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Research Papers

Modeling and Control of a Diesel Engine With Regenerative Hydraulic-Assisted Turbocharger

[+] Author and Article Information
Tao Zeng

Mechanical Engineering,
Michigan State University,
East Lansing, MI 48824
e-mail: zengtao2@msu.edu

Guoming Zhu

Fellow ASME
Mechanical Engineering,
Michigan State University,
East Lansing, MI 48824
e-mail: zhug@egr.msu.edu

1Corresponding author.

Manuscript received September 26, 2017; final manuscript received October 29, 2018; published online November 28, 2018. Assoc. Editor: Stani Bohac.

J. Eng. Gas Turbines Power 141(5), 051004 (Nov 28, 2018) (12 pages) Paper No: GTP-17-1532; doi: 10.1115/1.4041932 History: Received September 26, 2017; Revised October 29, 2018

Diesel engines are of great challenges due to stringent emission and fuel economy requirements. Compared with the conventional turbocharger system, regenerative assisted system provides additional degrees-of-freedom for turbocharger speed control. Hence, it significantly improves control capability for exhaust-gas-recirculation (EGR) and boost pressure. This paper focuses on modeling and control of a diesel engine air-path system equipped with an EGR subsystem and a variable geometry turbocharger (VGT) coupled with a regenerative hydraulic-assisted turbocharger (RHAT). The challenges lie in the inherent coupling among EGR, turbocharger performance, and high nonlinearity of the engine air-path system. A control-oriented nonlinear RHAT system model is developed; and a linear quadratic (LQ) control design approach is proposed in this paper to regulate the EGR mass flow rate and boost pressure simultaneously and the resulting closed-loop system performance can be tuned by properly selecting the LQ control weighting matrices. Multiple LQ controllers with integral action are designed based on the linearized system models over a gridded engine operational map and the final gain-scheduling controller for a given engine operational condition is obtained by interpreting the neighboring LQ controllers. The gain-scheduling LQ controllers for both traditional VGT-EGR and VGT-EGR-RHAT systems are compared with the in-house baseline controller, consisting of two single-input and single-output (SISO) controllers, against the nonlinear plant. The simulation results show that the designed multi-input and multi-output LQ gain-scheduling controller is able to manage the performance trade-offs between EGR mass flow and boost pressure tracking. With the additional assisted and regenerative power available on the turbocharger shaft for the RHAT system, engine transient boost pressure performance can be significantly improved without compromising the EGR tracking performance, compared with the baseline control.

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References

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Figures

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Fig. 1

Diesel engine equipped with RHAT system

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Fig. 2

Set-points for diesel engine air-path control

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Fig. 3

Tracking reference generation in production controller

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Fig. 4

System model architecture and calculating loops

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Fig. 5

Model validation results using the FTP 75 driving cycle

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Fig. 6

Proposed LQI regulator for engine EGR–VGT air-path system

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Fig. 7

A step load test profile for engine operated at 800 rpm with 20 mg/cc

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Fig. 8

Normalized VGT–EGR performance indexes as a function of Q

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Fig. 9

Normalized VGT–EGR–RHAT performance indexes as a function of Q

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Fig. 10

Gain-scheduling for local linear controllers

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Fig. 11

Gain-scheduling route for controller validation

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Fig. 12

Simulation results for VGT–EGR–RHAT control design: (a) boost pressure tracking error (hPa), (b) EGR MFR tracking error (kg/h), (c) VGT position, (d) EGR valve position, (e) pressure difference across EGR valve, and (f) hydraulic actuation power (kW)

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Fig. 13

Comparing different control designs

Tables

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