Passenger compartment state sensing apparatus

• US 6,113,137 A
• Filed: 10/16/1997
• Issued: 09/05/2000
• Est. Priority Date: 10/16/1996
• Status: Expired due to Term

• Current Assignee: Nippon Soken, Inc. (DENSO Corporation), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Nippon Soken, Inc. (DENSO Corporation), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Mizutani, Akitoshi, Nakano, Jiro, Uenaka, Hiroshi
• Primary Examiner(s): CULBRETH, ERIC D
• Application Number:
  US08/951,585
• Time in Patent Office: 1,055 Days
• Field of Search: 280/735, 280/734
• US Class Current: 280/735
• CPC Class Codes: B60R 21/01534 using electromagneticwaves, e.g. infrared
• CPC Class Codes: G01S 17/04 Systems determining the presence of a target
• CPC Class Codes: G01S 17/87 Combinations of systems using electromagnetic waves other than radio waves
• CPC Class Codes: G01S 17/88 Lidar systems specially adapted for specific applications
• CPC Class Codes: G01S 7/4802 using analysis of echo signal for target characterisation; Target signature; Target cross-section

Abstract

An apparatus which can accurately detect a state in a passenger compartment is provided. On the ceiling of a passenger compartment above the passenger seat, nine LEDs and three photodetectors are aimed downward, and infrared rays emitted from the LEDs are reflected by an object to be sensed and the reflected light beams are received by the photodetectors. A signal at a level corresponding to the distance to the object to be sensed is outputted from the photodetectors. A controller obtains a change with time in output of the photodetectors (i.e., motion speed from a differential value of the sensed distance, a displacement amount total from an integral value of the sensed distance, and a motion frequency), senses movement of the object to be sensed based thereon, determines whether the object to be sensed is a human, an animal, or other, and determines the kind of object. The controller then transmits a signal indicative of a result of the determination of the object to be sensed which is used to control how the vehicle'"'"'s air bag is inflated.

Claims

1. A passenger compartment state sensor comprising:

plurality of active emitter arrays, each being located in sensing proximity to a passenger compartment occupation area, and each for outputting directional radiation toward the occupation area so that a three-dimensional pattern of an object in the occupation area is formed by rays of the directional radiation reflected therefrom; and

detecting means for sensing movement peculiar to the object in the occupation area by sensing the reflected rays of the directional radiation output by the plurality of emitter arrays, for determination of an object type based on the three-dimensional pattern.

2. An apparatus according to claim 1, wherein the detecting means detects the reflected rays of directional radiation so that the object may be classified as one of a human, an animal, and other.

3. An apparatus according to claim 1, wherein the detecting means is for sensing movement of a plurality of objects to be sensed.

4. The system of claim 1, wherein each of the plurality of emitter arrays comprises a plurality of linearly-arranged LEDs for generating infrared radiation according to a predetermined pattern, and the detecting means comprises a photodetector integrally arranged with the plurality of LEDs for detecting rays of infrared radiation reflected from the object.

5. The system of claim 4, wherein the plurality of LEDs and the photodetector together form a linear sensor assembly.

6. The system of claim 5, wherein each of the plurality of linear sensor assemblies is located in respective predetermined areas of the passenger compartment to enable a three-dimensional occupant shape pattern to be generated.

7. An apparatus according to claim 1, further comprising:

determining means in communication with the detecting means for determining a type of the object based on the reflected rays sensed by the detecting means; and

signal transmitting means for transmitting a signal indicative of the object type as sensed by the detecting means.

8. The system of claim 7, wherein the determining means is for determining the type of the plurality of objects based on at least one of a shape, peculiar movement and difference in distribution of each of the plurality of objects.

9. An apparatus according to claim 7, further comprising:

storage means for storing data regarding background noise when no occupant is in a vehicle; and

correction means for correcting sensing data obtained by the detecting means using the background data stored in the storing means.

10. An object position location system comprising:

a sensor unit for detecting a position of an object in three-dimensional space and generating a sensor output representative thereof,

object classification means for classifying the object in one of a predetermined number of categories based on the sensor output and for generating a classification output representative thereof; and

load control means for controlling actuation of a load based on the classification output;

wherein

the object classification means includes integrating means for integrating the sensor output,

the object classification means is for classifying the object based on the integrated sensor output,

the sensor output corresponds to a detected distance between the object and the sensor unit, and

the integrating means calculates both an integrated value of the detected distance and a movement speed of the object.

11. An object position location system comprising:

a sensor unit for detecting a position of an object in three-dimensional space and generating a sensor output representative thereof;

object classification means for classifying the object in one of a predetermined number of categories based on the sensor output and for generating a classification output representative thereof; and

load control means for controlling actuation of a load based on the classification output;

wherein the sensor unit comprises a plurality of linearly-arranged LEDs for generating infrared radiation according to a predetermined pattern, and a photodetector arranged behind the plurality of LEDs for detecting rays of the infrared radiation reflected from the object.

12. The system of claim 11, wherein the plurality of LEDs and the photodetector together form a linear sensor assembly.

13. The system of claim 12, further comprising a plurality of linear sensor assemblies located in respective predetermined areas of the passenger compartment that together enable an occupant shape pattern to be generated.

14. A passenger compartment occupant identification system, comprising:

a plurality of strategically positioned active emitter arrays for generating rays of radiation directed to a vehicle occupant position;

a plurality of detectors respectively associated with the plurality of emitter arrays for detecting reflected rays of radiation reflected from the vehicle occupant position, and for generating electric signals indicative thereof; and

a controller in communication with the plurality of detectors for processing the electric signals to obtain a three-dimensional profile of an object, if any, in the vehicle occupant position to identify the object.

15. The system of claim 14, wherein the controller identifies the object based on temporal changes in output values of the plurality of emitter arrays, and the reflected radiation sensed by the plurality of detectors.

16. The system of claim 14, wherein only one of the plurality of detectors is associated with each of the plurality of emitter arrays.

17. The system of claim 14, wherein the plurality of emitter arrays emit directional infrared radiation.

18. The system of claim 14, wherein the controller is further for distinguishing between multiple objects in the occupant position based on the reflected rays of radiation detected by the plurality of detectors.

19. The system of claim 14, wherein the controller is further for canceling passenger compartment background noise based on reflected radiation detected by the plurality of detectors during a compartment non-occupied condition.