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Determining Off-cycle Fuel Economy Benefits of 2-Layer HVAC Technology
Technical Paper
2018-01-1368
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This work presents a methodology to determine the off-cycle fuel economy benefit of a 2-Layer HVAC system which reduces ventilation and heat rejection losses of the heater core versus a vehicle using a standard system. Experimental dynamometer tests using EPA drive cycles over a broad range of ambient temperatures were conducted on a highly instrumented 2016 Lexus RX350 (3.5L, 8 speed automatic). These tests were conducted to measure differences in engine efficiency caused by changes in engine warmup due to the 2-Layer HVAC technology in use versus the technology being disabled (disabled equals fresh air-considered as the standard technology baseline). These experimental datasets were used to develop simplified response surface and lumped capacitance vehicle thermal models predictive of vehicle efficiency as a function of thermal state. These vehicle models were integrated into a database of measured on road testing and coupled with U.S. typical meteorological data to simulate vehicle efficiency across seasonal thermal and operational conditions for hundreds of thousands of drive cycles. Fuel economy benefits utilizing the 2-Layer HVAC technology are presented in addition to goodness of fit statistics of the modeling approach relative to the experimental test data.
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Authors
- Forrest Jehlik - Argonne National Laboratory
- Netsanet Chevers - Toyota Motor North America R&D
- Matthew Moniot - National Renewable Energy Laboratory
- Yuanpei Song - DENSO International America Inc
- Hidekazu Hirabayashi - Toyota Motor North America R&D
- Masahiro Nomura - DENSO International America Inc
- Eric Wood - National Renewable Energy Laboratory
Topic
Citation
Jehlik, F., Chevers, N., Moniot, M., Song, Y. et al., "Determining Off-cycle Fuel Economy Benefits of 2-Layer HVAC Technology," SAE Technical Paper 2018-01-1368, 2018, https://doi.org/10.4271/2018-01-1368.Data Sets - Support Documents
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