Honda Motor Co., Ltd.

Jiro Hara

Yusuke Sakaguchi

Ryuichi Murakami

Yasuhiko Sugo

Masahide Ueda

Nor Hairuddin

Naoharu Takatani

Takatani Naoharu

Provided is a driving force control device for a four-wheel-drive vehicle that can evade an occurrence of excessive understeer and oversteer in situations unintended by the driver, by appropriately controlling driving forces to be distributed to sub-drive wheels. The driving force distribution device of the four-wheeled vehicle controls driving force to be distributed to the rear wheels (Wr, Wr) by the clutch () for front-and-rear torque distribution so that the wheels (Wf, Wf) are main drive wheels and the rear wheels (Wr, Wr) are sub-drive wheels. The driving force distribution device is adapted to perform control to restrict the upper limit of the four-wheel drive torque based upon an estimated driving force and steering angle of the vehicle, when calculating four-wheel drive torque to be distributed to the rear wheels (Wr, Wr) by the driving force distribution device ().

Driving force control device for four-wheel-drive vehicle

In the case where a difference between rotational speeds of right and left wheels detected by wheel speed sensors is less than a predetermined value, a right and left wheel power transmission control section distributes driving force between the right and left wheels so that a total value of the driving force of the right and left wheels does not exceed a limit value set up by a front and rear wheels power transmission control section. In the case where the difference between the rotational speeds of the right and left wheels is the predetermined value or more, the right and left wheel power transmission control section transmits the driving force up to a driving force upper limit for each wheel to the respective right and left rear wheels regardless of the total value of the driving force of the right and left rear wheels.

Driving force distribution device

A driving force control apparatus for a four-wheel drive vehicle is provided for stably launching the vehicle irrespective of whichever condition of a road surface and whether or not a road is gradient. In the driving force control apparatus for a four-wheel drive vehicle configured to transmit a driving force of a prime mover directly to a left and a right main driving wheel and to a left and a right sub-driving wheel through a clutch, rotational speed sensors detect the rotational speed of the respective main driving wheels and sub-driving wheels, a 2/4 WD&#x2022;ECU sets a fastening force of the clutch in accordance with a difference between the detected rotational speeds of the main driving wheels and the sub-driving wheels, determines that the four-wheel drive vehicle is in a slip stop state when at least one of the detected rotational speeds of the wheels is equal to or lower than a predetermined rotational speed, and corrects the clutch for the set fastening force when it determines that the four-wheel drive vehicle is in the slip stop state.

Driving force control apparatus for four-wheel drive vehicle

Growing community of inventors

Wako, Japan

Jiro Hara