METHOD AND SYSTEM FOR DIAGNOSING THE COMPOSITION OF A TANK FOR CONTROLLING AN INJECTION ON A NITROGEN-OXIDE REDUCTION CATALYST

摘要

According to the invention, the composition of a reducing-agent solution (10) is monitored using a means (40) transmitting to a calculator (3) data relative to a centrifugal pump (4) for feeding the solution to an injector (45) mounted in the exhaust line of an automobile. It is thus possible to check indirectly the volumetric mass of the reducer solution by estimating the power consumption deviations of the centrifugal pump (4) pumping the reducing agent (10) from the tank (1). The system of the invention can be used for efficiently indicating that the liquid solution used is not the optimal solution to be injected into the exhaust line for a pollution control at a SCR (nitrogen oxide reduction) catalyst. The system does not require any high-precision sensor in the tank (1).