Abstract
In recent years, increasing concerns regarding environmental pollution and requirements for lower fossil fuel consumption have increased interest in alternative hybrid powertrains. As a result, this paper presents a novel hydraulic/electric synergy powertrain with multiple working modes. The three energy sources (i.e., engine, battery, and hydraulic accumulator) in this configuration are regulated by a dual planetary gear set to achieve optimal performances. This paper selects the component sizes of a hybrid electric vehicle (HEV), a hydraulic hybrid vehicle (HHV), and a hydraulic/electric synergy vehicle (HESV), based on the dynamic performance of a target vehicle (TV). In addition, this paper develops the forward simulation models of the four aforementioned vehicles in the MATLAB/Simulink/Driveline platform, in which the fuel economy simulations are carried out in relation to the Chinese urban bus cycle. The simulation results show that the fuel consumption of the three hybrid vehicles is similar, but much better than, that of the TV. Finally, based on the operating cost calculations over a five-year working period, the lowest cost ranges of the three hybrid vehicles are determined, which provides a method for choosing the optimal hybrid scheme.
Highlights
With stricter regulations on fossil energy consumption and environmental pollution, the conventional internal combustion engine (ICE) should gradually exit from the automobile industry.Pure electric vehicles are ideal solutions, but they cannot completely replace the conventional vehicles in the short-term due to the limitation of battery technology
Hybrid electric vehicles (HEVs), which combine the merits of conventional vehicles and pure electric vehicles, have significant improvements in fuel consumption and emissions
For high-efficiency efficiency purposes, the output power of the engine is divided by the power distributor, a part of purposes, the output power of the engine is divided by the power distributor, a part of which is which is transmitted to drive the vehicle directly, and the remainder is converted into electric energy transmitted to drive the vehicle directly, and the remainder is converted into electric energy via the via the M/G and stored into the battery
Summary
With stricter regulations on fossil energy consumption and environmental pollution, the conventional internal combustion engine (ICE) should gradually exit from the automobile industry. In order to present a competitive performance, the novel hydraulic/electric synergy powertrain can work in one power-split mode and two parallel modes with a wide range for the transmission ratio. It will take the advantages of both hydraulic and electric hybrid powertrains. The configuration of the novel hydraulic/electric synergy powertrain is shown, consisting of three power sources (i.e., an engine, an electric motor/generator (M/G), and a hydraulic pump/motor (P/M)), and a double-planetary gear mechanism with three friction clutches and a. Kinds of parallel modes, and one power-split mode by engaging/disengaging the brake and clutches This powertraincan canclearly clearly present present more more flexible inin a better fuel.
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