Fuel injection valve's operating behavior determining device for fuel-injection system of internal combustion engine for e.g. petrol common rail system, has piezo-foil sensor arranged at component of fuel injection system

摘要

The device has a piezo-foil sensor (26) arranged at a component e.g. fuel-injection valve (18) and high-pressure line (25), of a fuel injection system, for determining an operational behavior of the fuel-injection valve. The piezo-foil sensor has a piezoelectric plastic foil and is connected with an evaluation unit e.g. chip on injector, arranged on the component. A control unit (23) evaluates a signal produced by the sensor. The plastic foil is surrounded by a metalized plastic foil. An independent claim is also included for a method for determining operating behavior of a fuel injection valve of a fuel-injection system for an internal combustion engine.