Browse Publications Technical Papers 2012-01-1025

The Power Performance and the Fuel Economy Estimation of HV for Vehicle Concept Planning Using VHDL-AMS Full Vehicle Simulation 2012-01-1025

In order to reduce CO₂, Electric Vehicles (EV) and Hybrid Vehicles (HV) are effective. Those types of vehicles have powertrains from conventional vehicles. Those new powertrains drastically improve their efficiency from conventional vehicles keeping the same or superior power performance. On the other hand, those vehicles have an issue for thermal energy shortage during warming up process. The thermal energy is very large, and seriously affects the fuel economy for HV and the mileage for EV.
In this paper, we propose VHDL-AMS multi-domain simulation technique for the estimation of the vehicle performance at the concept planning stage. The VHDL-AMS is IEEE and IEC standardized language, which supports not only multi-domain (physics) but also encryption. The common modeling language and encryption standard is indispensable for full-vehicle simulation.
By the VHDL-AMS modeling, the fuel economy, the effect of heat energy recovery from the exhaust gas, and the power performance are discussed for HV. The fuel economy was estimated using LA#4 driving pattern and the base simulation model validation result was that simulation was 22.0 km/L and measurement was 21.7 km/L (error 1.4%). The energy management using an exhaust gas heat exchange system realized 10.3% fuel consumption improvement during warming up. As for the power performance, the simulated acceleration time of 0-100 km/h was 11.12 sec and the measured vehicle time was 11.27 sec. The error between simulation and actual measurement result was 1.4%.
We showed that the application of VHDL-AMS multi-domain HV simulation is effective for the vehicle concept planning. Since the HV model uses embedded real control software, the VHDL-AMS modeling can be used as SIL at system control development stage.


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