Patent ID: 6909961
Filing Date: 2005-06-21
Classification: F02D,F02M,G01K,Y02T

Abstract:
1. An arrangement for determining a temperature quantity in a mass flow line, the arrangement comprising: a first mass flow line for conducting a first gas mass flow and said first mass flow line including a throttle position disposed therein; a second mass flow line opening into said first mass flow line downstream of said throttle position for introducing a second gas flow into said first mass flow line to form a total gas mass flow; and, a control unit including means for determining a first quantity for the portion of said second gas mass flow of said total flow or for determining a second quantity for the portion of said first gas mass flow in said first mass flow line of said total flow; said control unit further including means for determining a third quantity from at least two of the following temperatures: the temperature of the second gas flow; the temperature upstream of said throttle position; and, the temperature after introducing said second gas flow; said control unit including a model for computing a third one of said temperatures on the basis of the portion quantity and at least a first one and a second one of said temperatures; a filter of variable time constant which smooths said third one of said temperatures; and, said time constant being adapted in dependence upon the portion of said second gas flow of said total flow with said time constant being greater the greater said portion of said second gas flow is.