초록 ▼

A diesel engine capable of favorably preventing the generation of white smoke even when an engine load is shifted from a high load side to a low load side. For this purpose, a diesel engine (1) includes fuel injection timing control means (42) for controlling fuel injection timing, the fuel injectio

A diesel engine capable of favorably preventing the generation of white smoke even when an engine load is shifted from a high load side to a low load side. For this purpose, a diesel engine (1) includes fuel injection timing control means (42) for controlling fuel injection timing, the fuel injection timing control means (42) advances the fuel injection timing by predetermined time when an engine load becomes a predetermined load (Ff) or lower in an engine stopping step of stopping the diesel engine while gradually reducing the engine load.

대표청구항 ▼

1. A diesel engine comprising:a supercharger for pressurizing outside air and supplying the pressurized air as charge air into combustion chambers; a first heat exchanger, provided in a charge air channel extending from an outlet of the supercharger on a compressor side of the supercharger, for rece

1. A diesel engine comprising:a supercharger for pressurizing outside air and supplying the pressurized air as charge air into combustion chambers; a first heat exchanger, provided in a charge air channel extending from an outlet of the supercharger on a compressor side of the supercharger, for receiving a first medium and for exchanging heat with the charge air from the outlet of the supercharger; a second heat exchanger, provided in the charge air channel, for receiving a second medium having a higher temperature than the first medium and for exchanging heat with the charge air from an outlet of the first heat exchanger; and fuel injection timing control means for controlling a fuel injection timing of a fuel; wherein the fuel injection timing control means advances the fuel injection timing for a predetermined period of time when an engine load on the diesel engine is shifted to a low load from a high load and decreases to a predetermined level. 2. The diesel engine according to claim 1, further comprising charge air temperature detecting means for detecting a temperature of the charge air;wherein the fuel injection timing control means controls the fuel injection timing based on a detection signal from the charge air temperature detecting means. 3. The diesel engine according to claim 2, further comprising reduced cylinder operation control means for stopping fuel supply to at least one of the combustion chambers when the engine load decreases to the predetermined level.4. The diesel engine according to claim 3, wherein the fuel comprises a water emulsion fuel.5. The diesel engine according to claim 4, further comprising flow control means for controlling a flow of the second medium to the second heat exchanger;wherein the flow control means (i) at least one of reduces and eliminates the flow of the second medium to the second heat exchanger when the engine load exceeds the predetermined level, and (ii) increases the flow of the second medium to the second heat exchanger when the engine load decreases to the predetermined level; and wherein the fuel injection timing control means advances the fuel injection timing for the predetermined period of time, when the flow of the second medium to the second heat exchanger is increased by the flow control means. 6. The diesel engine according to claim 5, wherein the diesel engine comprises a water cooling diesel engine using cooling water, and the first medium comprises outside air, and the second medium comprises the cooling water.7. The diesel engine according to claim 3, further comprising flow control means for controlling a flow of the second medium to the second heat exchanger;wherein the flow control means (i) at least one of reduces and eliminates the flow of the second medium to the second heat exchanger when the engine load exceeds the predetermined level, and (ii) increases the flow of the second medium to the second heat exchanger when the engine load decreases to the predetermined level; and wherein the fuel injection timing control means advances the fuel injection timing for the predetermined period of time, when the flow of the second medium to the second heat exchanger is increased by the flow control means. 8. The diesel engine according to claim 7, wherein the diesel engine comprises a water cooling diesel engine using cooling water, and the first medium comprises outside air, and the second medium comprises the cooling water.9. The diesel engine according to claim 2, wherein the fuel comprises a water emulsion fuel.10. The diesel engine according to claim 9, further comprising flow control means for controlling a flow of the second medium to the second heat exchanger;wherein the flow control means (i) at least one of reduces and eliminates the flow of the second medium to the second heat exchanger when the engine load exceeds the predetermined level, and (ii) increases the flow of the second medium to the second heat exchanger when the engine load decreases to the predetermined level; and wherein the fuel injection timing control means advances the fuel injection timing for the predetermined period of time, when the flow of the second medium to the second heat exchanger is increased by the flow control means. 11. The diesel engine according to claim 10, wherein the diesel engine comprises a water cooling diesel engine using cooling water, and the first medium comprises outside air, and the second medium comprises the cooling water.12. The diesel engine according to claim 2, further comprising flow control means for controlling a flow of the second medium to the second heat exchanger;wherein the flow control means (i) at least one of reduces and eliminates the flow of the second medium to the second heat exchanger when the engine load exceeds the predetermined level, and (ii) increases the flow of the second medium to the second heat exchanger when the engine load decreases to the predetermined level; and wherein the fuel injection timing control means advances the fuel injection timing for the predetermined period of time, when the flow of the second medium to the second heat exchanger is increased by the flow control means. 13. The diesel engine according to claim 12, wherein the diesel engine comprises a water cooling diesel engine using cooling water, and the first medium comprises outside air, and the second medium comprises the cooling water.14. The diesel engine according to claim 1, further comprising reduced cylinder operation control means for stopping fuel supply to at least one of the combustion chambers when the engine load decreases to the predetermined level.15. The diesel engine according to claim 14, wherein the fuel comprises a water emulsion fuel.16. The diesel engine according to claim 15, further comprising flow control means for controlling a flow of the second medium to the second heat exchanger;wherein the flow control means (i) at least one of reduces and eliminates the flow of the second medium to the second heat exchanger when the engine load exceeds the predetermined level, and (ii) increases the flow of the second medium to the second heat exchanger when the engine load decreases to the predetermined level; and wherein the fuel injection timing control means advances the fuel injection timing for the predetermined period of time, when the flow of the second medium to the second heat exchanger is increased by the flow control means. 17. The diesel engine according to claim 16, wherein the diesel engine comprises a water cooling diesel engine using cooling water, and the first medium comprises outside air, and the second medium comprises the cooling water.18. The diesel engine according to claim 14, further comprising flow control means for controlling a flow of the second medium to the second heat exchanger;wherein the flow control means (i) at least one of reduces and eliminates the flow of the second medium to the second heat exchanger when the engine load exceeds the predetermined level, and (ii) increases the flow of the second medium to the second heat exchanger when the engine load decreases to the predetermined level; and wherein the fuel injection timing control means advances the fuel injection timing for the predetermined period of time, when the flow of the second medium to the second heat exchanger is increased by the flow control means. 19. The diesel engine according to claim 18, wherein the diesel engine comprises a water cooling diesel engine a using cooling water, and the first medium comprises outside air, and the second medium comprises the cooling water.20. The diesel engine according to claim 1, wherein the fuel comprises a water emulsion fuel.21. The diesel engine according to claim 20, further comprising flow control means for controlling a flow of the second medium to the second heat exchanger;wherein the flow control means (i) at least one of reduces and eliminates the flow of the second medium to the second heat exchanger when the engine load exceeds the predetermined level, and (ii) increases the flow of the second medium to the second heat exchanger when the engine load decreases to the predetermined level; and wherein the fuel injection timing control means advances the fuel injection timing for the predetermined period of time, when the flow of the second medium to the second heat exchanger is increased by the flow control means. 22. The diesel engine according to claim 21, wherein the diesel engine comprises a water cooling diesel engine using cooling water, and the first medium comprises outside air, and the second medium comprises the cooling water.23. The diesel engine according to claim 1, further comprising flow control means for controlling a flow of the second medium to the second heat exchanger;wherein the flow control means (i) at least one of reduces and eliminates the flow of the second medium to the second heat exchanger when the engine load exceeds the predetermined level, and (ii) increases the flow of the second medium to the second heat exchanger when the engine load decreases to the predetermined level; and wherein the fuel injection timing control means advances the fuel injection timing for the predetermined period of time, when the flow of the second medium to the second heat exchanger is increased by the flow control means. 24. The diesel engine according to claim 23, wherein the diesel engine comprises a water cooling diesel engine using cooling water, and the first medium comprises outside air, and the second medium comprises the cooling water.