Corsa C
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Injector - Z 13 DT DOHC diesel engine Injectors (injector nozzles with electronically controlled valves) carry out injection processes at the right time and with exactly the right amount of fuel. The injectors are attached in pairs to the camshaft housing by means of fastening straps.
How the injectors work The fuel is led from the high-pressure connection to the nozzle via a feed duct and via the input throttle to the valve control chamber. The valve control chamber is connected with the fuel return system via the output throttle which can be opened by a solenoid valve. When the output throttle is closed, the hydraulic force on the valve control plunger outweighs the force on the differential ratio of the nozzle needle. As a result of this, the nozzle needle is forced into its seat and seals off the high pressure duct to the combustion chamber. When the solenoid valve is actuated, the outlet throttle is opened. As a result the pressure in the valve control plunger, and thereby the hydraulic force on the valve control plunger, drops. As soon as the force acting on the valve control plunger drops below the level of force of the nozzle needle differential ratio, the nozzle needle opens so that the fuel is injected into the combustion chamber. This indirect actuation of the nozzle needle by means of a hydraulic force booster system is used because the force required to open the nozzle needle quickly cannot be generated directly with the solenoid valve. The so-called control quantity that is required in addition to the injected quantity of fuel is led via the control chamber throttles to the fuel return system.
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