YAMAHA YZR-M1 TECHNICAL EVOLUTION, 2007-2011 · 1. In five years of the 800cc era, the YZR-M1 took 39 victories in 88 races. 2. YAMAHA achieved three World Championship victories

YAMAHA YZR-M1 TECHNICAL EVOLUTION, 2007-2011

by KOUICHI TSUJI – YMC MotoGP Group Leader & YZR-M1 Project Leader

4th November 2011

© 2011 Yamaha Motor Co., Ltd

CONTENTS

1. General background

2. YZR-M1 developments

3. Summary of results from 2007 to 2011

4. Conclusion

GENERAL BACKGROUND

From 2007, engine capacity reduced from 990cc to 800cc to

curb maximum speed.

From 2009, maximum number of engines is 6 in order to reduce

overall cost. Bridgestone becomes MotoGP sole tyre supplier.

Lehman Shock

CHANGES OF REGULATION

CHANGES OF LAP TIME AND SPEED

YZR-M1 DEVELOPMENTS

MACHINE CONCEPT

Engine

Well balanced power and fuel

Direct and natural

feeling

Chassis

Maximize

corner speed

and agility

EMS

Enhance maximum tyre performance

Chassis

Maximize

corner speed

and agility

Braking

||

Vertical

Stiffness

Handling

||

Torsion

Stiffness

Tire Grip

||

Lateral

Stiffness

Basic character of chassis is determined by frame rigidity

CHASSIS DEVELOPMENT – FRAME RIGIDITY

Lateral

Vertical

Torsion

2007 2011

In 2011 the vertical stiffness was

lessened to reduce judder under

braking

CHASSIS DEVELOPMENT – FRAME RIGIDITY

2007 2009 2011

CdA

YAW MOMENT

-12%

Middle Fairing for Cooling

W/T: 17 degrees

O/T :23 degrees

From 2007:

CHASSIS DEVELOPMENT – AERODYNAMICS

Engine

Well balanced

power and fuel

Better

breathing

||

For more

power

Reduce Friction

||

For POWER

and Fuel

Better

Combustion

||

For POWER

and Fuel

YZR-M1 development mainly focused on reducing friction

ENGINE DEVELOPMENT – TRIPLE KEY FACTOR

Reduce

Friction

||

For POWER

and Fuel

Better

Combustion

||

For POWER

and Fuel

2007 2008 2009 2010 2011

PVS

Oil System

Airbox

Fuel System

Gearbox

Lubricant System

(for EG durability)

Case Mod

Surface Treatment

Bore x Stroke

ENGINE DEVELOPMENT – MAIN FEATURES

POWER: +16%

2011

2007

TOQ : +12%

- DURABILITY -

- EG Performance -

2007: 600 Km Mileage

2010-2011: 2400 Km Guarantee

- Fuel Consumption -

Approx. 8% improvement over 5 years

Achieved ¼ cost reduction.

- Speed Data -

2011

2007

QATAR GP 20Km/h

ENGINE DEVELOPMENT

EMS

Direct and

natural feeling

Drivability

||

Generate ideal

torque MAP

Traction

Control

||

Detect slip

correctly

Wheelie

Control

||

Predictive

Control

The key technology was “Real Time Vehicle Dynamics”

EMS DEVELOPMENT – TRIPLE KEY FACTOR

<Main ECU> <Sub ECU>

SENSOR

Acceleration

Gyro

Sus Stroke

Chassis Inf

+

Physical

Bike Model

Calculate

<Bank Angle and Tyre Force> Calculate

<Optimize TOQ>

Detect

<Condition of Bike>

Quantity of Bike angle

Quantity of Slip

Quantity of Slide

Predict Wheelies

<Real Time>

Generate Ideal Power

Ig_Cut / Ig_retard

Recognize corner No.

<Space channel>

EMS DEVELOPMENT – REAL TIME VEHICLE DYNAMICS

Ｍ・ｇ・ｔａｎφ

Ｍ・ｇ

φ

Ｍ・ｖ２/ｒ

EMS DEVELOPMENT – WHEELIE CONTROL

Fr SUS Stroke

EG TOQ

Fr Wheel Speed

Wheelie Control Area

Fr SUS Stroke

EG TOQ

Fr Wheel Speed

Wheelie Control Area

2007: Passive Wheelie Control 2008-2011: Predict Wheelie Control

Pitch Rate

Shorten the EG TOQ reduction time

More

Speed

Predict minus Stroke

Circuit Simulation

(2010 Silverstone) Combustion Simulation

CAE TECHNOLOGY – SIMULATION TECHNOLOGY

This simulation result helped for winning this race.

Simulated Lap Time

Actual Lap Time

Speed

Tail Wind 3m/sec

The figure of combustion chamber, injector location

and porting are determined by the simulation.

CFD: Computer Fluid Dynamics FEM: Finite Element Method

CAE TECHNOLOGY – ANALYSIS TECHNOLOGY

Analyze flow by using CFD to:

• Determine the air flow of the INTAKE

• Check the water flow in the engine

Analyze stress of the parts by FME to:

• Optimize durability and weight

• Countermeasure problems.

2007 through 2011: YZR-M1 won 39 races

YAMAHA was three times World Champion between 2008 and 2010

SUMMARY OF RESULTS

1. In five years of the 800cc era, the YZR-M1 took 39 victories in 88 races.

2. YAMAHA achieved three World Championship victories between 2008 and 2010.

3. The lap time of the 800cc has finally reached the 990cc bike because of:

- an increase in engine power year by year

- progress of the engine control system

- tyre development

4. The regulations governing engine limitations has had a great effect in reducing

development cost. This has allowed the provision of bikes to the satellite team at

reasonable cost.

5. YAMAHA continues to share “KANDO” around the world through MotoGP.

CONCLUSION

Q&A SESSION

Masahiko Nakajima – YMC Motorsport General Manager

Shigeto Kitagawa – President of Yamaha Motor Racing

Kouichi Tsuji – YMC MotoGP Group Leader & YZR-M1 Project Leader