Injectors (high-pressure fuel valves)
The injector sprays the fuel into the combustion chamber under high pressure. The injector opens the tip of the nozzle needle outwards and forms a ring gap that is only a few micrometers wide. The ring gap shapes the high precision injection and ensures even, cone-shaped divergence.
The piezo-electric activation has the following advantages compared to activation via solenoid coils:
- improved possibilities for multiple fuel injection due to rapid switching times with very short dead times.
This results in significant improvements with regard to pollutant emission as well as fuel consumption.
| Item | Explanation |
|---|---|
| 1 | Electrical connection |
| 2 | Fuel line connection |
| 3 | Layers of piezo elements |
| 4 | Nozzle needle, tip opens outwards |
| 5 | Teflon ring (seals off the combustion chamber) |
A piezo element is an electromechanical converter. The piezo element is a type of ceramic that converts electrical energy directly into mechanical energy (power/travel). The piezo element expands when voltage is applied. This creates the stroke of the nozzle needle. To achieve a greater stroke, a piezo element can be structured in a number of layers.
| Item | Explanation |
|---|---|
| 1 | Piezo element without voltage |
| 2 | Layers of piezo elements |
| 3 | Piezo element, voltage applied |