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The purpose of this paper is to study the flow field of a lockup clutch inside a torque converter. The performance of a torque converter has been one of the most important areas of improvement for an automobile equipped with an automatic transmission. Improving the torque converter's performance and efficiency are key contributions to saving fuel, which is an important consideration with the recent increase in environmental awareness. Moreover, the lockup operation- or slipping control- of an automatic transmission is another good opportunity for improving fuel economy.

The “idling stop” of the vehicle, which is defined as no rotation of the engine when it stops, theoretically brings to reduce the fuel consumption (i.e. carbon dioxide) and the exhaust emissions. However, the idling stop practically has weak points as follows: 1. When the engine is restarted, much fuel is consumed. 2. When the engine is restarted, much the exhaust emissions are discharged. 3. While various electric devices work, the load of the battery is high. 4. The deterioration of the lubricating oil proceeds due to repeating start and stop. In order to overcome the above weak points the authors propose the new system called IISS.