Dynamic monitoring of the flow rate of liquid additive injected into a motor vehicle exhaust gas treatment system
A technology of liquid additive and exhaust gas, which is applied in the direction of electronic control of exhaust gas treatment device, diagnosis device of exhaust gas treatment device, exhaust gas treatment, etc.
Active Publication Date: 2021-01-22
艾可蓝欧洲有限公司
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In other words, while the theoretical properties of pumps and injectors make it possible to estimate the flow of liquid additive delivered to the system at a given time and under given conditions, there is no way to ensure such an estimate at other times and under other circumstances the effectiveness of
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[0053] figure 1 A motor vehicle 101 is schematically shown with an internal combustion engine 102 , for example a diesel engine. Motor vehicle 101 is, for example, a passenger car, utility vehicle, truck or bus. The motor vehicle 101 also includes an exhaust gas treatment system 103 having a catalytic converter 104 for implementing the SCR decontamination method. The vehicle 101 includes a tank 105 for liquid additives. Tank 105 is connected via conduit 107 to injector 108 for injecting liquid additive into gas treatment system 103 . The injector is supplied with pressurized liquid additive by eg a pump integrated in the liquid additive metering module 106 located at the tank.
[0054] When the engine 102 is running, it produces exhaust gases, and these gases are directed toward the exhaust gas treatment system 103 . The exhaust gas treatment system 103 is supplied with liquid additive by means of a hydraulic circuit formed by a pump integrated in the module 106 , a pipe 1...
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The invention relates to a process for dynamic monitoring of the flow rate of liquid additive consumed by a liquid additive injector of a motor vehicle exhaust gas treatment system. The measurement (302) of the pressure of the liquid, firstly, makes it possible to deduce the flow rate circulating through the orifice and, secondly, by knowing the operating characteristic of the pump, to determine (303) the flow rate of liquid additive actually delivered to the system for treating the polluting gases. The process further proposes a characterization phase of the pump comprising the command (401)for the closure of the injector, the measurement (402) of at least two pressure values for two different operating speeds of the pump, and the updating, on the basis of the pressure values measured, of the pump operating characteristic table.
Description
technical field [0001] The present invention relates generally to exhaust gas treatment systems for motor vehicles. [0002] More specifically, the present invention relates to the dynamic monitoring of the flow of liquid additives injected into an exhaust gas treatment system of a motor vehicle, such as a selective catalytic reduction treatment system. Background technique [0003] The invention finds application in particular in vehicles equipped with diesel engines, such as light vehicles, utility vehicles or trucks (or heavy vehicles) with such an engine. [0004] Exhaust gases produced by vehicles with compression ignition engines (called diesel engines) or vehicles with controlled ignition engines (called gasoline engines) are especially composed of, for example, carbon oxides (COx, for CO and CO 2 ) and nitrogen oxides (NOx, for NO and NO 2 ) of gaseous air pollutants. Diesel engines in particular are subject to regulations aimed at reducing the amount of polluting...
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IPC IPC(8): F01N3/20F01N9/00F01N11/00
CPCF01N3/2066F01N3/208F01N9/00F01N11/00F01N2550/05F01N2560/08F01N2610/02F01N2610/1433F01N2610/144F01N2610/1453F01N2610/146F01N2900/0416F01N2900/1806F01N2900/1808F01N2900/1812F01N2900/1821F01N2900/1822Y02A50/20Y02T10/12B60Q9/00F01N2610/1406F01N2610/1426F01N2610/148
Inventor G·马甘
Owner 艾可蓝欧洲有限公司