Control device for automotive active steering system

Abstract

The invention relates to a control device for an automotive active steering system. The device comprises an AFS target rotating angle determining module, an assisted displacement motor adjusting module, an EPS target torque determining module, an assisted motor adjusting module and a coordination control module, wherein the AFS target rotating angle determining module is combined with the coordination control module to provide a target rotating angle value for the assisted displacement motor adjusting module; the EPS target torque determining module provides a target torque value for the assisted motor adjusting module; the coordination control module is communicated with an EPS control unit through a CAN bus; the AFS target rotating angle determining module comprises a target transmission ratio setting sub module, a target rotating angle calculating sub module and an expected heading angle speed calculating sub module, wherein the target transmission ratio setting sub module calculates a transmission ratio R according to the automotive speed u and an ideal angle transmission ratio curve; and the target rotating angle calculating sub module calculates a target rotating angle value theta m4d according to the rotating angle theta S of a steering wheel and the transmission ratio R.

Description

technical field The invention relates to a control device for an active steering system, in particular, the invention relates to a coordinated control device for an active front wheel steering system, an electric power steering system and an electronic stability program. Background technique Improving handling stability and steering portability is the development trend of automobile steering systems. At present, most domestic and foreign automobile manufacturers equip new models with power steering systems. The physical exertion of the driver is reduced and the comfort is improved. However, the system only provides power assist function, and cannot implement active steering according to the vehicle driving conditions and handling stability requirements, and cannot effectively compensate the driver's steering misoperation or external interference, so it cannot reduce the driver's spirit when driving at high speed burden. The published patent CN1749081A proposes an electric...

AI Technical Summary

Problems solved by technology

(1) Since the system is based on the traditional EPS, a set of variable gear transmission mechanism and a motor are added, which greatly increases the weight and moment of inertia of the steering system, which may reduce the sensitivity of the steering system, resulting in The response of the steering transmission mechanism is slow. When the steering wheel rotates at a high speed, the torque that the driver needs to apply will increase and the action time will also be prolonged;

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