A combustion control system and method for a hydrogen rotor machine with end-face hydrogen injection

Abstract

The present invention belongs to the field of hydrogen rotor machine combustion control, and provides a hydrogen rotor machine combustion control system and method for end-face hydrogen injection. The system includes a hydrogen injection valve group, which is symmetrically installed at the hydrogen injection holes reserved in the front cylinder head and the rear cylinder head of the hydrogen rotor machine; a controller, which is used to control the opening time of the hydrogen injection valve group according to the rotor machine speed and load conditions, so as to realize hydrogen injection at multiple points of the hydrogen rotor machine cylinder at different times, so as to achieve the purpose of hydrogen stratified combustion.

Description

Technical Field

[0001] The invention belongs to the field of hydrogen rotor machine combustion control, and in particular relates to a hydrogen rotor machine combustion control system and method with end-face hydrogen injection. Background Art

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

[0003] Rotary engines mainly use fossil fuels such as gasoline and diesel, but their high fuel consumption and high emissions due to their narrow combustion chamber and large surface area limit their development and application. Using hydrogen fuel is an effective way to overcome the above problems of rotary engines and improve their performance.

[0004] The inventors have found that most of the current hydrogen rotor engines are duct-injected, and duct-injected hydrogen squeezes out the air intake, resulting in low air charging efficiency, which in turn affects the engine power and efficiency. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a hydrogen rotor machine combustion control system and method with end-face hydrogen injection, which can enable hydrogen to be injected at multiple points in the cylinder of the hydrogen rotor machine at different times to achieve the purpose of stratified combustion of hydrogen.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] The first aspect of the present invention provides a hydrogen rotor machine combustion control system with end-face hydrogen injection, comprising:

[0008] The hydrogen injection valve group is symmetrically installed at the hydrogen injection holes reserved on the front and rear cylinder heads of the hydrogen rotor engine;

[0009] The controller is used to control the opening time of the hydrogen injection valve group according to the rotor machine speed and load conditions, so as to realize the injection of hydrogen at multiple points of the hydrogen rotor machine cylinder at different times, so as to achieve the purpose of hydrogen stratified combustion.

[0010] As an implementation mode, a first set of hydrogen injection valves is installed at the hydrogen injection holes reserved in the front cylinder cover of the hydrogen rotor machine, and a second set of hydrogen injection valves is installed at the hydrogen injection holes reserved in the rear cylinder cover of the hydrogen rotor machine.

[0011] As an implementation manner, the controller is used to control only one group of hydrogen injection valves to open when the rotor machine speed is not greater than a first speed and the load is not greater than a first load.

[0012] As an embodiment, the controller is used to control the first group of hydrogen injection valves and the second group of hydrogen injection valves to open when the rotor speed is greater than the first speed and less than the second speed, and the load is greater than the first load and less than the second load.

[0013] As an embodiment, the controller is used to: when the rotor speed is greater than the second speed and less than the third speed, and the load is greater than the second load and less than the third load, control the opening time of the second group of hydrogen injection valves to be greater than the opening time of the first group of hydrogen injection valves.

[0014] As an implementation mode, the axis of the hydrogen spray hole on the front cylinder cover of the hydrogen rotor engine is 30° to 40° with the end face of the front cylinder cover.

[0015] As an implementation mode, the axis of the hydrogen spray hole on the rear cylinder cover of the hydrogen rotor machine is 30° to 40° with the end face of the rear cylinder cover.

[0016] As an embodiment, the controller is also connected to a hydrogen leak detector and an explosion-proof solenoid valve respectively. The hydrogen leak detector is used to send a hydrogen leak valve signal to the controller when the hydrogen content exceeds a specified value. When the controller receives the hydrogen leak valve feedback signal, it sends an instruction to the explosion-proof solenoid valve to cut off the hydrogen source.

[0017] A second aspect of the present invention provides a combustion control method for a hydrogen rotor machine with end-face hydrogen injection, comprising:

[0018] The opening time of the hydrogen injection valve group is controlled according to the rotor machine speed and load conditions, so that hydrogen can be injected at multiple points in the hydrogen rotor machine cylinder at different times to achieve the purpose of hydrogen stratified combustion; wherein the hydrogen injection valve group includes a first group of hydrogen injection valves and a second group of hydrogen injection valves, which are respectively installed at the hydrogen injection holes reserved on the front cylinder head and the rear cylinder head of the hydrogen rotor machine;

[0019] When the rotor machine speed is not greater than the first speed and the load is not greater than the first load, only one group of hydrogen injection valves is controlled to open;

[0020] When the rotor machine speed is greater than the first speed and less than the second speed, and the load is greater than the first load and less than the second load, the first group of hydrogen injection valves and the second group of hydrogen injection valves are controlled to open;

[0021] When the rotor speed is greater than the second speed and less than the third speed, and the load is greater than the second load and less than the third load, the opening time of the second group of hydrogen injection valves is controlled to be greater than the opening time of the first group of hydrogen injection valves.

[0022] As an implementation mode, the hydrogen rotor engine combustion control method further includes:

[0023] Receive feedback signals from the hydrogen leakage valve and send instructions to the explosion-proof solenoid valve to cut off the hydrogen source.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention controls the opening time of the hydrogen injection valve group according to the rotor machine rotation speed and load conditions, thereby solving the problem that the airway injection of hydrogen in the current hydrogen-channel injection rotor machine squeezes out the air intake volume, resulting in low air charging efficiency and further affecting the engine power and efficiency. The present invention realizes the injection of hydrogen at multiple points in the hydrogen rotor machine cylinder body at different times and uniform mixing of hydrogen with air, thereby achieving the purpose of stratified combustion of hydrogen and obtaining higher thermal efficiency. Moreover, the hydrogen injection valve group is symmetrically installed at the hydrogen spray holes reserved in the front cylinder head and the rear cylinder head of the hydrogen rotor machine, which belongs to the hydrogen compression chamber direct injection technology, thereby improving the charging efficiency and further improving the engine power.

[0026] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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.

[0028] Figure 1 The hydrogen supply system of the hydrogen rotor machine according to the embodiment of the present invention;

[0029] Figure 2 is a schematic diagram of the position of the spray hole in the cylinder head according to an embodiment of the present invention;

[0030] Figure 3 4 is a cross-sectional view of the arrangement of hydrogen injection holes according to an embodiment of the present invention.

[0031] Among them, 1-hydrogen cylinder; 2-explosion-proof solenoid valve; 3-primary pressure reducing valve; 4-fireproof check valve; 5-secondary pressure reducing valve; 6-hydrogen injection rail; 7-pressure sensor; 8-hydrogen leak detector; 9-hydrogen injection valve; 10-hydrogen rotor machine; 11-ECU; 12-intake pipe; 13-exhaust pipe; 14-spark plug; 15-crank position sensor; 16-hydrogen spray hole; 17-rear cylinder head; 18-front cylinder head; 19-rotor; 20-cylinder body; 21-intake port; 22-exhaust port; 23-rotor rotation direction. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] It should be noted that the following detailed descriptions are all illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] Embodiment 1

[0036] In order to solve the problem in the background technology that the hydrogen injection in the hydrogen injection rotor engine currently squeezes the air intake, resulting in low air charging efficiency, which in turn affects the engine power and efficiency, this embodiment provides a hydrogen rotor engine combustion control system with end-face hydrogen injection. The system injects hydrogen in the compression chamber, adopts a multi-point injection strategy, realizes multi-point injection at different times, and finally realizes hydrogen stratified combustion.

[0037] Among them, the compression chamber is a working room enclosed by the rotor, cylinder body, and front and rear cylinder heads. When the rotor rotates, the volume of the working room will change. The process of the working room volume changing from large to small is a compression process, and the structural position area corresponding to this process is called the compression chamber.

[0038] This embodiment provides a hydrogen rotor machine combustion control system with end-face hydrogen injection, which includes a hydrogen injection valve group and a controller.

[0039] In other embodiments, the controller is also connected to a hydrogen leak detector and an explosion-proof solenoid valve, respectively. The hydrogen leak detector is used to send a hydrogen leak valve signal to the controller when the hydrogen content exceeds a specified value. When the controller receives the hydrogen leak valve feedback signal, it sends an instruction to the explosion-proof solenoid valve to cut off the hydrogen source.

[0040] like Figure 1 As shown, hydrogen is reduced in pressure from the hydrogen cylinder 1 through the primary pressure reducing valve 3 and the secondary pressure reducing valve 5 in sequence to reach the hydrogen injection rail 6, and then enters the cylinder through the hydrogen injection valve 9. Among them, an explosion-proof solenoid valve 2 is also connected in series between the hydrogen cylinder 1 and the primary pressure reducing valve 3, and a fire-proof check valve 4 is also connected in series between the primary pressure reducing valve 3 and the secondary pressure reducing valve 5. A pressure sensor 7 is also provided on the hydrogen injection rail 6, which is used to detect the pressure on the hydrogen injection rail 6 and transmit it to the controller (such as: ECU11). ECU11 is also connected to the hydrogen leak detector 8, the hydrogen injection valve 9, the spark plug 14 and the crank sensor 15 respectively.

[0041] The hydrogen injection valve is controlled by a controller (such as ECU, Electronic Control Unit) according to parameters such as engine speed and power. The hydrogen supply system is equipped with a hydrogen leakage emergency cut-off system. When the hydrogen leakage detector 8 detects that the hydrogen content exceeds the specified value, the controller (such as ECU11) will receive the feedback signal of the hydrogen leakage valve and send a command to the explosion-proof solenoid valve to cut off the hydrogen source.

[0042] Among them: the hydrogen injection valve group is symmetrically installed at the hydrogen injection holes reserved on the front cylinder head and the rear cylinder head of the hydrogen rotor machine.

[0043] In the specific implementation process, a first set of hydrogen injection valves are installed at the hydrogen injection holes 16 reserved in the front cylinder head 18 of the hydrogen rotor machine 10, and a second set of hydrogen injection valves are installed at the hydrogen injection holes 16 reserved in the rear cylinder head 17 of the hydrogen rotor machine 10. The hydrogen rotor machine 10 is also connected to the intake pipe 12 and the exhaust pipe 13 respectively.

[0044] For example: the hydrogen spray holes are arranged on the front and rear cylinder heads, corresponding to the position of the hydrogen rotor machine compression chamber, within the range of 10° to 45° with the long axis of the cylinder body, and the front and rear cylinder heads are each arranged with 2 spray holes, with a hole diameter of 1.5 to 2 mm. The axis of the hydrogen spray hole 16 on the front cylinder head 18 of the hydrogen rotor machine 10 is 30° to 40° with the end face of the front cylinder head. The axis of the hydrogen spray hole 16 on the rear cylinder head 17 of the hydrogen rotor machine 10 is 30° to 40° with the end face of the rear cylinder head. Figure 2 and Figure 3 shown.

[0045] In the specific implementation process, the position of the rotor 19 is detected by the crank position sensor 15. When the air inlet 21 is about to be closed, the rotor 19 is installed in the Figure 2 The hydrogen injection valve 9 on the spray hole at position Ⅰ shown in the figure works, and as the rotor rotates, Figure 2 The hydrogen injection valve 9 on the spray hole at position Ⅰ shown in the figure is closed first. Figure 2 The hydrogen injection valve 9 on the spray hole at position II shown is closed. The exhaust port 22 corresponds to Figure 1 The exhaust pipe 13. Figure 2 In the embodiment, the air inlet 21 and the exhaust port 22 are both arranged on the cylinder body 20 , and the rotor rotation direction 23 indicates the movement direction of the rotor 19 .

[0046] The hydrogen injection valve group of this embodiment is symmetrically installed at the hydrogen injection holes reserved in the front and rear cylinder heads of the hydrogen rotor engine, which belongs to the hydrogen compression chamber direct injection technology, thus improving the charging efficiency and further improving the engine power.

[0047] In the specific implementation process, the controller is used to control the opening time of the hydrogen injection valve group according to the rotor machine speed and load conditions, so as to realize the injection of hydrogen at multiple points of the hydrogen rotor machine cylinder at different times to achieve the purpose of hydrogen stratified combustion.

[0048] In one or more embodiments, the controller is used to control only one group of hydrogen injection valves to open when the rotor machine speed is not greater than a first speed and the load is not greater than a first load.

[0049] The load is expressed as a percentage of the intake pressure below and is explained in detail:

[0050] For example: when the rotor speed is ≤4500 rpm and the intake pressure is not greater than 30%, only one set of injection valves will work:

[0051] Specifically, if Figure 2 When the hydrogen injection valve on the spray hole in position Ⅰ shown in the figure is working, Figure 2 The hydrogen injection valve on the spray hole in position II shown is closed; Figure 2 When the hydrogen injection valve on the spray hole in position Ⅰ is closed, Figure 2 The hydrogen injection valve on the spray hole in position II shown is working; the injection pulse width is determined by the ECU.

[0052] In one or more embodiments, the controller is used to control the first group of hydrogen injection valves and the second group of hydrogen injection valves to open when the rotor speed is greater than the first speed and less than the second speed, and the load is greater than the first load and less than the second load.

[0053] For example:

[0054] The load is expressed as a percentage of the intake pressure below and is explained in detail:

[0055] When the rotor speed is between 4500 and 6500 rpm and the intake pressure is between 30% and 70%, the two groups of injection valves have an overlapping area. Figure 2 When the hydrogen injection valve on the spray hole in position Ⅰ shown in the figure is opened, Figure 2 The hydrogen injection valve on the spray hole at position II shown is also opened, and the injection pulse width is determined by the ECU based on the engine speed and load.

[0056] In one or more embodiments, the controller is used to: when the rotor speed is greater than the second speed and less than the third speed, and the load is greater than the second load and less than the third load, control the opening time of the second group of hydrogen injection valves to be greater than the opening time of the first group of hydrogen injection valves.

[0057] For example:

[0058] The load is expressed as a percentage of the intake pressure below and is explained in detail:

[0059] When the rotor speed is between 6500 and 8000 rpm and the intake pressure is between 70% and 100%, Figure 2 The opening time of the hydrogen injection valve on the spray hole at position II shown is longer than that shown in FIG. Figure 2 The hydrogen injection valve on the spray hole at position Ⅰ shown has an injection pulse width determined by the ECU.

[0060] In the above embodiment, the engine load is evaluated by the intake pressure;

[0061] Among them, the injection pulse width refers to the length of time that the ECU controls the injector to inject fuel each time. Here, the injection pulse width refers to the length of time that the engine ECU controls the hydrogen injection valve to inject hydrogen each time. The injection pulse width is determined comprehensively based on the engine speed, torque, temperature and intake conditions.

[0062] This embodiment controls the opening time of the hydrogen injection valve group according to the rotor machine speed and load conditions, thereby solving the problem that the hydrogen injection in the air duct of the current hydrogen duct injection rotor machine squeezes the air intake volume, causing low air charging efficiency and further affecting the engine power and efficiency. It realizes the injection of hydrogen at different times at multiple points in the hydrogen rotor machine cylinder and uniform mixing of hydrogen, thereby achieving the purpose of stratified combustion of hydrogen and obtaining higher thermal efficiency.

[0063] Embodiment 2

[0064] This embodiment provides a combustion control method for a hydrogen rotor machine with end-face hydrogen injection, which specifically includes the following steps:

[0065] The opening time of the hydrogen injection valve group is controlled according to the rotor machine speed and load conditions, so that hydrogen can be injected at multiple points in the hydrogen rotor machine cylinder at different times to achieve the purpose of hydrogen stratified combustion; wherein, the hydrogen injection valve group includes a first group of hydrogen injection valves and a second group of hydrogen injection valves, which are respectively installed at the hydrogen spray holes reserved in the front cylinder head and the rear cylinder head of the hydrogen rotor machine.

[0066] When the rotor speed is not greater than the first speed (e.g., 4500 rpm) and the load is not greater than the first load (e.g., the intake pressure is 30%), only one group of hydrogen injection valves is controlled to open;

[0067] When the rotor speed is greater than the first speed (e.g., 4500 rpm) and less than the second speed (e.g., 6500 rpm), and the load is greater than the first load (e.g., the intake pressure is 30%) and less than the second load (e.g., the intake pressure is 70%), the first group of hydrogen injection valves and the second group of hydrogen injection valves are controlled to open;

[0068] When the rotor speed is greater than the second speed (e.g., 6500 rpm) and less than the third speed (e.g., 8000 rpm), and the load is greater than the second load (e.g., the intake pressure is 70%) and less than the third load (e.g., the intake pressure is 100%), the opening time of the second group of hydrogen injection valves is controlled to be greater than the opening time of the first group of hydrogen injection valves.

[0069] In this embodiment, the engine load is evaluated using the intake air pressure.

[0070] In one or more embodiments, the hydrogen rotor engine combustion control method further includes:

[0071] Receive feedback signals from the hydrogen leakage valve and send instructions to the explosion-proof solenoid valve to cut off the hydrogen source.

[0072] 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 hydrogen rotor combustion control system with end-face hydrogen injection, characterized in that: include: The hydrogen injection valve group is symmetrically installed at the hydrogen injection holes reserved on the front and rear cylinder heads of the hydrogen rotor engine; A first set of hydrogen injection valves is installed at the hydrogen injection holes reserved in the front cylinder head of the hydrogen rotor machine, and a second set of hydrogen injection valves is installed at the hydrogen injection holes reserved in the rear cylinder head of the hydrogen rotor machine; the hydrogen injection holes are arranged on the front and rear cylinder heads, corresponding to the compression chamber positions of the hydrogen rotor machine, within the range of 10° to 45° with the long axis of the cylinder body, and two injection holes are arranged on the front and rear cylinder heads respectively, with a hole diameter of 1.5 to 2 mm; A controller is used to control the opening time of the hydrogen injection valve group according to the rotor machine speed and load conditions, so as to realize the injection of hydrogen at multiple points of the hydrogen rotor machine cylinder at different times, so as to achieve the purpose of hydrogen stratified combustion; The axis of the hydrogen spray hole on the front cylinder cover of the hydrogen rotor machine is 30° to 40° with the end surface of the front cylinder cover; The axis of the hydrogen spray hole on the rear cylinder cover of the hydrogen rotor machine is 30° to 40° with the end surface of the rear cylinder cover; The controller is used to: when the rotor machine speed is not greater than the first speed and the load is not greater than the first load, control only one group of hydrogen injection valves to open; When the rotor machine speed is greater than the first speed and less than the second speed, and the load is greater than the first load and less than the second load, the first group of hydrogen injection valves and the second group of hydrogen injection valves are controlled to open; When the rotor speed is greater than the second speed and less than the third speed, and the load is greater than the second load and less than the third load, the opening time of the second group of hydrogen injection valves is controlled to be greater than the opening time of the first group of hydrogen injection valves; The controller is also connected to a hydrogen leak detector and an explosion-proof solenoid valve respectively. The hydrogen leak detector is used to send a hydrogen leak valve signal to the controller when the hydrogen content exceeds a specified value. When the controller receives the hydrogen leak valve feedback signal, it sends an instruction to the explosion-proof solenoid valve to cut off the hydrogen source. In the hydrogen rotor engine combustion control system, hydrogen is reduced in pressure from the hydrogen cylinder through the primary pressure reducing valve and the secondary pressure reducing valve in sequence before reaching the hydrogen injection rail, and then enters the cylinder through the hydrogen injection valve; an explosion-proof solenoid valve is also connected in series between the hydrogen cylinder and the primary pressure reducing valve, and a fire-proof check valve is also connected in series between the primary pressure reducing valve and the secondary pressure reducing valve; a pressure sensor is also provided on the hydrogen injection rail for detecting the pressure on the hydrogen injection rail and transmitting it to the controller; the controller is also connected to the hydrogen leak detector, the hydrogen injection valve, the spark plug and the crank position sensor respectively.

2. A combustion control method for a hydrogen rotor machine with end-face hydrogen injection, characterized in that: include: The opening time of the hydrogen injection valve group is controlled according to the rotor machine speed and load conditions, so that hydrogen can be injected at multiple points of the hydrogen rotor machine cylinder at different times to achieve the purpose of hydrogen stratified combustion; wherein the hydrogen injection valve group includes a first group of hydrogen injection valves and a second group of hydrogen injection valves, which are respectively installed at the hydrogen injection holes reserved on the front cylinder head and the rear cylinder head of the hydrogen rotor machine; the hydrogen injection holes are arranged on the front and rear cylinder heads, corresponding to the position of the hydrogen rotor machine compression chamber, within the range of 10° to 45° with the long axis of the cylinder body, and the front and rear cylinder heads are each arranged with 2 injection holes, with a hole diameter of 1.5 to 2 mm; When the rotor machine speed is not greater than the first speed and the load is not greater than the first load, only one group of hydrogen injection valves is controlled to open; When the rotor machine speed is greater than the first speed and less than the second speed, and the load is greater than the first load and less than the second load, the first group of hydrogen injection valves and the second group of hydrogen injection valves are controlled to open; When the rotor speed is greater than the second speed and less than the third speed, and the load is greater than the second load and less than the third load, the opening time of the second group of hydrogen injection valves is controlled to be greater than the opening time of the first group of hydrogen injection valves; The hydrogen rotor machine combustion control method further includes: receiving a feedback signal from a hydrogen leakage valve and sending a command to an explosion-proof solenoid valve to cut off a hydrogen source; The hydrogen is reduced in pressure from the hydrogen cylinder through the primary pressure reducing valve and the secondary pressure reducing valve in sequence, and then reaches the hydrogen injection rail, and then enters the cylinder through the hydrogen injection valve; wherein an explosion-proof solenoid valve is also connected in series between the hydrogen cylinder and the primary pressure reducing valve, and a fire-proof check valve is also connected in series between the primary pressure reducing valve and the secondary pressure reducing valve; a pressure sensor is also provided on the hydrogen injection rail, which is used to detect the pressure on the hydrogen injection rail and transmit it to the controller; the controller is also connected to the hydrogen leak detector, the hydrogen injection valve, the spark plug and the crank position sensor respectively; The axis of the hydrogen spray hole on the front cylinder cover of the hydrogen rotor machine is 30° to 40° with the end surface of the front cylinder cover; The axis of the hydrogen spray hole on the rear cylinder cover of the hydrogen rotor machine is 30° to 40° with the end surface of the rear cylinder cover.

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