Control method, device and equipment of natural gas engine and medium

Abstract

The invention discloses a natural gas engine control method, device and equipment and a medium. The method comprises the steps that working condition parameters of an engine are obtained, and the optimal inter-cooling temperature interval range of the engine is determined according to working conditions corresponding to the working condition parameters; under the condition that the engine does not knock, the inter-cooling temperature of the engine is adjusted to the inter-cooling temperature lower limit value corresponding to the optimal inter-cooling temperature interval range by controlling the rotating speed of a fan; based on the first preset curve and the inter-cooling temperature lower limit value, the ignition angle and the EGR rate of the engine are adjusted to be a first ignition angle and a first EGR rate correspondingly, the engine is controlled to operate at the first ignition angle and the first EGR rate so that the engine can operate at the lowest gas consumption, and the step of obtaining the working condition parameters of the engine is returned; therefore, the combustion efficiency of the engine can be improved, and the economical efficiency is good.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a control method, device, equipment and medium for a natural gas engine. Background Art

[0002] In the related art, in order to save engine accessory work, the threshold of the engine's intercooler temperature is generally adjusted based on the upper threshold. That is to say, when the engine's intercooler temperature is higher than the upper threshold, the fan speed is adjusted to increase to cool the engine. When the engine's intercooler temperature is lower than the upper threshold, the fan speed is adjusted to decrease so that the engine's intercooler temperature is maintained near the upper threshold. While meeting the engine's heat dissipation requirements, the fan speed is low, reducing the engine's accessory work. However, the problem with this is that since the engine's intercooler temperature is maintained at the upper threshold, the engine's combustion efficiency is relatively low and the economy is poor. Summary of the invention

[0003] The present invention provides a control method, device, equipment and medium for a natural gas engine to improve the combustion efficiency and economy of the engine.

[0004] According to a first aspect of the present invention, there is provided a method for controlling a natural gas engine, comprising:

[0005] Acquiring engine operating parameters, and determining an optimal range of the engine intercooler temperature according to the operating conditions corresponding to the operating parameters;

[0006] When the engine does not experience knock, the intercooling temperature of the engine is adjusted to the lower limit of the intercooling temperature corresponding to the optimal intercooling temperature range by controlling the speed of the fan;

[0007] Based on the first preset curve and the lower limit value of the intercooler temperature, the ignition angle and the EGR rate of the engine are adjusted to the first ignition angle and the first EGR rate respectively, and the engine is controlled to operate at the first ignition angle and the first EGR rate so that the engine operates with the lowest gas consumption, and returns to the step of obtaining the operating parameters of the engine; wherein the first preset curve is a correspondence curve between the intercooler temperature, the ignition angle, the EGR rate and the gas consumption.

[0008] Optionally, adjusting the intercooling temperature of the engine to the lower limit of the intercooling temperature corresponding to the optimal intercooling temperature range by controlling the rotation speed of the fan includes:

[0009] When the intercooler temperature of the engine is greater than the intercooler temperature upper limit value corresponding to the intercooler temperature optimal interval range, the fan speed is controlled to increase, and when the intercooler temperature of the engine is less than or equal to the intercooler temperature upper limit value, the fan speed is continuously controlled to increase until the intercooler temperature of the engine is adjusted to the intercooler temperature lower limit value;

[0010] When the intercooler temperature of the engine is less than the lower limit of the intercooler temperature, the fan speed is controlled to decrease until the intercooler temperature of the engine is adjusted to the lower limit of the intercooler temperature.

[0011] Optionally, before adjusting the intercooling temperature of the engine to the lower limit of the intercooling temperature corresponding to the optimal intercooling temperature interval by controlling the rotation speed of the fan, the method further includes:

[0012] Acquiring a knock parameter of the engine, and determining whether a knock condition occurs in the engine based on the knock parameter;

[0013] When a knock condition occurs in the engine, if the knock parameter exceeds a knock limit threshold, the engine is controlled to reduce torque; if the knock parameter does not exceed the knock limit threshold, the ignition angle of the engine is adjusted to be delayed, and the EGR rate of the engine is adjusted to be increased, and the process returns to the step of obtaining the knock parameter of the engine;

[0014] When the engine does not experience a knock condition, a step of adjusting the intercooling temperature of the engine to an intercooling temperature lower limit value corresponding to the intercooling temperature optimal range by controlling the rotation speed of the fan is performed.

[0015] Optionally, obtaining an operating parameter of the engine, and determining an optimal range of the engine intercooler temperature according to the operating condition corresponding to the operating parameter includes:

[0016] The optimal range of the intercooler temperature of the engine is determined based on a second preset curve and the engine operating condition corresponding to the operating condition parameter, wherein the second preset curve is a corresponding relationship curve between the operating condition parameter and the optimal range of the intercooler temperature.

[0017] According to a second aspect of the present invention, there is provided a control device for a natural gas engine, comprising:

[0018] An interval range determination module, used to obtain the operating parameters of the engine, and determine the optimal interval range of the engine intercooler temperature according to the operating conditions corresponding to the operating parameters;

[0019] An intercooler temperature adjustment module, used for adjusting the intercooler temperature of the engine to the lower limit of the intercooler temperature corresponding to the optimal range of the intercooler temperature by controlling the speed of the fan when no detonation or misfire occurs in the engine;

[0020] An operating parameter adjustment module is used to adjust the ignition angle and EGR rate of the engine to be a first ignition angle and a first EGR rate respectively based on a first preset curve and a lower limit value of the intercooler temperature, and control the engine to operate at the first ignition angle and the first EGR rate so that the engine operates with the lowest gas consumption, and return to the step of obtaining the operating parameters of the engine; wherein the first preset curve is a corresponding relationship curve between the intercooler temperature, the ignition angle, the EGR rate and the gas consumption.

[0021] Optionally, the intercooler temperature adjustment module comprises:

[0022] A first adjustment unit, configured to control the fan speed to increase when the intercooler temperature of the engine is greater than an upper limit value of the intercooler temperature corresponding to the optimal interval range of the intercooler temperature, and to continue to control the fan speed to increase when the intercooler temperature of the engine is less than or equal to the upper limit value of the intercooler temperature until the intercooler temperature of the engine is adjusted to the lower limit value of the intercooler temperature;

[0023] The second adjustment unit is used for controlling the fan speed to decrease when the intercooler temperature of the engine is less than the lower limit of the intercooler temperature, until the intercooler temperature of the engine is adjusted to the lower limit of the intercooler temperature.

[0024] Optionally, it also includes:

[0025] a knock determination module, configured to obtain knock parameters of the engine, and determine whether a knock condition occurs in the engine based on the knock parameters;

[0026] a first knock unit, configured to, when a knock condition occurs in the engine, control the engine to reduce torque if the knock parameter exceeds a knock limit threshold, and adjust the ignition angle of the engine to be delayed and the EGR rate of the engine to be increased if the knock parameter does not exceed the knock limit threshold, and return to the step of obtaining the knock parameter of the engine;

[0027] The second detonation unit is used to execute the step of adjusting the intercooling temperature of the engine to the lower limit value of the intercooling temperature corresponding to the optimal range of the intercooling temperature by controlling the rotation speed of the fan when the engine does not have a detonation condition.

[0028] Optionally, the interval range determination module includes:

[0029] The interval range determination unit is used to determine the optimal interval range of the engine intercooler temperature based on a second preset curve and the engine operating condition corresponding to the operating condition parameter, wherein the second preset curve is a correspondence curve between the operating condition parameter and the optimal interval range of the intercooler temperature.

[0030] According to a third aspect of the present invention, an electronic device is provided, the electronic device comprising:

[0031] at least one processor; and

[0032] a memory communicatively connected to the at least one processor; wherein,

[0033] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the control method of the natural gas engine described in any embodiment of the present invention.

[0034] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions for enabling a processor to implement the control method for a natural gas engine according to any embodiment of the present invention when the computer instructions are executed.

[0035] According to the control method, device, equipment and medium of the natural gas engine provided by the embodiment of the present invention, the method includes: obtaining the working condition parameters of the engine, determining the optimal range of the intercooler temperature of the engine according to the working condition corresponding to the working condition parameters; when the engine does not have knock, by controlling the speed of the fan, adjusting the intercooler temperature of the engine to the lower limit of the intercooler temperature corresponding to the optimal range of the intercooler temperature; based on the first preset curve and the lower limit of the intercooler temperature, adjusting the ignition angle and EGR rate of the engine to the first ignition angle and the first EGR rate respectively, and controlling the engine to run at the first ignition angle and the first EGR rate, so that the engine runs with the lowest gas consumption, and returning to the step of obtaining the working condition parameters of the engine; wherein the first preset curve is a corresponding relationship curve between the intercooler temperature, the ignition angle, the EGR rate and the gas consumption. Thus, when the engine does not have knock, the intercooler temperature of the engine is maintained at the lower limit of the intercooler temperature, the ignition angle of the engine can be advanced, and the EGR rate can be reduced, the combustion efficiency of the engine can be improved, and the economy is good.

[0036] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0038] Figure 1 It is a structural schematic diagram of a natural gas engine in the related art;

[0039] Figure 2 is a flow chart of a control method for a natural gas engine provided by an embodiment of the present invention;

[0040] Figure 3 is a flow chart of a control method for a natural gas engine proposed in a specific embodiment of the present invention;

[0041] Figure 4 is a block diagram of a control device for a natural gas engine provided by an embodiment of the present invention;

[0042] Figure 5 It is a structural schematic diagram of an electronic device for implementing the control method of a natural gas engine according to an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme 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 described embodiments 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 creative work should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the specification 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 data 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 that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] Figure 1 It is a schematic diagram of the structure of a natural gas engine in the related technology. Figure 1As shown, the natural gas engine includes: a natural gas intake pipeline 001, an air intake pipeline 002, a mixer 003, an intake pipeline 004, a combustion chamber 005, an exhaust pipeline 006 and an exhaust gas recovery pipeline 007, wherein natural gas enters through the natural gas intake pipeline 001, and air enters through the air intake pipeline 002, and after being mixed in a certain proportion by the mixer 003, enters the combustion chamber 005 through the intake pipeline 004, and after being burned in the combustion chamber 005, the exhaust gas is discharged through the exhaust pipeline 006, part of the exhaust gas is mixed with the air again through the exhaust gas recovery pipeline 007, and part of the exhaust gas is processed and discharged by the post-processor.

[0046] Among them, when part of the exhaust gas is mixed with the air again through the exhaust gas recovery pipeline 007, the part of the exhaust gas is cooled by the intercooler, and the cooled exhaust gas and air mixture is mixed with natural gas again before entering the combustion chamber 005. This can increase the EGR rate (the ratio of the amount of recirculated exhaust gas to the total amount of intake air sucked into the cylinder). However, the temperature of the intercooler will increase. When the temperature of the intercooler rises to a certain temperature, a fault will occur. The temperature of the intercooler can be monitored and the intercooler can be cooled when the intercooler is overheated. The traditional thermal management of natural gas engines controls the water temperature and the intercooler temperature to an upper limit. Only when the water temperature and the intercooler temperature reach the upper limit temperature, the fan speed will no longer increase, so as to save engine accessory work.

[0047] Figure 2 FIG. 1 is a flow chart of a control method for a natural gas engine according to an embodiment of the present invention. Figure 2 As shown, the control method of the natural gas engine includes:

[0048] S101, obtaining engine operating parameters, and determining an optimal range of the engine intercooler temperature according to the operating conditions corresponding to the operating parameters.

[0049] Among them, the operating conditions of the engine generally include starting conditions, idling conditions, small load conditions, medium load conditions, large load conditions, full load conditions and acceleration conditions. These conditions can be determined by corresponding operating condition parameters. For example, in the starting condition, it can be determined by vehicle speed, pedal opening, etc. For example, in the idling condition, it can be determined by pedal opening. Small and medium load conditions can be determined by required torque, etc., and acceleration conditions can be determined by vehicle speed. Operating condition parameters generally include vehicle speed, required torque, pedal opening, actual torque, ambient temperature or ambient pressure, etc. The corresponding operating condition can be determined by one or more of the operating condition parameters.

[0050] Since the heat dissipation of the engine in each working condition is different, the required cooling capacity of the intercooler is different, and thus the optimal range of the intercooler working temperature is also different. In the calibration stage, the optimal range of the intercooler working temperature can be calibrated according to different working conditions. In actual use, when the corresponding working condition is detected, the optimal range of the engine's intercooler temperature can be obtained.

[0051] S102, when no knock occurs in the engine, adjusting the engine intercooler temperature to the lower limit of the intercooler temperature corresponding to the optimal range of the intercooler temperature by controlling the speed of the fan.

[0052] When the engine knocks, it means that the engine ignition angle can no longer be advanced, and the ignition angle needs to be delayed to alleviate the engine knock. When the engine intercooler temperature is adjusted to the lower limit of the intercooler temperature, the ignition angle will generally be advanced. Therefore, when the engine does not knock, the embodiment of the present invention means that the engine ignition angle still has a certain margin for advancement. At this time, the engine intercooler temperature is adjusted to the lower limit of the intercooler temperature corresponding to the optimal range of the intercooler temperature to utilize the margin of the engine ignition angle that can be advanced.

[0053] It is to be understood that the above-mentioned detonation may be detonation or misfire.

[0054] S103, based on the first preset curve and the lower limit value of the intercooler temperature, adjust the ignition angle and EGR rate of the engine to the first ignition angle and the first EGR rate respectively, and control the engine to operate at the first ignition angle and the first EGR rate so that the engine operates with the lowest gas consumption, and return to the step of obtaining the operating parameters of the engine; wherein the first preset curve is a correspondence curve between the intercooler temperature, the ignition angle, the EGR rate and the gas consumption.

[0055] It is understandable that the first preset curve can be calibrated in advance, and when the intercooler temperature of the engine is adjusted to the lower limit of the intercooler temperature, the ignition angle and EGR rate of the engine can be adjusted accordingly, and the adjusted first ignition angle and first EGR rate can better match the current lower limit of the intercooler temperature, so that the gas consumption of the engine is in the best economic zone. For example, the ignition angle of the engine is adjusted in advance, and the EGR rate is reduced, so that the combustion efficiency of the engine can be improved, and the economy of the engine is good.

[0056] Optionally, adjusting the intercooler temperature of the engine to the lower limit of the intercooler temperature corresponding to the optimal range of the intercooler temperature by controlling the speed of the fan includes:

[0057] When the intercooler temperature of the engine is greater than the upper limit of the intercooler temperature corresponding to the optimal range of the intercooler temperature, the fan speed is controlled to increase, and when the intercooler temperature of the engine is less than or equal to the upper limit of the intercooler temperature, the fan speed is continued to be controlled to increase until the intercooler temperature of the engine is adjusted to the lower limit of the intercooler temperature;

[0058] When the intercooler temperature of the engine is lower than the lower limit of the intercooler temperature, the fan speed is controlled to decrease until the intercooler temperature of the engine is adjusted to the lower limit of the intercooler temperature.

[0059] It should be noted that when the engine intercooler temperature is within the optimal range of the intercooler temperature, the fan speed can be controlled to increase so that the engine intercooler temperature continues to decrease and drops to the lower limit of the intercooler temperature; when the engine intercooler temperature is not within the optimal range of the intercooler temperature, the engine intercooler temperature can be closed-loop regulated by controlling the fan speed. For example, when the engine intercooler temperature is greater than the upper limit of the intercooler temperature corresponding to the optimal range of the intercooler temperature, the fan speed is controlled to increase; when the engine intercooler temperature is less than the lower limit of the intercooler temperature, the fan speed is controlled to decrease.

[0060] During the adjustment process, the engine intercooler temperature can be obtained in real time through a temperature sensor, and the fan speed can be obtained through a speed sensor to form a closed-loop regulation.

[0061] Optionally, before adjusting the intercooling temperature of the engine to the lower limit of the intercooling temperature corresponding to the optimal interval range of the intercooling temperature by controlling the rotation speed of the fan, the method further includes:

[0062] Obtaining knock parameters of the engine, and determining whether a knock condition occurs in the engine based on the knock parameters;

[0063] When the engine knocks, if the knock parameter exceeds the knock limit threshold, the engine is controlled to reduce torque; if the knock parameter does not exceed the knock limit threshold, the engine ignition angle is adjusted to be delayed, and the engine EGR rate is adjusted to be increased, and the process returns to the step of obtaining the engine knock parameter;

[0064] When the engine does not experience knock, the step of adjusting the engine intercooler temperature to the lower limit of the intercooler temperature corresponding to the optimal range of the intercooler temperature by controlling the speed of the fan is performed.

[0065] Among them, the knock parameter can be a voltage or current signal related to the knock intensity. When the knock parameter exceeds the normal threshold, it can be determined that the engine has a knock condition. When the knock parameter does not exceed the normal threshold, it can be determined that the engine has not a knock condition. Furthermore, under the premise that the engine has not a knock condition, the intercooler temperature can be adjusted to the lower limit of the intercooler temperature to utilize the engine's ignition angle margin. When the engine has a knock condition, the severity of the guaranteed condition is determined. If the severity of the knock condition exceeds the knock limit, the engine needs to be torque-reduced. If the severity of the knock condition does not exceed the knock limit, the degree of knock can be alleviated by delaying the ignition angle and increasing the EGR rate.

[0066] Optionally, obtaining the operating parameters of the engine, and determining the optimal range of the engine intercooler temperature according to the operating parameters includes:

[0067] The optimal range of the engine intercooler temperature is determined based on the second preset curve and the engine operating condition corresponding to the operating condition parameter. The second preset curve is a corresponding relationship curve between the operating condition parameter and the optimal range of the engine intercooler temperature.

[0068] Among them, the second preset curve can be calibrated in advance, and different working conditions correspond to different working condition parameters. By collecting the working condition parameters in advance, the working condition category of the engine can be obtained, and the heat dissipation of the engine corresponding to different working conditions is different, and thus the optimal range of the engine intercooler temperature is different. By calibrating the second preset curve in advance, after detecting the corresponding working condition, the corresponding optimal range of the intercooler temperature can be queried according to the second preset curve. Then, the actual intercooler temperature detected by the temperature sensor can be used to perform closed-loop adjustment on the engine intercooler temperature.

[0069] Figure 3 FIG. 1 is a flow chart of a control method for a natural gas engine according to a specific embodiment of the present invention. Figure 3 As shown, the control method includes:

[0070] S201, start collecting working condition parameters;

[0071] S202, determining whether the engine has knock; if so, executing S203, if not, executing S206;

[0072] S203, determining whether the knock condition exceeds a severe threshold, if so, executing S204, if not, executing S205;

[0073] S204, controlling the engine to reduce torque, and returning to S201;

[0074] S205, delaying the ignition angle, increasing the EGR rate, and returning to S201;

[0075] S206, determining the engine operating condition according to the operating condition parameters, and determining the optimal range of the intercooler temperature;

[0076] S207, determining whether the intercooler temperature of the engine is within the optimal intercooler temperature range, if so, executing S208, if not, executing S209;

[0077] S208, controlling the fan speed to increase, and adjusting the intercooler temperature of the engine to the lower limit of the intercooler temperature;

[0078] S209, controlling the fan speed to change, adjusting the intercooler temperature of the engine to the optimal intercooler temperature range, and returning to S208;

[0079] S210, determining whether the engine ignition angle and EGR rate match the current lower limit of the intercooler temperature, if so, returning to S201, if not, executing S211;

[0080] S211, adjust the engine's ignition angle to the first ignition angle and the EGR rate to the first EGR rate to match the current lower limit of the engine's intercooler temperature, so that the engine operates in the best economic zone (with the lowest gas consumption), and return to S201.

[0081] That is, the control method includes:

[0082] Step 1: ECU (Electronic Control Unit, on-board controller) signal acquisition. The ECU collects engine operating information, including actual engine torque, engine requested torque, driver pedal position, engine ignition angle and EGR rate, knock and misfire intensity real-time monitoring signals, and vehicle operating information including vehicle speed.

[0083] Step 2: Processing of signals related to the engine vehicle working condition. Pre-process the signals collected in step 1 to determine whether the engine has knock or misfire at this time. If misfire or knock occurs, execute step 2-a. If no misfire or knock occurs, execute step 3.

[0084] Step 2-a: Compare the knock and misfire degree signals collected in step 2 with the severity threshold, and if they exceed the severity threshold, execute step 2-ai. If they do not exceed the severity threshold, execute step 2-a-ii.

[0085] Step 2-ai: The engine performs torque reduction related to knock and misfire.

[0086] Step 2-a-ii: Although the engine has knock and misfire at this time, the degree is acceptable. The knock and misfire can be alleviated by actively adjusting the EGR and ignition angle.

[0087] Step 3: In this step, the vehicle information is mainly collected and processed. The ECU or VCU (Vehicle Control Unit) collects information such as vehicle speed, ambient temperature, ambient pressure, etc.

[0088] Step 4: Based on the vehicle information collected in step 3, optimize the vehicle thermal management, mainly to determine whether the intercooler temperature is in the optimal range. If the intercooler temperature is too high or too low, execute step 4-a; if the intercooler temperature is in the optimal range, execute step 4-b.

[0089] Step 4-a: Based on the actual intercooler temperature and the optimal range, the fan speed is closed-loop controlled so that the intercooler temperature eventually reaches the optimal range and the lower limit of the intercooler temperature.

[0090] Step 4-b: When the intercooler temperature is adjusted to the lower limit of the intercooler temperature, determine the optimal EGR rate and ignition angle based on the vehicle and engine operating conditions at this time. If the EGR rate and ignition angle are not in the optimal range, execute step 5. If the EGR rate and ignition angle are already in the optimal range, return to step 2 and start determining the knock and misfire intensity.

[0091] Step 5: Adjust the ignition angle and EGR valve so that the EGR rate and ignition angle are in the optimal economic range.

[0092] Therefore, the embodiment of the present invention takes into account the thermal management of the whole vehicle and the combustion control in a coordinated manner, and is not limited to controlling the cooling module of the whole vehicle and the temperature of the engine. The thermal management strategy of the natural gas whole vehicle cooperates with the combustion control of the engine to further optimize the combustion efficiency and economy of the engine. The present invention does not control the upper limit of the water temperature with the goal of saving accessory work. Instead, it increases the fan speed and controls the water temperature and the intercooler temperature to a lower level under the premise of meeting the knock safety to reach the lower limit of the water temperature. Thereby improving the engine's anti-knock performance and allowing an ignition angle and EGR rate with better combustion efficiency under low temperature conditions. Thereby improving the engine's thermal efficiency and saving gas consumption. The total account is more energy-efficient. And the entire process can be adaptively adjusted, with a high degree of automation.

[0093] Figure 4 FIG. 1 is a block diagram of a control device for a natural gas engine according to an embodiment of the present invention. Figure 4 As shown, the control device includes:

[0094] The interval range determination module 101 is used to obtain the operating parameters of the engine and determine the optimal interval range of the engine intercooler temperature according to the operating parameters;

[0095] The intercooler temperature adjustment module 102 is used to adjust the intercooler temperature of the engine to the lower limit of the intercooler temperature corresponding to the optimal range of the intercooler temperature by controlling the speed of the fan when no knock or misfire occurs in the engine;

[0096] The operating parameter adjustment module 103 is used to adjust the ignition angle and EGR rate of the engine to the first ignition angle and the first EGR rate respectively based on the first preset curve and the lower limit value of the intercooler temperature, and control the engine to operate at the first ignition angle and the first EGR rate so that the engine operates with the lowest gas consumption, and return to the step of obtaining the operating parameters of the engine; wherein the first preset curve is a correspondence curve between the intercooler temperature, the ignition angle, the EGR rate and the gas consumption.

[0097] Optionally, the intercooler temperature adjustment module comprises:

[0098] The first adjustment unit is used to control the fan speed to increase when the intercooler temperature of the engine is greater than the intercooler temperature upper limit value corresponding to the intercooler temperature optimal interval range, and when the intercooler temperature of the engine is less than or equal to the intercooler temperature upper limit value, continue to control the fan speed to increase until the intercooler temperature of the engine is adjusted to the intercooler temperature lower limit value;

[0099] The second adjustment unit is used for controlling the fan speed to decrease when the intercooler temperature of the engine is less than the lower limit of the intercooler temperature, until the intercooler temperature of the engine is adjusted to the lower limit of the intercooler temperature.

[0100] Optionally, it also includes:

[0101] A knock determination module is used to obtain knock parameters of the engine and determine whether a knock condition occurs in the engine based on the knock parameters;

[0102] A first knock unit is used for, when a knock condition occurs in the engine, if the knock parameter exceeds the knock limit threshold, controlling the engine to reduce torque, and if the knock parameter does not exceed the knock limit threshold, adjusting the engine ignition angle delay, adjusting the engine EGR rate increase, and returning to the step of obtaining the engine knock parameter;

[0103] The second detonation unit is used to execute the step of adjusting the intercooling temperature of the engine to the lower limit value of the intercooling temperature corresponding to the optimal range of the intercooling temperature by controlling the speed of the fan when the engine does not have a detonation condition.

[0104] Optionally, the interval range determination module includes:

[0105] The interval range determination unit is used to determine the optimal interval range of the engine intercooler temperature based on the second preset curve and the engine operating condition corresponding to the operating condition parameter. The second preset curve is a correspondence curve between the operating condition parameter and the optimal interval range of the intercooler temperature.

[0106] Specifically, the ECU collects engine operating information, including actual engine torque, engine requested torque, driver pedal position, engine ignition angle, engine EGR rate, vehicle fan speed, knock intensity real-time monitoring signal, and vehicle operating information. The information collected by the ECU and processed by the engine signal processing module is input into the vehicle thermal management control module. The thermal management module determines whether the vehicle intercooler temperature is within the optimal temperature range, thereby adjusting the fan speed and performing closed-loop control of the intercooler temperature.

[0107] At the same time, the combustion control module optimizes the real-time combustion control based on the feedback from the vehicle thermal management module. It provides fan speed, reduces the intercooler temperature and coolant temperature, adjusts the ignition angle and EGR rate, and uses the knock signal as the adjustment boundary to keep the gas consumption of the vehicle's natural gas engine in the optimal range at all times.

[0108] In addition, protection modules are designed for the knock and misfire phenomena of natural gas engines: First, the knock protection module. If the knock intensity is detected to be greater than the safety limit during the switching process, knock protection is immediately performed. By adjusting the ignition angle, adjusting the EGR rate, and reducing the engine torque, the knock intensity is restored to normal values; Second, the misfire protection module. If the misfire degree is detected to be greater than the safety limit during the switching process, misfire protection is immediately performed. By adjusting the ignition angle, adjusting the EGR rate, and reducing the engine torque, the misfire degree is restored to normal values.

[0109] The control device of the natural gas engine provided in the embodiment of the present invention can execute the control method of the natural gas engine provided in any embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. The present invention does not control the upper limit of the water temperature with the goal of saving accessory power. Instead, it increases the fan speed, and controls the water temperature and intercooler temperature to a lower level under the premise of meeting the detonation safety, to reach the lower limit of the water temperature. Thereby improving the engine's anti-knock performance, allowing for an ignition angle and EGR rate with better combustion efficiency under low temperature conditions. Furthermore, the engine's thermal efficiency is improved, saving gas consumption. In total, it is more energy-efficient. And the entire process can be adaptively adjusted, with a high degree of automation.

[0110] According to the electronic device proposed by the present invention, the electronic device includes:

[0111] at least one processor; and

[0112] a memory communicatively connected to the at least one processor; wherein,

[0113] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the control method of the natural gas engine described in any embodiment of the present invention.

[0114] Figure 5 A schematic diagram of the structure of an electronic device 10 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0115] like Figure 5 As shown, the electronic device 10 includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the random access memory (RAM) 13, various programs and data required for the operation of the electronic device 10 can also be stored. The processor 11, the read-only memory (ROM) 12 and the random access memory (RAM) 13 are connected to each other through a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0116] A number of components in the electronic device 10 are connected to an input / output (I / O) interface 15, including an input unit 16, such as a keyboard, a mouse, etc., an output unit 17, such as various types of displays, speakers, etc., a storage unit 18, such as a disk, an optical disk, etc., and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0117] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a control method for a natural gas engine.

[0118] In some embodiments, the control method of the natural gas engine can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via a read-only memory (ROM) 12 and / or a communication unit 19. When the computer program is loaded into a random access memory (RAM) 13 and executed by the processor 11, one or more steps of the control method of the natural gas engine described above can be performed. Alternatively, in other embodiments, the processor 11 can be configured to execute the control method of the natural gas engine in any other appropriate manner (for example, by means of firmware).

[0119] Various implementations of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various implementations can include: being implemented in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0120] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0121] According to the computer-readable storage medium proposed by the present invention, the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the control method of the natural gas engine described in any embodiment of the present invention when executing the computer instructions.

[0122] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, device, or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0123] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0124] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0125] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0126] According to the control method, device, equipment and medium of the natural gas engine provided by the embodiment of the present invention, the method includes: obtaining the working condition parameters of the engine, determining the optimal range of the intercooler temperature of the engine according to the working condition corresponding to the working condition parameters; when the engine does not have knock, by controlling the speed of the fan, adjusting the intercooler temperature of the engine to the lower limit of the intercooler temperature corresponding to the optimal range of the intercooler temperature; based on the first preset curve and the lower limit of the intercooler temperature, adjusting the ignition angle and EGR rate of the engine to the first ignition angle and the first EGR rate respectively, and controlling the engine to run at the first ignition angle and the first EGR rate, so that the engine runs with the lowest gas consumption, and returning to the step of obtaining the working condition parameters of the engine; wherein the first preset curve is a corresponding relationship curve between the intercooler temperature, the ignition angle, the EGR rate and the gas consumption. Thus, when the engine does not have knock, the intercooler temperature of the engine is maintained at the lower limit of the intercooler temperature, the ignition angle of the engine can be advanced, and the EGR rate can be reduced, the combustion efficiency of the engine can be improved, and the economy is good.

[0127] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0128] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for controlling a natural gas engine, characterized in that: include: Acquiring engine operating parameters, and determining an optimal range of the engine intercooler temperature according to the operating conditions corresponding to the operating parameters; When the engine does not experience knock, the intercooling temperature of the engine is adjusted to the lower limit of the intercooling temperature corresponding to the optimal intercooling temperature range by controlling the speed of the fan; Based on the first preset curve and the lower limit value of the intercooler temperature, the ignition angle and the EGR rate of the engine are adjusted to the first ignition angle and the first EGR rate respectively, and the engine is controlled to operate at the first ignition angle and the first EGR rate so that the engine operates with the lowest gas consumption, and returns to the step of obtaining the operating parameters of the engine; wherein the first preset curve is a correspondence curve between the intercooler temperature, the ignition angle, the EGR rate and the gas consumption.

2. The control method of the natural gas engine according to claim 1, characterized in that: Adjusting the intercooling temperature of the engine to the lower limit of the intercooling temperature corresponding to the optimal intercooling temperature range by controlling the speed of the fan includes: When the intercooler temperature of the engine is greater than the intercooler temperature upper limit value corresponding to the intercooler temperature optimal interval range, the fan speed is controlled to increase, and when the intercooler temperature of the engine is less than or equal to the intercooler temperature upper limit value, the fan speed is continuously controlled to increase until the intercooler temperature of the engine is adjusted to the intercooler temperature lower limit value; When the intercooler temperature of the engine is less than the lower limit of the intercooler temperature, the fan speed is controlled to decrease until the intercooler temperature of the engine is adjusted to the lower limit of the intercooler temperature.

3. The control method of the natural gas engine according to claim 1, characterized in that: Before adjusting the intercooling temperature of the engine to the lower limit of the intercooling temperature corresponding to the optimal intercooling temperature range by controlling the rotation speed of the fan, the method further includes: Acquiring a knock parameter of the engine, and determining whether a knock condition occurs in the engine based on the knock parameter; When a knock condition occurs in the engine, if the knock parameter exceeds a knock limit threshold, the engine is controlled to reduce torque; if the knock parameter does not exceed the knock limit threshold, the ignition angle of the engine is adjusted to be delayed, and the EGR rate of the engine is adjusted to be increased, and the process returns to the step of obtaining the knock parameter of the engine; When the engine does not experience a knock condition, a step of adjusting the intercooling temperature of the engine to an intercooling temperature lower limit value corresponding to the intercooling temperature optimal range by controlling the rotation speed of the fan is performed.

4. The control method of the natural gas engine according to claim 1, characterized in that: Obtaining the operating parameters of the engine, and determining the optimal range of the engine intercooler temperature according to the operating conditions corresponding to the operating parameters includes: The optimal range of the intercooler temperature of the engine is determined based on a second preset curve and the engine operating condition corresponding to the operating condition parameter, wherein the second preset curve is a corresponding relationship curve between the operating condition and the optimal range of the intercooler temperature.

5. A control device for a natural gas engine, characterized in that: include: An interval range determination module, used to obtain the operating parameters of the engine, and determine the optimal interval range of the engine intercooler temperature according to the operating conditions corresponding to the operating parameters; An intercooler temperature adjustment module, used for adjusting the intercooler temperature of the engine to the lower limit of the intercooler temperature corresponding to the optimal range of the intercooler temperature by controlling the speed of the fan when no detonation or misfire occurs in the engine; An operating parameter adjustment module is used to adjust the ignition angle and EGR rate of the engine to be a first ignition angle and a first EGR rate respectively based on a first preset curve and a lower limit value of the intercooler temperature, and control the engine to operate at the first ignition angle and the first EGR rate so that the engine operates with the lowest gas consumption, and return to the step of obtaining the operating parameters of the engine; wherein the first preset curve is a corresponding relationship curve between the intercooler temperature, the ignition angle, the EGR rate and the gas consumption.

6. The control device for the natural gas engine according to claim 5, characterized in that: Intercooler temperature adjustment module, including: A first adjustment unit, configured to control the fan speed to increase when the intercooler temperature of the engine is greater than an upper limit value of the intercooler temperature corresponding to the optimal interval range of the intercooler temperature, and to continue to control the fan speed to increase when the intercooler temperature of the engine is less than or equal to the upper limit value of the intercooler temperature until the intercooler temperature of the engine is adjusted to the lower limit value of the intercooler temperature; The second adjustment unit is used for controlling the fan speed to decrease when the intercooler temperature of the engine is less than the lower limit of the intercooler temperature, until the intercooler temperature of the engine is adjusted to the lower limit of the intercooler temperature.

7. The control device for a natural gas engine according to claim 5, characterized in that: Also includes: a knock determination module, configured to obtain knock parameters of the engine, and determine whether a knock condition occurs in the engine based on the knock parameters; a first knock unit, configured to, when a knock condition occurs in the engine, control the engine to reduce torque if the knock parameter exceeds a knock limit threshold, and adjust the ignition angle of the engine to be delayed and the EGR rate of the engine to be increased if the knock parameter does not exceed the knock limit threshold, and return to the step of obtaining the knock parameter of the engine; The second detonation unit is used to execute the step of adjusting the intercooling temperature of the engine to the lower limit value of the intercooling temperature corresponding to the optimal range of the intercooling temperature by controlling the rotation speed of the fan when the engine does not have a detonation condition.

8. The control device for a natural gas engine according to claim 5, characterized in that: The interval range determination module includes: The interval range determination unit is used to determine the optimal interval range of the engine intercooler temperature based on a second preset curve and the engine operating condition corresponding to the operating condition parameter, wherein the second preset curve is a correspondence curve between the operating condition parameter and the optimal interval range of the intercooler temperature.

9. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the control method of the natural gas engine according to any one of claims 1 to 4.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the control method of the natural gas engine according to any one of claims 1 to 4 when executed.

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