Vehicle launch using a transmission clutch
AssigneeFord Global Technologies, LLC
InventorsDavor D. Hrovat, Michael G. Fodor, Hong Jiang, Ian Oldknow, Jahan Asgari
Life of this patent
Estimating the term…
Abstract
A method for controlling a transmission input clutch during a vehicle launch includes determining a desired clutch torque, a desired engine torque, a desired vehicle acceleration and a desired engine speed, determining a change in clutch torque and a change in engine torque with reference to the first and second errors and current operating conditions, applying to the clutch an updated clutch torque capacity whose magnitude is the sum of the desired clutch torque and the change in engine torque, and producing an updated engine torque whose magnitude is the sum of the desired engine torque and the change in engine torque.
Claims13
A method for controlling a clutch during a vehicle launch comprising:
- (a) determing commanded clutch torque and commanded engine torque using respective errors between vehicle acceleration and desired vehicle acceleration, and between engine speed and desired engine speed;
- (b) changing clutch capacity to a sum of desired clutch torque and the commanded clutch torque;
- (c) changing engine torque to a sum of desired engine torque and the commanded engine torque.
A method for controlling a transmission input clutch during a vehicle launch comprising the steps of:
- (a) using open loop control to determine a desired clutch torque, a desired engine torque, a desired vehicle acceleration and a desired engine speed;
- (b) determining a first error between the desired vehicle acceleration and current vehicle acceleration;
- (c) determining a second error between the desired engine speed and current engine speed;
- (d) using closed loop control to determining a commanded clutch torque and a commanded engine torque with reference to the first and second errors;
- (e) applying to the clutch an updated clutch torque capacity whose magnitude is the sum of the desired clutch torque and the commanded clutch torque;
- and
- (f) producing an updated engine torque whose magnitude is the sum of the desired engine torque and the commanded engine torque.
A method for controlling a transmission input clutch during a vehicle launch comprising the steps of:
- (a) using open loop control to determine a desired clutch torque, a desired engine torque, a desired vehicle acceleration and a desired engine speed;
- (b) determining a first error between the desired vehicle acceleration and a current vehicle acceleration;
- (c) determining a second error between the desired engine speed and a current engine speed;
- (d) using closed loop control to determining a commanded clutch torque and a commanded engine torque with reference to the first and second errors;
- (e) applying to the clutch an updated clutch torque capacity whose magnitude is the sum of the desired clutch torque and the commanded clutch torque;
- and
- (f) producing an updated engine torque whose magnitude is the sum of the desired engine torque and the commanded engine torque;
- (g) determining the desired clutch torque that emulates performance of one of a viscous coupling, a hydraulic torque converter and a hydraulic coupling.
Dependencies are inferred from the claim text.