Search

For the phenomena of big shock and body irregularities occurs in shifting gear when driving EV, the operating mode of driving motor during EV shifting process is analyzed, a control strategy applied to EV shifting process is made out, according to the validation of simulates bench test and vehicle test, by applying the motor control strategy, it can reduce the shifting time, decrease shifting shock, improve shift-feel.

In order to improve the performance of switched reluctance motor (SRM) drives, some advanced control strategies have been proposed, such as current or flux linkage profile control. To achieve these strategies the motor phase current or phase flux linkage should be controlled precisely. All these require increasing the switching frequency of converter to upgrade stability and dynamic response speed. However, the higher switching frequency may cause the higher switching losses, higher electro-magnetic interference (EMI) and the lower overall efficiency. The use of soft-switching techniques in converter can contribute to reduce them. In this paper a novel soft-switching converter for SRM is presented, which possesses advantages of resonant switch converter (RS), resonant DC link converter (RDCL) and PWM. The addition of external commutating devices to conventional asymmetric bridge converter for SRM substantially reduces switching losses and EMI. The conditions of soft switching are deduced and a practical design consideration is given. Finally, detailed simulation study of the complete system is presented and validated with experimental results

Due to the inherent advantages, such as simple structure, ability to operate in harsh environments, fault-tolerant and four-quadrant operation, and wide speed range with high power density and high efficiency, switched reluctance motor drives (SRD) becomes a strong competitor in electric vehicle application. In vehicle propulsion the vehicle control unit expects a precise and stationary average torque of the electric drive which tracks precisely the reference torque to perform vehicle dynamic control. In this paper, a novel control strategy is presented to achieve closed-loop torque control for SRD more accurately at varying load and changing electrical input condition. Additionally, a novel method for real-time measurement of flux linkage is presented, and simulation and experimental studies have been done. Finally, the feasibility of the torque control strategy is validated with performance test of the proposed system.