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Technology Outline The Engine Management System (EMS)is responsible for controlling the amount of fuel being injected and for adjusting theignition timing. Optimum functioning of the EMS assures maximum engine power, with the lowest amount of exhaust emissions and the lowest fuel consumption.
• The EMS is comprised of sensors for intake air and coolant temperature, intake manifold absolute pressure (MAP) and throttle position (TPS), as well as sensors for engine speed and signals for the required injection and ignition spark events, and a sensor for information about the oxygen content in the exhaust.• Furthermore, there is an idle speed motor for adjusting and stabilizing the idle speed, or an electronic throttle body and finally a fuel pressure regulator and fuel injector(s). The supplied high-energy ignition coils are controlled by the integrated ignition module. For alternative fuel applications fuel rail pressure and temperature sensors are also utilized.
Air Induction System/Control• The purpose of the air induction control/system is to filter, meter and measure intake air flow into the engine.
Fuel Delivery System/Control• The purpose of fuel delivery system/control is to inject the correct and precise amount of fuel in the intake manifold.
Electronic Control System• The Purpose of electronic control system is to detect air temperature, engine temperature, throttle valve opening angle, amount of air entering air induction system, etc.• The system control the correct amount of fuel to be injected and the proper time at which the fuel will be injected at any speed and load condition.
Electronic control unit• The Electronic control unit serves as the control center for all of the sensors on a car. The engine control unit is responsible for monitoring and controlling all the sensors on a cars engine. The ECU monitors the performance of the engine and makes adjustments according to where the problem is. The ECU also does calculations of pulse length (injector time opening) and adjustments to any change in the engine.
FUNCTION OF KNOCK SENSOR The function of the knock sensor is toproduce an electrical signal that the ECU can use to determine if knock has occurred.The ECU will then provide less ignition advance until knock is removed.
KNOCK SENSOR● Engine knock occurs in the combustionchamber when two high-pressure wavescollide.● This unwanted and damaging event can becaused in different ways.● Two examples are excessive load on theengine and engine overheated.
Engine Oil SensorThe function of the engine oil sensor is toproduce an electrical signal that theECU can use to determine the quality ofthe oil.
Engine oil sensor• The electrical capacitance value of oil varies with various oil properties, these include Viscosity anti-foaming cleaning.• Electronic circuitry within the sensor converts the capacitance value of the oil to a voltage signal. The ECU monitors voltage signal from sensor and uses this data to determine service requirements.
Multi-point fuel injectionMulti-point fuel injection injects fuel into the intake portjust upstream of the cylinders intake valve, rather thanat a central point within an intake manifold, referred toas SPFI, or single point fuel injection.MPFI (or just MPI) systems can be sequential, in whichinjection is timed to coincide with each cylinders intakestroke, batched, in which fuel is injected to the cylindersin groups, without precise synchronization to anyparticular cylinders intake stroke, or Simultaneous, inwhich fuel is injected at the same time to all thecylinders.
• Multi point fuel injection or MPFI uses several injectors, normally respective to the number of engine cylinders and placed in the inlet port of each cylinder.• MPFI (or just MPI) systems can be sequential, in which injection is timed to coincide with each cylinders before intake stroke.
• It is to be noted that fuel spaying is taking place out side of the cylinder at the correct time according to the piston position inside the cylinder.• There will be electronic control unit or ECU which will be receiving feed back from several sensors like engine speed sensor, fly wheel position sensor, vehicle speed sensor, atmospheric temperature sensor, accelerator pedal position sensor, intake airflow sensor.
• This ECU will control the correct amount of fuel to be injected and the proper time at which the fuel will be injected at any speed and load condition.• This will ensure maximum power output at minimum fuel.