| Shock absorber is an important part of vehicle chassis system to attenuate the vibration and its performance directly influence the ride comfort and control stability of vehicles. When oil flows through the valve block and clearance, damping is created by shock absorber to absorb the vibration energy, converting it into heat energy and dissipate it into the air. Through analysis and calculation, this part of vibration energy is very considerable. The temperature of shock absorber will rise when it works frequently. Both the performance of shock absorber and the ride comfort will be influenced and even causes safety loophole when the temperature reaches the limits. In this paper, the vibration energy generated is recycled by energy-regenerative shock absorber by turning it into electrical energy and storing in the batteries to supply automotive electrical system. Meanwhile, the system generates damping by controlling the electromagnetic torque of the generator.In this paper, the working principle and structure of the energy-regenerative shock absorber are analyzed; the characteristic parameters of the shock absorber are determined, based on the vehicle parameters of a off-road vehicle, the generating characteristics of the shock absorber are analyzed theoretically, and the semi-active control scheme based on the mechanical characteristics of the energy-regenerative shock absorber is derived to guarantee the highest generation efficiency; a circuit model, designed to do generation control, is build, which keeps the generator voltage in the safe range and charges the battery.Model simulations on different road levels are made, based on the 1/4 vehicle model of the off-road vehicle, the vehicle riding comfort and the energy recovery efficiency of the system are analyzed, and the effect, which the vehicle parameters and the generator parameters have on the energy recovery efficiency of the system, is analyzed at the same time, then it provides the theoretical basis for the parameter selection in the future. Compared with the traditional suspension, the effect on the amplitude-frequency characteristics of the energy-regenerative suspension, produced by the inertia quality of the energy-regenerative shock absorber, is analyzed. Against the problem that the energy recovery is limited even on the good road conditions, this paper proposes a solution, that is, the system can recognize the road spectrum effectively, by extracting the response signal of the vehicle’s vertical vibration acceleration directly. And this can provide a theoretical basis for the improvement of the energy-regenerative shock absorber’s structure in the future. |
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