Distance control apparatus having a distance control start/stop determination device

• US 5,938,714 A
• Filed: 12/08/1997
• Issued: 08/17/1999
• Est. Priority Date: 12/25/1996
• Status: Expired due to Term

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Satonaka, Hisashi
• Primary Examiner(s): NGUYEN, TAN QUANG
• Application Number:
  US08/986,726
• Time in Patent Office: 617 Days
• Field of Search: 701/96, 701/93, 701/300, 701/301, 701/205, 701/78, 340/902, 340/903, 340/943, 340/435, 340/436, 342/47, 342/70, 342/71, 342/458, 180/169
• US Class Current: 701/96
• CPC Class Codes: B60K 26/04 of means connecting initiating means or elements to propulsion unit
• CPC Class Codes: B60K 31/0008 including means for detecting potential obstacles in vehicle path
• CPC Class Codes: B60W 2520/105 Longitudinal acceleration
• CPC Class Codes: B60W 2710/0605 Throttle position
• CPC Class Codes: B60W 2720/106 Longitudinal acceleration
• CPC Class Codes: G08G 1/166 for active traffic, e.g. moving vehicles, pedestrians, bikes

Abstract

A distance control apparatus includes a distance detecting device which detects a distance between a vehicle and a preceding vehicle. A vehicle speed control device controls the distance between the vehicle and the preceding vehicle by adjusting a speed of the vehicle based on the detected distance, so that the vehicle is kept away from the preceding vehicle at a target distance. A distance control start/stop determination device determines one of execution and cancellation of the control of the distance by the vehicle speed control device in response to an operating condition of the vehicle.

Claims

1. A distance control apparatus for an automotive vehicle, comprising:

a distance detecting device for detecting a distance between the vehicle and a preceding vehicle;

a vehicle speed control device for controlling the distance between the vehicle and the preceding vehicle by adjusting a speed of the vehicle based on the detected distance, in order to keep the vehicle away from the preceding vehicle at a target distance; and

a distance control start/stop determination device for determining one of execution and cancellation of the control of the distance by the vehicle speed control device in response to an operating condition of the vehicle, and comprising;

an approach condition detecting device for detecting an approach condition in which the vehicle approaches the preceding vehicle; and

a target distance adjusting device for adjusting the target distance in response to the approach condition detected by the approach condition detecting device.

4. The distance control apparatus according to claim 1, wherein said vehicle speed control device comprises:

an acceleration detecting device for detecting that an acceleration of the vehicle is smaller than zero; and

a brake actuator drive device for driving a brake actuator in accordance with a brake actuation value so as to decelerate the vehicle when said acceleration detecting device has detected that the acceleration of the vehicle is smaller than zero.

5. The distance control apparatus according to claim 1, wherein said vehicle speed control device comprises:

a target speed determining device for determining a target speed of the vehicle from an acceleration of the vehicle; and

a throttle adjusting actuator drive device for driving a throttle adjusting actuator in accordance with a target throttle opening angle so as to adjust the speed of the vehicle, said target throttle opening angle being determined based on the target speed from the target speed determining device.

6. The distance control apparatus according to claim 1, wherein said approach condition detecting device makes a determination as to whether the detected distance is greater than a derived target distance and a detected relative velocity is greater than a given maximum relative velocity, said derived target distance being determined by multiplication of a detected vehicle speed and a preset time.

2. A distance control apparatus for an automotive vehicle, comprising:

a distance detecting device for detecting a distance between the vehicle and a preceding vehicle;

a vehicle speed control device for controlling the distance between the vehicle and the preceding vehicle by adjusting a speed of the vehicle based on the detected distance, in order to keep the vehicle away from the preceding vehicle at a target distance; and

a distance control start/stop determination device for determining one of execution and cancellation of the control of the distance by the vehicle speed control device in response to an operating condition of the vehicle, and comprising;

a stop condition detecting device for detecting that the control of the distance by the vehicle speed control device has been canceled, from the operating condition of the vehicle;

a braking control executing device for continuing to execute a braking control to decelerate the vehicle when said stop condition detecting device has detected that the control of the distance is stopped; and

a braking control canceling device for canceling the braking control by the braking control executing device when a manipulation of a vehicle operator is detected.

3. The distance control apparatus according to claim 2, wherein said distance detecting device comprises:

a radar unit for outputting a signal indicating the distance between the vehicle and the preceding vehicle; and

a reading device for reading the signal output from the radar unit to detect the distance based on the signal.

7. The distance control apparatus according to claim 2, wherein said stop condition detecting device makes a determination as to whether execution of the control of the distance by the vehicle speed control device has been determined at a previous cycle.

8. The distance control apparatus according to claim 2, wherein said stop condition detecting device detects whether a detected vehicle speed is lower than a given reference speed, in order to make a determination as to whether the control of the distance by the vehicle speed control device should continue to be executed.

9. The distance control apparatus according to claim 2, wherein said stop condition detecting device detects whether an acceleration of the vehicle is smaller than zero, in order to make a determination as to whether the braking control by the braking control executing device should continue to be executed.

10. The distance control apparatus according to claim 2, wherein said distance detecting device comprises:

a radar unit for outputting a signal indicating the distance between the vehicle and the preceding vehicle; and

a reading device for reading the signal output from the radar unit to detect the distance based on the signal.

11. The distance control apparatus according to claim 2, wherein said vehicle speed control device comprises:

an acceleration detecting device for detecting that an acceleration of the vehicle is smaller than zero; and

a brake actuator drive device for driving a brake actuator in accordance with a brake actuation value so as to decelerate the vehicle when said acceleration of the vehicle is smaller than zero.

12. The distance control apparatus according to claim 2, wherein said vehicle speed control device comprises:

a target speed determining device for determining a target speed of the vehicle from an acceleration of the vehicle; and

a throttle adjusting actuator drive device for driving a throttle adjusting actuator in accordance with a target throttle opening angle so as to adjust the speed of the vehicle, said target throttle opening angle being determined based on the target speed from the target speed determining device.