The machine is equipped with two similar test stations. Each station evaluates a wide range of values that are characteristic for a diesel injector by use of a shot to shot measurement device.
The test sequence starts after the operator has inserted an injector into the text fixture. The selected testplan contains the test sequence as well as the targets and limits of each attribute. The sequence is defined by a number of single test points. The main difference between the single points are the system pressure and the injector opening time.
During each test point a various number of results (e.g. system pressure, injector rate, opening and closing time, backleak pressure and backleak flowrate) are collected, evaluated and stored in the database of the machine.
At the end of the cycle the machine evaluates all attributes and displays the result to the operator.
Highlights
- The test bench software remote controls the integrated shot to shot measurement device.
- The test bench has been designed for a simultaneous maintenance of the stations while the other station is in production.
- In order to obtain results close to the field, the system high pressure pump as well as a modified engine ECU from the customer are in use.
- The pump is driven by a servo controlled motor to ensure a stable injection rate.
- The test bench software remote controls the modified engine ECU so that special values from the ECU can be changed online during the test sequence.
- The time of injection is synchronized with the position of the high pressure pump to ensure a maximum stability of the injection supply pressure.
Technical data
- High pressure supply: 300 – 2200 bar
- Acoustic emission: < 72 dB
- Adjustable injector clamping force: 1 – 9 kN
- Adjustable fuel connection force: 1 – 9 kN
- Backleak pressure range: 0.1 – 5 bar
- Cycle time: 95 s (at three test points)
