How do fuel injector driver circuits work?

Fuel injector drivers control solenoid injectors by providing: Peak current (8-16A) for rapid opening against fuel pressure, then hold current (2-4A) to maintain open position with less power dissipation. Peak-and-hold or saturated switching strategies achieve this. Driver circuits include current sensing, protection against short circuit and open load, diagnostic feedback, and precise timing control (microsecond accuracy). Modern systems use smart power devices integrating driver, protection, and diagnostics. The ECU commands injection duration; the driver controls the current profile.