Catalyst temperature model
AssigneeDaimlerChrysler AG
InventorsMark J Poublon, Steven R Mazure, James J Snyder, Danny K Schuelke, Jayanthi Iyengar, Gary R Oshnock, Christopher P Thomas, James G Mazak, Andrew C Bartlett
Life of this patent
Estimating the term…
Abstract
A method for calculating the temperature of a catalyst in a catalytic converter. The method includes the steps of determining a first catalyst temperature; determining a stabilized catalyst temperature; and using the first catalyst temperature, the stabilized catalyst temperature and an update fraction to calculate an updated catalyst temperature.
Claims22
A method for monitoring the temperature of a catalyst in a catalytic converter in an exhaust system, the method comprising the steps of:
- determining a first catalyst temperature;
- determining a stabilized catalyst temperature which includes the steps of determining a quantity of unfueled engine cylinders, and calculating a term to account for a quantity of air pumped through an engine without a corresponding release of combustion energy based on the quantity of unfueled engine cylinders;
- and
- determining an updated catalyst temperature based on the first catalyst temperature, the stabilized catalyst temperature and an update fraction.
A method for monitoring the temperature of a catalyst in a catalytic converter of an exhaust system, the method comprising the steps of:
- determining a first catalyst temperature;
- determining a first portion of a stabilized catalyst temperature based on a quantity of fueled engine cylinders and a steady state base temperature of the catalyst, the steady state base temperature based on a manifold absolute pressure and an engine rotational speed;
- determining a second portion of the stabilized catalyst temperature based on a quantity of unfueled engine cylinders;
- and
- calculating an updated catalyst temperature based on the first catalyst temperature, the first and second portions of the stabilized catalyst temperature and an update fraction.
Dependencies are inferred from the claim text.