Yaw moment control system in vehicle

F - Mech Eng,Light,Heat,Weapons – 16 – H

Patent

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Details

F16H 48/26 (2006.01) B60K 23/04 (2006.01) B60T 8/1755 (2006.01)

Patent

CA 2220905

A yaw moment control system for a vehicle is provided to prevent the reduction of the turning performance during traveling of a vehicle at a low speed, which is designed, so that a driving force and a braking force are distributed to inner and outer wheels during turning of the vehicle in order to eliminate an over-steering tendency produced upon deceleration of the vehicle during turning thereof, thereby enhancing the stability during traveling of the vehicle at a high speed. A longitudinal acceleration Xg calculated in a longitudinal acceleration calculating circuit, a lateral acceleration Yg calculated in a lateral acceleration calculating circuit and a correcting factor Kv determined in a correcting factor determining circuit are multiplied by a control amount calculating circuit. Torque proportional to the resulting product is distributed to left and right wheels to eliminate the over-steering tendency produced upon deceleration of the vehicle during the turning thereof. When the vehicle is being decelerated and the vehicle speed V is smaller, the correcting factor Kv assumes a value smaller than 1.0, and at the other time, the correcting factor Kv assumes a value of 1Ø Therefore, when the vehicle is traveling at a low vehicle speed, an under-steering tendency can be prevented from being produced by the distribution of the torque, thereby preventing the reduction in turning performance.

Système de régulation de moment de lacet pour véhicule, empêchant un véhicule de réduire sa performance pendant les virages lorsqu'il roule à faible vitesse. Le système est conçu de sorte qu'une force motrice et une force de freinage sont distribuées aux roues internes et externes pendant un virage afin d'éliminer une tendance au survirage résultant du ralentissement du véhicule lors d'un virage, ce qui améliore la stabilité lorsque le véhicule roule à grande vitesse. L'accélération longitudinale Xg, obtenue grâce à un circuit de calcul de l'accélération longitudinale, l'accélération latérale Yg, obtenue grâce à un circuit de calcul de l'accélération latérale, et un coefficient correcteur Kv, déterminé grâce à un circuit de calcul de coefficient correcteur, sont multipliés par un circuit de calcul d'une valeur de contrôle. Le couple, proportionnellement au produit de la multiplication, est distribué aux roues gauches et aux roues droites afin d'éliminer la tendance au survirage lors du ralentissement du véhicule pendant un virage. Lorsque le véhicule ralentit et que sa vitesse V est inférieure, le coefficient de correction Kv attribue une valeur inférieure à 1,0; à d'autres moments, il attribue une valeur de 1,0. Ainsi, lorsqu'un véhicule roule à faible vitesse, il est possible d'empêcher la tendance au sous-virage en distribuant le couple, ce qui permet de ne pas réduire la performance lors des virages.

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