System for managing a reagent dispensing device in an exhaust line

Abstract

The invention relates to a system for managing a reagent dispensing device in the exhaust line of an engine, said circuit including a tank (1), an injection means (3), a means for conditioning the reagent, sensors capable of determining the representative parameters of the condition of the dispensing circuit and of the reagent, and actuators for controlling the conditioning and injection means driven by a calculation unit based on the condition of the dispensing circuit and of the reagent and on the engine parameters determined by an engine control unit (5) characterised in that the calculation unit is integrated in the engine control unit (5) and in that the system includes an analog / digital interface (4) for processing the analog signals from the sensors (2) and the actuators (3, 7, 8, 9), provided in the vicinity of the tank (1) and connected to the engine control unit by a multiplexed digital link.

Description

technical field [0001] This application claims priority from French patent application 0756936 filed on August 3, 2007, the content of which (description, claims and drawings) is incorporated herein by reference. [0002] The invention relates to the control of reactant distribution circuits in exhaust lines. Background technique [0003] The pollutants produced by the combustion of automobile engines, diesel engines or gasoline engines are mostly unburned hydrocarbons HC, nitrogen oxides (one nitrogen oxide NO and two nitrogen oxides NO 2 , generally collectively referred to as NOx), carbon oxides (monocarbon oxide CO) and solid particles of carbon in the case of lean-burn diesel engines and direct-injection gasoline engines. [0004] Direct injection of hydrocarbon fuels and systems that partially reintroduce exhaust gases into the engine can reduce the formation of certain pollutants in the same combustion chamber, but in order to meet increasingly stringent environmenta...

AI Technical Summary

Problems solved by technology

Thus, the concept implies the development of a specific control unit for controlling the injection of reactants, which in addition to the specific control unit development costs also entails assembly costs and wiring costs for easy access to this specific control unit, in some cases at least with The cost of changing the body, compartment or other parts of the car, its positioning, etc.

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