Test Data


Test Data
Test Data
Test purpose
- Bygen NHC 6AT(6 auto transmission) performance test
Test item
- Dynamic performance test(Top speed, Acceleration, Gradeability)
- Road test
Test method
- Vehicle : Single-speed EV('D' company product), 6 speed EV(customizing NHC 6AT to 'D' company product)
- Condition : For having the same test conditions, we adjust the curb weights of two test vehicles of "single-speed" Model and "NHC 6AT" to be
   106kg and use the same battery.
2W EV(Single-speed)   Vs    2W EV(with NHC 6AT)    Performance test
Test Vehicle
2W EV(Single-speed)
2W EV(with NHC 6AT)
Model 2W EV(Single-speed ) 2W EV(with NHC 6AT)
Motor Max 3.6kW Max 4.5kW (Rated 3.0kW)
Battery 2.37kWh(Lithium ion) 2.37kWh(Same as single-speed)
Wheelbase 1,305mm 1,350mm
Rear wheel 3.5-10 51J 100/80-12”
Curb weight 106kg 106kg
Transmission Reducer(single-speed) 6 auto, shift ratio 400%
1st 3.000:1,   2nd 2.235:1,   3rd 1.684:1,
4th 1.286:1,   5th 0.957:1,     6th 0.750:1
※ For having the same test conditions, we adjust the curb weights of two test vehicles of "single-speed" Model and "NHC 6AT" to be
      106kg and use the same battery.
NHC 6AT Effect
Performance test
● Date : June 12, 2020
● Test at dynamometer
◎ Top speed
Item 2W EV(Single-speed) 2W EV(with NHC 6AT)
Speed within 0 ~ 400m 64.1km/h 77.6km/h
◎ Acceleration
Item 2W EV(Single-speed) 2W EV(with NHC 6AT)
Time to 0~50km/h 8.7 seconds 5.6 seconds
◎ Gradeability
Item 2W EV(Single-speed) 2W EV(with NHC 6AT)
test times [%] [%]
After velocity is stabilized at 5km/h, average grade of last 10m after 50m driving is recorded. 1 27.4 (15.3°) 56.8 (29.6°)
2 20.4 (11.5°) 57.1 (29.7°)
3 18.0 (10.2°) 57.0 (29.6°)
▶ Gradeability of single-speed EV 2W is radically decreasing during the continuous hill drive due to overheat,
       While EV 2W with NHC 6AT keeps the almost same gradeability.
※ All other dynamic performances such as top speed and acceleration of single-speed EV2W drop owing to overheat.
• Test conditions are equalized with the same model and the same vehicle weight (adjusted at 106kg).
• Motor of NHC 6At is manually made for a prototype.
Pilot product would be 30% less weight and size than prototype with
   increasing stability and efficiency, the motor supplier said.
• Without final shaving and sophisticated design of gears, there are noise at rotating.
At the pilot stage, all problems should be eliminated with precise design and stat-of-the-art manufacturing technology.
• All performances including top speed, acceleration and gradeability should increase with pilot design and production technology
Road tests
● Period : June 6 to 7, 2020
● Venue : Circle drive (10km for one circle) at Dongil-ro Nowon-gu, Seoul , S.Korea (hold raw data)
● Equalizing test conditions : Gross weight 106kg, Lithium ion Battery (2.37kWh)
◎ Road test
Model Avg. Speed Driving Effi.(km/kWh) Remarks
2W EV(Single-speed) 27.1km/h 58.7km 24.8 Efficiency improved by over 30% despite superior dynamic
• Considering the higher motor output, the lower efficiency,
   we can expect efficiency will increase over 50% if we use the
   same motor output
※The hypothesis above will be tested sooner or later.
2W EV(with NHC 6AT) 27.4km/h 78.9km 33.3
Current consumption graph
• Single-speed Zappy continuously hit the max 60 ampere at the max output of 3.6KW, as shown in the left-side graph,
  which means it could not make sufficient acceleration with using max limited current on the road.
• As shown on the right-side graph, NHC 6AT provides wide range of torque and rpm, which makes the motor rotate at the rated rpm
   range at any velocity where it shows the most efficient energy consumption
. At the start, it consumes less energy using lower gear
   with the strongest torque
Running within the rated rpm using 6 speed gear shift does not create overheat, which contributes to higher efficiency rate
◎ Road test place