Starting device for a passenger protecting device
First Claim
1. A starting device for a passenger protecting device outputting a starting signal based on an output signal of an acceleration sensor for detecting an acceleration in collision comprising:
- a band-pass filter for filtering a component of the output signal of the acceleration sensor in a specified frequency domain;
an absolute value calculating means for calculating an absolute value of an output signal of the band-pass filter;
an upper limit restricting means for restricting an output signal of the absolute value calculating means by a predetermined upper limit value;
a band-pass integrating means for integrating an output signal of the upper limit restricting means; and
a comparing means for comparing an output of the band-pass integrating means with a predetermined threshold value and outputting the starting signal.
3 Assignments
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Accused Products
Abstract
A starting device integrates an output signal of an acceleration sensor by a band-pass integrating means while restricting an upper limit of the output signal in a specified frequency range by an upper limit restricting means, and is provided with a comparing means for outputting a starting signal when the integrated value is larger than a predetermined threshold value. In this way, the starting device is certainly started by an acceleration waveform of collision that must start the device. Further, the device is not influenced by vibration components caused immediately after the beginning of collision with respect to a low-speed collision such as 8 mile/hour frontal collision that must not start the device.
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Citations
14 Claims
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1. A starting device for a passenger protecting device outputting a starting signal based on an output signal of an acceleration sensor for detecting an acceleration in collision comprising:
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a band-pass filter for filtering a component of the output signal of the acceleration sensor in a specified frequency domain; an absolute value calculating means for calculating an absolute value of an output signal of the band-pass filter; an upper limit restricting means for restricting an output signal of the absolute value calculating means by a predetermined upper limit value; a band-pass integrating means for integrating an output signal of the upper limit restricting means; and a comparing means for comparing an output of the band-pass integrating means with a predetermined threshold value and outputting the starting signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification