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AISIN SEIKI CO., Ltd. Started the production of electronically controlled hydraulic automatic transmissions for medium-duty trucks and buses in 1989. The number of vehicles on the Japanese market in which this system is adopted is increasing steadily. After re-examining market needs, AISIN SEIKI CO., Ltd. has newly developed an electronically controlled hydraulic automatic transmission A580 which focuses on improved input capacity, driving performance and fuel economy for medium-duty trucks and buses and lessens learnt from experience.

In this report we focus on development of smaller and lighter ECUs for Automatic Trans-Missions (ATM). Specifically, we describe the development of ECUs that utilize: detailed printed wire patterns, bare chip semiconductors with wire bonding technology, and many small Surface Mounting Devices (SMDs), on a metal based board with high heat dissipation. In comparison with our current products, we have achieved: (1) a 58% reduction in size, (2) a 63% reduction in weight, and an extended thermal range of operation. These new ECUs are suited for the severe environment of the engine compartment.