Patent ID: 6540642
Filing Date: 2003-04-01
Classification: B60K,B60W,Y02T,Y10S,Y10T

Abstract:
A four-wheel-drive vehicle control system comprising:a synchro-mesh transmission, which transmits a torque therethrough; a first drive source that generates the torque for driving wheels; a first transmission path through which the torque is transmitted from the first drive source via the synchro-mesh transmission; a clutch disposed in the first transmission path, which is automatically engaged or disengaged upon gear shifting of the synchro-mesh transmission; a second drive source that generates the torque for driving wheels; a second transmission path through which the torque is transmitted from the second drive source without passing through the synchro-mesh transmission; and a control portion that drives and controls the second drive source so as to generate the torque to be transmitted from the second drive source to the wheels upon gear shifting of the synchro-mesh transmission, wherein the wheels include first wheels disposed in the first transmission path and second wheels disposed in the second transmission path, the torque generated by the first drive source is transmitted to the first wheels via the synchro-mesh transmission and the torque generated by the second drive source is transmitted to the second wheels without passing through the synchro-mesh transmission, and an amount of increase of the torque transmitted from the second drive source to the second wheels upon gear shifting of the synchro-mesh transmission is varied depending on whether the torque is transmitted only to the first wheels upon gear shifting of the synchro-mesh transmission or the torque is transmitted to the first wheels and the second wheels upon gear shifting of the synchro-mesh transmission.