It helps in enhanced efficiency and power.ĮCU (Electronic Control Unit) regulates the fuel injection pressure depending on the speed and load on the engine.
It comprises a single common rail (line) to supply fuel to all the fuel injectors.ĬRDi engines can maintain a constant fuel injection pressure due to the presence of a common rail.ĭue to the constant pressure, the fuel spray is very fine and is evenly distributed. It is a type of diesel engine known as a Common Rail Direct Injection (CRDi) engine.ĬRDi is a fuel injection technology used in modern diesel engines. Since the air pressure is higher than atmospheric pressure, the engine produces more power. The air is fed into the cylinders via an intercooler that cools the air before it reaches the cylinders. The air compressor sucks in more air that is compressed and passes through the air outlet port. The exhaust gases pass through the turbine, and in turn, it spins the compressor. The waste exhaust gases enter at high pressure via the inlet port. The components are housed in a snail-shaped covering with an inlet port. It is an internal combustion engine with forced air induction.Īn additional component called a turbocharger is used for forced air induction.Ī turbocharger comprises a shaft with a turbine at one end and an air compressor at the other end. It is simple in construction and more reliable than forced air induction engines. It produces less power than forced air induction engines (turbocharged/supercharged). It does not use forced induction of air into the intake manifold. In this type of engine, air intake depends on atmospheric pressure. It’s also called a normally aspirated engine or NA. Here are the types of auto engines used in cars in India. The diesel engine also works on the same principle, but fuel injectors replace the spark plug to ignite the hot air. Note: The above working mechanism is of a petrol engine. The cycle repeats thousands of times per minute to power the vehicle. And when the piston moves up, it pushes out the gases generated by the explosion via the exhaust valve. Hence, it’s also called a power stroke.Įxhaust: As soon as the piston moves down, the exhaust valve opens. This store provides the power to propel the vehicles. It causes a small explosion, and the energy generated by it pushes the piston down.
The piston moves up/down with the help of a crankshaft.Ĭompression: As the name suggests, the piston moves up and compresses the air-fuel mixture inside the combustion chamber in this stroke.Ĭombustion (Power): The spark plug produces a spark during this stroke and ignites the compressed hot air-fuel mixture. The valve opens and closes with the help of a camshaft. Intake: In this stroke, the piston moves down, and the intake valve opens and releases the air-fuel mixture inside the combustion chamber. Below are the detailed explanations of each stroke. The four strokes include intake, compression, combustion and exhaust. Hence, modern-day engines are also called four-stroke engines. This process is called the combustion cycle, and the process repeats thousands of times per minute to propel the car.Ī combustion cycle has four strokes (steps). It is achieved by igniting the air-fuel mixture inside the engine's cylinders.
But have you ever wondered how an engine works? Modern-day engines generate power via internal combustion or controlled explosions. When you turn on the ignition key, the engine comes to life.