Classification method for an injector, calibration method for a characteristic map of an injector, and test bench device for an injector

A calibration method of a characteristic diagram of an injector, comprising:

• providing a standard characteristic diagram of the injector,
• classifying the injector by a process comprising:
• actuating the injector with a predefinable test control signal,
• detecting a quantity of fluid output by the injector based on the test control signal, and
• classifying the injector based on the quantity of fluid output by the injector, and
• calibrating the standard characteristic diagram of the injector based on the classification.

A test bench device of an injector, comprising:

• a securing device for the injector, and
• an electronic actuation system to actuate the injector with a test control signal with a quantity of fluid associated therewith,
• wherein the test bench device is configured to classify the injector by:
• actuating the injector with the test control signal,
• detecting a quantity of fluid output by the injector based on the test control signal,
• comparing the detected quantity of fluid output by the injector with a quantity of fluid associated with the test control signal,
• classifying the injector based on the quantity of fluid output by the injector by determining a quantity class of the injector based on the comparison,
• determining an offset time of the injector based on the determined quantity class,
• determining a necessary control signal to obtain a desired fluid output based on the quantity classification of the injector, and
• accounting for any injector with a reduced stroke by adjusting the current level or the duration of the test control signal to determine the necessary control signal to yield a desired fluid output.

A classification method for an injector to determine an appropriate control signal to obtain a desired fluid output by the injector, the method comprising:

• actuating the injector with a test control signal having a duration and a quantity of fluid associated therewith,
• detecting a quantity of fluid output by the injector that differs from the quantity of fluid associated with the test control signal,
• comparing the detected quantity of fluid output by the injector with the quantity of fluid associated with the test control signal,
• classifying the injector based on the comparison,
• determining an offset time of the injector based on the classification,
• determining the appropriate control signal to obtain a desired fluid output based on the classification of the injector, wherein the appropriate control signal comprises a signal having a duration different from that of the test control signal, and
• accounting for any injector with a reduced stroke by adjusting the current level or the duration of the test control signal to determine the necessary control signal to yield a desired fluid output.