The typical noise emissions occur when TDI engines are idling above all due to the noise generated by the unit injectors, not due to the combustion. This allows more precise control of the injection phases and flexible control of the injection quantities. As a result, the emission levels are improved and greater performance is possible.Īs the new piezo valve switches approximately four times faster than the previous solenoid valve, it is now possible to close the switching valve and open it again for each injection phase. The extended injection pressure range (130-2200bar) has allowed a further change in this area. For example, the pilot injection phase requires a lower injection pressure and the main injection phase a very high injection pressure. The power required to drive the unit injector is therefore also lower.Įach injection phase has different requirements in terms of injection pressure. The mechanical noises transferred by the drive are reduced by the smaller pump plunger diameter. In future, the new unit injectors will be used in the new 2.0l-125kW 4V TDI engine and later in other 4-valve TDI engines. This new type uses the same fitting as the unit injector with solenoid valve (PDE-P2) and is also secured with 2 screws to avoid additional engine assembly costs. It has therefore been possible to reduce the high-pressure volume in favour of efficiency.Ģ00 employees are currently working on the production of the new unit injector. Furthermore the mechanical control of the varying injection pressures within the unit injector has been improved so that there is no need for a retraction piston. As the name says, the solenoid valve has been replaced by a faster and more controllable piezovalve. The unit injector with piezo valve (version: PPD 1.1) is a further development of the solenoid-type unit injector. The new production site is located in Stollberg in Saxony. KG has been founded for production of the unit injector with piezo valve in collaboration with Siemens VDO Automotive AG. Improved mixture, higher efficiency and lower noise emissions are the innovative results. It also allows new flexibility in the configuration of the pilot, main and secondary injection phases. In collaboration with Siemens VDO Automotive AG, we have developed a unit injector with the same or even greater advantages. The introduction and ongoing development of unit injectors has created considerable competitive advantages in the areas of injection pressure, injection precision and efficiency. Customer satisfaction, environmental protection and the fulfilment of legal requirements are always at the forefront and can only be achieved through continued development. Nevertheless the targets for diesel engines in terms of emissions, driving comfort and engine performance are also being raised constantly. Low consumption and excellent performance have made the rise of the diesel engine unstoppable. The self-study programme shows the design and function of new developments.The contents will not be updated.įor current testing, adjustment and repair instructions, refer to the relevant service literature.
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