Vehicle

Patent metadata

Field	Value
Publication number	US-9725014-B2
Application number	US-201414440419-A
Country	US
Kind code	B2
Filing date	Jul 30, 2014
Priority date	Jul 31, 2013
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

Provided is a vehicle that can improve vehicle posture control or operation performance during accelerating turn. A vehicle is provided with: a left drive wheel and a right drive wheel connected to a motor; a required drive power amount input device for inputting a required drive power amount; and a required turn amount input device for inputting a required turn amount. The vehicle further includes a turn control device that adjusts a power difference between the left drive wheel and the right drive wheel on the basis of a time derivative value of the required drive power amount in addition to the required turn amount.

First claim

The invention claimed is:

1. A vehicle comprising:
a left drive wheel and a right drive wheel that are connected to a prime mover;
a requested-amount-of-drive-power input device configured to input a requested amount of drive power;
a requested-amount-of-turn input device configured to input a requested amount of turn; and
a turn control apparatus configured to adjust a power difference between the left drive wheel and the right drive wheel by using the requested amount of turn input by the requested-amount-of-turn input device, the turn control apparatus being configured to obtain a time differential of the requested amount of drive power input by the requested-amount-of-drive-power input device and adjust the power difference between the left drive wheel and the right drive wheel by using the obtained time differential of the requested amount of drive power,
wherein:
the prime mover includes a first prime mover connected to the left drive wheel, and a second prime mover connected to the right drive wheel,
the turn control apparatus controls power of the first prime mover and the second prime mover in order to adjust the power difference by using the time differential of the requested amount of drive power,
the first prime mover and the second prime mover comprise electric motors, respectively, configured to generate power in a forward direction and generating power in a reverse direction of the vehicle, and
the turn control apparatus controls one of the first prime mover and the second prime mover, which corresponds to an outer one of the wheels while the vehicle is making a turn, in order to generate the power in the forward direction, and further controls one of the first prime mover and the second prime mover, which corresponds to an inner one of the wheels while the vehicle is making the turn, in order to generate the power in the reverse direction to adjust the power difference.

2. The vehicle according to claim 1 , wherein the turn control apparatus increases the power difference as the time differential of the requested amount of drive power becomes greater.

3. The vehicle according to claim 1 , wherein, assuming that the time differential of the requested amount of drive power is constant, the turn control apparatus makes the power difference smaller when the rotational speed of the left drive wheel is high rather than when the rotational speed of the left drive wheel is low, or when the rotational speed of the right drive wheel is high rather than when the rotational speed of the right drive wheel is low.

4. The vehicle according to claim 1 , wherein, assuming that the time differential of the requested amount of drive power is constant, the turn control apparatus makes the power difference smaller when the requested amount of turn is small rather than when the requested amount of turn is large.

5. The vehicle according to claim 1 , wherein:
the turn control apparatus calculates an additive power, which is added to power of an outer one of the left drive wheel and the right drive wheel while the vehicle is making a turn, and a subtractive power, which is subtracted from power of an inner one of the left drive wheel and the right drive wheel while the vehicle is making the turn, on a basis of the time differential of the requested amount of drive power; and
the turn control apparatus makes an absolute value of the additive power and the absolute value of the subtractive power equal to each other.

6. The vehicle according to claim 1 , wherein:
the first prime mover and the second prime mover comprise electric motors, respectively, configured to generate power in a forward direction and generating power in a reverse direction of the vehicle; and
the vehicle further comprises an electric energy storage device, which is connected electrically to the electric motors.

7. A vehicle comprising:
a left drive wheel and a right drive wheel that are connected to a prime mover;
a requested-amount-of-drive-power input device configured to input a requested amount of drive power;
a requested-amount-of-turn input device configured to input a requested amount of turn; and
a turn control apparatus configured to adjust a power difference between the left drive wheel and the right drive wheel by using the requested amount of turn input by the requested-amount-of-turn input device, the turn control apparatus being configured to obtain a time differential of the requested amount of drive power input by the requested-amount-of-drive-power input device and adjust the power difference between the left drive wheel and the right drive wheel by using the obtained time differential of the requested amount of drive power,
wherein:
the prime mover and the left drive wheel are connected to each other through a first power transmitting mechanism,
the prime mover and the right drive wheel are connected to each other through a second power transmitting mechanism,
the turn control apparatus controls the first power transmitting mechanism and the second power transmitting mechanism in order to adjust the power difference by using the time differential of the requested amount of drive power,
the first power transmitting mechanism includes a first engaging and disengaging unit configured to switch between an engaged state, for transmitting power between the prime mover and the left drive wheel, and a disengaged state, for cutting off transmission of power between the prime mover and the left drive wheel;
the second power transmitting mechanism includes a second engaging and disengaging unit configured to switch between an engaged state, for transmitting power between the prime mover and the right drive wheel, and a disengaged state, for cutting off transmission of power between the prime mover and the right drive wheel; and
the turn control apparatus controls the first engaging and disengaging unit and the second engaging and disengaging unit in order to switch between the engaged state and the disengaged state, to adjust the power difference by using the time differential of the requested amount of drive power.

8. The vehicle according to claim 7 , wherein the turn control apparatus increases the power difference as the time differential of the requested amount of drive power becomes greater.

9. The vehicle according to claim 7 , wherein, assuming that the time differential of the requested amount of drive power is constant, the turn control apparatus makes the power difference smaller when the rotational speed of the left drive wheel is high rather than when the rotational speed of the left drive wheel is low, or when the rotational speed of the right drive wheel is high rather than when the rotational speed of the right drive wheel is low.

10. The vehicle according to claim 7 , wherein, assuming that the time differential of the requested amount of drive power is constant, the turn control apparatus makes the power difference smaller when the requested amount of turn is small rather than when the requested amount of turn is large.

11. The vehicle according to claim 7 , wherein:
the turn control apparatus calculates an additive power, which is added to power of an outer one of the left drive wheel and the right drive wheel while the vehicle is making a turn, and a subtractive power, which is subtracted from power of an inner one of the left drive wheel and the right drive wheel while the vehicle is making the turn, on a basis of the time differential of the requested amount of drive power; and
the turn control apparatus makes an absolute value of the additive power and the absolute value of the subtractive power equal to each other.

12. A vehicle comprising:
a left drive wheel an

Assignees

• Honda Motor Co Ltd

Inventors

• Honda Tomokazu
• Kobayashi Akiyoshi
• YOSHIMI Shintaro

Classifications

• B60T2201/14

  Electronic locking-differential · CPC title

• F16H48/06

  with gears having orbital motion · CPC title

• B60L2240/24

  Steering angle · CPC title

• B60L2210/40

  DC to AC converters · CPC title

• B60L15/2036 Primary

  Electric differentials, e.g. for supporting steering vehicles · CPC title