How do piezoelectric injectors work?
Piezoelectric Injectors This material generates an electrical charge when a mechanical stress is applied. Likewise, the crystal will change shape when an electrical charge is applied. When the Piezo actuator is de-energized, the valve closes and high pressure fuel forces the needle to return to the closed position.
How does a piezo diesel injector work?
Piezo fuel injectors (CRI4), which use piezo crystals as part of a rapid actuator, are helping manufacturers to meet their Euro 6 target. These injectors work by passing electrical current through a stack of Piezo crystals, causing them to expand; as the crystal discharges the current it contracts to the original size.
What is the difference between piezo and solenoid injectors?
Piezo injectors are quieter and more precise than solenoid units, a benefit in a microsecond environment, but they are more expensive. The electronic engine management system controls the precise opening and closing of the fuel-flow valve in each injector.
How can you tell if you have piezo diesel injectors?
The majority of piezoelectric injectors may be recognised by the location of the leak off pipe, located at the side of the injector and not on the top as seen on the electromagnetic type. The operating fuel pressure within modern common rail systems may exceed 1,800 bar, or 26,100 psi.
Can piezo injectors be repaired?
It is very specialised work, and can’t be undertaken by every repair shop. The injector is totally stripped down, cleaned ultrasonically, and reassembled with new parts fitted if necessary.
What is the activation voltage for piezo injectors?
WARNING HIGH VOLTAGE: Piezo injectors normally operate at voltages up to 200 volts. Extreme care should be taken to protect against shock. Do not touch any of the injector terminals while the engine is running.
What is the advantage of piezo actuators over solenoid actuators?
Piezo actuators allow a quasi-static stroke proportional to the charge applied. This is a key advantage compared to solenoid actuators, only achieving partial stroke in ballistic operation.
What are piezoelectric transducers?
What are Piezoelectric Transducers? Piezoelectric transducers are a type of electroacoustic transducer that convert the electrical charges produced by some forms of solid materials into energy. The word “piezoelectric” literally means electricity caused by pressure.
How do diesel injectors work?
How do diesel engine fuel injectors work? The fuel injection system lies at the very heart of the diesel engine. By pressurising and injecting the fuel, the system forces it into air that has been compressed to high pressure in the combustion chamber. … high-pressure pipe – sends fuel to the injection nozzle. injection nozzle – injects the fuel into the cylinder.
What is piezoelectric pressure sensor?
What is a piezoelectric pressure sensor? The piezoelectric pressure sensor is a sensor that uses the piezoelectric effect of piezoelectric materials to convert the measured pressure into an electrical signal. Use electrical components and other machinery to convert the pressure to be measured into electricity.