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Semi-active suspension is one of many effective devices to improve vehicle stability, controllability and riding comfort. A practical means to realize semi-active suspension is to vary the damping force of the shock absorber. In this paper, we propose a new type of shock absorber using a piezoelectric sensor and actuator. The piezoelectric sensor and actuator are built into the piston rod which is a part of the shock absorber. The piezoelectric element provides a fast response and a high actuation force. We used the piezoelectric element in shock absorbers in order to take advantage of these two features. High level compatibility between stability, controllability and riding comfort is expected, since damping force changes very quickly using this new type of shock absorber. In this paper, several topics are discussed. First, a general description of the damping force control system with simple configuration is explained.

Introduced herein is an electronic control system for controlling a fuel quantity and an injection timing of an in-line fuel injection pump by the use of microcomputers and a servo mechanism for a high precision positioning of a control rack. In the system a new control method of atmospheric pressure compensation is applied. The method maintains engine performance steady under any atmospheric pressure. A digital servo based on the modern control theory is employed as a servo mechanism for positioning the control rack in the fuel quantity control so that capability of the servo system is enhanced.