Patent ID: 9020723
Filing Date: 2015-04-28
Classification: B60K,B60W

Abstract:
1. A driving force distribution controller that is mounted on a four-wheel drive vehicle comprising an engine for generating a driving force, a gearbox for changing output speed of the engine, a clutch capable of interrupting torque transmission between the engine and the gearbox, and a driving force transmission system capable of transmitting an output of the gearbox to either front or rear wheels as main drive wheels and to other remaining wheels as auxiliary drive wheels, the driving force distribution controller comprising: a control device that calculates a command torque value to be transmitted to the auxiliary drive wheels; and a driving force transmission device that transmits torque corresponding to the command torque value to the auxiliary drive wheels, wherein the control device comprises: a first control means that calculates a torque value to be transmitted to the auxiliary drive wheels according to a running condition; and a second control means that determines the torque value calculated by the first control means to be the command torque value when a rotational speed of the engine is not lower than a first threshold value or when a vehicle speed is not higher than a second threshold value, and that reduces the torque value calculated by the first control means and determines the reduced torque value to be the command torque value when the rotational speed of the engine is lower than the first threshold value and when the vehicle speed is higher than the second threshold value.