This uses pulse width modulation to control injectors.

This uses pulse width modulation to control injectors.

• A. Sequential Fuel Injection
• B. Electronically Controlled Fuel Injection
• C. Non-Sequential Fuel Injection
• D. Mechanically Controlled Fuel Injection

Answer: (B)

Pulse width modulation controls how much fuel an injector delivers by adjusting the time the injector stays open during each engine cycle. In electronically controlled fuel injection, the engine control unit sends rapid electrical pulses to each injector and varies the width of those pulses (the duty cycle) based on sensor data like speed, load, and temperature. A longer pulse opens the injector longer, delivering more fuel; a shorter pulse reduces fuel. This precise electronic metering is what defines electronically controlled fuel injection. Other systems rely on fixed, cam-driven, or mechanical timing and don’t use ECU-controlled PWM to modulate fuel per cycle, even though sequential or non-sequential firing describes when cylinders are injected.

Pulse width modulation controls how much fuel an injector delivers by adjusting the time the injector stays open during each engine cycle. In electronically controlled fuel injection, the engine control unit sends rapid electrical pulses to each injector and varies the width of those pulses (the duty cycle) based on sensor data like speed, load, and temperature. A longer pulse opens the injector longer, delivering more fuel; a shorter pulse reduces fuel. This precise electronic metering is what defines electronically controlled fuel injection. Other systems rely on fixed, cam-driven, or mechanical timing and don’t use ECU-controlled PWM to modulate fuel per cycle, even though sequential or non-sequential firing describes when cylinders are injected.