Calibration method of gasoline engine particulate matter model under low-temperature environment

Abstract

The invention discloses a calibration method of a gasoline engine particulate matter model under low-temperature environment. The method comprises the following steps that firstly, a brand-new particulate trap is arranged on a vehicle in a replacement manner; secondly, vehicle calibration is set; thirdly, a differential pressure transducer is started, and value of the differential pressure transducer is recorded; fourthly, vehicle calibration is set; fifthly, an accelerated accumulation particulate matter test is done; sixthly, the newly-added particulate matter is weighed; seventhly, particulate matter estimated model value is compared; eighthly, the steps from the second to the seventh are repeated, and the corresponding particulate matter estimated model value is adjusted; ninthly, whenthe weight of the newly-added particulate matter exceeds the active regeneration limit value of the particulate trap, the vehicle calibration is set again, and under the heat engine state, the particulate matter test is done; tenthly, the value of the differential pressure transducer and the particulate matter ash weight are recorded; eleventhly, the steps from the second to the tenth are repeated, and adjusting and matching of the particulate matter estimated model under different ash weights and different loads can be finished. Particulate matter model matching under the low-temperature environment can be achieved, and cost is reduced.

Description

technical field [0001] The invention relates to the field of automobile control, in particular to a method for calibrating a gasoline engine particle model in a low-temperature environment. Background technique [0002] With the rapid development of my country's automobile industry and the rapid increase in car ownership, more and more people pay attention to the pollutants emitted by automobiles. Especially in recent years, particulate matter emitted by automobiles has become an important source of PM2.5 in my country's urban atmosphere. National emission regulations have imposed This is more stringent. [0003] The modern automobile industry has developed engine technologies such as direct injection, exhaust gas turbocharging, and variable valve phase, and direct injection (gasoline direct injection, GDI) is one of the representatives, which has low fuel consumption, low CO2 emissions, and improved engine performance. Dynamics and other advantages. However, due to the sho...

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Problems solved by technology

[0004] At present, for the calibration control of the particulate matter model of the gasoline engine particulate filter, the general method of various OEMs is to use long-term enrichment to accumulate particulate matter under the engine’s hot engine condition, so as to achieve the control of the gasoline engine particulate filter, but this consumes It takes a long time and the cost is high, especially for the low temperature environment. At present, there is no fast and effective calibration method for each OEM. In summary, a particulate matter model calibration method for low temperature environment is of great significance to the control of gasoline engine particulate filter

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