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

Patent metadata

Field	Value
Publication number	US-9284905-B2
Application number	US-201013512698-A
Country	US
Kind code	B2
Filing date	Nov 24, 2010
Priority date	Nov 30, 2009
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

A classification method for an injector may include: actuating the injector by means of a predefinable test control signal, detecting a quantity of liquid dispensed by the injector on the basis of the test control signal, classifying the injector as a function of the detected dispensed quantity of liquid, and determining a required control signal on the basis of the classification of the injector considering a reduced injector stroke. A calibration method for a characteristic map of an injector, and a test bench device for performing the injector classification method are also provided.

First claim

What is claimed is:

1. A classification method for an injector, the method comprising:
actuating the injector with a test control signal having a current level and a duration,
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 a necessary control signal to yield a desired fluid output based on the classification of the injector,
determining an offset time of the injector based on the determined quantity class, 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.

2. The classification method of claim 1 , wherein based on the test control signal, the injector outputs a quantity of fluid which is larger than a quantity of fluid associated with the test control signal.

3. The classification method of claim 1 , further comprising storing the necessary control signal in a control unit.

4. The classification method of claim 1 , wherein the injector is configured for use in a common rail injection system.

5. The classification method of claim 1 , wherein the injector is a piezo injector or a solenoid injector.

6. The classification method of in claim 1 , wherein the step of determining the necessary control signal comprises forming a difference between a test actuation duration associated with the test control signal and the determined offset time of the injector.

7. The classification method of claim 6 , wherein the reduced injector stroke is taken into account by adding a correction time to the difference which is formed.

8. The classification method of claim 6 , wherein the necessary control signal comprises an actuation duration different from that of the test signal.

9. 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.

10. The calibration method of claim 9 , wherein the standard characteristic diagram was selected based on a quantity classification of the injector.

11. 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.

12. 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.

Assignees

• Jung Uwe
• Continental Automotive Gmbh

Inventors

• Jung Uwe

Classifications

• F02D41/2096

  for controlling piezoelectric injectors (drive and control circuit for piezoelectric devices in general H10N30/802) · CPC title

• F02D41/2435

  characterised by the writing medium, e.g. bar code · CPC title

• F02M65/001

  Measuring fuel delivery of a fuel injector · CPC title

• F02D41/2432

  Methods of calibration · CPC title

• F02D41/2467 Primary

  for injectors · CPC title