Fuel supply system of ammonia gas engine, control method of fuel supply system and vehicle

Abstract

The invention discloses a fuel supply system of an ammonia gas engine, a control method of the fuel supply system and a vehicle. The control method comprises the steps that the target rotating speed and the target load of the ammonia gas engine are obtained; determining a target working condition interval of the ammonia gas engine according to the target rotating speed and the target load; obtaining a target flow parameter of the fuel supply system according to the target working condition interval; according to the target flow parameters, the target flow of ignition active fuel, the target flow of air and the target flow of EGR are obtained; the actual flow of the ammonia gas is controlled according to the target flow of the ammonia gas, the actual flow of the ignition active fuel is controlled according to the target flow of the ignition active fuel, the actual flow of the air is controlled according to the target flow of the air, and the actual flow of the EGR is controlled according to the target flow of the EGR, so that the ammonia gas provided for the ammonia gas engine can be stably and reliably combusted; and the target working condition requirement of the ammonia gas engine can be met, the flow calculation process of each gas is simple, and quick response of the ammonia gas engine is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a fuel supply system for an ammonia engine, a control method thereof, and a vehicle. Background Art

[0002] Ammonia is a zero-carbon fuel with numerous advantages, including low cost, safety, ease of storage and transportation, and high energy density. The volumetric energy density of liquid ammonia is twice that of liquid hydrogen, and its chemically equivalent mixture has a calorific value comparable to fossil fuels, enabling it to achieve power density comparable to lean-burn diesel. Therefore, as a member of the diverse zero-carbon power mix, ammonia engines have the potential to revitalize the traditional engine industry.

[0003] Ammonia has the characteristics of low reactivity and high auto-ignition temperature, which makes its ignition concentration range narrow. In addition, the minimum ignition energy of ammonia is more than 60 times that of gasoline, and the laminar flame speed is about 1 / 5 of that of gasoline, which greatly increases the difficulty of developing ammonia engines. In addition, under overly lean and overly rich mixture conditions, the concentration of ammonia-air mixture in local areas of the cylinder may be close to the ignition limit, and there is a risk of misfire (i.e., failure to successfully ignite). At the same time, the ignition energy of current spark plugs is generally about 100mJ, which is far from meeting the ignition requirements of ammonia, and also makes it impossible for ammonia fuel to ignite reliably, thereby affecting the power output of the engine. Summary of the Invention

[0004] The present invention provides a fuel supply system for an ammonia engine, a control method thereof, and a vehicle, so as to ensure that the ammonia fuel can be stably and reliably ignited.

[0005] According to one aspect of the present invention, a method for controlling a fuel supply system of an ammonia engine is provided, comprising:

[0006] Obtaining a target speed and a target load of the ammonia engine;

[0007] determining a target operating range of the ammonia engine according to the target speed and the target load;

[0008] acquiring target flow parameters of the fuel supply system according to the target operating range; the target flow parameters including: a target ammonia flow, a target flow ratio of the target ammonia flow to the target flow of the pilot active fuel, a target excess air coefficient, and a target EGR rate;

[0009] Obtaining a target flow rate of the ignition active fuel, a target air flow rate, and a target EGR flow rate according to each of the target flow rate parameters;

[0010] The actual flow of ammonia is controlled according to the target flow of ammonia, the actual flow of the ignition active fuel is controlled according to the target flow of the ignition active fuel, the actual flow of air is controlled according to the target flow of air, and the actual flow of EGR is controlled according to the target flow of EGR.

[0011] Optionally, obtaining a target flow rate of the ignition active fuel, a target air flow rate, and a target EGR flow rate according to each of the target flow rate parameters includes:

[0012] Obtaining a target flow rate of the ignition active fuel according to the target flow rate of ammonia and the target flow rate ratio;

[0013] Obtaining the target air flow rate according to the target ammonia flow rate and the target flow rate of the ignition active fuel;

[0014] The EGR target flow rate is obtained based on the air target flow rate and the target EGR rate.

[0015] Optionally, obtaining the target flow rate of the ignition active fuel according to the target flow rate of ammonia and the target flow rate ratio includes:

[0016] Obtaining a first preset relationship between the ammonia flow rate, the first flow ratio, and the ignition active fuel flow rate;

[0017] Based on the first preset relationship, obtaining the target flow rate of the ignition active fuel according to the target flow rate of ammonia and the first flow ratio;

[0018] The first preset relationship is: mYR=mNH3 / n; wherein mYR is the target flow rate of the ignition active fuel, mNH3 is the target flow rate of ammonia, and n is the target flow ratio.

[0019] Optionally, obtaining the target air flow rate according to the target ammonia flow rate and the target flow rate of the ignition active fuel includes:

[0020] Obtaining a second preset relationship among the ammonia flow rate, the ignition active fuel flow rate, and the air flow rate;

[0021] Based on the second preset relationship, the target air flow rate is obtained according to the target excess air coefficient, the target ammonia flow rate, and the target flow rate of the pilot active fuel;

[0022] The second preset relationship is: mair=a*(θNH3+θYR)*(mNH3+mYR);

[0023] Among them, mair is the target air flow rate, a is the target excess air coefficient, mYR is the target flow rate of the pilot active fuel, mNH3 is the target ammonia flow rate, θNH3 is the theoretical air-fuel ratio of ammonia, and θYR is the air-fuel ratio of the pilot active fuel.

[0024] Optionally, obtaining the EGR target flow rate according to the target air flow rate and the target EGR rate includes:

[0025] obtaining a third preset relationship among EGR flow rate, EGR rate, and air flow rate;

[0026] Based on the third preset relationship, obtaining the EGR target flow rate according to the target air flow rate and the target EGR rate;

[0027] The third preset relationship is: megr=Regr*mair / (1-Regr);

[0028] Wherein, megr is the EGR target flow rate, Regr is the target EGR rate, and mair is the air target flow rate.

[0029] Optionally, the operating range of the ammonia engine includes a first operating range, a second operating range, a third operating range and a fourth operating range;

[0030] The ammonia flow rate is m0; the flow ratio of the ammonia flow rate to the ignition active fuel flow rate is n0, the excess air coefficient is a0, and the EGR rate is Regr0;

[0031] Under the first and third operating conditions, m1≤m0≤m2, 9≤n0≤19, 1≤a0≤1.1, and 10%≤Regr0≤15%;

[0032] Under the second operating condition, m3≤m0≤m4, 4≤n0≤5, 1.2≤a0≤1.4, and 5%≤Regr0≤10%;

[0033] Under the fourth operating condition, m5≤m0≤m6, 4≤n0≤5, 1.1≤a0≤1.1, and 15%≤Regr0≤20%.

[0034] Optionally, the operating range of the ammonia engine includes a first operating range, a second operating range, a third operating range and a fourth operating range;

[0035] Determining a target operating range of the ammonia engine according to the target speed and the target load includes:

[0036] When the target speed is greater than the first speed and less than or equal to the second speed, and the target load is greater than the first load and less than the second load, determining the target operating condition range to be the first operating condition range;

[0037] When the target speed is greater than the first speed and less than or equal to a third speed, and the target load is less than or equal to the first load, determining the target operating condition range to be the second operating condition range;

[0038] When the target speed is greater than the third speed and less than or equal to the second speed, and the target load is less than or equal to the first load, determining the target operating condition range to be the third operating condition range;

[0039] When the target speed is greater than the third speed and less than or equal to the second speed, and the target load is greater than the first load and less than or equal to the second load, determining the target operating condition range to be the fourth operating condition range;

[0040] The first speed is greater than or equal to zero, and is less than the third speed, and the third speed is less than the second speed; the first load is greater than zero, and is less than the second load.

[0041] According to another aspect of the present invention, a control device for a fuel supply system of an ammonia engine is provided, comprising:

[0042] a target operating condition information acquisition module, configured to acquire a target speed and a target load of the ammonia engine;

[0043] a target operating range determining module, which determines a target operating range of the ammonia engine according to the target speed and the target load;

[0044] a flow parameter acquisition module, configured to acquire target flow parameters of the fuel supply system according to the target operating range; the target flow parameters including: a target ammonia flow, a target ammonia flow and a target flow of the pilot-active fuel, a target excess air coefficient, and a target EGR rate;

[0045] a target flow acquisition module, which acquires a target flow of the ignition active fuel, a target air flow, and a target EGR flow according to the target flow parameters;

[0046] A flow control module is used to control the actual flow of ammonia according to the ammonia target flow, control the actual flow of the ignition active fuel according to the target flow of the ignition active fuel, control the actual flow of air according to the air target flow, and control the actual flow of EGR according to the EGR target flow.

[0047] According to another aspect of the present invention, there is provided a fuel supply system for an ammonia engine, comprising: a supercharger, a throttle valve, an ammonia fuel injector, a pilot-active fuel injector, an EGR valve, and a controller;

[0048] The throttle valve, the ammonia fuel injector, the pilot-active fuel injector, and the EGR valve are all electrically and / or communicatively connected to the controller;

[0049] The controller is used to execute the above-mentioned control method of the fuel supply system of the ammonia engine.

[0050] According to another aspect of the present invention, a vehicle is provided, comprising the above-mentioned fuel supply system for the ammonia engine.

[0051] The control method of the fuel supply system of an ammonia engine provided by an embodiment of the present invention first obtains the target speed and target load of the ammonia engine, so that the target operating range of the ammonia engine can be determined according to the target speed and target load, thereby obtaining the target flow parameters of the fuel supply system according to the target operating range. By dividing the operating range, each operating range has a corresponding flow parameter, which can simplify the flow parameter acquisition process, thereby facilitating improving the response speed of the ammonia engine. Then, the target flow rate of the ignition active fuel, the target air flow rate and the EGR target flow rate are obtained according to each target flow parameter. When controlling the operation of the ammonia engine, the actual flow rate of the ignition active fuel can be controlled according to the target flow rate of the ignition active fuel, the actual air flow rate can be controlled according to the target air flow rate, and the actual EGR flow rate can be controlled according to the EGR target flow rate, so that the finally determined gas flow rate can enable the ammonia provided to the ammonia engine to burn stably and reliably, and can meet the target operating requirements of the ammonia engine, and the flow calculation process of each gas is simple, which is conducive to the rapid response of the ammonia engine.

[0052] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0054] Figure 1 This is a flow chart of a method for controlling a fuel supply system of an ammonia engine provided by an embodiment of the present invention;

[0055] Figure 2 This is a schematic diagram of operating condition partitioning of an ammonia engine provided by an embodiment of the present invention;

[0056] Figure 3 This is a flow chart of another method for controlling a fuel supply system of an ammonia engine provided by an embodiment of the present invention;

[0057] Figure 4 1 is a schematic structural diagram of a control device for a fuel supply system of an ammonia engine provided by an embodiment of the present invention;

[0058] Figure 5 This is a schematic structural diagram of a fuel supply system for an ammonia engine provided by an embodiment of the present invention;

[0059] Figure 6 This is a control system diagram of a fuel supply system for an ammonia engine provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0060] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0061] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0062] An embodiment of the present invention provides a control method for the fuel supply system of an ammonia engine, which can ensure stable and reliable ignition of the ammonia fuel. The control method for the fuel supply system of an ammonia engine can be executed by the control device of the fuel supply system of an ammonia engine provided by an embodiment of the present invention. The control device of the fuel supply system of an ammonia engine can be implemented in the form of software and / or hardware, and the control device of the fuel supply system of an ammonia engine can be configured in the controller of the fuel supply system of the ammonia engine.

[0063] Figure 1 FIG. 1 is a flow chart of a method for controlling a fuel supply system of an ammonia engine provided by an embodiment of the present invention. Figure 1 As shown, the control method of the fuel supply system of the ammonia engine includes:

[0064] S110: Obtain a target speed and a target load of the ammonia engine.

[0065] Specifically, an ammonia engine is an engine that uses ammonia as fuel. The target speed and target load of the ammonia engine can be determined based on the engine control signal. For example, when an ammonia engine is used in a vehicle, the target speed and target load of the engine can be determined based on the accelerator pedal opening.

[0066] S120: Determine a target operating range of the ammonia engine according to the target speed and the target load.

[0067] Specifically, the engine's operating conditions can be divided into multiple operating ranges based on speed and load. After obtaining the target speed and target load, a target operating point of the ammonia engine can be determined based on the target speed and target load of the ammonia engine. After determining the target operating point, the operating range to which the target operating point belongs can be determined, and this operating range can be determined as the target operating range.

[0068] For example, Figure 2 This is a schematic diagram of the working conditions of an ammonia engine provided by an embodiment of the present invention. Figure 2As shown, the operating condition range of the ammonia engine includes a first operating condition range A1, a second operating condition range A2, a third operating condition range A3, and a fourth operating condition range A4; determining the target operating condition range of the ammonia engine according to the target speed and the target load includes: when the target speed is greater than the first speed r1 and less than or equal to the second speed r2, and the target load is greater than the first load w1 and less than the second load w2, determining the target operating condition range as the first operating condition range A1; when the target speed is greater than the first speed r1 and less than or equal to the third speed r3, and the target load is less than or equal to the first load w1, determining the target operating condition range as the second operating condition range A2; when the target speed is greater than the third speed r3 and less than or equal to the second speed r2, and the target load is less than or equal to the first load w1, determining the target operating condition range as the third operating condition range A3; when the target speed is greater than the third speed r3 and less than or equal to the second speed r2, and the target load is greater than the first load w1 and less than or equal to the second load w2, determining the target operating condition range as the fourth operating condition range A4; wherein, the first speed r1 is greater than or equal to zero, and the first speed r1 is less than the third speed r3, and the third speed r3 is less than the second speed r2; the first load w1 is greater than zero, and the first load w1 is less than the second load w2.

[0069] Specifically, according to the above embodiments, in the first operating condition range A1, the range of the speed r (unit: rpm) of the ammonia engine is r1 < r ≤ r2, and the range of the load w (unit: %) is w1 < w ≤ w2; in the second operating condition range A2, the speed range of the ammonia engine is r1 < r ≤ r3, and the load range is 0 < w ≤ w1; in the third operating condition range A2, the speed range of the ammonia engine is r3 < r ≤ r2, and the load range is 0 < w ≤ w1; in the fourth operating condition range A4, the speed range of the ammonia engine is r3 < r ≤ r2, and the load range is w1 < w ≤ w2. After obtaining the target speed and the target load, the target speed can be matched with the speed ranges corresponding to each operating condition range, and the target load can be matched with the load speed ranges corresponding to each operating condition range, so as to quickly determine the target operating condition of the ammonia engine. In one embodiment, the target speed and the target load can also be compared with the speed ranges and operating condition ranges of each operating condition range in sequence until it is determined that the target speed and the target load respectively meet the speed ranges and operating condition ranges of a certain operating condition range, and then the target operating condition of the ammonia engine can be determined.

[0070] In an exemplary embodiment, the first speed r1 is the minimum speed allowed during normal operation of the ammonia engine, the second speed r2 is the maximum speed allowed during normal operation of the ammonia engine, and the second speed r3 can be an intermediate speed between the minimum and maximum speeds, i.e., r3 = (r2 - r1) / 2. The second load w2 can be the maximum load allowed by the ammonia engine, and the second load w1 can be 50% of the second load w2, i.e., w1 = w2 / 2.

[0071] S130 : Obtain target flow parameters of the fuel supply system according to the target operating range.

[0072] The target flow parameters include: ammonia target flow, a target flow ratio of ammonia target flow and pilot active fuel target flow, a target excess air coefficient, and a target EGR rate.

[0073] Specifically, the flow parameters corresponding to different operating intervals are the same or different, and the corresponding flow parameters under each operating interval are determined by testing. During the test, when determining the flow parameters under a certain operating interval, the average value of the flow parameters of each operating point under the operating interval can be used as the flow parameter of the operating interval. For example, when determining the ammonia flow rate under a certain operating interval, the average value of the ammonia flow rate at each operating point under the operating interval can be used as the ammonia flow rate corresponding to the operating interval. The principles of other flow parameters are the same. In this way, when obtaining the target flow parameter corresponding to the target operating interval, a determined value can be directly obtained, which can simplify the determination process of each flow parameter. Alternatively, when determining the flow parameter under a certain operating interval, the value range of each flow parameter under the operating interval can also be determined. In this way, when obtaining the target flow parameter corresponding to the target operating interval, a more suitable flow parameter value can be selected within the value range according to the target operating condition, so that the operation of the ammonia engine is more in line with the target operating condition. After determining the target operating interval, the flow parameter under the target operating interval can be obtained and determined as the target flow parameter. By dividing the operating condition intervals, each operating condition interval has a corresponding flow parameter, which can simplify the process of obtaining the flow parameter, thereby facilitating improving the response speed of the ammonia engine.

[0074] Exemplarily, the ammonia flow rate is m0; the flow ratio of the ammonia flow rate to the ignition active fuel flow rate is n0, the excess air coefficient is a0, and the EGR rate is Regr0; under the first and third operating conditions, m1≤m0≤m2, 9≤n0≤19, 1≤a0≤1.1, and 10%≤Regr0≤15%; under the second operating condition, m3≤m0≤m4, 4≤n0≤5, 1.2≤a0≤1.4, and 5%≤Regr0≤10%; under the fourth operating condition, m5≤m0≤m6, 4≤n0≤5, 1.1≤a0≤1.1, and 15%≤Regr0≤20%.

[0075] Specifically, by setting the value range of each flow parameter under each operating condition interval, after determining the target operating condition interval, the flow parameter that is more consistent with the operating condition of the ammonia engine under the target operating condition interval can be obtained and determined as the target flow parameter, so that the operation of the ammonia engine is more consistent with the target operating condition. It should be noted that the above embodiment only exemplarily shows the value range of each flow parameter under each operating condition interval. Through testing, when the flow parameters are within the above value range under each operating condition interval, the determined gas flow rates can make ammonia burn stably and reliably, and can meet the target operating condition requirements of the engine. In other feasible embodiments of the present invention, other reliable numerical ranges can also be determined according to different vehicle models or different engines, and the embodiments of the present invention do not make specific limitations on this.

[0076] S140 , obtaining a target flow rate of the ignition active fuel, a target air flow rate, and a target EGR flow rate according to each target flow rate parameter.

[0077] S150, controlling the actual flow of ammonia according to the target flow of ammonia, controlling the actual flow of the ignition active fuel according to the target flow of the ignition active fuel, controlling the actual flow of air according to the target flow of air, and controlling the actual flow of EGR according to the target flow of EGR.

[0078] Specifically, after obtaining each target flow parameter, the target flow of the ignition active fuel, the target air flow and the EGR target flow can be obtained according to each target flow parameter, so that the actual flow of the ignition active fuel can be controlled according to the target flow of the ignition active fuel, the actual air flow can be controlled according to the air target flow, and the actual EGR flow can be controlled according to the EGR target flow. This can ensure stable and reliable combustion of the ammonia provided to the ammonia engine, and the flow calculation process of each gas is simple, which is conducive to the rapid response of the ammonia engine.

[0079] The control method of the fuel supply system of an ammonia engine provided by an embodiment of the present invention first obtains the target speed and target load of the ammonia engine, so that the target operating range of the ammonia engine can be determined according to the target speed and target load, thereby obtaining the target flow parameters of the fuel supply system according to the target operating range. By dividing the operating range, each operating range has a corresponding flow parameter, which can simplify the flow parameter acquisition process, thereby facilitating improving the response speed of the ammonia engine. Then, the target flow rate of the ignition active fuel, the target air flow rate and the EGR target flow rate are obtained according to each target flow parameter. When controlling the operation of the ammonia engine, the actual flow rate of the ignition active fuel can be controlled according to the target flow rate of the ignition active fuel, the actual air flow rate can be controlled according to the target air flow rate, and the actual EGR flow rate can be controlled according to the EGR target flow rate, so that the finally determined gas flow rate can enable the ammonia provided to the ammonia engine to burn stably and reliably, and can meet the target operating requirements of the ammonia engine, and the flow calculation process of each gas is simple, which is conducive to the rapid response of the ammonia engine.

[0080] Optional, Figure 3 FIG. 1 is a flow chart of another method for controlling a fuel supply system of an ammonia engine provided by an embodiment of the present invention. Figure 3 As shown, the control method of the fuel supply system of the ammonia engine includes:

[0081] S210: Obtain a target speed and a target load of the ammonia engine.

[0082] S220: Determine a target operating range of the ammonia engine according to the target speed and the target load.

[0083] S230 : Obtain target flow parameters of the fuel supply system according to the target operating range.

[0084] The target flow parameters include: ammonia target flow, a target flow ratio of ammonia target flow and pilot active fuel target flow, a target excess air coefficient, and a target EGR rate.

[0085] Specifically, the target flow ratio of ammonia target flow to pilot fuel target flow is the ratio of the target ammonia flow to the target pilot fuel flow. The excess air coefficient is the ratio of the actual air demand to the theoretical air demand. The EGR rate is the ratio of the exhaust gas volume in the EGR (Exhaust Gas Recirculation) line to the total intake air drawn into the cylinder.

[0086] S240: Obtain a target flow rate of the ignition active fuel according to the target flow rate of ammonia and the target flow rate ratio.

[0087] Specifically, different ammonia flow rates correspond to different pilot active fuel flow rates, ensuring that the pilot active fuel flow rate matches the ammonia flow rate, ensuring that the pilot active fuel can ignite ammonia under target operating conditions. The target ammonia flow rate and target flow rate ratio can be obtained through testing. Once the target operating range is determined, the target pilot active fuel flow rate can be directly determined based on the target ammonia flow rate and target flow rate ratio.

[0088] For example, when obtaining the target flow rate of the ignition active fuel according to the target flow rate of ammonia and the target flow rate ratio, the first preset relationship between the ammonia flow rate, the first flow rate ratio, and the flow rate of the ignition active fuel can be obtained first; then, based on the first preset relationship, the target flow rate of the ignition active fuel can be obtained according to the target flow rate of ammonia and the first flow rate ratio; the first preset relationship is: m YR =m NH3 / n; where m YR is the target flow rate of igniting active fuel, m NH3 The target flow rate of ammonia gas and the target flow rate ratio are substituted into the formula shown in the first preset relationship to calculate the target flow rate of the corresponding ignition active fuel.

[0089] S250: Obtain a target air flow rate according to the target ammonia flow rate and the target flow rate of the ignition active fuel.

[0090] Specifically, for an ammonia fuel engine, since the active fuel needs to be ignited for ignition, the air flow rate also needs to match the ammonia flow rate and the ignition active fuel flow rate to ensure that the ammonia can be ignited and burned.

[0091] For example, a second preset relationship among ammonia flow rate, ignition active fuel flow rate, and air flow rate may be first obtained; based on the second preset relationship, the target air flow rate may be obtained according to the target excess air coefficient, the target ammonia flow rate, and the target flow rate of the ignition active fuel; the second preset relationship is: m air =a*(θ NH3 +θ YR )*(m NH3 +m YR ); where m air is the target air flow rate, a is the target excess air coefficient, m YR is the target flow rate of igniting active fuel, m NH3 is the target flow rate of ammonia, θ NH3 is the theoretical air-fuel ratio of ammonia, θ YR is the air-fuel ratio of the ignition active fuel. The theoretical air-fuel ratio of ammonia is θ NH3 and the pilot active fuel air-fuel ratio θ YRIt can be a predetermined constant. The second preset relationship can be obtained by test fitting. Then, when obtaining the target excess air coefficient a and the target air flow m NH3 and the target flow rate m of the ignition active fuel YR After that, the target excess air coefficient a and target air flow m can be NH3 and the target flow rate m of the ignition active fuel YR Substituting into the formula shown in the second preset relationship, the corresponding air target flow rate m can be determined air .

[0092] S260: Obtain an EGR target flow rate according to the target air flow rate and the target EGR rate.

[0093] Specifically, the exhaust gas after ammonia combustion can be circulated through the EGR pipe, so that the exhaust gas can be returned to the combustion chamber of the ammonia engine through the EGR pipe, which can reduce the nitrogen oxides (NO X ) concentration. On the other hand, the inert gas in the exhaust gas can ensure stable combustion of ammonia and suppress knock. The exhaust gas flow rate and air flow rate should be in a certain ratio to avoid abnormal combustion of ammonia. The EGR rate for each operating range can be determined through testing. Once the target operating range is determined, the corresponding target EGR rate can be determined. Once the target air flow rate is determined, the target EGR flow rate can be calculated based on the target air flow rate and the target EGR rate.

[0094] For example, when obtaining the EGR target flow rate according to the target air flow rate and the target EGR rate, the third preset relationship among the EGR flow rate, the EGR rate, and the air flow rate may be obtained first; then, based on the third preset relationship, the EGR target flow rate may be obtained according to the target air flow rate and the target EGR rate. The third preset relationship is: m egr =R egr *m air / (1-R egr ); where m egr is the EGR target flow rate, R egr is the target EGR rate, m air The third preset relationship can be obtained by test fitting, and then the air target flow rate m can be obtained after the air target flow rate is determined. air and target EGR rate R egr Substituting into the formula shown in the third preset relationship, the EGR target flow rate m can be determined egr .

[0095] It should be noted that the gas flow rate (including ammonia flow rate, ignition active fuel gas flow rate and EGR flow rate) includes volume flow rate and mass flow rate. In the embodiment of the present invention, the gas flow rate is preferably set to be mass flow rate.

[0096] S270, controlling the actual flow of ammonia according to the target flow of ammonia, controlling the actual flow of the ignition active fuel according to the target flow of the ignition active fuel, controlling the actual flow of air according to the target flow of air, and controlling the actual flow of EGR according to the target flow of EGR.

[0097] Based on the same inventive concept, an embodiment of the present invention further provides a control device for a fuel supply system of an ammonia engine, which is used to execute the control method for the fuel supply system of an ammonia engine provided by any embodiment of the present invention. The control device for the fuel supply system of an ammonia engine can be implemented by software and / or hardware. Therefore, the control device for the fuel supply system of an ammonia engine provided by an embodiment of the present invention includes the technical features of the control method for the fuel supply system of an ammonia engine provided by any embodiment of the present invention, and can achieve the beneficial effects of the control method for the fuel supply system of an ammonia engine provided by any embodiment of the present invention. The similarities can be referred to the above description of the control method for the fuel supply system of an ammonia engine provided by an embodiment of the present invention, and will not be repeated here.

[0098] Optional, Figure 4 FIG. 1 is a schematic structural diagram of a control device for a fuel supply system of an ammonia engine provided by an embodiment of the present invention. Figure 4 As shown, the control device of the fuel supply system of the ammonia engine includes: a target operating condition information acquisition module 100, which is used to obtain the target speed and target load of the ammonia engine; a target operating condition interval determination module 200, which determines the target operating condition interval of the ammonia engine according to the target speed and target load; a flow parameter acquisition module 300, which is used to obtain the target flow parameters of the fuel supply system according to the target operating condition interval; the target flow parameters include: ammonia target flow, a target flow ratio of ammonia target flow and ignition active fuel target flow, a target excess air coefficient and a target EGR rate; a target flow acquisition module 400, which obtains the target flow of the ignition active fuel, the air target flow and the EGR target flow according to each target flow parameter; a flow control module 500, which is used to control the actual flow of ammonia according to the ammonia target flow, control the actual flow of the ignition active fuel according to the target flow of the ignition active fuel, control the actual flow of the air according to the air target flow, and control the actual EGR flow according to the EGR target flow.

[0099] The control device of the fuel supply system of the ammonia engine provided by the embodiment of the present invention divides the operating condition intervals so that each operating condition interval has corresponding flow parameters, which can simplify the process of obtaining the flow parameters, thereby facilitating improving the response speed of the ammonia engine. The gas flow rate finally determined can ensure stable and reliable combustion of the ammonia provided to the ammonia engine and can meet the target operating condition requirements of the ammonia engine. In addition, the flow calculation process of each gas is simple, which is conducive to the rapid response of the ammonia engine.

[0100] Optionally, the target flow acquisition module includes a target flow acquisition unit for ignition active fuel, which is used to obtain the target flow of ignition active fuel based on the ammonia target flow and the target flow ratio; an air target flow acquisition unit, which is used to obtain the air target flow based on the ammonia target flow and the target flow of ignition active fuel; and an EGR target flow acquisition unit, which is used to obtain the EGR target flow based on the air target flow and the target EGR rate.

[0101] Optionally, the target flow rate acquisition unit for igniting the active fuel includes: a first preset relationship acquisition subunit, used to obtain a first preset relationship between the ammonia flow rate, the first flow rate ratio and the ignition active fuel flow rate; a target flow rate acquisition subunit for igniting the active fuel, used to obtain the target flow rate of the ignition active fuel according to the ammonia target flow rate and the first flow rate ratio based on the first preset relationship; the first preset relationship is: m YR =m NH3 / n; where m YR is the target flow rate of igniting active fuel, m NH3 is the target flow rate of ammonia, and n is the target flow ratio.

[0102] Optionally, the air target flow rate acquisition unit includes: a second preset relationship acquisition subunit, used to obtain a second preset relationship between the ammonia flow rate, the ignition active fuel flow rate and the air flow rate; an air target flow rate acquisition subunit, used to obtain the air target flow rate according to the target excess air coefficient, the ammonia target flow rate and the target flow rate of the ignition active fuel based on the second preset relationship; the second preset relationship is: m air =a*(θ NH3 +θ YR )*(m NH3 +m YR ); where m air is the target air flow rate, a is the target excess air coefficient, m YR is the target flow rate of igniting active fuel, m NH3 is the target flow rate of ammonia, θ NH3 is the theoretical air-fuel ratio of ammonia, θ YR The air-fuel ratio for ignition active fuel.

[0103] Optionally, the EGR target flow acquisition unit includes a third preset relationship acquisition subunit for acquiring a third preset relationship among the EGR flow, the EGR rate, and the air flow; the EGR target flow acquisition subunit is used to acquire the EGR target flow according to the air target flow and the target EGR rate based on the third preset relationship; the third preset relationship is: m egr =R egr *m air / (1-R egr ); where m egr is the EGR target flow rate, R egr is the target EGR rate, m air is the target air flow rate.

[0104] Optionally, the operating range of the ammonia engine includes a first operating range, a second operating range, a third operating range and a fourth operating range; the ammonia flow rate is m0; the flow ratio of the ammonia flow rate to the ignition active fuel flow rate is n0, the excess air coefficient is a0, and the EGR rate is Regr0; under the first and third operating conditions, m1≤m0≤m2, 9≤n0≤19, 1≤a0≤1.1, and 10%≤Regr0≤15%; under the second operating condition, m3≤m0≤m4, 4≤n0≤5, 1.2≤a0≤1.4, and 5%≤Regr0≤10%; under the fourth operating condition, m5≤m0≤m6, 4≤n0≤5, 1.1≤a0≤1.1, and 15%≤Regr0≤20%.

[0105] Optionally, the operating range of the ammonia engine includes a first operating range, a second operating range, a third operating range and a fourth operating range; the target operating range determination module includes a first target operating range determination unit, which is used to determine that the target operating range is the first operating range when the target speed is greater than the first speed and less than or equal to the second speed, and the target load is greater than the first load and less than the second load; the second target operating range determination unit is used to determine that the target operating range is the second operating range when the target speed is greater than the first speed and less than or equal to the third speed, and the target load is less than or equal to the first load; The target operating condition interval determination unit is used to determine that the target operating condition interval is the third operating condition interval when the target speed is greater than the third speed and less than or equal to the second speed, and the target load is less than or equal to the first load; the fourth target operating condition interval determination unit is used to determine that the target operating condition interval is the fourth operating condition interval when the target speed is greater than the third speed and less than or equal to the second speed, and the target load is greater than the first load and less than or equal to the second load; wherein the first speed is greater than or equal to zero, and the first speed is less than the third speed, and the third speed is less than the second speed; and the first load is greater than zero, and the first load is less than the second load.

[0106] Based on the same inventive concept, an embodiment of the present invention further provides a fuel supply system for an ammonia engine. Figure 5 This is a schematic structural diagram of a fuel supply system for an ammonia engine provided by an embodiment of the present invention. Figure 6 This is a control system diagram of a fuel supply system for an ammonia engine provided by an embodiment of the present invention, combined with reference to Figure 5 and Figure 6 The fuel supply system of the ammonia engine includes: a supercharger 1, a throttle 2, an ammonia fuel injector 3, an ignition-active fuel injector 4, an EGR valve 6 and a controller 7; the controller 7 is used to execute the control method of the fuel supply system of the ammonia engine provided by any embodiment of the present invention. Therefore, the fuel supply system of the ammonia engine provided by the embodiment of the present invention includes the technical features of the control method of the fuel supply system of the ammonia engine provided by any embodiment of the present invention, and can achieve the beneficial effects of the control method of the fuel supply system of the ammonia engine provided by any embodiment of the present invention. The similarities can be referred to the above description of the control method of the fuel supply system of the ammonia engine provided by the embodiment of the present invention, and will not be repeated here.

[0107] The supercharger 1 increases the fresh air intake by compressing it. Air can be delivered to the combustion chamber of the ammonia engine via the throttle valve 2. The throttle valve 2, ammonia fuel injector 3, pilot-activated fuel injector 4, and EGR valve 6 are all electrically and / or communicatively connected to a controller 7. This allows the controller 7 to, after determining the target flow rates of each gas, control the actual air flow rate by controlling the opening of the throttle valve 2, the actual ammonia flow rate by controlling the opening of the ammonia fuel injector 3, the actual flow rate of the pilot-activated fuel by controlling the opening of the pilot-activated fuel injector 4, and the EGR flow rate by controlling the opening of the EGR valve 6. This ensures that the actual flow rates of each gas supplied to the combustion chamber of the ammonia engine match the target flow rates, thereby enabling stable and reliable combustion of the ammonia and meeting the target operating conditions of the ammonia engine. The exhaust gas from the ammonia combustion passes sequentially through the EGR line 5 and the EGR valve 6 into the combustion chamber of the ammonia engine.

[0108] Based on the same inventive concept, an embodiment of the present invention further provides a vehicle, including the fuel supply system of the ammonia engine provided by any embodiment of the present invention. Therefore, the vehicle provided by an embodiment of the present invention includes the technical features of the fuel supply system of the ammonia engine provided by any embodiment of the present invention, and can achieve the beneficial effects of the fuel supply system of the ammonia engine provided by any embodiment of the present invention. The similarities can be referred to the above description of the fuel supply system of the ammonia engine provided by the embodiment of the present invention, and will not be repeated here.

[0109] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0110] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A method for controlling a fuel supply system of an ammonia engine, characterized in that: include: Obtaining a target speed and a target load of the ammonia engine; determining a target operating range of the ammonia engine according to the target speed and the target load; obtaining a target flow parameter of the fuel supply system according to the target operating range; The target flow parameters include: ammonia target flow, target flow ratio of ammonia target flow and ignition active fuel target flow, target excess air coefficient and target EGR rate; Obtaining a target flow rate of the ignition active fuel, a target air flow rate, and a target EGR flow rate according to each of the target flow rate parameters; The actual flow of ammonia is controlled according to the target flow of ammonia, the actual flow of the ignition active fuel is controlled according to the target flow of the ignition active fuel, the actual flow of air is controlled according to the target flow of air, and the actual flow of EGR is controlled according to the target flow of EGR.

2. The control method of the fuel supply system of the ammonia engine according to claim 1, characterized in that: Obtaining a target flow rate of the ignition active fuel, a target air flow rate, and a target EGR flow rate according to each of the target flow rate parameters includes: Obtaining a target flow rate of the ignition active fuel according to the target flow rate of ammonia and the target flow rate ratio; Obtaining the target air flow rate according to the target ammonia flow rate and the target flow rate of the ignition active fuel; The EGR target flow rate is obtained based on the air target flow rate and the target EGR rate.

3. The control method of the fuel supply system of the ammonia engine according to claim 2, characterized in that: Obtaining the target flow rate of the ignition active fuel according to the target flow rate of ammonia and the target flow rate ratio includes: Obtaining a first preset relationship between the ammonia flow rate, the first flow ratio, and the ignition active fuel flow rate; Based on the first preset relationship, obtaining the target flow rate of the ignition active fuel according to the target flow rate of ammonia and the first flow ratio; The first preset relationship is: m YR =m NH3 / n; where m YR is the target flow rate of the ignition active fuel, m NH3 is the target flow rate of ammonia, and n is the target flow ratio.

4. The control method of the fuel supply system of the ammonia engine according to claim 2, characterized in that: Obtaining the target air flow rate according to the target ammonia flow rate and the target flow rate of the ignition active fuel includes: Obtaining a second preset relationship among the ammonia flow rate, the ignition active fuel flow rate, and the air flow rate; Based on the second preset relationship, the target air flow rate is obtained according to the target excess air coefficient, the target ammonia flow rate, and the target flow rate of the pilot active fuel; The second preset relationship is: m air =a*(θ NH3 +θ YR )*(m NH3 +m YR ); Among them, m air is the target air flow rate, a is the target excess air coefficient, m YR is the target flow rate of the ignition active fuel, m NH3 is the target flow rate of ammonia, θ NH3 is the theoretical air-fuel ratio of ammonia, θ YR The air-fuel ratio for ignition active fuel.

5. The control method of the fuel supply system of the ammonia engine according to claim 2, characterized in that: Obtaining the EGR target flow rate according to the target air flow rate and the target EGR rate includes: obtaining a third preset relationship among EGR flow rate, EGR rate, and air flow rate; Based on the third preset relationship, obtaining the EGR target flow rate according to the target air flow rate and the target EGR rate; The third preset relationship is: egr =R egr *m air / (1-R egr ); Among them, m egr is the EGR target flow rate, R egr is the target EGR rate, m air is the target air flow rate.

6. The control method of the fuel supply system of the ammonia engine according to claim 1, characterized in that: The operating range of the ammonia engine includes a first operating range, a second operating range, a third operating range and a fourth operating range; The ammonia flow rate is m0; the flow ratio of the ammonia flow rate to the ignition active fuel flow rate is n0, the excess air coefficient is a0, and the EGR rate is Regr0; Under the first and third operating conditions, m1≤m0≤m2, 9≤n0≤19, 1≤a0≤1.1, and 10%≤Regr0≤15%; In the second working condition, m3≤m0≤m4, 4≤n0≤5, 1.2≤a0≤1.4, and, 5%≤Regr0≤10%; In the fourth working condition, m5≤m0≤m6, 4≤n0≤5, 1.1≤a0≤1.1, and 15%≤Regr0≤20%.

7. The control method of the fuel supply system of the ammonia engine according to claim 1, characterized in that: The operating range of the ammonia engine includes a first operating range, a second operating range, a third operating range and a fourth operating range; Determining a target operating range of the ammonia engine according to the target speed and the target load includes: When the target speed is greater than the first speed and less than or equal to the second speed, and the target load is greater than the first load and less than the second load, determining the target operating condition range to be the first operating condition range; When the target speed is greater than the first speed and less than or equal to a third speed, and the target load is less than or equal to the first load, determining the target operating condition range to be the second operating condition range; When the target speed is greater than the third speed and less than or equal to the second speed, and the target load is less than or equal to the first load, determining the target operating condition range to be the third operating condition range; When the target speed is greater than the third speed and less than or equal to the second speed, and the target load is greater than the first load and less than or equal to the second load, determining the target operating condition range to be the fourth operating condition range; The first speed is greater than or equal to zero, and is less than the third speed, and the third speed is less than the second speed; the first load is greater than zero, and is less than the second load.

8. A control device for a fuel supply system of an ammonia engine, characterized in that: include: a target operating condition information acquisition module, configured to acquire a target speed and a target load of the ammonia engine; a target operating range determining module, which determines a target operating range of the ammonia engine according to the target speed and the target load; a flow parameter acquisition module, configured to acquire a target flow parameter of the fuel supply system according to the target operating range; The target flow parameters include: ammonia target flow, ammonia target flow and ignition active fuel target flow, target excess air coefficient and target EGR rate; a target flow acquisition module, which acquires a target flow of the ignition active fuel, a target air flow, and a target EGR flow according to the target flow parameters; A flow control module is used to control the actual flow of ammonia according to the ammonia target flow, control the actual flow of the ignition active fuel according to the target flow of the ignition active fuel, control the actual flow of air according to the air target flow, and control the actual flow of EGR according to the EGR target flow.

9. A fuel supply system for an ammonia engine, characterized in that: include: Supercharger, throttle body, ammonia fuel injector, pilot-active fuel injector, EGR valve and controller; The throttle valve, the ammonia fuel injector, the pilot-active fuel injector, and the EGR valve are all electrically and / or communicatively connected to the controller; The controller is used to execute the control method of the fuel supply system of the ammonia engine according to any one of claims 1 to 8.

10. A vehicle, characterized in that: A fuel supply system for an ammonia engine comprising the ammonia engine according to claim 9.

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