System for and method of controlling lockup clutch
AssigneeJATCO Ltd
InventorNaonori Iizuka
Life of this patent
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Abstract
A control system for a lockup clutch measures an actual time required from start of engagement of the lockup clutch until completion of engagement of the lockup clutch, and sets a reference time required from start of engagement of the lockup clutch until completion of engagement of the lockup clutch. The system modifies a change rate of the duty ratio to the time so as to reduce a difference between the actual time and the reference time.
Claims4
A method of controlling a lockup clutch, the lockup clutch allowing connection of a pump impeller side with a turbine runner side in a hydraulic power transmission, the lockup clutch being controlled by a solenoid having a duty ratio which, upon engagement of the lockup clutch, is changed continuously and in accordance with a time by a control means, the method comprising the steps of:
- measuring an actual time required from a start of engagement of the lockup clutch until a completion of engagement of the lockup clutch and generating an actual time indicative signal indicative of said actual time measured;
- setting a reference time required from said start of engagement of the lockup clutch until said completion of engagement of the lockup clutch and generating a reference time indicative signal indicative of said reference time set;
- and
- modifying a change rate of the duty ratio so as to reduce a difference between said actual time indicative signal and said reference time indicative signal.
A system for controlling a lockup clutch, the lockup clutch allowing connection of a pump impeller side with a turbine runner side in a hydraulic power transmission, the lockup clutch being controlled by a solenoid having a duty ratio which, upon engagement of the lockup clutch, is changed continuously and in accordance with a time by a control means, the control system comprising:
- means for measuring an actual time required from a start of engagement of the lockup clutch until a completion of engagement of the lockup clutch and generating an actual time indicative signal indicative of said actual time measured;
- means for setting a reference time required from said start of engagement of the lockup clutch until said completion of engagement of the lockup clutch and generating a reference time indicative signal indicative of said reference time set;
- and
- means for modifying a change rate of the duty ratio so as to reduce a difference between said actual time indicative signal and said reference time indicative signal.
Dependencies are inferred from the claim text.