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An active suspension system controls a spring constant and an attenuater in real time using a power supply. Generally, the hydraulic pressures are used for transmitting the power. Therefore, a highly reliable and inexpensive control system has been required for a commercial use. This has been achieved by developing a mechanical fluid servo valve which comprises a simple combination of a solenoid valve and a spool valve. The technical problem of the valve vibrations has been solved through the numerical analyses, the fluid flow visualization tests and the vehicle tests.

This paper reports a development of a balanced vane pump which utilizes a cam ring and plates with the most suitable configuration to drastically reduce its flow ripple output which is converted into pressure pulsation and finally acoustic noise. This pump, developed for vehicles with power steering mechanisms through computer simulation technology, is a low-pulsation pump with a small number of vanes, which has been difficult to construct for noise problems. The theoretical basis for the technique is presented, along with an example of pump design using a vane-raising speed control.