Control apparatus for regulating engagement of a fluid operated torque transmitting device

A motor vehicle transmission control system for controlling the supply of fluid to a servo chamber of predetermined volume which is filled to engage a fluid operated torque transmitting device, said control system comprising;

• a source of fluid pressure;
• fluid restriction means including first and second alternate fluid circuits, and an electrically activated valve adapted to connect one of said fluid circuits between said fluid pressure source and said chamber;
• look-up means effective when it is desired to engage said fluid operated torque establishing device for determining a delay time in relation to a desired engagement time of said torque transmitting device;
• and
• control means for activating said electrically activated valve to connect said fluid pressure source to said chamber via said first fluid circuit during a first portion of the engagement, and after the expiration of an actual time period corresponding to said determined delay time, via said second fluid circuit, thereby to control the engagement time of said torque transmitting device to said desired engagement time.

A motor vehicle transmission control system for controlling the supply of fluid to a servo chamber of predetermined volume which is filled to engage a fluid operated torque transmitting device, said torque transmitting device being connected to transmit torque from a vehicle engine to a vehicle drive wheel, said control system comprising;

• a source of fluid pressure;
• fluid restriction means including a first fluid circuit for permitting a relatively high fluid flow, a second fluid circuit for permitting a relatively low fluid flow, and an electrically activated valve adapted to connect one of said first and second fluid circuits between said fluid pressure source and said chamber;
• look-up means effective when it is desired to engage said fluid operated torque establishing device for determining a first circuit time in relation to a desired engagement time of said torque transmitting device, said first circuit time comprising an empirically derived base component and a learned adaptive component;
• and
• control means for activating said electrically activated valve to connect said fluid pressure source to said chamber via said first fluid circuit during a first portion of the engagement, and after the expiration of an actual time period corresponding to said determined first circuit time, via said second fluid circuit.