Method for adapting a torque converter lock-up clutch
AssigneeZF Friedrichshafen AG
InventorBernd Zimmermann
Life of this patent
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Abstract
For a torque converter lock-up clutch (7) a method is proposed in which an application pressure is adapted. To this end, within a first interval, a pressure change is output after a transition function and the existence of the reaction of the torque converter lock-up clutch is tested after output of the application pressure during an application phase from an electronic gear control (13). In the absence of reaction, additional intervals are then output. The application phase is then terminated when the reaction of the torque converter lock-up clutch occurs. The control/regulating phase for the torque converter lock-up clutch (7) follows after the application phase terminates.
Claims7
A method of adaptation of a torque converter lock-up clutch (7) of an automatic transmission comprising a) upon detection of the requirement of a change of state of said torque converter lock-up clutch an electronic gear control (13) outputs an application pressure (p0), during a control/regulating phase of a state change of said torque converter lock-up clutch (7), b) said electronic gear control (13) detects, from revertive variables, a reaction of said torque converter lock-up clutch (7) and therefrom determines an adaptation value for the application pressure (p0), c) after output of the application pressure (p0) there follows an application phase for said torque converter lock-up clutch (7), wherein d) during the application phase said electronic gear control (13) outputs, within a first interval (T(1)), a pressure change after a transition function and tests the existence of the reaction of said torque converter lock-up clutch (7), e) in the absence of reaction outputs additional intervals (T(i), i =2, 3, . . . n) wherein said electronic gear control (13) within said additional intervals (T(i), i =2, 3, . . . , n) outputs a pressure change based on the pressure at the end of the previous internal (T(i−1), i +2, 3, . . . , n) after the same transition function and f) the application phase terminates when a reaction of said torque converter clutch (7) occurs;
- said electronic gear control (13) thereafter continuing with the control/regulating phase.
Dependencies are inferred from the claim text.