Control apparatus for direct injection engine

Patent metadata

Field	Value
Publication number	US-9611796-B2
Application number	US-201615042047-A
Country	US
Kind code	B2
Filing date	Feb 11, 2016
Priority date	Mar 17, 2015
Publication date	Apr 4, 2017
Grant date	Apr 4, 2017

Abstract

A cylinder-injection-engine control apparatus includes a fuel injection controller that executes air purge control for performing fuel injection in an intake stroke if fuel pressure is below a predetermined pressure when an engine starts. When executing the air purge control, the fuel injection controller makes a fuel injection time of an injector longer than when the fuel pressure is higher than or equal to the predetermined pressure. When executing the air purge control, if the amount of fuel in a fuel tank is larger than or equal to a predetermined amount and an integrated value of a fuel injection amount (integrated injection amount) since start of the fuel injection is larger than or equal to a predetermined value, the fuel injection controller stops the air purge control.

First claim

The invention claimed is:

1. A control apparatus for a direct injection engine, the control apparatus comprising:
a fuel pressure detector that detects fuel pressure of fuel to be fed to at least one injector that injects the fuel into a corresponding cylinder of the engine; and
a fuel injection controller that executes air purge control for performing fuel injection in an intake stroke of the engine if the fuel pressure detected by the fuel pressure detector is below a predetermined pressure when the engine starts.

2. The control apparatus for a direct injection engine according to claim 1 ,
wherein when executing the air purge control, the fuel injection controller makes a fuel injection time of the injector longer than when the fuel pressure is higher than or equal to the predetermined pressure.

3. The control apparatus for a direct injection engine according to claim 1 ,
wherein when executing the air purge control, the fuel injection controller performs a single injection process in the intake stroke.

4. The control apparatus for a direct injection engine according to claim 2 ,
wherein when executing the air purge control, the fuel injection controller performs a single injection process in the intake stroke.

5. The control apparatus for a direct injection engine according to claim 1 ,
wherein if the fuel pressure falls below the predetermined pressure after the engine is cranked and transitions from initial explosion to complete explosion, the fuel injection controller executes the air purge control.

6. The control apparatus for a direct injection engine according to claim 2 ,
wherein if the fuel pressure falls below the predetermined pressure after the engine is cranked and transitions from initial explosion to complete explosion, the fuel injection controller executes the air purge control.

7. The control apparatus for a direct injection engine according to claim 3 ,
wherein if the fuel pressure falls below the predetermined pressure after the engine is cranked and transitions from initial explosion to complete explosion, the fuel injection controller executes the air purge control.

8. The control apparatus for a direct injection engine according to claim 4 ,
wherein if the fuel pressure falls below the predetermined pressure after the engine is cranked and transitions from initial explosion to complete explosion, the fuel injection controller executes the air purge control.

9. The control apparatus for a direct injection engine according to claim 1 , further comprising:
a fuel amount detector that detects an amount of fuel retained in a fuel tank; and
an integrator that integrates a fuel injection amount since start of the fuel injection,
wherein when executing the air purge control, if the amount of fuel detected by the fuel amount detector is larger than or equal to a predetermined amount and an integrated value of the fuel injection amount integrated by the integrator is larger than or equal to a predetermined value, the fuel injection controller stops the air purge control.

10. The control apparatus for a direct injection engine according to claim 2 , further comprising:
a fuel amount detector that detects an amount of fuel retained in a fuel tank; and
an integrator that integrates a fuel injection amount since start of the fuel injection,
wherein when executing the air purge control, if the amount of fuel detected by the fuel amount detector is larger than or equal to a predetermined amount and an integrated value of the fuel injection amount integrated by the integrator is larger than or equal to a predetermined value, the fuel injection controller stops the air purge control.

11. The control apparatus for a direct injection engine according to claim 3 , further comprising:
a fuel amount detector that detects an amount of fuel retained in a fuel tank; and
an integrator that integrates a fuel injection amount since start of the fuel injection,
wherein when executing the air purge control, if the amount of fuel detected by the fuel amount detector is larger than or equal to a predetermined amount and an integrated value of the fuel injection amount integrated by the integrator is larger than or equal to a predetermined value, the fuel injection controller stops the air purge control.

12. The control apparatus for a direct injection engine according to claim 4 , further comprising:
a fuel amount detector that detects an amount of fuel retained in a fuel tank; and
an integrator that integrates a fuel injection amount since start of the fuel injection,
wherein when executing the air purge control, if the amount of fuel detected by the fuel amount detector is larger than or equal to a predetermined amount and an integrated value of the fuel injection amount integrated by the integrator is larger than or equal to a predetermined value, the fuel injection controller stops the air purge control.

13. The control apparatus for a direct injection engine according to claim 9 ,
wherein the predetermined value is set in accordance with a capacity of components and pipes constituting a fuel feed system from a low-pressure fuel pump, which suctions up the fuel retained in the fuel tank, to the injector.

14. The control apparatus for a direct injection engine according to claim 10 ,
wherein the predetermined value is set in accordance with a capacity of components and pipes constituting a fuel feed system from a low-pressure fuel pump, which suctions up the fuel retained in the fuel tank, to the injector.

15. The control apparatus for a direct injection engine according to claim 11 ,
wherein the predetermined value is set in accordance with a capacity of components and pipes constituting a fuel feed system from a low-pressure fuel pump, which suctions up the fuel retained in the fuel tank, to the injector.

16. The control apparatus for a direct injection engine according to claim 12 ,
wherein the predetermined value is set in accordance with a capacity of components and pipes constituting a fuel feed system from a low-pressure fuel pump, which suctions up the fuel retained in the fuel tank, to the injector.

17. The control apparatus for a direct injection engine according to claim 1 ,
wherein when executing the air purge control, if a state where a difference between an actual fuel pressure detected by the fuel pressure detector and a fuel-pressure control target value is within a predetermined tolerance continues for a predetermined time or longer, the fuel injection controller stops the air purge control.

18. The control apparatus for a direct injection engine according to claim 2 ,
wherein when executing the air purge control, if a state where a difference between an actual fuel pressure detected by the fuel pressure detector and a fuel-pressure control target value is within a predetermined tolerance continues for a predetermined time or longer, the fuel injection controller stops the air purge control.

19. The control apparatus for a direct injection engine according to claim 3 ,
wherein when executing the air purge control, if a state where a difference between an actual fuel pressure detected by the fuel pressure detector and a fuel-pressure control target value is within a predetermined tolerance continues for a predetermined time or longer, the fuel injection controller stops the air purge control.

20. The control apparatus for a direct injection engine according to claim 4 ,
wherein when executing the air purge control, if a state where a difference between an a

Assignees

• Fuji Heavy Ind Ltd

Inventors

• Namekawa Yoshitaka

Classifications

• F02D2200/0616

  determined by estimation · CPC title

• F02D41/062 Primary

  for starting (F02D41/061 takes precedence) · CPC title

• F02D2041/389

  for injecting directly into the cylinder · CPC title

• F02D2200/0602

  Fuel pressure · CPC title

• F02D41/3845

  by controlling the flow into the common rail, e.g. the amount of fuel pumped · CPC title