Design And Development Of A Series Regulated Integrated Starter Generator (isg) Controller With Diagnostic Features

Abstract

Modern Automotive Systems Require Efficient Electrical Power Generation And Management Due To Increasing Electrical Loads And Stringent Emission Regulations. Conventional Vehicles Utilize Separate Starter Motors And Alternators For Engine Cranking And Battery Charging Respectively. This Configuration Increases System Weight, Mechanical Complexity, And Energy Losses. Integrated Starter Generator (ISG) Technology Has Emerged As An Efficient Solution That Combines Both Functions Into A Single Electromechanical System. This Paper Presents The Design And Development Of A Series Regulated Integrated Starter Generator Controller Capable Of Operating In Both Motoring And Charging Modes. In Motoring Mode, A Three-phase MOSFET Inverter Converts DC Battery Voltage Into Three-phase AC To Drive The ISG Machine And Start The Engine. In Charging Mode, The ISG Machine Operates As A Generator And The Generated AC Power Is Rectified And Regulated Using Three SCRs Operating In Series Regulation Mode. A Microcontroller-based Control Strategy Is Implemented To Manage Inverter Switching, SCR Firing Control, And Mode Transition Between Motoring And Charging. In Addition, A Current-based Diagnostic System Is Implemented To Detect Electrical Faults Such As Phase Open Faults, Phase Short Faults, And Phase-to-ground Faults.The Proposed ISG Controller Improves System Efficiency, Reduces Mechanical Complexity, And Enhances System Reliability. Experimental Results Demonstrate Stable Engine Startup, Efficient Battery Charging, And Reliable Fault Detection Under Different Operating Conditions.

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