Abstract
This paper shows the energy saving power steering system, which was named as KEEPS (Kayaba Electronic Controlled Energy Saving Power Steering). In a conventional hydraulic power steering system, the hydraulic pump always supplies enough quantity of oil to the hydraulic circuit. This extra oil flow increases driving torque of the pump, thus the hydraulic power steering system wastes energy. On the other hand, KEEPS can control oil flow electrically in accordance with the condition of a vehicle. In the measurement test for energy consumption of the power steering system with the actual vehicle on test courses, KEEPS got 48% less at city mode, 41% less at highway mode and 39% less at country mode compared with the conventional hydraulic steering system.
