eps control module and its control system and control method
A control module and control system technology, applied in transportation and packaging, electric steering mechanism, vehicle components, etc., can solve the problems of low timeliness, increased software processing complexity, and high priority
Active Publication Date: 2021-06-08
SAIC MOTOR +1
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Problems solved by technology
[0009] ① From the perspective of data interaction between MCU and SBC, only SBC transmits fault information status to MCU, and the timeliness of MCU's periodic SPI frame master node access is extremely low, lacking real-time error reporting from SBC to MCU on hardware data flow signal line
[0010] ②When the program on the MCU side runs away, to a certain extent, the correctness of the software call and control logic of each module on the closed path of "Alarm_X->SMU->ISR->GPIO" cannot be guaranteed, and the interrupt service ISR A higher priority will interrupt SysMgm's record keeping process for failures
[0011] ③ From the perspective of software complexity, since the MCU is passively reset by the SBC, it is difficult for software processing to diagnose and process the SBC fault information in the SPI frame in the same software running cycle, and often it can only be run after restarting Then read the fault information in the Alarm_X related registers that are not lost due to power failure on the MCU side, thus increasing the complexity of software processing
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[0075] Such as figure 2 As shown, an embodiment of the EPS control module provided by the present invention, the first connection hard line S1 is added between the safety management unit SMU of the single-chip MCU of the EPS control module and the fault monitoring unit Error Monitor of the system basis chip SBC, and the single-chip MCU A second connection hard line S2 is added between the input and output function module GPIO and the security state control unit SSC of the system basis chip SBC. Theoretically, various signals can be transmitted on the first connecting hard line S1 and the second connecting hard line S2, and the signals involved in this application are named as follows: the signal transmitted on the first connecting hard line S1 is named the first signal SS1, The signal transmitted on the second connection hard line S2 is named as the second signal SS2.
[0076] The safety management unit SMU sends protocol signals to the fault monitoring unit Error Monitor, a...
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The present invention provides a kind of EPS control module, the safety management unit SMU of single-chip microcomputer MCU of this EPS control module and the fault monitoring unit Error Monitor of system basic chip SBC add the first connection hard line S1, the input and output function module GPIO of single-chip microcomputer MCU A second connection hard line S2 is added between the security state control unit SSC of the system basis chip SBC. The present invention also provides an EPS control system using the EPS control module and an EPS control method. The invention can ensure that when the program runs abnormally, the hardware shuts down the path to realize the action of turning off the power assist, reduces the interrupt response and fault confirmation time, and greatly shortens the system response time while increasing reliability. In the present invention, the function call for processing fault records and the fault time are relatively isolated in two software operation cycles before and after, and the time-consuming operation of saving and erasing records for general software processing is also transferred to the software operation cycle after the MCU restarts, effectively reducing errors. possibility of treatment.
Description
technical field [0001] The invention relates to the field of automobiles, in particular to an EPS (electric power steering system) control module. The present invention also relates to an EPS control system and an EPS control method. Background technique [0002] Electric Power Steering (EPS) is a power steering system that directly relies on the motor to provide auxiliary torque. Compared with the traditional hydraulic power steering system HPS (Hydraulic PowerSteering), the EPS system has many advantages. EPS is mainly composed of torque sensor, vehicle speed sensor, electric motor, deceleration mechanism and electronic control unit (ECU). [0003] Such as figure 1 As shown, the traditional EPS system power-off solution in the field of electronic control of the existing automobile chassis is described as follows: [0004] 1. EPS electronic control system, the main components include a single-chip microcomputer (MCU) responsible for the main control function, system basi...
Claims
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IPC IPC(8): B62D5/04
CPCB62D5/0481
Inventor 张善孟永刚张宗哲罗来军芦勇陈惠
Owner SAIC MOTOR