FUEL CONTROL STRATEGY FOR HEATING A CATALYST
First Claim
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1. A control system for an engine having N cylinders in first and second banks, wherein N is an integer greater than two, comprising:
- a catalyst heat module that selectively operates the engine in a catalyst heat mode to heat a catalyst; and
a fuel control module that, throughout a fuel injection sequence for each of the N cylinders, adjusts a first air/fuel (A/F) ratio for the first bank to a rich value and adjusts a second A/F ratio for the second bank to a lean value.
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Abstract
A control system for an engine having N cylinders in first and second banks includes a catalyst heat module and a fuel control module. N is an integer greater than two. The catalyst heat module selectively operates the engine in a catalyst heat mode to heat a catalyst. The fuel control module, throughout a fuel injection sequence for each of the N cylinders, adjusts a first air/fuel (A/F) ratio for the first bank to a rich value and adjusts a second A/F ratio for the second bank to a lean value.
19 Citations
20 Claims
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1. A control system for an engine having N cylinders in first and second banks, wherein N is an integer greater than two, comprising:
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a catalyst heat module that selectively operates the engine in a catalyst heat mode to heat a catalyst; and a fuel control module that, throughout a fuel injection sequence for each of the N cylinders, adjusts a first air/fuel (A/F) ratio for the first bank to a rich value and adjusts a second A/F ratio for the second bank to a lean value. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10)
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7. The control system of 5, wherein the catalyst heat module terminates the catalyst heat mode when a catalyst temperature is greater than or equal to a light-off temperature.
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11. A method for an engine having N cylinders in first and second banks, wherein N is an integer greater than two, comprising:
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selectively operating the engine in a catalyst heat mode to heat a catalyst; and throughout a fuel injection sequence for each of the N cylinders, adjusting a first air/fuel (A/F) ratio for the first bank to a rich value and adjusting a second A/F ratio for the second bank to a lean value. - View Dependent Claims (12, 13, 14, 15, 16, 18, 19, 20)
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17. The method of 15, further comprising terminating the catalyst heat mode when a catalyst temperature is greater than or equal to a light-off temperature.
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