A self-powered vehicle active suspension and its coordinated control method

Abstract

The invention discloses a self-powered type vehicle active suspension which comprises an actuator, a spring, a power module circuit, a super capacitor and a controller; the actuator and the spring are arranged between a vehicle body and a vehicle bridge in parallel; the input end of the controller is connected with a sprung mass speed sensor and an unsprung mass speed sensor; the actuator is composed of a piston barrel, a linear motor unit, a variable damping unit, an upper lifting lug, a lower lifting lug, a piston barrel upper end cover and a piston barrel lower end cover; the linear motor unit is composed of a piston rod and a plurality of permanent magnets; a partition plate is arranged in the piston barrel; a plurality of silicon steel sheets and a plurality of primary windings are arranged in the piston barrel between the piston barrel upper end cover and the partition plate; the variable damping unit is composed of a piston and a damping liquid channel; and a plurality of proportional electromagnetic valves are arranged on the damping liquid channel. The invention also discloses a coordinated control method of the self-powered type vehicle active suspension. The self-powered type vehicle active suspension is high in working stability, reliability, energy reclaiming efficiency and real time and can be in the optimal vibration attenuation state.

Description

technical field [0001] The invention belongs to the technical field of vehicle suspension systems, and in particular relates to a self-powered vehicle active suspension and a coordinated control method thereof. Background technique [0002] Passive suspension is widely used on vehicles. Since the suspension spring stiffness and shock absorber damping cannot change with the road surface and vehicle driving conditions, the design can only ensure that it meets the vibration reduction requirements under certain driving conditions. Passive suspension Suspension cannot fundamentally solve the contradiction between vehicle ride comfort and handling stability, which limits the further improvement of vehicle performance, and has become one of the key bottlenecks in current vehicle design and development. Active suspension is to adjust the parameters of the suspension in a timely manner according to the movement state and road conditions of the car, so that it is in the best vibration...

AI Technical Summary

Problems solved by technology

[0003] However, the energy self-supply active suspension actuators in the prior art still have defects such as complex structure, slow response, poor reliability, high energy consumption, and high cost. The goals of vehicle ride comfort and operational stability may worsen the driving condition; most of the existing invention patents do not consider that when the electromagnetic actuator fails, the suspension performance will become very bad, and the vehicle's The handling and smoothness deteriorate, and in severe cases, it will affect the driving safety; and the theme of energy feeding and energy saving is not considered as much as possible in the case of improving ride comfort

In addition, the control methods of energy self-supply active suspension actuators in the prior art often focus on a certain aspect of the performance of the active suspension, without the overall performance of the comprehensive energy self-supply active suspension actuator, resulting in the actuator being The active control effect is not obvious during the working process, and the switching speed between the energy feedback mode and the active control mode is too frequent, which causes a serious hysteresis effect in the system and has a great impact on the life of the battery; The control method of the motor speed in the device needs to be improved, and the existing technology cannot make the active suspension in the best vibration reduction state.

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