System and method for estimating the richness of the gaseous mixture in the combustion chamber of an internal combustion engine of a motor vehicle power plant

摘要

A system for estimating richness of a gaseous mixture in a combustion chamber of an internal combustion engine of a motor vehicle power plant, including a mechanism injecting an additional combustible gas into a fresh air intake circuit of the engine, a mechanism measuring concentrations of the additional gas in the fresh air intake circuit and in an engine exhaust gas circuit respectively, a mechanism determining a ratio between the measured concentration of the additional gas in the intake circuit and the measured concentration of the additional gas in the exhaust circuit, and a mechanism estimating the richness of the gaseous mixture in the combustion chamber of the engine from the determined ratio.

主权项

1. A system for estimating richness of a gas mixture in a combustion chamber of an internal combustion engine of a motor vehicle power plant, the gas mixture serving as primary fuel for the engine, the system comprising:
means for injecting an additional combustible gas into a fresh-air intake circuit of the engine, means for measuring a concentration of the additional combustible gas in the fresh-air intake circuit and a concentration of the additional combustible gas in a gas-exhaust circuit of the engine, means for determining a ratio between a measurement of the concentration of the additional combustible gas in the intake circuit and a measurement of the concentration of the additional combustible gas in the gas-exhaust circuit, and means for estimating the richness of the gas mixture in the combustion chamber of the engine from the determined ratio.