Traveling control system for hydraulically driven vehicle

Motor vehicles – Power – Including traction motor of kind driven by noncompressible...

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60445, B60K 2600

Patent

active

057092826

ABSTRACT:
A traveling control system for a hydraulically driven vehicle enables the vehicle to travel at a higher speed and also enables a vehicle body to be braked appropriately when the vehicle descends a slope with a travel control valve kept in its neutral position. The traveling control system includes pressure switches for detecting an operative state of a travel control valve, a detection line for detecting a shift position of a transmission, and a controller, a solenoid valve, load lines, a shuttle valve and a control line for cooperatively increasing the capacity of a travel motor upon the detection of that the travel control valve is in its neutral position and also the transmission is shifted to a high-speed gear. A timer function of the controller allows the capacity of the travel motor to be increased after the elapse of a predetermined time after the detection of that the travel control valve is in the neutral position. The load lines and the shuttle valve jointly serve as a hydraulic source for switching the motor capacity.

REFERENCES:
patent: 4240515 (1980-12-01), Kirkwood
patent: 4241577 (1980-12-01), Baldauf
patent: 4350220 (1982-09-01), Carman
patent: 4530416 (1985-07-01), Kasai
patent: 4554992 (1985-11-01), Kassai

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