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There is increasing demand for the on-board diagnosis of lubricating oils. In this research, we consider various sensor principles for on-board diagnosis of the thermal aging of engine oils. One of the parameters investigated is the viscosity of the lubricating oil, which can be efficiently measured using a microacoustic sensor. Compared with conventional viscometers, these sensors probe a different rheological domain, which needs to be considered in the interpretation of measurement results. This specific behavior is examined by systematically investigating engine oils, with and without additive packages, that were subjected to a defined artificial aging process. This paper presents design strategies for the algorithm developed and applied for direct on-board diagnosis of engine oil conditions with a fluid property sensor; this enables prediction of remaining oil life and optimization of oil change intervals, thereby minimizing the likelihood of dramatic engine failure and reducing maintenance costs. After a general description of the principles of sensor measurement, different engine oil contaminants, aging phenomena, and associated sensor detection and measurement capabilities are discussed.
Hao Sun; Yingshuai Liu; Jianwei Tan. Research on Testing Method of Oil Characteristic Based on Quartz Tuning Fork Sensor. Applied Sciences 2021, 11, 5642 .
AMA StyleHao Sun, Yingshuai Liu, Jianwei Tan. Research on Testing Method of Oil Characteristic Based on Quartz Tuning Fork Sensor. Applied Sciences. 2021; 11 (12):5642.
Chicago/Turabian StyleHao Sun; Yingshuai Liu; Jianwei Tan. 2021. "Research on Testing Method of Oil Characteristic Based on Quartz Tuning Fork Sensor." Applied Sciences 11, no. 12: 5642.
To solve the problems of low exhaust temperature NOx conversion efficiency of urea Selective Catalytic Reduction (SCR) and easy production of urea crystals during actual vehicle operation, this paper studies the effect of solid SCR on NOx emission on the engine bench. The experimental results show that for a solid SCR carrying the same reducing agent, its volume is only 1/3 the volume of urea SCR. When the exhaust temperature is 160°C, the NOx conversion efficiency of the solid SCR system can reach 40%. Based on the same ammonia-nitrogen ratio setting, the World Harmonized Steady Cycle (WHSC) NOx conversion efficiency is improved by 3.3%, and the World Harmonized Transient Cycle (WHTC) NOx conversion efficiency is increased by 4.5%. When the solid SCR injection temperature is reduced to 160°C, the NOx conversion efficiency is significantly improved, which is 9.7% and 15.5% higher than that of the 200°C solid SCR system and the urea SCR system, respectively, and the number of power base windows is between [0 20].The NOx emission of diesel vehicles matching the urea SCR system is significantly higher, reaching 2.38 and 1.73 times that of the solid SCR system with a starting temperature of 160°C and 200°C, respectively.
Yingshuai Liu; Jianwei Tan. Experimental Study on Solid SCR Technology to Reduce NOx Emissions from Diesel Engines. IEEE Access 2020, 8, 151106 -151115.
AMA StyleYingshuai Liu, Jianwei Tan. Experimental Study on Solid SCR Technology to Reduce NOx Emissions from Diesel Engines. IEEE Access. 2020; 8 (99):151106-151115.
Chicago/Turabian StyleYingshuai Liu; Jianwei Tan. 2020. "Experimental Study on Solid SCR Technology to Reduce NOx Emissions from Diesel Engines." IEEE Access 8, no. 99: 151106-151115.
With a continuous increase in vehicle ownership, vehicle emissions have become one of the main sources of air pollution in China. Serious air pollution is a great threat to human health and life. The China VI regulations, which adopt strict particulate matter (PM) and nitrogen oxide (NO x ) limitations, have been implemented. As one of the best technologies for measuring vehicle emissions, portable emission measurement systems (PEMSs) have gained attention. In this work, the characteristics of China VI heavy-duty vehicle emissions were investigated with a PEMS. The effects of road conditions on NOx, hydrocarbon (HC), carbon monoxide (CO), PM and particle number (PN) pollutants were analyzed based on distance-based emission factors. The results show that the gaseous pollutant levels of NO x , HC and CO for China VI vehicles are much lower than those for China V vehicles. The average distance-based emission factors of NOx CO and HC decreased by 88%, 98%, and 62.7%, respectively. Based on the power-based window method, the PEMS test results for NO x , HC and CO are 460 mg·(kWh) -1 , 192 mg·(kWh) -1 and 37.5 mg·(kWh) -1 , respectively. According to the PEMS tests, approximately 88%-95% of the particles are in the 10-100 nm class based on three typical operational modes, which represent approximately 0.08%-0.13% of the total particle mass. These heavy-duty vehicles can satisfy the requirements of the PEMS China VI standards. This study emphasizes the importance of obtaining real-world measurements of heavy-duty vehicles to improve the accuracy of emission factors in the development of emission inventories in China.
Yingshuai Liu; Jianwei Tan. Green Traffic-Oriented Heavy-Duty Vehicle Emission Characteristics of China VI Based on Portable Emission Measurement Systems. IEEE Access 2020, 8, 106639 -106647.
AMA StyleYingshuai Liu, Jianwei Tan. Green Traffic-Oriented Heavy-Duty Vehicle Emission Characteristics of China VI Based on Portable Emission Measurement Systems. IEEE Access. 2020; 8 ():106639-106647.
Chicago/Turabian StyleYingshuai Liu; Jianwei Tan. 2020. "Green Traffic-Oriented Heavy-Duty Vehicle Emission Characteristics of China VI Based on Portable Emission Measurement Systems." IEEE Access 8, no. : 106639-106647.