Pressure measurement for post-treatment system of diesel type heat engine, involves calculating difference between signals, delivered by upstream and downstream probes of particle filter after retiming, to provide pressure difference

摘要

#CMT# #/CMT# The process involves calculating a pressure (Pav) downstream of a particle filter (3) from an atmospheric pressure value and the loss of charge modeled between the filter and an exhaust line end. A pressure (Pam) upstream the filter is estimated by modeling the loss from the pressure (Pav). Signals (sam, sav) delivered by upstream and downstream probes (Sam, Sav) of the filter after retiming are corrected based on estimated and calculated pressures, where oxygen concentrations detected by the probes are identical. The difference between the signals is calculated to provide a pressure difference. #CMT#USE : #/CMT# Used for measuring the pressure in a post-treatment system of a diesel type heat engine in a motor vehicle (claimed). #CMT#ADVANTAGE : #/CMT# The difference between the signals delivered by upstream and downstream probes is calculated to provide the pressure difference, effectively measuring the pressure difference at the terminals of the post-treatment system of the exhaust gas without utilizing the additional sensor required for controlling the system. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a flowchart of different steps of a pressure measuring method in a nominal mode. `(Drawing contains non-English language text)`.