TCC, SLIP CONTROL OUTLINE [AY6A-EL, AY6AX-EL]

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• Based on output speed signals, signals from the PCM (engine speed and accelerator pedal depressing amount) and vehicle speed, smooth TCC control is achieved through linear control of the TCC control solenoid. In addition, the slip rate is detected and slip control is achieved by adding input rpm signals.

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• By sliding the TCC piston when TCC is in the OFF range, slip control extends the TCC range to low vehicle speeds. This suppresses a rise in engine speed and increases transmission efficiency, improving fuel economy. At the same time, through the sliding of the TCC piston, engine vibration can be absorbed by the torque converter. (However, this assumes that ATF JWS3309 is used.)

Control

Description

TCC control

• Control is performed using a TCC control solenoid. The TCC control solenoid is linearly turned ON and OFF, the TCC clutch inside the torque converter is operated, and the pump impeller and turbine runner are connected. This enables coupling of the engine and the automatic transmission. Engine output is connected directly to the automatic transaxle, eliminating transaxle loss and enhancing fuel economy.

Slip control

• Control is performed using a TCC control solenoid. The TCC control solenoid is linearly turned ON and OFF and the TCC piston within the torque converter is operated outside of the TCC range. The TCC piston slides without being in a completely coupled condition, increasing transmission efficiency and enhancing fuel economy. However, because the sliding of the TCC piston places a load on the ATF, it is assumed that ATF JWS3309 is used.