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Control system for vehicle safety devices

  • US 5,629,847 A
  • Filed: 12/22/1994
  • Issued: 05/13/1997
  • Est. Priority Date: 12/27/1993
  • Status: Expired due to Fees
First Claim
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1. A control system for controlling activation of a vehicle safety device in response to an acceleration signal from a detecting means for detecting vehicle acceleration, said system comprising:

  • first evaluation means for calculating from the acceleration signal a first evaluation value related to vehicle speed change,second evaluation means for calculating from the acceleration signal a second evaluation value related to passenger position change,third evaluation means for squaring the value of the acceleration signal and calculating from the squared value a third evaluation value related to collision energy magnitude,operation control means for starting and stopping the calculations in the first to third evaluation means in response to the acceleration signal, anddecision means for deciding whether or not to activate the vehicle safety device in response to the first to third evaluation values calculated under the control of the operation control means,wherein the first evaluation means comprises a first calculation means responsive to the operation control means for integrating the acceleration signal and outputting the integrated value as a first output, and a first correction means for correcting the first output to obtain the first evaluation value indicating vehicle speed change,and wherein the first correction means comprises a first map calculation means responsive to the acceleration signal for calculating from a mad a threshold value for the first output at the current vehicle acceleration value, and a first rate calculation means for calculating the ratio of the first output to the threshold value calculated by the first map calculation means and for outputting the calculated ratio as the first evaluation value.

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