System for controlling safety device for vehicle

Claim 1

A system for controlling a safety device for a vehicle, comprising: (a) first and second switching means connected to a power source in serial relation to said safety device; (b) first and second acceleration sensors for respectively producing analog deceleration signals representative of the deceleration of said vehicle; (c) first and second analog processing circuits for respectively processing said deceleration signals fed respectively from said first and second acceleration sensors, each of said analog processing circuits including an integrating circuit for integrating a respective one of said deceleration signals, and a comparator circuit for comparing an integral value, outputted from said integrating circuit, with a first reference level and for outputting a first collision decision signal when said integral value exceeds said first reference value; (d) first and second analog-to-digital converters for respectively converting said analog deceleration signals, fed respectively from said first and second acceleration sensors, into digital form; (e) microcomputer means for performing calculations of integration of the deceleration respectively in accordance with said digitalized deceleration signals, fed respectively from said first and second digital-to-analog converters, to produce integral values, said microcomputer means comparing said integral values with a second reference level, and outputting second collision decision signals respectively from its first and second output ports when said integral values exceed said second reference level; (f) first logic means for outputting a first instruction signal to turn on said first switching means when said first logic means simultaneously receives any one of said two first collision decision signals from said two analog processing circuits and one of said second collision decision signals from said first and second output ports of said microcomputer means; and (g) second logic means for outputting a second instruction signal to turn on said second switching means when said second logic means simultaneously receives the other one out of said two first collision decision signals and the other one of said two second collision decision signals.

Claim 2

A system for controlling a safety device for a vehicle, comprising: (a) first and second switching means connected to a power source in serial relation to said safety device; (b) first and second acceleration sensors for respectively producing analog deceleration signals representative of the deceleration of said vehicle; (c) first and second analog processing circuits for respectively processing said deceleration signals fed respectively from said first and second acceleration sensors, each of said analog processing circuits including an integrating circuit for integrating a respective one of said deceleration signals, and a comparator circuit for comparing an integral value, outputted from said integrating circuit, with a first reference level and for outputting a first collision decision signal when said integral value exceeds said first reference value; (d) first and second analog-to-digital converters for respectively converting said analog deceleration signals, fed respectively from said first and second acceleration sensors, into digital form; (e) microcomputer means for performing calculations of integration of the deceleration respectively in accordance with said digitalized deceleration signals, fed respectively from said first and second digital-to-analog converters, to produce integral values, said microcomputer means comparing said integral values with a second reference level, and outputting second collision decision signals respectively from its first and second output ports when said integral values exceed said second reference level; (f) first logic means for outputting a first instruction signal to turn on said first switching means when said first logic means simultaneously receives any one of said two first collision decision signals from said two analog processing circuits and one of said second collision decision signals from said first and second output ports of said microcomputer means; and (g) second logic means for outputting a second instruction signal to turn on said second switching means when said second logic means simultaneously receives the other one out of said two first collision decision signals and the other one of said two second collision decision signals.