A torque converter lockup clutch control apparatus operates a lockup clutch to provide a controlled degree of slip between the converter cover and the turbine hub. Cylinder output sensors are provided for monitoring outputs produced in the respective cylinders of an internal combustion engine. The monitored...http://www.google.com.au/patents/US5226513?utm_source=gb-gplus-sharePatent US5226513 - Torque converter lockup clutch control apparatus
