Piezo

How does piezo injector work?

How does piezo 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.

  1. Where are piezo injectors used?
  2. What is the difference between piezo and solenoid injectors?
  3. How can you tell if you have a piezo injector?
  4. Can piezo injectors be repaired?
  5. What is the activation voltage for piezo injectors?
  6. What cars use piezo injectors?
  7. How do solenoid injectors work?
  8. What is the advantage of piezo actuators over solenoid actuators?
  9. What is piezoelectric technology?
  10. How does a Bosch piezo injector work?
  11. How long does diesel injectors last?

Where are piezo injectors used?

Because Piezo injectors are used in common rail injection systems, high pressure fuel is constantly delivered to the tip of the injector where a needle rests and blocks fuel from being injected. Pressurized fuel is delivered to the top of this needle as well, the force of which keeps the needle closed.

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 a piezo injector?

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 cars use piezo injectors?

A partial list of companies using engines with piezo injectorsin the US and world wide are Ford, Dodge, GM, Toyota, Honda Nissan, Mercedes-Benz, BMW and Volkswagen/Audi.

How do solenoid injectors work?

Electromagnetic – or solenoid – injectors have a traditional coil, like you would see for a gas injector. The voltage that's applied to the coil pulls the solenoid valve up. As it does, it allows the check ball to move up with it. Below the check ball is the inlet in the side of the injector for the high pressure fuel.

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 is piezoelectric technology?

Piezoelectricity is the process of using crystals to convert mechanical energy into electrical energy, or vice versa. Regular crystals are defined by their organized and repeating structure of atoms that are held together by bonds, this is called a unit cell.

How does a Bosch piezo 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.

How long does diesel injectors last?

The average lifespan of a diesel fuel injector is around 100,000 miles. A typical fuel injector has two basic parts: the nozzle and the injector body. If either of these components gets clogged or damaged, it will compromise the entire performance of the vehicle.

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