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World-first Compact 6 gears auto transmission for evs

Transmission ‘Should-be-used’ in EV
BYGEN NHC 6AT
: Advantages
: Competitiveness
: Design & Connecting
Competitiveness of NHC 6AT
No Hydraulic & Clutch 6Gears Auto Transmission
Transmission effects
Efficiency(km/kWh) increases by over 50%
compared to the same output performances (Refer to Test Data)
Battery usage: “60kWh
40kWh

▶ Significant cost-cut
   • Over 50% efficiency improvement
1/3 smaller battery
       (from 60kWh to 40kWh)
   • No overheat
No need of cooling systems
   • No high frequency noise
No cost for preventing noise
   • 50% Cost reduction of core powertrain (PCU + Motor + Transmission)
Auto Transmission in EV
▶ EV industry has made continuous efforts to reduce production cost by increasing driving efficiency such as increasing energy density,
      decreasing weight of vehicle and increasing motor/inverter efficiency. Nowadays, auto transmission emerges as the most powerful solution
      for increasing driving range for EV
.
▶ Porsche adopted two speed auto transmission for new Taycan. Ford and KYMCO (Chinese Taipei, EV2W) introduced 6-speed manual
      transmission for their vehicles.
      • Compact sized auto transmission to satisfy preconditions for EV has not been developed so far in EV industry.
Multi-speed transmission to provide higher efficiency will be the key for EV competitiveness.
NHC 6AT will be game changer of EV.
      ※ EU decided stiffer penalties for ICE vehicles from 2021.
New ICE production is not permitted soonest.
In-house PCU Development
PCU(Powertrain Control Unit)
     
MCU(Motor Control Unit) + TCU(Transmission Control Unit)
















▶ Sophisticated and state-of-the-art TCU is developed by in-house technology to make “Zero Shift Time-lag”.
      Independent and core powertrain (PCU+Motor+Transmission) system is constructed.
Competitive Edge of NHC 6AT
Performance effect
Efficiency (km/kWh) improved by 50% comparing to same spec (refer test report)
Battery capacity from 60kWh to 40kWh
Production cost is radically cut.

Mass production
▶ Total parts are reduced 1/10 than conventional transmission, which is easy to be assembled.
      • Compact design and less parts to delete hydraulic (or other substitutes), clutches (torque converter), satellite gears, ring gear and
      hydraulics-controlled parts. multi-plate clutched, brake, valve bod, etc.

Mounting
▶ Mounted on chassis without current EV platform change
      • Total size combined motor and transmission is smaller and lighter than conventional transmission including reducer.
▶ NHC 6AT is to be mounted on ICE.
      • Efficiency will increase by over 10%. Production costs and weight will decrease by over 70%.
      • Gear is automatically transferred to neutral when vehicle speed is under constant speed (about 5km/h) at brake “ON” mode.
     
At brake “OFF” mode, it is automatically transferred to first gear.
      • It could be applied to heavy-duty EV2W as well as EV4W
     
Exclusive compact sized auto transmission for heavy-duty EV2W

COST
With Bygen’s innovation, it radically cut production costs as well as efficiency improvement.
▶ Unique and exclusive solution to apparently cut EV Cost.
AS-IS vs. TO-BE
Based on EV4W (as for EV2W, Refer to Test Data)
Items Single Speed EV
(AS-IS)
NHC 6AT EV
(TO-BE)
Remarks
Energy Efficiency - Improved by about 50% 1/3 battery capacity
(60kWh
40kWh)
Driving System Motor controls vehicle speed Transmission controls torque and rpm at rated range
Cooling System Cooling system indispensable
(water/fluid system)
No need of cooling system Motor does not produce high temperature,
if it runs in the rated range
Motor IPMSM (AC) IPMDC(BLDC) Motor
IPMSM Motor
IPMSM is same as BLDC
Control System Expensive inverter to use FOC PCU(Powertrain Control Unit)
MCU(Motor Control Unit) +
TCU(Transmission Control Unit)
Size and price of the PCU are 50% of Those of the inverter
Transmission Size Reducer (Single speed) Size for sub-compact car is under Ø200mm.
Total weight is less than 15kg.
Total size of motor and transmission is smaller than conventional motor and reducer
Durability No torque interruption to decide durability All parts are not heavily loaded during shifting.
Little chance of repairing and defaults.
(see video in the website)
Curb Weight Smaller battery, No cooling system, etc.
Torque/RPM Range Narrow & Limited Wider by gear ratios 6 gears transmission provides a seamless shift and wide range of
torque and RPM
Powertrain Costs
(PCU+Motor+Trans)
Expensive inverter & High power motor Overall powertrain cost including transmission is cheaper than that of single speed EVs • PCU cost is one-third of inverter
• Smaller motor w/o cooling systems
• T/M material cost: around $100~200
Vehicle Price • Large battery
Cost burden
• Cooling system in inverter and    motor
• High frequency noise
• Expensive powertrain
• 1/3 battery enough for the same    range
• No need of cooling system
• No cost for preventing high    frequency noise
• Reduction of core powertrain    expenses
Lowering EV price to compete with ICE