Exhaust gas recirculation control systems and methods
First Claim
1. A fuel control system of a vehicle, comprising:
- an injection control module that determines a first target amount of fuel for a combustion event of an engine; and
a command module that selectively command the injection control module to provide two fuel injections when a torque request decreases and that determines whether to command the injection control module to provide the two fuel injections based on a difference between an estimated mass fraction of recirculated exhaust gas in a gas charge of the combustion event and a target mass fraction of recirculated exhaust gas for the combustion event,wherein, in response to the command, the injection control module;
determines second and third target amounts of fuel based on the first target amount;
provides a first one of the two fuel injections during the combustion event based on the second target amount; and
provides a second one of the two fuel injections during a compression stroke of the combustion event based on the third target amount.
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Accused Products
Abstract
A fuel control system of a vehicle includes an injection control module and a command module. The injection control module determines a first target amount of fuel for a combustion event of an engine. A command module selectively command the injection control module to provide two fuel injections when a torque request decreases. In response to the command, the injection control module: determines second and third target amounts of fuel based on the first target amount; provides a first fuel injection during the combustion event based on the second target amount; and provides a second fuel injection during a compression stroke of the combustion event based on the third target amount.
133 Citations
18 Claims
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1. A fuel control system of a vehicle, comprising:
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an injection control module that determines a first target amount of fuel for a combustion event of an engine; and a command module that selectively command the injection control module to provide two fuel injections when a torque request decreases and that determines whether to command the injection control module to provide the two fuel injections based on a difference between an estimated mass fraction of recirculated exhaust gas in a gas charge of the combustion event and a target mass fraction of recirculated exhaust gas for the combustion event, wherein, in response to the command, the injection control module; determines second and third target amounts of fuel based on the first target amount; provides a first one of the two fuel injections during the combustion event based on the second target amount; and provides a second one of the two fuel injections during a compression stroke of the combustion event based on the third target amount. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A fuel control method for a vehicle, comprising:
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determining a first target amount of fuel for a combustion event of an engine; determining whether to command provision of two fuel injections based on a difference between an estimated mass fraction of recirculated exhaust gas in a gas charge of the combustion event and a target mass fraction of recirculated exhaust gas for the combustion event; selectively commanding provision of the two fuel injections when a torque request decreases; and in response to the command; determining second and third target amounts of fuel based on the first target amount; providing a first one of the two fuel injections during the combustion event based on the second target amount; and providing a second one of the two fuel injections during a compression stroke of the combustion event based on the third target amount. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification