EVS28 KINTEX, Korea, May 3-6, 2015 Parameter design of regenerative braking strategy and battery range of use of electric vehicle using the Optimization Technique Kiyoung Kim 1 , Seungwan Son 1 , Sukwon Cha 1 1 School of Mechanical & Aerospace Engineering, Seoul National University, Gwanak-ro 1, Gwanak-gu Seoul 151-744, Republic of Korea, [email protected]
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EVS28 KINTEX, Korea, May 3-6, 2015
Parameter design of regenerative
braking strategy and battery range of
use of electric vehicle using the
Optimization Technique
Kiyoung Kim1, Seungwan Son1 , Sukwon Cha1 1School of Mechanical & Aerospace Engineering, Seoul National
University, Gwanak-ro 1, Gwanak-gu Seoul 151-744, Republic of Korea,
1. Statistical method developed by Genichi Taguchi
3
• Optimization using steepest gradient method
known J= J(x1, …., xn)
• Optimization using Taguchi method
unknown SN= SN(x1, …., xn)
SN: signal-to-noise ratio
Objective and function parameter
I. Objective
1. Maximization of efficiency of electric vehicle regardless of various
using condition
II. Function parameter
1. efficiency of electric vehicle (km/kWh)
4
max y =𝑦1
𝑦1,𝑟𝑒𝑓
𝑦1
𝑦1,𝑟𝑒𝑓
: efficiency
: efficiency reference
Forward simulator
I. Analysis of efficiency by simulation program based on
MATLAB/Simulink
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Forward simulation program considering power train dynamics Simulation using component data map Determine traction power comparing vehicle speed with target speed
Design parameter
I. Initial SOC
II. SOC range of use
III. Ratio of front/rear hydraulic pressure based on vehicle
deceleration
Parameter combination in correlation
• Initial SOC & SOC range of use
6
Design parameter
I. Initial SOC
1. Different OCV and internal resistance for SOC
→ Different battery efficiency for SOC
→ To find optimal initial SOC
7
※SOC : State of Charge
=current charge amount
Maximum charge amount
Design parameter
II. SOC range of use
1. Different OCV and internal resistance for SOC
→ Different battery efficiency for SOC
→ To find optimal range of use
8
※SOC : State of Charge
=current charge amount
Maximum charge amount
Design parameter
I. Ratio of front/rear hydraulic pressure based on vehicle
deceleration
1. Total brake force = regenerative brake(motor) + mechanical brake(hybraulic)
2. Ideal brake distribution rate based on vehicle deceleration(blue line)
3. Real brake distribution rate only by mechanical brake (red line)
4. Regenerative braking makes up for deficient rear braking force
5. Meeting point ideal/real line as design parameter (green point)
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Rear b
rake fo
rce(N
)
Front brake force(N)
0.2g
0.4g
0.6g 0.8g
Ideal brake force distribution
Real brake force distribution
Rear b
rake fo
rce(N
)
Front brake force(N)
0.2g
0.4g
0.6g 0.8g
Ideal brake force distribution
Real brake force distribution
Product using condition
I. Driving propensity of driver
1. Indexing based on Aggressiveness factor
2. Aggressiveness factor?
1) Based on required traction power
2) Effect on efficiency according to driving pattern
can be quantified
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𝐴𝑔𝑔 = 𝑎 · 𝑣 +𝑑𝑡
𝑣𝑑𝑡
<Fuel economy of conventional car for aggresiveness> <various driving cycle>