Lock-up control system for torque converter
AssigneeJATCO Ltd
InventorsShinya Toyoda, Hironobu Waki
Life of this patent
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Abstract
A lock-up control system for a torque converter which includes a lock-up clutch engageable under control of an engaging capacity of the lock-up clutch to thereby lock up input and output elements of the torque converter. The control system is operative during coasting in a lock-up region requiring engagement of the lock-up clutch, so as to bring the engaging capacity of the lock-up clutch to a coast lockup capacity smaller than a lock-up capacity under a driving condition at the same vehicle speed. The control system is further operative when an engine braking range is selected during coasting in the lock-up region, so as to bring the engaging capacity of the lock-up clutch to a value greater than the coast lock-up capacity, preferably to a controlling maximum value.
Claims7
A lock-up control system for a torque converter including a lock-up clutch engageable under control of an engaging capacity of the lock-up clutch to thereby lock up input and output elements of the torque converter;
- said control system being operative during coasting in a lock-up region requiring an engagement of the lock-up clutch for bringing the engaging capacity of the lock-up clutch to a coast lockup capacity smaller than a lock-up capacity under a driving condition at the same vehicle speed;
- said control system being further operative when an engine braking range is selected during coasting in the lock-up region, for bringing the engaging capacity of the lock-up clutch to a value greater than the coast lock-up capacity.
A lock-up control system for a torque converter of an automatic transmission, including a lock-up clutch engageable under control of an engaging capacity of the lock-up clutch to thereby lock up input and output elements of the torque converter, said automatic transmission including a range changeover means for effecting changeover between a non-engine-braking range and at least one engine-braking range, said lock-up control system comprising:
- a lock-up clutch control means being operative during coasting in a lock-up region requiring engagement of the lock-up clutch, for bringing the engaging capacity of the lock-up clutch to a coast lockup capacity smaller than a lock-up capacity under a driving condition at the same vehicle speed;
- said lock-up control means being further operative when it is judged that said range changeover means is operated in the lock-up region to effect changeover into an engine braking range, for bringing the engaging capacity of the lock-up clutch to a value greater than the coast lock-up capacity.
Dependencies are inferred from the claim text.