SCR thermal management system based on 48V micro hybrid power system and energy-saving priority control method

Abstract

The invention discloses an SCR thermal management system based on a 48V micro hybrid power system and an energy-saving priority control method thereof. The SCR thermal management system comprises a vehicle control unit connected with a battery with 48V voltage, wherein the vehicle control unit is used for evaluating the condition of a vehicle, calculating the energy required for driving, distributing the energy of the battery and issuing a work instruction; the vehicle control unit is electrically connected with an SCR post-processing device control unit; and the SCR post-processing control unit controls the start or stop of heating elements in the SCR post-processing device according to the work instruction. Based on the SCR thermal management system, the energy of the battery is effectively distributed according to the energy required by the vehicle to ensure the service life of the battery, and a power system of the vehicle and SCR heating can both obtain the required energy and make full use of electric energy so that the economy of the whole vehicle can be guaranteed, the reaction temperature of the SCR post-processing device is guaranteed, and the treatment effect is improved. In addition, the crystallization risk of the SCR post-processing device is eliminated, and the use effect of the SCR post-processing device is guaranteed.

Description

technical field [0001] The invention relates to the technical field of automobile control, in particular to an SCR thermal management system based on a 48V weak hybrid system. The present invention also relates to an energy-saving priority control method including the SCR thermal management system based on the 48V weak hybrid system. Background technique [0002] With the gradual depletion of primary energy and the deteriorating environment, gasoline-electric hybrid vehicles with excellent energy-saving and emission-reduction performance have gradually become the development trend of the automobile industry today. The country's emission requirements for diesel engines are becoming more and more stringent, and the pollutants emitted, especially nitrogen oxides, are the key indicators for reduction. In the prior art, after-treatment technology is used to reduce NO X It is treated to reduce to nitrogen, thereby reducing the content of nitrogen oxides. The most direct method i...

AI Technical Summary

Problems solved by technology

Generally, the temperature of the catalytic converter is required to be at least 180°C. When the temperature reaches about 300°C, it will reach the non-linear region of activity. If the temperature is too low, it will not only reduce the efficiency of the catalyst, but also cause the crystallization of the urea solution and cause the catalytic system to fail.

[0004] At the same time, when the engine is in the low-load area, the exhaust temperature is too low, and the SCR is difficult to work, resulting in the emission not meeting the standard

In order to solve the above problems, the method of reducing the excess air coefficient to increase the exhaust temperature is generally adopted, that is, to increase the fuel injection volume, but at the same time lead to the problem of poor economy; the vehicle power supply system can also be used to heat the SCR post-processing device of the engine , so that the SCR catalytic converter is in the ideal temperature range, so as to effectively ensure the effective implementation of SCR, but due to the limitations of the vehicle's own battery energy and other factors, the effective distribution of electric energy cannot be realized, and it is easy to cause the battery to be scrapped, affecting the normal driving and operation of the vehicle. SCR treatment effect

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