eps electronic control unit

Abstract

The invention discloses an electronic control unit of an EPS system. The electronic control unit comprises a power module, a control module, a pre-drive module and a peripheral circuit, wherein the power module can provide multiple power sources which do not affect each other, the power module is provided with an external hardware watchdog circuit to monitor a fault of the voltage of each power source and a self-power-on initial diagnostic function, and if the power module diagnoses the fault, the control module and the pre-drive module are forbidden to work; the control module only uses one multi-core MCU with a verification core, and the MCU can execute different commands on the same assembly line, in the same stage and at the same moment; the pre-drive module is provided with a fault diagnosis protection function and can communicate with the control module through an SPI to conduct fault processing; and the peripheral circuit comprises a redundant peripheral circuit and a detectionand diagnosis peripheral circuit, the redundant peripheral circuit conducts redundant protection on signals of the EPS system, and the detection and diagnosis peripheral circuit detects and diagnosesfaults of the signals of the EPS system. The electronic control unit of the EPS system is high in integration level, low in production cost and capable of meeting the ASIL-D standard.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to an electronic control unit of an EPS (electronic power steering system). Background technique [0002] EPS (Electric Power Steering System) mainly uses the motor to provide steering assist torque, and acts on the steering column through the deceleration mechanism and the steering torque applied by the driver, so as to provide corresponding assist for the driver according to different vehicle conditions. Electric power steering system structure such as figure 1 As shown, the traditional mechanical steering system (mainly including steering wheel 1, steering column 4, intermediate shaft 5, steering tie rod 7, steering gear 8, pinion 9, steering knuckle arm 10, steering wheel 11) is equipped with a rotation angle sensor 2 , reduction mechanism 3, torque sensor 6, power steering motor 12 and electronic control unit 13 etc. composition. [0003] EPS is a safety component in automobiles, a...

AI Technical Summary

Problems solved by technology

Although the EPS loaded in the past has certain safety considerations, due to technical limitations, it cannot fully meet the requirements of ISO26262ASIL-D. On the one hand, the relevant hardware architecture (such as communication, control, and feedback) cannot be realized.

On the other hand, many integrated chips that can meet the ASIL-D standard are expensive and cannot meet the requirements of mass production.

In addition, the awareness of ASIL-D is a gradual process of maturity. Although the concept of ASIL-D was proposed very early, there is currently no EPS product in China that has passed ASIL-D certification.

Images