step 303). If it is determined that the main relay on / off request signal has not been received from the host CPU 11, the communication IC 14 determines whether or not a certain time has passed since the main relay on request signal was output based on the time T of the timer 15. If it is determined (step 304) and it is determined that the predetermined time has not elapsed, the process returns to step 302 and the timer time T of the timer 15 is counted up.

  If it is determined in step 304 that a certain time has elapsed since the main relay on request signal was output, the communication IC 14 cleared the timer time T of the timer 15 (step 305), and then whether or not the number of retries has exceeded three times. Is determined (step 306). If it is determined that the number of retries does not exceed 3, the communication IC 14 performs a retry by issuing a data return command to the host CPU 11 again (step 307). If it is determined in step 306 that the number of retries has exceeded three, the communication IC 14 determines that the communication with the host CPU 11 is abnormal, and sends a main relay off signal to the main relay control IC 17 to supply power to the host CPU 11. Supply is stopped (step 308).

  On the other hand, when it is determined in step 303 that the main relay on / off request signal has been received from the host CPU 11, the communication IC 14 transmits the main relay off command signal to the main relay control IC 17 to turn off the main relay 2 (step 308), and the program is terminated. Similarly to the above, in this case, if the ignition switch IGSW is on, the main relay 2 continues to be on.

  As described above, by executing the SRAM data recovery process at regular intervals while the main relay 2 is off, data recovery can be performed while the ignition switch is off, as described above. The data restoration process is not required, and the data restoration time can be shortened.

  In the above embodiment, the example in which the vehicle electronic control device of the present invention is applied to the EFI-ECU has been described. However, the vehicle electronic control device of the present invention is mounted on a vehicle other than the EFI-ECU. It can be applied to various ECUs.

It is a block diagram which shows the structure of the system which applied the electronic controller for vehicles of this invention to EFI-ECU. It is a flowchart which shows the effect | action of communication IC14 at the time of a power return. It is a flowchart which shows the effect | action of the host CPU11 at the time of a power return. It is a flowchart which shows the effect | action of communication IC14 in the case of performing a restoration process of SRAM data regularly. It is a flowchart which shows the effect | action of the host CPU11 when performing a restoration process of SRAM data regularly.

Explanation of symbols

1 EFI-ECU
11 Host CPU
12 EEPROM
13 SRAM
14 Communication IC
15 Timer 16 Power supply IC
17 Main relay control IC
2 Main relay 3 Battery

Claims (11)

A standby RAM, which is a RAM connected to the battery without going through the ignition switch,
Non- volatile storage means composed of non-volatile memory;
Host control means for performing predetermined control using data stored in the standby RAM ;
When it is detected that the battery has been removed from the vehicle , the host control means is activated when the battery is connected and the ignition switch is off, and the nonvolatile memory is An electronic control device for a vehicle , comprising: control means for performing data restoration processing for storing data stored in the means in the standby RAM . In the vehicle electronic control device according to claim 1,
The vehicle electronic control device, wherein the control means is a communication control means having an on / off function and a communication function of a power supply relay to the host control means and the nonvolatile storage means. In the vehicle electronic control device according to claim 2,
When the communication control record with the host control means is cleared, the communication control means determines that the battery has been removed, turns on the power supply relay, and performs data restoration processing on the host control means. An electronic control device for a vehicle. In the vehicle electronic control device according to claim 2,
The communication control means starts the host control means by periodically turning on the power supply relay, and when the data of the host control means is cleared, the host control means performs data restoration processing. An electronic control device for a vehicle, characterized in that: In the vehicle electronic control device according to claim 3 or 4,
If the ignition switch is off after completion of data restoration, the host control means makes a request to turn off the power supply relay to the communication control means. In the vehicle electronic control device according to claim 3 or 4,
An electronic control device for a vehicle, characterized in that when the ignition switch is turned on during data recovery, the host control means shifts to normal control and continues the data recovery processing. In the vehicle electronic control device according to claim 3 or 4,
If the ignition switch is on after completion of the data restoration, the host control means makes a request to turn on the power supply relay to the communication control means. In the vehicle electronic control device according to claim 5 or 7,
When there is a power supply relay ON / OFF request from the host control means, the communication control means records a communication history with the host control means, thereby storing the completion of data restoration processing. Electronic control device for vehicles. In the vehicle electronic control device according to claim 1,
An electronic control device for a vehicle, comprising a dedicated port or connector for selecting a function for data restoration processing, wherein the operation of the data restoration processing function can be set according to the state of the port or connector. First nonvolatile storage means for holding data by constantly supplying power from a battery to a volatile memory;
A second non-volatile storage means configured by a non-volatile memory;
Control means for performing vehicle control using data stored in the first non-volatile storage means;
An activation control means for activating the control means when detecting that the supply voltage to the first non-volatile storage means has fallen below a predetermined voltage capable of holding data when the control means is powered off; With
The control means, when activated by the activation control means, causes the data stored in the second nonvolatile storage means to be stored in the first nonvolatile storage means. apparatus. In a data recovery processing method for a vehicle electronic control device in which a host control unit takes control data stored in a non-volatile storage unit into a standby RAM that is a RAM connected to a battery without passing through an ignition switch . ,
When it is detected that the battery has been removed from the vehicle , the host control means is activated when the battery is connected and the ignition switch is off, and the nonvolatile memory is A data recovery processing method for an electronic control unit for a vehicle, characterized in that a data recovery process for storing the data stored in the means in the standby RAM is performed.