Patent ID: 6146311
Filing Date: 2000-11-14
Classification: F16D,F16H,Y10T

Abstract:
A hydraulic circuit for an automatic transmission operable to reduce time delay shifting, comprising a source supplying pressurized fluid through a flow restricting, feed orifice, a charging circuit including an accumulator, downstream of said feed orifice, including a fluid reservoir to reserve pressurized fluid supplied by said source, and having a variable volume capacity, a clutch circuit, downstream of said charging circuit, including a clutch hydraulically actuated and operable to generate torque to shift the automatic transmission, and a valve interposed between said charging circuit and said clutch circuit, operable to open a flow path therebetween to start a shift cycle of said clutch, where upon actuation of said valve, the pressurized fluid is released from said accumulator and flows unrestricted to said clutch circuit to minimize delay in the shift and wherein said fluid reservoir accommodates fluid from said source during the shift thereby controlling the rate of pressure increase in said clutch and thus controlling the rate of torque capacity increase during the shift.