What is metering in diesel engine?

A fuel metering system for an internal combustion engine uses a digital computer to calculate the desired fuel flow to maintain an air/fuel ratio required under the engine operating conditions existing at the time.

How does a diesel injection system work?

The fuel injection system lies at the very heart of the diesel engine. By pressurising and injecting the fuel, the system forces it into air that has been compressed to high pressure in the combustion chamber. injection nozzle – injects the fuel into the cylinder. feed pump – sucks fuel from the fuel tank.

How is electronic control used in a diesel injection system?

Most fuel injection systems use electronics to control the opening and closing of the nozzle. Electrical signals are converted into mechanical forces using some type of actuator. Commonly, these actuators can be either electromagnetic solenoids or active materials such a piezoelectric ceramics.

How does the ECM control the fuel-injection amount?

The ECU determines the amount of fuel to inject based on a number of sensor readings. Oxygen sensors tell the ECU whether the engine is running rich (too much fuel or too little oxygen) or running lean (too much oxygen or too little fuel) as compared to ideal conditions (known as stoichiometric).

Which cycle is used in diesel engine?

Diesel combustion. The diesel engine is an intermittent-combustion piston-cylinder device. It operates on either a two-stroke or four-stroke cycle (see figure); however, unlike the spark-ignition gasoline engine, the diesel engine induces only air into the combustion chamber on its intake stroke.

What is fuel metering unit?

The fuel metering unit is disposed in a fuel flow between a prefeed pump and a high-pressure fuel pump of a fuel injection system for an internal combustion engine and serves to variably adjust the fuel quantity delivered by the high-pressure fuel pump.

What are the components of diesel fuel system?

A basic diesel fuel system is made up of five essential components. These are the tank, the fuel transfer pump, filters, the injection pump, and the injection nozzles. The fuel tanks in diesel systems are typically crafted from aluminum alloys or sheet metal.

What controls rpm in a diesel engine?

The driver of a car controls the engine’s power to achieve vehicle speed. The operator of an off-highway diesel engine just controls engine speed, and power is developed automatically.

How does the ECM work?

The ECM monitors most of the sensors in the engine bay in order to manage your vehicle’s air-fuel mixture and regulate the emission control systems. In terms of the air-fuel ratio, the ECM uses sensors to regulate the oxygen to fuel ratio detected in your car’s exhaust to detect an engine rich/lean reading.

What is the difference between an ECU and an ECM?

ECM is the engine control module. This is sometimes also called an ECU, which is still true because ECU (engine control unit) is a larger category of electronic modules which includes other control systems (such as air conditioning, cruise control, airbags, anti-lock braking system).

What is Diesel cycle process?

The Diesel cycle is a combustion process of a reciprocating internal combustion engine. In it, fuel is ignited by heat generated during the compression of air in the combustion chamber, into which fuel is then injected.

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