  Gasoline vehicles and diesel vehicles use different fuel materials, and the engine structure, mixture formation method, and combustion method are different. The pollutant discharge law is also different. Performance in the following areas:
(1) Gasoline has a strong volatility, and diesel oil is very difficult to evaporate. Therefore, there are fuel evaporative emissions in gasoline vehicle pollutants. Its components are hydrocarbons (HC).
(2) Gasoline has the property of being easily mixed with air and difficult to separate after mixing. Gasoline fuel mixture is formed outside the combustion chamber of the engine [in the carburetor and/or intake pipe], before it is ignited, it undergoes intake and compression processes, and has a relatively long mixing time, so gasoline and air Can be mixed very evenly, there is basically no local over-concentration or too thin and liquid oil droplets, gasoline molecules are small, which determines the emission of gasoline in gasoline vehicles less. The ratio of air to gasoline entering the engine's combustion chamber is basically controlled near the stoichiometric air-fuel ratio (the so-called theoretical air-fuel ratio refers to the amount of air required to burn 1 kg of fuel on theoretical calculations, usually about 14.7 for gasoline). The use of spark plug ignition ignition combustion, burning speed; gasoline engine compression ratio is low, the maximum combustion pressure is low, the maximum temperature is high, the tendency of the product after burning high temperature dissociation is more serious, some dead spots do not catch fire or in certain conditions Under fire, there are more carbon monoxide (CO) and hydrocarbon (HC) emissions in the gasoline engine. At the same time, high temperatures exist in the combustion chamber of the engine, which in turn leads to the production and emission of nitrogen oxides (NO). Therefore, gasoline vehicle emissions are characterized by carbon monoxide (CO), hydrocarbon (HC) emissions are low, and particulate emissions are low. Nitrogen oxides (NO) emissions are basically the same as diesel vehicles (see Table 1-1).
(3) The diesel fuel mixture is formed in the combustion chamber of the engine. The diesel high pressure sprays the combustion chamber. After the ignition, the combustion is carried out by means of a diffusion combustion method that burns while spraying. This kind of working method determines that the mixing of diesel and air is not uniform and that there is inevitably a partial or partial oxygen enrichment. When the oil is oxygen-deficient at high temperatures, it is easily carbonized to form soot. The adjustment of diesel vehicle load is controlled by changing the fuel injection bin. Diesel engine sticks are always in a relatively lean state, which means that there is always surplus air in the combustion chamber of the diesel engine. These surplus air easily generate nitrogen oxides (NO) under the effect of high temperature, while carbon monoxide (CO) and hydrocarbons (HC) are not easily formed. Therefore, diesel vehicles are characterized by emissions of particulate matter and nitrogen oxides (NO), but low emissions of carbon monoxide (CO) and hydrocarbons (HC) (see Table 1).
In addition, diesel produces some odorous organic gases after combustion, therefore. There is odor in the diesel engine emissions.
(1) Gasoline has a strong volatility, and diesel oil is very difficult to evaporate. Therefore, there are fuel evaporative emissions in gasoline vehicle pollutants. Its components are hydrocarbons (HC).
(2) Gasoline has the property of being easily mixed with air and difficult to separate after mixing. Gasoline fuel mixture is formed outside the combustion chamber of the engine [in the carburetor and/or intake pipe], before it is ignited, it undergoes intake and compression processes, and has a relatively long mixing time, so gasoline and air Can be mixed very evenly, there is basically no local over-concentration or too thin and liquid oil droplets, gasoline molecules are small, which determines the emission of gasoline in gasoline vehicles less. The ratio of air to gasoline entering the engine's combustion chamber is basically controlled near the stoichiometric air-fuel ratio (the so-called theoretical air-fuel ratio refers to the amount of air required to burn 1 kg of fuel on theoretical calculations, usually about 14.7 for gasoline). The use of spark plug ignition ignition combustion, burning speed; gasoline engine compression ratio is low, the maximum combustion pressure is low, the maximum temperature is high, the tendency of the product after burning high temperature dissociation is more serious, some dead spots do not catch fire or in certain conditions Under fire, there are more carbon monoxide (CO) and hydrocarbon (HC) emissions in the gasoline engine. At the same time, high temperatures exist in the combustion chamber of the engine, which in turn leads to the production and emission of nitrogen oxides (NO). Therefore, gasoline vehicle emissions are characterized by carbon monoxide (CO), hydrocarbon (HC) emissions are low, and particulate emissions are low. Nitrogen oxides (NO) emissions are basically the same as diesel vehicles (see Table 1-1).
(3) The diesel fuel mixture is formed in the combustion chamber of the engine. The diesel high pressure sprays the combustion chamber. After the ignition, the combustion is carried out by means of a diffusion combustion method that burns while spraying. This kind of working method determines that the mixing of diesel and air is not uniform and that there is inevitably a partial or partial oxygen enrichment. When the oil is oxygen-deficient at high temperatures, it is easily carbonized to form soot. The adjustment of diesel vehicle load is controlled by changing the fuel injection bin. Diesel engine sticks are always in a relatively lean state, which means that there is always surplus air in the combustion chamber of the diesel engine. These surplus air easily generate nitrogen oxides (NO) under the effect of high temperature, while carbon monoxide (CO) and hydrocarbons (HC) are not easily formed. Therefore, diesel vehicles are characterized by emissions of particulate matter and nitrogen oxides (NO), but low emissions of carbon monoxide (CO) and hydrocarbons (HC) (see Table 1).
In addition, diesel produces some odorous organic gases after combustion, therefore. There is odor in the diesel engine emissions.
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