Subaru Corporation

Hiroshi Tatekawa

Takeshi Yoneda

Akihiro Nabeshima

Norio Oowada

Katsuya Higuchi

Masaki Takami

Yuichi Tanaka

Tatsuhiro Kubo

Kazuki Fujisawa

A hybrid all-wheel-drive vehicle includes an engine, first and second motor generators, a first clutch between the second motor generator and a front wheel, a second clutch between the second motor generator and a rear wheel, and a control unit that controls, based on a vehicle traveling state, the engine, the motor generators, and the clutches. The first motor generator is coupled to the engine and the front wheel in a manner capable of transmitting torque. During regeneration, the control unit engages the first clutch and disengages the second clutch. When the all-wheel-drive vehicle shifts from motor traveling to hybrid traveling, the control unit restarts the engine by operating the first motor generator and regulates engagement forces of the clutches and output torque of the second motor generator to compensate driving torque of the front wheel by the second motor generator while maintaining driving torque of the rear wheel.

Hybrid all-wheel-drive vehicle

An HEV-CU determines whether a traveling state requires giving priority to a front and rear driving force control (e.g., whether a vehicle is cornering) on the basis of a traveling state of the vehicle. If the traveling state requires giving priority to the front and rear driving force control (e.g., the vehicle is cornering), the HEV-CU-preferentially controls of an engine and a motor generator as well as engagement force of a differential limiting clutch in accordance with friction force between front and rear wheels and a road surface. If the traveling state does not require giving priority to the front and rear driving force control (e.g., the vehicle is traveling straight), the HEV-CU preferentially controls the driving of the motor generator to cause a charged state (SOC) of a high-voltage battery that supplies electric power to the motor generator to fall within a predetermined range.

Control apparatus for all-wheel-drive hybrid electric vehicle

When the operation amount of an accelerator exceeds a predetermined value at a time of climbing over a bump with either one of right and left front wheels, a HEV-CU increases the regenerative torque of a first motor generator, reduces the output torque of a second motor generator, and increases the engagement force of a LSD clutch of a center differential unit so as to reduce the input torque of a front LSD. When the operation amount of the accelerator exceeds the predetermined value at a time of climbing over a bump with either one of left and right rear wheels, the HEV-CU increases the regenerative torque of the first motor generator, reduces the output torque of the second motor generator, and reduces the engagement force of the LSD clutch so as to reduce the input torque of the rear LSD.

A power transmission mechanism includes a first pinion gear meshed with a first sun gear coupled to a first output shaft; a second pinion gear meshed with a second sun gear coupled to a second output shaft and meshed with the first pinion gear; a differential case coupled to an input shaft and supporting the first and second pinion gears; an internal gear rotatable about the axes of the first and second output shafts; a motor generator coupled to the internal gear; a first one-way clutch including a first inner ring member configured to move in conjunction with the first pinion gear and a first outer ring member meshed with the internal gear; and a second one-way clutch including a second inner ring member configured to move in conjunction with the second pinion gear and a second outer ring member meshed with the internal gear.

Growing community of inventors

Tokyo, Japan

Hiroshi Tatekawa