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An electrohydraulic power steering system controlled based on vehicle speed and load signals

A technology of hydraulic power steering and load signal, which is applied in the direction of electric steering mechanism, steering mechanism, steering rod, etc., which can solve the problems of unstable steering system and control unit operation that cannot be changed according to external information, and achieve the effect of improving accuracy

Inactive Publication Date: 2011-12-07
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the change of the load applied to the vehicle makes the operation of the control unit unable to change according to the external information, resulting in the instability of the steering system

Method used

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  • An electrohydraulic power steering system controlled based on vehicle speed and load signals
  • An electrohydraulic power steering system controlled based on vehicle speed and load signals
  • An electrohydraulic power steering system controlled based on vehicle speed and load signals

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Embodiment Construction

[0011] see figure 1 , the present invention includes a steering control unit 9 for controlling the actuator, a DC motor 8, a steering hydraulic pump 7, an oil storage device 6 and a power steering cylinder 5. The steering hydraulic pump 7 is connected between the oil storage device 6 and the DC motor 8; the steering hydraulic pump 7 is connected with the rotary valve 4, and the rotary valve 4 is connected with the steering power cylinder 5, the steering fluid flows through the steering valve 4, and the steering valve 4 is controlled by the steering Controlled by the unit 9, the steering valve 4 controls the pushing direction of the power steering cylinder 5 to realize pushing in different directions. The DC motor 8 is connected to the steering control unit 9 through a drive circuit 18 . The oil storage device 6 provides steering fluid to the steering hydraulic pump 7, and the drive circuit 18 controls the rotation speed of the output shaft of the DC motor 8. The output shaft ...

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Abstract

The invention discloses an electro-hydraulic power steering system for an engineering mechanical vehicle based on vehicle speed and load signal control. A steering hydraulic pump of the electro-hydraulic power steering system is connected with a rotary valve and is connected between an oil storage device and a direct current motor; the rotary valve is connected with a power-assisted steering oil cylinder; the direct current is connected with a steering control unit through a driving circuit; the steering assisted cylinder is connected with a steering gear plumbing arm; the other end of the steering gear plumbing arm is connected to a steering knuckle arm through a steering straight pull rod; the steering knuckle arm is connected with wheels; a wheel rotary angle sensor, a vehicle speed sensor, a steering shaft load sensor, a steering wheel rotary angle sensor and a torque sensor are respectively connected with a steering control unit; both the vehicle speed and the load are consideredin the whole control system; the steering control unit is controlled by closed loop feedback; the defects that a steering force is insufficient or over great caused by incomplete signal acquisition is prevented; the precision of steering control is improved; and the aim of saving energy is achieved.

Description

technical field [0001] The invention relates to a hydraulic power steering system of an engineering machinery vehicle driven by a motor, and is also suitable for other automobile hydraulic power steering systems. Background technique [0002] The power source of the traditional hydraulic power steering system to drive the oil pump comes from the engine. The hydraulic pump is used to establish a certain pressure, and the flow of the pressure flow is controlled by the control valve. The steering system is controlled by the rotary valve or slide valve according to the driving state of the vehicle. Because the traditional hydraulic power steering system is driven by engine power, the output flow of the oil pump cannot be adjusted and controlled. If the designed oil flow rate is large, it can meet the requirements of lightness at low speed, but it will cause poor hand feeling at high speed. If the oil flow rate is small, the opposite is true. Therefore, it is difficult to coordin...

Claims

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Application Information

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IPC IPC(8): B62D5/06B62D5/04B62D6/00B62D101/00B62D131/00B62D113/00B62D119/00
Inventor 何仁陈勇刘文光
Owner JIANGSU UNIV
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