Motion control system for vehicle based on jerk information

• US 7,979,180 B2
• Filed: 05/15/2008
• Issued: 07/12/2011
• Est. Priority Date: 05/18/2007
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Yamakado, Makoto, Abe, Masato, Imura, Shinya
• Primary Examiner(s): Black; Thomas G
• Assistant Examiner(s): MARC-COLEMAN, MARTHE Y
• Application Number:
  US12/121,323
• Publication Number:
  US 20090192675A1
• Time in Patent Office: 1,153 Days
• Field of Search: 701/71, 701/1, 701 36- 38, 701/44, 701/45, 303/147, 303/191, 303/121, 180/65.3
• US Class Current: 701/38
• CPC Class Codes: B60T 2230/02 Side slip angle, attitude angle, floating angle, drift angle
• CPC Class Codes: B60T 2230/04 Jerk, soft-stop; Anti-jerk, reduction of pitch or nose-dive when braking
• CPC Class Codes: B60T 8/1755 Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2520/125 Lateral acceleration
• CPC Class Codes: B60W 2520/14 Yaw
• CPC Class Codes: B60W 2520/28 Wheel speed
• CPC Class Codes: B60W 2720/14 Yaw
• CPC Class Codes: B60W 30/045 Improving turning performance
• CPC Class Codes: B60W 30/18145 Cornering
• CPC Class Codes: B60W 40/064 Degree of grip
• CPC Class Codes: B60W 40/103 Side slip angle of vehicle body

Abstract

A motion control system for a vehicle including includes control means for controlling a yaw moment of the vehicle, first detection means for detecting a longitudinal velocity (V) of the vehicle, second detection means for detecting a lateral jerk (Gy_dot) of the vehicle, and third detection means for detecting a yaw angular acceleration (r_dot) of the vehicle. The yaw moment of the vehicle is controlled by the control means so that a difference between the yaw angular acceleration (r_dot) detected by the third detection means and a value (Gy_dot/V) obtained by dividing the lateral jerk (Gy_dot) of the vehicle detected by the second detection means by the longitudinal velocity (V) detected by the first detection means, becomes small.

Claims

1. A motion control system for a vehicle comprising:

control means for controlling a longitudinal acceleration of the vehicle;

first detection means for detecting a longitudinal velocity (V) of the vehicle;

second detection means for detecting a lateral jerk (Gy_dot) of the vehicle; and

third detection means for detecting a lateral acceleration (Gy) of the vehicle;

wherein the control means controls longitudinal acceleration of the vehicle based on a physical value that is proportional to a value obtained by dividing the quantity (Gy_dot/V), being a ratio of the lateral jerk (Gy_dot) of the vehicle detected by the second detection means to the longitudinal velocity (V) of the vehicle detected by the first detection means, by the lateral acceleration (Gy) of the vehicle detected by the third detection means.

2. A motion control system for a vehicle comprising:

control means for controlling a longitudinal acceleration of the vehicle;

first detection means for detecting a longitudinal velocity of the vehicle;

second detection means for detecting a lateral acceleration (Gy) of the vehicle;

wherein,

lateral jerk (Gy_dot) of the vehicle is obtained by the control means on the basis of the lateral acceleration (Gy) detected by the second detection means; and

the control means controls longitudinal acceleration of the vehicle based on a physical value that is proportional to a value obtained by dividing the quantity (Gy_dot/V), being a ratio of the lateral jerk (Gy_dot) of the vehicle to the longitudinal velocity (V) of the vehicle detected by the first detection means, by the lateral acceleration (Gy) of the vehicle detected by the second detection means.

3. A motion control system for a vehicle comprising:

control means for controlling a longitudinal acceleration of the vehicle;

wherein the control means controls longitudinal acceleration of the vehicle based on a value obtained by multiplying lateral jerk (Gy_dot) of the vehicle by a prestored gain (KGyV) determined by a longitudinal velocity (V) and a longitudinal acceleration (Gy) of the vehicle.