Intelligent hydraulic suspension unit and control method thereof

Abstract

The invention discloses an intelligent hydraulic suspension unit and a control method thereof. The intelligent hydraulic suspension unit comprises a hydraulic cylinder, a digital throttling valve, an energy accumulator, a detection module, a controller, a hydraulic pump and an oil tank, wherein the hydraulic cylinder adopts a three-cavity dual-piston single-piston-rod structure, a cylinder body of the hydraulic cylinder is connected with a frame through a frame support, a piston rod of the hydraulic cylinder is connected with wheels through a wheel support, the digital throttling valve and the energy accumulator are configured to realize semi-active control, and a digital directional valve, the hydraulic pump and the oil tank are configured to realize active control. The controller realizes semi-active control through damping control and realizes active control through force and displacement compound control. The intelligent hydraulic suspension unit and the control method thereof have the advantages that the semi-active control and the active control on the suspension unit are realized through intelligent control, a hydraulic medium, wear-out and creeping phenomena of a sealing ring of the hydraulic cylinder, failure of a buffer mechanism as well as fatigue failure and wear-out failure of the piston and the cylinder body are effectively monitored, the operation state of the hydraulic cylinder is judged actively, the service life of the hydraulic cylinder is prolonged, the reliability of the hydraulic cylinder is improved, and the intellectualization of a hydraulic suspension is realized.

Description

technical field [0001] The invention relates to a vehicle structure assembly, in particular to an intelligent hydraulic suspension unit and a control method thereof. Background technique [0002] Suspension is the general term for all force transmission connection devices between the frame and the wheels. It is an important part of the car. The torque is transmitted to the frame to ensure the normal driving of the car. The performance of the suspension device directly affects the driving safety of the car, and rollover accidents have become one of the reasons for serious traffic accidents. [0003] According to the correlation between damping and stiffness and vehicle driving conditions, suspension can be divided into passive suspension, semi-active suspension and active suspension. The stiffness and damping coefficient of the passive suspension are designed according to experience, which has great limitations. The active suspension performs dynamic self-adaptive adjustmen...

AI Technical Summary

Problems solved by technology

The stiffness and damping coefficient of the passive suspension are designed according to experience, which has great limitations. The active suspension performs dynamic self-adaptive adjustment according to the changes of road conditions and vehicle motion state, so that the suspension is in the optimal motion state, but there is energy consumption big disadvantage

Semi-active suspension only considers changing the damping of the suspension, and hardly consumes vehicle power, but its control characteristics are poor. When the road condition is poor, the suspension cannot be guaranteed to be in an optimal motion state.

[0004] The reliability of the suspension directly affects the driving safety of the car. The traditional suspension device cannot detect its own working state. It can only be found when a fault occurs, but the consequences of this are unimaginable. For example, the hydraulic cylinder is used as a hydraulic suspension device. The system cannot obtain parameters reflecting its operating status in real time, and cannot make timely judgments on seal ring wear, creeping phenomenon, buffer mechanism failure, cylinder and piston fatigue failure and wear failure, and cannot make timely judgments on failed hydraulic media. response

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