Operation Section
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5. INJECTOR DESCRIPTION
5.1 General Description
z The injector injects the pressurized fuel in the rail into the engine combustion chamber at the optimal injection timing,
injection quantity, injection rate, and injection pattern, in accordance with signals from the ECU.
z Injection is controlled using a TWV (Two-Way Valve) and orifice. The TWV controls the pressure in the control chamber
to control the start and end of injection. The orifice controls the injection rate by restraining the speed at which the nozzle
opens.
z The command piston opens and closes the valve by transmitting the control chamber pressure to the nozzle needle.
z When the nozzle needle valve is open, the nozzle atomizes the fuel and injects it.
z There are three types of injectors: the X1, X2, and G2.
Q000862E
ECU
Supply Pump
Nozzle
Command Piston
Control Chamber Portion
Orifice
TWV
Rail
Rail Pressure Sensor
Nozzle Needle
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