Combustion Stability Control Based on Cylinder Pressure for High Efficiency Gasoline Engines

Jean, Maxime; Granier, Pascal; Leroy, Thomas

doi:10.3390/en15072530

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…The tests observing the in-cylinder processes and measuring the exhaust emissions for the two different combustion systems were carried out at a constant engine speed n = 1500 rpm and at IMEP = 6.5 bar and for two values of the excess air coefficient. The engine operation stability criterion was defined as the engine operation non-repeatability determined by the value of the CoV(IMEP) coefficient < 3.0% [32] (older sources assigned this indicator a value of 10% [33]; sometimes, intervals were defined to obtain stable or semi-stable combustions [32]). This indicator was defined as:…”

Section: Test Conditionsmentioning

confidence: 99%

Two- and Three-Stage Natural Gas Combustion System—Experimental Comparative Analysis

Pielecha

Szwajca

2023

Energies

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The use of fuels with tendencies to reduce carbon dioxide emissions, particularly gaseous fuels, and improve combustion systems is one of the directions for increasing an internal combustion engine’s attractiveness as a power source. This article presents the effects of combining natural gas combustion with a multi-stage combustion system. A two- and three-stage lean charge combustion system was proposed in order to increase the energy system efficiency. In order to achieve this, a single-cylinder test engine was used, with two interchangeably implemented combustion systems. The tests were carried out with two values of the excess air coefficient (λ = 1.3 and λ = 1.5), as well as two different fuel dose values (qo = 0.35 and 0.55 mg/inj), injected into the prechamber at the same indicated mean effective pressure value (IMEP = 6.5 bar) and the same engine speed (n = 1500 rpm). Based on the obtained research results, it was found that the use of a three-stage system limited the maximum combustion pressure and heat release rate due to the increased resistance of flows between the chambers. At the same time, it was found that the increase in the engine’s indicated efficiency took place in a two-stage system, regardless of the excess air coefficient. Changing the dose of fuel fed into the prechamber significantly affects the engine performance (and efficiency) but only in the two-stage combustion system.

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Section: Test Conditionsmentioning

confidence: 99%

Two- and Three-Stage Natural Gas Combustion System—Experimental Comparative Analysis

Pielecha

Szwajca

2023

Energies

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“…In particular, EGR systems effectively reduce nitrogen oxides and pumping losses, and attempts are being made to use large amounts of EGR gas. 1–4 However, as the ratio of EGR gas in the intake manifold increases, torque overshoot may occur due to the transient excess of fresh air and fuel when the gas pedal is depressed. This phenomenon should be avoided as much as possible because it causes discomfort to the driver and degrades fuel efficiency.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear feedforward controller design of gasoline engine air-path system for reducing engine torque overshoot

Shiraishi,

Hirata,

Suzuki

2024

International Journal of Engine Research

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In gasoline engines, the amount of fresh air in the cylinder becomes temporarily excessive owing to the slow response in exhaust gas recirculation (EGR) gas under a high EGR ratio. This phenomenon should be avoided, as it causes an engine torque overshoot because the amount of fuel also increases to follow the stoichiometric ratio, and can cause discomfort to the driver. In this study, we investigate reducing torque overshoot using a feedforward controller, which is a simple and effective method for improving the response of a control system. The feedforward controller is typically designed based on the inverse of the plant model. However, designing a feedforward controller for a high-order and nonlinear plant, such as an engine air-path system, can be challenging. Therefore, we exploit the fact that if a given nonlinear system satisfies the flatness property, a feedforward controller based on the inverse model can be easily obtained. The effectiveness of the proposed feedforward controller is evaluated through simulations.

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Combustion of Lean Methane/Propane Mixtures with an Active Prechamber Engine in Terms of Various Fuel Distribution

Pielecha

Szwajca

2023

Energies

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The possibilities for reducing the fuel consumption of internal combustion engines focus mainly on developing combustion systems, as one such solution is a two-stage combustion system using jet ignition. The combustion of gaseous mixtures with a high excess air ratio leads to an increase in overall efficiency and a reduction in the emissions of selected exhaust components. In such a convention, gas combustion studies were conducted in the methane/propane configuration. Using an active prechamber where spark plugs were placed and direct injection through a check valve, the fuel dose was minimized into the prechamber. The tests were conducted for a constant center of combustion (CoC). The combustion process in both the prechamber and main chamber was analyzed using a test stand equipped with a 0.5 dm3 single-cylinder engine. The engine was controlled by varying the fuel supply to the prechamber and main chamber in excess air ratio λ = 1.3–1.8. The study analyzed thermodynamic indices such as the combustion pressure in both chambers, based on which the SoC in both chambers, the rate and amount of heat released, AI05, AI90 and, consequently, the indicated efficiency were determined. Based on the results, it was found that the use of CH4/C3H8 combination degraded the thermodynamic indicators of combustion more than using only the base gas (methane). In addition, the stability of the engine’s operation was decreased. The advantage of using propane for the prechamber is to obtain more beneficial ecological indicators. For the single-fuel system, a maximum indicated efficiency of more than 40% was obtained, while with the use of propane for the prechamber, a maximum of 39.3% was achieved.

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Combustion Stability Control Based on Cylinder Pressure for High Efficiency Gasoline Engines

Cited by 3 publications

References 19 publications

Two- and Three-Stage Natural Gas Combustion System—Experimental Comparative Analysis

Two- and Three-Stage Natural Gas Combustion System—Experimental Comparative Analysis

Nonlinear feedforward controller design of gasoline engine air-path system for reducing engine torque overshoot

Combustion of Lean Methane/Propane Mixtures with an Active Prechamber Engine in Terms of Various Fuel Distribution

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