Ford Motor Company Limited

Ford Global Technolgoies, LLC

Eldon L Goates

Kenneth G Walega

John A Daubenmier

Charles Edward Marshall

Robert Clayton Roethler

A rotary switch, used to select the operating range of an automatic transmission, controls solenoid-operated valves corresponding to the selected range to open and close a connection between a range valve assembly and a control pressure source. A forward range selection electric circuit includes a forward range high side driver, a solenoid-operated control valve, the rotary switch, a power source, and a current monitor. There is a similar circuit for the reverse range. A forward range valve and reverse range valve respond to control pressure produced by the circuit to open a fluid pressure source to a line that is pressurized to produce forward drive, a second position opens a connection between the fluid pressure source and a line that is pressurized to produce reverse drive and vents those lines to sump.

Operating range selection of an automatic transmission

An electronically actuated park control system for an automatic transmission for a wheeled vehicle including a transmission range selection control assembly that sends to a powertrain control module a park signal, the module being adapted to deliver an output signal to a park controller circuit for actuating electric actuator motors which activate a mechanical transmission park mechanism, the motors having position feedback monitoring features as the transmission park mechanism is engaged or disengaged, the controller and the park controller circuit having inherent design redundancies as well as independent watchdog circuitry that ensure that transmission park release or park application responds precisely to transmission range selector requests by the driver.

Integrated electronic control of pawl-gear park function of an automatic

A bypass pressure regulator valve, having first and second regulator ports connected to a sump and each port supplied from the output side of a first and second pump, regulates the magnitude of line pressure in response to a control pressure produced by a variable force solenoid. A high pump feed select valve alternately connects the output of the first pump and the sump to the inlet of the second pump. Output from the first pump is directed through a torque converter clutch pressure regulator valve and a converter charge pressure regulator valve to a first inlet of the torque converter causing the torque converter to open and to a second inlet causing the torque converter to close. Hydraulic fluid is directed to lubrication circuits and through a transmission oil cooler.

Regulation of hydraulic pressure in a system having multiple pressure

A rotary switch, used to select the operating range of an automatic transmission, controls solenoid-operated valves corresponding to the selected range to open and close a connection between a range valve and a control pressure source. The valve has three positions and is centered by one compression spring. One position opens the fluid pressure source to a line that is pressurized to produce forward drive, a second position opens a connection between the fluid pressure source and a line that is pressurized to produce reverse drive, and a third position vents those lines to sump. The spring locates the valve at the center position and makes the valve insensitive to tolerances and spring variations. For example, the range valve will not move until a predetermined control force is applied at either end of the valve spool.

The reverse shift mechanism for a manual transmission includes a gear selector shaft driveably connected to a guide rail having a selector finger rotatable among several shift and axially displaceably to gear engagement positions within each shift plane. A reverse lever, pivotably supported on the transmission casing pivotally supports a camming pawl guided rotatably on a fixed post located within a slotted hole in the pawl. The lever is continually engaged with reverse idler which is moved between position of engagement and disengagement with a reverse pinion and reverse output gear the pawl defines a camming surface contacted by the selector pin and a recess for engaging the selector pin as it moves from the neutral position to the reverse drive position the selector pin disengages the recess and camming surface when it moves from the neutral position to the fifth speed position.

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Livonia, MI, United States of America

Eldon L Goates