Research Papers

Exhaust Pressure Estimation and Its Application to Detection and Isolation of Turbocharger System Faults for Internal Combustion Engines

[+] Author and Article Information
Yue-Yun Wang

Ibrahim Haskara

e-mail: ibrahim.haskara@gm.com Propulsion Systems Research Lab, General Motors Research & Development, 30500 Mound Road, Warren, MI 48090

J. Dyn. Sys., Meas., Control 134(2), 021002 (Dec 29, 2011) (8 pages) doi:10.1115/1.4005045 History: Received July 19, 2010; Revised June 15, 2011; Published December 29, 2011; Online December 29, 2011

Engine exhaust backpressure is a critical parameter in the calculation of the volumetric efficiency and exhaust gas recirculation flow of an internal combustion engine. The backpressure also needs to be controlled to a presetting limit under high speed and load engine operating conditions to avoid damaging a turbocharger. In this paper, a method is developed to estimate exhaust pressure for internal combustion engines equipped with variable geometry turbochargers. The method uses a model-based approach that applies a coordinate transformation to generate a turbine map for the estimation of exhaust pressure. This estimation can substitute for an expensive pressure sensor, thus saving significant cost for production vehicles. On the other hand, for internal combustion engines that have already installed exhaust pressure sensors, this estimation can be used to generate residual signals for model-based diagnostics. Cumulative sum algorithms are applied to residuals based on multiple sensor fusion, and with the help of signal processing, the algorithms are able to detect and isolate critical failure modes of a turbocharger system.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Diesel engine with VGT and EGR systems

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Figure 2

Turbine map for a turbocharger system

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Figure 3

Turbine map with new coordinates

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Figure 4

Turbine map under the new coordinates

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Figure 5

Correlation of actual and estimated pressure ratios

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Figure 6

Exhaust pressure estimation validation

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Figure 7

Exhaust pressure estimation over all engine steady state conditions

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Figure 8

Exhaust pressure estimation during FTP75 transient cycle

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Figure 9

Model-based residual generation for fault detection

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Figure 10

Exhaust pressure sensor in range high fault

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Figure 11

Detecting exhaust pressure sensor in range high fault using CUSUM

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Figure 12

Detecting pressure sensor in range low fault using CUSUM

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Figure 13

Isolation of VGT vane stuck fault

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Figure 14

Isolation of VGT vane position sensor fault

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Figure 15

(a) Detection shows that wastegate opens successfully and (b) Residual of the exhaust pressure estimate

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Figure 16

(a) Wastegate stuck close failure and (b) Exhaust pressure estimate residual for wastegate stuck close fault

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Figure 17

Wastegate successfully closed

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Figure 18

Wastegate stuck open fault



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