Internal combustion engine shutdown method and control system
First Claim
1. A method of controlling an internal combustion engine having a plurality of fuel injectors, an evaporative emission control system including a vapor management valve between a fuel tank and an engine intake manifold, and an EGR valve between an engine exhaust manifold and the intake manifold, comprising closing said vapor management valve and said EGR valve prior to disabling of said fuel injectors as part of an engine shutdown routine in response to an engine shutdown command and, after said closing, said routine commanding disabling of said fuel injectors in a manner to stop engine operation, thereby eliminating contributions of fuel to said intake manifold from said vapor management valve and said EGR valve prior to stopping of said engine.
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Accused Products
Abstract
Periodic shutdown of the internal combustion engine (12) during operation of a hybrid electric vehicle (HEV) is achieved by shutdown of a vapor management valve (VMV) of the engine evaporative emission control system and an EGR valve (150) of the tailpipe emission control system at the time an engine shutdown command is provided to a controlled engine shutdown routine that, after closing of the VMV and EGR valves, then commands disabling of the engine fuel injectors (160) in a manner to stop engine operation.
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Citations
12 Claims
- 1. A method of controlling an internal combustion engine having a plurality of fuel injectors, an evaporative emission control system including a vapor management valve between a fuel tank and an engine intake manifold, and an EGR valve between an engine exhaust manifold and the intake manifold, comprising closing said vapor management valve and said EGR valve prior to disabling of said fuel injectors as part of an engine shutdown routine in response to an engine shutdown command and, after said closing, said routine commanding disabling of said fuel injectors in a manner to stop engine operation, thereby eliminating contributions of fuel to said intake manifold from said vapor management valve and said EGR valve prior to stopping of said engine.
- 3. A method of controlling an internal combustion engine having a plurality of fuel injectors, an evaporative emission control system including a vapor management valve between a fuel tank and an engine intake manifold, and an EGR valve between an engine exhaust manifold and the intake manifold, comprising closing said vapor management valve and said EGR valve as part of an engine shutdown routine in response to an engine shutdown command and, after said closing, said routine commanding disabling of said fuel injectors in a sequence over a predetermined time period to stop engine operation.
- 6. For use with an internal combustion engine having a plurality of fuel injectors, an evaporative emission control system including a vapor management valve between a fuel tank and an engine intake manifold, and an EGR valve between an engine exhaust manifold and the intake manifold, an engine control system that commands closure of said vapor management valve and said EGR valve at a time when an engine shutdown command is received and that, after said closure, commands disabling of the fuel injectors in sequence over a predetermined time period to stop engine operation.
- 9. For use with an internal combustion engine having a plurality of fuel injectors, an evaporative emission control system including a vapor management valve between a fuel tank and an engine intake manifold, and an EGR valve between an engine exhaust manifold and the intake manifold, an engine control system that commands closure of said vapor management valve and said EGR valve prior to disabling of said fuel injectors when an engine shutdown command is received and that, after said closure, commands disabling of the fuel injectors in a manner to stop engine operation, thereby eliminating contributions of fuel to said intake manifold from said vapor management valve and said EGR valve prior to stopping of said engine.
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11. A hybrid electric vehicle having an electric motor, an internal combustion engine having a plurality of fuel injectors, an evaporative emission control system including a fuel vapor storage canister with a purge valve between a fuel tank and an engine intake manifold, and an EGR valve between an engine exhaust manifold and the intake manifold, and an engine control system for controlling said internal combustion engine and having an engine shutdown routine that commands closure of said purge valve and said EGR valve prior to disabling of said fuel injectors when an engine shutdown command is received and that, after said closure, commands disabling of said fuel injectors in a manner to stop engine operation, thereby eliminating contributions of fuel to said intake manifold from said purge valve and said EGR valve prior to stopping of said engine.
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12. An electronic memory containing a computer program to be executed by an engine controller which controls fuel injectors supplying fuel to the engine, a canister purge valve between a fuel tank and an engine intake manifold, and an EGR valve between an engine exhaust manifold and the intake manifold, comprising an engine shutdown code means that commands closure of said purge valve and said EGR valve prior to disabling of said fuel injectors when an engine shutdown command is received and that, after said closure, commands disabling of said fuel injectors in a manner to stop engine operation, thereby eliminating contributions of fuel to said intake manifold from said purge valve and said EGR valve prior to stopping of said engine.
Specification