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Electric steering system

An electric steering system and steering control technology, applied in electric steering mechanism, power steering mechanism, steering mechanism, etc., can solve problems such as inability to meet, the steering system no longer provides assistance, and achieve the effect of ensuring vehicle safety

Pending Publication Date: 2019-04-30
SAIC GENERAL MOTORS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hydraulic pump of the hydraulic power steering system is directly driven by the engine belt, which cannot meet the needs of the development of the steering system of pure electric vehicles; because the existing electric power steering system is powered by a single motor, after the motor control circuit fails, the steering system will no longer provide power. , enter the mechanical steering mode

Method used

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  • Electric steering system

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Embodiment approach

[0023] According to an embodiment of the present invention, the motor is a three-phase permanent magnet synchronous motor, and the motor drive bridge circuit is a three-phase bridge circuit.

[0024] According to an embodiment of the present invention, the electric steering system further includes a steering wheel, a steering wheel torque and rotation angle sensor, and a wheel speed sensor.

[0025] According to an embodiment of the present invention, the steering wheel torque and rotation angle sensor is a dual power supply, four-channel digital torque signal and dual-channel digital steering wheel torque and rotation angle sensor.

[0026] According to an embodiment of the present invention, the wheel speed sensor is used to detect the wheel speed during the running of the vehicle, and is connected to the electronic brake control module through the wire harness, and the measurement result is input into the steering control module through the CAN bus, which facilitates Steer ...

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Abstract

The invention discloses an electric steering system. The electric steering system comprises: two motors used for steering and a steering control module used for controlling the motors, wherein two micro-control chips are integrated in the steering control module, and the micro-control chips are connected through an SPI bus for mutual verification; two motor pre-driving chips used for diagnosing faults of motor loops; and two driving loops, each driving loop comprising a micro-control chip and a motor pre-driving chip, and each driving loop independently controlling one motor. When one motor loop fails, the driving loop of the other motor is controlled to control the vehicle to steer so as to pull over; and when one driving loop fails, the other driving loop controls the vehicle to steer soas to pull over. The motors and the driving loops are arranged in a redundant mode and the micro-control chips are connected through the SPI bus, so that when one motor loop or one motor driving loopfails, the vehicle can be rapidly controlled to pull over so as to ensure the safety of the vehicle.

Description

technical field [0001] The invention relates to the field of automobiles, in particular to an electric steering system for a vehicle with an automatic driving function. Background technique [0002] At present, the existing road vehicle steering control system mainly adopts hydraulic power steering or electric power steering system. The hydraulic pump of the hydraulic power steering system is directly driven by the engine belt, which cannot meet the needs of the development of the steering system of pure electric vehicles; because the existing electric power steering system is powered by a single motor, after the motor control circuit fails, the steering system will no longer provide power. , to enter the mechanical steering mode. For the development of self-driving vehicles, it is still necessary to ensure that the vehicle has the ability to turn when the motor drive circuit fails, so that the vehicle can park safely. [0003] The traditional electric power assist system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/00B62D5/04
CPCB62D5/003B62D5/046B62D5/0481
Inventor 张瑞崔海峰
Owner SAIC GENERAL MOTORS
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