Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration
Reexamination Certificate
1998-12-07
2001-02-27
Louis-Jacques, Jacques H. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Indication or control of braking, acceleration, or deceleration
C701S072000, C701S082000, C701S090000, C303S140000, C303S146000, C303S150000
Reexamination Certificate
active
06195606
ABSTRACT:
TECHNICAL FIELD
This invention relates to a vehicle active brake control that compensates for the bank angle of a road surface.
BACKGROUND OF THE INVENTION
Chassis control technology has achieved noteworthy progress, thanks to advancements in sensing and computing technologies as well as advances in estimation and control theory. This has permitted the design of various control systems using active means to maneuver the vehicle. One such enhancement is the control and adjustment of the tire forces through a braking force distribution control strategy, using a steering angle sensor, a lateral accelerometer, and a yaw rate sensor to enable a yaw rate feedback control.
The measured values of both lateral acceleration and steering angle are influenced by the bank angle of the road surface; the lateral accelerometer senses a bank-related component of gravity force, and the measured steering angle includes a bank-related steering correction necessary to maintain the intended travel path. It is known, as described in the U.S. Pat. No. 5,720,533 to Pastor et. al., issued on Feb. 24, 1998, and assigned to the assignee of the present invention, that a bank angle compensation term can be computed as a function of the measured lateral acceleration and yaw rate if steady state operating conditions are assumed. Additionally, the compensation can be estimated as a function of yaw rate error in systems that lack a lateral accelerometer, as described in U.S. Ser. No. 09/134954, filed on Aug. 17, 1998, now U.S. Pat. No. 6,112,147 also assigned to the assignee of the present invention. What is desired is a method of compensating a vehicle yaw rate control for operation on a banked surface during both transient and steady state operating conditions.
SUMMARY OF THE INVENTION
The present invention is directed to an improved active brake control method which compensates for the effects of a banked road surface under both steady state and transient operating conditions of the vehicle. The control includes an observer for estimating the lateral velocity of the vehicle as a means of determining vehicle slip angle, and a time derivative of the estimated lateral velocity is used along with measured values of lateral acceleration, vehicle speed and yaw rate to compute the lateral acceleration component due to the banked road surface, referred to herein as the bank acceleration. The bank acceleration, in turn, is then used to correct the values of measured steering angle and the measured lateral acceleration used (1) to develop the desired yaw rate, slip angle and lateral acceleration, and (2) to estimate the surface coefficient of adhesion and slip angle. Partial compensation can be achieved by applying suitable gain factors to the computed bank acceleration, if desired.
REFERENCES:
patent: 4834205 (1989-05-01), Mizuno et al.
patent: 5063514 (1991-11-01), Headley et al.
patent: 5172961 (1992-12-01), Inoue et al.
patent: 5229944 (1993-07-01), Yasuno
patent: 5275475 (1994-01-01), Hartmann et al.
patent: 5311431 (1994-05-01), Cao et al.
patent: 5341296 (1994-08-01), Yasuno et al.
patent: 5341297 (1994-08-01), Zomotor et al.
patent: 5366281 (1994-11-01), Littlejohn
patent: 5402342 (1995-03-01), Ehret et al.
patent: 5428532 (1995-06-01), Yasuno
patent: 5444621 (1995-08-01), Matsunaga et al.
patent: 5446658 (1995-08-01), Pastor et al.
patent: 5480219 (1996-01-01), Kost et al.
patent: 5702165 (1997-12-01), Koibuchi
patent: 5720533 (1998-02-01), Pastor et al.
patent: 5742919 (1998-04-01), Ashrafi et al.
patent: 5746486 (1998-05-01), Paul et al.
patent: 5869753 (1999-02-01), Asanuma et al.
patent: 5882092 (1999-03-01), Koibuvhi
patent: 5931887 (1999-08-01), Hac
patent: 5964819 (1999-10-01), Naito
patent: 6035251 (2000-03-01), Hac et al.
patent: 6112147 (2000-08-01), Ghoneim et al.
patent: 6122584 (2000-09-01), Lin et al.
patent: 6125319 (2000-09-01), Hac et al.
patent: 6973065 (2000-06-01), Brown et al.
patent: 41 23 235 C1 (1992-11-01), None
patent: 41 21 954 A1 (1993-01-01), None
patent: 42 00 061 A1 (1993-07-01), None
patent: 42 23 385 A1 (1994-01-01), None
patent: 42 29 504 A1 (1994-03-01), None
patent: 43 11 077 A1 (1994-10-01), None
patent: 43 14 827 A1 (1994-11-01), None
patent: 0 555 860 A1 (1993-08-01), None
patent: 2 275 551 (1993-01-01), None
patent: 2 263 340 (1993-07-01), None
patent: 2 269 571 (1994-02-01), None
patent: 2 275 312 (1994-08-01), None
patent: 40 52 62213 (1993-10-01), None
patent: 40 60 24304 (1994-02-01), None
patent: 40 60 87421 (1994-03-01), None
patent: 40 61 15418 (1994-04-01), None
patent: 40 61 27354 (1994-05-01), None
May the Cornering Force Be With You; Popular Mechanics; Dec. 1995, pp. 74-77.
Stable as She Goes: Don Sherman, Automotive Industries, May 1995.
The Spin Doctors: Don Sherman, 12PS95.
Mercedes/Bosch ESP; Automotive Industries, Apr. 1995.
Controlling Vehicle Stability; Christopher A. Sawyer, Automotive Industries, Jan. 1995.
Let Magic Fingers Do the Driving: Wards Auto World; May 1995.
Technoid: Intelligent Brakes Are on the Way; Car and Driver, Aug. 1994.
Toyota Vehicle Stability Control System; Automotive Engineering, Aug. 1995.
Vehicle Dynamics Offers New Level of Safety: Machine Design, Sep. 1994.
Handling Control Systems for Your Car: Popular Electronics; Feb. 1995.
VDC, the Vehicle Dynamics Control System of Bosch: A. VanZanten, R. Erhardt and G. Pfaff; Robert Bosch GmbH; No. 950759, pp. 9-26. No Date.
Active Stability Control; Junichi Kubokawa, Aisin Seiki Co., Ltd., Electronics & Brake Division; Abstract; Sep. 1995.
Consideration of Lateral and Longitudinal Vehicle Stability by Function Enhanced Brake and Stability Control System; Heinz Leffler; SAE #940832; Feb. 28 -Mar. 3, 1994.
Control of Vehicle Dynamics: Automotive Engineering; pp. 87-93; May 1995.
Improvement of Vehicle Maneuverability by Direct YAW Moment Control; Y. Shibahata, K. Shimada and T. Tomari; Society of Automotive Engineers of Japan, Inc.; pp. 464-481, 1993.
Spin Control for Cars; Steven Ashley; Mechanical Engineering; pp. 66-68; Jun. 1995.
Barta David John
Hac Aleksander Boguslaw
General Motors Corporation
Louis-Jacques Jacques H.
Sigler Robert M.
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