来自http://priuschat.com/threads/mg1-mg2-rpms-scangauge.109396/
2010 Toyota Prius Gear Tooth Counts
For those who loveto calculate gear ratios, here's some teeth counts for you.Power Split Sun Gear: 30Power SplitPinion Gear: 23Power Split Ring Gear: 78Motor Speed Reduction Sun Gear: 22Motor Speed Reduction Pinion Gear: 18Motor Speed Reduction Ring Gear: 58
MG2 speed reductionratio （Sun to Ring Gear）=58/22 =2.636
MG2 speed reduction ratio:2.636:1Counter Gear （replaces chain） Drive Gear Teeth: 54Couter Gear Driven Gear Teeth: 55Final Gear Drive Gear: 24Final Gear Driven Gear: 77
Final Drive Ratio=Final Gear ratio （77/24）X Counter Gear ratio （55/54） =3.267Total Final DriveRatio: 3.267:1
MG2 to wheel speed=MG2RPM / （3.267 X 2.636）=MG2 RPM / 8.612 X tire mile/revs
Example:58 mph（SGII） （60 displayed）=MG2 speed of 7000 RPM
7000 rev X 1 X mileX60 min =58.6 mph
min8.612 832 revhour
MG2 RPMX0.00837= MPH
MAX MG2 RPM=13500 RPM
MAX PRIUS SPEED=13500X 0.00837=113 MPH
MG1 MG2 Engine 的转速关系
MG1 = （ 18 / 5 ） * Engine - （ 143 / 145 ） * MG2MG2 = （ 145 / 143 ） * （ （ 18 / 5 ） * Engine - MG1 ）Engine = （ 5 / 18 ） * （ MG1 + （ 143 / 145 ） * MG2 ）Read more: http://priuschat.com/threads/mg1-mg2-rpms-scangauge.109396/#ixzz2UizabJiJ