Automatic transmission hydraulic circuit

Details Automatic transmission hydraulic circuit Automatic transmission hydraulic circuit

2000-04-10

2000-12-19

Marmor, Charles A

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

192 85R, 138 31, F16H 6104, F16D 1900, F16L 5504

Patent

active

061621471

ABSTRACT:
A hydraulic circuit for an automatic transmission operable to reduce time delay in shifting includes a source supplying pressurized fluid through a feed orifice and a charging circuit including an accumulator. The accumulator is downstream of the feed orifice, and operates to reserve pressurized fluid supplied by the source. The hydraulic circuit also includes a clutch circuit, downstream of the charging circuit, which has a clutch hydraulically actuated and operable to generate torque to shift the automatic transmission. A valve is interposed between the charging circuit and the clutch circuit to open a flow path therebetween to start a shift cycle of the clutch. When the valve is actuated, the pressurized fluid is released from the accumulator and flows to the clutch circuit to minimize delay in the shift.

REFERENCES:
patent: 4161895 (1979-07-01), Ushijima et al.
patent: 5050460 (1991-09-01), Sugano
patent: 5090270 (1992-02-01), Suzuki
patent: 5105922 (1992-04-01), Yant
patent: 5148834 (1992-09-01), Reinartz et al.
patent: 6065814 (2000-05-01), Nishii et al.

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