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CN-116950793-B - Method for injecting fuel into engine, vehicle and computer readable storage medium

CN116950793BCN 116950793 BCN116950793 BCN 116950793BCN-116950793-B

Abstract

The invention provides an oil injection method of an engine, the engine, a vehicle and a computer readable storage medium, and relates to the technical field of vehicle tail gas emission control, wherein the oil injection method comprises the following steps: and before the engine runs to a stable idle speed, fuel injection is carried out in a first air inlet stroke and a first compression stroke of each working cycle at preset fuel pressure, wherein the fuel injection mass ratio of the fuel injection mass of the first air inlet stroke to the fuel injection mass of the first compression stroke is greater than 4:1, and the range of the preset fuel pressure is 20-50MPa. When the rotating speed of the engine is at a stable idle speed, fuel injection is carried out in a second air inlet stroke and a second compression stroke of each working cycle, and fuel injection is carried out at preset fuel pressure, wherein the fuel injection mass ratio of the fuel injection mass of the second air inlet stroke to the fuel injection mass of the second compression stroke is greater than or equal to 4:1, and under the condition of omitting a particle catcher device, the emission level of automobile exhaust is ensured to meet the European emission standard 6 requirement, and the original emission of the engine is optimized.

Inventors

  • ZHANG JUNCHEN
  • SHI CONGGUANG
  • ZHANG QINGMAO

Assignees

  • 浙江吉利控股集团有限公司
  • 吉利汽车研究院（宁波）有限公司

Dates

Publication Date
20260505
Application Date
20230727

Claims (10)

  1. 1. An oil injection method of an engine is characterized by comprising the following steps: Before the engine runs to a stable idle speed, fuel injection is carried out in a first air inlet stroke and a first compression stroke of each working cycle at preset fuel pressure, wherein the fuel injection mass ratio of the fuel injection mass of the first air inlet stroke to the fuel injection mass of the first compression stroke is greater than 4:1, and the range of the preset fuel pressure is 20-50MPa; and when the rotating speed of the engine is positioned at the stable idle speed, injecting oil in a second air inlet stroke and injecting oil in a second compression stroke of each working cycle at the preset fuel pressure, wherein the injection mass ratio of the injection mass of the second air inlet stroke to the injection mass of the second compression stroke is greater than or equal to 4:1.
  2. 2. The fuel injection method according to claim 1, wherein the preset fuel pressure is in the range of 20 to 35MPa.
  3. 3. The fuel injection method according to claim 1, characterized in that a fuel injection mass ratio of a fuel injection mass of the first intake stroke to a fuel injection mass of the first compression stroke is 4.5:1 to 9:1; the ratio of the injection mass of the second intake stroke to the injection mass of the second compression stroke is 4:1 to 9:1.
  4. 4. A fuel injection method according to claim 3, wherein the fuel injection mass ratio of the fuel injection mass of the first intake stroke and the fuel injection mass of the first compression stroke is 5-8:1; the ratio of the injection mass of the second intake stroke to the injection mass of the second compression stroke is 5-8:1.
  5. 5. The fuel injection method according to any one of claims 1 to 4, characterized in that said fuel injection is performed at a preset fuel pressure on a first intake stroke and a first compression stroke of each working cycle, specifically comprising: injecting fuel in the latter half of the first intake stroke injection and/or injecting fuel in the former half of the first compression stroke injection; The second-half oil injection is a process that the piston of the engine moves downwards from the top dead center, and the first-half oil injection is a process that the piston of the engine moves upwards from the bottom dead center.
  6. 6. The method of injecting fuel as defined in any one of claims 1-4, wherein the timing of injection of the second intake stroke fuel is within a first time frame after piston movement to compression top dead center of the engine, wherein the first time frame is from a time when a crankshaft rotatably coupled to the piston rotates 180 degrees relative to piston movement to compression top dead center to a time when the piston moves 270 degrees relative to piston movement to compression top dead center.
  7. 7. The fuel injection method according to any one of claims 1 to 4, wherein the fuel injection timing of the fuel injection of the second compression stroke is within a second time range after the piston of the engine moves to compression top dead center, wherein the second time range is from a time when a crankshaft rotatably connected to the piston rotates 90 degrees relative to the piston moves to compression top dead center to a time when the piston moves 180 degrees relative to compression top dead center.
  8. 8. An engine comprising a cylinder and a fuel injection assembly configured to perform the method of injecting fuel into the cylinder of the engine of any one of claims 1-7.
  9. 9. A vehicle comprising the engine of claim 8.
  10. 10. A computer readable storage medium storing computer instructions for causing a processor to perform the method of fueling the engine of any one of claims 1-7.

Description

Method for injecting fuel into engine, vehicle and computer readable storage medium Technical Field The present invention relates to the field of vehicle exhaust emission control technologies, and in particular, to an engine fuel injection method, an engine, a vehicle, and a computer readable storage medium. Background With the development of automobile applications, the emission standards of automobile exhaust are continuously updated, and the european emission standard 6 (Euro 6, abbreviated as Euro 6) is widely implemented and popularized as the latest standard, wherein the european emission standard 6 comprises a certain specification requirement, namely a PN original row requirement, on the Number of particles (Particle Number, abbreviated as PN) generated during the running process of an engine, and automobile manufacturers aim to improve and optimize an automobile engine oil injection method, namely design or improve the mode and timing of injecting fuel in an automobile internal combustion engine so as to regulate the engine performance and emission level to meet the requirement of the european emission standard 6. In the related art, a particulate trap (GPF) is generally used in an after-treatment technology of an engine to control an exhaust emission level, wherein the after-treatment technology refers to a process of further treating an exhaust after the engine emits the exhaust, and includes, but is not limited to, a three-way catalyst, a particulate trap, and a selective catalytic Reduction System (SCR), which is also referred to as a urea SCR System. It should be noted that the particulate trap is a device for controlling exhaust particulate matter emission of a gasoline engine, mainly used for capturing and filtering solid particulate matter emitted from the engine, and is exemplified by a fine-pore ceramic or metal fiber network with high surface area and porosity so as to effectively capture and filter the particulate matter. However, the related art adopts the particle catcher to control the exhaust emission of the engine to meet the European 6 standard, the particle catcher needs to be regularly maintained and serviced, and the use and maintenance cost of the particle catcher are high. Disclosure of Invention The invention provides an oil injection method of an engine, which ensures that the emission level of automobile exhaust meets the European emission standard 6 requirement under the condition of omitting a particle catcher device and an exhaust particle catching treatment process thereof, optimizes the original emission of the engine, and simultaneously saves the control cost of the exhaust emission of the engine. In order to achieve the above object, the present invention provides the following technical solutions: a first aspect of the present invention provides a fuel injection method for an engine, comprising the steps of: And before the engine runs to a stable idle speed, fuel injection is carried out in a first air inlet stroke and a first compression stroke of each working cycle at a preset fuel pressure, wherein the fuel injection mass ratio of the fuel injection mass of the first air inlet stroke to the fuel injection mass of the first compression stroke is greater than 4:1, and the preset fuel pressure is in the range of 20-50MPa. And when the rotating speed of the engine is positioned at the stable idle speed, injecting oil in a second air inlet stroke and injecting oil in a second compression stroke of each working cycle at the preset fuel pressure, wherein the injection mass ratio of the injection mass of the second air inlet stroke to the injection mass of the second compression stroke is greater than or equal to 4:1. In one possible implementation, the preset fuel pressure ranges from 20 to 35MPa. In one possible implementation, the injection mass ratio of the injection mass of the first intake stroke to the injection mass of the first compression stroke is 4.5:1 to 9:1; the ratio of the injection mass of the second intake stroke to the injection mass of the second compression stroke is 4:1 to 9:1. In one possible implementation, the injection mass ratio of the injection mass of the first intake stroke to the injection mass of the first compression stroke is 5-8:1; the ratio of the injection mass of the second intake stroke to the injection mass of the second compression stroke is 5-8:1. In one possible implementation manner, the fuel injection is performed at a preset fuel pressure in the first intake stroke and the first compression stroke of each working cycle, and specifically includes: injecting fuel in the latter half of the first intake stroke injection and/or injecting fuel in the former half of the first compression stroke injection; The second-half oil injection is a process that the piston of the engine moves downwards from the top dead center, and the first-half oil injection is a process that the piston of the engine moves upwards from the bottom dead cent