Computational studies of the influence of variable valve timing on the performance of a gas engine with Miller’s thermodynamic cycle

Milov, K. V.

doi:10.1088/1742-6596/2061/1/012066

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…The other is to change the installation angle of the intake cam to achieve the purpose of the overlap angle of the variable valve. The opening and closing time of the intake valve will change at the same time, which is called the overlap angle of the variable valve [25][26][27]. Figure 1 below shows the comparison between the Miller cycle and the conventional diesel engine cycle indicator diagram, and further explains the reason why the Miller cycle reduces NO X emission.…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison and Optimization of 16V265H Diesel Engine Fueled with Biodiesel Based on Miller Cycle

Jiang

Zhou

et al. 2022

Processes

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This paper introduces the theoretical basis and optimization method of diesel engine working process theory. By comparing two Miller cycle schemes of B20 biodiesel under different load conditions of 1000 rpm (100%, 75%, and 50%), the best Miller cycle scheme and the best Miller degree were found. Then, based on the Miller cycle scheme, its performance was optimized and analyzed, and the best intake timing scheme of the B20 biodiesel engine under different working conditions was obtained. The results show that the performance of B20 biodiesel in variable valve overlap angle Miller cycle is better than that in variable cam profile Miller cycle, and the effect is the best when the Miller degree is 30 °CA. When B20 biodiesel is used under 100% and 50% load conditions, the maximum power under the two loads is in the area near intake valve timing 179 °CAA and exhaust valve timing 174 °CAA, and intake valve timing 224.5 °CAA and exhaust valve timing 119 °CAA, respectively. Fuel consumption, soot emissions, and NOx emissions also have the corresponding best performance intake valve and exhaust valve positions.

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Section: Introductionmentioning

confidence: 99%

Performance Comparison and Optimization of 16V265H Diesel Engine Fueled with Biodiesel Based on Miller Cycle

Jiang

Zhou

et al. 2022

Processes

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Study on the soft-landing of large inertia valve based on multi-objective optimization of annular gap

Zhou,

He,

Miao

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part C:

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Variable valve mechanism and its technology are widely used in vehicle diesel engines. As a critical component, the performance of reciprocating actuator is the guarantee for the realization of electro-hydraulic variable valve. In order to solve the problem of high setting speed in electro-hydraulic camless variable valve system, a variable valve actuator based on annular gap buffer is proposed and optimized to realize quick closing and soft landing. The experimental results show that the actuator can achieve the purpose of setting buffer, and the setting speed is 0.5 m/s with 15 ms of closing time. AMESim is used to build the system simulation model and calibrated by experiments. The simulated lift curve is close to the experimental curve, and its Pearson coefficient is 0.9995. The influence of structural parameters on the system driving ability and buffering effect is studied through the model. According to the simulation results, the annular gap eccentricity will affect the buffering effect. When the eccentricity increases from 0.005 to 0.035 mm, the landing velocity increases by 0.1 m/s and the valve closing time decreases by 0.9 ms. NSGA-II method is used to optimize the structural parameters of the annular gap, and an obvious Pareto front is obtained and the optimal solution is applied in next experiments. The landing speed is reduced from 0.5 to 0.25 m/s, and the landing time is still less than 15 ms. This paper provides a simple cushioning scheme for electro-hydraulic camless variable valve soft landing which is independent of proportional valve.

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Computational studies of the influence of variable valve timing on the performance of a gas engine with Miller’s thermodynamic cycle

Cited by 2 publications

References 4 publications

Performance Comparison and Optimization of 16V265H Diesel Engine Fueled with Biodiesel Based on Miller Cycle

Performance Comparison and Optimization of 16V265H Diesel Engine Fueled with Biodiesel Based on Miller Cycle

Study on the soft-landing of large inertia valve based on multi-objective optimization of annular gap

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