Diming Lou's research while affiliated with Tongji University and other places
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Publications (120)
The effects of ash and sulfur content on the morphology of particulate matter (PM) in diesel particle filter (DPF) were investigated with five different components of lubricants. The aggregate morphology of primary particles in diesel were analyzed using transmission electron microscopy (TEM). The fractal dimensions of carbon particles were calcula...
The waste-cooking-oil biodiesel is proven to be a clean alternative fuel, its effect on the vehicle emissions at different driving conditions needs further quantitative evaluation, especially with the exhaust after-treatment. The objective of this study is to quantify the effect of waste-cooking-oil biodiesel on the gaseous and particulate emission...
The combination of diesel oxidation catalyst (DOC), catalyzed diesel particulate filter (CDPF) and selective catalytic reduction (SCR) is the most effective way to reduce particulate emission and nitrogen oxide (NOx) from diesel engines. In this study, the effects of a DOC+CDPF+SCR system on the emissions including carbon monoxide (CO) total hydroc...
Catalyzed Diesel Particulate Filter (CDPF) provides an efficient method for removing particulate matter emissions to meet stringent soot emission legislation for diesel engines. In order to clarify the temperature and pressure characteristics of CDPF during the soot loading and regeneration process, in this study, a self-defined transient cycle is...
Alternative fuels have gained considerable attention because of their excellent sustainable energy conservation and emission reduction characteristics. In this study, emission characteristics and fuel economy of three alternative fuels were compared for a passenger car under real-world running conditions. Specifically, the portable emission measure...
The emissions of pollutants from inland ships endanger the urban environment and human health, deserving quantitative study to make reduction measurements to achieve clean emissions. In this study, the real-world gaseous emissions (CO, THC, SO2, NOx) and particulate emissions including particle mass (PM) and particle number (PN) as well as the part...
In this study, the effect of new and used catalyzed diesel particulate filter (CDPF) with different catalyst loadings on the particulate emissions including the particle mass (PM), particle number (PN), particle size distribution (PSD) and geometric mean diameter (GMD) from a diesel vehicle were investigated based on a heavy chassis dynamometer. Re...
Different from vehicle engines, Diesel Particulate Filter (DPF) inactivation is an unavoidable issue for low-speed marine diesel engines fueled with Heavy Fuel Oil (HFO). This paper introduced a sulfur resisting material in Silicon Carbide (SiC)-DPF to improve DPF performance. The results of bench-scale experiments showed that the Balance Point Tem...
Shipping emissions have aroused wide concern in the world. In order to promote the implementation of emission regulations, this study develop a ship based sniffing technique to perform remote measurement of the SO 2 , NO x and CO 2 from ships entering and leaving Shanghai port at the open sea. The ship emission prediction model, Smoke diffusion mod...
Non-precious metal catalysts with good soot catalytic properties and a low cost have great potential for application in diesel particulate filters (DPF). In this study, we compared the effects of DPF supported by Cs2V4O11 (Cs-V-based) non-precious metal catalysts and conventional Pt-Pd-based precious metal catalysts on the performance of a non-road...
To improve the performance of predictive energy management strategies for hybrid passenger vehicles, this paper proposes an Encoder–Decoder (ED)-based velocity prediction modelling system coupled with driving pattern recognition. Firstly, the driving pattern recognition (DPR) model is established by a K-means clustering algorithm and validated on t...
Biodiesel is one of carbon neutral fuels for diesel engine and waste cooking oil (WCO) would be the most viable source for biodiesel production in China. This paper studied the micromorphology, nanostructure, surface functional group composition, and oxidation activity characteristics of particles emitted from a China V bus fueled by pure WCO biodi...
Exhaust gas recirculation (EGR) and selective catalytic reduction (SCR) have become important technologies to reduce the NO x emission of heavy-duty diesel engines and meet the increasingly stringent emission regulations. This paper studied the effect of EGR combined with SCR on the NO x emission characteristics of a heavy-duty diesel engine based...
Gasoline particulate filter (GPF) is one of the most important means to solve particle emissions of gasoline direct injection (GDI) engines in the present and the future. In order to provide a theoretical guidance for the regeneration control and improvement of GPF, this paper analyzes the oxidation activity and surface functional group of particul...
The effects of injection pressure and injection timing are investigated in a gasoline direct injection engine with a 50 MPa injection system at part-load operating condition by experimental methods. The engine was invariably operated in stoichiometric air/fuel ratio, 1500 r/min engine speed and 5–15 bar break mean effective pressure (BMEP). The cha...
This paper designed a fuzzy adaptive proportional integral differential (PID) control algorithm to optimize the overshoot of speed and torque, fuel consumption and exhaust emissions of the traditional PID control strategy in the process of working condition switching of an extended range electric vehicle. The simulation was carried out in Matlab/Si...
The application of turbocharged inter-cooler DI diesel engine in large diesel vehicle transportation and construction machinery will be indispensable for a long time in the future. The extreme condition of the plateau has become a hotspot in the research of diesel combustion. When the diesel engine work on the cold-start or low-load / low-speed con...
Biodiesel is a promising clean and alternative fuel that can meet the demand of energy saving and environmental protection. In this study, the effects of biodiesel blends on the gaseous and particulate emission characteristics of China-III, IV, and V urban buses were investigated based on a heavy chassis dynamometer. The results showed that the bio...
In this study, the effects of a diesel oxidation catalyst (DOC) coupled with a catalyzed diesel particulate filter (CDPF) with different catalyst loadings on the power, fuel consumption, gaseous and particulate emissions from a non-road diesel engine were investigated. Results showed that the after-treatment had a negligible effect on the power and...
The filtration efficiencies of the particulate matter and the particulate number in DPF, the no-load pressure drop of DPF, and the load pressure drop of DPF were selected as key performance parameters of DPF. The influence of the cell density and the wall thickness of the DPF on these key performance parameters of DPF was studied in detail. Firstly...
The exhaust gas pollutants of the non-road vehicles are harmful to the environment. Many non-road vehicles meet the requirements of the regulations in the laboratory. However, the real-road emissions of such vehicles are sometimes higher. Measuring the real-road emissions of non-road vehicles is very important. The real-road emissions are measured...
Exhaust gas recirculation (EGR) can improve the fuel economy of gasoline direct-injection (GDI) engines, but at the same time it will have a significant impact on emissions. In this paper, the effects of low-pressure exhaust gas recirculation (LP-EGR) and its rate on the main gaseous and particulate emission characteristic of a GDI engine were inve...
The real-world gaseous and particulate emission characteristics of an agricultural tractor retrofitted with a catalysed diesel particulate filter (CDPF) with different catalyst loadings were investigated. The tests were carried out using a portable emission measurement system (PEMS) under idling, running and working conditions. The results showed t...
The thermal insulation performance of exhaust pipes coated with various materials (basalt and glass fiber materials) under different braiding forms (sleeve, winding and felt types) and the effects on the emission characteristics of diesel engines were experimentally studied through engine bench tests. The results indicated that the thermal insulati...
The Corun hybrid system (CHS) is a deeply coupled multiple-input–multiple-output (MIMO) hybrid system. The two inputs are the torques of the two motors. The two outputs are the carrier speed and transmission output torque. Using the traditional control method, the multi-objective control quality cannot be guaranteed because of the adopted static de...
Fuel consumption is the most important parameter that characterizes the fuel economy of the engines. Instead of manual fuel consumption calibration based on the experience of engineers, the establishment of a fuel consumption model greatly reduces the time and cost of multiparameter calibration and optimization of modern engines and realizes the fu...
Range extended electric vehicles (REEVs), transition vehicles between combustion engine vehicles and electric vehicles, have been widely used due to their advantages of low fuel consumption and low emissions. By optimizing power management and after-treatment system control strategies, it is possible to achieve lower fuel consumption and emissions....
For a compound power split hybrid system, such as the Corun hybrid system (CHS), a frequently encountered problem is determining how to compensate for the inertia torque of the transmission via the torque distribution of the two motors. The equivalent inertia of the transmission is variable and depends on the angular acceleration. According to the...
Biodiesel is a promising alternative clean fuel for vehicles. In this paper, comprehensive particulate characteristics, including the particle number (PN), particle mass (PM), particle size distribution, particle micromorphology, chemical functional groups and particle oxidation activity from biodiesel blend B20 (20% biodiesel and 80% diesel by vol...
In this study, six different three-way catalysts were tested based on the engine bench to investigate the effect of platinum group metal (PGM) loadings and ratios of the catalysts on the transient emission characteristics of a heavy-duty natural gas engine. From the results of this study, NOx are the most important emissions to be considered when o...
This study involved conducting an experimental and numerical investigation on the effects of the air-to-fuel ratio (AFR), engine speed, and engine load on the inlet gas component of a three-way catalyst (TWC) and on the effects of noble metal loading, noble metal ratio, and carrier pore density on the emission conversion efficiency. The results sho...
In this paper, the visualization experiments of spray, ignition, and combustion of diesel under variable injection pressure (from 90 to 130 MPa) were studied by using a constant volume vessel and impinging combustion plate system. With the development of the down-sizing of diesel engines, the wall impinging combustion without liquid spray collision...
This paper involved conducting an experimental investigation on the effects of exhaust gas recirculation (EGR) and spark timing on the combustion, performance, and emission characteristics of a China-VI heavy-duty, natural gas engine fueled with high-methane content. The results showed that increasing the EGR rate extends the spark timing range and...
The elementary research of spray and combustion is of great significance to the development of compactness of modern diesel engines. In this paper, three injectors with different nozzle orifice diameters (0.23 mm, 0.27 mm and 0.31 mm) were used to study the diesel spray, ignition and flame-wall impingement visualization experiment. This paper studi...
This study involved conducting an experimental and numerical investigation on the effects of the air-to-fuel ratio (AFR), engine speed, and engine load on the inlet gas component of a three-way catalyst (TWC) and on the effects of noble metal loading, noble metal ratio, and carrier pore density on the emission conversion efficiency. The results sho...
An insufficient amount of NH3 (ammonia) will reduce the conversion efficiency of NOx, which may lead to excess NOx emissions, resulting in NH3-SCR failure. In this article, SCR failure caused by a low NH3- NOx ratio is studied systematically by experiments. The main reasons for a low NH3-NOx ratio in SCR include insufficient urea injection, hydroth...
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Based on the principle of corona discharge and electrostatic adsorption, an electric diesel particulate trap (EDPT) with high-voltage negative corona electrode structure was designed. The effect of EDPT on particulate emission characteristics of light-duty diesel engine was investigated based on engine bench test platform. The results show that at...
This contribution is focused on the fuel economy improvement of the Miller cycle under part-load characteristics on a supercharged DI (Direct Injection) gasoline engine. Firstly, based on the engine bench test, the effects with the Miller cycle application under 3000 rpm were studied. The results show that the Miller cycle has different extents of...
A novel multimode power-split hybrid electric vehicle demonstrates significant advantages in energy conservation. The complicated structure and multiple operation modes, however, have brought significant challenges to energy management. The problems of operation mode selection, power allocation, and operating point selection need to be solved simul...
With increasingly stringent emission regulations, the cold start emissions have become more important than ever. Using a low compression ratio is a feasible way to improve a heavy-duty engine’s efficiency and emissions. However, cold start performance restricts the development of this technology, especially at high altitudes. In response, we conduc...
A comparative experiment was conducted based on a non-road diesel engine to investigate the effects of two after-treatment devices on the engine’s emission characteristics as well as their power and fuel consumption performances. The first after-treatment device is a combination of a diesel oxidation catalyst (DOC) and a catalytic diesel particulat...
This paper investigates the cold start characteristic of the polymer electrolyte membrane fuel cell stack in the constant voltage startup mode. The stack is used in actual vehicle working conditions, so it is practical significance to study the cold start characteristics of the stack. The evolution of the temperature and current density distributio...
The primary purpose of this study was to investigate the effect of a catalyzed continuously regenerating trap (CCRT)system composed of a diesel oxidation catalyst (DOC)and a catalyzed diesel particulate filter (CDPF)on the main gaseous and particulate emissions from an urban diesel bus, as well as the durability performance of the CCRT system. Expe...
The primary purpose of this study is to evaluate effects of waste-cooking-oil biodiesel on the particle number (PN), size distribution and particulate-phase compositions including organic carbon (OC), elemental carbon (EC), polycyclic aromatic hydrocarbons (PAHs), N-alkanes, fatty acids and inorganic ions from a diesel bus. Experiments were conduct...
Based on the China Ⅵ emissions bench test of a heavy-duty diesel engine, different carrier structures of diesel oxidation catalytic (DOC) were studied for their impacts on the emission characteristics of an engine equipped with DOC and catalyzed diesel particulate filter (CDPF) after-treatment system. The results show that different DOC carrier str...
A Portable Emission Measurement System was used in this study to evaluate the exhaust emission characteristics of nitrogen oxides (NOx), ultrafine particulate matter (PM), and ultrafine particulate number (PN) from buses in the Yangtze River Delta, China. Results showed that NOx emission factor (unit: g·km⁻¹) increased from 5.0 to 19.1, and PM emis...
The purification performance and deterioration rule of catalyzed diesel particulate filter (CDPF) with different precious metal load (25g·ft-3, 20g·ft-3, 10g·ft-3) on the exhaust emissions of bus was studied and analyzed based on portable emission measurement system. The results show that the more of the precious metal load on the CDPF, the better...
Aimed at the numerical simulation of the mixed mechanism of oil and gas in the cylinder under the condition of high altitude, the paper analyzes the average pressure, the average temperature of the cylinder, the average diameter of the oil pan at different altitudes. The results show that with the increase of altitude, the intake air volume of the...
The purification performance and deterioration rule of catalyzed diesel particulate filter (CDPF) with different precious metal loads (25, 20, 10 g·ft⁻³) on the exhaust emissions of bus was studied and analyzed based on portable emission measurement system(PEMS). The results show that the more the precious metal load on CDPF, the better the purific...
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Nowadays, the performances of diesel engines under transient conditions become the research focus. Because of the frequent start and stop of the series hybrid diesel engine, the diesel engine is always in the steady state or idle speed switching state. In order to study the transient performance of diesel engine during the idle transient conditions...
The effects of variable geometry turbine (VGT)/exhaust gas recirculation (EGR) on pressure ratio, air-fuel ratio, specific fuel consumption, and emissions of NOx, CO, HC, CO2 and smoke from a heavy duty diesel engine have been investigated. The results show that pressure ratio and air-fuel ratio decrease, and fuel economy deteriorates with the incr...
A national V emission high pressure common-rail diesel engine filled with 20% biodiesel-diesel blends was optimized by adjusting the 6 injection parameters(Pfin, Tfin, Tint, Qpre, Tinta, Qafter). A multi-factor global optimization plan was designed by using hybrid Design of Experiment (DoE). 9 different operating points with different speeds and to...
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An electronic control,common rail heavy-duty diesel engine was used to study the particle number emissions during cold start(the coolant temperature is 24℃)and warm start(the coolant temperature is 80℃)operating conditions.Size distributions of particle number show an unimodal distribution,with the peak value of nucleation mode particle number betw...
Gas to liquid(GTL) diesel and biodiesel fuels are promising alternative fuels for diesel engines. A high pressure common rail diesel engine was used as an experimental engine, and pure diesel fuel, pure GTL diesel and pure biodiesel fuel were compared for engine performance and emission. Compared with pure biodiesel fuel, the fuel consumption of th...
The characteristics of particulate matter and gaseous emission from a China-IV diesel bus burning diesel and biodiesel with 5% blend ratio were tested on heavy chassis dynamometer under China City Bus Driving Cycle (CCBC). The results indicated that the bus working condition under CCBC is mainly during 900~1100 r·min-1 and 200~500 N·m, which shows...
A high-pressure common rail engine was tested. The effects of DOC+DPF after-treatment on physical and chemical characteristics of PM were analyzed when the engine was fueled with BD20. Results show that the number concentration of accumulation mode particles decreases by 99.4%, when DOC+DPF is adopted, while the decrease rate of nucleation mode par...
The emission of nitrogen-containing compound from a heavy-duty diesel engine with selective catalytic reduction (SCR) was studied by using Fourier transform infrared spectrum (FTIR) technology. The main emitted nitrogen-containing compounds including NO, NO2 and N2O under different operating conditions were analyzed. The results showed that the NO...