Device for recording the instant at which injection starts in an injection valve
First Claim
1. In an internal combustion engine having an injection valve actuated by a current through the injection valve, a device for recording an instant at which injection starts in the injection valve, comprising:
- a differentiating device connected to the injection valve for receiving current through the injection valve by which the injection valve is actuated and emitting an output signal corresponding to a second derivative of the current with respect to time;
a threshold value stage connected to said differentiating device for receiving the output signal and generating a threshold signal whenever the output signal exceeds a threshold value; and
a logic device connected to said threshold value stage for recognizing the instant at which injection starts when the threshold signal occurs for a second time after a triggering instant of the injection valve.
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Accused Products
Abstract
An internal combustion engine has an injection valve. A device for recording an instant at which injection starts in the injection valve includes a differentiating device connected to the injection valve for receiving current through the injection valve and emitting an output signal corresponding to a second derivative of a variation in current with respect to time. A threshold value stage is connected to the differentiating device for receiving the output signal and generating a threshold signal whenever the output signal exceeds a threshold value. A logic device is connected to the threshold value stage for recognizing the instant at which injection starts when the threshold signal occurs for a second time after a triggering instant of the injection valve.
21 Citations
6 Claims
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1. In an internal combustion engine having an injection valve actuated by a current through the injection valve, a device for recording an instant at which injection starts in the injection valve, comprising:
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a differentiating device connected to the injection valve for receiving current through the injection valve by which the injection valve is actuated and emitting an output signal corresponding to a second derivative of the current with respect to time; a threshold value stage connected to said differentiating device for receiving the output signal and generating a threshold signal whenever the output signal exceeds a threshold value; and a logic device connected to said threshold value stage for recognizing the instant at which injection starts when the threshold signal occurs for a second time after a triggering instant of the injection valve. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification