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ECEN5017 Lecture 5CU‐Boulder Announcements
• HW1 due 9am MDT, Monday, Sep. 9– Submit a single, easily readable pdf file via D2L– Late work will receive no credit– Collaboration is encouraged; use blog
• Short tutorial on MATLAB/Simulink posted on the CAETE site with other recorded lectures
• HW2 will include Simulink model simulations
1
Please disregard USU‐specific announcements in lectures recorded by Prof. Zane at USU
Today• Consider impact of vehicle component efficiency• Develop component & system simulation models
2
EV drivetrain components
3
ElectricMotor Transmission
wheels(radius rw)
ne
Te
nvTv
Fv v
3-phaseInverter
DC-DCConverter
BatteryPack
BatteryCharger
Electric Drive
Pbatt PDC
IaIb
Ic
Tv: Torque at the wheelnv: wheel rotational speed [rpm]rw = rv: Wheel radius
Parameter Review
4
v: vehicle velocity (speed)Fv: Vehicle tractive forceTv: Torque at the wheelnv: wheel rotational speed [rpm]ωv: wheel angular speed [rad/sec]Pv: Vehicle tractive power
Mv: vehicle massrw = rv: Wheel radiusCr: Rolling resistance coefficientCd: Aerodynamic drag coefficientAv: Vehicle front areaair density
Vehicle / wheel level parameters
gratio: gear ratione: motor rotational speed [rpm]ωe: motor angular speed [rad/sec]Te: motor/engine torque [Nm]Ke: Torque constantPe_max: Maximum motor powerTe_max: Maximum motor torquevb: Base speed, torque/power limit boundaryx: motor speed factor, ratio vmax / vbta: time spec to accelerate to speed vfm: motor efficiency
Motor / engine parameters
Component Efficiency
5
ElectricMotor Transmission
wheels(radius rw)
ne
Te
nvTv
Fv v
3-phaseInverter
DC-DCConverter
BatteryPack
BatteryCharger
Electric Drive
Pbatt PDC
IaIb
Ic
Electric Motor Efficiency
7
Evaluation of 2004 Toyota Prius Hybrid Electric Drive System(2005 report by Oak Ridge National Lab)
DC‐DC Converter Efficiency
9
Evaluation of 2004 Toyota Prius Hybrid Electric Drive System(2005 report by Oak Ridge National Lab)
Drive Train Model
14
ElectricMotor Transmission
wheels(radius rw)
ne
Te
nvTv
Fv v
3-phaseInverter
DC-DCConverter
BatteryPack
BatteryCharger
Electric Drive
Pbatt PDC
IaIb
Ic