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How Does an Engine Stop Motor Work?

Published in Automotive Engineering 2 mins read

An engine stop motor is a small electric motor used to mechanically stop an internal combustion engine by engaging a mechanism that interrupts the fuel supply or ignition system.

How Engine Stop Motors Work

  1. Electric Motor: The engine stop motor is powered by an electric current.
  2. Mechanical Linkage: The motor is connected to a mechanical linkage, often a lever or a cable, that interacts with the engine's fuel or ignition system.
  3. Activation: When the stop motor receives a signal, it rotates, moving the linkage.
  4. Engine Stop: The linkage's movement interrupts the engine's operation by:
    • Fuel Cutoff: Blocking the fuel supply to the engine.
    • Ignition Cut: Disrupting the spark plug's ignition system.

Types of Engine Stop Motors

  • Solenoid Motors: These motors use an electromagnet to create a force that moves a plunger, activating the linkage.
  • DC Motors: These motors are powered by direct current and are typically used in smaller applications.
  • Stepper Motors: These motors provide precise control over the linkage's movement, allowing for more accurate engine stopping.

Applications of Engine Stop Motors

Engine stop motors are commonly found in:

  • Automotive Engines: Used for starting and stopping the engine, often controlled by the ignition key.
  • Industrial Engines: Found in machinery and equipment where remote shutdown is necessary.
  • Marine Engines: Employed in boats and ships for safety and control.

Advantages of Engine Stop Motors

  • Remote Control: Allows for convenient engine shutdown from a distance.
  • Automatic Operation: Can be integrated into automated systems for engine control.
  • Safety Feature: Provides a reliable method for stopping the engine in emergencies.

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