Apparatus and method for improving the awareness of vehicle drivers

• US 5,574,641 A
• Filed: 06/23/1995
• Issued: 11/12/1996
• 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): Zanelli, Michael
• Assistant Examiner(s): LOUIS JACQUES, JACQUES H
• Application Number:
  US08/494,306
• Time in Patent Office: 508 Days
• Field of Search: 364/424.05, 364/424.01, 364/733, 364/461, 364/462, 340/575, 340/576, 340/903, 340/435, 340/443, 340/438, 340/446, 340/440, 340/457, 180/272, 180/271, 180/280, 128/706, 128/700, 128/691, 128/639, 128/745, 128/780, 128/782, 128/733, 128/707, 128/696, 342/71, 342/72, 342/128, 324/76.59, 324/76.63, 200/61.47, 200/61.52
• US Class Current: 701/1
• CPC Class Codes: A61B 5/18 for vehicle drivers or machine operators
• CPC Class Codes: G08B 21/06 indicating a condition of sleep, e.g. anti-dozing alarms

Abstract

An apparatus and method for detecting heartbeat pulse information of a driver, including determining a level of awareness of the driver from the heartbeat pulse information, detecting a steering angle of the vehicle, determines the level of awareness, of the driver from the steering angle and activating at least one warning according to the level of awareness of the driver.

Claims

1. An apparatus comprising:

heartbeat sensor means for detecting heartbeat pulse information of a driver;

heartbeat awareness determination means for determining a first decrease in awareness of said driver from said heartbeat pulse information detected by said heartbeat sensor;

steering angle sensor means for detecting a steering angle of a vehicle and producing a detection signal;

steering awareness determination means for determining a second decrease in awareness of said driver according to a high-frequency component of said detection signal from said steering angle sensor means;

a plurality of warning means, each for stimulating different senses of said driver for improving a level of awareness of said driver; and

warning control means for activating said plurality of warning means in stages according to said first and said second decreases in awareness of said driver determined by said heartbeat awareness determination means and said steering awareness determination means.

2. The apparatus of claim 1, further comprising:

heartbeat processing means for determining a heartbeat rate from said heartbeat pulse information;

heartbeat reference processing means for determining a reference heartbeat rate of said driver from said heartbeat rate;

said awareness determination means comparing said reference heartbeat rate set with said heartbeat rate to determine said first decrease in awareness of said driver; and

steering angle data processing means for determining a steering component parameter from said steering angle;

said steering awareness determination means comparing said steering component parameter with a preset reference parameter to determine said second decrease in awareness of said driver.

3. The apparatus of claim 2, wherein said steering angle data processing means determines a frequency distribution of said steering angle and extracts a predetermined frequency band to determine a steering characteristic parameter of said driver.

4. The apparatus of claim 2, wherein said warning control means includes a steering wheel grip defect warning processing unit for determining whether said driver is gripping a steering wheel correctly, from said heartbeat rate.

5. The apparatus of claim 4, further comprising:

a warning release switch for terminating activation of at least one of said plurality of warning means; and

wherein said steering wheel grip defect warning processing unit activates said at least one of said plurality of warning means according to a steering wheel grip defect, and said warning continues to be active even if a warning release switch is set.

6. The apparatus of claim 1, wherein said plurality of warning means includes:

tactile warning means for improving said level of awareness of said driver by a tactile excitation,

visual warning means for improving said level of awareness of said driver by a visual excitation, and

auditory warning means for improving said level of awareness of said driver by an auditory excitation.

7. The apparatus of claim 6, wherein said warning control means operates said tactile warning means when at least one of said first and said second decreases in awareness of said driver is in a first range, said visual warning means when at least one of said first and said second decreases in awareness of said driver is in a second level range lower than said first range, and said auditory warning means when at least one of said first and said second decreases in awareness of said driver is in a third range lower than said second range.

8. The apparatus of claim 6, wherein said tactile warning means moves side supports of a seat back, said visual warning means displays a transmission display on a front window, and said auditory warning means sounds a buzzer incorporated in an instrument panel.

9. The apparatus of claim 1, further comprising:

a warning release switch for terminating activation of said at least one of said plurality of warning means.

10. An apparatus comprising:

awareness determination means for determining a decrease in a level of awareness of a driver;

a plurality of warning means, each stimulating different senses of said driver for improving said level of awareness of said driver, said plurality of warning means includes tactile warning means for deforming a portion of a seat;

warning control means for activating said plurality of warning means in stages according to said decrease in said level of awareness of said driver determined by said awareness determination means, and wherein

said warning control means operates said tactile warning means when said decrease in said level of awareness of said driver is in a first range, and operates said at least one of said warning means other than said tactile warning means when said decrease in said level of awareness of said driver is in a second range larger than said first range.

11. The apparatus of claim 10, wherein said plurality of warning means further includes visual warning means for improving said level of awareness of said driver by a visual excitation, and auditory warning means for improving said level of awareness of said driver by an auditory excitation, said warning control means controls said tactile warning means when said level of awareness of said driver is in a first range, said visual warning means when said level of awareness of said driver is in a second range lower than said first range, and said auditory warning means when said level of awareness of said driver is in a third range lower than said second range.

12. The apparatus of claim 10, wherein said portion of said seat is a side support.

13. A method comprising the steps of:

determining a first decrease in awareness of a driver from heartbeat pulse information;

determining a second decrease in awareness of said driver according to a high frequency component of a steering angle detection signal;

activating a plurality of warning devices in stages, each stimulating different senses for improving a level of awareness of said driver, according to said first and said second decrease in awareness of said driver determined from said heartbeat pulse information and said high frequency component of said steering angle detection signal.

14. A method for controlling a vehicle including a plurality of warning devices for stimulating different senses of a driver for improving a level of awareness of said driver, comprising the steps of:

(a) determining a level of decrease in awareness of said driver; and

(b) activating said plurality of warning devices in stages, said plurality of warning devices include a tactile warning device for deforming a portion of a seat, wherein said step (b) includes the substeps of

activating said tactile warning device when said level of decrease in awareness is in a first range, and

activating said at least one of said plurality of warning devices other than said tactile warning device when said level of decrease in awareness is in a second range larger than said first range.

15. An apparatus comprising:

heartbeat processing means for determining a first decrease in awareness of a driver from heartbeat information;

steering processing means for determining a second decrease in awareness of said driver from a high frequency component of a steering operation; and

warning means for activating a plurality of warning devices in stages, each stimulating different senses of said driver based on said first and said second decreases in awareness of said driver.

16. A method of comprising the steps of:

(a) determining a first decrease in awareness of a driver from heartbeat information;

(b) determining a second decrease in awareness of said driver from a high frequency component of a steering detection signal;

(c) activating a plurality of warning devices in stages each stimulating different senses of said driver based on said first and said second decrease in awareness of said driver.

17. An apparatus comprising:

at least two warning means, including a tactile warning device for deforming a portion of a seat, for increasing a level of awareness of a vehicle driver;

awareness determining means for determining a decrease in said level of awareness of said vehicle driver; and

control means for activating said tactile warning device as a first stage when said decrease in said level of awareness is at a first range, and then activating at least one of said at least two warning means other than said tactile warning device as a second stage when said level of decrease in awareness is in a second range larger than said first range to increase actual awareness of said driver.

18. A method comprising the steps of:

(a) determining a decrease in awareness of a vehicle driver; and

(b) activating one of at least two warning devices including a tactile warning device for deforming a portion of a seat, wherein said step (b) includes the substeps of

activating said tactile warning device as a first stage when said level of decrease in awareness is in a first range, and

activating said at least one of said plurality of warning devices other than said tactile warning device as a second stage when said level of decrease in awareness is in a second range larger than said first range to increase actual awareness of said driver.