JP2006335180A - Control system of hybrid electric vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control system of a hybrid electric vehicle (HEV) capable of preventing a standstill of the traveling HEV even in a failure of hardware of a control unit integrally controlling the vehicle without having considerable cost increase. <P>SOLUTION: The control system of the hybrid electric vehicle comprises a plurality of control units ECM13, M/C14, and ATCU15 respectively controlling various control targets of the hybrid electric vehicle (HEV), and a hybrid controller module (HCM) 11 which integrally controlling the HEV by outputting various command values to the various control targets of the HEV on the basis of various input information and has a part of a plurality of functions prepared in the respective control units. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a control system for a hybrid electric vehicle, and more particularly to a control system for a hybrid electric vehicle including a control unit that calculates various control commands.

  Conventionally, in a hybrid electric vehicle (HEV), a hybrid controller module (HCM) is mounted as a control unit (C / U) for integrated control of the vehicle.

  This HCM receives signals such as battery capacity, accelerator opening, and vehicle speed as inputs, so that the HEV can be operated in an optimal state. Torque command to the engine, torque command to the motor, shift to the transmission (transmission) Calculate the command. The engine control command, which is the calculation result, is sent to the ECM (Engine Controller Module) which is the engine C / U, the motor control command is sent to the M / C (Motor Controller) which is the motor C / U, and the transmission control command is sent to the transmission. It outputs to ATCU (Automatic Transmission Control Unit) which is C / U.

  FIG. 2 is a block diagram schematically showing the configuration of a control system mounted on a conventional HEV. As shown in FIG. 2, the control system 1 mounted on the HEV includes an HCM 2 and an ECM 4, an M / C 5, and an ATCU 6 connected to the HCM 2 via the serial communication bus 3. The HCM 2 is an ECM 4. Engine control command value a, M / C5 motor control command value b, and ATCU5 shift control command value c.

  The HCM 2 includes a main CPU (Central Processing Unit) 2a and a monitoring IC (sub CPU) 2b that exchange information with each other. Based on various input information such as battery capacity, accelerator opening, and vehicle speed, the main CPU 2a executes an application program (APP) to perform an engine command calculation, a motor command calculation, a shift command calculation, and an engine control command. A value a, a motor control command value b, and a shift control command value c are output. The monitoring IC 2b performs a fail safe (F / S) process as necessary to stop the vehicle.

  The ECM 4 includes a main CPU 4a and a monitoring IC (sub CPU) 4b that exchange information with each other. The main CPU 4a executes an application program and performs engine control based on an engine control command value a. The M / C 5 has a main CPU 5a and a monitoring IC (sub CPU) 5b that exchange information with each other, and the main CPU 5a executes an application program and based on a motor control command value b, a motor generator (Motor Generator) : MG) Control is performed. The ATCU 6 includes a main CPU 6a and a monitoring IC (sub CPU) 6b that exchange information with each other, and the main CPU 6a executes an application program and performs shift control based on the shift control command value c.

That is, the ECM 4, M / C 5, ATCU 6, and other C / Us control each unit according to various control command values from the HCM 2, thereby controlling HEV.
As such a control system, for example, a “vehicle control device” (see Patent Document 1) is known. This "vehicle control device" outputs an activation signal from the vehicle control means to each control means of the engine control means, the motor / generator control means, and the battery control means when the engine is started, and if the engine start is confirmed, The vehicle connecting means controls the connecting means for connecting the high voltage battery and the motor / generator.
JP 2004-245100 A

  However, in the conventional HEV control, the HCM2 hardware (CPU, etc.) has failed because the ECM4, M / C5, ATCU6, and other C / U follow the HCM2 instructions. In this case, since the command value itself output from the HCM 2 becomes unreliable and cannot be controlled according to the command value, the HEV travel is stopped. For this reason, for example, during traveling, the vehicle cannot be moved from the traveling lane.

In order to cope with the occurrence of such a situation, for example, it is conceivable that the HCM 2 is replaced with two CPUs or a spare of the HCM 1 is installed to make a dual system, but in this case, a significant increase in cost is avoided. I can't.
An object of the present invention is to provide a control system for a hybrid electric vehicle that does not stop the HEV running even if the hardware of a control unit that performs integrated control of the vehicle breaks down without significantly increasing the cost. It is.

  In order to achieve the above object, a control system for a hybrid electric vehicle according to the present invention includes a plurality of control units that respectively control various control objects of a hybrid electric vehicle (HEV), and various control objects of the HEV based on various input information. The HEV is integratedly controlled by calculating and outputting various command values, and a hybrid controller module (HCM) having a part of a plurality of functions provided in each control unit is included.

  According to the present invention, the hybrid controller module (HCM) that performs integrated control of the HEV by calculating and outputting various command values to various control targets of the hybrid electric vehicle (HEV) based on various input information is used for various control of the HEV. It is equipped with some of the multiple functions provided by multiple control units that control each object. For this reason, without significantly increasing the cost, the HEV traveling is not stopped even if the hardware of the control unit that integrally controls the vehicle breaks down.

The best mode for carrying out the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram schematically showing a configuration of a control system mounted on an HEV according to an embodiment of the present invention. As shown in FIG. 1, a control system 10 mounted on a hybrid electric vehicle (HEV) is connected via a serial communication bus 12 to an HCM 11 that is a control unit (C / U) that integrally controls the vehicle, and the HCM 11. The ECM 13 is an engine (ENG) C / U, the M / C 14 is a motor C / U, and the ATCU 15 is a transmission (transmission) C / U. The ECM 13, M / C 14, and ATCU 15 are unit control C / Us of respective units to be controlled. For example, an ECU (Electronic Control Unit) is used.

  The HCM 11 has a main CPU 11a and a monitoring IC (sub CPU) 11b that exchange information with each other. In the main CPU 11a, the basic control unit executes an application program (APP) based on various input information such as battery capacity, accelerator opening, and vehicle speed, and performs HEV integrated control and ECU failure control.

By HEV integrated control, various processes such as engine command calculation, motor generator (MG) command calculation, shift command calculation, air conditioning control, meter control, auxiliary machine control, input calculation, various diagnoses, etc. are performed, and at the time of ECU failure Various processes such as engine control, motor generator control, and shift control are performed by the control. Engine control, motor generator control, and shift control performed by the ECU failure control are functions provided in each of the ECM 13, the M / C 14, and the ATCU 15.
The monitoring IC 11b checks whether the arithmetic processing of the main CPU 11a is correctly performed.

  The ECM 13 includes a main CPU 13a and a monitoring IC (sub CPU) 13b that exchange information with each other, and also includes an input IC 13c that receives input information and an output IC 13d that outputs output information. The main CPU 13a executes an application program and performs engine control such as fuel injection control, ignition control, and ETC (Electric Throttle Control) control. The monitoring IC 13b checks whether the arithmetic processing of the main CPU 13a is correctly performed.

  The M / C 14 includes a main CPU 14a and a monitoring IC (sub CPU) 14b that exchange information with each other, and also includes an input IC 14c that receives input information and an output IC 14d that outputs output information. The main CPU 14a executes an application program and performs MG control such as PWM (Pulse Width Modulation) control, current control, and rotation speed calculation. The monitoring IC 14b checks whether the arithmetic processing of the main CPU 14a is correctly performed.

  The ATCU 15 includes a main CPU 15a and a monitoring IC (sub CPU) 15b that exchange information with each other, an input IC 15c that receives input information, and an output IC 15d that outputs output information. The main CPU 15a executes an application program and performs shift control such as solenoid control, shift control, and slip control. The monitoring IC 15b checks whether the arithmetic processing of the main CPU 15a is correctly performed.

  That is, the hybrid electric vehicle control system 10 has a part of the functions installed in the ECM 13, M / C 14, and ATCU 15, which are unit control C / Us, installed in the HCM 11. The functions installed in the HCM 11 can at least control each unit to be controlled by the ECM 13 that controls the engine, the M / C 14 that controls the motor & inverter, and the ATCU 15 that controls the transmission (Automatic Transmission: AT). It is a function.

  Then, the input information of the input IC 13c and the output information of each output IC 13d in the ECM 13 and the engine control information in the ECU failure control of the HCM 11 are mutually exchanged, and the HCM 11 collates the information from the ECM 13. Similarly, the input information of the input IC 14c in the M / C 14 and the output information of each output IC 14d and the motor generator control information in the ECU failure control of the HCM 11 are mutually exchanged, and the HCM 11 collates the information from the ECM 13, The input information of the input IC 15c and the output information of each output IC 15d in the ATCU 15 and the shift control information in the ECU failure control of the HCM 11 are mutually exchanged, and the HCM 11 collates the information from the ECM 13.

If the information from the unit control C / U (ECM13, M / C14, ATCU15) and the internal operation value of the HCM 11 are different from each other as a result of collation, the unit control C / U hardware (CPU, etc.) has failed. Is determined.
After the failure of the unit control C / U hardware (CPU or the like), the unit controlled by the determination unit control C / U (any one of the ECM13, M / C14, and ATCU15) is changed to the HCM11. The HCM 11 controls each unit to be controlled by the ECM 13, the M / C 14, and the ATCU 15.

  In other words, since the HCM 11 has a part of the function of the ECU that is the unit control C / U, even if the unit control ECU breaks down, the HCM 11 can realize a function in place of the ECU, so that the vehicle can travel. Become. It is possible to cope even if the unit control ECU has a plurality of failures. In addition, since the HCM 11 is monitoring the CPU processing of the unit control C / U (ECM13, M / C14, ATCU15), the monitoring ICs of the unit control C / U are not required and each monitoring IC is installed. Can be reduced.

  As described above, some of the functions (engine control by the ECM 13, motor & inverter control by the M / C 14, shift control by the ATCU 15) mounted on the unit control C / U are mounted on the HCM 11. The functions installed in the HCM 11 are functions capable of at least controlling each unit to be controlled by the unit control C / U, that is, the ECM 13 is the engine, the M / C 14 is the motor & inverter, and the ATCU 15 is the transmission. Is a function that can be controlled at a minimum.

For example, ECM 13 is fuel injection control, ignition control, air amount calculation, ETC control, etc. M / C 14 is PWM control, current control, rotation speed calculation, etc. ATCU 15 is solenoid control, shift calculation, For example, slip control. This is an example, and the mounted function is arbitrarily changed according to the vehicle travel request level after the failure.
In other words, since the HCM 11 has a function capable of at least controlling each unit that is a control target of the unit control C / U, vehicle control can be performed even if the unit control C / U is in a hardware (CPU or the like) failure state. It becomes possible, and it can continue driving | running | working avoiding a vehicle stop. Further, even if a plurality of unit control C / Us fail, the HCM 11 can cope with all of them, so that reliability is improved.

Further, the HCM 11 collates information from the unit control C / U. Since the HCM 11 has some of the functions of the ECM 13, M / C 14, and ATCU 15, the command value from the unit control C / U can be collated with the internal calculation value of the HCM 11. As a result of collation, if the information from the unit control C / U and the HCM internal calculation value are different, it is determined that a hardware (CPU or the like) failure of the unit control C / U has occurred.
In other words, the HCM 11 can determine whether or not the operation value of the unit control C / U is correct, and can detect a hardware (CPU, etc.) failure from the determination result. Existing monitoring ICs can be abolished, resulting in cost reduction.

In addition, after the HCM 11 determines that the unit control C / U hardware (CPU or the like) has failed, the C / U control target unit is shifted to the fail-safe (F / S) mode controlled by the HCM 11. As a result, even if the hardware (CPU etc.) of the unit control C / U breaks down, it is possible to run the vehicle by controlling the control target unit. Can do.
When it is determined that the HCM 11 has a hardware failure, the fact that the HCM 11 has failed is displayed on a display device or the like to notify the driver or the like. In this way, by notifying the driver or the like that the HCM 11 is out of order by notifying means such as a display device, it is possible to quickly know the occurrence of the failure, and early inspection and repair of the failure location, and It can be done reliably.

  The functions of the unit control C / U mounted on the HCM 11 are as follows. First, a function (program) that allows the unit control C / U to control each unit to be controlled at a minimum. Second, ROM constants (data tables necessary for control of driving force map, rotation speed, torque limit value, etc.) necessary for control can be directly written into the program. Third, ROM constants that are difficult to write directly into the program can be obtained by learning in the HCM 11 based on information in the normal control state.

  That is, since ROM constants can be written directly into the program, the ROM capacity can be reduced. Further, since the function can be acquired by learning in the HCM 11, the memory capacity of the HCM 11 can be reduced, and the reduced amount is applied to another function, so that the unit control C / U fail-safe (F / S) The reliability of vehicle control after is improved.

  As described above, according to the present invention, the hybrid controller module (HCM) that calculates and outputs various command values to various control targets of the hybrid electric vehicle (HEV) based on various input information, and performs integrated control of the HEV, Since some of the functions of the multiple control units that control various HEV control objects are installed, the hardware of the control unit that integrates and controls the vehicle has failed without significantly increasing costs. Even if it does, HEV traveling is not stopped.

It is a block diagram which shows roughly the structure of the control system mounted in HEV which concerns on one embodiment of this invention. It is a block diagram which shows roughly the structure of the control system mounted in the conventional HEV.

Explanation of symbols

10 Hybrid electric vehicle control system 11 HCM
11a, 13a, 14a, 15a Main CPU
11b, 13b, 14b, 15b Monitoring IC
12 Serial communication bus 13 ECM
13c, 14c, 15c Input IC
13d, 14d, 15d output IC
14 M / C
15 ATCU

Claims (6)

A plurality of control units for controlling various control targets of a hybrid electric vehicle (HEV);
A hybrid controller module that calculates and outputs various command values to various control targets of the HEV based on various input information, performs integrated control of the HEV, and includes a part of a plurality of functions included in each control unit ( HCM) and a hybrid electric vehicle control system.   The hybrid electric vehicle control system according to claim 1, wherein the function installed in the HCM is a function capable of at least controlling each of the control units.   The control system for a hybrid electric vehicle according to claim 1, wherein the HCM collates information from each control unit with an internal calculation value, and determines a state of each control unit from a collation result.   The hybrid electric vehicle according to claim 3, wherein after the HCM determines that the hardware failure of each control unit is based on a collation result, the control target unit of each control unit is shifted to a fail-safe process controlled by the HCM. Control system.   5. The control system for a hybrid electric vehicle according to claim 4, further comprising notification means for notifying a driver that each control unit is faulty when a hardware failure occurs in each control unit. The functions of each control unit installed in the HCM are as follows:
The function that each control unit can control each unit to be controlled to the minimum, the function that can directly write ROM constants necessary for control to the program, and the ROM constant that is difficult to write directly to the program are in the normal control state. The control system for a hybrid electric vehicle according to any one of claims 1 to 5, which is a function capable of acquiring a function by learning in the HCM based on the information.

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