Method and system for exhaust cleaning
First Claim
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1. A method for estimation of a soot load in a particle filter in an exhaust cleaning system, comprising:
- measuring a pressure drop across said particle filter to determine said soot load in said filter, wherein said estimation is based on said measuring of said pressure drop at a specific time when an exhaust volume flow of said exhaust cleaning system exceeds a flow threshold value;
determining whether said particle filter has for a sufficient period of time maintained a temperature above a second temperature threshold value which is high enough and for a sufficient period of time to remove water from said particle filter, so that said filter is substantially free from water; and
determining whether a temperature of said particle filter exceeds a first threshold value which is higher than a temperature at which water in exhaust gases in said exhaust cleaning system can condense.
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Abstract
A method and a system for estimation of a soot load in a particle filter in an exhaust cleaning system, which estimation involves using a pressure drop across said particle filter in order to determine the soot load. Measurement of the pressure drop across the particle filter and therefore the estimation have to take place at a time when an exhaust mass flow of the exhaust cleaning system exceeds a flow threshold value, the particle filter is substantially free from water and a temperature of the particle filter exceeds a first threshold value. The result is a robust estimate of the soot load in the particle filter.
6 Citations
22 Claims
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1. A method for estimation of a soot load in a particle filter in an exhaust cleaning system, comprising:
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measuring a pressure drop across said particle filter to determine said soot load in said filter, wherein said estimation is based on said measuring of said pressure drop at a specific time when an exhaust volume flow of said exhaust cleaning system exceeds a flow threshold value; determining whether said particle filter has for a sufficient period of time maintained a temperature above a second temperature threshold value which is high enough and for a sufficient period of time to remove water from said particle filter, so that said filter is substantially free from water; and determining whether a temperature of said particle filter exceeds a first threshold value which is higher than a temperature at which water in exhaust gases in said exhaust cleaning system can condense. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 20, 21, 22)
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18. A system configured for estimating a soot load in a particle filter in an exhaust cleaning system, wherein the estimation uses a pressure drop across said particle filter to determine said soot load, said system comprising:
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a flow determining device configured to determine whether an exhaust volume flow of said exhaust cleaning system exceeds a flow threshold value; a water presence determining device configured to determine if said particle filter is substantially free from water if said particle filter has for a sufficient period of time maintained a temperature above a second threshold value which is high enough to remove water from said particle filter; a temperature estimating device configured to estimate a temperature of said particle filter; and an estimator device configured for effecting said soot load estimation on the basis of a measurement of said pressure drop made at a specific time when said exhaust mass volume flow exceeds a flow threshold value, said particle filter is substantially free from water and said temperature of said particle filter exceeds a first threshold value which is higher than a temperature at which water in exhaust gases in said exhaust cleaning system can condense. - View Dependent Claims (19)
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Specification