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AISIN AW has developed a five-speed automatic transmission “55-50SN” for front wheel drive (FWD) vehicles. This new 55-50SN has been developed with a concept to minimize length and mass increase compared with the current four-speed automatic transmission, and is one of the most compact five-speed automatic transmissions in the world. This has been accomplished by newly developed planetary gear sets, a new differential, and a new squeezed torque converter. In addition, the control system is made by a unique design to maintain the excellent compactness and to achieve a high quality smooth shift feeling. This paper describes the construction, characteristic, and function of this five-speed automatic transmission.

AISIN AW has developed a new transmission control module (hereinafter referred to as “TCM”), which can be applied to the world wide FWD 6-speed automatic transmission (hereinafter referred to as “A/T”). This newly developed TCM can contribute to the whole vehicle system as it is integrated to mechanical A/T in the meaning of ‘hardware’, and completed and ensured the functions in the A/T system. This TCM allows us to greatly reduce the number of the wire harness and the connector, and the space for installing TCM, which are required for the conventional style: A/T and TCM are separately installed, so that it can contribute to fuel economy, weight saving, utilization of the space in the engine room and cost reduction. Our Integrated TCM on A/T integrates the functions with the conventional neutral safety switch (hereinafter referred to as “N.S.S/W”) for detecting shift position, so that it allows compact installation to the limited space on A/T.