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Ride quality is an important purchasing consideration for consumers. It is typically defined in terms of noise, vibration and harshness. These phenomena are a result of vibrations caused at the engine/powertrain and from the road surface, which are transmitted to the passenger cabin. To minimize such vibrations, rubber parts are used extensively at mounting points for the cabin, such as engine mountings and suspension bushings. The vehicle development process increasingly requires performance testing, including rubber parts using CAE, prior to prototype evaluation. This in turn requires a rubber material model that can accurately describe dynamic characteristics of rubber components, particularly frequency and amplitude dependency.

A Combustion Pressure Sensor (CPS) has been developed to measure combustion pressure in an engine cylinder. The CPS has been installed in the advanced TOYOTA lean burn engine for a Japanese commercial car on Oct. 1992. The control system with the CPS is useful for improvement of fuel consumption efficiency and emission of the commercial car. The CPS was installed in the first cylinder of the engine and measures the combustion pressure. In this system, the engine torque caused by a cycle combustion was calculated with the pressure signal of the sensor in real time. The sensor was especially designed to detect the lean burn limit with torque variations by means of unstable combustions. The CPS for the lean burn control system realizes advanced performances, durability, reliability, with the minimum components and the reasonable cost. This paper shows the structure and characteristics of the CPS, in detail.