Vehicle Movement Controller

• US 20120209489A1
• Filed: 08/10/2010
• Published: 08/16/2012
• Est. Priority Date: 10/23/2009
• Status: Abandoned Application

• Current Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: Saito, Shinjiro, Takahashi, Junya, Yamakado, Makoto, Yokoyama, Atsushi
• Application Number:
  US13/503,249
• Publication Number:
  US 20120209489A1
• Time in Patent Office: Days
• US Class Current: 701/70
• CPC Class Codes: B60T 13/662 characterised by specified functions of the control system components
• CPC Class Codes: B60T 2201/16 Curve braking control, e.g. turn control within ABS control algorithm
• CPC Class Codes: B60T 7/042 by electrical means, e.g. using travel or force sensors
• CPC Class Codes: B60W 2520/125 Lateral acceleration
• CPC Class Codes: B60W 2552/30 Road curve radius
• CPC Class Codes: B60W 2720/106 Longitudinal acceleration
• CPC Class Codes: B60W 30/143 Speed control B60W30/16 takes precedence
• CPC Class Codes: B60W 30/18009 related to particular drive situations
• CPC Class Codes: B60W 30/18145 Cornering
• CPC Class Codes: B60W 50/0097 Predicting future conditions

Abstract

There is provided a vehicle motion control device that defines a pre-curve entry deceleration amount taking the deceleration amount that occurs while traveling a curve into consideration. A vehicle motion control device 6 comprises: a lateral motion-coordinated acceleration/deceleration calculation means 11 that calculates lateral motion-coordinated acceleration/deceleration Gx_dGy, which is the longitudinal acceleration/deceleration of a vehicle 0 that is coordinated with lateral motion, in accordance with lateral jerk Gy_max that acts on the vehicle 0 at curve entry; and a vehicle speed control device 12, which calculates pre-curve entry deceleration Gx_preC that is to be generated with respect to the vehicle 0 before entering the curve, taking lateral motion-coordinated acceleration/deceleration Gx_dGy calculated by the lateral motion-coordinated acceleration/deceleration calculation device 11 into consideration. Thus, over-deceleration of pre-curve entry deceleration Gx_preC may be prevented, and the connection between pre-curve entry deceleration Gx_preC and lateral motion-coordinated acceleration/deceleration Gx_dGy made smooth, thereby mitigating the sense of unnaturalness experienced by the driver.

Claims

1. A vehicle motion control device that performs acceleration/deceleration control of a vehicle at curve entry and/or curve exit, the vehicle motion control device comprising:

lateral motion-coordinated acceleration/deceleration calculation means that calculates lateral motion-coordinated acceleration/deceleration, which is longitudinal acceleration/deceleration that is coordinated with lateral motion of the vehicle in accordance with lateral jerk that acts on the vehicle at curve entry; and

a vehicle speed control device that calculates pre-curve entry deceleration that is to be generated with respect to the vehicle before entering the curve, taking into consideration the lateral motion-coordinated acceleration/deceleration calculated by the lateral motion-coordinated acceleration/deceleration calculation device.

2. The vehicle motion control device according to claim 1, further comprising curve information acquisition means that acquires curve information comprising information on a curve radius of the curve and a distance from the vehicle to the curve, wherein

the lateral motion-coordinated acceleration/deceleration calculation means calculates estimated lateral jerk that estimates the lateral jerk based on the curve information acquired by the curve information acquisition means, and calculates estimated lateral motion-coordinated acceleration/deceleration that estimates the lateral motion-coordinated acceleration/deceleration based on the estimated lateral jerk, and

the vehicle speed control device calculates the pre-curve entry deceleration based on the estimated lateral motion-coordinated acceleration/deceleration calculated by the lateral motion-coordinated acceleration/deceleration calculation means.

3. The vehicle motion control device according to claim 2, wherein the lateral motion-coordinated acceleration/deceleration calculation means calculates maximum lateral acceleration that acts on the vehicle while traveling the curve based on the curve information and vehicle speed, and calculates the estimated lateral jerk based on the maximum lateral acceleration.

4. The vehicle motion control device according to claim 3, wherein the lateral motion-coordinated acceleration/deceleration calculation means calculates the estimated lateral jerk by approximating a rate at which the lateral acceleration increases up to the maximum lateral acceleration with a linear equation.

5. The vehicle motion control device according to claim 1, further comprising acceleration/deceleration combining means that calculates an acceleration/deceleration order value for controlling acceleration/deceleration of the vehicle based on the pre-curve entry deceleration calculated by the vehicle speed control device and the lateral motion-coordinated acceleration/deceleration calculated by the lateral motion-coordinated acceleration/deceleration calculation means.

6. The vehicle motion control device according to claim 5, wherein the acceleration/deceleration combining means maintains a maximum value of the pre-curve entry deceleration as the acceleration/deceleration order value.

7. The vehicle motion control device according to claim 5, wherein the acceleration/deceleration combining means compares a maximum value of the pre-curve entry deceleration calculated by the vehicle speed control device and the lateral motion-coordinated acceleration/deceleration calculated by the lateral motion-coordinated acceleration/deceleration calculation means, and takes the greater of the two to be the acceleration/deceleration order value.

8. The vehicle motion control device according to claim 6, wherein the acceleration/deceleration combining means decreases the acceleration/deceleration order value in accordance with a decrease in the lateral motion-coordinated acceleration/deceleration.

9. The vehicle motion control device according to claim 1, further comprising:

brake order value calculation means that calculates a brake order value that controls deceleration of the vehicle based on a manipulation amount of a brake pedal; and

acceleration/deceleration combining means that calculates, based on the brake order value calculated by the brake order value calculation means and the lateral motion-coordinated acceleration/deceleration calculated by the lateral motion-coordinated acceleration/deceleration calculation means, an acceleration/deceleration order value that controls the acceleration/deceleration of the vehicle.

10. The vehicle motion control device according to claim 9, wherein

if the brake pedal is being manipulated and the lateral motion-coordinated acceleration/deceleration is not calculated by the lateral motion-coordinated acceleration/deceleration calculation means, the acceleration/deceleration combining means takes the brake order value calculated by the brake order value calculation means to be the acceleration/deceleration order value, and

if calculation of the lateral motion-coordinated acceleration/deceleration is started by the lateral motion-coordinated acceleration/deceleration calculation device while the brake pedal is being manipulated and the calculated lateral motion-coordinated acceleration/deceleration becomes equal to or greater than a predetermined value, the acceleration/deceleration combining means maintains the brake order value as the acceleration/deceleration order value.

11. The vehicle motion control device according to claim 10, wherein, once the manipulation amount of the brake pedal becomes 0, the acceleration/deceleration combining means compares the acceleration/deceleration order value and the lateral motion-coordinated acceleration/deceleration, and, if the lateral motion-coordinated acceleration/deceleration is lower in deceleration than the acceleration/deceleration order value, causes the acceleration/deceleration order value to asymptotically converge towards the lateral motion-coordinated acceleration/deceleration.

12. A vehicle motion control device that performs acceleration/deceleration control of a vehicle at curve entry and/or curve exit, the vehicle motion control device comprising:

lateral motion-coordinated acceleration/deceleration calculation means that calculates lateral motion-coordinated acceleration/deceleration, which is longitudinal acceleration/deceleration that is coordinated with lateral motion of the vehicle in accordance with lateral jerk that acts on the vehicle at curve exit; and

vehicle speed control means that calculates curve exit acceleration of the vehicle, taking into consideration the lateral motion-coordinated acceleration/deceleration calculated by the lateral motion-coordinated acceleration/deceleration calculation means.

13. The vehicle motion control device according to claim 12, wherein the lateral motion-coordinated acceleration/deceleration calculated by the lateral motion-coordinated acceleration/deceleration calculation device is maintained at, but only while an accelerator pedal is being stepped on, a maximum value of acceleration calculated in a curve transition zone in which lateral acceleration of the vehicle decreases.

14. The vehicle motion control device according to claim 13, wherein the lateral motion-coordinated acceleration/deceleration calculated by the lateral motion-coordinated acceleration/deceleration calculation device is maintained at a maximum value of acceleration calculated in a curve transition zone in which lateral acceleration of the vehicle decreases, and is decreased in accordance with a decrease in accelerator opening.