Bi-directional double-pulse driver for DC steering motor in vehicle steering-by-wire system

Abstract

The invention discloses a bidirectional double-pulse driver for a DC steering motor of a vehicle steering system by wire, which receives a forward and reverse direction signal and a forward and reverse pulse signal, and sequentially performs optocoupler isolation and NOT gate level conversion on each signal; OR logic operation is performed on the converted forward direction signal and reverse pulse signal to generate a forward enable signal; OR logic operation is performed on the transformed reverse direction signal and forward pulse signal to generate a reverse enable signal; The forward enable signal and the transformed forward pulse signal are the input of the forward half-bridge drive chip; the reverse enable signal and the transformed reverse pulse signal are used as the input of the reverse half-bridge drive chip; the forward half-bridge The output of the bridge driver chip and the reverse half-bridge driver chip controls the H-bridge main circuit. The present invention adopts the combined configuration of dual-channel pulse signals and dual-channel direction signals to realize the driving of the DC steering motor, which can reduce system energy consumption and improve the tracking precision of wire-controlled steering.

Description

technical field [0001] The invention relates to the technical field of vehicle-by-wire steering systems, in particular to a bidirectional double-pulse driver for a DC steering motor of a vehicle-by-wire steering system. Background technique [0002] The vehicle steering-by-wire system cancels the traditional mechanical connection between the steering wheel and the wheel steering gear. It can flexibly and actively drive the wheel steering according to the requirements of vehicle handling and stability control. It has good dynamic control characteristics and is a hot technology. The steer-by-wire system is driven by a steering motor, and the performance of the steering motor drive control performance directly affects the performance of the steer-by-wire system. In order to charge the bootstrap capacitor, the existing single-pulse signal drives the forward and reverse half-bridge drivers. During the low level of the PWM signal (pulse width modulation signal), the low-bridge arm...

AI Technical Summary

Problems solved by technology

In order to charge the bootstrap capacitor, the existing single-pulse signal drives the forward and reverse half-bridge drivers. During the low-level period of the PWM signal (pulse width modulation signal), the low bridge arms on both sides are turned on, so that the motor is in a braking state, which is not conducive to Achieve high-precision position control and increase unnecessary energy consumption

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