Startup-time control apparatus and stop-time control apparatus of internal combustion engine, and control methods thereof, and record medium

• US 20030051692A1
• Filed: 08/23/2002
• Published: 03/20/2003
• Est. Priority Date: 09/11/2001
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Mizutani, Koichi
• Granted Patent: US 6,986,331 B2
• Time in Patent Office: Days
• US Class Current: 123/179.15
• CPC Class Codes: F01P 2023/08 Microprocessor; Microcomputer
• CPC Class Codes: F01P 2031/30 Cooling after the engine is stopped
• CPC Class Codes: F01P 2037/02 starting
• CPC Class Codes: F01P 5/04 Pump-driving arrangements
• CPC Class Codes: F01P 5/10 Pumping liquid coolant; Arrangements of coolant pumps
• CPC Class Codes: F01P 7/08 by cutting in or out of pumps
• CPC Class Codes: F01P 7/16 by thermostatic control
• CPC Class Codes: F01P 7/162 by cutting in and out of pumps
• CPC Class Codes: F02D 11/105 characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
• CPC Class Codes: F02D 2011/102 at least one throttle being moved only by an electric actuator
• CPC Class Codes: F02D 2011/104 using electric step motors
• CPC Class Codes: F02D 2041/0095 Synchronisation of the cylinders during engine shutdown
• CPC Class Codes: F02D 2041/389 for injecting directly into the cylinder
• CPC Class Codes: F02D 2200/501 Vehicle speed
• CPC Class Codes: F02D 2200/602 Pedal position
• CPC Class Codes: F02D 2200/604 Engine control mode selected by driver, e.g. to manually start particle filter regeneration or to select driving style
• CPC Class Codes: F02D 31/002 controlling air supply
• CPC Class Codes: F02D 35/025 by determining temperatures inside the cylinder, e.g. combustion temperatures
• CPC Class Codes: F02D 41/042 for stopping the engine
• CPC Class Codes: F02D 41/065 at hot start or restart F02D41/067 takes precedence
• CPC Class Codes: F02D 41/3094 : the fuel injection being effected by at least two different injectors, e.g. one in the intake manifold and one in the cylinder
• CPC Class Codes: F02D 41/3809 : Common rail control systems common rail apparatus F02M55/025, F02M63/0225
• CPC Class Codes: F02D 41/401 : Controlling injection timing F02D41/402 takes precedence
• CPC Class Codes: F02D 41/402 : Multiple injections
• CPC Class Codes: F02N 11/0814 : comprising means for controlling automatic idle-start-stop
• CPC Class Codes: F02N 19/02 : Aiding engine start by thermal means, e.g. using lighted wicks
• CPC Class Codes: Y02T 10/40 : Engine management systems

Abstract

If it is determined that the present engine startup is a high-temperature startup, immediately fuel injection in concert with start of cranking is prohibited. After a delay time elapses following the start of cranking, or when THC<THCh is satisfied, fuel injection is started. Therefore, the cranking during the delay time cools interior of the combustion chambers. Since fuel injection starts after the cooling, pre-ignition can be prevented.

Claims

1. A startup-time control apparatus of an internal combustion engine in which fuel is injected into a combustion chamber, comprising:

a high-temperature startup determining portion that determines whether the internal combustion engine is in a high-temperature state at a time of startup of the internal combustion engine; and

a fuel injection start timing setting portion that sets an injection timing of an injection valve such that fuel injection starts after a delay period elapses following a start of cranking if the high-temperature startup determining portion determines that the internal combustion engine is in the high-temperature state at the time of startup.

2. The control apparatus according to claim 1, wherein the delay period is a length of time that is needed for an engine cooling water present outside the engine immediately prior to the start of cranking to reach a surrounding of the combustion chamber and reduce a temperature in the combustion chamber.

3. A startup-time control apparatus of an internal combustion engine in which fuel is injected into a combustion chamber, and in which an automatic stop-automatic startup control of automatically stopping a combustion operation if an automatic stop condition is met, and of automatically restarting the combustion operation if an automatic start condition is met, is performed, the control apparatus comprising:

an automatic startup determining portion that determines whether the combustion operation has been automatically restarted; and

a fuel injection start timing setting portion that sets an injection timing of an injection valve such that fuel injection starts after a delay period elapses following a start of cranking if the automatic startup determining portion determines that the combustion operation is automatically restarted.

4. The control apparatus according to claim 3, wherein the delay period is a length of time that is needed for an engine cooling water present outside the engine immediately prior to the start of cranking to reach a surrounding of the combustion chamber and reduce a temperature in the combustion chamber.

5. A startup-time control apparatus of an internal combustion engine in which fuel is injected into a combustion chamber, comprising:

a high-temperature startup determining portion that determines whether the internal combustion engine is in a high-temperature state at a time of startup of the internal combustion engine; and

a startup-time fuel injection amount setting portion that sets a smaller amount of fuel injection at a time of startup if the high-temperature startup determining portion determines that the internal combustion engine is in the high-temperature state at the time of startup than if the internal combustion engine is not in the high-temperature state at the time of startup.

6. A startup-time control apparatus of an internal combustion engine in which fuel is injected into a combustion chamber, and in which an automatic stop-automatic startup control of automatically stopping a combustion operation if an automatic stop condition is met, and of automatically restarting the combustion operation if an automatic start condition is met, is performed, the control apparatus comprising:

an automatic startup determining portion that determines whether the combustion operation has been automatically restarted; and

a startup-time fuel injection amount setting portion that, if the automatic startup determining portion determines that the combustion operation has been automatically restarted, sets an amount of fuel injection at a time of startup as an amount that is smaller than the amount of fuel injection set at a time of startup caused by a startup operation performed by an operator.

7. A startup-time control apparatus in which fuel injection into a combustion chamber and fuel injection into an intake passage are possible, comprising:

a high-temperature startup determining portion that determines whether the internal combustion engine is in a high-temperature state at a time of startup of the internal combustion engine; and

a startup-time fuel injection selecting portion which accomplishes the fuel injection at the time of startup by performing the fuel injection into the combustion chamber or the fuel injection into both the combustion chamber and the intake passage if the high-temperature startup determining portion determines that the internal combustion engine is not in the high-temperature state at the time of startup, and which accomplishes the fuel injection at the time of startup by performing the fuel injection into the intake passage if the high-temperature startup determining portion determines that the internal combustion engine is in the high-temperature state at the time of startup.

8. A startup-time control apparatus of an internal combustion engine in which fuel injection into a combustion chamber and fuel injection into an intake passage are possible, and in which an automatic stop-automatic startup control of automatically stopping a combustion operation if an automatic stop condition is met, and of automatically restarting the combustion operation if an automatic start condition is met, is performed, the control apparatus comprising:

an automatic startup determining portion that determines whether the combustion operation has been automatically restarted; and

a startup-time fuel injection selecting portion which accomplishes the fuel injection at the time of startup by performing the fuel injection into the combustion chamber or the fuel injection into both the combustion chamber and the intake passage if the startup is other than a case where the automatic startup determining portion determines that the combustion operation has been automatically restarted, and which accomplishes the fuel injection at the time of startup by performing the fuel injection into the intake passage if the automatic startup determining portion determines that the combustion operation has been automatically restarted.

9. A stop-time control apparatus of an internal combustion engine in which fuel is injected into a combustion chamber, and in which an automatic stop-automatic startup control of automatically stopping a combustion operation if an automatic stop condition is met, and of automatically restarting the combustion operation if an automatic start condition is met, is performed, the control apparatus comprising:

a high-temperature stop determining portion that determines whether the internal combustion engine is in a high-temperature state when the automatic stop condition is met; and

an automatic stop execution control portion which executes automatic stop of the combustion operation if the high-temperature stop determining portion determines that the internal combustion engine is not in the high-temperature state when the automatic stop condition is met, and which prohibits the automatic stop of the combustion operation if the high-temperature stop determining portion determines that the internal combustion engine is in the high-temperature state when the automatic stop condition is met.

10. A stop-time control apparatus of an internal combustion engine in which fuel is injected into a combustion chamber, and in which an automatic stop-automatic startup control of automatically stopping a combustion operation if an automatic stop condition is met, and of automatically restarting the combustion operation if an automatic start condition is met, is performed, the control apparatus comprising:

an automatic stop determining portion that determines whether the combustion operation has been automatically stopped; and

a pre-startup cooling portion that drives a cooling device of the internal combustion engine to cool the internal combustion engine during a stop of the combustion operation if the automatic stop determining portion determines that the combustion operation has been automatically stopped.

11. The control apparatus according to claim 10, wherein the pre-startup cooling portion drives the cooling device of the internal combustion engine by electric energy.

12. The control apparatus according to claim 10, further comprising a high-temperature determining portion that determines whether the internal combustion engine is in a high-temperature state,

wherein the pre-startup cooling portion drives the cooling device of the internal combustion engine if the high-temperature determining portion determines that the internal combustion engine is in the high-temperature state during an automatically-caused stop of the combustion operation.

13. A startup-time control apparatus of an internal combustion engine in which fuel is injected into a combustion chamber, comprising:

a high-temperature startup determining portion that determines whether the internal combustion engine is in a high-temperature state at a time of startup; and

a pre-fuel injection setting portion that sets an injection timing of an injection valve such that fuel is injected into the combustion chamber prior to cranking if the high-temperature startup determining portion determines that the internal combustion engine is in the high-temperature state at the time of startup.

14. A startup-time control apparatus of an internal combustion engine in which fuel is injected into a combustion chamber, and in which an automatic stop-automatic startup control of automatically stopping a combustion operation if an automatic stop condition is met, and of automatically restarting the combustion operation if an automatic start condition is met, is performed, the control apparatus comprising:

an automatic startup determining portion that determines whether the combustion operation has been automatically restarted; and

a pre-fuel injection setting portion that sets an injection timing of an injection valve such that fuel is injected into the combustion chamber prior to cranking if the automatic startup determining portion determines that the combustion operation has been automatically restarted.

15. A stop-time control apparatus of an internal combustion engine in which fuel is injected into a combustion chamber, comprising:

a high-temperature determining portion that determines whether the internal combustion engine is in a high-temperature state; and

a during-stop fuel injection setting portion that sets an injection timing of an injection valve such that fuel is injected into the combustion chamber if the high-temperature determining portion determines that the internal combustion engine is in the high-temperature state during a stop of rotation of the internal combustion engine.

16. The control apparatus according to claim 15, wherein the during-stop fuel injection setting portion sets an injection timing of an injection valve such that fuel is injected into the combustion chamber if the high-temperature determining portion determines that the internal combustion engine is in the high-temperature state immediately after the internal combustion engine stops rotating in association with a stop of a combustion operation.

17. A stop-time control apparatus of an internal combustion engine in which fuel is injected into a combustion chamber, and in which an automatic stop-automatic startup control of automatically stopping a combustion operation if an automatic stop condition is met, and of automatically restarting the combustion operation if an automatic start condition is met, is performed, the control apparatus comprising:

an automatic stop determining portion that determines whether the combustion operation has been automatically stopped; and

a stop-time fuel injection setting portion that sets an injection timing of an injection valve such that fuel is injected into the combustion chamber immediately after a stop of rotation of the internal combustion engine if the automatic stop determining portion determines that the combustion operation has been automatically stopped.

18. A startup-time control method of an internal combustion engine in which fuel is injected into a combustion chamber, comprising

determining whether the internal combustion engine is in a high-temperature state at a time of startup of the internal combustion engine;

and

setting an injection timing of an injection valve such that fuel injection starts after a delay period elapses following a start of cranking if it is determined that the internal combustion engine is in the high-temperature state at the time of startup.

19. The control method according to claim 18, wherein the delay period is a length of time that is needed for an engine cooling water present outside the engine immediately prior to the start of cranking to reach a surrounding of the combustion chamber and reduce a temperature in the combustion chamber.

35. A medium storing a program for executing the method described in claim 18.

36. A medium storing a program for executing the method described in claim 19.

20. A startup-time control method of an internal combustion engine in which fuel is injected into a combustion chamber, and in which an automatic stop-automatic startup control of automatically stopping a combustion operation if an automatic stop condition is met, and of automatically restarting the combustion operation if an automatic start condition is met, is performed, the control method comprising:

setting an injection timing of an injection valve such that fuel injection starts after a delay period elapses following a start of cranking if the combustion operation is automatically restarted.

21. The control method according to claim 20, wherein the delay period is a length of time that is needed for an engine cooling water present outside the engine immediately prior to the start of cranking to reach a surrounding of the combustion chamber and reduce a temperature in the combustion chamber.

37. A medium storing a program for executing the method described in claim 20.

38. A medium storing a program for executing the method described in claim 21.

22. A startup-time control method of an internal combustion engine in which fuel is injected into a combustion chamber, comprising:

determining whether the internal combustion engine is in a high-temperature state at a time of startup of the internal combustion engine; and

setting a smaller amount of fuel injection at a time of startup if it is determined that the internal combustion engine is in the high-temperature state at the time of startup than if the internal combustion engine is not in the high-temperature state at the time of startup.

39. A medium storing a program for executing the method described in claim 22.

23. A startup-time control method of an internal combustion engine in which fuel is injected into a combustion chamber, and in which an automatic stop-automatic startup control of automatically stopping a combustion operation if an automatic stop condition is met, and of automatically restarting the combustion operation if an automatic start condition is met, is performed, the control method comprising:

setting a smaller amount of fuel injection when the combustion operation is automatically restarted than when startup is caused by a startup operation performed by an operator.

40. A medium storing a program for executing the method described in claim 23.

24. A startup-time control method in which fuel injection into a combustion chamber and fuel injection into an intake passage are possible, comprising:

determining whether the internal combustion engine is in a high-temperature state at a time of startup of the internal combustion engine;

accomplishing the fuel injection at the time of startup by performing the fuel injection into the combustion chamber or the fuel injection into both the combustion chamber and the intake passage if it is determined that the internal combustion engine is not in the high-temperature state at the time of startup; and

accomplishing the fuel injection at the time of startup by performing the fuel injection into the intake passage if it is determined that the internal combustion engine is in the high-temperature state at the time of startup.

41. A medium storing a program for executing the method described in claim 24.

25. A startup-time control method of an internal combustion engine in which fuel injection into a combustion chamber and fuel injection into an intake passage are possible, and in which an automatic stop-automatic startup control of automatically stopping a combustion operation if an automatic stop condition is met, and of automatically restarting the combustion operation if an automatic start condition is met, is performed, the control method comprising:

accomplishing the fuel injection at the time of startup by performing the fuel injection into the combustion chamber or the fuel injection into both the combustion chamber and the intake passage if the startup is other than a case where the combustion operation is automatically restarted; and

accomplishing the fuel injection at the time of startup by performing the fuel injection into the intake passage if the combustion operation is automatically restarted.

42. A medium storing a program for executing the method described in claim 25.

26. A stop-time control method of an internal combustion engine in which fuel is injected into a combustion chamber, and in which an automatic stop-automatic startup control of automatically stopping a combustion operation if an automatic stop condition is met, and of automatically restarting the combustion operation if an automatic start condition is met, is performed, the control method comprising:

determining whether the internal combustion engine is in a high-temperature state when the automatic stop condition is met;

executing automatic stop of the combustion operation if it is determined that the internal combustion engine is not in the high-temperature state when the automatic stop condition is met; and

prohibiting the automatic stop of the combustion operation if it is determined that the internal combustion engine is in the high-temperature state when the automatic stop condition is met.

43. A medium storing a program for executing the method described in claim 26.

27. A stop-time control method of an internal combustion engine in which fuel is injected into a combustion chamber, and in which an automatic stop-automatic startup control of automatically stopping a combustion operation if an automatic stop condition is met, and of automatically restarting the combustion operation if an automatic start condition is met, is performed, the control method comprising:

driving a cooling device of the internal combustion engine to cool the internal combustion engine during an automatically-caused stop of the combustion operation.

28. The control method according to claim 27, wherein the pre-startup cooling portion drives the cooling device of the internal combustion engine by electric energy.

29. The control method according to claim 27, further comprising:

determining whether the internal combustion engine is in a high-temperature state; and

driving the cooling device of the internal combustion engine if it is determined that the internal combustion engine is in the high-temperature state during an automatically-caused stop of the combustion operation.

44. A medium storing a program for executing the method described in claim 27.

45. A medium storing a program for executing the method described in claim 28.

46. A medium storing a program for executing the method described in claim 29.

30. A startup-time control method of an internal combustion engine in which fuel is injected into a combustion chamber, comprising:

determining whether the internal combustion engine is in a high-temperature state at a time of startup; and

setting an injection timing of an injection valve such that fuel is injected into the combustion chamber prior to cranking if it is determined that the internal combustion engine is in the high-temperature state at the time of startup.

47. A medium storing a program for executing the method described in claim 30.

31. A startup-time control method of an internal combustion engine in which fuel is injected into a combustion chamber, and in which an automatic stop-automatic startup control of automatically stopping a combustion operation if an automatic stop condition is met, and of automatically restarting the combustion operation if an automatic start condition is met, is performed, the control method comprising:

setting an injection timing of an injection valve such that fuel is injected into the combustion chamber prior to cranking at a time of an automatic startup.

48. A medium storing a program for executing the method described in claim 31.

32. A stop-time control method of an internal combustion engine in which fuel is injected into a combustion chamber, comprising:

determining whether the internal combustion engine is in a high-temperature state; and

setting an injection timing of an injection valve such that fuel is injected into the combustion chamber if it is determined that the internal combustion engine is in the high-temperature state during a stop of rotation of the internal combustion engine.

33. The control method according to claim 32, wherein a setting the injection valve such that fuel is injected into the combustion chamber if it is determined that the internal combustion engine is in the high-temperature state immediately after the internal combustion engine stops rotating in association with a stop of a combustion operation.

49. A medium storing a program for executing the method described in claim 32.

50. A medium storing a program for executing the method described in claim 33.

34. A stop-time control method of an internal combustion engine in which fuel is injected into a combustion chamber, and in which an automatic stop-automatic startup control of automatically stopping a combustion operation if an automatic stop condition is met, and of automatically restarting the combustion operation if an automatic start condition is met, is performed, the control method comprising:

setting an injection timing of an injection valve such that fuel is injected into the combustion chamber immediately after rotation of the internal combustion engine is stopped by an automatic stop of the combustion operation.

51. A medium storing a program for executing the method described in claim 34.