Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine
Patent
1993-06-28
1995-07-04
Marmor, Charles A.
Interrelated power delivery controls, including engine control
Transmission control
Transmission controlled by engine
475128, F16H 6100, F16H 6108
Patent
active
054295602
ABSTRACT:
A valve (36) for controlling pressure supplied to a friction clutch (32) of an automatic transmission includes several valve spools (38,40,44) each formed with control lands located within a bore (42) opening to various ports (60,66,68,72,76,80) that are supplied selectively with line pressure depending upon the operating state of the transmission. The valve operates in a primed condition, whereby a predetermined low pressure is supplied continually to the friction clutch. The valve supplies the clutch with a higher pressure that operates to stroke the clutch cylinder and friction element and thereafter regulates clutch pressure in accordance with changes in pressure in one of the ports. The clutch is stroked rapidly because the valve provides a relatively unrestricted supply of pressurized fluid through one of its inlet ports. After the clutch free-pack clearances are taken up, the valve restricts the clutch stroke against a cushion spring by opening the clutch cylinder to an orificed supply circuit. A delayed response to a change in operating state of the valve is minimized such that the control lands of the valve spools do not fully open line pressure supplied to the valve.
REFERENCES:
patent: 3014383 (1961-12-01), Flinn
patent: 4090417 (1978-05-01), Burcz et al.
patent: 4145937 (1979-03-01), Shindo et al.
patent: 4462279 (1984-07-01), Sumiya
Hydra-Matic 4L80-E Technician's Guide, Nov. 1990, General Motors Corporation.
VanSelous Joseph S.
Weidman Kenneth G.
Ford Motor Company
Grabow Troy
Marmor Charles A.
May Roger L.
McKenzie Frank G.
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