Vehicle rear wheel lift tendency judgment device

Patent metadata

Field	Value
Publication number	US-9561785-B2
Application number	US-201514625323-A
Country	US
Kind code	B2
Filing date	Feb 18, 2015
Priority date	Feb 18, 2014
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

A vehicle rear wheel lift tendency judgment device: includes a first deceleration obtaining device for obtaining a first deceleration along a first straight line, being a component in a first direction of an acceleration on a center of gravity, and a second deceleration obtaining device for obtaining a second deceleration along a second straight line, being a component in a second direction of the acceleration; judges that a rear wheel tends to be lifted, when the first deceleration is greater in the first direction than a first threshold, or when the second deceleration is greater in the second direction than a second threshold; and performs at least one of setting for shifting the first threshold in a direction opposite to the first direction and setting for shifting the second threshold in a direction opposite to the second direction, when a second-deceleration change rate being a change amount in the second deceleration per unit time becomes greater in the second direction than a change-rate threshold, enabling a quick judgment of a rear wheel lift tendency.

First claim

What is claimed is:

1. A vehicle rear wheel lift tendency judgment device which is installed in a vehicle including a front wheel and a rear wheel, and judges whether or not the rear wheel is likely to be lifted, wherein
when in a side view, a first straight line represents a straight line which joins a center of gravity of the vehicle and a ground contact point of the front wheel; a second straight line represents a straight line which passes the center of gravity and is orthogonal to the first straight line; a first direction represents a direction which extends along the first straight line, and which points from the center of gravity to the ground contact point; and a second direction represents a direction which extends along the second straight line, and in which the vehicle turns forward around the ground contact point,
the judgment device comprises:
a first deceleration obtaining device for obtaining a first deceleration which is a component in the first direction of an acceleration on the center of gravity; and
a second deceleration obtaining device for obtaining a second deceleration which is a component in the second direction of the acceleration on the center of gravity, wherein

the judgment device judges that the rear wheel is likely to be lifted, when the first deceleration is greater in the first direction than a first threshold value, or when the second deceleration is greater in the second direction than a second threshold value, and
the judgment device performs at least one of setting for shifting the first threshold value in a direction opposite to the first direction and setting for shifting the second threshold value in a direction opposite to the second direction, when a second-deceleration change rate, which is a change amount in the second deceleration per unit time, becomes greater in the second direction than a change-rate threshold value.

2. The vehicle rear wheel lift tendency judgment device according to claim 1 , further comprising:
a speed-in-traveling-direction obtaining device for obtaining a traveling-direction speed of the vehicle, wherein
when the traveling-direction speed becomes greater than a speed threshold value, the judgment device performs setting for shifting the second threshold value in the second direction.

3. The vehicle rear wheel lift tendency judgment device according to claim 2 , wherein
when the second-deceleration change rate becomes greater in the second direction than the change-rate threshold value, the judgment device performs the setting for shifting the second threshold value in the direction opposite to the second direction regardless of the traveling-direction speed.

4. The vehicle rear wheel lift tendency judgment device according to claim 1 , wherein the judgment device performs the setting for shifting the first threshold value in the direction opposite to the first direction so that the first deceleration comes closer to the first threshold value in the first direction as the second deceleration comes closer to the second threshold value in the second direction.

5. The vehicle rear wheel lift tendency judgment device according to claim 1 , wherein
the vehicle is a two-wheeled motor vehicle, and
an acceleration sensor for detecting an acceleration of the vehicle is housed right under a seat on which a driver gets seated, or inside a cover disposed in a rear of the seat.

6. The vehicle rear wheel lift tendency judgment device according to claim 2 , wherein the judgment device performs the setting for shifting the first threshold value in the direction opposite to the first direction so that the first deceleration comes closer to the first threshold value in the first direction as the second deceleration comes closer to the second threshold value in the second direction.

7. The vehicle rear wheel lift tendency judgment device according to claim 3 , wherein the judgment device performs the setting for shifting the first threshold value in the direction opposite to the first direction so that the first deceleration comes closer to the first threshold value in the first direction as the second deceleration comes closer to the second threshold value in the second direction.

8. The vehicle rear wheel lift tendency judgment device according to claim 2 , wherein
the vehicle is a two-wheeled motor vehicle, and
an acceleration sensor for detecting an acceleration of the vehicle is housed right under a seat on which a driver gets seated, or inside a cover disposed in a rear of the seat.

9. The vehicle rear wheel lift tendency judgment device according to claim 3 , wherein
the vehicle is a two-wheeled motor vehicle, and
an acceleration sensor for detecting an acceleration of the vehicle is housed right under a seat on which a driver gets seated, or inside a cover disposed in a rear of the seat.

Assignees

• Honda Motor Co Ltd
• Nissin Kogyo Kk

Inventors

• Iizuka Chikashi
• Toda Makoto
• Kitagawa Hiroki
• Hasegawa Tetsuya
• Kodaira Nobuyuki
• Tsuchiya Tomoharu

Classifications

• B60T8/171

  Detecting parameters used in the regulation; Measuring values used in the regulation · CPC title

• B60T8/172 Primary

  Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters {(B60T8/17551 takes precedence)} · CPC title

• B60T8/1706 Primary

  for single-track vehicles, e.g. motorcycles · CPC title

• B60T8/3225

  Systems specially adapted for single-track vehicles, e.g. motorcycles (B60T8/3235 takes precedence) · CPC title

• B60T8/261

  specially adapted for use in motorcycles · CPC title