Machine element or mechanism – Gearing – Interchangeably locked
Patent
1995-12-20
1997-04-01
Wright, Dirk
Machine element or mechanism
Gearing
Interchangeably locked
F16H 6104
Patent
active
056155786
ABSTRACT:
A hydraulic pressure control system for a frictional engagement element such as clutches for a vehicle automatic transmission. The engagement state of the clutches, i.e., the normality of clutch state or operation is discriminated by detecting the degree of clutch engagement (clutch slippage), specifically by calculating a ratio between the input rotational speed and the output rotational speed, and by comparing the calculated ratio with the gear ratio designated by the shift command at that time. When the clutch is found to be normal, the hydraulic pressures on the releasing and engaging clutches are controlled for temporarily bringing the total torque transferred by the two clutches below the transmission input torque, i.e., for reducing the co-engagement amount to the required minimum. On the other hand, when it is ascertained that the clutch is not normal, the hydraulic pressures of the two clutches are controlled in a conventional manner.
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Furukawa Hideo
Ohashi Tatsuyuki
Honda Giken Kogyo Kabushiki Kaisha
Wright Dirk
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