Method for adjusting a detector's abundance setpoint while purging

Abstract

The invention relates to a method for adjusting the abundance set point (Consrich sond) of a so-called upstream probe, which is arranged in the exhaust line at the outlet of a heat engine and where the scavenging is carried out, during scavenging Implemented with fresh air in the engine and bringing unburned air into the line, the abundance regulation of the air / fuel mixture is carried out in the engine according to the estimated abundance set point (Consrich sond) at the upstream probe, which The abundance setpoint at the engine is based on a predetermined abundance setpoint at the engine and an abundance measured by an upstream probe. The estimated abundance setpoint (Consrich sond) at the upstream probe at a given moment is adjusted by a correction term (Term) that varies with the current engine speed (RM) and scavenging rate (Tb) at that given moment Modified to give a modified abundance setpoint at the upstream detector (Consrich réac).

Description

technical field [0001] The present invention relates to a method for adjusting the detector abundance setting value during scavenging by taking into account the effect of scavenging on the detector abundance setting value. Advantageously, for a turbocharged engine, the detector is located at A detector at the outlet of the engine or turbine, eg upstream of a catalytic converter present in the exhaust line, selected according to the flow direction of the exhaust gas in the line. [0002] Preferably, the present invention is applicable to engines with controlled ignition and boosting of gasoline fuel. Gasoline names include gasoline, ethanol, or LPG-based blends. This is not limiting, and the present invention is applicable to any motorized device. Background technique [0003] refer to figure 1 , showing a turbocharged heat engine 1 and a turbine 2 at the engine outlet. On the exhaust line from which the gas from the engine 1 is discharged, there is a catalytic converter ...

AI Technical Summary

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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