Vehicle rollover detection system
First Claim
1. A method of providing for detecting a rollover condition in a vehicle, comprising:
- a. providing for acquiring a measure of lateral acceleration of the vehicle;
b. providing for acquiring a measure of angular velocity of the vehicle;
c. providing for determining a figure of merit responsive to said measure of lateral acceleration and said measure of angular velocity;
d. providing for determining a time of inception responsive to at least one of said measure of lateral acceleration and said measure of angular velocity;
e. providing for determining a period of time commencing with said time of inception;
f. providing for determining a figure of merit threshold as a function of said period of time; and
g. providing for detecting the rollover condition by comparing said figure of merit with said figure of merit threshold.
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Accused Products
Abstract
A rollover condition is detected responsive to the comparison of a figure of merit with a threshold, wherein the threshold is given generally as a function of a period of time commencing with a time of inception determined from one or both of a measure of lateral acceleration and a measure of angular velocity. The measures of lateral acceleration and angular velocity are filtered, and are compensated to remove offset errors. In one embodiment, the figure of merit comprises a measure function that incorporates a damping term and a product term. The product term comprises a force measure and a kinetic energy measure, wherein the force measure is responsive to the measure of lateral acceleration, and the kinetic energy measure is responsive to the measure of angular velocity. The product term may further comprise a potential energy measure that is responsive to a measure of roll angle.
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Citations
70 Claims
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1. A method of providing for detecting a rollover condition in a vehicle, comprising:
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a. providing for acquiring a measure of lateral acceleration of the vehicle;
b. providing for acquiring a measure of angular velocity of the vehicle;
c. providing for determining a figure of merit responsive to said measure of lateral acceleration and said measure of angular velocity;
d. providing for determining a time of inception responsive to at least one of said measure of lateral acceleration and said measure of angular velocity;
e. providing for determining a period of time commencing with said time of inception;
f. providing for determining a figure of merit threshold as a function of said period of time; and
g. providing for detecting the rollover condition by comparing said figure of merit with said figure of merit threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method of providing for detecting a rollover condition in a vehicle, comprising:
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a. providing for acquiring a measure of lateral acceleration;
b. providing for acquiring a measure of roll rate;
c. providing for determining if a first memory has been set indicating the activation of a first rollover detection algorithm, and if said first memory has not been set, then providing for determining from at least one of said measure of lateral acceleration and said measure of roll rate, if a first entrance criteria is satisfied for said first rollover detection process, and if said first entrance criteria is satisfied, then performing a set of initialization operations comprising;
i. setting said first memory indicating the activation of a first rollover detection algorithm; and
ii. initializing at least one second memory associated with said first rollover detection algorithm;
d. providing for determining if a first exit criteria is satisfied for said first rollover detection process, and if said first exit criteria is satisfied, then resetting said first memory;
e. if said first memory has been set, then providing for determining or acquiring a measure of roll angle;
f. if said first memory has been set, then providing for determining a detection measure of said rollover condition responsive to at least two of said measure of lateral acceleration, said measure of roll rate, and said measure of roll angle; and
g. providing for detecting said rollover condition responsive to said detection measure. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70)
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Specification