Loading patent…
AssigneeFord Motor Company
InventorsGuido Dickers, Klemens Grieser
Estimating the term…
A method for controlling the temperature of an exhaust gas treatment system in the exhaust system of an internal combustion engine in the region of a predetermined intended temperature, comprising a two-position device for varying the temperature of the exhaust gases, a device for measuring the actual temperature and a device for determining a quantity which approximately represents a value for the input of energy into the exhaust gas treatment system is described, as is an apparatus for putting the method into practice. The actual temperature is compared with the intended temperature in a two-step control element and an output signal is produced. From this output signal a modified output signal is produced and supplied to the varying device, such that in case of an output signal which indicates heating of the exhaust gas, if the energy input value is increasing this signal is modified in a direction effecting cooling of the exhaust gas, and/or that in the case of an output signal which indicates cooling of the exhaust gas, if the energy input value is decreasing this signal is modified in a direction effecting heating of the exhaust gas. Further, the two-step control can be formed so as to have accelerated response. By these measures a stable temperature control is obtained despite large time lags.
A method for controlling the temperature of an exhaust gas treatment system in the exhaust system of an internal combustion engine in the region of a predetermined intended temperature, comprising a device for varying the temperature of the exhaust gases flowing through the exhaust gas treatment system, by means of which the exhaust gas treatment system is supplied with colder or hotter exhaust gases in dependence on a control signal of an engine control unit, and also comprising a device for determining the actual temperature of the exhaust gas treatment system and a device for determination of a quantity which approximately represents a value for the input of energy into the exhaust gas treatment system, characterized in that the actual temperature is compared with the intended temperature in a two-step control element (30) which produces an output signal indicating cooling or heating of the exhaust gas, and that from this output signal a modified output signal is produced and supplied to the varying device, such that in case of an output signal which indicates heating of the exhaust gas, if the energy input value is increasing the signal is modified in a direction effecting cooling of the exhaust gas and/or that in the case of an output signal which indicates cooling of the exhaust gas, if the energy input value is decreasing this signal is modified in a direction effecting heating of the exhaust gas.
A system for controlling a temperature of an exhaust gas treatment system of an internal combustion engine, the system comprising:
A method for controlling an exhaust gas temperature of an internal combustion engine having an exhaust gas treatment system, the system coupled to a temperature sensor, the method comprising:
Dependencies are inferred from the claim text.