FEATURES
1-19
•
Slip ratio:
When the brakes are applied, slipping occurs between the tires and the road surface. This causes a
difference between the wheel speed and the chassis speed.
Slip ratio is the value that shows the rate of wheel slippage and is defined by the following formula.
Slip ratio = (Chassis speed – Wheel speed)/Chassis speed
u
100 (%)
0 %: There is no slipping between the wheel and the road surface. The chassis speed is equal to the
wheel speed.
100 %: The wheel speed is “0”, but the chassis is moving (i.e., wheel lock).
Brake force and vehicle stability
When the brake pressure is increased, wheel speed is reduced. Slipping occurs between the tire and
the road surface and brake force is generated. The limit of this brake force is determined by the friction
force between the tire and the road surface and is closely related to wheel slippage. Wheel slippage is
represented by the slip ratio.
Side force is also closely related to wheel slippage. See figure “A”. If the brakes are applied while keep-
ing the proper slip ratio, it is possible to obtain the maximum brake force without losing much side force.
ABS allows full use of the tires’ capabilities even on slippery road surfaces or less slippery road surfac-
es. See figure “B”.
Wheel slip and hydraulic control
The ABS ECU calculates the wheel speed of each wheel according to the rotation signal received from
the front and rear wheel sensors. In addition, the ABS ECU calculates the vehicle chassis speed and
the rate of speed reduction based on the wheel speed values.
The difference between the chassis speed and the wheel speed calculated in the slip ratio formula is
equal to the wheel slip. When the wheel speed is suddenly reduced, the wheel has a tendency to lock.
When the wheel slip and the wheel speed reduction rate exceed the preset values, the ABS ECU de-
termines that the wheel has a tendency to lock.
If the slip is large and the wheel has a tendency to lock (point “A” in the following figure), the ABS ECU
reduces the hydraulic pressure in the brake caliper. Once the ABS ECU determines that the tendency
of the wheel to lock has diminished after the hydraulic pressure is reduced, it increases the hydraulic
pressure (point “B” in the following figure). The hydraulic pressure is initially increased quickly, and then
it is increased gradually.
b
c
a
A
d
(%)
a
e
f
g
B
d
(%)
a. Friction force between the tire and road sur-
face
b. Brake force
c. Side force
d. Slip ratio
e. Less slippery road surface
f. Controlling zone
g. Slippery road surface
Summary of Contents for R1 Series 2015
Page 1: ...2015 SERVICE MANUAL YZF R1 YZF R1F YZF R1M YZF R1MF 2CR 28197 E0...
Page 2: ......
Page 8: ......
Page 74: ...SPECIAL TOOLS 1 65...
Page 105: ...LUBRICATION POINTS AND LUBRICANT TYPES 2 30...
Page 110: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 35 Crankcase and cylinder right side view...
Page 112: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 37 Timing chain cover and oil pipe right side view...
Page 114: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 39 Oil pump and oil cooler bottom view...
Page 116: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 41 Camshaft and balancer shaft top view...
Page 118: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 43 Crankshaft rear view...
Page 120: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 2 45 Crankshaft and transmission top view...
Page 122: ...COOLING SYSTEM DIAGRAMS 2 47 EAS20020 COOLING SYSTEM DIAGRAMS...
Page 124: ...COOLING SYSTEM DIAGRAMS 2 49...
Page 126: ...CABLE ROUTING 2 51 EAS20021 CABLE ROUTING Handlebar front view...
Page 128: ...CABLE ROUTING 2 53 Clutch cable right side view...
Page 130: ...CABLE ROUTING 2 55 O2 sensor lead right side view...
Page 132: ...CABLE ROUTING 2 57 Electrical components tray left side view...
Page 134: ...CABLE ROUTING 2 59 ECU Engine Control Unit left side view...
Page 136: ...CABLE ROUTING 2 61 Frame top view...
Page 138: ...CABLE ROUTING 2 63 Frame top view for YZF R1M...
Page 140: ...CABLE ROUTING 2 65 Frame top view...
Page 142: ...CABLE ROUTING 2 67 Frame top view...
Page 144: ...CABLE ROUTING 2 69 Rear fender top view...
Page 146: ...CABLE ROUTING 2 71 Rear fender left side view...
Page 148: ...CABLE ROUTING 2 73 Rear brake hose right side view...
Page 150: ...CABLE ROUTING 2 75 Front brake hose left side view...
Page 152: ...CABLE ROUTING 2 77 Front brake hose left side view...
Page 154: ...CABLE ROUTING 2 79 Hydraulic unit assembly top and left side view...
Page 156: ...CABLE ROUTING 2 81 Fuel tank top and left side view...
Page 158: ...CABLE ROUTING 2 83 Air filter case and throttle bodies top and left side view...
Page 160: ...CABLE ROUTING 2 85 Air cut off valve right side view...
Page 162: ...CABLE ROUTING 2 87 Air duct left and right side view...
Page 164: ...CABLE ROUTING 2 89 Radiator left side view...
Page 166: ...CABLE ROUTING 2 91 Radiator right side view...
Page 168: ...CABLE ROUTING 2 93 Muffler top and left side view...
Page 170: ...CABLE ROUTING 2 95 CCU top and right side view for YZF R1M...
Page 172: ...CABLE ROUTING 2 97...
Page 213: ...PERIODIC MAINTENANCE 3 39 1 1 c b c b...
Page 214: ...PERIODIC MAINTENANCE 3 40...
Page 306: ...FRONT FORK for YZF R1 4 89 Refer to ADJUSTING THE FRONT FORK LEGS for YZF R1 on page 3 23...
Page 472: ...AIR INDUCTION SYSTEM 7 19 EAS20071 AIR INDUCTION SYSTEM...
Page 478: ...AIR INDUCTION SYSTEM 7 25...
Page 489: ...IGNITION SYSTEM 8 8...
Page 497: ...ELECTRIC STARTING SYSTEM 8 16...
Page 503: ...CHARGING SYSTEM 8 22...
Page 509: ...LIGHTING SYSTEM 8 28...
Page 519: ...SIGNALING SYSTEM 8 38...
Page 525: ...COOLING SYSTEM 8 44...
Page 589: ...FUEL PUMP SYSTEM 8 108...
Page 604: ...ABS Anti lock Brake System 8 123 EAS30525 ABS COMPONENTS CHART 1 2 5 6 7 8 9 10 11 12 3 4 1...
Page 606: ...ABS Anti lock Brake System 8 125 EAS30844 ABS COUPLER LOCATION CHART 2 1 3 4 5...
Page 633: ...ABS Anti lock Brake System 8 152...
Page 653: ...COMMUNICATION CONTROL SYSTEM for YZF R1M 8 172...
Page 654: ...ELECTRICAL COMPONENTS 8 173 EAS20089 ELECTRICAL COMPONENTS...
Page 656: ...ELECTRICAL COMPONENTS 8 175 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25...
Page 658: ...ELECTRICAL COMPONENTS 8 177 EAS30549 CHECKING THE SWITCHES 2 1 3 4 6 5 7 8 9 12 13 14 10 11...
Page 694: ...EVENT CODE TABLE 9 15...
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