Exhaust purification device, exhaust purification control method and control system thereof
An exhaust purification device and exhaust purification technology, applied in exhaust devices, exhaust treatment, noise reduction devices, etc., can solve problems affecting the efficiency of PNA storage NOx, achieve the effect of improving storage efficiency and reducing NOx emissions
Active Publication Date: 2020-11-20
WEICHAI POWER CO LTD
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Problems solved by technology
[0005] In view of this, the present invention provides an exhaust purification device, an exhaust purification control method and a control device thereof to solve the problem in the prior art that the NOx storage efficiency of the PNA is affected by the exhaust gas temperature being too low or too high
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[0053] As mentioned in the background technology section, in the prior art, the storage efficiency of PNA is closely related to the exhaust gas temperature, and the exhaust gas temperature is too low or too high will affect the NOx storage efficiency of PNA. See figure 1 , figure 1 Schematic diagram of the curve of NOx storage efficiency of PNA as a function of temperature. There is a temperature at which the PNA reaches its peak NOx storage.
[0054] The inventors found that this is because the exhaust gas temperature is too low, the storage capacity of PNA is reduced, the quality of stored NOx is reduced, and the conversion efficiency of NOx is reduced; the exhaust gas temperature is too high, so that the temperature time for PNA to release NOx is reduced, and the storage efficiency of PNA is reduced. Reduced, the efficiency of NOx decreases.
[0055] Based on this, the present invention provides an exhaust purification control method, based on an exhaust purification dev...
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The invention relates to an exhaust purification device, an exhaust purification control method and a control device thereof. According to the exhaust purification device, a variable-power electric heater is additionally arranged at the front end of a PNA; and an ECU controls a variable air filter electric heater to heat exhaust gas according to test data of temperature sensors on the upstream andthe downstream of the PNA and controls the power of the variable-power electric heater, so that the temperature of the exhaust gas is continuously kept at the peak temperature of NOx stored in the PNA. Correspondingly, the exhaust purification control method comprises the steps of judging whether an engine is located at a cold start working condition or a low temperature working condition or not;if the engine is located at the cold start working condition or the low temperature working condition, judging whether the inner temperature of the PNA is smaller than the peak temperature of the NOxstored in the PNA or not; and if the inner temperature of the PNA is smaller than the peak temperature of the NOx stored in the PNA, indicating that the exhaust gas needs to be heat, and using the ECU for controlling the variable-power heater to heat the PNA, so that the inner temperature of the PNA is kept at the peak temperature of the NOx stored in the PNA, the storage efficiency of the PNA isfurther improved, and the NOx emission is reduced.
Description
technical field [0001] The invention relates to the technical field of diesel engine exhaust, in particular to an exhaust purification device, an exhaust purification control method and a control device thereof. Background technique [0002] Diesel engines are increasingly used in automobiles, and at the same time face the challenge of increasingly stringent emission regulations and lower emission limit values. With the tightening of emission regulations, it is necessary to further reduce NOx emissions so as to achieve ultra-low emissions. [0003] Existing post-treatment technologies for purifying NOx include low-temperature catalytic decomposition, selective catalytic reduction (SCR), lean NOx trapping (LNT), passive NOx adsorption (PNA, Passive NOx Adsorber) and low-temperature plasma technology, etc. Among them, the PNA absorbs and stores NOx during the engine cold start phase, until the exhaust gas temperature reaches the temperature at which the PNA can release the NO...
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IPC IPC(8): F01N3/08
CPCF01N3/0842F01N3/0871F01N2240/16
Inventor 吕志华孙婷文志永李耀仲昆
Owner WEICHAI POWER CO LTD