Research Papers

Extended Kalman Filter Based In-Cylinder Temperature Estimation for Diesel Engines With Thermocouple Lag Compensation

[+] Author and Article Information
Song Chen

Department of Mechanical Engineering,
McMaster University,
Hamilton, ON, L8S 4L7, Canada
e-mail: chens78@mcmaster.ca

Fengjun Yan

Department of Mechanical Engineering,
McMaster University,
Hamilton, ON, L8S 4L7, Canada
e-mail: yanfeng@mcmaster.ca

1Corresponding author.

Contributed by the Dynamic Systems Division of ASME for publication in the JOURNAL OF DYNAMIC SYSTEMS, MEASUREMENT, AND CONTROL. Manuscript received July 8, 2013; final manuscript received March 10, 2014; published online June 12, 2014. Assoc. Editor: Gregory Shaver.

J. Dyn. Sys., Meas., Control 136(5), 051010 (Jun 12, 2014) (8 pages) Paper No: DS-13-1264; doi: 10.1115/1.4027170 History: Received July 08, 2013; Revised March 10, 2014

The in-cylinder temperature information is critical for auto-ignition combustion control in diesel engines, but difficult to be directly accessed at low cost in production engines. Through investigating the thermodynamics of Tivc, cycle-by-cycle models are proposed in this paper for the estimation of in-cylinder temperature at the crank angle of intake valve closing (IVC), referred to as Tivc. An extended Kalman filter (EKF) based method was devised by utilizing the measurable temperature information from the intake and exhaust manifolds. Due to the fact that measured temperature signals by typical thermocouples have slow responses which can be modeled as first-order lags with varying time-constants, temperature signals need to be reconstructed in transient conditions. In the proposed EKF estimation method, this issue can be effectively addressed by analyzing the measurement errors and properly selecting the noises covariance matrices. The proposed estimation method was validated through a high-fidelity GT-power engine model.

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Fig. 1

Diesel engine schematic diagram

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Fig. 2

Mass of injected fuel

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Fig. 3

Normalized EGR valve opening (0—fully close; 1—fully open)

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Fig. 4

Simulated intake manifold temperature

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Fig. 5

Simulated exhaust manifold temperature

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Fig. 6

Comparison between the estimated and actual in-cylinder temperatures at IVC

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Fig. 7

Error of the estimated in-cylinder temperature at IVC

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Fig. 8

The simulated time-constant for the thermocouples in intake and exhaust manifolds: (a) the time-constant of the thermocouple in the intake manifold and (b) the time-constant of the thermocouple in the exhaust manifold

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Fig. 9

Estimated Tivc without consideration of the thermocouple delay: (a) estimated Tivc and (b) error of estimation

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Fig. 10

Estimated Tivc by the proposed method: (a) estimated Tivc and (b) error of estimation




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