Torque Converter Clutch (TCC)

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In a standard torque converter, the impeller (2) and turbine are rotating at about the same speed and the stator (3) is freewheeling, providing no torque multiplication. By applying the turbines piston and friction material (9) a total converter engagement can be obtained. The result of this engagement is a direct 1:1 mechanical link between the engine and the transmission.

HYDRO-MECHANICAL AND ELECTRICAL

The Torque Converter Clutch (TCC) is engaged and released by the Transmission Control Module Assembly (TCMA). The TCC can be engaged and controlled in any forward gear from 1 through 8. In addition, the 8HP transmission incorporates a neutral idle control (NIC) function. Instead of the engine continuing to drive the converter when the vehicle comes to rest, the converter is partially disconnected from the driveline so only a slight residual load remains. Decoupling of the torque converter during NIC is accomplished by allowing clutch B to slip.