METHOD FOR CONTROLLING EXHAUST GAS RE-CIRCULATION SYSTEM IN AN INTERNAL COMBUSTION ENGINE
First Claim
1. A method for controlling re-circulation of exhaust gas in an internal combustion engine comprising:
- receiving a signal indicative of an engine operating temperature;
comparing the engine operating temperature to a first predetermined IEGR threshold;
when the engine operating temperature is less than the first predetermined IEGR threshold, activating a first IEGR mode; and
when the engine operating temperature is greater than the first predetermined IEGR threshold, deactivating the first IEGR mode and activating a second IEGR mode.
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Accused Products
Abstract
A method for controlling re-circulation of exhaust gas (EGR) in an internal combustion engine includes receiving a signal indicative of an engine operating temperature and comparing the engine operating temperature to a first predetermined IEGR threshold. When the engine operating temperature is less than the first predetermined internal EGR threshold, a first internal EGR mode is activated, whereby engine emissions may be reduced or combustion stability may be enhanced. When the engine operating temperature is greater than the first predetermined internal EGR threshold, the first internal EGR mode is deactivated, and a second internal EGR mode is activated, whereby emissions may be reduced as exhaust system heating is accelerated. When the operating temperature is greater than the second temperature threshold, the second internal EGR mode may be deactivated a third mode may be enabled with only external EGR.
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Citations
20 Claims
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1. A method for controlling re-circulation of exhaust gas in an internal combustion engine comprising:
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receiving a signal indicative of an engine operating temperature; comparing the engine operating temperature to a first predetermined IEGR threshold; when the engine operating temperature is less than the first predetermined IEGR threshold, activating a first IEGR mode; and when the engine operating temperature is greater than the first predetermined IEGR threshold, deactivating the first IEGR mode and activating a second IEGR mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for controlling re-circulation of exhaust gas in an internal combustion engine comprising:
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receiving a signal indicative of an engine operating temperature; comparing the engine operating temperature to a first predetermined IEGR threshold; when the engine operating temperature is less than the first predetermined IEGR threshold, activating a first IEGR mode; and after a predetermined first period of time, deactivating the first IEGR mode and activating a second IEGR mode. - View Dependent Claims (17, 18, 19, 20)
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Specification