| 摘要 |
A method and a device correct a temperature-dependent length change of an actuator unit (3) disposed in a housing (2) of a fuel injector (1). A known method of maintaining an idle stroke (L) formed between the actuator unit (3) and a control valve of the fuel injector involves compensating for a temperature-dependent length change by measuring the capacity of the actuator unit (3) and thereby determining the temperature (Ta). However, in the process an additional test impulse is used to trigger the actuator unit (3). Therefore, it is proposed to forego the use of a test impulse and to measure the capacity (CA-PA) directly at an active trigger impulse. The method is much more precise and reliable since the current operating parameters, such as fuel pressure, fuel temperature and actuation energy, among others, are taken into account.
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