This is characterized by its ability to dilate or retract when it receives a pulse of current – the piezoelectric effect. The operation of piezoelectric injectors is quite similar to that of solenoid injectors, with the difference that they have a ceramic core. Principle of operation of the petrol piezo injector In order to lower engine noise, the engine's electronic control unit can inject a small amount of fuel just before the main injection event ("pilot" injection), thus reducing its explosiveness and vibration, as well as optimizing injection timing and quantity for variations in fuel quality, cold starting and so on.įig. Piezo injectors make possible fine electronic control over the fuel injection time and quantity, and the higher pressure that the common rail technology makes available provides better fuel atomization. Directly injecting fuel into the combustion chamber requires high pressure injection whereas low pressure is used injecting into the intake tract or cylinder port. The gasoline is highly pressurized, and injected via a common rail fuel line directly into the combustion chamber of each cylinder, as opposed to conventional multi-point fuel injection that injects fuel into the intake tract, or cylinder port. In non-Diesel internal combustion engines, Gasoline Direct Injection (GDI), also known as Petrol Direct Injection, Direct Petrol Injection, Spark Ignited Direct Injection (SIDI) and Fuel Stratified Injection (FSI), is a variant of fuel injection employed in modern two-stroke and four-stroke gasoline engines. By adding the fuel to the air sucked in by the engine, a mixture is created with the required fuel/air ratio. Injectors are electrically operated valves which accurately control the quantity of fuel delivered.
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