Machine element or mechanism – Gearing – With fluid drive
Patent
1991-10-15
1993-01-19
Braun, Leslie A.
Machine element or mechanism
Gearing
With fluid drive
74890, 192 358, 192 8713, B60K 4122
Patent
active
051798743
ABSTRACT:
The present invention provides a hydraulic control system for the automatic transmission of a vehicle. The control system utilizes only one pulse width modulating solenoid valve to provide modulated pressure (P2) to whichever of the torque transfer devices constitutes the single, on-coming torque transfer device required to effect a desired drive ratio. The control system includes a plurality of cascaded relay valves each of which is controlled by a respective solenoid valve. A pressure control gate is interposed between the single, pulse width modulating solenoid valve and the plurality of cascaded relay valves in order to provide modulated pressure (P2), or, selectively, main line pressure (P1) to the various torque transfer devices of the transmission. The solenoid valve are controlled to select which of the torque transfer devices shall be actuated by modulated pressure (P2) and which shall receive line pressure (P1). In addition, the control actuates a torque converter clutch with modulated pressure (P2) and maintains engagement thereof by main line pressure (P1) through selected drive ratios.
REFERENCES:
patent: 4376473 (1983-03-01), Tomasek et al.
patent: 4391166 (1983-07-01), Kubo et al.
patent: 4603603 (1986-08-01), Salmon
patent: 4855913 (1989-08-01), Brekkestran et al.
patent: 4936430 (1990-06-01), Shikata
patent: 5007309 (1991-04-01), Lemon et al.
patent: 5063813 (1991-11-01), Lentz
Braun Leslie A.
General Motors Corporation
Navarre Mark A.
Trousdell William O.
LandOfFree
Hydraulic control system for vehicular automatic transmissions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulic control system for vehicular automatic transmissions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic control system for vehicular automatic transmissions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-97495