Secondary air supplementing device and engine

Abstract

The invention relates to a secondary air supplementing device and an engine. The secondary air supplementing device utilizes the time nonuniformity of the pollutant content in waste gas to timely supplement secondary air into an exhaust passage through an air supplementing pipe so as to improve the air supplementing effect; meanwhile, when an exhaust valve is opened or closed, the valve lift is small, so that the flow of waste gas in a combustion chamber entering the exhaust passage is small, the flow speed is low, the flow speed gradient of the waste gas on all cross sections in the exhaust passage is large, and more waste gas flows along the inner surface, farther away from the combustion chamber, of the exhaust passage. Therefore, according to the air supplementing device, an air outletis formed in the first pipe surface, so that the secondary air supplemented from the air supplementing pipe can be rapidly captured by more waste gas, the oxidation reaction of pollutants in the waste gas is accelerated, and the emission of the pollutants is effectively reduced, so that the secondary air can be supplemented in time and space through the air supplementing device, and the emissionof the pollutants in the waste gas is reduced.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a secondary air supply device and an engine. Background technique [0002] In order to reduce emissions and meet regulatory requirements, the fuel supply method of motor vehicles has gradually switched from carburetors to electronic fuel injection systems. Of course, carburetors are still reserved in some areas. However, regardless of the fuel supply method, there are open-loop fuel supply conditions (rich and lean mixtures cannot be fed back and adjusted in time), and the emission problems caused by these conditions cannot be ignored. Therefore, the secondary air supply system, on the one hand, as an effective device to reduce emissions, can make up for the shortcomings of EFI open-loop control, and on the other hand, can effectively reduce the emissions of the carburetor. [0003] The traditional secondary air supply system is limited by its own structure, resulting in a poor ...

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Problems solved by technology

[0003] The traditional secondary air supply system is limited by its own structure, resulting in a poor match between the secondary air supply system and the exhaust system, not only failing to supply fresh air into the exhaust system in time, but also sending more high-temperature exhaust The exhaust system leads to the secondary air supp

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