Engine

• US 8,166,951 B2
• Filed: 04/19/2007
• Issued: 05/01/2012
• Est. Priority Date: 05/11/2006
• Status: Expired due to Fees

• Current Assignee: Yanmar Company Limited (Yanmar Holdings Co., Ltd.)
• Original Assignee: Yanmar Company Limited (Yanmar Holdings Co., Ltd.)
• Inventors: Takahashi, Takeshi, Yoshizuka, Tooru, Shinohara, Yukihiro, Ooshima, Keiji, Itatsu, Toshiro
• Primary Examiner(s): SOLIS, ERICK R
• Application Number:
  US12/300,394
• Publication Number:
  US 20100006077A1
• Time in Patent Office: 1,839 Days
• Field of Search: 123/406.58, 123/406.6, 123/406.64, 123/406.65, 123/436, 731/140.4, 731/141.1, 731/141.5, 731/142.2
• US Class Current: 123/436
• CPC Class Codes: F02D 2200/1004 Estimation of the output torque
• CPC Class Codes: F02D 41/0097 using means for generating speed signals

Abstract

An engine includes an angular velocity detecting means 10 for detecting a rotation angular velocity of a crankshaft 11 of the engine, a torque generated by the engine detecting means for detecting a variability of the angular velocity amplitude obtained by the angular velocity detecting means 10 as the variability of the torque generated by the engine. The engine compensates a fuel injection quantity by comparing the angular velocity amplitude detected by the angular velocity detecting means with the adequate angular velocity amplitude.

Claims

1. An engine comprising:

an engine torque detection means including an angular velocity detecting means for detecting a rotation angular velocity of a crankshaft of an engine,

wherein the engine torque detection means detects a variability of an angular velocity amplitude obtained by the angular velocity detecting means as the variability of the torque generated by the engine;

a load detecting means for detecting an engine load;

a rotation number detecting means for detecting the engine rotation number;

an injection quantity map for calculating the fuel injection quantity based on the load by the load detecting means and the rotation number by the rotation number detecting means;

an angular velocity amplitude map that represents an assumed angular velocity amplitude that is defined by the rotation number detected by the rotation number detecting means and by the injection quantity calculated using the injection quantity map; and

an injection quantity compensation means for compensating the injection quantity map by comparing the angular velocity amplitude detected by the engine torque detection means with the assumed angular velocity amplitude determined using the angular velocity amplitude map.

2. The engine as set forth in claim 1, wherein the angular velocity amplitude is a relative angular velocity amplitude to an average angular velocity or an absolute value of the angular velocity amplitude.

3. The engine as set forth in claim 1, wherein the angular velocity amplitude is only a larger angular velocity amplitude than an average angular velocity.

4. The engine as set forth in claim 1, wherein the angular velocity amplitude is an angular velocity amplitude of the engine rotation toward the angle of the engine rotation, or the angular velocity amplitude of the engine rotation with respect to time.

5. The engine as set forth in claim 1, further comprising:

a cylinder difference torque compensating means including the angular velocity detecting means and the injection maps provided in the respective cylinders, wherein the angular velocity amplitude of one cylinder detects an angular velocity amplitude, and the cylinder difference torque compensating means compensates the injection quantity map or maps of another cylinder or other cylinders so as to conform the angular velocity amplitudes detected by the angular velocity detecting means of the other cylinder or cylinders to the angular velocity amplitude detected by the angular velocity detecting means of the one cylinder.

6. The engine as set forth in claim 1, further comprising:

an exhaust gas temperature detecting means for detecting the exhaust gas temperature, and

an injection quantity compensation value confirming means, wherein the injection quantity compensation value confirming means evaluates that the injection quantity map compensated by the injection quantity compensation means is normal if the exhaust gas temperature detected by the exhaust gas temperature detecting means is within the prescribed area, and wherein the injection quantity compensation value confirming means evaluates that the injection quantity map is abnormal if the exhaust gas temperature is beyond the prescribed area.

7. The engine as set forth in claim 5, further comprising:

an exhaust gas temperature detecting means for detecting the exhaust gas temperature, and

an injection quantity compensation value confirming means, wherein the injection quantity compensation value confirming means evaluates that the injection quantity map or maps compensated by the cylinder difference torque compensation means is or are normal if the exhaust gas temperature detected by the exhaust gas temperature detecting means is within the prescribed area, and wherein the injection quantity compensation value confirming means evaluates that the injection quantity map or maps is or are abnormal if the exhaust gas temperature is beyond the prescribed area.

8. The engine as set forth in claim 1, further comprising:

a supercharging device;

a supercharging device pressure detecting means for detecting the supercharging device pressure of the supercharging device; and

an injection quantity compensation value conforming means, wherein the injection quantity compensation value conforming means evaluates that the injection quantity map compensated by the injection quantity compensation means is normal if the supercharging device pressure detected by the supercharging device pressure detecting means is within the prescribed area, and wherein the injection quantity compensation value confirming means evaluates that the injection quantity map is abnormal if the supercharging device pressure is beyond the prescribed area.

9. The engine as set forth in claim 5, further comprising:

a supercharging device;

a supercharging device pressure detecting means for detecting the supercharging device pressure of the supercharging device; and

an injection quantity compensation value conforming means, wherein the injection quantity compensation value conforming means evaluates that the injection quantity map or maps compensated by the cylinder difference torque compensation means is normal if the supercharging device pressure detected by the supercharging device pressure detecting means is within the prescribed area, and wherein the injection quantity compensation value conforming means evaluates that the injection quantity map or maps is or are abnormal if the supercharging device pressure is beyond the prescribed area.

10. The engine as set forth in claim 1, further comprising:

a supercharging device;

a turbo rotation number detecting means for detecting the rotation number of the turbine of the supercharging device; and

an injection quantity compensation value conforming means, wherein the injection quantity compensation value conforming means evaluates that the injection quantity map compensated by the injection quantity compensation means is normal if the turbo rotation number detected by the turbo rotation number detecting means is within the prescribed area, and wherein the injection quantity compensation value conforming means evaluates that the injection quantity map is abnormal if the supercharging device pressure is beyond the prescribed area.

11. The engine as set forth in claim 5, further comprising:

a supercharging device;

a turbo rotation number detecting means for detecting the rotation number of the turbine of the supercharging device; and

an injection quantity compensation value conforming means, wherein the injection quantity compensation value conforming means evaluates that the injection quantity map compensated by the injection quantity compensation means or by the cylinder difference torque compensation means is normal if the turbo rotation number detected by the turbo rotation number detecting means is within the prescribed area, and wherein the injection quantity compensation value conforming means evaluates that the injection quantity map is abnormal if the supercharging device pressure is beyond the prescribed area.

12. The engine as set forth in claim 1, further comprising:

a warning means, wherein the warning means issues a warning to an operator if the injection quantity map or maps is or are compensated by the injection quantity compensation means.

13. The engine as set forth in claim 5, further comprising:

a warning means, wherein the warning means issues a warning to an operator if the injection quantity map or maps is or are compensated by the injection quantity compensation means.

14. The engine as set forth in claim 6, further comprising:

a warning means, wherein the warning means issues a warning to an operator if the injection quantity compensation value conforming means evaluates that the injection quantity map is abnormal.

15. The engine as set forth in claim 7, further comprising:

a warning means, wherein the warning means issues a warning to an operator if the injection quantity compensation value conforming means evaluates that the injection quantity map is abnormal.

16. The engine as set forth in claim 1, further comprising:

a compensation canceling means manipulated by an operator so as to cancel the injection quantity compensation means.

17. The engine as set forth in claim 5, further comprising:

a compensation canceling means manipulated by an operator so as to cancel the compensation of the injection quantity map by the cylinder difference torque compensation means.

18. The engine as set forth in claims 8, further comprising:

a warning means, wherein the warning means issues a warning to an operator if the injection quantity compensation value conforming means evaluates that the injection quantity map is abnormal.

19. The engine as set forth in claims 9, further comprising:

a warning means, wherein the warning means issues a warning to an operator if the injection quantity compensation value conforming means evaluates that the injection quantity map is abnormal.

20. The engine as set forth in claims 10, further comprising:

a warning means, wherein the warning means issues a warning to an operator if the injection quantity compensation value conforming means evaluates that the injection quantity map is abnormal.

21. The engine as set forth in claims 11, further comprising:

a warning means, wherein the warning means issues a warning to an operator if the injection quantity compensation value conforming means evaluates that the injection quantity map is abnormal.