Direct instantaneous torque control strategy for vehicle SRM based on improved convergence rate sliding mode control

Area of Science:

• Electrical Engineering
• Control Systems
• Automotive Engineering

Background:

• Traditional sliding mode control (SMC) for switched reluctance motors (SRMs) exhibits chattering and slow response times.
• These limitations hinder the application of SRMs in new energy vehicle (NEV) drive systems.
• Direct instantaneous torque control (DITC) is crucial for efficient NEV propulsion.

Purpose of the Study:

• To develop an advanced DITC strategy for SRMs.
• To mitigate chattering and shorten response times in SRM control.
• To improve the dynamic performance of NEV drive systems utilizing SRMs.

Main Methods:

• An improved convergence rate sliding mode control (SMC) strategy is proposed.
• System state variables are integrated into the SMC convergence rate to accelerate system approach to the sliding surface.
• A continuous piecewise switching function is employed to reduce chattering during sliding surface transitions.

Main Results:

• The proposed control strategy effectively suppresses system chattering.
• The system response time is significantly reduced.
• Enhanced dynamic performance of the 8/6-pole SRM is demonstrated through simulations.

Conclusions:

• The improved SMC strategy offers a viable solution for DITC in SRMs.
• This advancement is particularly beneficial for NEV applications requiring precise and rapid torque control.
• The proposed method enhances the overall efficiency and responsiveness of electric drive systems.