Methods for controlling a system in a vehicle using a transmitting/receiving transducer and/or while compensating for thermal gradients

• US 20030168838A1
• Filed: 01/13/2003
• Published: 09/11/2003
• Est. Priority Date: 06/09/1998
• Status: Active Grant

• Current Assignee: American Vehicular Sciences LLC (Acacia Research Corporation)
• Original Assignee: Automotive Technologies International Incorporated
• Inventors: Breed, David S., Johnson, Wendell C., DuVall, Wilbur E.
• Granted Patent: US 6,856,876 B2
• Time in Patent Office: Days
• US Class Current: 280/735
• CPC Class Codes: B60R 21/01526 using piezoelectric elements
• CPC Class Codes: B60R 21/01536 using ultrasonic waves

Abstract

Methods for controlling a vehicle system in which waves are directed from a transducer into the passenger compartment and is reflected off or modified by an object in the passenger compartment and received by the same or a different transducer. One or more techniques are used to compensate for thermal gradients in the passenger compartment and/or enable the use of a single transducer to send and receive waves, for example, a tubular mounting structure for the transducers, electronic reduction of ringing of the transducer, mechanical damping of the transducer cone, shaped horns, grills and reflectors for the output of the transducers to precisely control the beam pattern, a logarithmic compression amplifier, a temperature compensation method based on change in transducer properties with temperature and/or a dual level network, one level for categorization and the second for occupant position sensing.

Claims

1. A method for generating a neural network for determining the position of an object in a vehicle, comprising the steps of:

conducting a plurality of data generation steps, each of said data generating steps comprising the steps of placing an object in the passenger compartment of the vehicle,

directing waves into at least a portion of the passenger compartment in which the object is situated,

receiving reflected waves from the object at a receiver,

forming a data set of a signal representative of the reflected waves from the object, the distance from the object to the receiver and the temperature of the passenger compartment between the object and the receiver,

changing the temperature of the air between the object and the receiver, and

performing the wave-directing step, wave-receiving step and data set forming step for the object at different temperatures between the object and the receiver; and

generating a pattern recognition algorithm from the data sets such that upon operational input of a signal representative of reflected waves from the object, the algorithm provides an approximation of the distance from the object to the receiver.

2. The method of claim 1, wherein the algorithm is a neural network.

3. The method of claim 1, wherein the step of conducting a plurality of data generation steps further comprises the step of placing different objects in the passenger compartment and then performing the wave-directing step, the wave-receiving step and temperature changing step for different objects, the identity of the object being included in the data set such that upon operational input of a signal representative of reflected waves from the object, the algorithm provides an approximation of the identity of the object.

4. The method of claim 3, wherein the step of conducting a plurality of data generation steps further comprises the step of placing the different objects in different positions in the passenger compartment and then performing the wave-directing step, the wave-receiving step and temperature changing step for the different objects in the different positions, the identity and position of the object being included in the data set such that upon operational input of a signal representative of reflected waves from the object, the algorithm provides an approximation of the identity and position of the object.

5. The method of claim 1, wherein the step of conducting a plurality of data generation steps further comprises the step of placing the object in different positions in the passenger compartment and then performing the wave-directing step, the wave-receiving step and temperature changing step for the object in the different positions, the position of the object being included in the data set such that upon operational input of a signal representative of reflected waves from the object, the algorithm provides an approximation of the position of the object.

6. The method of claim 1, wherein the step of changing the temperature of the air comprises the step of dynamically changed the temperature of the air by introducing a flow of blowing air at a different temperature than the ambient temperature of the passenger compartment.

7. The method of claim 6, further comprising the step of

creating the blowing air flow by operating a vehicle heater or air conditioner of the vehicle.

8. The method of claim 1, wherein the step of changing the temperature of the air comprises the step of changing the temperature of the air by creating a temperature gradient between a top and a bottom of the passenger compartment.

9. The method of claim 1, wherein the waves are ultrasonic waves.

10. The method of claim 1, wherein the waves are electromagnetic waves.

11. A method for identifying an object in a passenger compartment of a vehicle, comprising the steps of:

mounting a plurality of wave-emitting and receiving transducers on the vehicle, each transducer being arranged to transmit and receive waves at a different frequency,

controlling the transducers to simultaneously transmit waves at the different frequencies into the passenger compartment, and

identifying the object based on the waves received by at least some of the transducers after being modified by passing through the passenger compartment.

12. The method of claim 11, further comprising the step of

determining the spacing between the frequencies of the waves transmitted and received by the transducers to reduce the possibility of each transducer receiving waves transmitted by another transducer.

13. The method of claim 11, further comprising the step of

determining the position of the object based on the waves received by at least some of the transducers after being modified by passing through the passenger compartment.

14. The method of claim 11, wherein the transducers are ultrasonic transducers.

15. The method of claim 14, further comprising the step of:

electronically reducing motion of a respective vibrating element of at least one of the transducers to reduce ringing of the transducer.

16. The method of claim 14, further comprising the step of

mounting at least one of the transducers in a respective tube having an opening through which the waves are transmitted and received.

17. The method of claim 11, wherein the transducers are electromagnetic transducers.

18. The method of claim 11, wherein the transducers of different frequency transmit and receive substantially simultaneously.

19. In combination, a vehicle and an arrangement for identifying an object in a passenger compartment of the vehicle, the arrangement comprising:

a plurality of wave-emitting and receiving transducers mounted on the vehicle, each transducer being arranged to transmit and receive waves at a different frequency, and

a processor coupled to said transducers for controlling said transducers to simultaneously transmit waves at the different frequencies into the passenger compartment and receiving signals representative of the waves received by said transducers after being modified by passing through the passenger compartment, said processor being arranged to identify the object based on the signals representative of the waves received by at least some of said transducers.

20. The arrangement of claim 19, wherein said processor is arranged to determine the position of the object based on the signals representative of the waves received by at least some of the transducers.

21. The arrangement of claim 19, wherein said transducers are ultrasonic transducers.

22. The arrangement of claim 21, wherein at least one of said transducers is arranged in a tube having an opening through which the waves are transmitted and received.

23. The arrangement of claim 19, wherein said transducers are electromagnetic transducers.

24. A method for determining the position of an object in a passenger compartment of a vehicle, comprising the steps of:

mounting a plurality of wave-emitting and receiving transducers on the vehicle, each transducer being arranged to transmit and receive waves at a different frequency,

controlling the transducers to simultaneously transmit waves at the different frequencies into the passenger compartment, and

determining the position of the object based on the waves received by the transducers after being modified by passing through the passenger compartment.

25. The method of claim 24, further comprising the step of

determining the spacing between the frequencies of the waves transmitted and received by the transducers to reduce the possibility of each transducer receiving waves transmitted by another transducer.

26. The method of claim 24, further comprising the step of

identifying the object based on the waves received by at least some of the transducers after being modified by passing through the passenger compartment.

27. The method of claim 24, wherein the transducers are ultrasonic transducers.

28. The method of claim 27, further comprising the step of:

electronically reducing motion of a respective vibrating element of at least one of the transducers to reduce ringing of the transducer.

29. The method of claim 27, further comprising the step of

mounting at least one of the transducers in a respective tube having an opening through which the waves are transmitted and received.

30. The method of claim 24, wherein the transducers are electromagnetic transducers.

31. In combination, a vehicle and an arrangement for determining the position of an object in a passenger compartment of the vehicle, the arrangement comprising:

a plurality of wave-emitting and receiving transducers mounted on the vehicle, each transducer being arranged to transmit and receive waves at a different frequency, and

a processor coupled to said transducers for controlling said transducers to simultaneously transmit waves at the different frequencies into the passenger compartment and receiving signals representative of the waves received by said transducers after being modified by passing through the passenger compartment, said processor being arranged to determine the position of the object based on the signals representative of the waves received by at least some of the transducers.

32. The arrangement of claim 31, wherein said processor is arranged to identify the object based on the signals representative of the waves received by at least some of said transducers.

33. The arrangement of claim 31, wherein said transducers are ultrasonic transducers.

34. The arrangement of claim 31, wherein said transducers are electromagnetic transducers.

35. A method for controlling deployment of an occupant restraint device based on the position of an object in a passenger compartment of a vehicle, comprising the steps of:

mounting a plurality of wave-emitting and receiving transducers on the vehicle, each transducer being arranged to transmit and receive waves at a different frequency,

controlling the transducers to simultaneously transmit waves at the different frequencies into the passenger compartment,

determining whether the object is of a type requiring deployment of the occupant restraint device in the event of a crash involving the vehicle based on the waves received by at least some of the transducers after being modified by passing through the passenger compartment, and if so,

determining whether the position of the object relative to the occupant restraint device would cause injury to the object upon deployment of the occupant restraint device based on the waves received by at least some of the transducers.

36. The method of claim 35, further comprising the step of

identifying the object based on the waves received by at least some of the transducers after being modified by passing through the passenger compartment.

37. The method of claim 35, wherein the transducers are ultrasonic transducers.

38. The method of claim 37, further comprising the step of:

electronically reducing motion of a respective vibrating element of at least one of the transducers to reduce ringing of the transducer.

39. The method of claim 37, further comprising the step of

mounting at least one of the transducers in a respective tube having an opening through which the waves are transmitted and received.

40. The method of claim 35, wherein the step of determining whether the object is of a type requiring deployment of the occupant restraint device comprises the step of training a first neural network on signals from at least some of the transducers representative of waves received by the transducers when different objects are situated in the passenger compartment.

41. The method of claim 40, wherein the step of determining whether the position of the object relative to the occupant restraint device would cause injury to the object upon deployment of the occupant restraint device comprises the step of training a second neural network on signals from at least some of the transducers when different objects in different positions are situated in the passenger compartment.

42. The method of claim 35, wherein the transducers are electromagnetic transducers.

43. A method for categorizing and determining the position of an object in a passenger compartment of a vehicle, comprising the steps of:

mounting a plurality of wave-receiving transducers on the vehicle,

training a first neural network on signals from at least some of the transducers representative of waves received by the transducers when different objects in different positions are situated in the passenger compartment such that the first neural network provides an output signal indicative of the categorization of the object, and

training a second neural network on signals from at least some of said transducers representative of waves received by the transducers when different objects in different positions are situated in the passenger compartment such that the second neural network provides an output signal indicative of the position of the object.

44. The method of claim 43, further comprising the step of

controlling the transducers to transmit and receive waves each at a different frequency.

45. The method of claim 43, further comprising the step of

mounting at least one of the transducers in a respective tube having an opening through which the waves are transmitted and received.