Research on Evaluation Methods for Particle Emission Levels of Retrofit DPF in Engineering Machinery

Abstract:

Many local governments currently require diesel-powered engineering machinery to be retrofitted with Diesel Particulate Filters (DPF) to reduce particle emissions. However, some machinery users remove or damage the filter in DPF to reduce maintenance costs, resulting in direct emission of particles into the air in the exhaust gases. This study proposes a method of using portable emission equipment to directly measure exhaust particulate matter to accurately assess whether the DPF is functioning properly. A comparison of the emission characteristics of particulate number concentration under high and low idle conditions was conducted in the study, revealing that measuring PN under high idle conditions can accurately identify whether the DPF in the machinery is functioning normally. At the same time, a comparison was made between the PN test results under high and low idle conditions and the current free acceleration smoke test results. It was found that machinery using electronic control systems cannot use the free acceleration smoke method to identify whether the DPF in the machinery has been damaged.

• Periodical: Advances in Science and Technology (Volume 166)
• Pages: 77-82
• DOI: https://doi.org/10.4028/p-0KTLvB
• Online since: June 2025
• Authors: Juan Liu*, Yong Li, Jin Wang
• Keywords: Fast Testing, Free Acceleration Smoke, Identification of DPF Damage, Particle Number (PN)

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