Motor vehicle

Patent metadata

Field	Value
Publication number	US-2016129911-A1
Application number	US-201514932172-A
Country	US
Kind code	A1
Filing date	Nov 4, 2015
Priority date	Nov 7, 2014
Publication date	May 12, 2016
Grant date	—

Abstract

A motor vehicle is controlled: during a prescribed transition from an accelerator ON state to an accelerator OFF and brake OFF state, the control unit makes a rear wheel distribution ratio that is a ratio of a torque of the rear wheel to a sum of a torque of the front wheel and the torque of the rear wheel, change to a first prescribed distribution ratio after changing from a value during the accelerator ON state to a second prescribed distribution ratio that is larger than the first prescribed distribution ratio.

First claim

What is claimed is:

1 . A motor vehicle, comprising:
a motor for a front wheel that is configured to input motive power to the front wheel and receive motive power output from the front wheel; a motor for a rear wheel that is configured to input motive power to the rear wheel and receive motive power output from the rear wheel; a battery that is configured to transfer electric power to or receive electric power from the motor for the front wheel and the motor for the rear wheel; and a control unit that is configured to control the motor for the front wheel and the motor for the rear wheel so as to travel through a demand torque corresponding to an accelerator operation and a brake operation, wherein during a prescribed transition from an accelerator ON state to an accelerator OFF and brake OFF state, the control unit makes a rear wheel distribution ratio that is a ratio of a torque of the rear wheel to a sum of a torque of the front wheel and the torque of the rear wheel, change to a first prescribed distribution ratio after changing from a value during the accelerator ON state to a second prescribed distribution ratio that is larger than the first prescribed distribution ratio.

2 . The motor vehicle according to claim 1 , wherein the first prescribed distribution ratio is a distribution ratio determined in accordance with a gravity center position of the vehicle during parking.

3 . The motor vehicle according to claim 1 , wherein a value of the second prescribed distribution ratio is 1.

4 . The motor vehicle according to claim 1 , wherein during the prescribed transition, the control unit makes the rear wheel distribution ratio change from the second prescribed distribution ratio to the first prescribed distribution ratio by a second change degree smaller than a first change degree after changing from the value during the accelerator ON state to the second prescribed distribution ratio by the first change degree.

5 . The motor vehicle according to claim 1 , further comprises a braking force application device that is configured to apply a braking force generated based on a hydraulic pressure to the front wheel and the rear wheel,
wherein during a brake ON state, the control unit controls the motor for the front wheel, the motor for the rear wheel and the braking force application device so as to travel through the demand torque, and when the brake ON state takes place after the prescribed transition, the control unit keeps the rear wheel distribution ratio to be a value immediately before the brake ON state.

6 . The motor vehicle according to claim 1 , further comprises:
an engine; a generator; and a planetary gear having three rotary elements connected with a drive shaft for the front wheel connected to the front wheel, an output shaft of the engine and a rotating shaft of the generator.

7 . The motor vehicle according to claim 1 , further comprises:
an engine; and a spinner motor, the spinner motor having an inner rotor connected with the engine and an outer rotor connected with a drive shaft for the front wheel connected to the front wheel, and converting motive power from the engine into electric power.

8 . The motor vehicle according to claim 1 , further comprises:
an engine; a clutch disposed between the engine and the motor for the front wheel; and a transmission connected with the motor for the front wheel and a drive shaft for the front wheel connected to the front wheel.

Assignees

• Toyota Motor Co Ltd

Inventors

• Takahashi Yoshimitsu

Classifications

• B60K6/445 Primary

  Differential gearing distribution type · CPC title

• B60W10/26

  for electrical energy, e.g. batteries or capacitors · CPC title

• B60W30/18172 Primary

  Preventing, or responsive to skidding of wheels · CPC title

• B60W2710/083

  Torque · CPC title

• B60W2520/26

  Wheel slip · CPC title