Additional Stiffness and Damping Adjustable Secondary Vibration Damping Hydroelectric Active Suspension and Working Method

Abstract

The invention discloses a secondary damping hydroelectric active suspension with adjustable additional stiffness and damping in the field of automobile suspension and its working method. It consists of a secondary damping structure with adjustable stiffness. The active force actuator includes an actuator hydraulic cylinder, a charge accumulator, a hydraulic pump / motor, and an electric generator / generator. The secondary damping structure includes a spring hydraulic cylinder, adjustable flow valve, spring accumulator, electromagnetic valve and gas storage tank, the active force actuator is connected in series with the oil-pneumatic spring. The second level of vibration reduction can effectively reduce the associated inertial force of the equivalent inertial mass of the first level of vibration reduction structure, and can easily adjust the working state of the adjustable throttle valve and solenoid valve according to the load state of the vehicle, and change the stiffness of the second level of vibration reduction structure and damping.

Description

technical field [0001] The invention belongs to the field of automobile suspension, and relates to an active suspension structure with adjustable stiffness and damping and a working method thereof, which can realize active vibration reduction for automobiles. Background technique [0002] Active suspension has great advantages in vehicle vibration reduction. It can adjust the output force of the active force actuator according to the driving conditions of the vehicle, so as to take into account the ride comfort and handling stability of the vehicle. At present, there are several types of active force actuators, such as linear motor type, hydraulic type, and rotary motor type. The linear motor type has the simplest structure and the highest energy conversion efficiency, but its disadvantage is that the continuous output force density is small. Hydraulic actuators are generally divided into flow-regulated and pressure-regulated types, which require an external power source, s...

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Problems solved by technology

In order to alleviate the problem that the equivalent inertial mass of the rotating motor actuator using a ball screw is too large, the Chinese patent application is 201810431437.9, which is entitled "An Active Suspension Using a Rubber Spring Coaxial with the Active Power Actuator" In the active suspension proposed in the literature, a rubber bushing spring is coaxially connected in series at the lower part of the active force actuator to form a two-stage damping rotating motor active suspension structure scheme. However, the dynamic deflection of the bushing spring needs to meet the rubber compression requirements. Therefore, it is necessary to reserve a certain bushing spring compression safety distance, resulting in a larger bushing spring, which in turn requires a larger suspension installation space between the vehicle body and the wheel. In addition, the damping stiffness of the additional rubber bushing spring is fixed. Unchanged, poor adaptability to vehicle driving conditions

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