Braking device of motorcycle

• US 20060138858A1
• Filed: 12/20/2005
• Published: 06/29/2006
• Est. Priority Date: 12/22/2004
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Takenouchi, Kazuya, Nakayama, Masanobu, Tani, Kazuhiko
• Granted Patent: US 7,841,671 B2
• Time in Patent Office: Days
• US Class Current: 303/9.640
• CPC Class Codes: B60T 8/261 specially adapted for use in motorcycles
• CPC Class Codes: B62L 3/023 acting on fluid pressure systems

Abstract

To enhance a brake feel of a motorcycle adopting a combined brake system. In a braking device for adjusting hydraulic pressure supplied to a brake caliper on the side of a rear wheel according to hydraulic pressure on the side of a front wheel produced by a brake operation on the side of the front wheel of a motorcycle, a pattern for adjusting a brake caliper pressure on the side of the rear wheel is different between a case when a temporal increasing rate of master cylinder pressure on the side of the front wheel is equal to or exceeds a predetermined value and a case when the temporal increasing rate is below the predetermined value. Further, to provide a braking device for a motorcycle wherein a variation of a vertical load of a rear wheel when a brake is applied on the side of a front wheel is inhibited

Claims

1. A braking device for a motorcycle in which hydraulic pressure on the side of the rear wheel supplied to a wheel braking means on the side of the rear wheel is adjusted according to hydraulic pressure on the side of the front wheel produced by a brake operation on the side of the front wheel, comprising:

the hydraulic pressure on the side of the rear wheel is controlled according to a temporal increasing rate of the hydraulic pressure on the side of the front wheel.

2. The braking device for a motorcycle according to claim 1, wherein a pattern for adjusting the hydraulic pressure on the side of the rear wheel is different between a case when the temporal increasing rate of the hydraulic pressure on the side of the front wheel is equal to or exceeds a predetermined value and a case when the temporal increasing rate is below the predetermined value.

3. The braking device for a motorcycle according to claim 2, wherein a pattern for adjusting the hydraulic pressure on the side of the rear wheel in a case when the increasing rate is equal to or exceeds the predetermined value is set according to elapsed time since the increasing rate reaches the predetermined value;

at first, the hydraulic pressure on the side of the rear wheel abruptly increases;

afterward, the hydraulic pressure on the side of the rear wheel becomes substantially fixed; and

the hydraulic pressure on the side of the rear wheel gradually decreases.

4. The braking device for a motorcycle according to claim 1, comprising:

pressure sensing means for sensing hydraulic pressure on the side of the front wheel produced by a brake operation on the side of the front wheel;

pressure sensing means for sensing hydraulic pressure supplied to a wheel braking means on the side of the front wheel; and

pressure sensing means for sensing hydraulic pressure supplied to wheel braking means on the side of the rear wheel.

5. The braking device for a motorcycle according to claim 2, comprising:

pressure sensing means for sensing hydraulic pressure on the side of the front wheel produced by a brake operation on the side of the front wheel;

pressure sensing means for sensing hydraulic pressure supplied to a wheel braking means on the side of the front wheel; and

pressure sensing means for sensing hydraulic pressure supplied to wheel braking means on the side of the rear wheel.

6. The braking device for a motorcycle according to claim 3, comprising:

pressure sensing means for sensing hydraulic pressure on the side of the front wheel produced by a brake operation on the side of the front wheel;

pressure sensing means for sensing hydraulic pressure supplied to a wheel braking means on the side of the front wheel; and

pressure sensing means for sensing hydraulic pressure supplied to wheel braking means on the side of the rear wheel.

7. The braking device for a motorcycle according to claim 2, wherein in the pattern for adjusting hydraulic pressure, in a case when a temporal increasing rate of the hydraulic pressure on the side of the front wheel is equal to or exceeds a predetermined value, a larger hydraulic pressure than the hydraulic pressure on the side of the rear wheel is set in a case when the temporal increasing rate is below the predetermined value.

8. The braking device for a motorcycle according to claim 7, wherein:

the pattern for adjusting hydraulic pressure is set in a hydraulic pressure map for the hydraulic pressure on the side of the front wheel; and

a hydraulic pressure map in a case when the temporal increasing rate of the hydraulic pressure on the side of the front wheel is below the predetermined value is set so that hydraulic pressure on the side of the rear wheel increases in a region in which the hydraulic pressure on the side of the front wheel is small, becomes fixed in a region in which the hydraulic pressure on the side of the front wheel is middle and gradually decreases in a region in which the hydraulic pressure on the side of the front wheel is large.

9. The braking device for a motorcycle according to claim 6, wherein for a hydraulic pressure map in a case when the temporal increasing rate of the hydraulic pressure on the side of the front wheel is equal to or exceeds the predetermined value, a fixed value is set that is larger than the fixed value.

10. The braking device for a motorcycle according to claim 9, wherein a hydraulic pressure value retrieved based upon the hydraulic pressure map gradually decreases after a predetermined time elapses.

11. The braking device for a motorcycle according to claim 10, wherein a map value in a case when the temporal increasing rate of the hydraulic pressure on the side of the front wheel is equal to or exceeds the predetermined value and a map value in a case when the temporal increasing rate is below the predetermined value are compared;

and

the larger map value is set as a hydraulic pressure value on the side of the rear wheel.

12. A braking device for a motorcycle provided with an input state detecting means for detecting the behavior of a braking member on the side of a front wheel and a hydraulic pressure modulator for producing hydraulic pressure according to a detection signal from the input state detecting means and applying the hydraulic pressure to wheel braking means on the side of the front wheel, comprising:

full braking judging means for judging whether a rider fully applies the brake on the side of the front wheel or not based upon the behavior of the braking member on the side of the front wheel;

wherein when the full braking judging means judges that full braking is applied, the full braking judging means increases hydraulic pressure produced by the hydraulic pressure modulator according to a detection signal from the input state detecting means and changes a pressure intensification characteristic of the wheel braking means on the side of the front wheel.

13. The braking device for a motorcycle according to claim 12, comprising:

a master cylinder for producing hydraulic pressure according to a manipulated variable of a braking member;

a pressure sensor on the input side for sensing the hydraulic pressure of the master cylinder; and

a pressure sensor on the output side for sensing the hydraulic pressure of wheel braking means on the side of a front wheel;

wherein in braking, feedback control is applied to the hydraulic pressure of the hydraulic pressure modulator based upon signals from the pressure sensor on the input side and the pressure sensor on the output side; and

the full braking judging means judges whether full braking is applied or not based upon the rate of a change of master cylinder pressure acquired based upon a value sensed by the pressure sensor on the input side and a value sensed by the pressure sensor on the output side.

14. The braking device for a motorcycle according to claim 12, wherein hydraulic pressure to be applied to wheel braking means on the side of a front wheel from the hydraulic pressure modulator is electrically controlled based upon a detection signal of the input state detecting means.

15. The braking device for a motorcycle according to claim 13, wherein hydraulic pressure to be applied to wheel braking means on the side of a front wheel from the hydraulic pressure modulator is electrically controlled based upon a detection signal of the input state detecting means.

16. The braking device for a motorcycle according to claim 12, wherein a state of a slip of a front wheel is detected and wheel braking means on the side of the front wheel is controlled by ABS.

17. The braking device for a motorcycle according to claim 13, wherein a state of a slip of a front wheel is detected and wheel braking means on the side of the front wheel is controlled by ABS.

18. The braking device for a motorcycle according to claim 14, wherein a state of a slip of a front wheel is detected and wheel braking means on the side of the front wheel is controlled by ABS.