A comparative study on the energy flow of a conventional gasoline-powered vehicle and a new dual clutch parallel-series plug-in hybrid electric vehicle under NEDC. (15th August 2020)

• Record Type: Journal Article
• Authors: Dong, Hao; Fu, Jianqin; Zhao, Zhichao; Liu, Qi; Li, Yangyang; Liu, Jingping
• Is Part Of: Energy conversion and management. Volume 218(2020)
• Publication Date: 2020-08-15
• Subjects: ABS antilock brake system -- AMT automatic mechanical transmission -- AT automatic transmission -- BMEP brake mean effective pressure -- BSFC brake specific fuel consumption -- CA crank angle -- CAN controller area network -- CD charge depletion -- CS charge sustenance -- CVT continuously variable transmissions -- DC/DC direct current/ direct current converter -- DCT double-clutch transmission -- ECU electronic control unit -- ESS energy storage system -- EV electric vehicle -- FCV fuel cell vehicle -- FMEP friction mean effective pressure -- FPEG free-piston engine generator -- HEV hybrid electric vehicle -- HVAC heating ventilation air conditioning -- ICE internal combustion engine -- ICEV internal combustion engine vehicle -- IMEP indicated mean effective pressure -- i-MMD intelligent multi-mode drive -- ISG integrated starter/generator -- MT manual transmission -- NEDC new European driving cycle -- NEV new energy vehicle -- PEB power electronics box -- PHEV plug-in hybrid electric vehicle -- PMEP pumping mean effective pressure -- PMSM permanent magnet synchronous motor -- SOC state of charge -- TET test end time -- TGDI turbocharged gasoline direct injection -- TM traction motor -- TST test start time -- VCR variable compression ratio -- VIS variable intake system -- VVL variable valve lift -- VVT variable valve timing -- WLTC world-wide harmonized light duty test cycle; Turbocharged engine -- Vehicle test -- Energy flow -- PHEV -- Parallel-series hybrid -- NEDC; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2020.113019
• Languages: English
• ISSNs: 0196-8904

Abstract

Graphical abstract: Highlights: Energy flow tests for PHEV and ICEV were conducted under NEDC. ICEV with turbocharged engine overcharges in non-supercharging conditions. PHEV achieves decoupling of engine speed and torque while tank-to-wheel efficiency increases little. Brake energy regeneration contributes most to energy saving. The energy-saving rates of idling, braking and driving conditions are quantified. Abstract: Energy flow analysis is an effective tool for refined development of vehicle to improve its energy efficiency. To reveal the energy-saving principles of hybrid vehicle, a plug-in hybrid electric vehicle (PHEV) which is in charge sustenance phase and a conventional vehicle with the same internal combustion engine (ICE) are selected to conduct energy flow test under New European Driving Cycle (NEDC) of cold start and warm start. Various energy distributions are quantified, the differences are compared, and the influencing factors are analyzed. Research results show that the conventional vehicle with turbocharged engine overcharges in non-supercharging conditions, and this phenomenon could be alleviated in hybrid vehicle. Tested PHEV could reduce the working range of engine to a certain extent through the electrification of powertrain, but the tank-to-wheel efficiency increases little. This indicates that the design purpose of powertrain topology is to ensure that the benefits of improved engine thermal efficiency outweigh the losses caused by longer energy transmission paths. Brake energy regeneration could reduce the demand for effective engine output, which contributes the most to energy saving, so the braking energy should be recovered as much as possible on the premise of safety and driving comfort. The proportion of exhaust gas enthalpy-increase for the tested PHEV is relatively high, and the use of exhaust waste heat recovery technology can further improve its energy efficiency. Compared with tested conventional vehicle, the energy-saving contribution rates of tested PHEV under NEDC are 5% for idling condition, 20% for braking condition, and −5% for driving condition, respectively. These provide guidance for further tapping the potential of hybrid vehicles.