Method and control unit for operating an injection valve
First Claim
1. A method for operating an injection valve of a motor vehicle, a first component of the injection valve being disposed in a manner allowing movement relative to a second component of the injection valve and being drivable at least partially by an actuator, comprising:
- detecting a structure-borne-noise signal by a structure-borne-noise sensor; and
evaluating the structure-borne-noise signal to infer an operating state of the first component, the operating state indicating one of whether the first component has struck a further component of the injection valve and whether an onset of a carrying-along of the first component has occurred.
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Accused Products
Abstract
In a method for operating an injection valve, in particular a fuel injector of an internal combustion engine of a motor vehicle, one component of the injection valve, particularly a valve needle, is disposed in a manner allowing movement relative to other components of the injection valve, and preferably is able to be driven at least partially by an actuator. A structure-borne-noise signal is detected by a structure-borne-noise sensor, and the structure-borne-noise signal is evaluated in order to infer an operating state of the movably disposed component.
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Citations
22 Claims
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1. A method for operating an injection valve of a motor vehicle, a first component of the injection valve being disposed in a manner allowing movement relative to a second component of the injection valve and being drivable at least partially by an actuator, comprising:
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detecting a structure-borne-noise signal by a structure-borne-noise sensor; and evaluating the structure-borne-noise signal to infer an operating state of the first component, the operating state indicating one of whether the first component has struck a further component of the injection valve and whether an onset of a carrying-along of the first component has occurred. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for operating an injection valve of a motor vehicle, a first component of the injection valve being disposed in a manner allowing movement relative to a second component of the injection valve and being drivable at least partially by an actuator, comprising:
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detecting a structure-borne-noise signal by a structure-borne-noise sensor; and evaluating the structure-borne-noise signal to infer an operating state of the first component, wherein the evaluation of the structure-borne-noise signal includes at least one;
(a) filtering of the structure-borne-noise signal by at least one of (i) a high-pass filtering and (ii) a band-pass filtering, to obtain a filtered structure-borne-noise signal;
(b) ascertaining a power density spectrum of the structure-borne-noise signal;
(c) ascertaining a signal energy of the structure-borne-noise signal;
(d) generating an absolute value and integrating the absolute value of the structure-borne-noise signal; and
(e) correlating the structure-borne-noise signal with a reference signal. - View Dependent Claims (15, 16)
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17. A method for operating an injection valve of a motor vehicle, a first component of the injection valve being disposed in a manner allowing movement relative to a second component of the injection valve and being drivable at least partially by an actuator, comprising:
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detecting a structure-borne-noise signal by a structure-borne-noise sensor; and evaluating the structure-borne-noise signal to infer an operating state of the first component, wherein at least one test activation of the actuator is carried out, during which in each instance the actuator receives different control signals, a plurality of structure-borne-noise signals corresponding in each case to different test activations being obtained, and an operating state of the first component being inferred from the plurality of structure-borne-noise signals, the method further comprising;
preselecting a starting value, representing a minimum value, for an activation parameter of the actuator, the activation parameter including an activation period;
a) implementing a first test activation using the preselected starting value for the activation parameter;
b) acquiring a structure-borne-noise signal resulting during the first test activation;
c) increasing the activation parameter according to a specifiable test scheme, an altered activation parameter being obtained;
d) implementing a further test activation using the altered activation parameter;
e) acquiring a structure-borne-noise signal resulting during the further test activation;
f) repeating d), e), and f) until a specifiable abort criterion is reached. - View Dependent Claims (18, 19, 20)
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21. A system, comprising:
- a control unit adapted to operate an injection valve of a motor vehicle, a first component of the injection valve being disposed in a manner allowing movement relative to a second component of the injection valve and being drivable at least partially by an actuator, the control unit executing the following;
detecting a structure-borne-noise signal by a structure-borne-noise sensor; and evaluating the structure-borne-noise signal to infer an operating state of the first component, the operating state indicating one of whether the first component has struck a further component of the injection valve and whether an onset of a carrying-along of the first component has occurred. - View Dependent Claims (22)
- a control unit adapted to operate an injection valve of a motor vehicle, a first component of the injection valve being disposed in a manner allowing movement relative to a second component of the injection valve and being drivable at least partially by an actuator, the control unit executing the following;
Specification