Fluid-pressure and analogous brake systems – Speed-controlled – With yaw control
Patent
1997-01-17
1999-08-31
Graham, Matthew C.
Fluid-pressure and analogous brake systems
Speed-controlled
With yaw control
303187, B60T 824, B60T 832
Patent
active
059443936
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a turn control apparatus for a vehicle, which stabilizes turn behavior of vehicle by controlling the braking force on the wheel thereof when a vehicle is turned.
BACKGROUND ART
Turn control apparatuses for a vehicle have been disclosed, it, for example, in Unexamined Japanese Patent Publication No. 1-237252 and Unexamined Japanese Patent Publication No. 3-143757. In the control apparatus disclosed in the former Publication, when a vehicle turns while being braked, the braking force on the right and left rear wheels is increased or decreased according to the yaw angular velocity of the vehicle. Thereby, a yaw moment can be produced on the vehicle to prevent a spin thereof. In the control apparatus in the latter Publication, the braking force on the front and rear wheels is controlled according to the turning condition of the vehicle when the vehicle turns while being braked. Thereby, a yaw moment can be produced on the vehicle to assist a turning thereof.
For the control apparatus in the former Publication, the braking force on only the right and left rear wheels of the vehicle is controlled, so that the yaw moment generated on the vehicle by this control is relatively small. Therefore, there is a possibility that a spin of the vehicle cannot be prevented effectively depending on the turning condition of the vehicle.
For the control apparatus in the latter Publication, the braking force on all of four wheels of the vehicle are controlled. Therefore, even if the driver attempts to apply a stronger braking force to the vehicle during the control, the driver's intention is not reflected. For this reason, this control apparatus is not preferable in view of safety when a fault of the control apparatus during the control is considered.
An object of the present invention is to provide a turn control apparatus for a vehicle, which reliably stabilizes the turn behavior of the vehicle when the vehicle is turned, while fully maintaining the safety of the vehicle.
DISCLOSURE OF THE INVENTION
The above object is achieved by a turn control apparatus for a vehicle in accordance with the present invention. The turn control apparatus for a vehicle comprises determining means for determining the vehicle turning condition. The determining means includes turn detecting means for detecting a turn of the vehicle and outputting a turn signal indicative of a turn direction of the vehicle and braking detecting means for detecting the braking of the vehicle and outputting a braking signal indicative of a braking condition of the vehicle. The turn control apparatus further comprises selecting means for selecting the outside front and inside rear wheels viewed in the vehicle turn direction as two target wheels to be controlled based on the turn signal from the turn detecting means, and first braking control means for increasing the braking force on one target wheel to be controlled and decreasing the braking force on the other target wheel to be controlled in accordance with the vehicle turning condition determined by the determining means when the vehicle is braked.
According to the above-described turn control apparatus, when the vehicle turns while being braked, the outside front wheel and inside rear wheels viewed in the vehicle turn direction are selected as the target wheels to be controlled, and the braking forces on these target wheels to be controlled are increased and decreased in accordance with the vehicle turning condition. Therefore, a turning yaw moment or restoration moment necessary for the vehicle is given to the vehicle. When the braking forces on the target wheels to be controlled, or the outside front wheel and inside rear wheel viewed in the vehicle turn direction, are controlled, the turning moment or restoration moment to be given to the vehicle is generated most effectively, by which the turn behavior of the vehicle is stabilized. The number of target wheels to be controlled is few, being two, so that the braking forces on the wheels can easily be control
REFERENCES:
patent: 4971174 (1990-11-01), Abe et al.
patent: 4998593 (1991-03-01), Karnopp et al.
patent: 5015041 (1991-05-01), Kuwana et al.
patent: 5458405 (1994-03-01), Watanabe
patent: 5584540 (1996-12-01), Takeuchi et al.
patent: 5645326 (1997-07-01), Sand
Graham Matthew C.
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
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