Control device for internal combustion engine

• US 5,219,398 A
• Filed: 08/05/1992
• Issued: 06/15/1993
• Est. Priority Date: 08/10/1990
• Status: Expired due to Term

• Current Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Original Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Yamaha Corporation)
• Inventors: Matsushita, Yukio, Nonaka, Kimihiro
• Primary Examiner(s): Nelli, Raymond A.
• Application Number:
  US07/927,053
• Time in Patent Office: 314 Days
• Field of Search: 123/414, 123/435, 123/73 R, 123/73 A, 123/478, 123/488, 123/494, 123/414, 73/118.2, 364/431.04, 324/208
• US Class Current: 123/406.58
• CPC Class Codes: F02B 2075/025 two
• CPC Class Codes: F02B 2075/125 Direct injection in the combustion chamber for spark ignition engines, i.e. not in pre-combustion chamber
• CPC Class Codes: F02B 61/045 for marine engines
• CPC Class Codes: F02B 75/22 with cylinders in V, fan, or star arrangement
• CPC Class Codes: F02D 2400/04 Two-stroke combustion engines with electronic control
• CPC Class Codes: F02D 41/345 Controlling injection timing F02D41/365 takes precedence
• CPC Class Codes: F02P 7/0775 Electronical verniers
• CPC Class Codes: G01M 15/06 by monitoring positions of pistons or cranks
• CPC Class Codes: G01M 15/09 by monitoring pressure in fluid ducts, e.g. in lubrication or cooling parts
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

This invention relates to an event timing apparatus for an internal combustion engine, and more particularly to an improved control arrangement for a fuel injection and ignition arrangement. In accordance with this invention, a timing detecting arrangement is disclosed having a timing correcting circuit for correcting deviations between the actual timing measurements made and the true, desired timing signal required for accurate operation of the fuel injection system. Thus, a fuel injection system and ignition system is provided that is able to provide accurate crank angle timing measurements with reference to which crank chamber pressure and other measurements may be made, in spite of possible manufacturing and/or assembling variations in the timing measuring means. The way in which the manufacturing or assembling of variations are measured is also disclosed.

Claims

1. In a event timing arrangement for an internal combustion engine having an engine output shaft, a pair of relatively moveable components defining a combustion chamber, at least one of said components being operably connected to said engine output shaft for driving said engine output shaft, and timing means for effecting a timed event for said engine at a predetermined angular position of said engine output shaft, the improvement comprising indicating means driven in timed relation to said engine output shaft, a signal generating means fixed relative to one of said engine components and juxtaposed to said indicating means for generating a basic timing signal in response to the passage of said indicating means past said signal generating means and an adjusting circuit for adjusting the output of said signal generating means in order to vary the timing of said signal to adjust for discrepancies in the relative locations of said indicating means and said signal generating means for initiating the operation of said timing means at a precise engine output shaft angle.

2. The timing arrangement of claim 1 further comprising a timing setting means for holding predetermined pre-set timing values for said timing means.

3. The timing arrangement of claim 2 wherein said adjusting circuit comprises a correction value generating device, and an adder for adding said correction value to said pre-set timing values.

4. The timing arrangement of claim 3 further including means for measuring the discrepancy between the relative location of the indicating means and the signal generating means and adjusting the adjusting circuit in response to such measurement.

5. The timing arrangement of claim 3 wherein said adjusting circuit further comprises a variable resistor and an analog/digital converter.

6. The timing arrangement of claim 3 wherein said adder is operative to add said correction value generated by said correction value generating device to each of a plurality said pre-set timing values provided by said timing setting means, thereby generating corrected timing values for each of said plurality of preset timing values.

7. The timing arrangement of claim 6 wherein said correction value is equal to the differences between a predetermined true timing value and said basic timing signal generated according to the measured shaft angle.

8. The timing arrangement of claim 1 further including an ignition system for firing a spark plug for the engine, and wherein the event timed is the firing of the spark plug.

9. The timing arrangement of claim 1 further including means for injecting fuel into the engine and wherein the event timed is the timing of the injection of fuel.

10. The timing arrangement of claim 9 wherein the timing of fuel injection is the initiation of the fuel injection.

11. The timing arrangement of claim 10 wherein the engine is a two cycle, crankcase compression engine and further including means for measuring the air flow to the engine by measuring the pressure differences in the crankcase at timed intervals.

12. The timing arrangement of claim 11 wherein said adjusting circuit comprises a correction value generating device, and an adder for adding said correction value to pre-set timing values.

13. The timing arrangement of claim 11 wherein the timing of the intervals at which the pressure is measured are also controlled by the event timing arrangement.

14. The timing arrangement of claim 13 wherein said adjusting circuit comprises a correction value generating device, and an adder for adding said correction value to pre-set timing values.

15. The timing arrangement of claim 14 further comprising a pressure sensing device for measuring the pressure within the crankcase chamber.

16. The timing arrangement of claim 15 further comprising a crankshaft rotatably disposed within said crankcase, and a piston rod connecting said piston to said crankshaft.

17. The timing arrangement of claim 16 wherein said pressure sensing device is positioned along a region of said crankcase which is remote from said piston, said piston rod and said crankshaft.

18. The timing arrangement of claim 17 wherein said pressure sensing device comprises a pressure inlet pipe having an opening at an outer tip.

19. The timing arrangement of claim 18 wherein said pressure inlet pipe projects through said crankcase and extends inwardly into said crankcase chamber, beyond an inner wall of said crankcase.

20. The timing arrangement of claim 18 wherein said pressure inlet pipe projects through said crankcase, and said opening at said tip of said pressure inlet pipe is coextensive with, and conforms to the curvature of, an inner wall of said crankcase.

21. The timing arrangement of claim 20 wherein an axis extending from said pressure sensing device, through said pressure inlet pipe, is angled downwardly with respect to said inner wall of said crankcase toward a lowermost region of said crankcase chamber.

22. The timing arrangement of claim 15 wherein said pressure sensing device is operative to measure said pressure within said crankcase at said corrected scavenging port opening timing value and at said corrected scavenging for closing timing value.

23. The timing arrangement of claim 22 further comprising an air intake amount calculating system operational to receive said corrected timing values and said air pressure measurements in order to calculate an intake air mass value.

24. The timing arrangement of claim 23 further comprising means for controlling the amount of fuel delivered by said fuel injection device.

25. The timing arrangement of claim 24 wherein said fuel injection amount controlling means includes an electronic control unit, said electric control unit operable to receive various input signals, indicative of engine operating conditions, and to output a control signal for controlling said fuel injection device.

26. The timing arrangement of claim 25 wherein said input signals include said intake air mass value.

27. The timing arrangement of claim 8 further comprising an ignition control circuit having an arrangement for determining a measured ignition timing value.

28. The timing arrangement of claim 27 wherein said adjusting circuit comprises a correction value generating device and an adder for adding said timing correction value to said measured ignition timing value, thereby generating a corrected ignition timing value.

29. The timing arrangement of claim 28 wherein said adjusting circuit further comprises a variable resistor and an analog/digital converter.

30. The timing arrangement of claim 29 wherein said correction value is equal to the difference between a predetermined true timing value and said basic timing signal generated according to the measured crank angle.

31. In a event timing method for an internal combustion engine having an engine output shaft, a pair of relatively moveable components defining a combustion chamber, at least one of said components being operably connected to said engine output shaft for driving said engine output shaft, and timing means for effecting a timed event for said engine at a predetermined angular position of said engine output shaft, indicating means driven in timed relation to said engine output shaft, a signal generating means fixed relative to one of said engine components and juxtaposed to said indicating means for generating a basic timing signal in response to the passage of said indicating means past said signal generating means, said method comprising the steps of adjusting the output of said signal generating means in order to vary the timing of said signal to adjust for discrepancies in the relative locations of said indicating means and said signal generating means for initiating the operation of said timing means at a precise engine output shaft angle.

32. The timing method of claim 31 further comprising a timing setting means for holding predetermined pre-set timing values for said timing means.

33. The timing method of claim 32 wherein said adjusting circuit comprises a correction value generating device, and an adder for adding said correction value to said pre-set timing values.

34. The timing method of claim 33 further including means the steps of measuring the discrepancy between the relative location of the indicating means and the signal generating means and adjusting the adjusting circuit in response to such measurement.

35. The timing method of claim 33 wherein said adjusting circuit further comprises a variable resistor and an analog/digital converter.

36. The timing method of claim 33 wherein said adder is operative to add said correction value generated by said correction value generating device to each of a plurality said pre-set timing values provided by said timing setting means, thereby generating corrected timing values for each of said plurality of preset timing values.

37. The timing method of claim 36 wherein said correction value is equal to the difference between a predetermined true timing value and said basic timing signal generated according to the measured shaft angle.

38. The timing method of claim 31 further including an ignition system for firing a spark plug for the engine, and wherein the event timed is the firing of the spark plug.

39. The timing method of claim 31 further including means for injecting fuel into the engine and wherein the event timing is the timing of the injection of fuel.

40. The timing method of claim 39 wherein the timing of fuel injection is the initiation of the fuel injection.

41. The timing method of claim 40 wherein the engine is a two cycle, crankcase compression engine and further including means for measuring the air flow to the engine by measuring the pressure differences in the crankcase at timed intervals.

42. The timing method of claim 41 wherein said adjusting circuit comprises a correction value generating device, and an adder for adding said correction value to said pre-set timing values.

43. The timing method of claim 41 wherein the timing of the intervals at which the pressure is measured are also controlled by the event timing arrangement.

44. The timing method of claim 43 wherein said adjusting circuit comprises a correction value generating device, and an adder for adding said correction value to said pre-set timing values.

45. The timing method of claim 44 further comprising a pressure sensing device for measuring the pressure within the crankcase chamber.

46. The timing method of claim 45 further comprising a crankshaft rotatably disposed within said crankcase, and a piston rod connecting said piston to said crankshaft.

47. The timing method of claim 46 wherein said pressure sensing device is positioned along a region of said crankcase which is remote from said piston, said piston rod and said crankshaft.

48. The timing method of claim 47 wherein said pressure sensing device comprises a pressure inlet pipe having an opening at an outer tip.

49. The timing method of claim 48 wherein said pressure inlet pipe projects through said crankcase and extends inwardly into said crankcase chamber, beyond an inner wall of said crankcase.

50. The timing method of claim 48 wherein said pressure inlet pipe projects through said crankcase, and said opening at said tip of said pressure inlet pipe is coextensive with, and conforms to the curvature of, an inner wall of said crankcase.

51. The timing method of claim 50 wherein an axis extending from said pressure sensing device, through said pressure inlet pipe, is angled downwardly with respect to said inner wall of said crankcase toward a lowermost region of said crankcase chamber.

52. The timing method of claim 45 wherein said pressure sensing device is operative to measure said pressure within said crankcase at said corrected scavenging port opening timing value and at said corrected scavenging port closing timing value.

53. The timing method of claim 52 further comprising an air intake amount calculating system operational to receive said corrected timing values and said air pressure measurements in order to calculate an intake air mass value.

54. The timing method of claim 53 further comprising means for controlling the amount of fuel delivered by said fuel injection device.

55. The timing method of claim 54 wherein said fuel injection amount controlling means includes an electronic control unit, said electric control unit operable to receive various input signals, indicative of engine operating conditions, and to output a control signal for controlling said fuel injection device.

56. The timing method of claim 55 wherein said input signals include said intake air mass value.

57. The timing method of claim 38 further comprising an ignition control circuit having an arrangement for determining a measured ignition timing value.

58. The timing method of claim 57 wherein said adjusting circuit comprises a correction value generating device and an adder for adding said timing correction value to said measured ignition timing value, thereby generating a corrected ignition timing value.

59. The timing method of claim 58 wherein said adjusting circuit further comprises a variable resistor and an analog/digital converter.

60. The timing method of claim 59 wherein said correction value is equal to the difference between a predetermined true timing value and said basic timing signal generated according to the measured crank angle.