Characteristics of electromagnetic clutch hydraulic power steering for heavy vehicles

Hydraulic power steering (HPS) is generally used in heavy vehicles. For the purpose of reducing the energy consumption of HPS as well as improving high-speed stability and low-speed maneuverability of heavy vehicles, the electromagnetic clutch hydraulic power steering (ECHPS) is proposed, which is characterized by an electromagnetic clutch to control the steering pump. The electromagnetic clutch consisting of primary motor, secondary motor and slip power recovery device is designed and modelled with ANSOFT. Simulation results show ECHPS enhances high-speed stability and low-speed maneuverability of heavy vehicles in steering condition and reduces energy consumption in straight running condition. The prototype of primary motor, which is the key part of ECHPS, is developed and tested. Test results verify the performance of primary motor and the accuracy of electromagnetic clutch design. ECHPS can both guarantee the variable assist characteristic and energy-saving ability of heavy vehicles.