ENGINE

• US 20110023828A1
• Filed: 03/02/2009
• Published: 02/03/2011
• Est. Priority Date: 03/13/2008
• Status: Active Grant

• Current Assignee: Yanmar Power Technology Co., Ltd. (Yanmar Holdings Co., Ltd.)
• Original Assignee: Yanmar Company Limited (Yanmar Holdings Co., Ltd.)
• Inventors: Kawabe, Takao, Miyamoto, Takashi, Yamada, Kazuhiro, Sakaki, Tetsuo, Kawashima, Isamu
• Granted Patent: US 8,423,266 B2
• Time in Patent Office: Days
• US Class Current: 123/445
• CPC Class Codes: F02B 37/12 Control of the pumps
• CPC Class Codes: F02D 23/02 the engines being of fuel-injection type
• CPC Class Codes: F02D 41/0007 for control of turbo-charged or super-charged engines control of the pumps per se F02B37/12
• CPC Class Codes: F02D 41/2467 for injectors
• CPC Class Codes: F02D 41/40 with means for controlling injection timing or duration
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

An engine in which a fluctuation in the amount of fuel injection is reduced in the entire operating tolerance of the engine. The engine (1) has an engine body (5) provided with a turbocharger (7), an engine speed sensor (21), a turbo sensor (22), a boost sensor (23), and an ECU (20) for correcting the amount of fuel injection. A control means recognizes an engine speed, a supercharging pressure, a supercharger speed, a fuel injection amount and corrects the fuel injection amount.

Claims

1. An engine comprising:

an engine body having a supercharger;

an engine speed detection means which detects an engine speed;

a supercharger speed detection means which detects a supercharger speed;

a supercharging pressure detection means which detects a supercharging pressure; and

a control means which corrects a fuel injection amount,

wherein the control means recognizes the engine speed, the supercharging pressure, the supercharger speed and the fuel injection amount and corrects the fuel injection amount.

2. The engine according to claim 1,

wherein the control means calculates an appropriate supercharger speed and an appropriate supercharger speed tolerance based on the engine speed, the supercharging pressure and the fuel injection amount, and

wherein, when the supercharger speed is not within the appropriate supercharger speed tolerance, the control means corrects the fuel injection amount so as to make the supercharger speed be within the appropriate supercharger speed tolerance.

3. The engine according to claim 2, wherein, when the supercharger speed is within the appropriate supercharger speed tolerance, the control means defines the fuel injection amount at the time of detection of the supercharger speed as a modified fuel injection amount corresponding to the appropriate supercharger speed.

4. The engine according to claim 1,

wherein the control means calculates an appropriate supercharging pressure and an appropriate supercharging pressure tolerance based on the engine speed, the supercharger speed and the fuel injection amount, and

wherein, when the supercharging pressure is not within the appropriate supercharging pressure tolerance, the control means corrects the fuel injection amount so as to make the supercharging pressure be within the appropriate supercharging pressure tolerance.

5. The engine according to claim 4, wherein, when the supercharging pressure is within the appropriate supercharging pressure tolerance, the control means defines the supercharging pressure as a modified valued of the appropriate supercharging pressure.

6. The engine according to claim 1,

wherein the control means calculates an appropriate engine speed and an appropriate engine speed tolerance based on the supercharging pressure, the supercharger speed and the fuel injection amount, and

wherein, when the engine speed is not within the appropriate engine speed tolerance, the control means corrects the fuel injection amount so as to make the engine speed be within the appropriate engine speed tolerance.

7. The engine according to claim 6, wherein, when the engine speed is within the appropriate engine speed tolerance, the control means defines the engine speed as a modified value of the appropriate engine speed.

8. The engine according to claim 2,

wherein the control means calculates an appropriate fuel injection amount correction tolerance based on the fuel injection amount, and

wherein, when the corrected fuel injection amount is not within the appropriate fuel injection amount correction tolerance, the control means defines the corrected fuel injection amount as the maximum or minimum of the appropriate fuel injection amount correction tolerance.

9. The engine according to claim 8, wherein the control means defines an upper limit of the supercharger speed determined in correspondence to every engine speed as a supercharger speed upper limit, and wherein, when the supercharger speed becomes larger than the supercharger speed upper limit, the control means stops increase of the fuel injection amount.

10. The engine according to claim 9, wherein, when the supercharger speed repeats exceeding the supercharger speed upper limit beyond a predetermined count, the control means judges that fuel injection is abnormal.

11. The engine according to claim 1, wherein the control means calculates an engine speed change rate based on the engine speed, calculates a supercharging pressure change rate based on the supercharging pressure, calculates a supercharger speed change rate based on the supercharger speed, calculates a fuel injection amount change rate, and recognizes the engine speed change rate, the supercharging pressure change rate, the supercharger speed change rate and the fuel injection amount change rate and corrects the fuel injection amount.

12. The engine according to claim 11,

wherein the control means calculates an appropriate supercharger speed change rate and an appropriate supercharger speed change rate tolerance based on the engine speed change rate, the supercharging pressure change rate and the fuel injection amount change rate, and

wherein, when the supercharger speed change rate is not within the appropriate supercharger speed change rate tolerance, the control means corrects the fuel injection amount so as to make the supercharger speed change rate be within the appropriate supercharger speed change rate tolerance.

13. The engine according to claim 12, wherein, when the supercharger speed change rate is within the appropriate supercharger speed change rate tolerance, the control means defines the supercharger speed change rate as a modified value of the appropriate supercharger speed change rate.

14. The engine according to claim 11,

wherein the control means calculates an appropriate supercharging pressure change rate and an appropriate supercharging pressure change rate tolerance based on the engine speed change rate, the supercharger speed change rate and the fuel injection amount change rate, and

wherein, when the supercharging pressure change rate is not within the appropriate supercharging pressure change rate tolerance, the control means corrects the fuel injection amount so as to make the supercharging pressure change rate be within the appropriate supercharging pressure change rate tolerance.

15. The engine according to claim 14, wherein, when the supercharging pressure change rate is within the appropriate supercharging pressure change rate tolerance, the control means defines the supercharging pressure change rate as a modified value of the appropriate supercharging pressure change rate.

16. The engine according to claim 11,

wherein the control means calculates an appropriate engine speed change rate and an appropriate engine speed change rate tolerance based on the supercharger speed change rate, the supercharging pressure change rate and the fuel injection amount change rate, and

wherein, when the engine speed change rate is not within the appropriate engine speed change rate tolerance, the control means corrects the fuel injection amount so as to make the engine speed change rate be within the appropriate engine speed change rate tolerance.

17. The engine according to claim 16, wherein, when the engine speed change rate is within the appropriate engine speed change rate tolerance, the control means defines the engine speed change rate as a modified value of the appropriate engine speed change rate.

18. The engine according to claim 4,

wherein the control means calculates an appropriate fuel injection amount correction tolerance based on the fuel injection amount, and

wherein, when the corrected fuel injection amount is not within the appropriate fuel injection amount correction tolerance, the control means defines the corrected fuel injection amount as the maximum or minimum of the appropriate fuel injection amount correction tolerance.

19. The engine according to claim 6,

wherein the control means calculates an appropriate fuel injection amount correction tolerance based on the fuel injection amount, and

wherein, when the corrected fuel injection amount is not within the appropriate fuel injection amount correction tolerance, the control means defines the corrected fuel injection amount as the maximum or minimum of the appropriate fuel injection amount correction tolerance.