Fluid-pressure and analogous brake systems – Speed-controlled – With yaw control
Patent
1997-01-15
1998-10-27
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
With yaw control
3031135, 303 962, B60T 864
Patent
active
058269517
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a turn control apparatus for a vehicle, which imparts a yaw moment based on the difference in braking force between vehicle wheels to a vehicle.
BACKGROUND ART
A turn control apparatus for a vehicle of this type has been disclosed, for example, in Unexamined Japanese Patent Publication No. 4-257755. This known turn control apparatus has first and second functions. According to the first control function, a difference in braking force between predetermined wheels is produced according to the turning condition of a vehicle when the vehicle turns. Based on this difference in braking force, a desired yaw moment is given to the vehicle, by which the turn behavior of the vehicle can be controlled so as to be the target turn characteristic. According to the second control function, the braking force of vehicle is controlled so that the slip factor is in a predetermined range. Specifically, the second control function means brake pressure control using an antiskid brake system (ABS).
However, in the case of the known turn control system, when brake pressure control using ABS is started, the first control function is achieved, so that the target wheel to be controlled is switched. In this case, if the braking force of the target wheel to be controlled is increased by the first control function, that wheel itself is liable to be locked. or this reason, it is impossible to properly achieve both of the first control function, that is, the yaw moment control of vehicle, and the function of ABS.
An object of the present invention is to provide a turn control apparatus for a vehicle, in which both of the brake pressure control of vehicle using ABS and the yaw moment control of vehicle can be achieved, and the turn behavior of vehicle can be stabilized.
DISCLOSURE OF THE INVENTION
The above object is achieved by the turn control apparatus for a vehicle in accordance with the present invention, and this turn control apparatus comprises first selecting means for selecting two target wheels to be controlled as first target wheels according to a turning condition of the vehicle when the vehicle turns while being braked; first braking control means for controlling the turn behavior of the vehicle by increasing the braking force of one first target wheel and decreasing the braking force of the other second target wheel, thereby giving one of turning and restoration moments to the vehicle; second selecting means for selecting one wheel as a second target wheel from the wheels other than the first target wheels according to the vehicle turn direction when the vehicle is braked to a critical extent and when the vehicle turns; and second braking control means for decreasing the braking force of the second target wheel when the braking force of the first target wheels is controlled by said first braking control means.
According to the above-described turn control apparatus, when a vehicle turns while being braked, the braking force of one first target wheel is increased and the other first target wheel is decreased according to a turning condition of the vehicle, so that a desired yaw moment is given to the vehicle. As a result, the turn behavior of the vehicle is stabilized. In such a turning state of the vehicle, if the braking of the vehicle reaches the critical condition, and the braking force of the first target wheels is controlled independently of the yaw moment control, the effect of yaw moment control is reduced. However, when the vehicle is braked to a critical extent, a second target wheel is selected from the wheels other than the first target wheels according to the turn direction of the vehicle, and the braking force of the second target wheel is decreased. Consequently, a turning moment or a restoration moment is given to the vehicle, by which the turn behavior of the vehicle is stabilized. In this case, since the yaw moment control reduces the braking force of the second target wheel, the second target wheel is not liable to be locked.
When the second target whe
REFERENCES:
patent: 4898431 (1990-02-01), Karnopp et al.
patent: 5474369 (1995-12-01), Inagaki et al.
patent: 5576959 (1996-11-01), Hvorat et al.
patent: 5636909 (1997-06-01), Hirao et al.
Graham Matthew C.
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
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