Method and system for determining oxygen concentration of exhaust gas of engine

An oxygen concentration and engine technology, applied in engine control, machine/engine, electrical control, etc., can solve the problems of long measurement preparation time and achieve the effect of reducing requirements and low sensitivity

Active Publication Date: 2015-09-09
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the above method of detecting the oxygen concentration in the engine exhaust gas has disadvantages: the oxygen concentration sensor can only measure the oxygen concentration after being heated to about 700°C. Therefo

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  • Method and system for determining oxygen concentration of exhaust gas of engine
  • Method and system for determining oxygen concentration of exhaust gas of engine
  • Method and system for determining oxygen concentration of exhaust gas of engine

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Embodiment Construction

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0038]The invention discloses a method for determining the oxygen concentration in the exhaust gas of an engine. Based on the method, the oxygen concentration in the exhaust gas of the engine can be quickly determined after the motor vehicle is started.

[0039] see figure 1 , figure 1 It is a flowchart of a method for determining the oxygen concentration of engine exhaust gas disclosed in the present invention. The method includes:

[0040] Step S1: Calcul...

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Abstract

The invention discloses a method for determining oxygen concentration of exhaust gas of an engine. The method comprises the steps that firstly, the inflation efficiency of the engine, the rotating speed of the engine and the exhaust amount of the engine are utilized for calculating the total gas inlet mass flow of the engine, and then, the temperature of air entering the engine, temperature of the waste gas entering the engine, temperature of mixed gas entering the engine and the total air inlet mass flow of the engine are utilized for calculating the mass flow of air entering the engine and the mass flow of the waste gas entering the engine; on the basis of data, the oxygen concentration of the waste gas of the engine can be determined. According to the method for determining the oxygen concentration of the waste gas of the engine, after the engine is started, the oxygen concentration of the waste gas in the engine can be rapidly determined, sensibility of a pipeline structure is reduced, so that the requirement of pipeline layout of the engine can be reduced. The invention further discloses a system for determining the oxygen concentration of the exhaust gas of the engine.

Description

technical field [0001] The invention belongs to the technical field of gas detection, in particular to a method and a system for determining the oxygen concentration of engine exhaust gas. Background technique [0002] Motor vehicles will emit a large amount of nitrogen oxides (such as NO and NO2) during operation, and nitrogen oxides are generated under high-temperature and oxygen-enriched conditions. In order to reduce the content of nitrogen oxides in the exhaust of motor vehicles, an exhaust gas recirculation (EGR) system has appeared: part of the exhaust gas emitted by the engine is introduced into the intake pipe of the engine, and the exhaust gas is mixed with air and then enters the cylinder of the engine. Reduce the temperature and oxygen content in the cylinder, thereby reducing the content of nitrogen oxides in the exhaust. [0003] In order to ensure the power performance of the engine, it is necessary to control an appropriate amount of exhaust gas to participa...

Claims

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Application Information

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IPC IPC(8): F02D41/00
Inventor 王堃张军唐蛟冯海浩王鹏飞
Owner WEICHAI POWER CO LTD
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