Computer instructions for control of multi-path exhaust system in an engine
First Claim
1. A computer readable storage medium having stored data representing instructions executable by a computer to control an internal combustion engine of a vehicle, said engine having at least a first and second group of cylinders, with a first emission control device coupled exclusively to said first group of cylinders and a second emission control device coupled to said second group of cylinders, said storage medium comprising:
- instructions for determining a requested engine output;
instructions for operating both the first and second group of cylinders near stoichiometry in first region and adjusting at least airflow to provide said requested engine output; and
instructions for operating said first group near stoichiometry and second group without injected fuel in second region where said engine output request is lower than in said first region, adjusting at least airflow to said first group to provide said requested engine output.
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Accused Products
Abstract
A computer controller is described for disabling fuel injection into cylinder groups of an engine. The system controls engine output a reduced engine torques without reducing engine air amounts below an engine misfire amount by reducing the number of cylinders carrying out combustion. Engine airflow is controlled to maintain accurate torque at requested levels throughout engine operating ranges.
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Citations
20 Claims
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1. A computer readable storage medium having stored data representing instructions executable by a computer to control an internal combustion engine of a vehicle, said engine having at least a first and second group of cylinders, with a first emission control device coupled exclusively to said first group of cylinders and a second emission control device coupled to said second group of cylinders, said storage medium comprising:
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instructions for determining a requested engine output;
instructions for operating both the first and second group of cylinders near stoichiometry in first region and adjusting at least airflow to provide said requested engine output; and
instructions for operating said first group near stoichiometry and second group without injected fuel in second region where said engine output request is lower than in said first region, adjusting at least airflow to said first group to provide said requested engine output. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for an internal combustion engine of a vehicle, said engine having at least a first and second group of cylinders, said system comprising:
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a first emission control device coupled exclusively to said first group of cylinders;
a second emission control device coupled to said second group of cylinders;
a controller for operating in a first mode with both cylinder groups combusting air and injected fuel, with engine output of said first and second cylinder group controlled to a desired output by adjusting airflow to both said first and second cylinder groups; and
operating in a second mode with said first cylinder group combusting air and injected fuel and said second cylinder group pumping air without injected fuel, with engine output of said first cylinder group controlled to said desired output by adjusting airflow to said first cylinder group, where said second mode includes operation in a region where an air amount that would be required if both cylinder groups were combusting would be less than an engine misfire air limit. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A system for an internal combustion engine of a vehicle, said engine having at least a first and second group of cylinders, said system comprising:
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a first emission control device coupled exclusively to said first group of cylinders;
a second emission control device coupled exclusively to said second group of cylinders;
a third emission control device coupled downstream of said first emission control device;
a fourth emission control device coupled downstream of said second emission control device;
an electronically controlled throttle coupled to said first and second cylinder groups; and
a controller for operating in a first mode with both cylinder groups combusting air and injected fuel, with engine output of said first and second cylinder group controlled to a desired output by adjusting airflow to both said first and second cylinder groups;
operating in a second mode with said first cylinder group combusting air and injected fuel and said second cylinder group pumping air without injected fuel, with engine output of said first cylinder group controlled to said desired output by adjusting airflow to said first cylinder group, where said second mode includes operation in a region where an air amount that would be required if both cylinder groups were combusting would be less than an engine misfire air limit; and
controlling position of said electronically controlled throttle plate to control engine airflow. - View Dependent Claims (18, 19, 20)
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Specification