Adaptive control method and system for selective reduction catalyst

Abstract

The invention provides a self-adaptation control method and system for a selective reduction catalyst. The self-adaptation control method for the selective reduction catalyst comprises the following steps that a piece of vehicle driving state information is extracted and comprises an accelerator opening degree, an engine rotating speed and a nitric oxide concentration; the vehicle driving state information is accumulated, and an injection reference table is built; the vehicle driving state information and the injection reference table are compared, and a piece of urea injection information is transmitted outwards; and urea is injected, and urea injection is controlled to conform to the urea injection information. The system can be additionally mounted on a diesel vehicle which is provided with no selective reduction catalyst system when leaving a factory, complex electronic connection or parameter adjusting with an engine electronic control unit is not needed, and therefore the mounting cost and time can be greatly reduced.

Description

Technical field [0001] The present invention is a selective catalyst reduction control method and system, in particular an adaptive control method and system of selective reduction catalyst that can be applied to various diesel vehicles. Background technique [0002] In recent years, due to the rise of environmental protection awareness and carbon reduction campaigns, the concentration of carbon oxides, hydrocarbons, and suspended particulates in the air has decreased significantly in domestic and foreign research, but only nitrogen oxides have shown an increasing trend. The phenomenon should be related to the massive use of diesel. In order to reduce nitrogen oxide emissions, the European Union and most countries have clearly stipulated that new diesel vehicles must be installed with selective reduction catalyst systems (SCR) to reduce nitrogen oxide emissions. However, there are no strong regulations for diesel vehicles that are already in use, and these vehicles are currently...

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Problems solved by technology

[0004] However, the selective reduction catalyst system that can be installed above cannot be connected with the engine electronic control unit. In addition, the car manufacturer itself is unwilling to disclose the setting parameters of the electronic control unit, so the injection reference can only be established according to the single engine test. surface

And this kind of test often requires the engine to be removed from the frame for testing, and the injection reference table will be changed due to the design of diesel engines of various car manufacturers, so the injection reference table cannot be applied to all types of vehicles.

This type of test is not only time-consuming, labor-intensive, but also requires high costs. Most users are unwilling to carry out this type of installation operation, which leads to the continuous increase in the concentration of nitrogen oxides in the air

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