Device for determining the instant a vehicle makes contact with an impact object
First Claim
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1. A device for determining an instant a vehicle makes contact with an impact object, comprising:
- a determining arrangement for determining the instant of contact by approximating a signal derived from an acceleration signal using a quadratic function and by determining a zero point, wherein the instant of contact is determined by calculating the zero point of the quadratic function in reverse.
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Abstract
A device for determining the instant a vehicle makes contact with an impact object. The device determines the instant of contact by approximating a signal derived from an acceleration signal using a function.
12 Citations
25 Claims
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1. A device for determining an instant a vehicle makes contact with an impact object, comprising:
a determining arrangement for determining the instant of contact by approximating a signal derived from an acceleration signal using a quadratic function and by determining a zero point, wherein the instant of contact is determined by calculating the zero point of the quadratic function in reverse. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for determining an instant when a vehicle makes contact with an impact object, the method comprising:
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sensing an acceleration, using an acceleration sensor in a control unit, and generating an acceleration signal; providing the acceleration signal to an input of a microcontroller in the control unit; filtering the acceleration signal using a filter, and providing a function on which an approximating function is to be performed; performing the approximation based on interpolation points on an integrated acceleration signal; determining a vertex from the approximating function, wherein in a first approximation, the vertex determines the instant of contact to provide a first determined instant of contact; and determining another instant of contact by subtracting a period of time from a first determined instant of contact. - View Dependent Claims (22)
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23. A device for determining an instant when a vehicle makes contact with an impact object, comprising:
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a sensing arrangement, in a control arrangement, for sensing an acceleration and generating an acceleration signal, and providing the acceleration signal to an input of a microcontroller in the control unit; a filtering arrangement to filter the acceleration signal in a filtering operation, the filtering arrangement including a filter to provide a function on which an approximating function is to be performed; an approximating arrangement to provide an approximating function to approximate the instant of contact, based on interpolation points on an integrated acceleration signal; a vertex determining arrangement to determine a vertex from the approximating function; and a processing arrangement to determine another instant of contact by subtracting a period of time from a first determined instant of contact. - View Dependent Claims (24)
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25. A device for determining an instant a vehicle makes contact with an impact object, comprising:
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a sensing arrangement to sense an acceleration, using an acceleration sensor in a control unit, and generating an acceleration signal; a determining arrangement having an input to receive the acceleration signal; a filtering arrangement to filter the acceleration signal and to provide a function on which an approximating function is to be performed; wherein the control unit performs the approximation based on interpolation points on an integrated acceleration signal, determines a vertex from the approximating function, wherein in a first approximation, the vertex determines the instant of contact to provide a first determined instant of contact, and wherein another instant of contact is determined by subtracting a period of time from a first determined instant of contact in a backward calculation, wherein the filtering includes providing an integration of the acceleration signal to provide a lower-frequency function, and wherein the interpolation points are determined by threshold values and by the times at which the approximating function assumes the threshold values.
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Specification