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Research Papers

Sliding Mode Control of Both Air-to-Fuel and Fuel Ratios for a Dual-Fuel Internal Combustion Engine

[+] Author and Article Information
Stephen Pace

Department of Electrical and Computer Engineering,  Michigan State University, East Lansing, MI 48824paceste1@msu.edu

Guoming G. Zhu1

Department of Electrical and Computer Engineering,  Michigan State University, East Lansing, MI 48824; Department of Mechanical Engineering,  Michigan State University, East Lansing, MI 48824zhug@msu.edu

1

Corresponding author.

J. Dyn. Sys., Meas., Control 134(3), 031012 (Apr 04, 2012) (12 pages) doi:10.1115/1.4005513 History: Received January 26, 2011; Revised November 04, 2011; Accepted November 15, 2011; Published April 03, 2012; Online April 04, 2012

A multi-input-multi-output (MIMO) sliding mode control scheme was developed with guaranteed stability to simultaneously control air-to-fuel ratio (AFR) and fuel ratios to desired levels under various air flow disturbances by regulating the mass flow rates of engine port-fuel-injection (PFI) and direct injection (DI) systems. The sliding mode control performance was compared with a baseline multiloop proportional integral differential (PID) controller through simulations and showed improvements. A four cylinder mean value engine model and the proposed sliding mode controller were implemented into a hardware-in-the-loop (HIL) simulator and a target engine control module, and HIL simulations were conducted to validate the developed controller for potential implementation in an automotive engine.

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Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Diagram of AFR and fuel ratio control problem

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Figure 2

Equivalence and fuel ratio model

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Figure 3

Schematic diagram of sliding mode control strategy

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Figure 4

Maximum and minimum eigenvalues of X (ɛ)

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Figure 5

Schematic diagram of PID controller

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Figure 6

Closed loop response of simulation #1

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Figure 7

Closed loop response of simulation #2

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Figure 8

Closed loop response of simulation #3

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Figure 9

Comparison of state estimation and actual states in HIL simulation

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Figure 10

HIL simulation setup

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Figure 11

HIL timing scheme

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Figure 12

Response of ratios for different β

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Figure 13

CL response of HIL simulation of fuel ratio step down

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Figure 14

CL response of HIL simulation for step equivalence ratio

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