A gas engine pre-combustion chamber electronic injection control system and control method

Abstract

The present invention discloses a gas engine pre-combustion chamber electronic fuel injection control system and a control method, belonging to the field of gas engine control technology, comprising a cylinder head fixed to the engine, a gas intake passage connected to the pre-combustion chamber is arranged in the cylinder head, the gas intake passage is connected to the pre-combustion gas pipeline, and the pre-combustion gas pipeline is provided with an electronically controlled pressure regulating valve and an electronic fuel injection valve; an in-cylinder combustion pressure sensor is also arranged in the cylinder head, the electronically controlled pressure regulating valve, the electronic fuel injection valve and the in-cylinder combustion pressure sensor are all connected to the electronic control system, and the electronic control system corrects the opening angle and duration of the electronic fuel injection valve in real time according to the in-cylinder combustion pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of gas engine control, and in particular to a gas engine pre-combustion chamber electronic injection control system and a control method. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Natural gas is a green energy source. Gas engines fueled by natural gas can meet the current requirements of low-carbon environmental protection, energy conservation and emission reduction. A notable feature of natural gas engines is slow combustion speed, high exhaust temperature, and easy detonation, which limits the improvement of engine power and thermal efficiency.

[0004] The inventors have discovered that in order to solve the above-mentioned problems, most gas engines currently use a pre-combustion chamber spark plug or a cylinder head structure with a pre-combustion chamber to improve the performance of the engine. The air intake of the pre-combustion chamber is usually controlled by a mechanical one-way valve. This mechanical method of controlling the air intake of the pre-combustion chamber using a pressure difference cannot effectively control the intake time and air volume of the pre-combustion chamber of each cylinder. The uniformity of each cylinder is poor, and a large amount of development tests are required when selecting a one-way valve with a suitable opening pressure, which results in a large amount of work. Summary of the invention

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a gas engine pre-combustion chamber electronic fuel injection control system and control method, which realizes accurate control of the intake time and intake amount of the pre-combustion chamber of each cylinder through real-time monitoring of various sensors and coordinated control of the electronic control system, and can perform online adjustment on a single cylinder to ensure the uniformity of each cylinder, effectively increase the combustion speed, reduce the frequency of knock, and improve the performance of the gas engine as a whole, and solves the problem that the existing pre-combustion chamber intake control method cannot effectively control the intake time and intake amount of the pre-combustion chamber of each cylinder, resulting in poor uniformity of each cylinder.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In the first aspect, the present invention proposes a gas engine pre-combustion chamber electronic fuel injection control system, comprising a cylinder head fixed to the engine, a gas intake passage arranged in the cylinder head and connected to the pre-combustion chamber, the gas intake passage is connected to the pre-combustion gas pipeline, and the pre-combustion gas pipeline is provided with an electronically controlled pressure regulating valve and an electronic fuel injection valve; an in-cylinder combustion pressure sensor is also arranged in the cylinder head, the electronically controlled pressure regulating valve, the electronic fuel injection valve and the in-cylinder combustion pressure sensor are all connected to the electronic control system, and the electronic control system corrects the opening angle and duration of the electronic fuel injection valve in real time according to the in-cylinder combustion pressure.

[0008] As a further technical solution, the pre-combustion gas pipeline is further provided with a gas pressure sensor, which is connected to an electronic control system, and the electronic control system controls the opening of the electronically controlled pressure regulating valve according to the pressure of the pre-combustion gas.

[0009] As a further technical solution, the EFI valve is fixed to the EFI valve mounting seat, an O-shaped groove is provided on the outer wall of the cylinder head, an O-shaped ring is installed in the O-shaped groove, and the O-ring is located between the EFI valve mounting seat and the cylinder head.

[0010] As a further technical solution, a one-way valve is provided at the connection point between the gas intake passage and the pre-combustion chamber, a combustion chamber is also provided in the cylinder head, and the combustion chamber and the pre-combustion chamber are connected; and an in-cylinder combustion pressure sensor is provided in the combustion chamber.

[0011] As a further technical solution, the cylinder head is connected to the exhaust pipe, the exhaust pipe is provided with a single-cylinder exhaust temperature sensor, the single-cylinder exhaust temperature sensor is connected to the electronic control system, and the electronic control system makes real-time corrections to the control parameters of the electronic fuel injection valve according to the exhaust temperature of the single cylinder.

[0012] As a further technical solution, the cylinder head is also connected to an air intake pipeline, a boost air pressure sensor is provided in the air intake pipeline, the boost air pressure sensor is connected to an electronic control system, and a supercharger and an intercooler are also provided in the air intake pipeline.

[0013] As a further technical solution, the electronic control system is also connected to a power detection device, and the power detection device is used to detect the power of the engine.

[0014] As a further technical solution, a speed sensor is installed at the output end of the engine, and the speed sensor is connected to the electronic control system to measure the speed and phase of the engine.

[0015] In a second aspect, the present invention provides a control method for a gas engine pre-combustion chamber electronic fuel injection control system as described above, comprising the following steps:

[0016] The electronic control system outputs an electrical signal to the EFI valve according to the preset opening angle and duration of the EFI valve, controls the opening and closing of the EFI valve, and thus controls the intake time and intake volume of the pre-combustion chamber gas.

[0017] At the same time, the control parameters of the electronic fuel injection valve are corrected online in real time using the single cylinder exhaust temperature value and / or the in-cylinder combustion pressure value.

[0018] As a further technical solution, the electronic control system outputs an electrical signal to the electronically controlled pressure regulating valve according to a preset pressure value of the pre-combustion gas, and controls the pressure value of the pre-combustion gas through the electronically controlled pressure regulating valve.

[0019] The beneficial effects of the present invention are as follows:

[0020] (1) The present invention adopts an electronic fuel injection valve to control the intake time and amount of the pre-combustion fuel gas, and under the action of the electronic control system, combines the single-cylinder exhaust temperature signal and / or the in-cylinder combustion pressure signal to perform real-time online correction on the control parameters of the electronic fuel injection valve, thereby ensuring the intake time and intake amount of each cylinder while ensuring the uniformity of each cylinder, speeding up the combustion speed while reducing the frequency of knocking, and effectively improving the performance of the engine.

[0021] (2) The present invention adopts an electronically controlled pressure regulating valve to control the pre-combustion gas pressure, and adopts a pre-combustion pipeline gas pressure sensor on the rear side of the electronically controlled gas pressure regulating valve to measure the gas pressure, thereby realizing closed-loop control of the pre-combustion gas pressure. The pre-combustion gas pressure in the pre-combustion gas pipeline can be monitored in real time, thereby ensuring the timeliness of the pre-combustion gas pressure adjustment.

[0022] (3) The present invention integrates the calculation and control functions into the electronic control system of the engine, and regulates the system components by real-time monitoring of various system parameters. Compared with mechanical control, it has fast response speed, high control accuracy and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0024] Figure 1 It is a schematic diagram of the overall structure of a gas engine pre-combustion chamber electronic fuel injection control system according to one or more embodiments of the present invention;

[0025] Figure 2 It is a schematic diagram of the control principle of a gas engine pre-combustion chamber electronic fuel injection control system according to one or more embodiments of the present invention;

[0026] In the figure: the distances or sizes between parts are exaggerated to show the positions of the parts, and the schematic diagram is for illustration only;

[0027] Among them, 1. Power detection equipment, 2. Electronic control system, 3. Air, 4. Supercharger, 5. Boost air pressure sensor, 6. Pre-combustion gas, 7. Electronically controlled pressure regulating valve, 8. Electronic fuel injection valve, 9. Electronic fuel injection valve mounting seat, 10. O-ring, 11. Check valve, 12. Pre-combustion chamber components, 13. Cylinder head, 14. Engine, 15. Speed ​​sensor, 16. Pre-combustion pipeline gas pressure sensor, 17. Single-cylinder exhaust temperature sensor, 18. In-cylinder combustion pressure sensor, 19. Pre-combustion chamber gas intake channel, 20. Pre-combustion gas pipeline, 21. Air intake pipeline, 22. Exhaust pipeline. DETAILED DESCRIPTION

[0028] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0029] As introduced in the background technology, the existing pre-combustion chamber intake control method cannot effectively control the intake time and intake volume of the pre-combustion chamber of each cylinder, and the uniformity of each cylinder is poor. In order to solve the above technical problems, the present invention proposes a gas engine pre-combustion chamber electronic injection control system and control method.

[0030] Example 1

[0031] In a typical embodiment of the present invention, Figure 1-Figure 2 As shown, a gas engine pre-combustion chamber electronic fuel injection control system is proposed, including a cylinder head 13, a pre-combustion chamber component 12, a one-way valve 11, an electronic fuel injection valve mounting seat 9, an O-ring 10, an electronic fuel injection valve 8, an electronically controlled pressure regulating valve 7, a speed sensor 15, a pre-combustion pipeline gas pressure sensor 16, a boost air pressure sensor 5, a power detection device 1, a single-cylinder exhaust temperature sensor 17, an in-cylinder combustion pressure sensor 18, and an electronic control system 2.

[0032] Among them, the cylinder head 13 is installed on the engine 14, and the cylinder head 13 is provided with a pre-combustion chamber gas intake channel 19 and an installation position of the pre-combustion chamber component 12, and is also provided with an installation position of a single-cylinder exhaust temperature sensor 17 and an in-cylinder combustion pressure sensor 18.

[0033] The pre-combustion chamber component 12 is installed at a reserved installation position in the cylinder head 13, and includes a pre-combustion chamber cavity, a one-way valve mounting hole and a spark plug mounting hole, wherein the one-way valve mounting hole and the spark plug mounting hole are both located in the pre-combustion chamber cavity, the one-way valve 11 is installed in the one-way valve mounting hole, mainly used to ensure one-way air intake of the pre-combustion fuel gas, and the spark plug is installed in the spark plug mounting hole.

[0034] One end of the precombustion chamber gas intake channel 19 is connected to the precombustion chamber cavity in the precombustion chamber component 12, and the other end is connected to the precombustion gas pipeline 20. In order to ensure the one-way intake of the precombustion gas, a one-way valve 11 is arranged at the connection between the precombustion chamber gas intake channel and the precombustion chamber cavity. A combustion chamber is also arranged in the cylinder head. The combustion chamber and the precombustion chamber cavity are connected, and the spark plug is connected to the precombustion chamber. The spark plug ignites the mixture in the precombustion chamber, diffuses it to the combustion chamber through the nozzle on the precombustion chamber, and then ignites the entire combustion chamber.

[0035] The pre-combustion gas pipeline 20 is provided with an electronically controlled pressure regulating valve 7, a pre-combustion pipeline gas pressure sensor 16 and an electric injection valve 8 in sequence. The electronically controlled pressure regulating valve 7 is located before the electric injection valve 8, that is, the electronically controlled pressure regulating valve 7 is closer to the air intake end of the pre-combustion gas pipeline than the electric injection valve 8, and the pre-combustion pipeline gas pressure sensor 16 is located between the electronically controlled pressure regulating valve 7 and the electric injection valve 8. The pre-combustion gas 6 enters the pre-combustion chamber gas intake passage 19 from the pre-combustion gas pipeline 20.

[0036] Among them, an EFI valve mounting seat 9 is provided at the connection point between the pre-combustion gas pipeline 20 and the pre-combustion chamber gas intake channel 19 in the cylinder head 13. The EFI valve mounting seat 9 is installed on the outer wall of the cylinder head and is mainly used for installing the EFI valve 8. The EFI valve 8 is connected to the electronic control system 2 and is used to receive the signal of the electronic control system 2 to realize the on and off of the pre-combustion gas 6, thereby ensuring the automatic control of the intake time and intake amount of the pre-combustion chamber gas.

[0037] In order to ensure the sealing between the EFI valve 8 and the cylinder head 13, an O-shaped groove is provided on the outer wall of the cylinder head 13, and an O-ring 10 is installed in the O-shaped groove. The O-ring 10 is located between the EFI valve mounting seat 9 and the cylinder head 13, which effectively prevents the leakage of the pre-combustion fuel gas 6.

[0038] The electronically controlled pressure regulating valve 7 is installed on the pre-combustion gas pipeline and is located before the electronic injection valve 8. The electronically controlled pressure regulating valve 7 is also connected to the electronic control system 2 and can adjust the pressure of the pre-combustion gas 6 in the pre-combustion gas pipeline according to the control signal of the electronic control system 2.

[0039] The pre-combustion pipeline gas pressure sensor 16 is connected to the electronic control system 2 and is mainly used to monitor the pressure of the pre-combustion gas 6 in the pre-combustion gas pipeline.

[0040] The pre-combustion pipeline gas pressure sensor 16 can also send pressure information in the form of a signal to the electronic control system 2, so that the electronic control system 2 can judge and send a control signal to the electronically controlled pressure regulating valve 7 based on the pressure information of the pre-combustion gas 6 in the pre-combustion gas pipeline, so as to realize closed-loop control of the pre-combustion pressure of the pre-combustion gas 6 in the pre-combustion gas pipeline.

[0041] The cylinder head 13 is also connected to the air intake pipeline 21, on which a boost air pressure sensor 5, a supercharger 4 and an intercooler are provided, wherein the boost air pressure sensor 5 is located behind the supercharger 4 and the intercooler, that is, the boost air pressure sensor 5 is located at one end of the air intake pipeline connected to the cylinder head 13.

[0042] The boost air pressure sensor 5 is also connected to the electronic control system 2 , and is mainly used to measure the pressure of the boost air and transmit the pressure information of the boost air to the electronic control system 2 .

[0043] During the actual working process, the air 3 enters the air intake pipeline, and the pressure of the air 3 is increased under the action of the supercharger 4, and the temperature of the supercharged air 3 is reduced by the intercooler. Then, the pressure of the supercharged air is measured by the supercharged air pressure sensor 5, and the pressure information is transmitted to the electronic control system 2. The air 3 that meets the pressure requirements enters the combustion chamber of the cylinder head 13 through the air intake pipeline.

[0044] An in-cylinder combustion pressure sensor 18 is also provided in the cylinder head 13. The in-cylinder combustion pressure sensor 18 is fixedly arranged on the cylinder head 13. At the same time, the probe of the in-cylinder combustion pressure sensor 18 extends into the combustion chamber, and is mainly used to measure the combustion pressure in the combustion chamber.

[0045] The in-cylinder combustion pressure sensor 18 is also connected to the electronic control system 2. In actual use, the monitored combustion pressure value in the combustion chamber can be transmitted to the electronic control system 2 for real-time correction of the control parameters of the electronic fuel injection valve 8.

[0046] A single-cylinder exhaust temperature sensor 17 is provided on the exhaust pipe 22 of the cylinder head 13. The single-cylinder exhaust temperature sensor 17 is also connected to the electronic control system 2. It is mainly used to measure the exhaust temperature of a single cylinder and send a signal to the electronic control system 2 for real-time correction of the control parameters of the electronic fuel injection valve 8.

[0047] A speed sensor 15 is installed at the output end of the engine 14. The speed sensor 15 is directly opposite to the camshaft gear of the engine 14 and is connected to the electronic control system 2. The speed sensor 15 is mainly used to measure the speed and phase of the engine.

[0048] The electronic control system 2 is also connected to the power detection device 1, and the power detection device 1 is mainly used to detect the power of the engine.

[0049] After receiving the signals from the boost air pressure sensor 5, the pre-combustion line gas pressure sensor 16, the in-cylinder combustion pressure sensor 18, the speed sensor 15, the single-cylinder exhaust temperature sensor 17 and the power detection device 1, the electronic control system 2 calculates the required pre-combustion gas pressure value in combination with the engine speed and power through a preset program inside the electronic control system 2, and outputs an electrical signal to the electronically controlled pressure regulating valve 7 to control the pre-combustion gas pressure value; calculates the opening angle and duration of the electronic fuel injection valve 8 through a preset program inside the electronic control system 2, and outputs an electrical signal to the electronic fuel injection valve 8 to control the opening and closing of the electronic fuel injection valve 8; and uses the single-cylinder exhaust temperature signal or the in-cylinder combustion pressure signal to perform real-time online correction on the control parameters of the electronic fuel injection valve 8 to ensure the uniformity of the work done by each cylinder.

[0050] Through real-time monitoring of various sensors and coordinated control of the electronic control system 2, precise control of the intake time and intake volume of each cylinder pre-combustion chamber is achieved, and online adjustment can be performed on a single cylinder to ensure the uniformity of each cylinder, effectively increase the combustion speed, reduce the frequency of knocking, and improve the performance of the gas engine as a whole.

[0051] Example 2

[0052] In another typical embodiment of the present application, a control method for a gas engine pre-combustion chamber electronic fuel injection control system as in Embodiment 1 is provided, which is specifically as follows:

[0053] The boost air pressure sensor 5, the pre-combustion line gas pressure sensor 16, the cylinder combustion pressure sensor 18, the speed sensor 15, the single-cylinder exhaust temperature sensor 17 and the power detection device 1 are used to monitor the boost air pressure, the pre-combustion gas 6 pressure, the combustion pressure in the combustion chamber (which can also be understood as the explosion pressure in the combustion chamber), the engine speed, the single-cylinder exhaust temperature and the engine power respectively, and transmit the monitoring data to the electronic control system 2.

[0054] After receiving the signals from the boost air pressure sensor 5, the pre-combustion pipeline gas pressure sensor 16, the in-cylinder combustion pressure sensor 18, the speed sensor 15, the single-cylinder exhaust temperature sensor 17 and the power detection device 1, the electronic control system 2 calculates the required pressure value of the pre-combustion gas 6 in combination with the engine speed and power through a preset program inside the electronic control system 2, outputs an electrical signal to the electronically controlled pressure regulating valve 7, and controls the pressure value of the pre-combustion gas 6 through the electronically controlled pressure regulating valve 7, so that the pressure of the pre-combustion gas 6 meets the requirements;

[0055] The opening angle and duration of the electronic injection valve 8 are calculated by a preset program in the electronic control system 2, and an electrical signal is output to the electronic injection valve 8 to control the opening and closing of the electronic injection valve 8, thereby controlling the intake time and intake amount of the pre-combustion chamber gas according to the calculated values;

[0056] At the same time, the control parameters of the electronic fuel injection valve 8 are corrected in real time online using the single cylinder exhaust temperature signal and / or the in-cylinder combustion pressure signal to ensure the uniformity of the work done by each cylinder, thereby speeding up the combustion speed and reducing the frequency of knock, effectively improving the performance of the engine.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A gas engine pre-combustion chamber electronic fuel injection control system, characterized in that: It comprises a cylinder head fixed to the engine, wherein a gas intake passage is arranged in the cylinder head and communicated with the pre-combustion chamber, the gas intake passage is communicated with the pre-combustion gas pipeline, and the pre-combustion gas pipeline is provided with an electronically controlled pressure regulating valve and an electronic injection valve; an in-cylinder combustion pressure sensor is also arranged in the cylinder head, the electronically controlled pressure regulating valve, the electronic injection valve and the in-cylinder combustion pressure sensor are all connected with an electronic control system, and the electronic control system corrects the opening angle and duration of the electronic injection valve in real time according to the in-cylinder combustion pressure; The electronic control system receives signals from a boost air pressure sensor, a pre-combustion line gas pressure sensor, an in-cylinder combustion pressure sensor, a speed sensor, a single-cylinder exhaust temperature sensor, and a power detection device, and controls the pre-combustion gas pressure value and the opening and closing of the electronic fuel injection valve in combination with the engine speed and power, and uses a single-cylinder exhaust temperature signal or an in-cylinder combustion pressure signal to perform real-time online correction on the control parameters of the electronic fuel injection valve to ensure the uniformity of work performed by each cylinder; The pre-combustion gas pipeline is also provided with a gas pressure sensor, and the gas pressure sensor is connected to the electronic control system; a one-way valve is provided at the connection between the gas intake passage and the pre-combustion chamber, and a combustion chamber is also provided in the cylinder head, and the combustion chamber and the pre-combustion chamber are connected; the in-cylinder combustion pressure sensor is provided in the combustion chamber; the cylinder head is connected to the exhaust pipeline, and the exhaust pipeline is provided with a single-cylinder exhaust temperature sensor, and the single-cylinder exhaust temperature sensor is connected to the electronic control system; the cylinder head is also connected to the air intake pipeline, and the air intake pipeline is provided with a boost air pressure sensor, and the boost air pressure sensor is connected to the electronic control system, and a speed sensor is installed at the output end of the engine, and the speed sensor is connected to the electronic control system to measure the speed and phase of the engine.

2. The gas engine pre-combustion chamber electronic fuel injection control system according to claim 1, characterized in that: The electronic control system controls the opening of the electronically controlled pressure regulating valve according to the pressure of the pre-combustion fuel gas.

3. The gas engine pre-combustion chamber electronic fuel injection control system according to claim 1, characterized in that: The EFI valve is fixed to the EFI valve mounting seat, an O-shaped groove is arranged on the outer wall of the cylinder head, an O-shaped ring is installed in the O-shaped groove, and the O-shaped ring is located between the EFI valve mounting seat and the cylinder head.

4. The gas engine pre-combustion chamber electronic fuel injection control system according to claim 1, characterized in that: The electronic control system corrects the control parameters of the electronic injection valve in real time according to the exhaust temperature of the single cylinder.

5. The gas engine pre-combustion chamber electronic fuel injection control system according to claim 1, characterized in that: The air intake pipeline is also provided with a supercharger and an intercooler.

6. The gas engine pre-combustion chamber electronic fuel injection control system according to claim 1, characterized in that: The electronic control system is also connected to a power detection device, and the power detection device is used to detect the power of the engine.

7. The control method of the gas engine pre-combustion chamber electronic fuel injection control system according to any one of claims 1 to 6, characterized in that: The following steps are involved: The electronic control system outputs an electrical signal to the EFI valve according to the preset opening angle and duration of the EFI valve, controls the opening and closing of the EFI valve, and thus controls the intake time and intake volume of the pre-combustion chamber gas. At the same time, the control parameters of the electronic fuel injection valve are corrected online in real time using the single cylinder exhaust temperature value and / or the in-cylinder combustion pressure value.

8. The control method according to claim 7, characterized in that: The electronic control system outputs an electrical signal to the electronically controlled pressure regulating valve according to the preset pressure value of the pre-combustion gas, and controls the pressure value of the pre-combustion gas through the electronically controlled pressure regulating valve.

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