초록 ▼

The net engagement pressure of a torque converter clutch having a negative slope capacity vs. slip characteristic is controlled to stably regulate the clutch slip, and thereby isolate engine torque perturbations from the vehicle driveline. The pressure is scheduled with a proportional term responsiv

The net engagement pressure of a torque converter clutch having a negative slope capacity vs. slip characteristic is controlled to stably regulate the clutch slip, and thereby isolate engine torque perturbations from the vehicle driveline. The pressure is scheduled with a proportional term responsive to transient slip speed deviations and an integral term responsive to steady state slip speed deviations. Feed forward terms responsive to the throttle changes which force steady state slip speed deviations act to increase the speed of response of the integral term.

대표청구항 ▼

In a motor vehicle including a clutch mechanism connected between input and output members of a fluid torque converter and adapted to transmit engine output torque, the clutching mechanism being characterized in that its torque capacity is inversely proportional to the slip speed between its input a

In a motor vehicle including a clutch mechanism connected between input and output members of a fluid torque converter and adapted to transmit engine output torque, the clutching mechanism being characterized in that its torque capacity is inversely proportional to the slip speed between its input and output members over at least a portion of the range of such slip speed, and a clutch actuating mechanism adapted to be supplied with fluid pressure for controlling the torque capacity of said clutch mechanism, a method of operation for controlling the slip speed of the clutch mechanism so as to avoid the transmission of transient engine output torque excursions therethrough, the method comprising the steps of: defining a desired slip signal corresponding to a desired level of clutch slippage for avoiding the transmission of said transient engine output torque excursions through the clutch mechanism, an actual slip signal corresponding to the actual slip speed of the clutch mechanism, and a slip error signal Es in accordance with the difference between the actual and desired slip signals; supplying fluid pressure to the clutch actuating mechanism in relation to the sum of a first relatively small magnitude clutch pressure command, and a second relatively large magnitude clutch pressure command; generating said first relatively small magnitude clutch pressure command as a proportional function of the slip error signal for any given value of desired slip, thereby to generate relatively small magnitude but substantially immediate changes in the pressure supplied to the clutch actuating mechanism when said transient engine output torque excursions produce changes in the actual slip; and generating said second relatively large magnitude clutch pressure command as an integral function of the ratio of the slip error signal to the desired slip signal, at least when the actual slip signal is less than the desired slip signal, thereby to generate relatively large magnitude but integral changes in the pressure supplied to the clutch actuating mechanism when changes in a steady state engine output torque produce changes in the acutal slip.