Variable-Assist SBW 2WS Conversion Mechatronic Control Systems

Abstract

An automotive M-F-M FPS, E-M-F-M EFPS or E-M EPS SBW 2WS conversion enhances steering performance and betters the feel of the steering and powersaving efficiency. It does so with conversion mechatronic control mechanisms that decrease the steering effort. An automotive FPS, EFPS or EPS SBW 2WS conversion mechatronic control system is joined to the M-F-M, E-M-F-M or E-M booster actuator, respectively. The intention of FPS, EFPS and EPS SBW 2WS conversion mechatronic control systems was originally, to reduce the steering effort when driving at low values of vehicle velocity and to provide a feedback loop for the proper steering reaction force when driving at high value of vehicle velocity. To reach those objectives, automotive velometers or speedometers are employed as vehicle velocity sensors to measure vehicle velocity according to any variations in the steering assist rate under circumstances differing between certain limits from steering manoeuvres at zero value of vehicle velocity to those at high values of vehicle velocity. Nevertheless, as vehicles became supplied with E-M booster actuators and smart E-M EPS SBW 2WS conversion mechatronic control systems, the affirmation for these systems initiated the diminution in power demands and superior performance. The important normal actions needed for SBW 2WS conversion mechatronic-control systems are listed in Table 4.2 [SATO 1995].