在超薄燃料汽车SI发动机中NOx/N2形成和协调的尿素-SCR控制:发动机映射和WLTC战略评估
Jiwen Jiang1, Jingjiang Yang2, Yong Cheng3
1School of Automotive Technology, Anhui Vocational College of Defense Technology, Lu'an 237011, China.
ACS omega
|March 2, 2026
概括
在引擎中实现高效率和低NOx排放是可能的. 超薄燃烧和选择性催化还原 (SCR) 系统的协调控制符合严格的法规.
科学领域:
- 汽车工程 汽车工程
- 内部燃烧发动机 内部燃烧发动机
- 环境科学 环境科学
背景情况:
- 气发动机为减少碳排放提供了一条道路.
- 像中国6b这样的严格法规要求高效率和低氧化物 (NOx) 排放.
- 在引擎中同时优化这些参数是一个重大挑战.
研究的目的:
- 研究用于燃料汽车发动机的高效率和低NOx排放的策略.
- 评估选择性催化降解 (SCR) 后处理对NOx减排的性能.
- 根据中国6b条例,比较不同的运营策略.
主要方法:
- 四直喷火花点火发动机和SCR系统的实验测试.
- 获取各种速度和负载的制动热效率 (BTE) 和NOx数据.
- 开发和模拟世界协调轻型车辆测试周期 (WLTC) 车辆模型.
主要成果:
- 超薄燃烧 (多余空气比 λ = 2.4-3.0) 在低/中等负载下实现了最高43%的BTE,低原始NOx.
- 在最佳条件下,SCR系统显示了近100%的NOx转换效率 (NH3/NOx比率1.1-1.3).
- 以经济和低NOx为导向的战略都实现了WLTC排气管NOx低于35毫克/公里,经济战略显示了更低的消耗.
结论:
- 协调控制超薄燃烧和高效的SCR后处理是一种可行的方法.
- 这一综合战略使汽车发动机的高效,低NOx运行成为可能.
- 这些发现支持开发符合严格排放标准的更清洁的汽车技术.
相关概念视频
Turnover Number and Catalytic Efficiency
21.8K
The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
21.8K
Aldehydes and Ketones to Alkanes: Wolff–Kishner Reduction
5.9K
Wolff–Kishner reduction involves converting aldehydes and ketones to alkanes using hydrazine and a base. The reaction converts a carbonyl group to a methylene group. The method was independently discovered by N. Kishner in 1911 and L. Wolff in 1912. The reduction is carried out in high-boiling solvents such as ethylene glycol and diethylene glycol because heat is required to deprotonate the N–H proton in one of the reaction steps. ...
5.9K
Internal Combustion Engine
2.9K
The internal combustion engine is a heat engine that uses the byproducts of combustion as the working fluid instead of using a heat transfer medium to transfer heat. The combustion is done in a way that produces high-pressure combustion products that can be expanded through a turbine or piston to create work. Internal combustion engines can again be categorized into three kinds: (1) spark ignition gasoline engines, most commonly used in automobiles, (2) compression ignition diesel engines that...
2.9K
Otto and Diesel Cycle
4.1K
An Otto engine is a four-stroke engine that uses a mixture of gasoline and air as the working fuel. The fuel is injected into the cylinder, and the piston is moved completely down so that the cylinder is at maximum volume. By moving the piston up, adiabatic compression takes place. The spark plug ignites the gasoline-air mixture, and the burning fuel adds heat to the system at a constant volume. The heated mixture expands adiabatically and gets further cooled by exhausting heat, and this cyclic...
4.1K
Heterogeneous Catalysis
9
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
9
Catalysis
31.1K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
31.1K


