The unit injector combines a high-pressure pump and nozzle with a solenoid valve to form compact assembly. As a result, high-pressure lines are no longer necessary and injection can be controlled by the integrated and extremely precise solenoid valve at pressures of up to 2000 bar. Each cylinder has a unit injector fitted between the valves in the cylinder head. The unit injector is used in both passenger cars and commercial vehicles.
The Bosch Unit Injector system was first used in the VW Passat TDI in 1998, after which it rapidly found favour within the VW range. With the V10 TDI, VW recently presented what is currently the most powerful diesel engine for use in a car.
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