Design And Development Of A Sensorless Integrated Starter Generator Controller Using Mosfet-based Shunt Regulation

Abstract

The Increasing Demand For Improved Fuel Efficiency And Reduced Emissions Has Driven The Development Of Advanced Automotive Electrical Systems. Conventional Vehicles Utilize Separate Starter Motors And Alternators For Engine Cranking And Battery Charging Respectively, Which Increases System Complexity And Reduces Efficiency. Integrated Starter Generator (ISG) Technology Combines These Two Functions Into A Single Electromechanical Unit, Thereby Reducing Mechanical Complexity And Improving Energy Utilization. This Paper Presents The Design And Implementation Of A Sensorless Integrated Starter Generator (ISG) Controller Using MOSFET-based Shunt Regulation. The Proposed System Employs A Three-phase Six-switch MOSFET Inverter Bridge That Performs Both Motoring And Charging Operations. During Engine Startup, The Inverter Operates In Motoring Mode To Drive The ISG Machine And Crank The Engine. Once The Engine Starts, The ISG Operates As A Generator And The Inverter Functions As An Active Rectifier To Convert AC Power Into DC For Battery Charging. Voltage Regulation Is Achieved Using MOSFET-based Shunt Control. A Sensorless Control Strategy Based On Back Electromotive Force (Back-EMF) Estimation Is Implemented To Eliminate The Need For Mechanical Position Sensors. This Reduces System Cost, Improves Reliability, And Simplifies System Integration. Experimental Results Demonstrate Stable Engine Startup, Efficient Charging Performance, And Reliable Sensorless Operation.

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