Fuzzy Logical Control Algorithm Based on Engine on/off State Switch for Hybrid Hydraulic Excavator

When the hybrid hydraulic excavator worked in a low load and high battery SOC value state, the maintenance of the engine working would cause unnecessary loss during energy conversion, therefore it was required to shut down the engine at this moment. Then a fuzzy logical control algorithm based on the engine on/off state switch was proposed for the hybrid hydraulic excavator. By comprehensively evaluated the current external load level, value of battery SOC and the duration of engine former state, the engine on-off state switch rules and trigger condition were established, also, parallel or pure electric driver system patterns was formed. By using MATLAB/Simulink to establish a dynamic mathematical model, the power system control performance and fuel consumption were analyzed after the application of the algorithm. The results showed that the fuzzy logic control algorithm had strong applicability for the external load changes, and the engine on/off state switch could reduce the redundancy of the energy conversion process, the machine fuel consumption when the excavator is in a low-load condition with high battery SOC.

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Experimental Study of EGR on Performance and Emissions of a Turbocharged DME Engine

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.886.257 ◽

2014 ◽

Vol 886 ◽

pp. 257-261

Author(s):

Jun Hua Wu ◽

Fu Shan Zuo ◽

Yong Hui Zhang

Keyword(s):

Experimental Study ◽

Fuel Consumption ◽

Substantial Reduction ◽

Load Condition ◽

High Load ◽

Reduction Of No ◽

Low Load ◽

Emission Behavior ◽

High Load Condition

This paper presents anexperimental study on reduction of NOx emission of a turbochargedengine fuelled with DME by means of EGR. Effects of EGR rate on engineefficiency and emission behavior was evaluated. The results show that the EGRcould be used as an effective way to reduce NOx emission. NOx isreduced almost linearly with increase of EGR rate. At low load condition, theNOx emission is reduced by 80% with 40% EGR rate without any economypenalty. At high load condition, the same substantial reduction of NOx couldbe achieved with only 20% EGR rate. While the HC and CO emissions are increasedwith increase of EGR rate. However, it is worth noting that EGR had a negativeeffect on fuel consumption at high load. Low EGR ratio should be taken at highengine load condition.

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Calculation and Analysis of the Interval Power Flow for Distributed Energy System Based on Affine Algorithm

Energies ◽

10.3390/en14030600 ◽

2021 ◽

Vol 14 (3) ◽

pp. 600

Author(s):

Bin Ouyang ◽

Lu Qu ◽

Qiyang Liu ◽

Baoye Tian ◽

Zhichang Yuan ◽

...

Keyword(s):

Power Flow ◽

Load Condition ◽

Energy Systems ◽

Energy System ◽

Optimal Operation ◽

Energy Utilization ◽

Utilization Rate ◽

Distributed Energy ◽

Low Load ◽

Distributed Energy System

Due to the coupling of different energy systems, optimization of different energy complementarities, and the realization of the highest overall energy utilization rate and environmental friendliness of the energy system, distributed energy system has become an important way to build a clean and low-carbon energy system. However, the complex topological structure of the system and too many coupling devices bring more uncertain factors to the system which the calculation of the interval power flow of distributed energy system becomes the key problem to be solved urgently. Affine power flow calculation is considered as an important solution to solve uncertain steady power flow problems. In this paper, the distributed energy system coupled with cold, heat, and electricity is taken as the research object, the influence of different uncertain factors such as photovoltaic and wind power output is comprehensively considered, and affine algorithm is adopted to calculate the system power flow of the distributed energy system under high and low load conditions. The results show that the system has larger operating space, more stable bus voltage and more flexible pipeline flow under low load condition than under high load condition. The calculation results of the interval power flow of distributed energy systems can provide theoretical basis and data support for the stability analysis and optimal operation of distributed energy systems.

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Performance Improvements in Cooker-Top Gas Burners for Small Aspect Ratio Changes

Journal of Thermal Science and Engineering Applications ◽

10.1115/1.4036362 ◽

2017 ◽

Vol 9 (4) ◽

Author(s):

Robson L. Silva ◽

Bruno V. Sant′Ana ◽

José R. Patelli ◽

Marcelo M. Vieira

Keyword(s):

Energy Conversion ◽

Fuel Consumption ◽

Conversion Efficiency ◽

Minimum Energy ◽

Energy Conversion Efficiency ◽

Energy Performance ◽

Operating Conditions ◽

Lower Fuel Consumption ◽

Performance Improvements ◽

Aspect Ratios

This paper aims to identify performance improvements in cooker-top gas burners for changes in its original geometry, with aspect ratios (ARs) ranging from 0.25 to 0.56 and from 0.28 to 0.64. It operates on liquefied petroleum gas (LPG) and five thermal power (TP) levels. Considering the large number of cooker-top burners currently being used, even slight improvements in thermal performance resulting from a better design and recommended operating condition will lead to a significant reduction of energy consumption and costs. Appropriate instrumentation was used to carry out the measurements and methodology applied was based on regulations from INMETRO (CONPET program for energy conversion efficiency in cook top and kilns), ABNT (Brazilian Technical Standards Normative) and ANP—National Agency of Petroleum, Natural Gas (NG) and Biofuels. The results allow subsidizing recommendations to minimum energy performance standards (MEPS) for residential use, providing also higher energy conversion efficiency and/or lower fuel consumption. Main conclusions are: (i) Smaller aspect ratios result in the same heating capacity and higher efficiency; (ii) higher aspect ratios (original burners) are fuel consuming and inefficient; (iii) operating conditions set on intermediate are lower fuel consumption without significant differences in temperature increases; (iv) Reynolds number lower than 500 provides higher efficiencies.

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