Method and device for operating an injection valve

摘要

In a method for operating an injection valve having a longitudinal axis, an injection needle, a control valve and an actuator embodied as a solid body actuator, wherein the actuator acts on the control valve and the control valve acts on the injection nozzle, various pre-defined quantities of electrical energy are supplied to the actuator in a plurality of adaptation flows in order to modify an axial length of the actuator. This electrical energy is defined such that an axial position of the injection nozzle remains unchanged. In correlation with the respective adaptation flow, and following the energy supply associated with the respective adaptation flow, a first and second voltage value are detected and a voltage differential value is then determined which is compared with a pre-defined threshold value and, on the basis of the comparison, at least one control of the actuator is adapted to the injection of fluid.

主权项

1. A method for operating an indirectly-driven injection valve having a longitudinal axis, a nozzle needle in a valve space, a control valve in a control space and an actuator which is embodied as a solid actuator in an actuator space, wherein the actuator is designed to act on the control valve, and the control valve is designed to act on the nozzle needle, wherein the nozzle needle is designed to prevent, in a closed position, a flow of fluid through at least one injection opening and otherwise to enable the flow of fluid, the method comprising:
feeding different predefined quantities of electrical energy to the actuator in a plurality of adaptation passes in order to change an axial length of the actuator, for each respective adaptation pass:
after the predefined quantity of electrical energy which is assigned to the respective adaptation pass has been fed in, detecting a first and second voltage value across the actuator,determining a voltage difference value as a function of the first and second voltage values, andcomparing the voltage difference value with a predefined threshold value for that respective adaptation pass, determining, for a particular adaptation pass, that the voltage difference value is less than the predefined threshold value, which indicates that axial position of the nozzle needle remains unchanged throughout the feeding of the predefined quantity of electrical energy, and in response to such determination, discharging the actuator and executing a subsequent adaptation pass using a different predefined quantity of electrical energy, such that the particular adaptation pass involves electrically charging and discharging the actuator without causing an axial movement of the nozzle needle, and determining, for the subsequent adaptation pass, that the voltage difference value is greater than or equal to the predefined threshold value, and in response to such determination:
determining an energy offset value based on the predefined quantity of electrical energy assigned to that respective adaptation pass, andadapting at least one actuation of the actuator for injecting fluid as a function of the determined energy offset value.