Closed loop A/F ratio control for diesel engines using an oxygen sensor
First Claim
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1. A fuel control system for a diesel engine, comprising:
- a first module that selectively regulates operation of said diesel engine in one of a closed-loop air to fuel ratio (A/F) control mode and an open-loop A/F control mode;
a second module that calculates a block learn multiplier (BLM) based on a feedback signal when said first module operates said diesel engine in said closed-loop A/F control mode; and
a third module that adjusts a base fueling rate of said diesel engine based on said BLM when said first module operates said diesel engine in said open-loop A/F control mode.
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Abstract
A fuel control system for a diesel engine includes a first module that calculates a block learn multiplier (BLM) based on a feedback signal during a closed-loop fuel control period. A second module adjusts a base fueling rate of the diesel engine based on the BLM during an open-loop fuel control period.
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Citations
18 Claims
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1. A fuel control system for a diesel engine, comprising:
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a first module that selectively regulates operation of said diesel engine in one of a closed-loop air to fuel ratio (A/F) control mode and an open-loop A/F control mode; a second module that calculates a block learn multiplier (BLM) based on a feedback signal when said first module operates said diesel engine in said closed-loop A/F control mode; and a third module that adjusts a base fueling rate of said diesel engine based on said BLM when said first module operates said diesel engine in said open-loop A/F control mode. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of regulating fueling of a diesel engine, comprising:
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selectively regulating operation of said diesel engine in one of a closed-loop air to fuel ratio (A/F) control mode and an open-loop A/F control mode; calculating a block learn multiplier (BLM) based on a feedback signal during said closed-loop A/F control mode; and adjusting a base fueling rate of said diesel engine based on said BLM during said open-loop A/F control mode. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method of regulating fueling of a diesel engine during an open-loop air to fuel ratio (A/F) control mode, comprising:
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initiating a closed-loop A/F control mode; generating a feedback signal; calculating a block learn multiplier (BLM) based on said feedback signal during said closed-loop A/F control mode; initiating said open-loop A/F control mode; and adjusting a base fueling rate of said diesel engine based on said BLM during said open-loop A/F control mode. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification