Model-Based Air-Fuel Ratio Control of a Lean Multi-Cylinder Engine

Fekete, Nicholas P.; Nester, Ulrich; Gruden, Igor; Powell, J. David

doi:10.4271/950846

Cited by 28 publications

(8 citation statements)

References 18 publications

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“…A turbo-compressor was added to engine for two purposes: charging extra air to engine (supercharging) and charging air to ABC. The fraction of charged air entering ABC was controlled by a throttle [51][52][53] installed before ABC heat exchanger. In fact, this throttle controls the rate of air shared between engine and ABC.…”

Section: Air Brayton Cyclementioning

confidence: 99%

Energy and exergy analysis of a novel turbo-compounding system for supercharging and mild hybridization of a gasoline engine

Salek

Babaie

Ghodsi

et al. 2020

J Therm Anal Calorim

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Number of hybrid vehicles has increased around the world significantly. Automotive industry is utilizing the hybridization of the powertrain system to achieve better fuel economic and emissions reduction. One of the options recently considered in research for hybridization and downsizing of vehicles is to employ waste heat recovery systems. In this paper, the addition of a turbo-compound system with an air Brayton cycle (ABC) to a naturally aspirated engine was studied in AVL BOOST software. In addition, a supercharger was modeled to charge extra air into the engine and ABC. The engine was first validated against the experimental data prior to turbo-compounding. The energy and exergy analysis was performed to understand the effects of the proposed design at engine rated speed. Results showed that between 16 and 18% increase in engine mechanical power can be achieved by adding turbo-compressor. Furthermore, the recommended ABC system can recover up to 1.1 kW extra electrical power from the engine exhaust energy. The energy and exergy efficiencies were both improved slightly by turbo-compounding and BSFC reduced by nearly 1% with the proposed system. Furthermore, installing the proposed system resulted in increase in backpressure up to approximately 23.8 kPa.

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Section: Air Brayton Cyclementioning

confidence: 99%

Energy and exergy analysis of a novel turbo-compounding system for supercharging and mild hybridization of a gasoline engine

Salek

Babaie

Ghodsi

et al. 2020

J Therm Anal Calorim

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“…Speed-density methods have the advantage of estimating the air to the cylinder which do not suffer from the sensor dynamics of the air mass flow sensor [4] or the filling and emptying dynamics of the intake manifold [1]. To reduce noise, due to standing waves and engine pumping, in the intake manifold pressure signal, observers for mean intake manifold pressure have been proposed [4,5].…”

Section: Speed-density Principlesmentioning

confidence: 99%

“…Properties In Equation (13)ṁ ac ts is calculated using Equation (5). This observer structure does not suffer from a steadystate error but problems was reported during intake manifold pressure transients since the observer updated ∆η vol incorrectly.…”

Section: Observer With Integration Of η Volmentioning

confidence: 99%

Air-to-Cylinder Observer on a Turbocharged SI-Engine with Wastegate

Andersson¹,

Eriksson²

2001

SAE Technical Paper Series

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Observers for air mass flow to the cylinder is studied on a turbocharged SI-engine with wastegate. A position change of the wastegate influences the residual gas mass and causes the volumetric efficiency to change, which produces a transient in the air mass flow to the cylinder. Two standard methods of estimating air-to-cylinder are investigated. A new nonlinear air-to-cylinder observer is suggested with two states: one for intake manifold pressure and one for the offset in in-cylinder air mass compared to expected through the volumetric efficiency. The observers are validated on intake manifold pressure data from a turbocharged spark ignited production engine with wastegate.

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“…2), which is referred to as the 'two-stroke cycle delay'. Therefore, the fuel mass By using equation ( 4), the pressure terms in equation (3) injected must be calculated on the basis of the estimation can be eliminated and the in-cylinder air mass can be of the air mass that will be inducted during the correcalculated using sponding induction process for accurate AFR control. Since only the in-cylinder air mass at the current instant M c,n+ 1 =kM c,n +(1 Õk)M th,n+ 1 (5) is known, the in-cylinder air mass after two strokes must where be estimated.…”

Section: Intake Air Modellingmentioning

confidence: 99%

Transient air-fuel ratio control of a multi-point injection engine with an integration-type ultrasonic flowmeter

Kim

Kang

Kauh

2001

Proceedings of the Institution of Mechanical Engineers, Part D:

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An integration-type owmeter, composed of an ultrasonic owmeter and an integration circuit, is used to measure the air mass for transient air-fuel ratio (AFR) control of a port fuel injection (PFI ) spark ignition engine. Also, the air mass and required fuel mass in the cylinder are accurately calculated for precise AFR control. The proposed method can signi cantly improve the accuracy of measuring air mass inducted through a throttle valve. Air mass passing into a cylinder is estimated using the measured air mass at the throttle valve and intake manifold pressure. A simple two-constant fuel model is used for a dynamic fuel model. Control parameters from the air and fuel dynamics are applied to minimize AFR excursions, and a four-cylinder, 1.5 l PFI engine was used to demonstrate this AFR control strategy. Results show that the AFR followed a command value with a peak error of 4 per cent during throttle transients at various operating points.

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Model-Based Air-Fuel Ratio Control of a Lean Multi-Cylinder Engine

Cited by 28 publications

References 18 publications

Energy and exergy analysis of a novel turbo-compounding system for supercharging and mild hybridization of a gasoline engine

Energy and exergy analysis of a novel turbo-compounding system for supercharging and mild hybridization of a gasoline engine

Air-to-Cylinder Observer on a Turbocharged SI-Engine with Wastegate

Transient air-fuel ratio control of a multi-point injection engine with an integration-type ultrasonic flowmeter

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