| 摘要 |
A lock-up control system for a torque converter, in a vehicle transmitting a driving torque of a prime mover to wheels via a power transmission unit including the torque converter which can establish direct coupling between an input element and an output element. The lock-up control system has an accelerator releasing detecting portion for detecting releasing of an accelerator for operating the prime mover, a lock-up range detecting portion for detecting a vehicle traveling condition falling within a lock-up range for establishing direct coupling of the input and output elements of the torque converter by means of a lock-up clutch, a lock-up progressing portion for progressing direct coupling between the input and output element of the torque converter by engagement of the lock-up clutch in response to the accelerator releasing detecting means and the lock-up range detecting means, when the vehicle traveling condition enters into the lock-up range, a coasting capacity detecting portion for detecting an engaging capacity of the lock-up clutch as progressing establishment of lock-up state, reaching a coasting capacity required for coasting of the vehicle, and a coasting capacity maintaining portion for holding the engaging capacity of the lock up clutch by interrupting progress of engagement of the lock-up clutch when the engaging capacity reaching the coasting capacity is detected.
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