Patent ID: 8700241
Filing Date: 2014-04-15
Classification: B60K,B60L,B60W,Y02T

Abstract:
1. A drive control device for a standby four-wheel drive vehicle having primary drive wheels coupled to a drive source including a motor generator that generates a regenerative braking torque and a clutch device disposed between the drive source and secondary drive wheels to switch a two-wheel drive state using the primary drive wheels and a four-wheel drive state using the primary drive wheels and the secondary drive wheels, comprising: an electronic control device which serves as a transmission torque control portion having a first regenerative braking control portion and a second regenerative braking control portion, wherein the first regenerative braking control portion causes the clutch device to set a transmission torque between the drive source and the secondary drive wheels to zero so as to allow only the primary drive wheels to perform regenerative braking when a request braking torque of the vehicle is equal to or lower than a predetermined primary-drive-wheel regeneration limit torque during the regenerative braking by the motor generator, the second regenerative braking control portion causes the clutch device to generate the transmission torque between the drive source and the secondary drive wheels so as to allow the primary drive wheels and the secondary drive wheels to perform the regenerative braking when the request braking torque exceeds the primary-drive-wheel regeneration limit torque, and the second regenerative braking control portion controls the transmission torque of the clutch device to adjust a regenerative braking torque of the secondary drive wheels such that a value acquired by subtracting a predetermined given correction value from a rotation speed of the secondary drive wheels becomes substantially equal to a rotation speed of the primary drive wheels, when the request braking torque exceeds the primary-drive-wheel regeneration limit torque.