The researchers have recently increased the attention in controllable fulids and its applications.Magnetorheological(MR) dampers are devices that employ rheological fluids to modify their mechanical propeties.Their mechanical simplicity,high dynamic range,lower power requirements,large force capacity,robustness and safe manner operation in case of fail have made them attractive devices to semi-active control in civil,aerospace and automotive suspension applications.The mechanical models of the magnetorheological dampers by parameter modeling and non-parameter modeling were discussed and analyzed. In especial, eight models were described in detail. It is pointed out that the different design should adapt different model in order to take advantage of its characteristic.
Based on the study of the Matlab rapid prototyping technology, the rapid prototyping design approach is presented, which is widely applicable to all kinds of microcontroller. Through the modification of the system target file, the automatic code generation function of the Matlab could support more microcontrollers. The rapid prototyping of in-wheel motor controller is designed through this approach. Then the embedded C codes are generated according to the vector control algorithm model which is validated by simulation, and the rapid prototyping of in-wheel motor controller is achieved. The proposed approach is validated through the comparison to hand-written code.
A simulation model of EV with the software of AMESim was established and the ABS control method with four independent channel by electric brake was designed in Simulink with the fuzzy logic control. The simulation is carried on under the low tire-road friction coefficient. The simulation results show that, the co-simulation model and its control method is able to simulate the actual ABS braking process, ensure the wheel speed well follow the vehicle speed, improve the steerability and stability of the EV. Model parameters can be adjusted, so research on different parameters on the effect of ABS can be carried on, and the simulation model can be used as a well platform for ABS study on EV.
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