Electronically controlled hydrodynamic retarder with adaptive du

Details Electronically controlled hydrodynamic retarder with adaptive du Electronically controlled hydrodynamic retarder with adaptive du

1992-08-31

1994-10-04

Wright, Dirk

Interrelated power delivery controls, including engine control

Transmission control

With brake control

192 4B, 36442601, 477187, 477196, B60K 3100, B60T 826

Patent

active

053517954

ABSTRACT:
An electronically controlled hydrodynamic retarder interconnects with the output shaft of a vehicle transmission to selectively apply a braking torque thereto. The retarder includes a solenoid valve, the operating duty cycle of which controls the retarder capacity and resultant braking torque. A control unit, interconnecting the transmission and the retarder, regulates the duty cycle of the solenoid valve to regulate the retarder operation as a function of excessive deceleration or overheating, while also regulating such operation during downshift to assure efficient, effective, and comfortable operation of the transmission/retarder. The retarder is adaptive to accommodate variations resulting from age, wear, and the like.

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