Honda Motor Co., Ltd.

Sei Shinohara

Akihiro Yamamoto

Satoshi Ando

Masatoshi Noguchi

Makoto Tsuchihashi

Satoshi Andou

Masakatsu Hori

Keiichi Ooiso

Takeshi Hoshinoya

Yoshihiro Kanamaru

Jun Aoki

Nobuyuki Hiramatsu

Tomokazu Katayama

A vehicle drive system includes a left-wheel drive unit having a first motor and a first transmission, a right-wheel drive unit having a second motor and a second transmission, and a motor control unit. Each of the first and second transmissions has a first to third rotational elements. The first motor is connected to the first rotational element of the first transmission. The second motor is connected to the first rotational element of the second transmission. The left wheel is connected to the second rotational element of the first transmission. The right wheel is connected to the second rotational element of the second transmission. The third rotational element of the first transmission and the third rotational element of the second transmission are coupled to each other. Each of the first and second transmissions has a fourth rotational element which is supported to revolve around by the second rotational element.

Vehicle drive system

A vehicle driving system includes: a left wheel driving system having a first motor and a first speed changer; a right wheel driving system having a second motor and a second speed changer; a motor controller which controls the first motor and the second motor, a rotation restricting unit which can be shifted between a released state and an applied state; and a rotation restricting unit controller which controls the rotation restricting unit. When the rotation restricting unit controller shifts the rotation restricting unit from the applied state to the released state, the motor controller controls the first motor and the second motor so that a torque sum of the first motor and the second motor approaches zero while maintaining a torque difference between the first motor and the second motor.

Vehicle driving system

In a drive controller for a vehicle including: a drive source configured to output a drive force to a first axle serving as one of front and rear wheel axles; an electric motor configured to output a drive force to a second axle serving as the other of the front and rear wheel axles; a one-way power transmission device disposed on a power transmission pathway between the second axle and the electric motor so as to transmit a power drive force from the electric motor to the second axle; a two-way power transmission device that transmits a rotation power from the second axle to the electric motor or transmits the power drive force and a regeneration drive force from the electric motor to the second axle, the drive controller includes: a first detector that detects a speed of the vehicle or a rotation speed of the second axle; a target rotation speed determination section that determines a target rotation speed of the electric motor based on the speed of the vehicle or the rotation speed of the second axle; a second detector that detects a rotation speed of the electric motor; and a controller that controls the electric motor such that the rotation speed of the electric motor is synchronized with the target rotation speed and that controls an output torque of the electric motor or an activation of the two-way power transmission device, when the electric motor starts power drive or regeneration drive while the vehicle is traveling by the drive force from the drive source.

Drive controller for vehicle

A motor controller obtains: a first motor target rotation number, a first motor actual rotation number of a first motor, a second motor target rotation number, and a second motor actual rotation number of a second motor; determines a first rotation number difference between the first motor target rotation number and the first motor actual rotation number of the first motor, and a second rotation number difference between the second motor target rotation number and the second motor actual rotation number of the second motor, determines first and second rotation control torques based on a smaller one of the first rotation number difference and the second rotation number difference; and determines a first motor torque of the first motor and a second motor torque of the second motor based on the first and second rotation control torques.

Vehicle driving system and vehicle driving system control method

A control system that performs control of an electric motor is described. The control system may include a rotating body inertia torque computing unit that uses a rotational state of a vehicle wheel when braking is applied to the wheel to calculate an inertia torque of rotating bodies residing within a span behind the wheel, among members that rotate by the driving force of the electric motor. The control system also may include a controller that performs control of the electric motor to cancel the inertia torque of the rotating bodies based on the calculation result from the rotating body inertia torque computing unit.

Methods and systems for controlling an electric motor

A rear-wheel drive system includes motors for generating driving force to drive a vehicle, hydraulic brakes on power transmission lines between the motors and rear wheels switching a motors side and a wheels side to a connected state or a disconnected state, an ECU controlling the motors and the brakes and a one-way clutch in parallel with the hydraulic brakes on the transmission line configured to be engaged when a forward rotational power on the motors side is inputted into the wheels side and disengaged when a backward rotational power on the motors side is inputted into the wheels side and vice versa. The ECU causes the hydraulic brakes to be applied so as to put the motors side and the wheels side in the connected state when the forward rotational power on the motors side is inputted into the wheels side.

In the case where a vehicleruns forward, when both two electric motorsA,B power the vehicle, an oil pressure controllerreleases hydraulic brakesA,B; when both the two electric motorsA,B perform a regenerative braking, actuates the hydraulic brakesA,B. When one of the two electric motorsA,B powers the vehicle and the other motor performs regenerative braking, the oil pressure controllercontrols releases or actuates the hydraulic brakesA,B based on a power driving torque and a regenerative braking torque.

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Saitama, Japan

Sei Shinohara