Method and system at supply of additive to an exhaust gas stream

A vehicle comprising a system for use in connection with the supplying of a first additive for treating an exhaust gas stream resulting from combustion in a combustion engine, wherein said first additive is supplied to said exhaust gas stream, and wherein said first additive is used to reduce at least a first substance present in said exhaust gas stream, wherein the system comprises elements configured to:

• estimate a reduction of said first substance based on a first measurement of a presence of said first substance in said exhaust gas stream downstream of said supply of said first additive, and a second measurement of a presence of said first substance in said exhaust gas stream upstream of said supply of additive;
• compare said estimated reduction to a first reduction;
• and
• correct said second measurement of said first substance based on said comparison.

A computer program for use in connection with the supplying of a first additive for treating an exhaust gas stream resulting from combustion in a combustion engine, wherein said first additive is supplied to said exhaust gas stream, and wherein said first additive is used to reduce at least a first substance present in said exhaust gas stream, wherein the computer program product is stored in a non-transitory computer-readable medium and comprises computer-readable program code portions embodied therein, the computer-readable program code portions configured to cause an electronic processor to:

• supply a first additive to the exhaust gas stream;
• estimate a reduction of said first substance based on a first measurement of a presence of said first substance in said exhaust gas stream downstream of said supply of said first additive, and a second measurement of a presence of said first substance in said exhaust gas stream upstream of said supply of additive;
• compare said estimated reduction to a first reduction;
• and
• correct said second measurement of said first substance based on said comparison.

A system for use in connection with the supplying of a first additive for treating an exhaust gas stream resulting from combustion in a combustion engine, wherein said first additive is supplied to said exhaust gas stream, and wherein said first additive is used to reduce at least a first substance present in said exhaust gas stream, wherein the system comprises elements configured to:

• estimate a reduction of said first substance based on a first measurement of a presence of said first substance in said exhaust gas stream downstream of said supply of said first additive, and a second measurement of a presence of said first substance in said exhaust gas stream upstream of said supply of additive;
• compare said estimated reduction to a first reduction;
• and
• correct said second measurement of said first substance based on said comparison.