Hydraulic control apparatus for V-belt type continuously...

Details Hydraulic control apparatus for V-belt type continuously... Hydraulic control apparatus for V-belt type continuously...

2007-05-01

2007-05-01

Charles, Marcus (Department: 3682)

Endless belt power transmission systems or components

Pulley with belt-receiving groove formed by drive faces on...

Load responsive

C474S028000, C477S045000

Reexamination Certificate

active

10661825

ABSTRACT:
There is provided a hydraulic control apparatus for a belt CVT, which is comprised of a pulley pressure control section that controls the line pressure in accordance with the oil amount balance of an oil pump based on the engine speed and the oil temperature during a select-judgment period from the detection of a change from a driving range to a non-driving range or a change from the non-driving range to the driving range to the lapse of a predetermined period of time, or when the non-driving range is detected. This eliminates the possibility that the oil pump cannot generate a specified oil pressure due to a decrease in the engine speed. Further, the secondary pressure is multiplied by the ratio of the line pressure in accordance with the oil amount balance of the oil pump to the line pressure which has been intended to be specified, and the secondary pressure is controlled according to the calculation result. This makes it possible to maintain the pulley ratio without causing a down-shift of the belt CVT.

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Relevant portion of European Search Report of corresponding European Application EP 03 25 5490.

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