Prototyping, testing and control energy for active-regenerative electromagnetic shock absorber based quarter car model

In this paper, electromagnetic shock absorber for passenger car is designed and fabricated. Series of experiment is conducted to attain damping and current constant. Controllers are designed for energy regeneration and comfort based quarter car model. Shock absorber is designed and prototyped to absorb vibration energy and dissipate the energy as control actuation. The shock absorber use DC permanent magnet motor to absorb and dissipate power. Prototype is tested on Auto Damping Test Machine (ADFT). With the decreasing of external load, damping force and generated current are increased. Formulation of DC motor for electromagnetic damper is developed. Model of active-regenerative electromagnetic suspension and some controller strategies is simulated based to test results. Tracking reference, PI-tracking reference and Multi objective H∞ controller are presented and compared to determine their performance due to comfort, energy regeneration and consumption. Simulations are carried out with unevenness road input. Amount of regenerated energy is harvested when system at passive mode with high body acceleration. Multi objective controller is satisfy to maintain body acceleration, suspension travelling and tire deflection with minimum power requirement. PI-tracking reference controller has less body acceleration, suspension travelling and tire deflection compare to tracking and H∞ multi objective controller but it need the highest power consumption. Averages of RMS body acceleration are: 1.81, 0.59, 0.42, 0.46 m/sec2 respectively for passive, tracking reference, PI-tracking reference and multi objective H∞ controller and power consumption are: 49.58 Watt, 72.11 Watt, 51.49 Watt, respectively for tracking reference, PI-tracking reference and multi objective H∞ controller when 20Ω electric load applied for the prototype with C Class road input and 50km/h vehicle speed. Average power regeneration at passive mode is: 19.83Watt that complies with experiment result.