Development of an Air/Fuel Ratio Control System for Lean Burn Gas Engines

Nakagawa, Kenji; Okamoto, Kazuhisa; Shoji, Fujio

doi:10.4271/942041

Cited by 5 publications

(5 citation statements)

References 1 publication

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“…For the same thermal efficiency and air-fuel ratio, lean-burn natural-gas engines emit less CO 2 than diesel engines do; and the CO 2 emissions of natural-gas engines are 20% lower than those of gasoline engines of the same power [22]. Moreover, lean-burn natural-gas engines have lower NO x emissions under heavy load [23]. The statistical results by Khan et al [24] indicate that CO 2 and other hazardous emissions can be reduced markedly when natural gas is employed as an alternative fuel, compared with diesel and gasoline.…”

Section: Requirements and Challenges For Future Development Of An Autmentioning

confidence: 99%

$$\hbox {CO}_{2}$$ CO 2 Reduction Request and Future High-Efficiency Zero-Emission Argon Power Cycle Engine

Gong

Deng

et al. 2018

Automot. Innov.

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To meet the requirements of strict fuel consumption and emission limits, continuously increasing the thermal efficiency of an internal combustion engine and decreasing its exhaust emissions are the main challenges to its sustainable development within the automotive industry. Considering the competition with other zero-emission powertrain systems, such as vehicle batteries and fuel cells, the development of the internal combustion engine needs to focus on producing higher efficiency and zero emissions to meet the request of CO 2 reduction. This paper introduces two novel concepts for an internal combustion engine featuring high efficiency and zero emissions. Referred to as the argon power cycle engine fueled with either hydrogen or natural gas within an oxygen-argon mixture, its fundamentals and characteristics are expounded. This includes a method necessary to absorb carbon dioxide when natural gas is used as fuel instead of hydrogen.

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Section: Requirements and Challenges For Future Development Of An Autmentioning

confidence: 99%

$$\hbox {CO}_{2}$$ CO 2 Reduction Request and Future High-Efficiency Zero-Emission Argon Power Cycle Engine

Gong

Deng

et al. 2018

Automot. Innov.

View full text Add to dashboard Cite

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“…Coefficients ai are mainly influenced by engine load, crankshaft speed, ignition advance angle and air/fuel ratio, so we can assume a1 =fa(PIM, )o,;Adv) (2)(3)(4)(5). Where PIM is the manifold pressure, a) is the crankshaft angle speed, 2 is the equivalent air/fuel ratio coefficient, Adv is the ignition advance angle.…”

Section: Introductionmentioning

confidence: 99%

“…This is functional map of ai when the 2 is 1gimit. (2)(3)(4)(5)(6) and (2-7) denote open loop off-line estimations of ai . During the engine operating process, ai must be adapted in real time based on the engine speed ( Ne ) and the engine load ( Load ), the adaptation algorithm is shown in (2)(3)(4)(5)(6)(7)(8).…”

Section: Introductionmentioning

confidence: 99%

“…Then the indicated torque T can be estimated using (2-1). Whereas, the indicated torque which is determined using (2)(3)(4) only for one specific case as well as each engine operating condition. However, in actual engine operation, these conditions (engine speed and load) are continuously changing.…”

Section: Introductionmentioning

confidence: 99%

“…ai are tuned by minimizing the least mean squares error between the trained values atrained and the estimated values aestimateThe error is defined by(2)(3)(4)(5)(6)(7)(8)(9).…”

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confidence: 99%

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The Lean Burn Control for LPG Engine Using Torque Estimation

Xiao

Luo

2007

2007 IEEE International Conference on Control and Automation

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Because of exhaust emission and fuel consumption request, ECU of modern gas engines usually use lean burn control techniques. Most of the engine lean burn control systems are based on linear oxygen sensor to measure air/fuel ratio. In this paper, a low-cost torque estimation for LPG engine control system has been developed. Lambda oxygen sensor is used instead of linear oxygen sensor. Algorithms suitable for real-time computation are employed for engine indicated torque estimation. The indicated torque is used as feedback variable for electronic throttle valve control, and used as feedforward compensation for fuel control. Although there is no linear oxygen sensor to measure air/fuel ratio, the LPG engines can be controlled to stable lean burn state, and satisfy output power, less fuel consumption and lower emission requirement simultaneously.

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A method of lean air–fuel ratio control using combustion pressure measurement

et al. 2001

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A method of lean air-fuel ratio control using combustion pressure measurement Lee, Albert T.; Wilcutts, Mark; Tunestål, Per; Hedrick, J. Karl General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal Take down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. AbstractIn this paper a method for control of air-fuel ratio (AFR) in cold or lean-burning spark-ignited engines is investigated. The technique uses combustion pressure as measured by a cylinder-mounted sensor, and is based on the phenomenon of increasing cycleto-cycle combustion pressure variation as the air-fuel mixture approaches the limits of flammability. The cylinder pressure is measured from one engine cycle to the next, and large drops in mean effective pressure (IMEP) are used as an indicator of poor combustion. In response, the airflow or fuel flow to the engine can be manipulated. In a series of experiments, the air and fuel are alternately investigated as control inputs, and performance compared. The resulting control system is a high-bandwidth AFR control strategy that can be used under cold or lean conditions when conventional exhaust gas oxygen sensor cannot be used. Moreover, the method is directly tied to the combustion process and the relevant performance measure F combustion stability F that is perceptible to the driver as a rough-running engine. r

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Development of an Air/Fuel Ratio Control System for Lean Burn Gas Engines

Cited by 5 publications

References 1 publication

$$\hbox {CO}_{2}$$ CO 2 Reduction Request and Future High-Efficiency Zero-Emission Argon Power Cycle Engine

$$\hbox {CO}_{2}$$ CO 2 Reduction Request and Future High-Efficiency Zero-Emission Argon Power Cycle Engine

The Lean Burn Control for LPG Engine Using Torque Estimation

A method of lean air–fuel ratio control using combustion pressure measurement

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