1/18 Early Stage Vehicle Concept Design with GT-SUITE Katsuya Minami Honda R&D Co., Ltd., Automotive R&D Center, Japan
Benefits of 1D-Simulation 2/18 How each component is operating during legislative and realworld driving cycles Objective measures for vehicle targets (e.g fuel consumption)
3/18 OUTLINE Motivation for concept design simulation Application to Early stage concept design Fuel consumption Hybrid configuration assessment Impact of component efficiency on CO2 Vehicle acceleration Component sizing Thermal management ICE powered vehicle Plug-in hybrid electric vehicle Conclusion and Future works
Motivation 4/18 Vehicle Targets Fuel Consumption Vehicle Acceleration Vehicle Dynamics System and Component Specification Conceptual Investigation using 1D simulation
Vehicle Targets Fuel Consumption Vehicle Acceleration Vehicle Dynamics Motivation 5/18 Virtual Assessment of System Configuration Powertrain architecture Hybrid Electric Vehicle Series, Parallel, S&P, P/S? ICE-powered Vehicle Engine/Transmission Thermal management strategy Effective utilization of thermo-control devices Integration of fluid circuits
6/18 Targets and Requirements for PHEV Target Fuel consumption Legislative driving cycle Real-world driving cycle Electric consumption Electric range => Combined fuel consumption Requirements Maximum vehicle speed Grade ability All electric or Combined operation in Charge-depleting(CD) mode Performance gap reduction between CD and Charge-sustaining (CS) mode Vehicle acceleration Vehicle dynamics
Fuel Consumption prediction 7/18 Data monitor Controller Engine Hybrid System Vehicle
FC on US City [mpg] エンジントルク [Nm] Engine Torque エンジントルク [Nm] Engine Torque BSFC of Engine Project WAPB Hybrid configuration assessment 8/18 Fuel consumption comparison between Series and Parallel type Same characteristics except for Hybrid configuration Fuel consumption on US driving cycle Series type Parallel type FC on US Highway [mpg] Engine operating points in US City cycle on BSFC Map Series type 140 400 120 380 100 360 340 80 320 60 6.1 300 280 40 260 20 220 0 500 1000 1500 2000 2500 3000 3500 200 4000 140 エンジン回転数 [rpm] 400 120 380 220 250 2Clutch Parallel type 100 80 60 40 20 220 250 350 400 450 300 350 400 450 270 300 270 0 500 1000 1500 2000 2500 3000 3500 4000 エンジン回転数 Engine Speed [rpm] 250 250 300 350 400 450 270 300 350 400 450 270 Minimum fuel consumption curve 360 340 320 300 280 260 220 200
Engine Peak Thermal Efficiency [%] Project WAPB Impact of component efficiency on CO2 emission Contribution of Engine and Tire characteristics on CO2 Emission for HEV 40 CO2 Emission 70 g/km 9/18 CO2 Emission 95 g/km 30 20 50 60 70 80 90 Tire Rolling Resistance Coefficient [10-4 ]
Vehicle Acceleration 10/18 Vehicle Traction controller Vehicle Transmission Engine
Motor Peak Power Project WAPB Sizing of Engine and Motor for Parallel HEV 11/18 0-60mph acceleration against Engine & Motor peak power 6.1 Constraint in CD mode Engine Peak Power
12/18 Thermal management for ICE-powered Vehicle Motivation Fuel consumption Powertrain quick warm-up On-demand operation Cabin Heating Modeled circuit Engine cooling (incl. cabin heater) Engine oil Transmission oil Charged air cooling EGR cooling Thermal model for D-segment vehicle Engine lubrication circuit Vehicle model AT oil circuit Engine model Engine cooling circuit Heat transfer model
Vehicle speed [kph] Project WAPB 13/18 Validity of thermal model in JC08 cold mode 5000 4000 Test Simulation 100 50 Fluid Temperature [degc] Engine speed [rpm] 3000 2000 1000 0 120 100 80 60 40 20 0 0 200 400 600 800 1000 1200 Time [sec] 0-50 -100-150 Engine coolant Engine oil Transmission oil
Improvement at Cold condition [%] Project WAPB Thermal management portfolio for JC08 14/18 FC combined 0.75 FC hot 0.25 FC cold Heat Storage system Engine Electrical Water pump Engine Oil warmer Transmission Oil warmer Plastic Engine oil pan Electrical Thermostat Improvement at Hot condition [%]
15/18 Thermal management for Plug-in HEV PHEV-specific issues 1 Many components to be thermo-controlled at different temperatures 2 Heat sources change depending on driving modes 3 Additional cabin-heater in CD mode significantly affects electric range Goal Minimum package size and energy consumption meeting thermo-control demand
16/18 GT model for Thermal management of PHEV Vehicle kinematic model Engine Cooling Engine lubrication Motor / Inverter cooling Battery cooling Air Conditioner
Conclusion and Future works 17/18 Early stage simulation contributes 1) Design vehicle architectures Powertrain configuration thermal management concept => Optimal solution meeting vehicle targets 2) Determine component specification precisely => reduce number of proto-types Future Work Real-World simulation Coupling with vehicle dynamics simulation Effective utilization of Environmental data
18/18 Thank you for your kind attention!