Estimation of the temperature of a catalytic converter and corresponding applications
AssigneeGM Global Technology Operations LLC
InventorsHelmut Oswald, Frank Schwerin
Life of this patent
Estimating the term…
Abstract
The aim of the invention is to estimate a temperature jump (ΔT) of a catalytic converter of an internal combustion engine in the event of a change in the composition of the exhaust gas. To this end, a quantity of a reactand (SI) stored in the catalytic converter is monitored (2-7), and the heating (ΔT) of the catalytic converter resulting from the reaction heat released during the reaction of the stored reactand is assumed (13, 14, 16, 17) as the temperature jump (ΔT).
Claims13
A method for estimating the temperature (Tcat) of an exhaust gas catalytic converter for an internal combustion engine, comprising the steps of:
- calculating a temperature ({tilde over (T)}cat) of the exhaust gas catalytic converter by using at least the exhaust gas throughput (M) of the catalytic converter and a parameter (λ) characterizing the composition of the exhaust gas;
- tracking a quantity (SI) of a reactand stored in the exhaust gas catalytic converter;
- calculating the temperature (Tcat) of the exhaust gas catalytic converter by taking into account the reaction heat being released during the conversion of the stored reactand in the event of a change in composition of the exhaust gas allowing a conversion of the stored reactand;
- predetermining a limit temperature (Tc);
- regulating a mixture supplied to the internal combustion engine such that the temperature (Tcat) remains below the predetermined limit temperature;
- and
- calculating a future catalytic converter temperature under an assumption that the mixture is regulated according to a present wish of a driver, and the mixture is regulated deviating from the driver's wish if the future catalytic converter temperature is greater than the limit temperature (Tc).
A method for estimating the temperature (Tcat) of an exhaust gas catalytic converter for an internal combustion engine, comprising the steps of:
- calculating a temperature ({tilde over (T)}cat) of the catalytic converter by using at least the exhaust gas throughput (M) of the catalytic converter and a parameter (λ) characterizing the composition of the exhaust gas;
- tracking a quantity (SI) of a reactand stored in the exhaust gas catalytic converter;
- calculating the temperature (Tcat) of the exhaust gas catalytic converter by taking into account the reaction heat being released during the conversion of the stored reactand in the event of a change in composition of the exhaust gas allowing a conversion of the stored reactand;
- predetermining a limit temperature (Tc);
- regulating a mixture supplied to the internal combustion engine such that the temperature (Tcat) remains below the predetermined limit temperature;
- and
- calculating a hypothetical catalytic converter temperature (T'cat, n), which would be produced if the reactand stored in the catalytic converter were completely converted, and in that a mixture change is blocked, when it is ascertained, that the hypothetical temperature is above the limit temperature (Tc).
Dependencies are inferred from the claim text.