A vehicle suspension system including a negative stiffness device and its control method

Abstract

The invention provides a vehicle suspension system including a negative stiffness device and a control method thereof, including a detection mechanism, a control unit and an actuator; the actuator includes a hydraulic pump, a solenoid valve a, a solenoid valve b, a solenoid valve c, and a solenoid valve d and a negative stiffness device; the negative stiffness device includes a left cylinder and a right cylinder; the left cylinder and the right cylinder are respectively symmetrically installed on both sides of the vehicle body. Both the left cylinder and the right cylinder include a cylinder body, a piston and an elastic element; the elastic element is arranged in the cylinder body, and the push rod of the piston is hinged with the vehicle body; the bottom of the cylinder body is hinged with the chassis frame. When the vibration amplitude of the vehicle body is small, the suspension and the negative stiffness device can be used together to reduce the natural frequency of the vehicle, thereby improving the ride comfort of the vehicle. When the vibration amplitude of the vehicle body is large, the electronic control unit ECU actively controls the negative stiffness device not to work, so as to avoid affecting the ride comfort of the vehicle. The stiffness of the negative stiffness device in the invention is flexible and adjustable, and can be adjusted in real time according to the driving road conditions, thereby improving the ride comfort of the vehicle.

Description

technical field [0001] The invention belongs to the technical field of vehicle suspension, and in particular relates to a vehicle suspension system including a negative stiffness device and a control method thereof. Background technique [0002] Suspension is an important assembly in a car. It elastically connects the frame and the wheel, can transmit the force and torque acting between the wheel and the frame, and buffer the shock transmitted to the frame or body from the uneven road. Impact force, and reduce the vibration caused by it, so as to ensure that the car can run smoothly. The suspension has a great influence on the ride comfort and handling stability of the vehicle. In recent years, with the development of science and technology, people pay more and more attention to ride comfort, and the requirements for the suspension performance of automobiles are constantly improving. The negative stiffness device is used in conjunction with the suspension to achieve quasi-...

AI Technical Summary

Problems solved by technology

However, this device does not consider the adjustment of the initial state. The negative stiffness device cannot guarantee that it will not affect the vehicle when the body is in a balanced position, and cannot fully play the role of the negative stiffness device.

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