A Novel Design of Pneumatic Actuator for Camless Engines

Venkatesh, D.; Selvakumar, A. Arockia

doi:10.4271/2016-01-0099

Cited by 5 publications

(2 citation statements)

References 17 publications

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“…When a vehicle is cruising at a low and constant speed, it does not require all cylinders to be operational. A significant amount of research has been conducted to demonstrate the advantage of variable valve actuation for camless engines over the traditional cam-based valve train of both gasoline and diesel engines [ 5 , 6 , 7 ]. Variable valve actuation (i.e., VVA) or variable valve timing (i.e., VVT) and variable valve lift (i.e., VVL) can be achieved with both electro-mechanical actuators and electro-hydraulic actuators.…”

Section: Introductionmentioning

confidence: 99%

“…Variable valve actuation (i.e., VVA) or variable valve timing (i.e., VVT) and variable valve lift (i.e., VVL) can be achieved with both electro-mechanical actuators and electro-hydraulic actuators. In [ 7 ], new design of camless engines with pneumatic actuator was proposed and its performance was validated from various test results at different engine speeds. Also, an extensive research on the sensors has been carried out to identify the crankshaft position.…”

Section: Introductionmentioning

confidence: 99%

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Design and Performance Evaluation of an Electro-Hydraulic Camless Engine Valve Actuator for Future Vehicle Applications

Nam

Cho

Park

et al. 2017

Sensors

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This paper details the new design and dynamic simulation of an electro-hydraulic camless engine valve actuator (EH-CEVA) and experimental verification with lift position sensors. In general, camless engine technologies have been known for improving fuel efficiency, enhancing power output, and reducing emissions of internal combustion engines. Electro-hydraulic valve actuators are used to eliminate the camshaft of an existing internal combustion engines and used to control the valve timing and valve duration independently. This paper presents novel electro-hydraulic actuator design, dynamic simulations, and analysis based on design specifications required to satisfy the operation performances. An EH-CEVA has initially been designed and modeled by means of a powerful hydraulic simulation software, AMESim, which is useful for the dynamic simulations and analysis of hydraulic systems. Fundamental functions and performances of the EH-CEVA have been validated through comparisons with experimental results obtained in a prototype test bench.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design and Performance Evaluation of an Electro-Hydraulic Camless Engine Valve Actuator for Future Vehicle Applications

Nam

Cho

Park

et al. 2017

Sensors

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Valve timing optimisation of a spark ignition engine with skip cycle strategy

Dogru

Lot

Dinesh

2018

Energy Conversion and Management

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Skip cycle strategy (SCS) is a stroke volume modulation method leading to reduction in pumping loss through deactivation of engine valves under part-load conditions. Although SCS achieves a significant fuel economy, it increases regulated pollutant emissions such as nitrogen oxide and unburned hydrocarbon in comparison to normal 4-cycle engine operation. This paper investigated normal cycle strategy, skip cycle strategy as well as combination of skip cycle strategy and variable valve timing strategy for a spark-ignition engine using one-dimensional numerical model. The skip cycle engine was modelled at several steadystate operation points and then optimised at best ignition timing providing maximum brake torque at each simulation case. The numerical results obtained for both normal cycle and skip cycle have been validated against the experimental data. After completing the validation of numerical results with engine test bench data for both normal and skip cycle operations, optimisation of intake and exhaust valve timing profiles have been carried out regarding advancing or retarding camshaft relatively to the crankshaft position. In case of SCS and variable valve timing application together, NOx concentration was reduced by 35.1%, 39.4%, 26.8% and HC emission was reduced by 54.9%, 49.3% and 47.4% on average for brake mean effective pressure load levels of 1, 2 and 3 bar respectively at all among engine speed ranges between 1200 and 1800 rpm compared to stand alone SCS strategy. Furthermore, no remarkable additional brake specific fuel consumption was observed for SCS plus variable valve timing strategy compared to stand alone SCS.

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Multi-input model predictive speed control of lean-burn natural gas engine in range-extended electric vehicles

Xiong

Gong

et al. 2022

Energy

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A Novel Design of Pneumatic Actuator for Camless Engines

Cited by 5 publications

References 17 publications

Design and Performance Evaluation of an Electro-Hydraulic Camless Engine Valve Actuator for Future Vehicle Applications

Design and Performance Evaluation of an Electro-Hydraulic Camless Engine Valve Actuator for Future Vehicle Applications

Valve timing optimisation of a spark ignition engine with skip cycle strategy

Multi-input model predictive speed control of lean-burn natural gas engine in range-extended electric vehicles

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