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Vehicle crash detection for implementation with low cost microprocessor










Image Number 2 for United States Patent #5758301.

The deceleration of a vehicle on receiving an impact is detected to produce an analog deceleration signal, which is converted to digital samples. The digital samples that occur during a successively shifted window are integrated to produce a velocity signal. The analog deceleration signal is passed through an analog bandpass filter to extract frequency components which appear uniquely on receiving the impact The bandpass-filtered signal is converted to a digital bandpass-filtered signal which is converted to a first impact energy signal having an absolute digital value and the velocity signal is differentiated to produce a second impact energy signal. The first and second impact energy signals are compared with first and second threshold values and first and second decision outputs are produced when the first and second impact energy signals are respectively higher than the first and second threshold values. The velocity signal is compared with a third threshold value and a third decision output is produced when the velocity signal is higher than the third threshold value. An occupant restraint system is operated in response to the simultaneous presence of the first and third decision outputs and in response to the simultaneous presence of the second and third decision outputs. In a preferred embodiment, the velocity signal is further compared with a fourth threshold value and a fourth decision output is produced when the velocity signal is higher than the fourth threshold value. The occupant restraint system is operated in response to the simultaneous presence of the second and fourth decision outputs, instead of to the simultaneous presence of the second and third decision outputs.








 
 
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