Passenger sensing system
First Claim
1. A passenger sensing system comprising a background heat source unit including a plurality of heat sources arranged substantially at a fixed interval, the background heat source unit being set to a temperature different from the body temperature of a passenger and also from the ambient temperature, an infrared sensor facing the background heat source unit, for detecting the temperature of the heat sources, and a control circuit for checking whether a passenger is present according to the result of a check, made by comparing a detected temperature pattern of the background heat source unit, detected by the infrared sensor, and a preliminarily stored reference temperature pattern of the background heat source unit, also whether a non-identical area is present in the compared temperature patterns.
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Accused Products
Abstract
A background heat source unit 4 having a plurality of heat sources, which are arranged substantially at a fixed interval and set to a temperature different from the body temperature of passenger and also from the ambient temperature, and an infrared sensor 7, are disposed such that they face each other via a passenger. Whether a passenger is present is checked according to the result of a check, made by comparing a detected temperature pattern of the background heat source unit 4, detected by the infrared sensor 7, and a reference temperature pattern of the background heat source unit 4, preliminarily stored in a control circuit 17, as to whether a non-identical area is present in the compared temperature patterns.
20 Citations
18 Claims
- 1. A passenger sensing system comprising a background heat source unit including a plurality of heat sources arranged substantially at a fixed interval, the background heat source unit being set to a temperature different from the body temperature of a passenger and also from the ambient temperature, an infrared sensor facing the background heat source unit, for detecting the temperature of the heat sources, and a control circuit for checking whether a passenger is present according to the result of a check, made by comparing a detected temperature pattern of the background heat source unit, detected by the infrared sensor, and a preliminarily stored reference temperature pattern of the background heat source unit, also whether a non-identical area is present in the compared temperature patterns.
- 3. A passenger sensing system comprising a background heat source unit including a plurality of heat sources arranged substantially at a fixed interval, the background heat source unit being set to a temperature different from the body temperature of a passenger and also from the ambient temperature, an infrared sensor facing the background heat source unit, for detecting the temperature of each of the heat sources, a body temperature detecting circuit for extracting a body temperature pattern of a passenger from the detected temperature pattern from the infrared sensor, and control circuit for checking whether a passenger is present according to the output signals from the infrared sensor and the body temperature detecting circuit, wherein the control circuit checks whether a passenger is present according to the result of a check, made by comparing a detected temperature pattern of the background heat source unit, detected by the infrared sensor, and a reference temperature pattern of the background heat source unit, preliminarily stored in it, as to whether a non-identical area is present in the compared temperature patterns and, when a non-identical area is present, checks whether a passenger is present by checking, according to output signal from the body temperature detecting circuit, whether a body temperature area is present in the non-identical area.
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5. A passenger sensing system comprising a background heat source unit including a plurality of heat sources arranged substantially at a fixed interval, the background heat source unit being set to a temperature different from the body temperature of a passenger and also from the ambient temperature, an infrared sensor facing the background heat source unit, for detecting the temperature of each of the heat sources, a control circuit for checking whether a passenger is present according to the result of a check, made by comparing a detected temperature pattern of the background heat source unit, detected by the infrared sensor, and a preliminarily stored reference temperature pattern of the background heat source unit, as to whether a non-identical area is present in the compared temperature patterns, and an air bag unit having a function of expanding an air bag in response to a collision of the car, wherein the air bag of the air bag unit is set, according to check result data transmitted from the control circuit to the air bag unit, such that it is ready to be expanded or that its expansion is prohibited.
- 6. A passenger sensing system comprising a background heat source unit including a plurality of heat sources arranged substantially at a fixed interval, the background heat source unit being set to a temperature different from the body temperature of a passenger and also from the ambient temperature, an infrared sensor facing the background heat source unit, for detecting the temperature of each of the heat sources, a control circuit for comparing a detected temperature pattern of the background heat source unit, detected by the infrared sensor, and a preliminarily stored reference temperature pattern of the background heat source unit, and checking, when a non-identical area is present in the compared temperature patterns, whether a passenger is present by checking, according to output signal from the body temperature detecting circuit, whether a body temperature area is present in the non-identical area, and an air bag unit having a function of expanding air bag in response a collision of the car, wherein the air bag in the air bag unit is set, according to check result data transmitted from the control circuit to the air bag unit, such that it is ready for expansion or that its expansion is prohibited.
- 14. A passenger sensing method using a background heat source unit having a predetermined temperature pattern and an infrared sensor, the background heat source unit and the infrared sensor being disposed such that they face each other, the method comprising the steps of comparing a detected temperature pattern of the background heat source unit, detected by the infrared sensor, and a reference temperature pattern of the sole background heat source unit, and checking whether a passenger is present by checking whether as non-identical area is present in the compared temperature patterns.
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18. A passenger sensing method using a background heat source unit having a predetermined temperature pattern and an infrared sensor, the background heat source unit and the infrared sensor being disposed such that they face each other, and comprising the steps of comparing a detected temperature pattern of the background heat source unit, detected by the infrared sensor, and a reference temperature pattern of the sole background heat source unit, checking whether a passenger is present by checking whether a temperature pattern is present in the non-identical area, and transmitting check result signal to an air bag unit to set an air bag in the air bag unit such that the air bag is ready for expansion or that expansion of the air bag is prohibited.
Specification