Method and system for maintaining operator alertness

• US 7,652,583 B2
• Filed: 03/20/2007
• Issued: 01/26/2010
• Est. Priority Date: 03/20/2007
• Status: Active Grant

• Current Assignee: Deere & Company
• Original Assignee: Deere & Company
• Inventors: Duncan, Jerry Richard, Sanchez, Julian
• Primary Examiner(s): TWEEL JR, JOHN ALEXANDER
• Application Number:
  US11/688,375
• Publication Number:
  US 20080231461A1
• Time in Patent Office: 1,043 Days
• Field of Search: 340/575, 340/576, 340/439, 180/272
• US Class Current: 340/575
• CPC Class Codes: B60K 28/066 actuating a signalling device B60K28/063 takes precedence
• CPC Class Codes: G08B 21/06 indicating a condition of sleep, e.g. anti-dozing alarms

Abstract

A method and system for maintaining operator alertness comprises a detector for detecting a physical status of an operator. The physical status indicates a first level of operator alertness. A user interface requests a second level of operator alertness from a self-evaluation of the operator at a request time. An evaluator measures at least one of an accuracy of the operator response to the requested input and a response time of the operator from the request time. An alert module generates alarm data or an alarm signal to alert the operator based on the first level of operator alertness indicating an inattentive state and at least one of the measured accuracy and operator response time indicating the inattentive state.

Claims

1. A method for maintaining operator alertness, the method comprising:

detecting a physical status of an operator, the physical status indicating a first level of operator alertness;

requesting an input of an operator at a request time, the input indicating a second level of operator alertness at the request time;

measuring an accuracy of the operator response to the requested input and a response time of the operator from the request time;

generating at least one of alarm data or an alarm signal to alert an operator based on the first level of operator alertness indicating an inattentive state and the measured accuracy and response time of the operator indicating the inattentive state; and

responsive to determining decreased attentiveness of the operator, increasing a request frequency for the input of the second level of operator alertness, wherein the second level of operator alertness is from a self-evaluation of the operator.

2. The method according to claim 1 wherein the detecting the physical status of an operator comprises monitoring an eye status or blink rate of the operator.

3. The method according to claim 1 wherein the detecting the physical status of an operator comprises monitoring a tilt of the head of the operator to determine if the head exceeds a critical angle with respect to a reference angle.

4. The method according to claim 1 wherein the requesting comprises asking the operator to answer at least one of a mathematical question or a trivia question.

5. The method according to claim 1 wherein the requesting comprises asking the operator to place a finger of the operator on a target area of a touch screen display.

6. The method according to claim 1 wherein the generating comprises generating the alarm data or the alarm signal based on the first level of operator alertness from the physical status of the operator, the second level of operator alertness from the self-evaluation of the operator, and the measured accuracy and response time of the operator indicating the inattentive state.

7. The method according to claim 1 further comprising:

determining whether the first level of operator alertness is consistent with the second level of operator alertness; and

responsive to determining that the first level of operator alertness is inconsistent with the second level of operator alertness, increasing the request frequency for the input of the second level of operator alertness.

8. The method according to claim 1 wherein the generating comprises increasing an intensity of the alarm commensurate with an aggregate decrease in the first level of operator alertness and the second level of operator alertness.

9. The method according to claim 1 wherein the detecting the physical status of an operator comprises monitoring an eye status of the operator and assigning a first level of alertness or inattentiveness associated with the eye status if the eye status indicates the operator is inattentive.

10. The method according to claim 1 wherein the detecting the physical status of an operator comprises monitoring an orientation or movement of the head of the operator and assigning a first level of alertness or inattentiveness associated with the orientation or movement if it indicates the operator is inattentive.

22. The method according to claim 1 wherein the alarm data is transmitted to an autonomous navigation system, an automatic steering system, a global positioning system, and a controller for controlling steering of a vehicle to compensate for the inattentive state of the operator.

11. A system for maintaining operator alertness, the system comprising:

a detector for detecting a physical status of an operator, the physical status indicating a first level of operator alertness;

a user interface for requesting an input of the operator at a request time, wherein the user interface is arranged to accept the input indicating a second level of operator alertness at the request time;

an evaluator for measuring an accuracy of the operator response to the requested input and a response time of the operator from the request time;

an alert module for generating at least one of alarm data or an alarm signal to alert the operator based on the first level of operator alertness indicating an inattentive state and the measured accuracy and response time of the operator indicating the inattentive state; and

the alert module for increasing a request frequency for the input of the second level of operator alertness in response to determining decreased attentiveness of the operator, wherein the second level of operator alertness is from a self-evaluation of the operator.

12. The system according to claim 11 wherein the detector comprises an eye monitoring device for monitoring an eye status or blink rate of the operator.

13. The system according to claim 11 wherein the detector comprises an imaging system for monitoring a tilt of the head of the operator to determine if the head exceeds a critical angle with respect to a reference angle.

14. The system according to claim 11 wherein the user interface is arranged to ask the operator to answer at least one of a mathematical question or a trivia question.

15. The system according to claim 11 wherein the user interface is arranged to ask the operator to place the operator'"'"'s finger on a target area of a touch screen display.

16. The system according to claim 11 further comprising:

a data processor for determining whether the first level of operator alertness is consistent with the second level of operator alertness; and

the alert module increasing the request frequency for the input of the second level of operator alertness in response to determining that the first level of operator alertness is inconsistent with the second level of operator alertness.

17. The system according to claim 11 wherein the alert module is arranged to increase an intensity of the alarm commensurate with an aggregate decrease in the first level of operator alertness and the second level of operator alertness.

23. The system according to claim 11 wherein the alarm data is transmitted to an autonomous navigation system, an automatic steering system, a global positioning system, and a controller for controlling steering of a vehicle to compensate for the inattentive state of the operator.

18. A method for maintaining operator alertness, the method comprising:

detecting a physical status of an operator, the physical status indicating a first level of operator alertness;

assigning a first weighting factor for the first level of operator alertness;

requesting an input of an operator at a request time, the input indicating a second level of operator alertness at the request time;

assigning a second weighting factor for the second level of operator alertness;

assigning a third level of operator alertness based on a measurement of an accuracy of the operator response to the requested input and a response time of the operator from the request time;

assigning a third weighting factor for the third level of operator alertness;

determining a composite operator alertness score based on the first level of operator alertness, the second level of operator alertness, the third level of operator alertness, and their respective weighting factors; and

responsive to determining decreased attentiveness of the operator, increasing a request frequency for the input of the second level of operator alertness, wherein the second level of operator alertness is from a self-evaluation of the operator.

19. The method according to claim 18 further comprising:

generating at least one of alarm data or an alarm signal to alert an operator based on the composite operator alertness score.

20. The method according to claim 18 further comprising:

adjusting a respective intensity or frequency of an alert device based on a corresponding composite operator alertness score.

21. The method according to claim 18 wherein the composite operator alertness score is determined in accordance with the following equation:

S=AX+BY +CZ, where S is the composite operator alertness score, A is the first weighting factor, X is a first numerical rating associated with the first level of operator alertness, B is the second weighting factor, Y is a second numerical rating associated with the second level of operator alertness, C is the third weighting factor, and Z is a third numerical rating associated with the third level of operator alertness.

24. The method according to claim 19 wherein the alarm data is transmitted to an autonomous navigation system, an automatic steering system, a global positioning system, and a controller for controlling steering of a vehicle to compensate for an inattentive state of the operator.