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SURP control device, method for adjusting nitrogen oxide conversion rate and automobile

A control device, nitrogen oxide technology, applied in electrical control, engine control, fuel injection control, etc., can solve the problem of increased LNT development cost, and achieve the effect of reducing CO2 output, openness, and low application cost

Active Publication Date: 2022-07-29
GREAT WALL MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, some LNT catalyst manufacturers use special catalyst formulations to solve the above problems, but switching catalyst formulations will increase the development cost of LNT

Method used

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  • SURP control device, method for adjusting nitrogen oxide conversion rate and automobile
  • SURP control device, method for adjusting nitrogen oxide conversion rate and automobile
  • SURP control device, method for adjusting nitrogen oxide conversion rate and automobile

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Experimental program
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Effect test

Embodiment approach

[0071] In this embodiment, the SURP control device is used to regulate the main injection quantity and main injection timing of the engine to reduce CO 2 The proportion of emissions in the exhaust gas, thereby reducing the CO in the exhaust gas 2 The effect on the conversion efficiency of LNT is to achieve the purpose of improving the conversion efficiency of LNT to NOx. The specific method for adjusting the nitrogen oxide conversion rate in the LNT is as follows:

[0072] The engine ECU control system monitors the current working state of the LNT, and when it is detected that the working state of the LNT is in the DeNOx state, the engine ECU control system performs the work of selecting the engine speed and engine torque. Among them, the range of engine speed selection points is 1200rpm-2800rpm, and the step size is 400rpm; the range of engine torque selection points is 50Nm to 300Nm, and the step size is 50Nm.

[0073] According to the above step size, the measured main in...

Embodiment 2

[0092] In this embodiment, the SURP control device is used to regulate the main injection quantity and main injection timing of the engine to reduce CO 2 The proportion of emissions in the exhaust gas, thereby reducing the CO in the exhaust gas 2 The effect on the conversion efficiency of LNT is to achieve the purpose of improving the conversion efficiency of LNT to NOx. The specific method for adjusting the nitrogen oxide conversion rate in the LNT is as follows:

[0093] The engine ECU control system monitors the current working state of the LNT, and when it is detected that the working state of the LNT is in the DeNOx state, the engine ECU control system performs the work of selecting the engine speed and engine torque. Among them, the range of engine speed selection points is 1200rpm-2800rpm, and the step size is 100rpm; the range of engine torque selection points is 50Nm to 300Nm, and the step size is 25Nm.

[0094] According to the above step size, the measured main in...

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Abstract

The invention provides an SURP control device, a method for adjusting the nitrogen oxide conversion rate and an automobile, and the SURP control device is used for controlling the emission ratio of CO2 in tail gas by adjusting and controlling the main fuel injection quantity and main injection timing of an engine so as to adjust the nitrogen oxide conversion rate in LNT. The method comprises the following steps: acquiring the emission ratio of CO2 in tail gas through an engine ECU (Electronic Control Unit), and judging whether the emission ratio is greater than or equal to a preset threshold value or not; when the discharge amount ratio is greater than / equal to a preset threshold value, starting the SURP control device; and the main fuel injection quantity and the main injection timing of the engine are adjusted through the SURP control device, so that the emission ratio of CO2 in tail gas is smaller than a preset threshold value, and the conversion efficiency of NOx in the LNT is further improved.

Description

technical field [0001] The invention belongs to the field of automobiles, and in particular relates to a SURP control device, a method for adjusting the conversion rate of nitrogen oxides, and an automobile. Background technique [0002] In the emission regulations of automobiles (National 6 emission regulations), NO X The emission limit is more stringent. Because the diesel engine is oxy-fuel combustion, the exhaust gas of the car contains a lot of NO X . Therefore, those skilled in the art are faced with reducing NO in exhaust gas as much as possible X content issue. [0003] In the prior art, in order to reduce NO X Those skilled in the art have developed LNT (Lean NOxTrap, lean-burn NOx trapping device) and successfully applied it in automobiles. Among them, LNT is mainly used for NOx capture and release, and NOx reduction, to achieve the purpose of purifying NOx. [0004] However, in the actual application of LNT, the CO present in the exhaust gas 2 It will redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/30F02D41/02
CPCF02D41/30F02D41/025
Inventor 刘世龙
Owner GREAT WALL MOTOR CO LTD
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