Apparatus for starting passive safety device of automotive vehicle
First Claim
1. An apparatus for starting a passive safety device of an automotive vehicle, said apparatus comprising:
- (a) sampling means for sampling a plurality of acceleration values, each acceleration value sampled after a first time interval;
(b) integration means, comprising;
means for calculating a sum of the sampled acceleration values over each of a plurality of first time intervals, wherein said first time intervals over which each sum of the sampled acceleration values is calculated are distinct from each other with no overlapping time;
means for calculating a plurality of said sums over a second time interval greater than one of said first time intervals;
means for storing the plurality of said sums in a corresponding number of data areas of memory; and
means for generating a value of an integral based on said stored sums over said second time interval;
(c) updating means for updating said integral value by adding a new acceleration value obtained after each first time interval to said integral value generated by said integration means after said new acceleration value is sampled by said sampling means; and
(d) starting means for starting the passive safety device when said updated integral value is detected to be greater than a threshold value.
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Abstract
A passive safety device starting apparatus includes: a sampling unit for sampling a plurality of acceleration values from an automotive vehicle according to periodic interrupt signals; an integration unit for calculating the sum of a plurality of acceleration values sampled within each of a plurality of first time intervals, for storing a number of the sums, each of which is calculated within a second time interval greater than one of the first time intervals, in a corresponding number of data areas of a memory, and for generating a value of an integral based on the number of the sums within each first time interval; and a starting unit for updating the integral value according to the periodic interrupt signals by adding a new acceleration value to the integral value generated by the integration unit after the new acceleration value is sampled by the sampling unit, and for starting a passive safety device when the updated integral value is detected to be greater than a threshold value.
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Citations
9 Claims
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1. An apparatus for starting a passive safety device of an automotive vehicle, said apparatus comprising:
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(a) sampling means for sampling a plurality of acceleration values, each acceleration value sampled after a first time interval; (b) integration means, comprising; means for calculating a sum of the sampled acceleration values over each of a plurality of first time intervals, wherein said first time intervals over which each sum of the sampled acceleration values is calculated are distinct from each other with no overlapping time; means for calculating a plurality of said sums over a second time interval greater than one of said first time intervals; means for storing the plurality of said sums in a corresponding number of data areas of memory; and means for generating a value of an integral based on said stored sums over said second time interval; (c) updating means for updating said integral value by adding a new acceleration value obtained after each first time interval to said integral value generated by said integration means after said new acceleration value is sampled by said sampling means; and (d) starting means for starting the passive safety device when said updated integral value is detected to be greater than a threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of starting a passive safety device of an automotive vehicle, comprising the steps of:
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(a) sampling a plurality of acceleration values from the vehicle, each acceleration value sampled after a first time interval; (b) calculating a sum of the sampled acceleration values over each of a plurality of first time intervals, wherein said first time intervals over which each sum of the sampled acceleration values is calculated are distinct from each other with no overlapping time; (c) calculating a plurality of said sums over a second time interval greater than one of said first time intervals; (d) storing the plurality of said sums in a corresponding number of data areas of memory; (e) generating a value of an integral based on said stored sums over said second time interval; (f) updating said integral value by adding a new acceleration value obtained after each first time interval to said integral value after said new acceleration value is sampled; and (g) starting the passive safety device when said updated integral value is detected to be greater than a threshold value. - View Dependent Claims (9)
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Specification