相关实验视频

Updated: Jul 26, 2025

Implementation of Portable Emissions Measurement Systems PEMS for the Real-driving Emissions RDE Regulation in Europe

Implementation of Portable Emissions Measurement Systems PEMS for the Real-driving Emissions RDE Regulation in Europe

Published on: December 4, 2016

现代重型柴油车的NOx排放恶化基于长期实际驾驶测量

Liqun Lyu¹, Zhongrui Ji², Hang Yin³

¹School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, China.

Environmental research

|June 16, 2023

概括

柴油车的氧化物排放量仍然低于限值,即使在20万公里之后. 选择性催化减排 (SCR) 的效率随着行驶里程的减少而下降,尤其是在低温下,这凸显了长期排放控制的挑战.

科学领域:

环境科学环境科学
汽车工程汽车工程
化学工程是化学工程的重要组成部分.

背景情况:

柴油车的氧化 (NOx) 排放是一个主要的环境问题.
发动机和后处理系统的磨损会随着车辆的行驶里程增加氧化物排放量.
中国-VI重型柴油车 (HDDV) 具有严格的排放标准.

研究的目的:

为了评估中国-VI HDDVs的长期NOx排放性能.
评估选择性催化减速 (SCR) 系统在延长里程的耐用性和效率.
确定影响HDDVsNOx排放控制的因素.

主要方法:

在三台中国-VI HDDV上进行了四阶段的长期真实驾驶排放 (RDE) 测试.
使用便携式排放测量系统 (PEMS) 来收集数据.
在20万公里的道路行驶后分析了NOx排放因子和SCR转换效率.

主要成果:

在20万公里后,最大NOx排放因子 (387.06 mg/kWh) 仍然低于中国-VI极限 (690 mg/kWh).
随着耐久性里程数的增加,SCR NOx转换效率几乎线性下降.
与高温 (275-400°C) 相比,在低温 (例如200°C) 时,SCR效率的恶化明显更高.
在250°C的SCR催化剂表现出强大的耐用性和效率.

结论:

虽然总体NOx排放可能仍然符合标准,但在低温下SCR效率下降对HDDV的长期NOx排放控制构成了挑战.
提高低温SCR性能对于催化剂优化至关重要.
环境当局应监测HDDV在低速度和负载时的NOx排放.

关键词:

重型柴油车辆重型柴油车辆重型柴油车辆氧化物排放的恶化小型电气系统 (PEMS) 是一个实际驾驶排放的排放量在SCR中,我们可以选择SCR.

更多相关视频

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

Automated, High-resolution Mobile Collection System for the Nitrogen Isotopic Analysis of NOx

Published on: December 20, 2016

Measuring Sub-23 Nanometer Real Driving Particle Number Emissions Using the Portable DownToTen Sampling System

Measuring Sub-23 Nanometer Real Driving Particle Number Emissions Using the Portable DownToTen Sampling System

Published on: May 22, 2020

相关概念视频

Turnover Number and Catalytic Efficiency

Turnover Number and Catalytic Efficiency

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....

Otto and Diesel Cycle

Otto and Diesel Cycle

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...

Internal Combustion Engine

Internal Combustion Engine

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...