Caterpillar Sarl

Caterpillar Inc.

Naoto Funabiki

Matthew James Beschorner

Isao Murota

Eric Hughes

Brett J Janson

Shota Hoshaku

Tomohiro Oyama

To reduce load on the operator and to establish traveling stability in the steering operation of a construction machine that has a pair of right and left traveling devices, and an engine as a driving power to the right and left traveling devices, a controller is provided which is responsive to a switch for traveling to drive or stop both a right and a left traveling devices. A switch for steering causes the controller to change the direction of travel of the construction machine, and the controller also acts to reduce the engine speed in accordance with the operation amount of the switch for steering.

Travel control system of construction machine

This invention provides to set plural test patterns in which two or more control valves are picked up from the plural control valves as diagnosis target, and there being installed a malfunction diagnosis means () in which the diagnosis of malfunctioned valve is applied to the test patterns as unit, and malfunction valve identification means () in which the malfunctioned valves are identified by checking the control valves one another, that control valves are included in the test patterns having been diagnosed whether malfunction exists or not by the malfunction diagnosis means ().

Control valve diagnostic system in hydraulic circuit

A control system for a machine is disclosed. The control system may have a bypass passage situated to allow fluid to bypass an actuator, and a warmup valve disposed within the bypass passage that is movable between flow-passing and-blocking positions. A controller is configured to move the warmup valve to the flow-passing position, fix a displacement position of the pump, compare the pressure of the fluid of the actuator with a threshold, and move the warmup valve to the flow-blocking position and reduce a pump outlet pressure when the pressure of the fluid is greater than the threshold. The controller may be configured to move the warmup valve to the flow-passing position, fix a displacement position of the pump, and adjust an input speed of the pump in response to the signal.

Machine control system having hydraulic warmup procedure

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Tokyo, Japan

Naoto Funabiki