BACK UP HYDRAULIC SYSTEM FOR STEER-BY-WIRE SYSTEM

摘要

Back up hydraulic system for providing hydraulic fluid to a steer-by-wire system. The steer-by-wire system comprises a hydraulic steering actuator (21), a hydraulic pump (31) driven by an engine (29), and an electronically controlled valve (24) controlling fluid flow to the hydraulic steering actuator (21). The back up hydraulic system comprises a back up pump (189, and a back-up supply duct (19) for coupling the back up pump (18) to a supply duct (27) of the hydraulic steering actuator (21). Furthermore, a back up controller (16) may be provided for driving the electric motor (15), the back up controller (16) being arranged to detect a malfunction of the engine (29).