Two-wheeled motor vehicle brake control method and system

• US 8,186,769 B2
• Filed: 01/24/2006
• Issued: 05/29/2012
• Est. Priority Date: 01/24/2006
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG, Bosch Corporation (Robert Bosch GmbH)
• Original Assignee: Bayerische Motoren Werke AG, Bosch Corporation (Robert Bosch GmbH)
• Inventors: Ogawa, Takahiro, Westerfeld, Helge, Hamm, Markus
• Primary Examiner(s): SCHWARTZ, CHRISTOPHER P
• Application Number:
  US12/161,370
• Publication Number:
  US 20100231032A1
• Time in Patent Office: 2,317 Days
• Field of Search: 303 961- 969, 303/137, 303/155
• US Class Current: 303/9.64
• CPC Class Codes: B60T 2240/06 Wheel load; Wheel lift
• CPC Class Codes: B60T 8/1706 for single-track vehicles, e.g. motorcycles
• CPC Class Codes: B60T 8/1766 Proportioning of brake forces according to vehicle axle loads, e.g. front to rear of vehicle
• CPC Class Codes: B60T 8/261 specially adapted for use in motorcycles
• CPC Class Codes: B60T 8/3225 Systems specially adapted for single-track vehicles, e.g. motorcycles B60T8/3235 takes precedence
• CPC Class Codes: B60T 8/5006 Pressure reapplication by pulsing of valves B60T8/5012, B60T8/5018, B60T8/505, B60T8/5056 take precedence

Abstract

To enable, with respect to a vehicle whose vehicle body is easily lifted to a relatively large extent even in a relatively early stage when rear wheel lifting is detected, more rapid and reliable securement of the safety of the vehicle body with respect to that rear wheel lifting.

When lifting of a rear wheel is detected, in contrast to what has conventionally been the case, pressure reduction of brake pressure of a front wheel is immediately started (S100, S102) regardless of whether or not there is occurrence of skidding of the front wheel, a stepwise reduction of brake pressure is performed while lifting of the rear wheel is being detected, and when the integrated amount of that amount of pressure reduction reaches a predetermined value, pressure reduction is ended even in a state where rear wheel lifting is being detected.

Claims

1. A two-wheeled motor vehicle brake control system configured to be

capable of transmitting oil pressure arising in a front brake master cylinder in response to operation of a first brake operator to a front wheel cylinder via an oil pressure system,

capable of transmitting oil pressure arising in a rear brake master cylinder in response to operation of a second brake operator to a rear wheel cylinder via an oil pressure system,

capable of discharging brake fluid of the front wheel cylinder to a front reservoir as desired, and

capable of detecting whether or not there is lifting of a rear wheel,

wherein the brake control system is configured to immediately reduce the brake pressure of a front wheel by a predetermined pressure when lifting of the rear wheel is detected, and next perform pressure increase of the front wheel, while lifting is being detected, by an amount that is different from the amount of pressure reduction.

2. The two-wheeled motor vehicle brake control system as recited in claim 1, wherein the pressure increase of the front wheel is by an amount that is less than the amount of pressure reduction.

3. A two-wheeled motor vehicle brake control method comprising:

transmitting oil pressure arising in a front brake master cylinder in response to operation of a first brake operator to a front wheel cylinder via an oil pressure system,

transmitting oil pressure arising in a rear brake master cylinder in response to operation of a second brake operator to a rear wheel cylinder via an oil pressure system, discharging brake fluid of the front wheel cylinder to a front reservoir as desired, detecting whether or not there is lifting of a rear wheel,

immediately reducing the brake pressure of a front wheel by a predetermined pressure when lifting of the rear wheel is detected, and

increasing brake pressure of the front wheel, while lifting is being detected, by an amount that is different from the amount of pressure reduction.

4. The two-wheeled motor vehicle brake control method as recited in claim 3, wherein the pressure increase of the front wheel is by an amount that is less than the amount of pressure reduction.

5. A two-wheeled motor vehicle brake control system configured to be capable of transmitting oil pressure arising in a front brake master cylinder in response to operation of a first brake operator to a front wheel cylinder via an oil pressure system, capable of transmitting oil pressure arising in a rear brake master cylinder in response to operation of a second brake operator to a rear wheel cylinder via an oil pressure system, capable of discharging brake fluid of the front wheel cylinder to a front reservoir as desired, and capable of detecting whether or not there is lifting of a rear wheel,

wherein the brake control system is configured to immediately start reduction of the brake pressure of the front wheel when lifting of the rear wheel is detected, perform, in a stepwise manner, reduction of the brake pressure of the front wheel while lifting of the rear wheel is being detected and, when an integrated amount of stepwise pressure reduction reaches a predetermined value, end pressure reduction even in a state where rear wheel lifting is being detected.

6. A two-wheeled motor vehicle brake control method comprising:

transmitting oil pressure arising in a front brake master cylinder in response to operation of a first brake operator to a front wheel cylinder via an oil pressure system,

transmitting oil pressure arising in a rear brake master cylinder in response to operation of a second brake operator to a rear wheel cylinder via an oil pressure system, discharging brake fluid of the front wheel cylinder to a front reservoir as desired, and

detecting whether or not there is lifting of a rear wheel,

immediately starting reduction of the brake pressure of the front wheel when lifting of the rear wheel is detected,

reducing the brake pressure of the front wheel in a stepwise manner while lifting of the rear wheel is being detected and,

when an integrated amount of stepwise pressure reduction reaches a predetermined value, ending pressure reduction even in a state where rear wheel lifting is being detected.