A multi-mode steering control hydraulic system for a special purpose vehicle
A technology of steering control and hydraulic system, applied in steering mechanism, fluid steering mechanism, power steering mechanism, etc., which can solve the problems that the rear wheel cannot be in the absolute center position, signal deviation, and the absolute rotation angle of the front and rear wheels are inconsistent.
Active Publication Date: 2021-12-31
SHAANXI AUTOMOBILE GROUP
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- Application Information
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Problems solved by technology
[0004] Current problems: the solenoid valve element itself has neutral leakage, and the angle sensor detects the signal deviation of the angle signal, so that the rear wheel cannot be in the absolute centered position when it needs to work in the centered mode, so that the deviation will occur when driving in a straight line , but also accelerated the wear rate of the rear tires
When performing four-wheel centripetal or crab-shaped steering, due to the phenomenon of inconsistent loads on the front and rear wheels, the response speed of the rear wheel steering will be slow and cannot keep up with the response speed of the front wheel steering, resulting in inconsistent absolute rotation angles of the front and rear wheels at the same time
Method used
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Embodiment Construction
[0017] Such as figure 1 As shown, a special vehicle multi-mode steering control hydraulic system proposed by the present invention includes a fuel tank 1, a variable pump 2, a steering gear 3, a front wheel steering cylinder 4, a rear wheel centering cylinder 5, and a rear wheel steering cylinder 6 , Control valve group 7, accumulator 8, ECU controller 9, angle sensor 10.
[0018] Wherein, the variable variable pump 2, the steering gear 3, the front wheel steering cylinder 4, the rear wheel centering cylinder 5, the rear wheel steering cylinder 6, the control valve group 7, and the accumulator 8 form a hydraulic circuit;
[0019] The ECU controller 9 and the angle sensor 10 form an electrical control loop;
[0020] The steering gear 3 is connected to the oil port of the front wheel steering cylinder 4 to form a front steering circuit to realize left and right steering of the front wheels;
[0021] The control valve group 7 includes a first proportional solenoid valve 7-3, t...
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The invention discloses a multi-mode steering control hydraulic system for a special vehicle. The system includes a fuel tank 1, a variable pump 2, a steering gear 3, a front wheel steering assist cylinder 4, a rear wheel centering cylinder 5, a rear wheel steering assist cylinder 6, Control valve group 7, accumulator 8, ECU controller 9, angle sensor 10. By controlling the valve group 7 to control the rear wheel centering cylinder 5, the deviation phenomenon of the rear wheel in straight-line driving can be improved. Through the pressure compensator 7‑4 and the accumulator 8, the phenomenon of slow steering response speed of the rear wheels after steering mode switching is improved.
Description
technical field [0001] The invention relates to a multi-mode steering control hydraulic system for a special vehicle, in particular to a multi-mode steering control hydraulic circuit during the steering process of an aircraft tractor. Background technique [0002] The aircraft tractor is a special vehicle for pushing and pulling the aircraft, which has the characteristics of easy towing operation and large traction force. The main function of its multi-mode steering is to realize the requirements for turning radius under different working conditions. For example, the four-wheel centripetal steering mode is to keep the steering angle of the front and rear wheels of the tractor in the same direction, but in opposite directions, so that the turning radius can be minimized. State, enhance the maneuverability of the tractor. [0003] The current multi-mode steering hydraulic circuit of aircraft tractors such as figure 2 As shown, the steering gear 3' controls the front wheel st...
Claims
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IPC IPC(8): B62D5/06B62D5/065B62D5/08
CPCB62D5/062B62D5/065B62D5/08
Inventor 赵增耀魏占芳陈文斐金开陈文斌白子龙刘春强苗亮亮刘友红
Owner SHAANXI AUTOMOBILE GROUP