Patent ID: 8099222

Claim:
A method for automatically controlling charge air temperature (TLL) of an internal combustion engine, comprising the steps of: distributing a coolant flow upstream of a recooler as a function of a position of a characteristic diagram-type thermostat valve between a recooler coolant flow and a bypass coolant flow; determining temperature of a charge air cooler coolant flow downstream of the recooler by reunited coolant flows; determining the charge air temperature (TLL) by the temperature of the charge air cooler coolant flow; computing a control deviation (dTLL) of a nominal charge air temperature ((TLL(SL)) from an actual charge air temperature (TLL(IST)), whereby the nominal charge air temperature ((TLL(SL)) is determined at least as a function of engine speed (nMOT); computing a nominal bypass coolant flow as a correcting variable (SG) from the control deviation (dTLL) by means of a charge air temperature controller; determining a control signal (PWM) for actuating the characteristic diagram-type thermostat valve from the nominal bypass coolant flow by a computing unit; and determining the position of the characteristic diagram-type thermostat valve by the control signal (PWM).