Arrangement for detecting a crash
First Claim
1. A crash detection arrangement, to be installed in a motor vehicle, for detecting a crash and providing a control signal for controlling a safety device in the event that a crash is detected, the arrangement comprising an accelerometer and a control unit, the accelerometer being arranged to supply a signal to the control unit which is indicative of the acceleration of the vehicle, the control unit is configured to:
- continuously update a classification parameter based on the value of the signal from the accelerometer over a sliding time window spanning a fixed classification time period,determine that a predetermined initiation criterion independent of the classification parameter is fulfilled;
upon determining that the initiation criterion was fulfilled, modify a threshold value of a crash evaluation algorithm in dependence upon the classification parameter, wherein the classification parameter is the classification parameter last calculated from a time window that includes an interval of time before the initiation criterion was fulfilled, and wherein the threshold value is set to be equal to a low threshold value when the classification parameter indicates that the rise in acceleration before fulfillment of the initiation criterion is relatively fast, and to be equal to a high threshold value when the classification parameter indicates that the rise in acceleration before fulfillment of the initiation criterion is relatively slow; and
determine an evaluation parameter with the crash evaluation algorithm upon fulfillment of the initiation criterion;
determine that the evaluation parameter has exceeded the threshold value; and
produce the control signal upon determining that the evaluation parameter has exceeded the threshold value.
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Accused Products
Abstract
A crash detection arrangement, to be installed in a motor vehicle, for detecting a crash and providing a control signal for controlling a safety device in the event that a crash is detected, the arrangement comprising an accelerometer and a control unit, the accelerometer being arranged to supply a signal to the control unit which is indicative of the acceleration of the vehicle, the control unit being adapted to: calculate a classification parameter based on the value of the signal from the accelerometer during a classification time period, which includes an interval of time before an initiation criterion was fulfilled; modify a crash evaluation algorithm in dependence upon the classification parameter; and perform the crash evaluation algorithm upon fulfillment of the initiation criterion to produce the control signal.
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Citations
22 Claims
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1. A crash detection arrangement, to be installed in a motor vehicle, for detecting a crash and providing a control signal for controlling a safety device in the event that a crash is detected, the arrangement comprising an accelerometer and a control unit, the accelerometer being arranged to supply a signal to the control unit which is indicative of the acceleration of the vehicle, the control unit is configured to:
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continuously update a classification parameter based on the value of the signal from the accelerometer over a sliding time window spanning a fixed classification time period, determine that a predetermined initiation criterion independent of the classification parameter is fulfilled; upon determining that the initiation criterion was fulfilled, modify a threshold value of a crash evaluation algorithm in dependence upon the classification parameter, wherein the classification parameter is the classification parameter last calculated from a time window that includes an interval of time before the initiation criterion was fulfilled, and wherein the threshold value is set to be equal to a low threshold value when the classification parameter indicates that the rise in acceleration before fulfillment of the initiation criterion is relatively fast, and to be equal to a high threshold value when the classification parameter indicates that the rise in acceleration before fulfillment of the initiation criterion is relatively slow; and determine an evaluation parameter with the crash evaluation algorithm upon fulfillment of the initiation criterion; determine that the evaluation parameter has exceeded the threshold value; and produce the control signal upon determining that the evaluation parameter has exceeded the threshold value. - 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 crash detection arrangement, to be installed in a motor vehicle, for detecting a crash and providing a control signal for controlling a safety device in the event that a crash is detected, the arrangement comprising an accelerometer and a control unit, the accelerometer being arranged to supply a signal to the control unit which is indicative of the acceleration of the vehicle, the control unit is configured to:
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calculate a classification parameter based on the value of the signal from the accelerometer during a classification time period, which includes an interval of time before an initiation criterion was fulfilled; modify a threshold value of a crash evaluation algorithm in dependence upon the classification parameter, wherein the threshold value is set to be equal to a low threshold value when the classification parameter indicates that the rise in acceleration before fulfillment of the initiation criterion is relatively fast, and to be equal to a high threshold value when the classification parameter indicates that the rise in acceleration before fulfillment of the initiation criterion is relatively slow; and determine an evaluation parameter with the crash evaluation algorithm upon fulfillment of the initiation criterion; determine that the evaluation parameter has exceeded the threshold value; and produce the control signal upon determining that the evaluation parameter has exceeded the threshold value; wherein the control signal comprises an actuation signal, and wherein the classification parameter is based at least partly on an integration of the sensed value of acceleration during the classification time period, or on an average of the sensed value of acceleration during the classification time period; and wherein the threshold value is proportional to the classification parameter.
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22. A crash detection method for detecting whether a vehicle is involved in a crash and providing a control signal for controlling of a safety device in the event that a crash is detected, the method comprising the step of:
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providing an accelerometer which supplies a signal which is indicative of the acceleration of the vehicle; continuously updating a classification parameter based on the value of the signal from the accelerometer over a sliding time window spanning a fixed classification time period; determining that a predetermined initiation criterion independent of the classification parameter is fulfilled; upon determining that the initiation criterion was fulfilled, modifying a threshold value of a crash evaluation algorithm in dependence upon the classification parameter; and upon exceeding the threshold value, producing the control signal.
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Specification