Method and device for controlling concentration of fuel gas in crankcase, vehicle and storage medium

Abstract

The invention discloses a control method for the concentration of fuel gas in a crankcase, a control device for the concentration of fuel gas in the crankcase, a vehicle and a computer storage medium, the control method for the concentration of fuel gas in the crankcase is applied to the vehicle, and the control method for the concentration of fuel gas in the crankcase comprises the steps that the current operation working condition of an engine and the concentration of hydrogen in the crankcase are obtained; adjusting the rotating speed of the centrifugal oil-gas separator according to the operation condition; when the hydrogen concentration increases, a first step is performed, where the first step includes reducing the torque of the engine. According to the method for controlling the concentration of the fuel gas in the crankcase, the volume concentration of the hydrogen in the crankcase can be kept at a low level.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel gas concentration control, and in particular to a method for controlling fuel gas concentration in a crankcase, a device for controlling fuel gas concentration in a crankcase, a vehicle and a computer storage medium. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] Hydrogen has high diffusivity and permeability. After the engine has been running for a long time, the volume concentration of hydrogen in the crankcase is difficult to maintain at a low level, which can easily lead to safety risks.

[0004] Therefore, how to keep the volume concentration of hydrogen in the crankcase at a low level is an important research direction. Summary of the invention

[0005] The object of the present invention is to at least solve the problem of how to keep the volume concentration of hydrogen in the crankcase at a low level. This object is achieved by the following technical solutions:

[0006] A first aspect of the present invention proposes a method for controlling the concentration of fuel gas in a crankcase, which is applied to a vehicle. The vehicle includes an engine, a centrifugal oil-gas separator and a venturi tube. The engine includes a crankcase and a combustion chamber. The blowby gas outlet of the combustion chamber is connected to the blowby gas inlet of the crankcase, the gas outlet of the crankcase is connected to the gas inlet of the centrifugal oil-gas separator, the outlet of the centrifugal oil-gas separator is connected to the inlet of the combustion chamber, the venturi tube includes an inlet and an outlet, the outlet is connected to the crankcase, and the inlet is suitable for introducing positive pressure gas. The method for controlling the concentration of fuel gas in the crankcase includes: obtaining the current operating conditions of the engine and the hydrogen concentration in the crankcase; adjusting the rotation speed of the centrifugal oil-gas separator according to the operating conditions; and executing the first step when the hydrogen concentration increases, wherein the first step includes: reducing the torque of the engine.

[0007] The method for controlling the concentration of gas in the crankcase of the embodiment of the present invention is connected to the blow-by gas inlet of the crankcase through the blow-by gas outlet of the combustion chamber, the gas outlet of the crankcase is connected to the gas inlet of the centrifugal oil-gas separator, and the gas outlet of the centrifugal oil-gas separator is connected to the gas inlet of the combustion chamber, so that the centrifugal oil-gas separator can extract the gas in the crankcase when working, so that the blow-by gas in the crankcase can be accelerated to leave the crankcase. By adjusting the speed of the centrifugal oil-gas separator according to the operating conditions, the hydrogen concentration in the crankcase can be corrected, so that the level of hydrogen concentration in the crankcase is maintained at a low state. In addition, by adjusting the speed of the centrifugal oil-gas separator according to the operating conditions, oil and gas can also be separated efficiently. When the concentration in the crankcase further increases, the torque of the engine is reduced to reduce the amount of blow-by gas from the combustion chamber to the crankcase, so that the hydrogen concentration in the crankcase can be further reduced, and the hydrogen concentration in the crankcase is maintained at a low level.

[0008] In some embodiments of the present invention, adjusting the rotation speed of the centrifugal oil-gas separator according to the operating conditions includes:

[0009] sending a regulating signal to the centrifugal oil-gas separator according to the operating condition and a preset table, wherein the preset table is preset, the preset table is used to characterize the relationship between the operating condition and the rotational speed of the centrifugal oil-gas separator, and the regulating signal is used to instruct the centrifugal oil-gas separator to adjust the rotational speed;

[0010] In response to receiving the adjustment signal, the centrifugal oil-gas separator adjusts the rotation speed according to the adjustment signal.

[0011] In some embodiments of the present invention, the first step further comprises: increasing the rotation speed of the centrifugal oil-gas separator.

[0012] In some embodiments of the present invention, when the hydrogen concentration increases, after executing the first step, the method for controlling the concentration of fuel gas in the crankcase further includes:

[0013] When the rotation speed of the centrifugal oil-gas separator is greater than or equal to a first threshold value and the hydrogen concentration in the crankcase increases, air is introduced into the crankcase through a venturi tube.

[0014] In some embodiments of the present invention, the method for controlling the concentration of fuel gas in the crankcase further includes:

[0015] In response to a vehicle start signal, obtaining a real-time hydrogen concentration in the crankcase;

[0016] comparing the real-time hydrogen concentration with a second threshold;

[0017] When the real-time hydrogen concentration is greater than or equal to a second threshold, the centrifugal oil-gas separator is started.

[0018] In some embodiments of the present invention, the method for controlling the concentration of fuel gas in the crankcase further includes:

[0019] In response to a stop signal, obtaining a real-time hydrogen concentration in the crankcase;

[0020] comparing the real-time hydrogen concentration with a third threshold;

[0021] When the real-time hydrogen concentration is greater than or equal to a third threshold, the centrifugal oil-gas separator operates with a delayed operation.

[0022] In some embodiments of the present invention, when the real-time hydrogen concentration is greater than or equal to the third threshold value, after the centrifugal oil-gas separator delays operation, the method for controlling the gas concentration in the crankcase further includes:

[0023] comparing the real-time hydrogen concentration with a fourth threshold;

[0024] When the real-time hydrogen concentration is less than a fourth threshold, the delayed operation of the centrifugal oil-gas separator is stopped.

[0025] A second aspect of the present invention provides a crankcase gas concentration control device, which is applied to a vehicle, wherein the vehicle comprises an engine, a centrifugal oil-gas separator and a venturi tube, the engine comprises a crankcase and a combustion chamber, the blow-by gas outlet of the combustion chamber is connected to the blow-by gas inlet of the crankcase, the gas outlet of the crankcase is connected to the gas inlet of the centrifugal oil-gas separator, the gas outlet of the centrifugal oil-gas separator is connected to the gas inlet of the combustion chamber, the venturi tube comprises an inlet and an outlet, the outlet is connected to the crankcase, the inlet is suitable for introducing positive pressure gas, and the crankcase gas concentration control device comprises:

[0026] An acquisition module, used to acquire the current operating condition of the engine and the hydrogen concentration in the crankcase;

[0027] A regulating module, used for regulating the rotation speed of the centrifugal oil-gas separator according to the operating conditions;

[0028] The execution module is used to execute a first step when the hydrogen concentration increases, wherein the first step includes: reducing the torque of the engine.

[0029] The third aspect of the present invention proposes a vehicle, which includes an engine, a centrifugal oil-gas separator, a venturi tube, a memory and a processor, the engine includes a crankcase and a combustion chamber, the blowby gas outlet of the combustion chamber is connected to the blowby gas inlet of the crankcase, the gas outlet of the crankcase is connected to the gas inlet of the centrifugal oil-gas separator, the air outlet of the centrifugal oil-gas separator is connected to the air inlet of the combustion chamber, the venturi tube includes an air inlet and an air outlet, the air outlet is connected to the crankcase, and the air inlet is suitable for passing positive pressure gas, the memory stores a computer program, the processor is connected to the engine, the centrifugal oil-gas separator and the venturi signal, and when the processor executes the computer program, the steps of the method for controlling the concentration of fuel gas in the crankcase as described in the first aspect above are implemented.

[0030] The fourth aspect of the present invention proposes a computer storage medium having computer-readable instructions stored thereon. When the computer-readable instructions are read by one or more processors, the one or more processors execute the steps of the crankcase gas concentration control method as described in the first aspect above. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0032] Figure 1 It is a flow chart of a method for controlling the concentration of fuel gas in a crankcase according to an embodiment of the present invention;

[0033] Figure 2 A schematic diagram of a gas path of a vehicle according to an embodiment of the present invention;

[0034] Figure 3 FIG. 4 is a schematic diagram of a vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0036] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0037] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0038] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0039] A hydrogen engine is an internal combustion engine that uses hydrogen as fuel. It generates power by burning hydrogen. Compared with traditional gasoline or diesel engines, the emissions of hydrogen engines are mainly water, which has less impact on the environment. Hydrogen engines have the characteristics of high calorific value, low ignition energy requirement, and fast flame propagation speed during the combustion process, so they have higher thermal efficiency and lower emissions in theory.

[0040] However, hydrogen engines face some technical challenges in terms of durability. Due to the high diffusivity and permeability of hydrogen, the volume concentration of hydrogen in the crankcase is difficult to maintain at a low level after the engine has been running for a long time, which can easily lead to safety problems such as hydrogen leakage and explosion.

[0041] Therefore, how to keep the volume concentration of hydrogen in the crankcase at a low level is an important research direction.

[0042] In order to at least solve the problem of how to keep the volume concentration of hydrogen in the crankcase at a low level, an embodiment of the present invention proposes a method for controlling the concentration of fuel gas in the crankcase, which can keep the volume concentration of hydrogen in the crankcase at a low level.

[0043] The following is a brief introduction to the relevant nouns:

[0044] Crankcase: The crankcase is a vital part of the engine. Its main functions include supporting the crankshaft, storing and circulating engine oil, and ventilating the crankcase. In other words, the crankcase not only supports the crankshaft, but is also responsible for the lubrication system, sealing system, and pressure regulation system.

[0045] Crankcase blowby: During the operation of a hydrogen engine, due to the loose seal between the piston ring and the cylinder, unburned mixed gas and exhaust gas may pass through the piston ring into the crankcase. Blowby contains unburned hydrogen, lubricating oil vapor, water vapor and exhaust gas, which can cause oil deterioration, engine parts corrosion, excessive crankcase pressure and other problems, and also increase oil consumption. Blowby can also cause hydrogen leakage, explosion and other safety issues.

[0046] Oil-gas separator: The main function of the oil-gas separator is to separate the engine oil from the gas discharged from the crankcase, reduce engine oil consumption and environmental pollution, and maintain the normal circulation and lubrication function of the engine oil.

[0047] Centrifugal oil and gas separator: Centrifugal oil and gas separator is a device that uses centrifugal force to separate oil and gas. The movement trajectories of oil droplets and gas under the action of centrifugal force are different, thus achieving the separation of oil and gas.

[0048] Venturi tube: Venturi tube is a device that uses the Venturi effect to generate negative pressure. The working principle of the Venturi tube is based on the continuity equation and Bernoulli's theorem in fluid mechanics, that is, when the fluid passes through a narrow part of the pipe, the flow rate increases, resulting in a decrease in pressure.

[0049] ECU (Electronic Control Unit): ECU is a key component in modern cars. ECU is responsible for controlling and managing multiple systems of the vehicle.

[0050] In the crankcase fuel gas concentration control method of the embodiment of the present invention, the fuel gas may be hydrogen or other combustible gases suitable as fuel. The following takes hydrogen as an example and describes the crankcase fuel gas concentration control method of the embodiment of the present invention in conjunction with the accompanying drawings.

[0051] like Figure 2 As shown, the method for controlling the concentration of fuel gas in a crankcase of an embodiment of the present invention is applied to a vehicle, wherein the vehicle comprises an engine, a centrifugal oil-gas separator and a venturi tube, the engine comprises a crankcase and a combustion chamber, the blowby gas outlet of the combustion chamber is connected to the blowby gas inlet of the crankcase, the gas outlet of the crankcase is connected to the gas inlet of the centrifugal oil-gas separator, the gas outlet of the centrifugal oil-gas separator is connected to the gas inlet of the combustion chamber, the venturi tube comprises an air inlet and an air outlet, the air outlet is connected to the crankcase, and the air inlet is suitable for introducing positive pressure gas.

[0052] The blow-by gas outlet of the combustion chamber is connected to the blow-by gas inlet of the crankcase, the gas outlet of the crankcase is connected to the gas inlet of the centrifugal oil-gas separator, and the gas outlet of the centrifugal oil-gas separator is connected to the gas inlet of the combustion chamber. After the blow-by gas of the combustion chamber enters the crankcase, it can return to the combustion chamber through the centrifugal oil-gas separator for combustion. When the centrifugal oil-gas separator is working, it can extract the gas in the crankcase, so that the blow-by gas in the crankcase can leave the crankcase faster. Air can be introduced into the crankcase through the venturi tube, thereby diluting the hydrogen concentration in the crankcase. In addition, the venturi tube can convert positive pressure gas into negative pressure gas, thereby accelerating the discharge of hydrogen in the crankcase, and further reducing the hydrogen concentration in the crankcase.

[0053] like Figure 1 As shown, the method for controlling the concentration of fuel gas in the crankcase includes:

[0054] S100, obtaining the current operating condition of the engine and the hydrogen concentration in the crankcase;

[0055] S200, adjusting the rotation speed of the centrifugal oil-gas separator according to the operating conditions;

[0056] S300: When the hydrogen concentration increases, execute the first step, wherein the first step includes: reducing the torque of the engine.

[0057] S100: Obtain the current operating condition of the engine and the hydrogen concentration in the crankcase.

[0058] The operating condition of the engine refers to the working state of the engine under different conditions. The engine has different speeds and loads under different operating conditions. Therefore, the amount of leakage in the combustion chamber is different under different operating conditions, which leads to different hydrogen concentrations in the crankcase. In other words, the operating condition of the engine can affect the hydrogen concentration in the crankcase.

[0059] The hydrogen concentration in the crankcase can be adjusted according to the current operating conditions of the engine and the hydrogen concentration in the crankcase.

[0060] Furthermore, various parameters of the engine during operation, such as vibration, temperature, pressure, speed, etc., are collected through the airborne system and the ground system, so as to judge the operating condition of the engine.

[0061] S200, adjusting the rotation speed of the centrifugal oil-gas separator according to the operating conditions.

[0062] When the engine is running at a high speed and load, the leakage of the combustion chamber is large. Increasing the speed of the centrifugal oil-gas separator can accelerate the discharge of hydrogen in the combustion chamber, thereby maintaining the hydrogen in the combustion chamber at a low level. In addition, increasing the speed of the centrifugal oil-gas separator can accelerate the separation of oil and gas, thereby reducing the loss of engine oil in the vehicle.

[0063] When the engine is currently operating, the engine speed and load are low, and the gas leakage in the combustion chamber is small. The centrifugal oil-gas separator can maintain the hydrogen in the combustion chamber at a low level at a low speed, thereby reducing the speed of the centrifugal separator and saving energy. In addition, the engine speed and load are low, and the low speed of the centrifugal oil-gas separator can meet the demand for oil-gas separation, so as to reduce the loss of engine oil in the vehicle.

[0064] By adjusting the speed of the centrifugal oil-gas separator according to the operating conditions, the hydrogen concentration in the crankcase can be corrected to maintain the hydrogen concentration level in the crankcase at a low level. In addition, by adjusting the speed of the centrifugal oil-gas separator according to the operating conditions, the oil and gas can be separated efficiently.

[0065] In some specific embodiments, S200, adjusting the rotation speed of the centrifugal oil-gas separator according to the operating conditions, includes:

[0066] sending a regulating signal to the centrifugal oil-gas separator according to the operating condition and a preset table, wherein the preset table is preset, the preset table is used to characterize the relationship between the operating condition and the rotational speed of the centrifugal oil-gas separator, and the regulating signal is used to instruct the centrifugal oil-gas separator to adjust the rotational speed;

[0067] In response to receiving the adjustment signal, the centrifugal oil-gas separator adjusts the rotation speed according to the adjustment signal.

[0068] The preset table is used to characterize the relationship between the operating conditions and the speed of the centrifugal oil-gas separator. For example, when the engine is in rated conditions, the speed of the centrifugal oil-gas separator is n1, when the engine is in full load conditions, the speed of the centrifugal oil-gas separator is n2, when the engine is in partial load conditions, the speed of the centrifugal oil-gas separator is n3, and so on.

[0069] Sending a regulation signal to the centrifugal oil-gas separator can instruct the oil-gas separator to adjust the speed. The object that sends the regulation signal can be an ECU, that is, the ECU sends the regulation signal to the centrifugal oil-gas separator. The regulation signal can be a duty cycle signal.

[0070] The centrifugal oil-gas separator adjusts the speed after receiving the adjustment signal, so as to adjust the speed of the centrifugal oil-gas separator according to the operating conditions.

[0071] After adjusting the rotation speed of the centrifugal oil-gas separator according to the operating conditions in S200, if the hydrogen concentration in the crankcase continues to increase, further measures need to be taken to reduce the hydrogen concentration in the crankcase.

[0072] To this end, in S300, when the hydrogen concentration increases, a first step is executed, wherein the first step includes: reducing the torque of the engine.

[0073] Reducing the torque of the engine can reduce the amount of blowby from the combustion chamber to the crankcase, thereby further reducing the hydrogen concentration in the crankcase, thereby maintaining the hydrogen concentration in the crankcase at a low level.

[0074] Furthermore, the hydrogen concentration in the crankcase is obtained, and when the hydrogen concentration at the current time is greater than the hydrogen concentration at the previous time, it is determined that the hydrogen concentration has increased.

[0075] The method for controlling the concentration of gas in the crankcase of the embodiment of the present invention is connected to the blow-by gas inlet of the crankcase through the blow-by gas outlet of the combustion chamber, the gas outlet of the crankcase is connected to the gas inlet of the centrifugal oil-gas separator, and the gas outlet of the centrifugal oil-gas separator is connected to the gas inlet of the combustion chamber, so that the centrifugal oil-gas separator can extract the gas in the crankcase when working, so that the blow-by gas in the crankcase can be accelerated to leave the crankcase. By adjusting the speed of the centrifugal oil-gas separator according to the operating conditions, the hydrogen concentration in the crankcase can be corrected, so that the level of hydrogen concentration in the crankcase is maintained at a low state. In addition, by adjusting the speed of the centrifugal oil-gas separator according to the operating conditions, oil and gas can also be separated efficiently. When the concentration in the crankcase further increases, the torque of the engine is reduced to reduce the amount of blow-by gas from the combustion chamber to the crankcase, so that the hydrogen concentration in the crankcase can be further reduced, and the hydrogen concentration in the crankcase is maintained at a low level.

[0076] In some embodiments, the first step in step S300 further includes: increasing the rotation speed of the centrifugal oil-gas separator.

[0077] When the hydrogen concentration increases, after adjusting the speed of the centrifugal oil-gas separator according to the operating conditions, the speed of the centrifugal oil-gas separator is further increased to accelerate the discharge of hydrogen in the combustion chamber, thereby maintaining the hydrogen in the combustion chamber at a lower level.

[0078] In some embodiments, when the hydrogen concentration increases, after executing the first step, the method for controlling the concentration of fuel gas in the crankcase further includes:

[0079] When the rotation speed of the centrifugal oil-gas separator is greater than or equal to the first threshold value and the hydrogen concentration in the crankcase increases, air is introduced into the crankcase through the venturi tube.

[0080] As some examples, the first threshold is a limiting rotation speed of the centrifugal oil-gas separator.

[0081] The venturi tube introduces air into the crankcase, which can dilute the hydrogen in the crankcase, thereby further reducing the hydrogen concentration in the crankcase, thereby maintaining the hydrogen concentration in the crankcase at a low level. In addition, the venturi tube introduces air into the crankcase, which can generate negative pressure in the crankcase, thereby accelerating the discharge of hydrogen in the crankcase, thereby further reducing the hydrogen concentration in the crankcase.

[0082] In some embodiments, the method for controlling the concentration of fuel gas in the crankcase further includes:

[0083] In response to a vehicle start signal, obtaining a real-time hydrogen concentration in a crankcase;

[0084] comparing the real-time hydrogen concentration with a second threshold;

[0085] When the real-time hydrogen concentration is greater than or equal to the second threshold, the centrifugal oil-gas separator is started.

[0086] When the vehicle is started, if the hydrogen concentration in the crankcase is high, the centrifugal oil-gas separator is started. In other words, if the hydrogen concentration in the crankcase is high, the centrifugal oil-gas separator is started in advance. This can reduce the hydrogen concentration in the crankcase in time and avoid potential safety hazards.

[0087] Optionally, the real-time hydrogen concentration is compared with a fifth threshold value; when the real-time hydrogen concentration is less than the fifth threshold value, the centrifugal oil-gas separator is stopped.

[0088] When the hydrogen concentration in the crankcase is low, the centrifugal oil-gas separator is stopped, thereby saving energy.

[0089] The value of the second threshold value and the value of the fifth threshold value may be the same, or the value of the second threshold value may be greater than the value of the fifth threshold value.

[0090] As some examples, the second threshold is greater than or equal to 30,000 ppm, and the second threshold is less than or equal to 35,000 ppm.

[0091] As some examples, the fifth threshold is less than or equal to the second threshold, the fifth threshold is greater than or equal to 30,000 ppm, and the fifth threshold is less than or equal to 35,000 ppm.

[0092] In some embodiments, the method for controlling the concentration of fuel gas in the crankcase further includes:

[0093] In response to a stop signal, obtaining a real-time hydrogen concentration in the crankcase;

[0094] comparing the real-time hydrogen concentration with a third threshold;

[0095] When the real-time hydrogen concentration is greater than or equal to the third threshold, the centrifugal oil-gas separator works with a delayed operation.

[0096] When the vehicle is parked and the hydrogen concentration in the crankcase is high, the centrifugal oil-gas separator is delayed in operation, so that the hydrogen concentration in the crankcase can be reduced in time after parking to avoid safety hazards.

[0097] In some embodiments, when the real-time hydrogen concentration is greater than or equal to the third threshold value and the centrifugal oil-gas separator works with a delay, the method for controlling the gas concentration in the crankcase further includes:

[0098] comparing the real-time hydrogen concentration with a fourth threshold;

[0099] When the real-time hydrogen concentration is less than the fourth threshold, the delayed operation of the centrifugal oil-gas separator is stopped.

[0100] When the hydrogen concentration in the crankcase is low, the centrifugal oil-gas separator is stopped, thereby saving energy.

[0101] The value of the third threshold value may be the same as the value of the fourth threshold value, or the value of the third threshold value may be greater than the value of the fourth threshold value.

[0102] As some examples, the third threshold is greater than or equal to 30,000 ppm, and the third threshold is less than or equal to 35,000 ppm.

[0103] As some examples, the fourth threshold is less than or equal to the third threshold, the fourth threshold is greater than or equal to 30,000 ppm, and the fourth threshold is less than or equal to 35,000 ppm.

[0104] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0105] Based on the same inventive concept, the embodiment of the present application also provides a crankcase gas concentration control device for implementing the crankcase gas concentration control method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more crankcase gas concentration control device embodiments provided below can refer to the limitations of the crankcase gas concentration control method above, and will not be repeated here.

[0106] The crankcase gas concentration control device of the embodiment of the present invention is applied to a vehicle, the vehicle includes an engine, a centrifugal oil-gas separator and a venturi tube, the engine includes a crankcase and a combustion chamber, the blow-by gas outlet of the combustion chamber is connected to the blow-by gas inlet of the crankcase, the gas outlet of the crankcase is connected to the gas inlet of the centrifugal oil-gas separator, the gas outlet of the centrifugal oil-gas separator is connected to the gas inlet of the combustion chamber, the venturi tube includes an inlet and an outlet, the outlet is connected to the crankcase, and the inlet is suitable for introducing positive pressure gas, and the crankcase gas concentration control device includes:

[0107] An acquisition module, used to acquire the current operating condition of the engine and the hydrogen concentration in the crankcase;

[0108] A regulating module, used to adjust the speed of the centrifugal oil-gas separator according to the operating conditions;

[0109] The execution module is used to execute the first step when the hydrogen concentration increases, wherein the first step includes: reducing the torque of the engine.

[0110] In some embodiments, the adjustment module is further configured to:

[0111] sending a regulating signal to the centrifugal oil-gas separator according to the operating condition and a preset table, wherein the preset table is preset, the preset table is used to characterize the relationship between the operating condition and the rotational speed of the centrifugal oil-gas separator, and the regulating signal is used to instruct the centrifugal oil-gas separator to adjust the rotational speed;

[0112] In response to receiving the adjustment signal, the centrifugal oil-gas separator adjusts the rotation speed according to the adjustment signal.

[0113] In some embodiments, the regulating module is further used to increase the rotation speed of the centrifugal oil-gas separator.

[0114] In some embodiments, the crankcase gas concentration control device also includes a control module for introducing air into the crankcase through a venturi tube when the rotation speed of the centrifugal oil-gas separator is greater than or equal to a first threshold and the hydrogen concentration in the crankcase increases.

[0115] In some embodiments, the crankcase gas concentration control device further includes an advance start module, and the advance start module is used to:

[0116] In response to a vehicle start signal, obtaining a real-time hydrogen concentration in a crankcase;

[0117] comparing the real-time hydrogen concentration with a second threshold;

[0118] When the real-time hydrogen concentration is greater than or equal to the second threshold, the centrifugal oil-gas separator is started.

[0119] In some embodiments, the crankcase gas concentration control device further includes a time-delay working module, which is used to:

[0120] In response to a stop signal, obtaining a real-time hydrogen concentration in the crankcase;

[0121] comparing the real-time hydrogen concentration with a third threshold;

[0122] When the real-time hydrogen concentration is greater than or equal to the third threshold, the centrifugal oil-gas separator works with a delayed operation.

[0123] In some embodiments, the method for controlling the concentration of fuel gas in the crankcase further includes a time-delayed work stop module, which is used to:

[0124] comparing the real-time hydrogen concentration with a fourth threshold;

[0125] When the real-time hydrogen concentration is less than the fourth threshold, the delayed operation of the centrifugal oil-gas separator is stopped.

[0126] Combination Figure 2 and Figure 3 As shown, an embodiment of the present invention further proposes a vehicle, the vehicle includes an engine, a centrifugal oil-gas separator, a venturi tube, a memory and a processor, the engine includes a crankcase and a combustion chamber, the blowby gas outlet of the combustion chamber is connected to the blowby gas inlet of the crankcase, the gas outlet of the crankcase is connected to the gas inlet of the centrifugal oil-gas separator, the gas outlet of the centrifugal oil-gas separator is connected to the air inlet of the combustion chamber, the venturi tube includes an air inlet and an air outlet, the air outlet is connected to the crankcase, and the air inlet is suitable for introducing positive pressure gas, the memory stores a computer program, the processor is connected to the engine, the centrifugal oil-gas separator and the venturi tube signal, and when the processor executes the computer program, the steps of the method for controlling the concentration of fuel gas in the crankcase of the above embodiment are implemented.

[0127] The vehicle of the embodiment of the present invention is connected to the blowby gas inlet of the crankcase through the blowby gas outlet of the combustion chamber, the gas outlet of the crankcase is connected to the gas inlet of the centrifugal oil-gas separator, and the gas outlet of the centrifugal oil-gas separator is connected to the gas inlet of the combustion chamber, so that the centrifugal oil-gas separator can extract the gas in the crankcase when working, so that the blowby gas in the crankcase can be accelerated to leave the crankcase. By introducing air into the crankcase through the venturi tube, the hydrogen in the crankcase can be diluted, so that the hydrogen concentration in the crankcase can be further reduced, and the hydrogen concentration in the crankcase can be maintained at a low level. In addition, the venturi tube introduces air into the crankcase, which can generate a negative pressure in the crankcase, thereby accelerating the discharge of hydrogen in the crankcase, and further reducing the hydrogen concentration in the crankcase.

[0128] Furthermore, the vehicle includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the vehicle is used to provide computing and control capabilities. The memory of the vehicle includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the vehicle is used to exchange information between the processor and an external device. The communication interface of the vehicle is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the method for controlling the concentration of fuel gas in the crankcase described in the above embodiment is implemented.

[0129] An embodiment of the present invention further proposes a computer storage medium having computer-readable instructions stored thereon. When the computer-readable instructions are read by one or more processors, the one or more processors execute the steps of the crankcase gas concentration control method implemented as above.

[0130] The logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable instructions for implementing logical functions, and may be embodied in any computer-readable storage medium for use by an instruction execution system, apparatus, or device (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, apparatus, or device and execute instructions), or in conjunction with such instruction execution system, apparatus, or device. For purposes of this specification, a "computer-readable storage medium" may be any device that can contain, store, communicate, propagate, or transmit a program for use by an instruction execution system, apparatus, or device, or in conjunction with such instruction execution system, apparatus, or device. More specific examples of computer-readable storage media (a non-exhaustive list) include the following: an electrical connection with one or more wirings (electronic devices), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM, Erasable Programmable Read-Only Memory, or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM, Compact Disc Read-Only Memory). In addition, the computer-readable storage medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0131] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA, Programmable Gate Array), a field programmable gate array (FPGA, Field Programmable Gate Array), etc.

[0132] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for controlling the concentration of combustion gas in a crankcase, characterized in that: The invention is applied to a vehicle, wherein the vehicle comprises an engine, a centrifugal oil-gas separator and a venturi tube, wherein the engine comprises a crankcase and a combustion chamber, wherein the blow-by gas outlet of the combustion chamber is connected to the blow-by gas inlet of the crankcase, wherein the gas outlet of the crankcase is connected to the gas inlet of the centrifugal oil-gas separator, wherein the gas outlet of the centrifugal oil-gas separator is connected to the gas inlet of the combustion chamber, wherein the venturi tube comprises an inlet and an outlet, wherein the outlet is connected to the crankcase, and the inlet is suitable for introducing positive pressure gas, wherein the method for controlling the gas concentration in the crankcase comprises: Obtain the current operating conditions of the engine and the hydrogen concentration in the crankcase; adjusting the speed of the centrifugal oil-gas separator according to the operating conditions; When the hydrogen concentration increases, a first step is performed, wherein the first step includes: reducing the torque of the engine.

2. The method for controlling the concentration of fuel gas in the crankcase according to claim 1, characterized in that: The adjusting the rotation speed of the centrifugal oil-gas separator according to the operating conditions comprises: sending a regulating signal to the centrifugal oil-gas separator according to the operating condition and a preset table, wherein the preset table is preset, the preset table is used to characterize the relationship between the operating condition and the rotational speed of the centrifugal oil-gas separator, and the regulating signal is used to instruct the centrifugal oil-gas separator to adjust the rotational speed; In response to receiving the adjustment signal, the centrifugal oil-gas separator adjusts the rotation speed according to the adjustment signal.

3. The method for controlling the concentration of fuel gas in the crankcase according to claim 1, characterized in that: The first step also includes: Increase the rotation speed of the centrifugal oil-gas separator.

4. The method for controlling the concentration of fuel gas in the crankcase according to claim 2, characterized in that: When the hydrogen concentration increases, after executing the first step, the method for controlling the concentration of fuel gas in the crankcase further includes: When the rotation speed of the centrifugal oil-gas separator is greater than or equal to a first threshold value and the hydrogen concentration in the crankcase increases, air is introduced into the crankcase through a venturi tube.

5. The method for controlling the concentration of fuel gas in a crankcase according to any one of claims 1 to 4, characterized in that: The crankcase fuel gas concentration control method further includes: In response to a vehicle start signal, obtaining a real-time hydrogen concentration in the crankcase; comparing the real-time hydrogen concentration with a second threshold; When the real-time hydrogen concentration is greater than or equal to a second threshold, the centrifugal oil-gas separator is started.

6. The method for controlling the concentration of fuel gas in a crankcase according to any one of claims 1 to 4, characterized in that: The crankcase fuel gas concentration control method further includes: In response to a stop signal, obtaining a real-time hydrogen concentration in the crankcase; comparing the real-time hydrogen concentration with a third threshold; When the real-time hydrogen concentration is greater than or equal to a third threshold, the centrifugal oil-gas separator operates with a delayed operation.

7. The method for controlling the concentration of fuel gas in the crankcase according to claim 6, characterized in that: When the real-time hydrogen concentration is greater than or equal to the third threshold value and the centrifugal oil-gas separator works with a delayed operation, the method for controlling the fuel gas concentration in the crankcase further includes: comparing the real-time hydrogen concentration with a fourth threshold; When the real-time hydrogen concentration is less than a fourth threshold, the delayed operation of the centrifugal oil-gas separator is stopped.

8. A crankcase gas concentration control device, characterized in that: Applied to a vehicle, the vehicle comprises an engine, a centrifugal oil-gas separator and a venturi tube, the engine comprises a crankcase and a combustion chamber, the blow-by gas outlet of the combustion chamber is connected to the blow-by gas inlet of the crankcase, the gas outlet of the crankcase is connected to the gas inlet of the centrifugal oil-gas separator, the gas outlet of the centrifugal oil-gas separator is connected to the gas inlet of the combustion chamber, the venturi tube comprises an inlet and an outlet, the outlet is communicated with the crankcase, the inlet is suitable for introducing positive pressure gas, and the crankcase gas concentration control device comprises: An acquisition module, used to acquire the current operating condition of the engine and the hydrogen concentration in the crankcase; A regulating module, used for adjusting the rotation speed of the centrifugal oil-gas separator according to the operating conditions; The execution module is used to execute a first step when the hydrogen concentration increases, wherein the first step includes: reducing the torque of the engine.

9. A vehicle, characterized in that: The vehicle includes an engine, a centrifugal oil-gas separator, a venturi tube, a memory and a processor, the engine includes a crankcase and a combustion chamber, the blowby gas outlet of the combustion chamber is connected to the blowby gas inlet of the crankcase, the gas outlet of the crankcase is connected to the gas inlet of the centrifugal oil-gas separator, the gas outlet of the centrifugal oil-gas separator is connected to the air inlet of the combustion chamber, the venturi tube includes an air inlet and an air outlet, the air outlet is connected to the crankcase, and the air inlet is suitable for passing positive pressure gas, the memory stores a computer program, the processor is signal-connected to the engine, the centrifugal oil-gas separator and the venturi tube, and when the processor executes the computer program, the steps of the method for controlling the concentration of fuel gas in the crankcase described in any one of claims 1 to 7 are implemented.

10. A computer storage medium, characterized in that: Computer readable instructions are stored on the computer storage medium. When the computer readable instructions are read by one or more processors, the one or more processors execute the steps of the crankcase gas concentration control method according to any one of claims 1 to 7.

Images