Realization and optimization of high compression ratio engine with electromagnetic valve train

Fan, Xinyu; Chang, Siqin; Liu, Liang; Lu, Jiayu

doi:10.1016/j.applthermaleng.2016.10.039

Cited by 21 publications

(11 citation statements)

References 17 publications

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“…As a fully flexible engine valve train, the EMVT can adjust the air quality into each cylinder by adjusting the opening duration of the intake valve. In the EMVT developed by the task group, each valve is driven separately by the electromagnetic actuator, which can realize the full flexibility adjustment of valve lift, valve timing and valve movement [8][9][10]. The displacement curve of the performance test experiment of the electromagnetic actuated valve is shown in Fig.…”

Section: System Model 21 System Analysismentioning

confidence: 99%

Individual Cylinder Air-Fuel Ratio Estimation for a Gasoline Engine with Electromagnetic Valve Train

Chang

2018

MATEC Web Conf.

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For the multi cylinder gasoline engine, the consistency of each cylinder is an important index to affect the emission and the power. In this paper, in order to reduce the air-fuel ratio (A/F) maldistribution of the engine based on the electromagnetic valve train (EMVT), an individual cylinder A/F estimation algorithm is proposed for the individual cylinder A/F control. Based on the analysis of the hybrid and transfer models of the exhaust of each cylinder in steady state, an individual A/F observer is established by using Kalman filter algorithm. Then the unknown parameters in the observer are identified by the differential evolution(DE) algorithm. Only a single wide area exhaust oxygen(UEGO) sensor is needed to identify the unknown parameters and estimate the A/F of each cylinder. The combined simulation of GT-Power and Simulink validates the effectiveness of the proposed estimation approach. The results show that the proposed method can provide good estimation results under steady-state condition.

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Section: System Model 21 System Analysismentioning

confidence: 99%

Individual Cylinder Air-Fuel Ratio Estimation for a Gasoline Engine with Electromagnetic Valve Train

Chang

2018

MATEC Web Conf.

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“…Self-developed EMVT is a highly flexible camless valve train system that offers flexible variable valve timing, valve duration and valve lift [11,12], which provides a feasible approach to actualize skip fire strategy. It has been proved that EMVT has large potential for improving engine performances, such as charge motion control, variable compression ratio, as well as variable displacement [9,13,14]. Some of these attributes are unique to EMVT.…”

Section: Valve Strategy and Model Details 21 Valve Strategymentioning

confidence: 99%

Study on Valve Strategy and Fuel Benefits of Skip Fire Based on Electromagnetic Valve Train

Chang

2018

MATEC Web Conf.

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Cylinder deactivation (CDA) is a fuel consumption reduction technology for gasoline engines. Skip fire is a new type of CDA because the load and the density of firing cylinder are in proportion to the torque demand. However, it is difficult to realize because valves need to be switched between valve deactivation and normal operation stroke by stroke. The Electromagnetic valve train (EMVT) provides a fully flexible control method to achieve skip fire. In the paper, a new skip fire strategy based on electromagnetic intake valve train (EMIV) is proposed. Then, the oxygen concentration of the exhaust pipe, energy losses, in-cylinder pressure of the skipped cycle and exhaust gas recirculation (EGR) rate of the firing cycle are studied by the 1D simulation in GT-Power. The results shows the majority of gas sucked into the skipped cylinder is exhaust gas by reasonable control of IVO and IVC, and the exhaust oxygen-rich can be avoided. Meanwhile, EGR rate of the firing cylinder and energy losses of the skipped cylinder are maintained at lower level. At the conditions of 1200 and 1600 rpm, fuel economy has been improved respectively 8.1%-16.6% and 6.4%-14.6% when the brake mean effective pressure (BMEP) ranges from 0.4MPa to 0.2MPa.

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“…The results show that the EMVT can improve the intake charging of the engine significantly. Fan et al [6] realized the high compression ratio of the engine through EMVT. The results show that the thermal efficiency of the engine has an obvious improvement.…”

Section: Introductionmentioning

confidence: 99%

Design of an Electromagnetic Variable Valve Train with a Magnetorheological Buffer

et al. 2019

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In this paper, an electromagnetic variable valve train with a magnetorheological buffer (EMVT with MR buffer) is proposed. This system is mainly composed of an electromagnetic linear actuator (EMLA) and a magnetorheological buffer (MR buffer). The valves of an internal combustion engine are driven by the EMLA directly to open and close, which can adjust the valve lift and phase angle of the engine. At the same time, MR buffer can reduce the seat velocity of the valve and realize the seat buffer of the electromagnetic variable valve. In this paper, the overall design scheme of the system is proposed and the structure design, finite element simulation of the EMLA, and the MR buffer are carried out. The electromagnetic force characteristics of the EMLA and buffer force of the MR buffer are measured, and the seat buffering performance is verified as well. Experiments and simulation results show that the electromagnetic force of the EMLA can reach 320.3 N when the maximum coil current is 40 A. When the current of the buffer coil is 2.5 A and the piston’s motion frequency is 5 Hz, the buffering force can reach 35 N. At the same time, a soft landing can be realized when the valve is seated.

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Realization and optimization of high compression ratio engine with electromagnetic valve train

Cited by 21 publications

References 17 publications

Individual Cylinder Air-Fuel Ratio Estimation for a Gasoline Engine with Electromagnetic Valve Train

Individual Cylinder Air-Fuel Ratio Estimation for a Gasoline Engine with Electromagnetic Valve Train

Study on Valve Strategy and Fuel Benefits of Skip Fire Based on Electromagnetic Valve Train

Design of an Electromagnetic Variable Valve Train with a Magnetorheological Buffer

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