METHOD FOR DETERMINING A RESULTING TOTAL MASS FLOW TO AN EXHAUST GAS MASS FLOW SENSOR
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United States of America Patent
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Issued Date -
May 23, 2013
app pub date -
Jul 5, 2011
filing date -
Aug 3, 2010
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Abandoned
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Abstract
A method for determining a resulting total mass flow to an exhaust gas mass flow sensor involves providing an exhaust gas mass flow sensor comprising a first sensor element and a second sensor element. The second sensor element comprises a first temperature sensor and a second temperature sensor arranged in a row in an exhaust flow direction. A specific heat output is determined at the exhaust gas mass flow sensor with the first sensor element and the second sensor element. A value of a summed mass flow is determined from a stored first characteristic map, a specific heat output being a function of the value. A normalized temperature gradient is determined. A back flow portion is determined from a stored second characteristic map, the back flow portion being a function of the specific heat output in dependence on the normalized temperature gradient. The resulting total mass flow is determined.
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