Emission control method for cold start and warm-up of in-cylinder direct injection natural gas engine
An in-cylinder direct injection and emission control technology, applied in engine control, internal combustion piston engine, electrical control, etc., can solve the problems of low engine exhaust temperature, inability to ignite the processor, insufficient combustion, etc., and reduce cold start and the effect of warm-up emissions
Inactive Publication Date: 2017-02-22
UNIV OF JINAN
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[0004] However, the EuroⅥ emission engine adopts the WHTC test method, and it is necessary to test the transient emission when the engine is cold-started. Due to reasons such as wall quenching of the natural gas engine when the engine is cold-started, the combustion is likely to be insufficient. At the same time, the exhaust temperature of the engine is low during the cold start. The engine cannot be ignited, resulting in high hydrocarbon and carbon monoxide emissions when the natural gas engine is cold started, which cannot meet the requirements of Euro VI emission regulations
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[0026] In order to clearly illustrate the technical features of this solution, the present invention will be described in detail below through specific implementation modes and in conjunction with the accompanying drawings. The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. It should be noted that components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted herein to avoid unnecessarily limiting the...
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Provided are a control system and method for cold starting and warm-up emission of a direct injection natural gas engine. The system comprises an engine, a diesel oil supplying device, a natural gas supplying device, an engine electric control system, an engine postprocessor and a gas exhaust measurement device. A concentric double-axial-needle ejector communicated with the diesel oil supplying device and the natural gas supplying device is arranged on the engine, the engine postprocessor is arranged in a pipeline of an engine gas exhaust pipe, and the gas exhaust measurement device comprises a first gas exhaust temperature sensor, a second gas exhaust temperature sensor, a first wide range oxygen sensor and a second wide range oxygen sensor which are arranged in front of and behind the engine postprocessor. By means of the control system and method, the gas exhaust temperature of the engine is increased to reach the working temperature of the engine postprocessor; meanwhile, the air-fuel ratio is controlled to enable a catalyst to be quickly combusted after the engine is started; catalytic conversion is carried out on hydrocarbon and carbon monoxide in exhausted gas in the warn-up process, so that cold starting and warm-up emission of the engine meet the requirements of the Euro VI emission regulation.
Description
technical field [0001] The invention relates to an engine cold start and warm-up gas emission control device and method, in particular to a cold start and warm-up emission control system and method for an in-cylinder direct injection natural gas engine, which belongs to engine cold start and warm-up gas emission field of control technology. Background technique [0002] The need for energy saving and emission reduction has stimulated the development of alternative fuels for engines, new combustion technologies, and exhaust aftertreatment systems. With the maturity of shale gas commercial production technology, the share of natural gas in the energy market has increased, and the use of natural gas vehicles It has become one of the main technical means to control urban air pollution. [0003] Due to the limitation of knocking, traditional natural gas engines have lower power and thermal efficiency than diesel engines with the same displacement. Natural gas engines with in-cyl...
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IPC IPC(8): F02B69/04F02D41/30F02M43/04F01N11/00
CPCY02T10/40
Inventor 李娜张强
Owner UNIV OF JINAN