Brake system and vehicle

Patent metadata

Field	Value
Publication number	US-9751507-B2
Application number	US-201415033548-A
Country	US
Kind code	B2
Filing date	Oct 29, 2014
Priority date	Oct 31, 2013
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

A brake system does not change immediately an operating condition of a left front brake although a slipping condition is detected at the left front wheel based on a signal detected by a left detector in such a state that a slipping condition is not detected at a right front wheel based on a signal detected by a right detector, and does not change immediately an operating condition of a right front brake although a slipping condition is detected at the right front wheel based on a signal detected by the right detector in such a state a slipping condition is not detected at the left front wheel based on a signal detected by the left detector.

First claim

The invention claimed is:

1. A brake system for a vehicle, the brake system comprising:
a right front brake on a right front wheel of the vehicle to generate a braking force on the right front wheel;
a left front brake on a left front wheel of the vehicle to generate a braking force on the left front wheel;
an input operated by a rider;
a right front wheel slip detector that detects a slipping condition of the right front wheel;
a left front wheel slip detector that detects a slipping condition of the left front wheel; and
a brake activator that, at least while the vehicle is turning with the body frame leaning in a left-and-right direction of the vehicle:
does not change an operating condition of the left front brake of the left front wheel immediately based on a signal detected by the left front wheel slip detector while both the right front brake and the left front brake are in operation as a result of operation of the input and in such a state that the slipping condition of the right front wheel is not detected based on a signal detected by the right front wheel slip detector even though the slipping condition of the left front wheel is detected based on the signal detected by the left front wheel slip detector; and
does not change an operating condition of the right front brake of the right front wheel immediately based on a signal detected by the right front wheel slip detector while both the right front brake and the left front brake are in operation as a result of operation of the input and in such a state that the slipping condition of the left front wheel is not detected based on a signal detected by the left front wheel slip detector even though the slipping condition of the right front wheel is detected based on the signal detected by the right front wheel slip detector.

2. The brake system according to claim 1 , wherein
in case the slipping condition still continues at the left front wheel, the brake activator controls the operating condition of the left front brake of the left front wheel so as to reduce the braking force on the left front wheel to lower than the braking force on the left front wheel obtained as a result of the operation of the input; and
in case the slipping condition still continues at the right front wheel, the brake activator controls the operating condition of the right front brake of the right front wheel so as to reduce the braking force on the right front wheel to lower than the braking force on the right front wheel obtained as a result of the operation of the input.

3. The braking system according to claim 1 , wherein
in case the slipping condition still continues at the left front wheel and the slipping condition is detected at the right front wheel based on the signal detected by the right front wheel slip detector, the brake activator controls both the operating condition of the left front brake of the left front wheel and the operating condition of the right front brake of the right front wheel so as to reduce the braking force on the left front wheel and the braking force on the right front wheel to lower than braking forces obtained as a result of the operation of the input; and
in case the slipping condition still continues at the right front wheel and the slipping condition is detected at the left front wheel based on the signal detected by the left front wheel slip detector, the brake activator controls both the operating condition of the right front brake of the right front wheel and the operating condition of the left front brake of the left front wheel so as to reduce the braking force on the right front wheel and the braking force on the left front wheel to lower than braking forces obtained as a result of the operation of the input.

4. The braking system according to claim 1 , further comprising a central rear brake on the central rear wheel that generates a braking force on the central rear wheel and a central rear wheel slip detector that detects a slipping condition at the central rear wheel; wherein
in case the slipping condition still continues at the left front wheel and a slipping condition is detected at the central rear wheel based on a signal detected by the central rear wheel slip detector, the brake activator controls both the operating condition of the left front brake of the left front wheel and the operating condition of the central rear brake of the central rear wheel so as to reduce the braking force on the left front wheel and the braking force on the central rear wheel to lower than braking forces obtained as a result of the operation of the input; and
in case the slipping condition still continues at the right front wheel and the slipping condition is detected at the central rear wheel based on the signal detected by the central rear wheel slip detector, the brake activator controls both the operating condition of the right front brake of the right front wheel and the operating condition of the central rear brake of the central rear wheel so as to reduce the braking force on the right front wheel and the braking force on the central rear wheel to lower than braking forces obtained as a result of the operation of the input.

5. The braking system according to claim 1 , further comprising a central rear brake on the central rear wheel that generates a braking force on the central rear wheel and a central rear wheel slip detector that detects a slipping condition at the central rear wheel; wherein
the brake activator does not change the operating condition of the left front brake of the left front wheel unless the slipping condition is detected at the central rear wheel based on a signal detected by the central rear wheel slip detector although the slipping condition still continues at the left front wheel; and
the brake activator does not change the operating condition of the right front brake of the right front wheel unless the slipping condition is detected at the central rear wheel based on the signal detected by the central rear wheel slip detector although the slipping condition still continues at the right front wheel.

6. The braking system according to claim 1 , wherein
the brake activator does not change the operating condition of the left front brake of the left front wheel unless the slipping condition is detected at the right front wheel based on the signal detected by the right front wheel slip detector although the slipping condition still continues at the left front wheel; and
the brake activator does not change the operating condition of the right front brake of the right front wheel unless the slipping condition is detected at the left front wheel based on the signal detected by the left front wheel slip detector although the slipping condition still continues at the right front wheel.

7. A vehicle comprising:
a body frame;
a right front wheel and a left front wheel which are aligned in a left-and-right direction of the body frame when the vehicle is viewed from a front thereof with the body frame being in an upright state;
a central rear wheel behind the right front wheel and the left front wheel in a front-and-rear direction of the body frame and which is disposed between the right front wheel and the left front wheel when the vehicle is viewed from the front thereof with the body frame being in the upright state;
a right shock absorber which supports the right front wheel at a lower portion thereof and absorbs an upward displacement of the right front wheel in an up-and-down direction of the body frame;
a left shock absorber which supports the left front wheel at a lower portion thereof and absorbs an upward displacement of the left front wheel in the up-and-down direction of the body frame;
a link above the right front wheel and the left front wheel in the up-and-down

Assignees

• Yamaha Motor Co Ltd

Inventors

• Seto Hiroaki
• OHASHI Kunihide
• Yamamura Takeshi
• Tsuji Yoshinori
• Takada Hideki
• Kajihara Kunio
• Terasaka Masato
• Hamamoto Yutaka

Classifications

• B60K28/16

  responsive to, or preventing, spinning or skidding of wheels · CPC title

• B60T8/1755

  Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve (road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02) · CPC title

• B60T2230/03

  Overturn, rollover · CPC title

• B62K5/05

  characterised by a single rear wheel · CPC title

• B60T8/175

  Brake regulation specially adapted to prevent excessive wheel spin during vehicle acceleration, e.g. for traction control (safety devices for propulsion unit control responsive to, or preventing, skidding of wheels B60K28/16) · CPC title