Apparatus and method for improving the awareness of vehicle drivers

• US 5,488,353 A
• Filed: 01/04/1994
• Issued: 01/30/1996
• Est. Priority Date: 01/06/1993
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
• Original Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
• Inventors: Isomura, Arihiro, Kawakami, Yoshinaka, Hamatani, Katsunori, Kamiya, Kouichi, Takigawa, Yoshiharu
• Primary Examiner(s): Swarthout, Brent A.
• Assistant Examiner(s): Lee, Benjamin C.
• Application Number:
  US08/177,863
• Time in Patent Office: 756 Days
• Field of Search: 340/575, 340/576, 340/439, 128/691, 128/706, 128/639, 180/271, 180/272
• US Class Current: 340/576
• CPC Class Codes: A61B 5/18 for vehicle drivers or machine operators
• CPC Class Codes: B60W 2540/18 Steering angle
• CPC Class Codes: G08B 21/06 indicating a condition of sleep, e.g. anti-dozing alarms

Abstract

An apparatus and method for a driver of a vehicle in which a level of awareness of the driver is determined, and compared with a reference value to determine a decrease in awareness. A warning is generated when driver awareness is low. The driver responds by terminating the warning. The reference value of the awareness determination means is corrected according to a response time of the driver to the warning.

Claims

1. An apparatus comprising:

awareness determination means for determining a level of awareness of a vehicle driver and comparing the level of awareness with a reference value to determine a decrease in awareness,

at least one warning means for generating a warning to the vehicle driver when the decrease in awareness is detected,

warning termination means for terminating the warning upon operation by the vehicle driver, and

reference value correction means for measuring a response time from the generation to the termination of said warning and for correcting the reference value of said awareness determination means according to said response time for subsequent comparison and warning generation.

2. An apparatus of claim 1, wherein said at least one warning means includes a plurality of warning means,

said apparatus further comprising warning control means for selecting one of said plurality of warning means according to the level of awareness determined to generate said warning for a reference value actuation time, and

warning actuation time correcting means for correcting said reference value actuation time of the selected one of said plurality of warning means according to the response time to the warning from the vehicle driver.

3. The apparatus of claim 2, wherein said warning actuation time correction means determines the level of awareness of the driver to be high when the response time is shorter than a predetermined value and corrects the reference warning actuation time such that the selected one of said plurality of warning means is delayed.

4. The apparatus of claim 2, wherein said warning actuation time correction means determines the level of awareness of the driver to be low when the response time is longer than a predetermined value and corrects the reference value of said awareness determination means such that the warning from said at least one warning signal means is generated earlier than when said response time is shorter or equal to said predetermined value.

5. The apparatus of claim 2, wherein said plurality of warning means includes,

tactile warning means for increasing the level of awareness by tactile excitation when the level of awareness is in a first range,

visual warning means for increasing the level of awareness by visual excitation when the level of awareness is in a second range lower than the first range, and

auditory warning means for increasing the level of awareness by auditory excitation when the level of awareness is in a third range, lower than the second range.

6. The apparatus of claim 1, wherein said reference value correction mean further determines the level of awareness of the vehicle driver to be high when the response time is shorter than a predetermined value and corrects the reference value of said awareness determination means such that the warning from said at least one warning means is delayed.

7. The apparatus of claim 1, wherein said reference value correction means further determines the level of awareness of the vehicle driver to be low when the response time is longer than a predetermined value and corrects the reference value of said awareness determination means such that the warning from said at least one warning signal means is generated earlier than when said response time is shorter or equal to said predetermined value.

8. The apparatus of claim 1, wherein said awareness determination means determines the level of awareness from a heartbeat rate of the vehicle driver and a steering characteristic parameter of a steering wheel of a vehicle,

said reference value correction means further correcting a reference heartbeat rate when the level of awareness is determined from the heartbeat rate and correcting a reference steering characteristic value when the level of awareness is determined from the steering characteristic parameter.

9. An apparatus comprising:

heartbeat rate detection means for detecting a heart rate of a driver of a vehicle,

heartbeat awareness determination means for comparing the heartbeat rate determined by said heartbeat rate detecting means with a reference value to determine a decrease in awareness of the driver,

warning means warning the driver,

warning control means for controlling said warning means for generation of said warning according to the comparison by said heartbeat awareness determination means,

warning termination means for terminating the warning upon operation by the vehicle driver, and

reference value correction means for measuring a response time from the generation to the termination of said warning and for correcting the reference value of said heartbeat awareness determination means according to said response time for subsequent comparison and warning generation.

10. An apparatus comprising:

a steering angle sensor for detecting a steering angle of a vehicle and generating steering angle data,

steering angle data processing means for calculating a frequency distribution of the steering angle data and extracting a predetermined frequency area to determine a steering characteristic parameter of the driver,

steering awareness determination means for comparing the steering characteristic parameter with a reference value to determine a decrease in awareness of the driver,

warning means warning the driver,

warning control means for controlling said warning means for generation of said warning according to the comparison by said steering awareness determination means,

warning termination means for terminating the warning upon operation by the vehicle driver, and

reference value correction means for measuring a response time from the generation to the termination of said warning and for correcting the reference value of said steering awareness determination means according to said response time for subsequent comparison and warning generation.

11. A method comprising:

determining a level of awareness of a driver of a vehicle and comparing the level of awareness determined with a reference value to determine a decrease in awareness;

outputting a warning to the driver upon said determined decrease in awareness;

terminating the warning upon receipt of an operated response from the driver; and

measuring a response time from the output to the termination of said warning; and

correcting the reference value according to said response time to the warning from the driver for subsequent comparing and warning output.

12. An apparatus comprising:

determining means for determining a level of awareness of a driver of a vehicle and comparing the level of awareness determined with a reference value;

warning means for outputting a warning to the driver upon said determined awareness level falling below said reference value;

termination means for terminating the warning by a response operation from said driver; and

correcting means for measuring a response time from the output to the termination of said warning and for correcting the reference value according to said response time to the warning from the driver for subsequent comparing and warning generation.