Method for adjusting the richness set value of a sensor during air scavenging
A detector and setting value technology, applied in electrical control, mechanical equipment, machine/engine, etc., can solve the problem of no longer ensuring the optimization of pollutant conversion, the degree of scavenging affects the abundance measurement value, and changes in the performance of catalytic converters, etc. problem, to achieve the effect of accelerating implementation, eliminating deviation, and changing efficiency
Active Publication Date: 2020-03-24
PEZHO SITROEN AUTOMOBILS SA
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Problems solved by technology
The first problem is that, during the phase of scavenging activation, the oxygen delivered to each exhaust valve of the cylinder can change the performance of the catalyst for the same abundance set point upstream of the catalyst
Optimum conversion of pollutants is no longer ensured if the catalyst window is moved
[0012] The second problem is that the degree of scavenging can also affect the abundance measurements from the detectors upstream of the catalyst
[0014] an adjustment module configured to determine an abundance correction to be applied in at least one cylinder according to a first calculation rule based on a value representing a difference between an abundance measured by the probe and an abundance setpoint at the probe, However, the document does not deal with scavenging in engines and does not give any guidance on the subject
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[0037] It should be understood that the drawings are given by way of example and not limitation of the invention. The drawings constitute schematic diagrams to facilitate the understanding of the present invention, and do not necessarily correspond to actual dimensions. Particularly, figure 1 Dimensions shown for various elements do not represent reality.
[0038] In the following, all drawings will be referred to in combination. When reference is made to one or more specific figures, those figures should be identified in conjunction with the other figures for the designated reference numerals.
[0039] Reference is made to all drawings and in particular to figure 1 and figure 2 , the present invention relates to a method of adjusting the abundance set point of a detector during a purge. This detector is called the upstream detector 4a, which is arranged in the exhaust pipe at the outlet of the heat engine 1, and the upstream detector 4a is the upstream first of the dete...
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The invention relates to a method for adjusting the richness set value (Consrich sond e) during air scavenging of a so-called upstream sensor disposed in an exhaust line of a heat engine, the air scavenging being performed on fresh air in the engine and allowing unburnt air to enter the line, an adjustment of the richness of the air / fuel mixture in the engine being carried out according to an estimated richness set value (Consrich sond) at the upstream sensor based on a pre-determined richness set value for the engine and a richness measured by the upstream sensor. The richness set value (Consrich sond) at the upstream sensor estimated at a given moment is updated by a corrective term (Term) at least a function of an engine speed (RM) and the scavenged air level (Tb) at said given moment in order to supply an updated richness set value (RConsrich reac) at the upstream sensor.
Description
technical field [0001] The present invention relates to a method for adjusting the detector abundance setpoint during scavenging by taking into account the effect of scavenging on the detector abundance setpoint, advantageously, for turbocharged engines, the detector is located at Detector at the outlet of the engine or turbine, for example upstream of a catalytic converter present in the exhaust line, which is chosen according to the flow direction of the exhaust gas in the line. [0002] Preferably, the invention is applicable to engines having gasoline fuel controlled ignition and supercharging. Gasoline designations include blends based on gasoline, ethanol, or liquefied petroleum gas. This is not limiting, and the invention is applicable to any motorized device. Background technique [0003] refer to figure 1 , shows a turbocharged heat engine 1 and a turbine 2 at the engine outlet. On the exhaust line of the exhaust gas from the engine 1 there is a catalytic conver...
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IPC IPC(8): F02D41/14F02D41/24
CPCF02D41/1401F02D41/1441F02D41/1454F02D41/1456F02D41/1486F02D2041/1418F02D2041/1431F02D2041/1432F02D2041/1433F02D2200/101
Inventor 西里尔·塔维罗德弗雷德里克·丹布里卡特格雷戈勒·加尼叶
Owner PEZHO SITROEN AUTOMOBILS SA