US 9,862,270 B2Granted

Control device for four wheel drive vehicle

AssigneeToyota Jidosha Kabushiki Kaisha

InventorYoshinori Maeda

Life of this patent

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Abstract

A control device for a four wheel drive vehicle. Differential limitation is applied to both of right and left rear wheels, with 2WD_d state being maintained, by executing two wheel control for engaging or half-engaging a first clutch and a second clutch. As the two wheel drive control is executed, a moment that suppresses the rotation speed difference between the right and left rear wheels acts on the right and left rear wheels even in the 2WD_d state. When the rotation speed difference occurs between the right and left rear wheels, a braking force is allowed to act on the vehicle wheel on the high rotation side and a driving force is allowed to act on the vehicle wheel on the low rotation side through the execution of the two wheel drive control so that a stable moment acts on the vehicle without a transition to a 4WD state.

Claims9

Dependent claims

A control device for a four wheel drive vehicle, the four wheel drive vehicle including:

a disconnection mechanism configured to connect/disconnect a first power transmission path transmitting a part of power of a driving force source transmitted to main driving wheels to auxiliary driving wheels during four wheel drive of the four wheel drive vehicle;
a first clutch disposed in a second power transmission path between the disconnection mechanism and a left wheel of the auxiliary driving wheels;
and
a second clutch disposed in a third power transmission path between the disconnection mechanism and a right wheel of the auxiliary driving wheels,
the control device comprising:
an electronic control unit configured to:
(a) switch an operation state of the disconnection mechanism, the first clutch, and the second clutch in accordance with a traveling state of the four wheel drive vehicle, and
(b) execute a two wheel drive control for engaging or half-engaging the first clutch and the second clutch, based on the traveling state of the four wheel drive vehicle, with a two wheel drive state where the disconnection mechanism is released being maintained.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/312,831Filed 26 May 2015
Priority: JP 2014-11178229 May 2014
Published: US 2017/0113546 A127 Apr 2017
Granted: 9 Jan 2018
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

B60K 23/04
Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for: for differential gearing
B60K 17/3515
Including arrangements for suppressing or influencing the power transfer, e.g. viscous clutches: with a clutch adjacent to traction wheel, e.g.…
B60K 2023/043
For differential gearing: control means for varying left-right torque distribution, e.g. torque vectoring
B60Y 2300/022
Control of vehicle driving stability: stability in turns or during cornering