An experimental study of the high-load extension of a homogeneous charge compression ignition engine with gasoline and <i>n</i>-heptane

Li, Zhongzhao; Zhang, Jianyong; Zhang, Kaiqiang; Zhu, Lei; Lü, Xingcai; Huang, Zhen

doi:10.1177/0954407014524183

Cited by 3 publications

(2 citation statements)

References 35 publications

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“…To improve the thermal efficiency of gasoline engines, new combustion modes, such as lean burn, 1 homogeneous charge compression ignition (HCCI) combustion 2,3 and spark-assisted compression ignition combustion (SACI), 4,5 have emerged in traditional spark ignition (SI) engines. HCCI combustion has received more attention from researchers because of its high thermal efficiency and low emissions.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of PODE/gasoline and n-heptane/gasoline in a spark-assisted homogeneous charge compression ignition engine with dual-injection strategies and EGR

Zhao

Xia

Fang

et al. 2022

International Journal of Engine Research

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Homogeneous charge compression ignition (HCCI) has potential to improve thermal efficiency for gasoline engine due to the similar formation of mixture between HCCI and traditional spark ignition mode. High reactivity fuel combined with gasoline is used to achieve HCCI combustion with a relative low compression ratio. Polyoxymethylene dimethyl ethers (PODE) is a kind of low-carbon fuels with unique molecule structure, which is beneficial for carbon neutral. The intermediate products of PODE are different from those of long-chain alkane such as n-heptane and diesel. In this paper, the difference in spark-assisted HCCI (SA-HCCI) combustion combined with spark ignition and EGR between PODE/gasoline and n-heptane/gasoline under different operating conditions were investigated. The results illustrated that PODE/gasoline was more suitable for SA-HCCI combustion due to the positive relation between thermal efficiency and gasoline percentage, which can significantly improve the thermal efficiency while suppressing knock. Although the cetane number of PODE is greater than the n-heptane, the SA-HCCI combustion was more violent fueled with n-heptane/gasoline than that of PODE/gasoline. Low NOx and PM emissions are achieved for SA-HCCI combustion especially for PODE/gasoline. The advancing spark timing reduced the incomplete combustion and shortened the combustion duration, thus reducing the THC and CO emissions, especially fueled with PODE/gasoline. Although a low EGR rate can slightly improve the THC and CO emissions, violent combustion can be significantly improved. In general, high efficiency and low emissions could be achieved by PODE/gasoline and spark ignition combined with EGR. The brake thermal efficiency for SA-HCCI combustion fueled with PODE/gasoline increased by 30% compared with DISI mode under the same loads.

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Section: Introductionmentioning

confidence: 99%

A comparative study of PODE/gasoline and n-heptane/gasoline in a spark-assisted homogeneous charge compression ignition engine with dual-injection strategies and EGR

Zhao

Xia

Fang

et al. 2022

International Journal of Engine Research

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“…In particular, factors such as the non-linear feedback due to exhaust gas recirculation (EGR), 2 the cylinder wall effect, 3 the influences of the intake temperature 3 and the valve strategies 4 on combustion, the combustion chamber deposit effect, 5 to name but a few, can all become disturbances to the combustion process, resulting in knock or combustion oscillations. Additionally, the limited operation range 6 leads to another difficult problem of mode switching 7,8 with spark ignition (SI) combustion.…”

Section: Introductionmentioning

confidence: 99%

Compound disturbance rejection control of spark ignition–controlled-autoignition hybrid combustion for gasoline engines

Song

Xie

Hao

2017

Proceedings of the Institution of Mechanical Engineers, Part D:

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Spark ignition–controlled-autoignition hybrid combustion is a promising concept because of its capability to achieve a smooth transition between spark ignition combustion and controlled-autoignition combustion, but it suffers from transient control owing to the high sensitivity to the operating conditions. In this paper, a control solution based on the principle of disturbance rejection is proposed for spark ignition–controlled-autoignition hybrid combustion. The complexity, the non-linearity and the cross-coupling inside are removed by idealizing the combustion process into three independent integrators, for the combustion timing channel, the indicated mean effective pressure channel and the λ (excessive air coefficient) channel respectively. All the other dynamics that deviate from the integrators (internal and external) are ‘lumped’ together as the total disturbance for each channel. With the total disturbance estimated in real time via the extended-state observer and eliminated by the disturbance rejection law, the enforced plant, i.e. the integrator, is controlled by a simple proportional controller. To enhance the response further, a non-linear model-inversion-based feedforward controller is added. In order to attenuate the slow time-varying disturbances, four correction factors for the model parameters are embedded in the model for online estimation. Validations by both simulations and experiments confirm the superiority of the proposed solution in terms of a fast transient response and a high robustness. By using the bandwidth-parameterization-based extended-state observer tuning method and a Kalman-filter-based extended-state observer, the controller is easy to tune, making it a promising candidate for applications of spark ignition–controlled-autoignition hybrid combustion.

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Model Based Control of Combustion Timing and Load in HCCI Engines

Ebrahimi¹

2016

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An experimental study of the high-load extension of a homogeneous charge compression ignition engine with gasoline and n-heptane

Cited by 3 publications

References 35 publications

A comparative study of PODE/gasoline and n-heptane/gasoline in a spark-assisted homogeneous charge compression ignition engine with dual-injection strategies and EGR

A comparative study of PODE/gasoline and n-heptane/gasoline in a spark-assisted homogeneous charge compression ignition engine with dual-injection strategies and EGR

Compound disturbance rejection control of spark ignition–controlled-autoignition hybrid combustion for gasoline engines

Model Based Control of Combustion Timing and Load in HCCI Engines

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