1. A085_e
Eddy Current displacement sensors
eddyNCDT
Displacement/timing measurement in the common rail injector
Diesel engines of the latest generation no longer Measurement system requirements
have a diesel injection pump to supply fuel, but - Measuring range: 500 µm
instead utilize the common rail principle. In order to - Resolution: 1 µm
optimize injector configuration for the respective - Bandwidth: 100 kHz
engine model it is necessary to know the exact
timing/displacement behavior of the needle valve. Environmental conditions
This information is delivered by an eddy current - Temperature: 100 °C
sensor built into the injector. - Medium: fuel
Because of the physical limitations (i.e. practically no - lnterference field: Electromagnetic field
installation space), a sensor with very small
dimensions is required. The solution here is the System requirements
miniature version of the EU05 eddy current sensor for DT3301(01) Controller
commercial vehicle injectors and the ES05 sensor for SCD3/8 Power cable
passenger car injectors. SCA3/5 Signal cable
EC3/2 Cable extension
Reasons for selecting the system EA3200 Adaption board
- Non-contact measurement, as displacement EU05(65) Sensor; alternative EU05(93)
transformation inevitable
- High temperature resistance
- Temperature-compensated measurement
- High system speed, as the injection process is in
the micron to millisecond range
- Resistant to electromagnetic fields
(solenoid valve)
- Resistant to fuels
Displacement sensor
Nozzle spring
Injection needle
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