Minggu, 09 Oktober 2022



Delphi Small Engine Management System Service Manual

What is EMS?

An EMS (Engine Management System) is a self contained set of components including a custom built computer and sensors and actuators which control the operation of an engine by monitoring the engine speed, load and temperature and providing the ignition spark at the right time for the prevailing conditions and metering the fuel to the engine in the exact quantity required.
In simplest terms, the purpose of fuel injection is to deliver fuel to achieve the desired air/fuel mass ratio to the engine. Fuel atomization and injector targeting play critical roles in achieving this ratio. The accuracy of the air/fuel mass ratio has a direct effect on emissions, fuel economy, power and drivability, start quality and idle quality.

Typical Components of EMS

Typically EMS for small gasoline engine consists of the following components
  • Crank position sensor (Supplied by vehicle manufacturer)
  •  Engine control unit (Delphi Part, refer part list for part no)
  • Engine temperature sensor (Delphi part)
  • Fuel injector (Delphi part, Refer part list for part no)
  • Fuel module – Pump, pressure regulator and strainer (Delphi part)
  • Intake air temperature sensor (Delphi part)
  • Intake pressure sensor or MAP/MAP sensor (Delphi part)
  • Throttle body assembly – Throttle body, Idle air adjust screw or valve, Throttle
  • Position sensor, (Delphi part)
  • Inductive Ignition coil (Delphi part)
  • Oxygen sensor(Delphi part)
  • Evaporative Canister Purge Valve

Comparison of EMS and Carburetor

  • Better Air and Fuel Control – Resulting in better pick up and faster response
  •  Lower mechanical complexity – Unlike carburetor the EMS bike does not have choke or any other mechanical levers, this reduces the mechanical complexity and gives more flexibility to the driver
  • Easy to service – The serviceability of the EMS is easy. By the use of its powerful diagnostic tool system malfunctions can be easily detected and corrected. Faultfinding and error proofing by using advanced diagnostics.
  • Better cold startability – The driver need not worry when he/she is starting the bike early morning. The powerful on board computer measures the temperature of the ambient conditions and the engine conditions and provides necessary fuel that the bike starts instantly
  • Lower emissions
  • Better Drivability – Due to better control and response the drivability of the vehicle is considerably enhanced giving driving pleasure the utmost priority.
  • EMS takes biking to the next level in ensuring that the driver enjoys the ride
  • very comfortably.
  •  Better hot fuel handling
  • Better altitude compensation
  • Fuel Timing control
  • Improve fuel economy (engine dependent)
  • Better take off

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