Vehicle crash determining apparatus
First Claim
1. A vehicle crash determining apparatus comprising:
- an acceleration sensor for detecting an impact at a time of crashing of a vehicle;
a first comparing means for comparing an output signal of said acceleration sensor and a first threshold value;
an integrating means for integrating an output of said first comparing means within a predetermined section while making a shift by a unit time;
a second comparing means for determining a necessity of starting an occupant protection means by comparing an integrated value of said integrating means with a second threshold value; and
a starting means for controlling a starting of said occupant protection means based on an output signal of said second comparing means.
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Accused Products
Abstract
A discrimination is made between a soft crashing in which a relatively low acceleration signal continues for a long period of time and a low-speed head-on crashing so that an air bag can be started at an appropriate timing. An occupant protecting apparatus for that purpose is made up of: a first comparator for comparing an output signal of an acceleration sensor which detects an impact at the time of crashing of a vehicle and a first threshold value; a second comparator for comparing an integrated value of an integrator which integrates an output of the first comparator within a predetermined section and a second threshold value while making a shift by a unit time within a predetermined section; and a starting device for controlling the starting of the air bag based on an output signal of the second comparator.
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Citations
5 Claims
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1. A vehicle crash determining apparatus comprising:
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an acceleration sensor for detecting an impact at a time of crashing of a vehicle;
a first comparing means for comparing an output signal of said acceleration sensor and a first threshold value;
an integrating means for integrating an output of said first comparing means within a predetermined section while making a shift by a unit time;
a second comparing means for determining a necessity of starting an occupant protection means by comparing an integrated value of said integrating means with a second threshold value; and
a starting means for controlling a starting of said occupant protection means based on an output signal of said second comparing means. - View Dependent Claims (3)
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2. A vehicle crash determining apparatus comprising:
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an acceleration sensor for detecting an impact at a time of crashing of a vehicle;
a first comparing means for comparing an output signal of said acceleration sensor with a first threshold value;
a subtracting means for subtracting a predetermined constant value from an output of said first comparing means;
an integrating means with a reset function for integrating an output of said subtracting means to thereby forcibly reset an integrated value thus obtained to zero when the integrated value falls below zero;
a second comparing means for determining a necessity of starting an occupant protection means by comparing said integrated value of said integrating means and a second threshold value; and
a starting means for controlling a starting of said occupant protection means based on an output signal of said second comparing means. - View Dependent Claims (4)
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5. A vehicle crash determining apparatus comprising:
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an acceleration sensor for detecting an impact at a time of crashing of a vehicle;
a first comparing circuit that compares an output signal of the acceleration sensor and a first threshold value;
an integrating circuit that integrates an output of the first comparing circuit within a predetermined section while making a shift by a unit time;
a second comparing circuit that determines a necessity of starting an occupant protection device by comparing an integrated value of the integrating circuit with a second threshold value; and
a starting circuit that starts the occupant protection device based on an output signal of the second comparing circuit.
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Specification