11/17/2023 0 Comments Typical common rail piezo injector.![]() This reaction operates considerably faster than a traditional mechanical injection system. Once the fuel is injected, the electrical current stops and the piezo stack contracts once again, closing the injector. This lengthens the overall stack, and forces the injector open, allowing diesel directly into the engine. Thanks to the piezoelectric effect, the crystals expand, creating a small amount of movement. When the engine needs to inject fuel into the combustion chamber, the ECU applies an electrical current to the piezo injector. While each individual wafer only expands a tiny amount, multiple wafers all moving together has a cascading effect, creating a significant amount of rapid linear movement without any mechanical links required. When an electrical voltage is applied, each of them expands. These discs and wafers are all stacked on top of one another. ![]() Instead of using mechanical pump nozzles, piezo injectors use an actuator module made of thousands of wafers or discs, each made of piezo crystals. It’s this change in shape that makes piezoelectric crystals perfect actuators for diesel fuel injectors. More importantly, this also works the other way around: if you run an electric current through a piezo crystal, the crystal will change shape slightly. When mechanical stress is applied to certain crystals (for example, if it’s compressed or struck), an electrical charge is generated in the crystal. This is thanks to the piezoelectric effect, first discovered in 1880. Specifically, piezo crystals rapidly expand and contract. The unique attribute of piezo crystals such as quartz is that they change shape when exposed to an electrical current. Using certain crystals (known as piezo crystals), piezoelectric injectors are able to offer superior performance to traditional diesel injection systems while minimising the emissions and noise many associate with diesel. Piezoelectric injectors are highly efficient compared to traditional solenoid injectors, and are the beating heart of modern common-rail diesel engines. A Mercedes-Benz mechanic explains the science behind piezoelectric injectors Today, our Mercedes-Benz mechanics in Melbourne explain what these injectors are, and how they function. It’s no wonder that these systems are commonly found in many diesel-powered Mercedes vehicles.Īnd at the heart of these common-rail systems are piezoelectric injectors. This has several advantages most importantly, they allow for reduced emissions, better fuel consumption and less noise, all while delivering more power than traditional injection methods. Instead of using mechanically-operated pump nozzles to direct fuel, common-rail systems use high-pressure rails to direct fuel to each solenoid valve. ![]() Modern diesel Mercedes-Benz engines use common-rail direct injection. Each component in your Mercedes-Benz engine are highly-engineered, and designed to provide maximum performance.įuel injectors in particular are a crucial part of your Mercedes’ engine, responsible for delivering fuel to the engine’s combustion chamber. ![]() ![]() In addition to luxury, Mercedes-Benz vehicles are designed for performance and maximum efficiency. ![]()
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