Engine cranking system with cylinder deactivation for a direct injection engine
View Patent ↗An engine cranking system includes fuel injectors that are associated with multiple combustion chambers of an engine. The fuel injectors include a first fuel injector that is associated with a first combustion chamber. A second fuel injector is associated with a second combustion chamber. A control module is coupled to the fuel injectors and operates the first fuel injector in a deactivated state for a first chamber cycle during cranking of said engine. The first chamber cycle includes intake and exhaust strokes and is associated with a first combustion chamber.
1. An engine cranking system comprising:
a plurality of fuel injectors, associated with a plurality of combustion chambers of an engine, comprising:
a first fuel injector associated with a first combustion chamber; and
a second fuel injector associated with a second combustion chamber;
a control module that operates said first fuel injector in a deactivated state for a first chamber cycle and during cranking of said engine,
wherein said first chamber cycle includes intake and exhaust strokes and is associated with said first combustion chamber; and
at least one of an intake valve and an exhaust valve of said first combustion chamber,
wherein said control module maintains said at least one of said intake valve and said exhaust valve in a closed state during said intake and exhaust strokes.
2. The engine cranking system of claim 1 wherein said second fuel injector is an active state during a second chamber cycle, which occurs at least partially during said first chamber cycle.
3. The engine cranking system of claim 1 wherein said plurality of fuel injectors directly inject fuel into said plurality of combustion chambers.
4. The engine cranking system of claim 1 further comprising a fuel rail that supplies fuel to said plurality of fuel injectors.
5. The engine cranking system of claim 1 further comprising a pump that operates based on a rotation speed of said engine and supplies fuel to said plurality of injectors.
6. The engine cranking system of claim 5 wherein said engine comprises a crankshaft, and
wherein said pump operates based on rotation speed of said crankshaft.
7. The engine cranking system of claim 5 wherein said engine comprises a camshaft, and
wherein said pump operates based on rotation speed of said camshaft.
8. The engine cranking system of claim 1 further comprising a temperature sensor generating a temperature signal,
wherein said control module operates said first fuel injector in said deactivated state and said second fuel injector in said activated state based on said temperature signal.
9. The engine cranking system of claim 8 wherein said temperature sensor detects at least one of an ambient temperature and a transmission temperature.
10. The engine cranking system of claim 1 further comprising:
a fuel rail supplying fuel to said plurality of fuel injectors; and
a pressure sensor that is coupled to said fuel rail and that generates a pressure signal,
wherein said control module operates said first fuel injector in said deactivated state and said second fuel injector in an activated state based on said pressure signal.
11. The engine cranking system of claim 1 further comprising a starter that cranks said engine,
wherein said control module controls cranking speed of said engine during start up via said starter.
12. The engine cranking system of claim 1 wherein said engine comprises a valve train,
wherein said control module selectively opens and closes valves in said valve train for a chamber cycle based on state of said plurality of fuel injectors for that chamber cycle.
13. The engine cranking system of claim 1 wherein said engine comprises a valve train,
wherein said control module selectively opens and closes valves in said valve train during cranking of said engine.
14. The engine cranking system of claim 1 wherein said control module maintains said first fuel injector in a deactivated state during cranking of said engine.
15. The engine cranking system of claim 1 wherein said first chamber cycle includes a plurality of strokes of a piston within a combustion chamber.
16. The engine cranking system of claim 1 further comprising an ignition system igniting mixtures within said plurality of combustion chambers,
wherein said control module deactivates a portion of said ignition system associated with said first combustion chamber during said first chamber cycle.
17. The engine cranking system of claim 1 wherein said first chamber cycle includes a compression stroke and an ignition stroke.
18. The engine cranking system of claim 1 wherein said control module deactivates said first fuel injector based on a fuel pressure, a pressure output of a fuel pump, and a fuel injector size.
19. An engine system comprising:
an engine that has a combustion chamber with a chamber cycle;
a fuel injector associated with said combustion chamber;
a temperature sensor generating a temperature signal; a control module that operates said fuel injector in a deactivated state for said chamber cycle, which includes intake and exhaust strokes, during cranking of said engine and based on said temperature signal; and
at least one of an intake valve and an exhaust valve of said combustion chamber
wherein said control module maintains said at least one of said intake valve and said exhaust valve in a closed state during said intake and exhaust strokes.
20. The engine system of claim 19 wherein said control module operates said fuel injector in a deactivated state during cranking of said engine when said temperature signal is less than a predetermined threshold.
21. A method of starting an engine comprising:
cranking an engine including rotating said engine through a plurality of chamber cycles;
deactivating a fuel injector associated with a combustion chamber of said engine during intake and exhaust strokes of at least one of said chamber cycles; and
maintaining at least one of said intake valve and said exhaust valve of said combustion chamber in a closed state during said intake and exhaust strokes.