Method for operating a piezoelectric actuator as a sensor and a motor vehicle

A piezoelectric actuator and sensor technology, applied in the direction of machines/engines, engine components, combustion engines, etc., can solve the problems of low signal-to-noise ratio, loss, etc., to increase the signal-to-noise ratio, improve the ability, and reduce the defective rate Effect

Active Publication Date: 2021-02-02
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, those piezoelectric elements of injectors that develop a too low signal-to-noise ratio during their service life lose their ability to act as sensors

Method used

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  • Method for operating a piezoelectric actuator as a sensor and a motor vehicle
  • Method for operating a piezoelectric actuator as a sensor and a motor vehicle
  • Method for operating a piezoelectric actuator as a sensor and a motor vehicle

Examples

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Embodiment Construction

[0033] figure 1 A graph showing a typical injection pattern with a measurement pulse and a reference pulse. In this context, a first pilot injection, a second pilot injection and a main injection are assumed. Measurement pulses are generated at locations where the usable signal to be measured is expected. Then, a reference pulse corresponding to the measurement pulse is generated.

[0034] figure 2 The change in the position of the measurement pulse is shown in the corresponding figure.

[0035] image 3 The processed signal of a measurement pulse of an injector with a high signal-to-noise ratio is shown. The different curves relate to different positions of the measurement pulses (see also figure 2 ).

[0036] This is an injector whose signal has only very little noise due to charging of the piezoelectric actuator. This can be recognized from the fact that when the relative position of the measurement pulse changes (the phase relationship between the closing of the ...

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Abstract

The present invention describes a method for operating a piezoelectric actuator as a sensor in a piezo-operated injector, wherein the connection between the piezoelectric actuator and the servo is eliminated by partially charging the piezoelectric actuator. Air gap between valves. Measurement pulses are generated at locations where the usable signal to be measured is expected. Then, a reference pulse corresponding to the measurement pulse is generated in the same period. The voltage signal difference is obtained by subtracting the actuator voltage measured during the reference pulse from the actuator voltage measured during the measurement pulse, which is used as the A usable signal for force measurement, the piezoelectric actuator operates as a sensor. Furthermore, a motor vehicle is specified which has a control unit designed to carry out such a method.

Description

technical field [0001] The invention relates to a method for operating a piezoelectric actuator as a sensor in a piezoelectrically operated injector, in particular in a diesel common rail injector, wherein the partial charging of the piezoelectric actuator eliminates the Air gap between piezo actuator and servo valve. Background technique [0002] Standard injectors, especially diesel common rail injectors, have an actuator that directly or indirectly (under servo operation) activates the nozzle needle. The use of piezoelectric elements as actuators has the advantage here that they can also be used as sensors in order to detect characteristic events, such as, for example, the closing time of a nozzle needle. This information can be used to control the injector and in this way improve the accuracy of the injection. [0003] In piezoelectric servo injectors, piezoelectric actuators are used to open the servo valve by means of the inverse piezoelectric effect, which in turn l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/20
CPCF02M57/005F02D41/402F02D2041/2055F02D2041/286F02D41/2096Y02T10/40F02M51/0603
Inventor J.拉德茨基M.沙伊德
Owner VTESCO TECH GMBH
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