Measuring temperature-dependent length changes in piezo actuator for injection drive in motor vehicle fuel injection system, using contactless laser triangulation

摘要

The temperature-dependent changes in length of a piezoelectric actuator (6) are measured in a contactless manner. This may be performed by laser triangulation. The changes in length of the actuator and the housing surrounding it may be measured. The actuator may be electrically excited during the measurement. An Independent claim is also included for an apparatus for measuring the temperature-dependent changes in length of a piezo actuator.