Method and apparatus for determining a temperature of an emission catalyst
First Claim
1. An article of manufacture for determining a catalyst temperature of an engine, the article of manufacture comprising:
- a computer storage medium having a computer program encoded therein for determining a first exhaust flow rate and a second exhaust flow rate based on a total flow of said exhaust gases, determining a first temperature of exhaust gases associated with said first exhaust flow rate based on a steady state temperature and an amount of heat transferred from said exhaust gases associated with said first exhaust flow rate to an exhaust system;
determining a second temperature of exhaust gases associated with said second exhaust flow rate based on said steady state temperature, and determining said catalyst temperature based on said first temperature and said second temperature.
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Accused Products
Abstract
A control system and method for controlling an engine (10) of an automotive vehicle having a catalyst (34) and controller (40) is set forth herein. The controller (40) is configured to determine a first exhaust flow rate and a second exhaust flow rate based on a flow rate of the exhaust gases. The controller is further configured to determine a first temperature (T1) of exhaust gases associated with the first exhaust flow rate based on a steady state temperature and an amount of heat transferred from the exhaust gases associated with the first exhaust flow rate to an exhaust system. The controller is further configured to determine a second temperature of exhaust gases associated with the second exhaust flow rate based on the steady state temperature. The controller is further configured to determine the catalytic converter temperature based on the first temperature and the second temperature.
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Citations
25 Claims
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1. An article of manufacture for determining a catalyst temperature of an engine, the article of manufacture comprising:
a computer storage medium having a computer program encoded therein for determining a first exhaust flow rate and a second exhaust flow rate based on a total flow of said exhaust gases, determining a first temperature of exhaust gases associated with said first exhaust flow rate based on a steady state temperature and an amount of heat transferred from said exhaust gases associated with said first exhaust flow rate to an exhaust system;
determining a second temperature of exhaust gases associated with said second exhaust flow rate based on said steady state temperature, and determining said catalyst temperature based on said first temperature and said second temperature.
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2. A system for determining a temperature of an emission catalyst communicating with exhaust gases from an engine, said system comprising:
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a first sensor generating a signal indicative of a flow rate of said exhaust gases; and
,a controller operably connected to said first sensor, said controller being configured to determine a first exhaust flow rate and a second exhaust flow rate based on a the flow rate of said exhaust gases, said controller further configured to determine a first temperature of exhaust gases associated with said first exhaust flow rate based on a steady state temperature and an amount of heat transferred from said exhaust gases associated with said first exhaust flow rate to an exhaust system, said controller further configured to determine a second temperature of exhaust gases associated with said second exhaust flow rate based on said steady state temperature, and said controller further configured to determine said catalytic converter temperature based on said first temperature and said second temperature. - View Dependent Claims (3)
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4. A method for determining a temperature of an emission catalyst communicating with exhaust gases from an engine, said method comprising:
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determining a first exhaust flow rate and a second exhaust flow rate based on a total flow rate of said exhaust gases;
determining a first temperature of exhaust gases associated with said first exhaust flow rate based on a steady state temperature and an amount of heat transferred from said exhaust gases associated with said first exhaust flow rate to an exhaust system;
determining a second temperature of exhaust gases associated with said second exhaust flow rate based on said steady state temperature; and
determining said catalyst temperature based on said first temperature and said second temperature. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for determining a temperature of an exhaust flow comprising:
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measuring engine operating conditions including air mass;
determining a steady state temperature as a function of the engine operating conditions;
determining a first temperature of a first flow rate of an exhaust flow from an amount of heat transferred from said exhaust gases associated with said first exhaust flow rate to an exhaust system in response to air mass;
determining a second temperature of a second flow rate of the exhaust flow bypassing a heat transfer model in response to the steady state temperature; and
determining a first exhaust temperature from the first temperature and the second temperature as a function of air mass. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
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Specification