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A NEW TYPE FUEL FLOW SENSOR which is based upon heat transfer principle has been developed for automotive applications. The fuel flow sensor presented in this paper utilizes temperature sensitive resistors made of extremely thin platinum films, and is located in the main passage of a conduit opposite to a nozzle. An extraordinarily wide dynamic range and a quick response have been obtained in comparison with conventional methods. The hot film type fuel flow sensor could allow a new microprocessor to control the engine functions, as well as a fuel consumption or a fuel rate meter.

This paper describes the onboard data acquisition system for truck and bus which has been developed by Mitsubishi Electric Corp. and Mitsubishi Motors Corp. This system, which is called MCVOCS (Mitsubishi Commercial Vehicle Operation Control System), records various vehicle operating data and provides much valuable information for both a driver and a fleet owner. For example, it may serve for fuel economy and effective operational management. The main purpose of this paper is to describe the system configuration and the data acquisition software of the system.