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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.

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.