TY - GEN
T1 - MODELING ANALYSIS ON COMBINED EFFECTS OF VVT/VCR ENGINE TECHNOLOGY TO REDUCE FUEL CONSUMPTION OF LIGHT-DUTY PARALLEL HYBRID CNG TRUCKS
AU - Sok, Ratnak
AU - Kusaka, Jin
AU - Nakashima, Hisaharu
AU - Minagata, Hidetaka
N1 - Funding Information:
This work received financial support from TOKYO GAS Co., Ltd. We thank HKS Co. Ltd for technical collaborations on engine specifications and measured performance maps.
Publisher Copyright:
Copyright © 2022 by ASME.
PY - 2022
Y1 - 2022
N2 - Potential fuel consumption (FC) improvements of a parallel hybrid, light-duty, compressed natural gas (CNG) truck are numerically predicted using the combined benefits of a variable valve timing (VVT) and variable compression ratio (VCR) engine. A CNG hybrid electric vehicle (CNG-HEV) simulation model is developed in commercial software based on conventional delivery trucks in the Japanese market. The hybrid powertrain model includes a pre-transmission e-motor, high voltage battery, and production-typed 3.0 L CNG engine. Power splitting between e-motor and engine is controlled by a rule-based control strategy. Under the JE05 drive-cycle, engine maps such as torque, fuel and flow rate, and engine friction were measured under different intake valve timings in the 4-cylinder, twin-turbocharged spark-ignition engine with customized pistons to reach a compression ratio (CR) of 17. For VCR operations, the performance maps were recorded under CR14, CR15, and CR17 using standard valve timings. Simulated FC of the CNG-HEV under the JE05 driving cycle is improved by 10.9% and 15.7% using standard and optimal intake valve timings, respectively, against a conventional powertrain vehicle. By combining optimal VVT/VCR engine operations with a selected battery sizing, the predicted FC of the CNG-HEV could be achieved up to 18.2% against the conventional powertrain.
AB - Potential fuel consumption (FC) improvements of a parallel hybrid, light-duty, compressed natural gas (CNG) truck are numerically predicted using the combined benefits of a variable valve timing (VVT) and variable compression ratio (VCR) engine. A CNG hybrid electric vehicle (CNG-HEV) simulation model is developed in commercial software based on conventional delivery trucks in the Japanese market. The hybrid powertrain model includes a pre-transmission e-motor, high voltage battery, and production-typed 3.0 L CNG engine. Power splitting between e-motor and engine is controlled by a rule-based control strategy. Under the JE05 drive-cycle, engine maps such as torque, fuel and flow rate, and engine friction were measured under different intake valve timings in the 4-cylinder, twin-turbocharged spark-ignition engine with customized pistons to reach a compression ratio (CR) of 17. For VCR operations, the performance maps were recorded under CR14, CR15, and CR17 using standard valve timings. Simulated FC of the CNG-HEV under the JE05 driving cycle is improved by 10.9% and 15.7% using standard and optimal intake valve timings, respectively, against a conventional powertrain vehicle. By combining optimal VVT/VCR engine operations with a selected battery sizing, the predicted FC of the CNG-HEV could be achieved up to 18.2% against the conventional powertrain.
KW - fuel economy
KW - hybridization
KW - natural gas engine
KW - variable compression ratio
KW - variable valve timing
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U2 - 10.1115/IMECE2022-96282
DO - 10.1115/IMECE2022-96282
M3 - Conference contribution
AN - SCOPUS:85148485963
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
BT - Energy
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2022 International Mechanical Engineering Congress and Exposition, IMECE 2022
Y2 - 30 October 2022 through 3 November 2022
ER -