CN-122008767-A - Five-link rear suspension system and control method thereof

Abstract

The invention relates to the technical field of vehicle suspension systems, in particular to a five-link rear suspension system and a control method thereof. The five-link suspension mechanism is used for connecting a wheel with a vehicle body, the motor is integrated at a wheel hub of the wheel as a wheel hub motor, the upper end of the torque push rod is connected with the vehicle body through a rotary bearing, the lower end of the torque push rod is connected with the rotor output end of the motor through a joint bearing, and the shock absorber and the spring are arranged at the rear part of a tire and are connected between the vehicle body and the five-link suspension mechanism. The invention aims to solve the technical defect that the existing five-link suspension system lacks of integrated hub motor driving and active suspension functions.

Inventors

• ZHONG XIAOMIN
• HUANG JIAMING

Assignees

• 英迪高(上海)科技有限公司

Dates

Publication Date

20260512

Application Date

20260121

Claims (10)

1. 1. A five-bar rear suspension system comprising: five-bar suspension mechanism, motor, torque push rod, shock absorber and spring; The five-link suspension mechanism is used for connecting wheels and a vehicle body; The motor is integrated at the hub of the wheel as a hub motor; the upper end of the torque push rod is connected with the vehicle body through a rotary bearing, and the lower end of the torque push rod is connected with the rotor output end of the motor through a joint bearing; The shock absorber and the spring are arranged at the rear part of the tire and are connected between the vehicle body and the five-link suspension mechanism; wherein the motor is configured to drive the torque pushrod in its axial direction to produce a controlled telescoping force that ultimately acts on the damper to achieve an active suspension function by controlling the output torque of its rotor.
2. 2. The five-bar rear suspension system of claim 1 wherein the five-bar suspension mechanism comprises two upper arms, two lower arms and one toe arm.
3. 3. The five-bar rear suspension system of claim 2 wherein one of the upper and lower arms includes a pair of upper and lower cross arms arranged in parallel configured to maintain the torque rod at a constant vertical angle during wheel bounce.
4. 4. The five-bar rear suspension system of claim 2 wherein one of the upper and lower arms includes a pair of upper and lower trailing arms, the arrangement of the upper and lower trailing arms being configured to cooperatively maintain the angle of the torque pushrod in a vertical direction constant during wheel runout.
5. 5. The five-bar rear suspension system of claim 1 wherein the swivel bearing is configured to allow the torque pushrod to rotate about its own axis and the knuckle bearing is a ball and socket structure.
6. 6. The five-bar rear suspension system of claim 1 wherein the motor is a dual stator single rotor axial flux motor.
7. 7. The five-link rear suspension system of claim 6 wherein a motor torque pushrod is provided at a rotor output end of the dual stator single rotor axial flux motor, and a lower end of the torque pushrod is connected to the motor torque pushrod through the knuckle bearing.
8. 8. A method of controlling the five-bar rear suspension system of any one of claims 1-7, comprising the steps of: Acquiring a vehicle state signal; calculating a rotor target torque to be output by the motor based on the vehicle state signal and the real-time geometric posture of the torque push rod; Controlling the motor to output the rotor target torque; The rotor target torque is converted into an axial driving force to the torque push rod through an output end of the rotor target torque, and the axial driving force is transmitted to adjust the load born by the shock absorber, so that the vehicle body posture is actively controlled.
9. 9. The method of claim 8, wherein the vehicle condition signal comprises one or more of a vehicle body vertical acceleration, a vehicle body lateral acceleration, a wheel runout displacement, and a steering angle.
10. 10. The method of claim 8, wherein the vertical angle of the torque rod is constant during wheel runout.

Description

Five-link rear suspension system and control method thereof Technical Field The invention relates to the technical field of vehicle suspension systems, in particular to a five-link rear suspension system and a control method thereof. Background The five-link suspension is a suspension structure consisting of two upper arms, two lower arms and one toe arm, and can effectively resist forces in the longitudinal, transverse and vertical directions of the wheel, so that the stability and smoothness of the wheel are ensured. The five-link suspension has the advantages of flexible structure, and capability of adjusting the size and shape of each link according to different vehicle types and working conditions so as to achieve optimal suspension geometry and dynamics characteristics. The steering performance is good, the rear wheel steering or the follow-up steering can be realized, and the steering response and the steering stability of the vehicle are improved. The comfortable performance is good, the impact and noise of the road surface can be effectively isolated, and the riding comfort and quietness are improved. However, the existing five-link suspension system has the technical defect that firstly, the conventional five-link suspension arrangement mode cannot meet the low and flat design requirement of the rear floor, and particularly in the application of electric logistics vehicles and MPV vehicles, the suspension structure occupies excessive space. Second, the prior art lacks a solution for efficient integration of in-wheel motor drive and active suspension functions. Finally, the existing suspension system generally lacks active damping control capability, and the suspension characteristics cannot be adjusted in real time according to the running state of the vehicle, so that the comprehensive performance of the vehicle under different working conditions is limited. Disclosure of Invention The invention aims to solve the technical defect that the existing five-link suspension system lacks of integrated hub motor driving and active suspension functions. In order to achieve the above purpose, the invention adopts the following technical scheme: According to a first aspect of the invention, there is provided a five-link rear suspension system comprising a five-link suspension mechanism for connecting a wheel with a vehicle body, a motor integrated as an in-wheel motor at a hub of the wheel, a torque pushrod having an upper end connected to the vehicle body via a swivel bearing and a lower end connected to a rotor output end of the motor via a knuckle bearing, a damper and a spring disposed at a rear portion of a tire and connected between the vehicle body and the five-link suspension mechanism, wherein the motor is configured to drive the torque pushrod to generate a controlled telescopic force in an axial direction thereof by controlling an output torque of a rotor thereof, the force ultimately acting on the damper to realize an active suspension function. Alternatively, the five-bar suspension mechanism includes two upper arms, two lower arms, and one toe arm. Alternatively, the two upper arms and the two lower arms include a pair of upper and lower cross arms arranged in parallel configured to maintain the angle of the torque rod in the vertical direction constant during wheel runout. Alternatively, one of the two upper and lower arms includes a pair of upper and lower trailing arms, the arrangement of the upper and lower trailing arms being configured to cooperatively maintain the angle of the torque pushrod in a vertical direction constant during wheel runout. Alternatively, the rotary bearing is configured to allow the torque pushrod to rotate about its own axis, and the knuckle bearing is of spherical hinge construction. Alternatively, the motor is a dual stator single rotor axial flux motor. Optionally, a motor torque push rod is arranged at the rotor output end of the double-stator single-rotor axial flux motor, and the lower end of the torque push rod is connected with the motor torque push rod through the joint bearing. According to a second aspect of the present invention, there is provided a method for controlling the five-link rear suspension system, comprising the steps of obtaining a vehicle state signal, calculating a rotor target torque to be output by the motor based on the vehicle state signal and a real-time geometrical attitude of the torque pushrod, controlling the motor to output the rotor target torque, and converting the rotor target torque into an axial driving force to the torque pushrod through an output end thereof, wherein the axial driving force is used for adjusting a load borne by the shock absorber, thereby actively controlling a vehicle body attitude. Optionally, the vehicle status signal includes one or more of a vehicle body vertical acceleration, a vehicle body lateral acceleration, a wheel runout displacement, and a steering angle. Alternatively, the vertical angle of