Application of HCCI Engine in Motorcycle for Emission Reduction and Energy Saving

Wu, Yuh‐Yih; Chen, Bo–Chiuan; Wang, James H.

doi:10.4209/aaqr.2015.08.0517

Cited by 5 publications

(4 citation statements)

References 27 publications

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“…Most of the operation conditions have a BSFC ranging from 230 to 260 g/kW•h. The BSFC of a HCCI engine is much lower than that of a conventional motorcycle engine, which is approximately 350 g/kW•h [42]. When λ is >2 or BMEP is <3 bar, the BSFC clearly increases.…”

Section: Engine Performancesmentioning

confidence: 95%

Combustion Analysis of Homogeneous Charge Compression Ignition in a Motorcycle Engine Using a Dual-Fuel with Exhaust Gas Recirculation

Jang

2019

Energies

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Exhaust emissions from the large population of motorcycles are a major issue in Asian countries. The regulation of exhaust emissions is therefore becoming increasingly stringent, with those relating to nitrogen oxides (NOx) the most difficult to pass. The homogeneous charge compression ignition (HCCI) has special combustion characteristics and hence produces low NOx emissions and exhibits high thermal efficiency. This study developed an HCCI system for a 150 cc motorcycle engine. The target engine was modified using a dual-fuel of dimethyl ether (DME) and gasoline with exhaust gas recirculation (EGR). It was tested at 2000–4000 rpm and the analysis was focused on 2000 rpm. The DME was supplied continuously at an injection pressure of 1.5 kg/cm2. The gasoline injection rate was adjusted at a pressure of 2.5 kg/cm2. A brake-specific fuel consumption of <250 g/kW·h was achieved under a condition of air–fuel equivalence ratio (λ) < 2 and an EGR of 25%. The nitric oxide concentration was too low to measure. The brake mean effective pressure (BMEP) increased by 65.8% from 2.93 to 4.86 bar when the EGR was 0% to 25%. The combustion efficiency was close to 100% when the BMEP was >3 bar.

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Section: Engine Performancesmentioning

confidence: 95%

Combustion Analysis of Homogeneous Charge Compression Ignition in a Motorcycle Engine Using a Dual-Fuel with Exhaust Gas Recirculation

Jang

2019

Energies

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“…The exhaust emissions of this HCCI engine were discussed in previous research (Wu et al, 2015). The NO emission of HCCI is very small which is close to zero and the CO emission is also small as compared with the SI engine.…”

Section: Engine Operating Propertiesmentioning

confidence: 97%

“…Moreover, DME (CH 3 OCH 3 ) combustion is soot free, because it lacks double C-C bonds and contains oxygen atoms that oxidize intermediate soot product (Jang et al, 2013). An HCCI engine using a DME-gasoline dual fuel with EGR was demonstrated in a range-extended electric motorcycle (Wu et al, 2015). Hence, DME-gasoline dual fuel is an excellent choice for HCCI in small engines.…”

Section: Engine Operating Propertiesmentioning

confidence: 99%

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Experimental Study on HCCI Combustion in a Small Engine with Various Fuels and EGR

Chen

Wang

2016

Aerosol Air Qual. Res.

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Because Asian countries have a large number of motorcycles, motorcycle engine exhaust emission poses a major problem in the region. Homogeneous charge compression ignition (HCCI) is a promising combustion technology with high efficiency and low nitrogen oxide emission. This study investigated the combustion characteristics of HCCI in a 150 cc motorcycle engine with three types of dual fuel. The main fuels consisted of dimethyl ether (DME), kerosene, and nheptane, and gasoline was the additive fuel. External exhaust gas recirculation (EGR) was used to expand the operating range of the engine. All test points were executed under stable HCCI operation with a coefficient of variation < 5%. A total of 107 data sets were obtained by adjusting the amount of main fuel, additive fuel, and EGR. Two-stage ignition was observed because of the diesel-like main fuels. The results revealed that the temperature at the start of combustion was approximately 500-700 K, and the temperature of the first-stage maximum heat release rate (MHRR1) was approximately 600-800 K. The relationship between the crank angle (CA) at which the mass fraction burnt is 50% (CA50) and the CAs of the maximum cylinder pressure, maximum cylinder gas temperature, and MHRR were linear. The R square for the curve fitting of each relationship was > 0.9. The findings suggest that adjusting the CA50 to a value greater than 5° after top dead center, or limiting the maximum cylinder pressure to < 50 bar is crucial to preventing excessive pressure rising. Overall, kerosene was deemed unsuitable for engines because of its high sulfur content, whereas DME is considered an excellent option.

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Understanding of the asymmetric twin-stroll radial turbine under steady and pulsating inlet conditions

Wang,

Liu,

Wang

2024

Proceedings of the Institution of Mechanical Engineers, Part A:

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Utilize asymmetrical twin-scroll turbines (ATSTs) to achieve high-pressure exhaust gas recirculation (EGR) with a single scroll while optimizing the other scroll’s design for engine scavenging optimization. ATST performance prediction relies heavily on understanding the turbine flow mechanism, which always faces the challenge posed by time-dependent non-uniform intake. This paper studied its performance and flow field under steady and unsteady intake conditions for a production ATST. Firstly, the steady performance of the ATST with different asymmetries (ASYs) under different scroll pressure ratios (SPRs) is investigated via the computational fluid dynamics (CFD) method. Results demonstrate that the distribution relationship between SPR and turbine flow parameter (MFP) has a certain symmetry based on SPR = 1. For efficiency, the imbalance of inlet conditions will lead to the reduction of turbine efficiency. Moreover, the ASY has little effect on the turbine’s efficiency under the condition of SPR = 1. Also, the unsteady CFD simulations are conducted under pulsating inlet conditions with different scroll averaged pressure ratios (SAPRs). The results show that the highest efficiency was achieved at an ASY of 0.5 under a SAPR of 1.2 conditions, and the maximum, minimum, and average efficiencies were 1.9%, 1.5%, and 0.9% higher than those at an ASY of 0.83. The turbine’s flow field at the optimal incidence angle point is analyzed. The secondary flow vortex in the volute of an ASY of 0.5 is more robust, and the volute outlet ‘s total pressure loss is more significant. However, a relatively good incidence angle is obtained at the rotor inlet, and the loss in the rotor flow field is more minor. Therefore, the turbine efficiency with an ASY of 0.5 is higher.

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Application of HCCI Engine in Motorcycle for Emission Reduction and Energy Saving

Cited by 5 publications

References 27 publications

Combustion Analysis of Homogeneous Charge Compression Ignition in a Motorcycle Engine Using a Dual-Fuel with Exhaust Gas Recirculation

Combustion Analysis of Homogeneous Charge Compression Ignition in a Motorcycle Engine Using a Dual-Fuel with Exhaust Gas Recirculation

Experimental Study on HCCI Combustion in a Small Engine with Various Fuels and EGR

Understanding of the asymmetric twin-stroll radial turbine under steady and pulsating inlet conditions

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