Interrelated power delivery controls – including engine control – Clutch control – With fluid drive
Patent
1995-12-27
1997-04-01
Marmor, Charles A.
Interrelated power delivery controls, including engine control
Clutch control
With fluid drive
477174, 477175, 477 46, B60K 4102
Patent
active
056161000
ABSTRACT:
An improved lockup control system for a lockup-type torque converter for automotive vehicle performs a coasting lockup control of a lockup clutch with minimized response delay of lockup releasing control and suppressed lockup releasing shock upon acceleration of the vehicle. The control system includes a controller that is operative when the driving condition of a vehicle as represented by the throttle valve opening and the vehicle speed is judged to belong to a lockup region. The controller reduces the differential pressure across the lockup clutch to a lower limit value within a range in which the clutch can be prevented from slips. Thus, when the vehicle is reaccelerated and the driving condition shifts out of the lockup region, the reduction amount of the differential pressure is minimized to mitigate the response delay in the lockup releasing control. The differential pressure is reduced gradually in the case of rapid acceleration to avoid occurrence of a lockup releasing shock, and instantaneously to a maximum value in the case of gradual acceleration when the lockup releasing shock is not a problem.
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Hayasaki Koichi
Sakai Hiromasa
Kwon Peter
Marmor Charles A.
Nissan Motor Co, Inc.
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