Vehicle control system

• US 8,321,117 B2
• Filed: 09/10/2010
• Issued: 11/27/2012
• Est. Priority Date: 09/17/2009
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: Oosawa, Toshiya, Sonoda, Hiroki
• Primary Examiner(s): Camby, Richard M.
• Application Number:
  US12/879,217
• Publication Number:
  US 20110066350A1
• Time in Patent Office: 809 Days
• Field of Search: 701/70, 701/93, 701/96, 701/83, 701/300, 701/301, 180/178, 180/179
• US Class Current: 701/96
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 30/16 Control of distance between vehicles, e.g. keeping a distance to preceding vehicle

Abstract

A vehicle control system includes: an inter-vehicle distance control section configured to perform a follow-up control to a preceding vehicle by automatically accelerating or decelerating a host vehicle, or a constant speed running control section configured to perform a constant speed running to converge to a set speed; a brake operating state sensing device; and a control unit including; a deceleration control section configured to perform a deceleration in accordance with the brake operating state of the driver when the brake operating state sensing device senses the brake operation of the driver during the inter-vehicle distance control or the constant speed running control; and an acceleration control limit section configured to cancel a control in the acceleration direction which is performed by the inter-vehicle distance control or the constant speed control when the brake operating state sensing device senses an end of the brake operation of the driver.

Claims

1. A vehicle control system comprising:

an inter-vehicle distance control section configured to perform a follow-up control to a preceding vehicle by automatically accelerating or decelerating a host vehicle, or a constant speed running control section configured to perform a constant speed running to converge to a set speed;

a brake operating state sensing device arranged to sense a brake operating state of a driver; and

a control unit including;

a deceleration control section configured to perform a deceleration in accordance with the brake operating state of the driver when the brake operating state sensing device senses the brake operation of the driver during the inter-vehicle distance control or the constant speed running control; and

an acceleration control limit section configured to cancel a control in the acceleration direction which is performed by the inter-vehicle distance control or the constant speed control when the brake operating state sensing device senses an end of the brake operation of the driver.

2. The vehicle control system as claimed in claim 1, wherein the vehicle control system further comprises an accelerator operating state sensing device arranged to sense an accelerator operating state of the driver;

and the control unit is configured to perform the inter-vehicle distance control or the constant speed running control when the accelerator operating state sensing device senses a decreasing direction of an accelerator operating amount.

3. The vehicle control system as claimed in claim 2, wherein the vehicle control system further comprises an inter-vehicle distance control start switch configured to hold a state in which the inter-vehicle distance control is performed, and a preceding vehicle sensing device arranged to sense the preceding vehicle;

and the control unit is configured to perform the constant speed running control when the vehicle speed is equal to or greater than a predetermined speed when the preceding vehicle sensing device does not sense the preceding vehicle during the inter-vehicle distance control, and the accelerator operating state sensing device senses the decreasing direction of the accelerator operation amount, and to perform a coast running when the vehicle speed is smaller than the predetermined speed, when the preceding vehicle sensing device does not sense the preceding vehicle during the inter-vehicle distance control, and the accelerator operating state sensing device senses the decreasing direction of the accelerator operation amount.

4. The vehicle control system as claimed in claim 2, wherein the vehicle control system further comprises an inter-vehicle distance control switch arranged to hold a state in which the inter-vehicle distance control is performed, and a preceding vehicle sensing device arranged to sense the preceding vehicle;

the accelerator operating state sensing device is configured to sense a return speed of the accelerator operation; and

the control unit is configured to perform the deceleration control when the sensed accelerator return speed is equal to or greater than a predetermined return speed during the constant speed running control.

5. The vehicle control system as claimed in claim 2, wherein the control unit is configured to perform the inter-vehicle distance control by setting, to a set inter-vehicle distance, an inter-vehicle distance when the accelerator operating state sensing device senses the decreasing direction of the accelerator operating amount, and a speed of the host vehicle becomes substantially equal to a speed of the preceding vehicle.

6. The vehicle control system as claimed in claim 1, wherein the vehicle control system further comprises a preceding vehicle sensing device arranged to sense the preceding vehicle;

and the control unit is configured to operate the acceleration limit control section when the preceding vehicle sensing device senses the preceding vehicle, and to stop the inter-vehicle distance control and the constant speed running control and to perform the coast running when the preceding vehicle sensing device does not sense the preceding vehicle.

7. The vehicle control system as claimed in claim 6, wherein the coast running has a deceleration degree substantially identical to a deceleration degree of an engine braking of the host vehicle.

8. A vehicle control system comprising:

a preceding vehicle sensing device arranged to sense a preceding vehicle;

an inter-vehicle distance control section configured to perform a follow-up control to the preceding vehicle by automatically accelerating or decelerating a host vehicle;

a brake operating state sensing device arranged to sense a brake operating state of a driver; and

a control unit configured

to perform a deceleration control in accordance with the brake operation state of the driver when the brake operating state sensing device senses the brake operation of the driver during the inter-vehicle distance control,

to perform a coast running when the brake operating state sensing device senses an end of the brake operation, and the preceding vehicle sensing device does not sense the preceding vehicle, and

to perform an acceleration limit inter-vehicle distance control to cancel a control in the acceleration direction which is performed by the inter-vehicle distance control when the brake operating state sensing device senses the end of the brake operation, and the preceding vehicle sensing device senses the preceding vehicle.

9. The vehicle control system as claimed in claim 8, wherein the coast running has a deceleration degree substantially identical to a deceleration degree of an engine braking of the host vehicle.

10. The vehicle control system as claimed in claim 8, wherein the vehicle control system further comprises an accelerator operating state sensing device arranged to sense an accelerator operating state of the driver;

and the control unit is configured to perform the inter-vehicle distance control when the accelerator operating state sensing device senses a decreasing direction of an accelerator operating amount.

11. The vehicle control system as claimed in claim 10, wherein the vehicle control system further comprises an inter-vehicle distance control start switch configured to hold a state in which the inter-vehicle distance control is performed, and a constant speed running control section configured to perform a constant speed running to converge to a set speed;

and the control unit is configured to perform the constant speed running control when the vehicle speed is equal to or greater than a predetermined speed, when the preceding vehicle sensing device does not sense the preceding vehicle during the inter-vehicle distance control, and the accelerator operating state sensing device senses the decreasing direction of the accelerator operation amount, and to perform the deceleration control when the vehicle speed is smaller than the predetermined speed, when the preceding vehicle sensing device does not sense the preceding vehicle during the inter-vehicle distance control, and the accelerator operating state sensing device senses the decreasing direction of the accelerator operation amount.

12. The vehicle control system as claimed in claim 10, wherein the vehicle control system further comprises an inter-vehicle distance control start switch arranged to hold a state in which the inter-vehicle distance control is performed, and a preceding vehicle sensing device arranged to sense the preceding vehicle;

the accelerator operating state sensing device is configured to sense a return speed of the accelerator operation; and

the control unit is configured to perform the deceleration control when the sensed accelerator return speed is equal to or greater than a predetermined return speed during the constant speed running.

13. The vehicle control system as claimed in claim 10, wherein the control unit is configured to perform the inter-vehicle distance control by setting, to a set inter-vehicle distance, an inter-vehicle distance when the accelerator operating state sensing device senses the decreasing direction of the accelerator operating amount, and a speed of the host vehicle becomes substantially equal to a speed of the preceding vehicle.

14. A vehicle control system comprising:

an accelerator operating state sensing device arranged to sense an accelerator operating state of a driver;

a brake operating state sensing device arranged to sense a brake operating state of the driver;

an inter-vehicle distance control section configured to perform an inter-vehicle distance control to start a follow-up control to hold a predetermined inter-vehicle distance between a host vehicle and a preceding vehicle when the accelerator operating state sensing section senses a decreasing direction of an accelerator operating amount;

a deceleration section configured to perform a deceleration control in accordance with the brake operating state of the driver when the brake operating state sensing device senses the brake operation; and

an acceleration control limit section configured to cancel a control in the acceleration direction which is performed by the inter-vehicle distance control when the brake operating state sensing section senses an end of the brake operation.

15. The vehicle control system as claimed in claim 14, wherein the control unit is configured to perform the inter-vehicle distance control by setting, to a set inter-vehicle distance, an inter-vehicle distance when the accelerator operating state sensing device senses the decreasing direction of the accelerator operating amount, and the host vehicle speed becomes substantially equal to the preceding vehicle speed.

16. The vehicle control system as claimed in claim 15, wherein the vehicle control system further comprises an inter-vehicle distance control start switch configured to hold a state in which the inter-vehicle distance control is performed, and a constant speed running control section configured to perform a constant speed running to converge to a set speed;

and the control unit is configured to perform the constant speed running control when the vehicle speed is equal to or greater than a predetermined speed, when the preceding vehicle is not sensed during the inter-vehicle distance control, and the accelerator operating state sensing section senses the decreasing direction of the accelerator operating amount, and to perform the deceleration control when the vehicle speed is smaller than the predetermined speed, when the preceding vehicle is not sensed during the inter-vehicle distance control, and the accelerator operating state sensing section senses the decreasing direction of the accelerator operation amount.

17. The vehicle control system as claimed in claim 16, wherein the vehicle control system further comprises an inter-vehicle distance control start switch arranged to hold a state in which the inter-vehicle distance control is performed, and a preceding vehicle sensing device arranged to sense the preceding vehicle;

the accelerator operating state sensing device is configured to sense a return speed of the accelerator operation; and

the control unit is configured to perform the deceleration control when the sensed accelerator return speed is equal to or greater than a predetermined return speed during the constant speed running.

18. The vehicle control system as claimed in claim 17, wherein the deceleration control has a deceleration degree substantially identical to a deceleration degree of an engine braking of the vehicle.

19. The vehicle control system as claimed in claim 14, wherein the vehicle control system further comprises a preceding vehicle sensing device arranged to sense the preceding vehicle;

and the control unit is configured to operate the acceleration control limit section when the preceding vehicle sensing device senses the preceding vehicle, and to stop the inter-vehicle distance control and to perform the deceleration control when the preceding vehicle sensing device does not sense the preceding vehicle.

20. The vehicle control system as claimed in claim 19, wherein the deceleration control has a deceleration degree substantially identical to a deceleration degree of the engine braking of the vehicle.