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We have developed an effective secondary air-injection system that reduces harmful substances such as HC and CO. The secondary air in this system is heated to 300°C and injected into the exhaust pipe. Though the temperature of the secondary air is relatively low, it can activate a three way catalyst more rapidly than conventional secondary air injection systems. Thus, in our system (a “Heated-Air-Injection System”) is expected to be very effective in reducing harmful substances in the cold transient phase of the US Federal Test Procedure. For designing the system and analyzing its performance, we developed a simulation model including the design parameters of the system, such as flow rate of heated air, heater power, and so on. Besides these design parameters, the model takes into account of heat transfer from exhaust gas to exhaust pipe, gas-conversion reactions in a three way catalyst, and heat transfer efficiency of the electric heater.

This paper presents an example of a centralized remote control system for car audio equipment. We present the way by which all car audio equipment except the operation switches and the display can be removed from the drivers site. The ploblems and technology to achieve this remote control system are described. Especially the division methode of the car audio system and the various data transmission technology between separate units are described.

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.

A new liquid crystal display module integrating a LC cell of reflective type, printed circuits and a driver IC on a piece of plastic (polyethersulfone) is developed for automotive dashboard instrumentation. The module, which includes an LC cell with 22 leads to display, can be interfaced directly to a microprocessor with only 8 external leads. The module is flexible so that compact assembly with the systems is possible.

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.

An LCD instrument panel, which displays a vehicle’s speed, an engine revolution, a fuel level and a coolant temperature, in digital or bargraph form on a single, large area LCD, has been developed. In adapting electronic items to the instrument panel, a single chip 8-bit microcomputer which manages most of the signal processing with excellent software techniques, a specially designed LCD driver IC and some hybrid-ICs have been employed. In this way, a minimised electronic assembly and a very suitable display were designed so that mass-production became possible.

An instrument panel of a large area liquid crystal display (LCD), including a 50 segment bargraph speedometer, a six digit odo/trip/tacho meter, two gauges and several warning indicators, has been developed. The LCD cell evaluated for this instrument panel is operated in a reflective twisted nematic mode and dimensions of the cell are 260 × 110 × 3 mm. The liquid crystal material is capable of operating over a wider temperature range from −30°C to 80°C and the response time is less than 1 second at −20°C without heaters. The LCD instrument panel can display in multi-color by using high performance dichroic polarizers. Finally feasibility of the large area LCD instrument panel is investigated.