CONTROL OF ENGINE EXHAUST BACKPRESSURE FOLLOWING ENGINE COLD-START
First Claim
1. A method of controlling a rate of warm-up of an internal combustion engine fluidly connected to an exhaust system, the method comprising:
- identifying, via a controller, a cold-start of the engine; and
regulating, via the controller, in response to the identified cold-start of the engine, an exhaust pressure modulation (EPM) valve arranged in a main exhaust passage of the exhaust system, wherein the main exhaust passage channels engine exhaust gas to the ambient, to restrict a flow of the engine exhaust gas to the ambient and increase exhaust gas backpressure in the main exhaust passage up to a predetermined pressure value to thereby increase a load on and the rate of warm-up of the engine.
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Abstract
A method of controlling a rate of warm-up of an internal combustion engine fluidly connected to an exhaust system is disclosed. The method includes identifying a cold-start of the engine. The method also includes regulating, in response to the identified cold-start of the engine, an exhaust pressure modulation (EPM) valve arranged in a main exhaust passage of the exhaust system. The main exhaust passage channels engine exhaust gas to the ambient. Such regulation of the EPM valve will restrict a flow of the engine exhaust gas to the ambient and increase exhaust gas backpressure in the exhaust system up to a predetermined pressure value. Furthermore, the subject regulation of the EPM valve will increase a load on and the rate of warm-up of the engine. A vehicle having an engine and a controller programmed to control a rate of the engine'"'"'s warm-up of according to the method is also disclosed.
14 Citations
20 Claims
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1. A method of controlling a rate of warm-up of an internal combustion engine fluidly connected to an exhaust system, the method comprising:
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identifying, via a controller, a cold-start of the engine; and regulating, via the controller, in response to the identified cold-start of the engine, an exhaust pressure modulation (EPM) valve arranged in a main exhaust passage of the exhaust system, wherein the main exhaust passage channels engine exhaust gas to the ambient, to restrict a flow of the engine exhaust gas to the ambient and increase exhaust gas backpressure in the main exhaust passage up to a predetermined pressure value to thereby increase a load on and the rate of warm-up of the engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A vehicle comprising:
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an internal combustion engine; an exhaust system fluidly connected to the engine and having a main exhaust passage configured to channel engine exhaust gas to the ambient; an exhaust pressure modulation (EPM) valve arranged in the main exhaust passage and configured to vary an exhaust backpressure in the main exhaust passage; and a controller configured to; identify a cold-start of the engine; and regulate, in response to the identified cold-start of the engine, the EPM valve to restrict a flow of the engine exhaust gas to the ambient and increase exhaust gas backpressure in the main exhaust passage up to a predetermined pressure value to thereby increase a load on and the rate of warm-up of the engine - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification