Caterpillar Inc.

Caterpillar Sarl

Caterpiller Inc.

John J Kaufman

Edward William Mate

Michael D Hudson

Adam Adeeb

Dennis Ray Barber

Gerard O McCann

John Chapman

Josh Nolke

Neil Taylor

Eric P Jakubiak

Roger Tansley

Moses Imo Akpan

Scott D Vollmer

Susan E Bieker

Tony Maughan

Joseph E Tabor

Braking system includes a brake, first valve that actuates the brake based on user input, second valve configured to selectively actuate the brake, and valve actuation system including a user input device moveable between first and second positions. A brake sensor provides a signal indicative of actuation of the first valve. The valve actuation system activates the second valve if the user input device is in the first position and the first valve engaged, retaining the second valve in active state if the first valve is disengaged, deactivating the second valve if the user input device is in the second position.

Braking system and method for machine

A hydraulic fan circuit is provided. The hydraulic fan circuit includes a tank, a motor having a fluid inlet and a fluid outlet and a pump to draw fluid at a low pressure from the tank and discharge the fluid at elevated pressures to the motor via the fluid inlet. The hydraulic fan circuit further includes a directional control valve disposed between the fluid outlet of the motor and the tank. The directional control valve is operable to move between a flow blocking position and a flow passing position. Further, the directional control valve is configured to reduce a positive speed of the motor below a lowest positive speed attainable through control of pump output. Furthermore, the hydraulic fan circuit includes a pressure control circuit configured to provide a pilot fluid flow at varying pressure to move the directional control valve.

Hydraulic system having low speed operation

An antilock brake system for a vehicle may include a controller that is linked to a brake pedal sensor. The brake pedal sensor may be linked to a brake pedal. The brake pedal may be coupled to a normally closed brake pedal valve. The brake pedal valve may include an inlet in communication with a source of pressurized hydraulic fluid and an outlet in communication with a normally opened isolation valve. The isolation valve may be in communication with one or more main control valve systems and may be linked to a controller which maintains the isolation valve in a closed position during normal operating conditions. The isolation valve then shifts to an open position in the event current supply by the controller is interrupted as a result of an electrical failure or malfunction of the controller.

Electrohydraulic antilock brake system with isolation valve

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Yorkville, IL, United States of America

John J Kaufman