HCCI combustion timing control with Variable Valve Timing

Ebrahimi, Khashayar; Koch, Charles Robert

doi:10.1109/acc.2013.6580522

Cited by 12 publications

(5 citation statements)

References 15 publications

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“…Performance of the new controller is compared to a PI controller developed in a previous study [7] and the results show that the Fdfwd/Fdbk controller performance has improved tracking of the desired combustion timing and performs well in maintaining a desirable engine combustion timing during load and engine speed disturbances.…”

Section: Discussionmentioning

confidence: 88%

“…Then the disturbance rejection properties of the controller are evaluated for step changes in the engine speed and load. The controller performance is also compared to the manually tuned PI controller [7]. Figure 7 shows the controller tracking performance for θ 50 set point changes.…”

Section: Controller Performancementioning

confidence: 99%

“…In this work, a Feedforward/Feedback (Fdfwd/Fdbk) controller is developed for HCCI combustion timing control on a single cylinder research engine with valve timing as the actuator. Similar to [7], symmetric Negative Valve Overlap (NVO) is used as a variable valve timing strategy in which the exhaust valves are closed before top dead center (TDC) of the exhaust stroke and the intake valves are opened after TDC of the same stroke. The controller is based on a model that relates combustion timing to the valve timing in feedforward and combustion timing is used as feedback to zero the steady state error using a constant gain integrator (see figure 2).…”

Section: Introductionmentioning

confidence: 99%

“…A PI controller is implemented in a single cylinder research engine for combustion timing control where the amount of trapped residual gas mass is varied using the negative valve overlap duration [7]. A baseline controller is used for combustion timing K. Ebrahimi, A. Schramm and C. R. Koch are with the Department of Mechanical Engineering, University of Alberta, Edmonton, AB, T6G 2G8 , Canada (e-mail: ebrahimi@ualberta.ca, schramm@ualberta.ca; bob.koch@ualberta.ca).…”

Section: Introductionmentioning

confidence: 99%

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Feedforward/Feedback control of HCCI combustion timing

Ebrahimi

Schramm

Koch

2014

2014 American Control Conference

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Homogeneous Charge Compression Ignition (HCCI) engines have the advantage of low Nitrogen Oxides (NO x ) and soot emissions. In HCCI engines, a lean premixed air-fuel mixture is compressed until the temperature is high enough for combustion to occur. HCCI engines have a limited operating range and are limited by knock at high loads and misfire at low loads. They are without a direct source to initiate ignition so HCCI requires combustion timing control. Some of the factors that affect HCCI combustion timing are mixture composition, pressure and temperature at the time of inlet valve closing. One effective way to control HCCI combustion timing is Variable Valve Timing (VVT). VVT changes the amount of trapped residual gas and the effective compression ratio. These factors have a strong effect on HCCI combustion timing. One main advantage of VVT is that it is fast enough to handle rapid transients. Based on a simplified control oriented model that models the effect of trapped residual gas on combustion timing, a Feedforward/Feedback controller is designed for HCCI combustion timing control . The controller requires feedforward information of the valve timing and feedback information of the combustion timing. This controller tracks the desired combustion timing trajectory both in simulation and experiment by modulating the trapped residual gas using VVT actuation.

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Section: Discussionmentioning

confidence: 88%

Section: Controller Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Feedforward/Feedback control of HCCI combustion timing

Ebrahimi

Schramm

Koch

2014

2014 American Control Conference

Self Cite

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“…In the first group, CA50 is the most common variable which has been controlled, because it is a robust indicator of HCCI combustion [45]. References [35], [46], [47], [48] and [49] are some examples of CA50 control studies. The design of double and triple controllers can be complex because control of one variable can have impact on the other control variables, which either leads to a restriction in the operating range or causes discrepancy in the controller's performance.…”

Section: Single-output Vs Multi-output Controllersmentioning

confidence: 99%