Multi-Mode Combustion Strategies with CAI for a GDI Engine

Kulzer, André; Hathout, J. P.; Sauer, Christina; Karrelmeyer, Roland; Fischer, Wolfgang; Christ, Ansgar

doi:10.4271/2007-01-0214

Cited by 26 publications

(12 citation statements)

References 14 publications

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“…Although it would be possible to identify airflow and combustion parameters to improve the fit of the model to experimental data, a detailed identification was set aside for the moment. The model was compared to experimental data measured at a 4 cylinder research engine at the Robert Bosch Research Center, Schwieberdingen [17]. In Figure 3, experiments and simulations for three different EVC timings and a change in the injection timing, are plotted for the steady state cases.…”

Section: E Validationmentioning

confidence: 99%

Simulation of misfire and strategies for misfire recovery of gasoline HCCI

Knierim

Park

Ahmed

et al. 2008

2008 American Control Conference

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In HCCI mode with negative valve overlap, the understanding of the engine behavior in case of misfire and delayed combustion is important to provide a complete control strategy. A hybrid continuous zero dimensional model for gasoline HCCI, based on simplified chemical kinetics and a separate airflow model is introduced. CHEMKIN is used to simulate the chemical kinetics, whereas the airflow and the injection is simulated using MatLab. The model is compared to experimental data. The introduced model is used to analyze the effect of misfire and late combustions on the dynamics of the system. A state transition map is proposed to distinguish between misfire with and without recovery. Control strategies to improve the misfire recovery are suggested.

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Section: E Validationmentioning

confidence: 99%

Simulation of misfire and strategies for misfire recovery of gasoline HCCI

Knierim

Park

Ahmed

et al. 2008

2008 American Control Conference

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“…federal test procedure (FTP-75), operate frequently in the feasible operating regime of HCCI, but due to its limitations a gasoline HCCI engine will be required to return to traditional spark-ignited (SI) combustion to cover the required range of engine load and speed [7].…”

Section: Introductionmentioning

confidence: 99%

Mode switches among SI, SACI, and HCCI combustion and their influence on drive cycle fuel economy

Nüesch

Hellström

Jiang

et al. 2014

2014 American Control Conference

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A vehicle and driver model from [1] is here integrated with a finite state model describing mode switches among spark-ignited (SI) combustion and the advanced combustion modes spark assisted compression ignition (SACI) and homogeneous charge compression ignition (HCCI). The model is used to quantify the influence of mode switch fuel penalties on drive cycle fuel economy considering the federal test procedure (FTP-75) and highway fuel economy test (HWFET). The simulation under the assumed fuel penalties and dynamics shows a very small fuel loss due to harmful switches. Harmful switches are mode switches that lead to short stays in the advanced combustion, where the penalty in switching is greater than the benefit achieved after the switch. The simulations also highlight the benefits of integrating the SACI mode. Apart from extending the fuel efficiency improvements beyond the HCCI range, it is postulated that SACI combustion is easier to reach (lower fuel penalty and faster response than the HCCI-SI switch) from both SI and HCCI, creating a bridge and an economic destination in the overall speed-load space. The combined operation of SACI and HCCI leads to substantially higher improvements, especially for the FTP-75 drive cycle, than using either mode individually.

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“…To utilize effectively the merits of HCCI and LTC, compound HCCI combustion based on mode transitions or mixture stratification was recently proposed. Compound HCCI combustion based on mode transition refers to the operation of the engine in HCCI mode or LTC mode at low, medium, and cruising load conditions and switching over to SI mode or DICI mode at cold start, idle, and large to full load conditions [95][96][97][98]. The mode transition from HCCI to SI, including throttle action, can be obtained in less than ten cycles, but there is fluctuation in switching over from SI to HCCI mode that requires being optimized [99].…”

Section: Strategies and Methods Of Fuel Design And Management For Sccmentioning

confidence: 99%