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CN-118622503-B - Engine system and engine combustion organization method

CN118622503BCN 118622503 BCN118622503 BCN 118622503BCN-118622503-B

Abstract

The invention provides an engine system and an engine combustion organization method, and relates to the technical field of engines. The engine combustion organization method comprises the steps that the first injection piece is arranged close to the axis of the piston piece compared with the second injection piece, the injection starting time of second fuel is earlier than the injection starting time of first fuel, the first injection piece is used for injecting a plurality of first fuel beams, the intersection points of the plurality of first fuel beams and the piston top are used for injecting a plurality of second fuel beams, the intersection points of the plurality of second fuel beams and the piston top are used for limiting a second range, and the second range is located in the first range, so that when the first fuel beams develop to the piston top, the second fuel in the second fuel beams is limited in a space formed between the first fuel beams and the piston top to be combusted. The ignition of the first fuel can be realized through fewer second fuels, so that the substitution rate of 95% is realized, and the emission of nitrogen oxides is reduced.

Inventors

  • JIANG YUQI
  • YAN PING
  • LI XIAO
  • ZHENG LIANG
  • MAN ZHONGGUO

Assignees

  • 中国船舶集团有限公司第七一一研究所

Dates

Publication Date
20260508
Application Date
20240628

Claims (10)

  1. 1. An engine combustion organization method for combustion control of an engine body including a first injection member, a second injection member, a piston member, a cylinder head, and a cylinder, the piston member being movably disposed in the cylinder, a piston crown of the piston member for forming a combustion chamber with the cylinder head, the first injection member and the second injection member being disposed on the cylinder head, and the first injection member for injecting a first fuel into the combustion chamber, the second injection member for injecting a second fuel into the combustion chamber, the second fuel for igniting the first fuel, characterized by comprising: the first spraying piece is arranged close to the axis of the piston piece compared with the second spraying piece; the injection start timing of the second fuel is earlier than the injection start timing of the first fuel; The first injection member is used for injecting a plurality of first fuel beams, the intersection points of the plurality of first fuel beams and the piston top limit a first range, the second injection member is used for injecting a plurality of second fuel beams, the intersection points of the plurality of second fuel beams and the piston top limit a second range, and the second range is positioned in the first range so that when the first fuel beams are developed to the piston top, the second fuel in the second fuel beams is limited in a space formed between the first fuel beams and the piston top to burn.
  2. 2. The engine combustion organization method according to claim 1, wherein, The piston crown of the piston member includes a convex arc portion and annular pockets distributed around the convex arc portion, at least two of the plurality of second fuel bundles being located on opposite sides of the convex arc portion, respectively.
  3. 3. The engine combustion organization method according to claim 1, wherein, The injection end timing of the second fuel is later than the injection start timing of the first fuel.
  4. 4. The engine combustion organization method according to claim 3, wherein, The injection pulse width of the second fuel is smaller than the injection pulse width of the first fuel.
  5. 5. The engine combustion organization method according to claim 1, wherein, The injection start timing of the first fuel is when the flame of the second fuel develops to the center of the combustion chamber.
  6. 6. The engine combustion organization method according to claim 1, wherein, The first fuel is methanol and the second fuel is diesel.
  7. 7. An engine system, characterized in that, The engine system employs the engine combustion organization method of any one of claims 1-6.
  8. 8. The engine system of claim 7, wherein the engine system further comprises a control unit configured to control the engine system, A first injection member in the engine system is disposed at an axis of the piston member, and the second injection member is disposed in spaced relation to the first injection member.
  9. 9. The engine system of claim 8, wherein the engine is configured to operate in a hybrid mode, The axial direction of the second injection member intersects with the axial direction of the piston member.
  10. 10. The engine system of claim 7, wherein the engine system further comprises a control unit configured to control the engine system, The first injection member is provided with a plurality of injection holes which are distributed along the circumferential direction of the first injection member and are used for injecting the first fuel beams, and the number of the injection holes is 10 or 12.

Description

Engine system and engine combustion organization method Technical Field The invention relates to the technical field of engines, in particular to an engine system and an engine combustion organization method. Background With increasing importance on environmental protection, the emission requirements of engines are becoming more stringent, and thus technologies using clean fuels instead of conventional fuels have been greatly developed. For example, a methanol fuel engine is a device that uses methanol instead of diesel to burn and output power. At present, the methanol fuel in the methanol fuel engine mainly has two application modes, namely an air inlet channel injection method and an in-cylinder direct injection method. In-cylinder direct injection adopts two independent fuel injection systems of diesel oil and methanol, wherein the methanol is used as main fuel, and a small amount of diesel oil only has ignition effect. In a methanol fuel engine adopting direct injection in a cylinder, diesel oil is required to be ignited, so that the diesel oil is a mode of burning by replacing part of diesel oil with methanol, the existing burning organization mode is difficult to realize the substitution rate of 95%, and more nitrogen oxides can be generated due to the fact that diesel oil is used as ignition fuel to burn in the cylinder by mechanical energy, and the environment protection is not facilitated. Disclosure of Invention The invention aims to provide an engine combustion organization method which can solve the technical problems that the substitution rate of 95% is difficult to achieve and more nitrogen oxides are generated in the prior art. The present invention also aims to provide an engine system that can solve the technical problems that the prior art is difficult to achieve a 95% substitution rate and that nitrogen oxides are generated more. Embodiments of the present invention may be implemented in the following manner: An engine combustion organization method for combustion control of an engine block including a first injection member, a second injection member, a piston member, a cylinder head, and a cylinder, the piston member being movably disposed in the cylinder, a piston crown of the piston member for forming a combustion chamber with the cylinder head, the first injection member and the second injection member being disposed on the cylinder head, and the first injection member for injecting a first fuel into the combustion chamber, the second injection member for injecting a second fuel into the combustion chamber, the second fuel for igniting the first fuel, the engine combustion organization method comprising: the first spraying piece is arranged close to the axis of the piston piece compared with the second spraying piece; the injection start timing of the second fuel is earlier than the injection start timing of the first fuel; The first injection member is used for injecting a plurality of first fuel beams, the intersection points of the plurality of first fuel beams and the piston top limit a first range, the second injection member is used for injecting a plurality of second fuel beams, the intersection points of the plurality of second fuel beams and the piston top limit a second range, and the second range is positioned in the first range so that when the first fuel beams are developed to the piston top, the second fuel in the second fuel beams is limited in a space formed between the first fuel beams and the piston top to burn. Optionally, the piston crown of the piston member includes a convex arc portion and annular pits distributed around the convex arc portion, and at least two of the plurality of second fuel bundles are respectively located on opposite sides of the convex arc portion. Optionally, the injection end time of the second fuel is later than the injection start time of the first fuel. Optionally, the injection pulse width of the second fuel is smaller than the injection pulse width of the first fuel. Optionally, the injection start timing of the first fuel is when the flame of the second fuel develops to the center of the combustion chamber. Optionally, the first fuel is methanol, and the second fuel is diesel. An engine system employing the engine combustion organization method described above. Optionally, a first injection member in the engine system is disposed at an axis of the piston member, and the second injection member is disposed spaced apart from the first injection member. Optionally, the axial direction of the second injection member intersects the axial direction of the piston member. Optionally, the first injection member has a plurality of injection holes distributed along a circumferential direction of the first injection member, and the injection holes are used for injecting the first fuel beam, and the number of the injection holes is 10 or 12. The engine system and the engine combustion organization method provided by the embodiment of the invent