Air-Fuel Ratio Regulation with Optimum Throttle Opening in Diesel-Dual-Fuel Engine

Chatlatanagulchai, Withit; Yaovaja, Kittipong; Rhienprayoon, Shinapat; Wannatong, Krisada

doi:10.4271/2010-01-1574

Cited by 16 publications

(8 citation statements)

References 6 publications

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“…Factually, lowering the amount of excess air with throttle control effectively enables one to increase in-cylinder average mixture temperature and improve flame propagation [3], which provides an effective approach to improve the excess air ratio and engine performance. Moreover, to better control the excess air ratio a few studies on NG dual-fuel diesel engines have been reported to obtain proper air-fuel ratio regulation with control of the throttle opening [8,10,[14][15][16][17][18]. Unfortunately, little research has been done to extensively explore the effects of adjusting the excess air ratio on the dual-fuel combustion under light load.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effects of Air Supply Control on Combustion and Emissions Performance at Medium and Low Load for a Dual-Fuel Diesel Engine

et al. 2018

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Lowering the amount of excess air is believed to increase the density of the air-fuel mixture and help improve the combustion rate for compression ignition engines. This paper proposes an approach of adding a throttle body at the intake pipe to control the excess air ratio with reduction of air supply to achieve a better balance between the power, emissions and fuel efficiency at medium and low load of a natural gas dual-fuel diesel engine converted from a conventional diesel engine. Various experiments in both pure diesel and dual-fuel mode under intermediate engine speed are performed with the proposed critical method of excess air ratio control. The experimental results reveal that better excess air ratio is very beneficial for the power output and brake specific energy consumption in dual-fuel combustion under medium and low load conditions. Moreover, the substitution rate can reach as high as 40% under low load conditions with throttle control.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effects of Air Supply Control on Combustion and Emissions Performance at Medium and Low Load for a Dual-Fuel Diesel Engine

et al. 2018

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“…Ref. [22] presented an algorithm in choosing to actuate either throttle or EGR valve to regulate air/fuel ratio of a DDF engine, while pumping loss is minimized. Ref.…”

Section: Introductionmentioning

confidence: 99%

Sliding Mode Control of Air Path in Diesel-Dual-Fuel Engine

Chatlatanagulchai¹,

Moonmangmee²,

Rhienprayoon³

et al. 2011

SAE Technical Paper Series

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In diesel-dual-fuel engine, CNG is injected at the intake ports and diesel fuel is injected at the cylinders. As a result of using CNG as main fuel, smaller amount of diesel is used mainly for ignition, resulting in lower fuel cost. However, stricter air path control is required because the engine now operates partly as a port fuel injection engine and partly as a diesel engine. As is evident from engine calibration, desired MAP and MAF have more abrupt change with wider range than those of diesel engine. In typical commercial truck, MAP and MAF are controlled separately using traditional controller such as PID with marginal control performance. Recently, more researchers have combined the control of MAP and MAF together as multivariable problem because both quantities reflect the behavior of the air path. In this paper, multivariable sliding mode control (SMC) is implemented in two-approaches, a model-reference-based and an integrator-augmented based. The diesel-dual-fuel engine was converted from a diesel engine and used in the engine test bed. Throttle and EGR valve were actuated to regulate MAP and MAF at their respective set points. Experimental results at an engine speed of 2000 rpm and 20% pedal showed that the two proposed algorithms delivered good tracking performance with fast action. The MAP and MAF responses were able to track their desired values with 2.5 seconds settling time and less than 10% overshoot. The integrator-augmented SMC had more response accuracy than the model-reference SMC but with more chattering.

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“…Ref. [1] presents an algorithm in choosing to actuate either throttle or EGR valve to regulate air/fuel ratio, while pumping loss is minimized. Ref.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Feedback Control of Air Path in Diesel-Dual-Fuel Engine

Chatlatanagulchai

Pongpanich

Wannatong

et al. 2010

SAE Technical Paper Series

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In this paper, we investigate a multivariable control of air path of a diesel-dual-fuel (DDF) engine. The engine is modified from a CI engine by injecting CNG in intake ports. The engine uses CNG as its primary fuel and diesel as its secondary fuel, mainly for initiation of combustion. The modification is economically attractive because CNG has lower price than diesel and the modification cost is minimal. However, for DDF engine, control of the air path becomes more difficult because the engine now has combined characteristics of the CI and the SI engines. The combined characteristics come from the fact that diesel is still directly injected into cylinders (CI engine) while CNG is injected at the intake ports (SI engine.) In pure CI engine, throttle is normally fully opened for maximum air intake, while EGR valve is actively actuated to obtain low emissions. In pure SI engine, however, throttle is an active actuator, driven by pedal. The air path control of the DDF engine, therefore, is a multivariable problem, where both throttle and EGR valve are actively actuated to obtain desired outputs. Two outputs that are of particular interest are mass air flow (MAF) and manifold air pressure (MAP). They are directly available from existing vehicle sensors and are good indicators of the air path characteristic. Their desired values are normally obtained as fixed maps during engine calibration. We formulate a control problem, having throttle and EGR valve openings as inputs and MAF and MAP as outputs. Because of high level of input-to-output interactions, a fully multivariable controller is preferred over the decentralized control. A multivariable control based on the quantitative feedback theory (QFT) is designed and implemented. The QFT-based controller is attractive because its robustness amount can be quantified. Control design plant model is allowed to have uncertainty within a boundary called plant template. For all uncertainty within a plant template, a controller and a prefilter are designed from loop shaping to enforce several frequency-domain specifications such as tracking, stability, disturbance and noise rejections, and control effort limitation. A 2KD-FTV Toyota CI engine is modified as a DDF engine and is installed in a test cell with an engine dynamometer. A system identification of the air path is performed to obtain a control design model. Both simulation and experimental results on the engine show the effectiveness of the proposed control system in tracking step changes of desired MAF and MAP.

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Air-Fuel Ratio Regulation with Optimum Throttle Opening in Diesel-Dual-Fuel Engine

Cited by 16 publications

References 6 publications

Experimental Study on the Effects of Air Supply Control on Combustion and Emissions Performance at Medium and Low Load for a Dual-Fuel Diesel Engine

Experimental Study on the Effects of Air Supply Control on Combustion and Emissions Performance at Medium and Low Load for a Dual-Fuel Diesel Engine

Sliding Mode Control of Air Path in Diesel-Dual-Fuel Engine

Quantitative Feedback Control of Air Path in Diesel-Dual-Fuel Engine

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