The Dynamic Effect of Residual Gas Temperature on Combustion Torque at Idle

Ford, Richard G.; Collings, Nick

doi:10.4271/2001-01-3558

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…The faster waveform seems to indicate that there is in fact some dynamic behaviour between the spark and torque production. This behaviour is likely to be caused by the differing temperatures of the residual gases in the cylinder, a previously unreported phenomenon which is examined in more depth in [11,12]. Figures 8a and 8b show the behaviour of the torque model when the ABV position is varied in a sinusoidal manner.…”

Section: Torque Productionmentioning

confidence: 97%

Spark Ignition Engine Idle Speed Control Using a Novel Framework and Enabling Control of the Tradeoff between Fuel Consumption and Load Rejection Capability

Ford¹,

Glover²

2001

Vehicle System Dynamics

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In this paper, a new framework for idle speed control is presented. 1 A simple new discrete event based engine model evolving in the crank domain is given and is parameterized using a combination of dynamic identi®cation and steady state calibration. The majority of the nonlinearities can then be inverted and a second synthetic output is introduced. This second output is the torque reserve of the engine and enables control of the tradeoff between disturbance rejection capabilities and engine ef®ciency. A linear controller is designed using the H I loopshaping technique and results are presented from dynamometer based engine tests.

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Section: Torque Productionmentioning

confidence: 97%

Spark Ignition Engine Idle Speed Control Using a Novel Framework and Enabling Control of the Tradeoff between Fuel Consumption and Load Rejection Capability

Ford¹,

Glover²

2001

Vehicle System Dynamics

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“…Also there was some evidence in [4] that on the change of spark advance from a point close to MBT to a set point retarded far from MBT that the indicated torque dropped further than expected for the first event following the change, which the authors attributed to the residual gas dynamic effect. Attempts to reproduce this on the test engine are so far inconclusive, and appear to be hidden by the fluctuations in torque changing engine speed.…”

Section: Limitations Of the Modelmentioning

confidence: 99%

“…However the variation is not a completely random event, as a combustion with lower than expected torque production is often followed by a greater than average torque production the next time combustion occurs in the cylinder. The process has been previously hypothesized to be due to the temperature of the residual gas in the cylinder, termed the residual gas dynamic effect in [4], although it is far from completely understood. Briefly, the residual gas dynamic effect is explained as when one low-efficiency (i.e.…”

Section: Indicated Engine Torque Variability At Fixed Operating Pointmentioning

confidence: 99%

“…A standard result for the air fuel influence function, AFI , was found in [5] to have a sinusoidal dependence on air fuel ratio, AFR , up to a limit of 0.9. The function is represented in the following equation: • w σ is the standard deviation of combustion torque at the given operating point and is calculated by equation (4).…”

Section: A Complete Idle Speed Modelmentioning

confidence: 99%

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Modeling the Effects of Combustion Variability for Application to Idle Speed Control in SI Engines

Manzie¹,

Watson²,

Baker³

2002

SAE Technical Paper Series

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Combustion in the cylinder of a spark ignition engine, particularly under low load conditions, is subject to cycleby-cycle variations due to factors such as mixture quality and quantity and internal exhaust gas recirculation. The major result of this phenomenon is an increase in the variability of indicated engine torque at a given engine operating point. Automotive control problems dealing with torque production at low engine loads, particularly the control of idle speed, rely on accurate information about the transfer functions of different engine subsystems, however combustion variability and the effect it has on torque production is often overlooked. In this paper we illustrate the effects that combustion variability at idle has on different transfer functions related to indicated torque, and propose new models for torque production at constant operating points. We also present a model of an in-line, six-cylinder, 4.0 litre Ford engine for use in idle speed simulations and control applications. The integration of combustion variability into an idle speed control framework is also discussed.

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Modelling Combustion Variability in LPG Injected Engines for Improved Engine Performance at Idle

Manzie

Watson

2004

SAE Technical Paper Series

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The Dynamic Effect of Residual Gas Temperature on Combustion Torque at Idle

Cited by 4 publications

References 5 publications

Spark Ignition Engine Idle Speed Control Using a Novel Framework and Enabling Control of the Tradeoff between Fuel Consumption and Load Rejection Capability

Spark Ignition Engine Idle Speed Control Using a Novel Framework and Enabling Control of the Tradeoff between Fuel Consumption and Load Rejection Capability

Modeling the Effects of Combustion Variability for Application to Idle Speed Control in SI Engines

Modelling Combustion Variability in LPG Injected Engines for Improved Engine Performance at Idle

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