Research on a pneumatic hybrid engine with regenerative braking and compressed-air-assisted cranking

Wang, Lei; Li, Daofei; Xu, Hang; Fan, Zhipeng; Dou, Wenbo; Yu, Xiaoli

doi:10.1177/0954407015586706

Cited by 11 publications

(7 citation statements)

References 21 publications

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“…It is a simplified type-I RV mechanism with a vane slot cut into the cylinder in replacement of the bush component. 3 12.0…”

Section: Methodsmentioning

confidence: 99%

“…Compressed air can be used to power pneumatic engines, otherwise known as air expanders, and essentially function as a clean energy source. It requires no electrical power input and has been proposed as an alternative power source for hybrid vehicles in which it is employed in conjunction with an internal combustion engine, replacing the electric motor in conventional hybrid vehicles [1][2][3]. Such hybrids can improve thermal efficiency by utilizing waste heat from the engine and extending the operating range of such vehicles when compared to electrical hybrids [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Torque Characteristics of the Revolving Vane Air Expander

Subiantoro

Ooi

2020

Machines

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The use of compressed air as an alternative source of clean energy requires an air expander to extract work. A new design, known as the revolving vane mechanism, has been proposed in an effort to develop high efficiency rotary machines. This paper provides an in-depth analysis by including the vibration characteristics of the revolving vane air expander to evaluate the steady-state operating output torque. A generic model for describing the revolving vane rotational vibration is first derived and subsequently modified to describe the prototype tested. Measurements show that the output torque is bimodal; arising from a tolerance gap between the vane and its slot during fabrication. This effect was found to be less pronounced at high operating speeds. The model is found to be in good agreement with the measured output torques. Further analysis with the validated model showed that extracting shaft work from the cylinder would result in better performance.

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“…It is a simplified type-I RV mechanism with a vane slot cut into the cylinder in replacement of the bush component. 3 12.0…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Torque Characteristics of the Revolving Vane Air Expander

Subiantoro

Ooi

2020

Machines

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“…An air injection boosting system is installed on a 6-cylinder diesel engine. The air tank is used to store the compressed air generated from recovering the engine brake energy as described in the previous work [40]. During the regeneration of engine brake energy, the engine is operated as an air compressor, generating compressed air and pump to the air tank through the pipe shown as the red line in Fig.…”

Section: Description Of the Hybrid Pneumatic Combustion Enginementioning

confidence: 99%

“…The simulation showed that the fuel mass consumed during the NEDC cycle was 677 g for a standard vehicle and 631.2 g for a hybrid pneumatic vehicle, indicating a fuel saving effect of 6.8%. Wang et al [26] conducted the simulation study of a hybrid pneumatic engine under urban driving-cycle, showing that the fuel consumption of a light-duty vehicle equipped with a hybrid pneumatic engine can be reduced by 8%. In addition to those mentioned above, a few numerical studies were also reported on the fuel-saving effect of hybrid pneumatic engine in different 5 applications [27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Study of a hybrid pneumatic-combustion engine under steady-state and transient conditions for transport application

Fang

et al. 2019

International Journal of Engine Research

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In this study, a new form of hybrid pneumatic combustion engine based on compressed air injection boosting is proposed. The hybrid pneumatic combustion engine regenerates the wasted energy during engine brake to improve the engine performance achieving better fuel economy. The mathematic model of the hybrid pneumatic combustion engine including a supercharged engine and the compressed air tank has been established. The steady-state and transient performance of the engine are analysed. Results show that the air injection boosting system can effectively improve the steady-state performance. Under the speed of 1900 r/min and 100% load, the engine torque and power can be increased from 1039 N m, 206.9 kW to 1057 N m, 210 kW by adopting air injection boosting with the injection pressure of 0.5 MPa. Effects of air injection parameters are also studied, showing that better performance can be achieved under higher air tank pressure and larger injection hole diameter. In addition, a transient analysis is completed under the speed of 1100 r/min. The result shows that when air injection boosting is used, the responding time of the engine to an instant load increase can be potentially reduced from 5.5 to 3.5 s under the injection pressure and duration of 0.5 MPa and 3 s. Meanwhile, the tank pressure has limited influence on the transient performance of the engine.

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“…Results showed that the fuel economy generated by HPE was 10%~26% under different wind power conditions. Wang et al [27] conducted a simulation study on a HPE to regenerate the braking energy and urban driving-cycle simulation results pointed out the fuel consumption of a light-duty vehicle with pneumatic hybrid system can be reduced by 8 %. A two-stage expansion air engine, which includes one small and one large cylinder to conduct two-stage in series has been proposed and investigated by Liu et al [28].…”

Section: Introductionmentioning

confidence: 99%