Method of duty-ratio control for hydraulically actuated slip con

Details Method of duty-ratio control for hydraulically actuated slip con Method of duty-ratio control for hydraulically actuated slip con

1988-04-11

1990-08-14

Look, Edward K.

Motors: expansible chamber type

Miscellaneous

91429, 91459, 74867, 192 329, 192 33, 192 331, B60K 4102, B60K 4104, B60K 4122, F16H 6114

Patent

active

049477340

ABSTRACT:
A hydraulic control method which includes a step of changing the time rate of introduction per a predetermined unit time of pressurized oil into an oil passage connected to a hydraulically-operated load device, such as a clutch of an automatic transmission, from a first time rate to a second time rate, thereby changing the time-based average oil pressure inside the oil passage from a first oil pressure value to a second oil pressure value. The time rate of introduction of the pressurized oil into the oil passage is changed from the first time rate to the second time rate via a third pressurized oil introduction time rate corresponding to a third oil pressure value different from the first and second oil pressure values. If the second oil pressure value is greater than the first oil pressure value, the third pressurized oil introduction time rate is substantially 100%. If the second pressure value is smaller than the first, the third time rate is substantially 0%. Preferably, the step of pressurized oil introduction into the oil pressure at the third pressurized oil introduction time rate is followed by at least one step of introducing the pressurized oil into the oil passage at a pressurized oil introduction time rate corresponding to an oil pressure value different from the third oil pressure value. Preferably, the pressurized oil introduction time rates are temperature-corrected in accordance with the pressurized oil temperature.

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