Passenger detection device of automobile

Abstract

A passenger detection device of an automobile that can easily detect a passenger's weight is provided. The passenger detection device of an automobile includes: a weight sensor module for detecting a first voltage difference value and a first temperature at a first point of a seat; and a smart sensor module for detecting a second voltage difference value and a second temperature at a second point of the seat, calculating a final weight of the first and second voltage difference values using the first and second temperatures, and detecting a passenger by comparing the final weight and a setting reference.

1 - 10 . (canceled) 
   
   
       11 . A passenger detection device of an automobile, comprising:
 a weight sensor module for detecting a first voltage difference value and a first temperature at a first point of a seat; and   a smart sensor module for detecting a second voltage difference value and a second temperature at a second point of the seat, calculating a final weight according to preset temperature correction values corresponding to the first and second temperatures and the first and second voltage difference values, and detecting a passenger by comparing the final weight and a reference setting.   
   
   
       12 . The passenger detection device of  claim 11 , wherein the weight sensor module comprises:
 a first sensing unit for detecting first and second voltage values and the first temperature at the first point; and   a first level amplification unit for outputting the first voltage difference value, which is a difference value between the first and second voltage values, and correcting a zero point of the first voltage difference value.   
   
   
       13 . The passenger detection device of  claim 12 , wherein the first level amplification unit comprises:
 a first amplification unit for amplifying the difference value between the first and second voltage values and outputting the first voltage difference value; and   a first correction unit for correcting and outputting a zero point of the first voltage difference value.   
   
   
       14 . The passenger detection device of  claim 12 , wherein the first sensing unit comprises:
 a first semiconductor gauge for detecting the first and second voltage values; and   a first temperature detection unit for detecting the first temperature at one of the inside and the outside of the first semiconductor gauge.   
   
   
       15 . The passenger detection device of  claim 14 , wherein in the first semiconductor gauge, first, second, third, and fourth semiconductor resistors having varying resistance values are connected in a bridge form, and power is supplied to a first contact point at which the first and third semiconductor resistors are connected, the first voltage value is output to a second contact point at which the first and second semiconductor resistors are connected, the second voltage value is output to a third contact point at which the third and fourth semiconductor resistors are connected, and a fourth contact point at which the second and fourth semiconductor resistors are connected is connected to the ground. 
   
   
       16 . The passenger detection device of  claim 11 , wherein the smart sensor module comprises:
 a second sensing unit for detecting third and fourth voltage values and the second temperature at the second point;   a second level amplification unit for outputting the second voltage difference value, which is a difference value between the third and fourth voltage values and correcting a zero point of the second voltage difference value; and   a controller for calculating a final weight based on the first and second voltage difference values, detecting a passenger by comparing the final weight and the reference setting, and supplying first and second zero point signals to the first and second level amplification units, respectively, in order to correct zero points of the first and second voltage difference values.   
   
   
       17 . The passenger detection device of  claim 16 , wherein the second level amplification unit comprises:
 a second amplification unit for amplifying and outputting the second voltage difference value, which is a difference value between the third and fourth voltage values; and   a second correction unit for correcting and outputting the zero point of the second voltage difference value.   
   
   
       18 . The passenger detection device of  claim 16 , wherein the second sensing unit comprises:
 a second semiconductor gauge for detecting the third and fourth voltage values; and   a second temperature detection unit for detecting the second temperature at one of the inside and the outside of the second semiconductor gauge.   
   
   
       19 . The passenger detection device of  claim 18 , wherein in the second semiconductor gauge, fifth, sixth, seventh, and eighth semiconductor resistors having varying resistance values are connected in a bridge form, and power is supplied to a fifth contact point at which the fifth and seventh semiconductor resistors are connected, the third voltage value is output to a sixth contact point at which the fifth and sixth semiconductor resistors are connected, the fourth voltage value is output to a seventh contact point at which the seventh and eighth semiconductor resistors are connected, and an eighth contact point at which the sixth and eighth semiconductor resistors are connected is connected to the ground. 
   
   
       20 . The passenger detection device of  claim 16 , wherein the controller comprises:
 a calculation unit for calculating the final weight through a lookup table having at least one temperature correction value, which is a value for compensating temperature change amount based on a reference temperature;   a zero point adjustment unit for supplying the first and second zero point signals corresponding to the first and second voltage difference values to the first and second level amplication units; and   a determination unit for comparing the final weight with the reference setting and determining whether the passenger is detected.