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This paper deals with energy-saving and its thermal advantage in a hydraulic power steering system. Currently, hydraulic power steering systems are commonly used for passenger cars, and reduction of the driving energy of the pump under non-steering condition is important for energy-savings of the system to improve fuel economy. This paper describes a newly designed energy-saving pump and its experimental results. The energy-saving pump has lower driving torque with the advantage of lower heat generation in the power steering system. In addition, relationships between the pump driving energy and oil temperature in the system are analyzed for the basis of the mathematical model, which accurately predicts the pump driving torque.

This wire/busbar type junction block consists of busbar layers and a wire layer used for the output circuits. The wire layer is assembled onto the lower cover. The wire connects to a terminal which leads out of the cover for connection. Circuit routing is easy to change in this type of junction block (J/B); especially when compared to the traditional busbar type J/B. Because changing the wire routing is easy, many different vehicles can use the same J/B and development time is short. Fewer busbar layers result in a reduction in busbar tooling and weight of the J/B.