Engine air inlet pressure relief system, engine, vehicle, control method and medium

Abstract

The invention relates to the technical field of engines, in particular to an engine air inlet pressure relief system, an engine, a vehicle, a control method and a medium. A detection device is arranged on the gas inlet pipeline between the turbocharger and the throttle valve and is used for detecting the gas pressure and the gas flow of the gas inlet pipeline; and the controller is used for determining the target closing moment of the throttle valve and the target rotating speed of the turbocharger meeting the pressure relief requirement of the gas inlet pipeline according to the gas pressure and the gas flow, controlling the throttle valve to be closed when the target closing moment is reached, and controlling the rotating speed of the turbocharger to reach the target rotating speed. Therefore, the problems that an engine is large in size, high in cost and the like due to the fact that an air bypass valve is used for air inlet pressure relief in the related technology are solved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to an engine intake pressure relief system, an engine, a vehicle, a control method and a medium. Background Art

[0002] The intake pressure relief valve currently used in turbocharged engines is mainly to prevent the supercharger from surging when the vehicle is refueling. The structure of the turbocharged engine is as follows: Figure 1 As shown in the figure, when the throttle is closed or the engine suddenly decelerates, a large pressure is generated between the supercharger and the throttle, causing the supercharger compressor impeller to stall and surge. The intake pressure relief of the turbocharged engine uses a physical air bypass valve for intake pressure relief, but it will lead to a larger engine size and higher engine cost. Summary of the invention

[0003] The present application provides an engine intake pressure relief system, an engine, a vehicle, a control method and a medium to solve the problems in the related art of using an air bypass valve for intake pressure relief, resulting in a larger engine size and higher cost.

[0004] A first aspect of the present application provides an engine intake pressure relief system, comprising: a turbocharger and a throttle of the engine; a detection device is provided on the intake pipe between the turbocharger and the throttle, for detecting the gas pressure and gas flow of the intake pipe; a controller determines a target closing time of the throttle and a target speed of the turbocharger that meet the pressure relief requirements of the intake pipe according to the gas pressure and the gas flow, controls the throttle to close when the target closing time is reached, and controls the speed of the turbocharger to reach the target speed.

[0005] Optionally, the throttle valve and the turbocharger are both provided with a control unit.

[0006] Optionally, the detection device includes: a pressure sensor and a flow sensor, wherein the pressure sensor is used to detect the gas pressure of the intake pipeline, and the flow sensor is used to detect the gas flow of intake management.

[0007] Optionally, the turbocharger includes: an exhaust turbine and an intake turbine, which are coaxially connected to each other, wherein the exhaust turbine is used to utilize exhaust gas discharged when the engine is running to drive the intake turbine to operate; the intake turbine is used to inhale gas and pressurize the gas.

[0008] A second aspect of the present application provides an engine system, comprising an engine intake pressure relief system as described in the above embodiment.

[0009] A third aspect of the present application provides a vehicle, comprising an engine system as described in the above embodiment.

[0010] The fourth aspect of the present application provides a control method for an engine intake pressure relief system, which is applied to the engine intake pressure relief system as in the above embodiment, and includes the following steps: detecting the gas pressure and gas flow of the intake pipe at the current moment; determining the target closing time of the throttle and the target speed of the turbocharger that meet the intake pipe pressure relief requirements according to the gas pressure and the gas flow; controlling the throttle to close when the target closing time is reached, and controlling the speed of the turbocharger to reach the target speed.

[0011] Optionally, a target closing time of the throttle valve and a target speed of the turbocharger that meet the intake pipe pressure relief requirement are determined based on the gas pressure and the gas flow, including: calculating the compression ratio based on the atmospheric pressure and the gas pressure; determining a position point in a preset surge model based on the compression ratio and the turbocharger speed at the current moment; adjusting the position point within a preset safety boundary, and determining a target closing time of the throttle valve and a target speed of the turbocharger that meet the intake pipe pressure relief requirement based on the adjusted position point.

[0012] The fifth aspect of the present application provides a computer-readable storage medium having a computer program or instruction stored thereon. When the computer program or instruction is executed by a processor, it is used to implement a control method for an engine intake air pressure relief system as in the above-mentioned embodiment.

[0013] The sixth aspect of the present application provides a computer program product, including a computer program or instructions. When the computer program or instructions are executed, a control method for an engine intake air pressure relief system as in the above-mentioned embodiment is implemented.

[0014] Therefore, this application has at least the following beneficial effects:

[0015] The embodiment of the present application can detect the gas pressure and gas flow of the intake pipeline through the detection device, and the controller is used to control the turbocharger and the throttle according to the gas pressure and gas flow, so as to complete the intake pressure relief process of the engine, without using an air bypass valve for intake pressure relief, thus reducing the cost and optimizing the size of the engine. Therefore, the technical problems of using an air bypass valve for intake pressure relief in the related art, which leads to a larger engine size and higher cost, are solved.

[0016] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0018] Figure 1 Schematic diagram of an engine intake pressure relief system in the related art

[0019] Figure 2 A schematic diagram of an engine intake pressure relief system provided according to an embodiment of the present application;

[0020] Figure 3 It is a schematic diagram of an engine intake pressure relief system according to a specific embodiment of the present application;

[0021] Figure 4 A flow chart of a control method for an engine intake pressure relief system provided according to an embodiment of the present application;

[0022] Figure 5 The present invention is a flow chart of a method for controlling an engine intake air pressure relief system according to a specific embodiment of the present application. DETAILED DESCRIPTION

[0023] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0024] The engine intake pressure relief system, engine, vehicle, control method and medium of the embodiment of the present application are described below with reference to the accompanying drawings. In view of the fact that the intake pressure relief of the turbocharged engine mentioned in the above background technology all uses a physical air bypass valve for intake pressure relief, but it will cause the engine to be larger in size and higher in cost, the present application provides an engine intake pressure relief system, in which the gas pressure and gas flow of the intake pipeline can be detected by a detection device, and the controller is used to control the turbocharger and the throttle according to the gas pressure and gas flow, so as to complete the intake pressure relief process of the engine. Therefore, the problem of using an air bypass valve for intake pressure relief in the related technology, which leads to a larger engine size and higher cost, is solved.

[0025] Specifically, Figure 2 A schematic diagram of an engine intake pressure relief system provided in an embodiment of the present application.

[0026] like Figure 2 As shown, the engine intake air pressure relief system 10 includes: a turbocharger 11, a throttle valve 12, a detection device 13 and a controller 14.

[0027] Among them, the throttle 12 is the throttle 12 of the engine, the detection device 13 is arranged on the intake pipe between the turbocharger 11 and the throttle 12, and is used to detect the gas pressure and gas flow of the intake pipe. The controller 14 is used to determine the target closing time of the throttle and the target speed of the turbocharger that meet the pressure relief requirements of the intake pipe according to the gas pressure and the gas flow, control the throttle to close when the target closing time is reached, and control the speed of the turbocharger to reach the target speed.

[0028] It can be understood that the embodiment of the present application can use the detection device 13 and the controller 14 to complete the intake pressure relief process of the turbocharged engine, replacing the traditional intake pressure relief valve. The controller 14 determines the target closing time of the throttle valve and the target speed of the turbocharger that meet the intake line pressure relief requirements based on the gas pressure and gas flow measured by the detection device 13, controls the throttle valve to close when the target closing time is reached, and controls the speed of the turbocharger 11 to reach the target speed. Since the controller 14 already exists, the embodiment of the present application only adds a detection device 13. Compared with the intake pressure relief valve in the prior art, the embodiment of the present application can reduce the size of the engine and reduce material costs.

[0029] In the embodiment of the present application, the throttle valve 12 and the turbocharger 11 are both provided with a control unit.

[0030] It can be understood that the throttle 12 and the turbocharger 11 of the embodiment of the present application are both provided with a control unit so that the control unit controls the throttle 12 and the turbocharger 11 according to control instructions, which may specifically be a throttle control unit and a turbocharger control unit.

[0031] In the embodiment of the present application, the detection device 13 includes a pressure sensor and a flow sensor.

[0032] Among them, the pressure sensor is used to detect the gas pressure in the intake pipe, and the flow sensor is used to detect the gas flow of intake management.

[0033] In the embodiment of the present application, the turbocharger 11 includes an exhaust turbine and an intake turbine.

[0034] Among them, the exhaust turbine and the intake turbine are coaxially connected. The exhaust turbine is used to utilize the exhaust gas discharged when the engine is running to drive the intake turbine to operate; the intake turbine is used to inhale gas and pressurize the gas.

[0035] Specifically, the engine intake pressure relief system of the embodiment of the present application has the following specific results: Figure 3As shown, it includes a wheel speed sensor, an exhaust turbine, an intake turbine, a pressure and flow sensor, a throttle and a throttle control unit. Among them, the speed sensor is used to obtain the speed of the supercharger; the pressure and flow sensor is used to obtain the pressure and flow of the supercharged gas; the throttle control unit is used to control the throttle closing time according to the supercharger speed and the pressure and flow of the supercharged gas.

[0036] According to the engine intake pressure relief system proposed in the embodiment of the present application, the gas pressure and gas flow of the intake pipeline can be detected by a detection device, and the controller is used to control the turbocharger and the throttle according to the gas pressure and gas flow, so as to complete the engine's intake pressure relief process. There is no need to use an air bypass valve for intake pressure relief, which reduces costs and optimizes the size of the engine.

[0037] An embodiment of the present application also provides an engine system, comprising the above-mentioned engine intake pressure relief system.

[0038] An embodiment of the present application also provides a vehicle, comprising the above-mentioned engine system.

[0039] Next, a control method for an engine intake pressure relief system according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0040] like Figure 4 As shown, the control method of the engine intake pressure relief system is applied to the above-mentioned engine intake pressure relief system, and comprises the following steps:

[0041] In step S101, the gas pressure and gas flow rate of the intake pipe at the current moment are detected.

[0042] Among them, the embodiment of the present application can use a detection device to detect the gas pressure and gas flow of the intake pipeline, for example, it can be a pressure and flow sensor.

[0043] In step S102, a target closing time of the throttle valve and a target speed of the turbocharger that meet the pressure relief requirement of the intake line are determined according to the gas pressure and the gas flow rate.

[0044] It can be understood that the embodiment of the present application can determine the target closing time of the throttle and the target speed of the turbocharger that meet the intake line pressure relief requirements based on the gas pressure and gas flow, so as to adjust the throttle and turbocharger in advance to prevent the engine from surging. The specific determination process is as follows.

[0045] In an embodiment of the present application, a target closing time of the throttle valve and a target speed of the turbocharger that meet the intake pipe pressure relief demand are determined based on the gas pressure and the gas flow rate, including: calculating the compression ratio based on the atmospheric pressure and the gas pressure; determining a position point in a preset surge model based on the compression ratio and the turbocharger speed at the current moment; adjusting the position point within a preset safety boundary, and determining a target closing time of the throttle valve and a target speed of the turbocharger that meet the intake pipe pressure relief demand based on the adjusted position point.

[0046] The preset surge model is a surge model of a turbocharger, which includes a pressure ratio-flow diagram of the turbocharger, with a surge line marked on the diagram. If the surge line is exceeded, the engine will surge. The surge line is the preset safety boundary.

[0047] It can be understood that the embodiment of the present application can determine the position point in the preset surge model according to the compression ratio of atmospheric pressure and gas pressure and the speed of the turbocharger, and then adjust the position point within the preset safety boundary, and determine the target closing time of the throttle valve and the target speed of the turbocharger that meet the intake line pressure relief requirements according to the adjusted position point.

[0048] In step S103, the throttle valve is controlled to close when the target closing time is reached, and the speed of the turbocharger is controlled to reach the target speed.

[0049] It is understandable that the embodiment of the present application can control the throttle to close when the target closing time is reached, and control the speed of the turbocharger to reach the target speed to complete the pressure relief of the engine.

[0050] For example, the throttle closing time of the embodiment of the present application is when the brake pedal is suddenly pressed down to make the braking acceleration reach 0.6*g (gravitational acceleration) and last for more than 1 second, the throttle opening, supercharger speed, air pressure at the supercharger outlet and air flow at the engine inlet are obtained at this moment. The compression ratio is obtained by using the post-compression gas pressure / atmospheric pressure, and the position of this point in the surge model is determined by the obtained compression ratio and the measured flow.

[0051] For example, combining Figure 3 The specific process of the control method of the engine intake pressure relief system of the embodiment of the present application is as follows: Figure 5 As shown, including:

[0052] Collect and process data: obtain supercharger speed rpm, compressed gas pressure P in real time out and air flow F low Filter and correct the sensor data to ensure that the data is accurate and reliable.

[0053] Throttle control unit: Set the throttle control unit control strategy, take the supercharger speed and compressed gas and atmospheric pressure as input, and get a point within the surge line. This point represents a supercharger speed and the air pressure at the supercharger outlet. According to the real-time data, the point is made to be within the surge line. The control unit outputs throttle closure to achieve the effect of late throttle closing. The control unit adjusts the throttle closing time to keep the operating point stable and avoid approaching the surge boundary.

[0054] When the throttle is closed late, the supercharger continues to discharge gas to reduce the supercharger speed. The compressed gas pressure decreases, and the compressed gas flows into the cylinder through the throttle to participate in combustion and be discharged from the engine, achieving a pressure relief effect.

[0055] According to the control method of the engine intake pressure relief system proposed in the embodiment of the present application, the target closing time of the throttle valve and the target speed of the turbocharger can be determined according to the gas pressure and gas flow after supercharging, so that the turbocharger and the throttle valve are controlled according to the gas pressure and gas flow to complete the engine's intake pressure relief process. There is no need to use an air bypass valve for intake pressure relief, which reduces costs and optimizes the size of the engine.

[0056] An embodiment of the present application also provides a computer-readable storage medium on which a computer program or instruction is stored. When the computer program or instruction is executed by a processor, the control method of the engine intake air pressure relief system as described above is implemented.

[0057] An embodiment of the present application also provides a computer program product, including a computer program or instructions, which, when executed, implements the control method of the engine intake air pressure relief system as described above.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0061] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N 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 or a combination of multiple of the following technologies known in the art: 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), a field programmable gate array (FPGA), etc.

[0062] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

Claims

1. An engine intake pressure relief system, characterized in that: include: Turbochargers and engine throttles; A detection device is provided on the intake pipeline between the turbocharger and the throttle valve, for detecting the gas pressure and gas flow of the intake pipeline; The controller determines a target closing time of the throttle valve and a target speed of the turbocharger that meet the pressure relief requirement of the intake line according to the gas pressure and the gas flow rate, controls the throttle valve to close when the target closing time is reached, and controls the speed of the turbocharger to reach the target speed.

2. The engine intake pressure relief system according to claim 1, characterized in that: The throttle valve and the turbocharger are both provided with a control unit.

3. The engine intake pressure relief system according to claim 1, characterized in that: The detection device includes: a pressure sensor and a flow sensor, wherein the pressure sensor is used to detect the gas pressure of the intake pipe, and the flow sensor is used to detect the gas flow of the intake management.

4. The engine intake air pressure relief system according to claim 1, characterized in that: The turbocharger comprises: an exhaust turbine and an intake turbine, wherein the exhaust turbine and the intake turbine are coaxially connected, wherein: The exhaust turbine is used to utilize the exhaust gas discharged when the engine is running to drive the intake turbine to operate; The intake turbine is used to inhale the gas and pressurize the gas.

5. An engine system, characterized in that: It comprises the engine intake air pressure relief system as described in claims 1-4.

6. A vehicle, characterized in that: Comprising the engine system as claimed in claim 5.

7. A control method for an engine intake pressure relief system, characterized in that: The engine intake pressure relief system as claimed in claims 1 to 4 comprises the following steps: Detect the gas pressure and gas flow of the air intake pipeline at the current moment; Determining a target closing time of a throttle valve and a target speed of a turbocharger that meet a pressure relief requirement of an intake pipe according to the gas pressure and the gas flow rate; The throttle valve is controlled to be closed when the target closing time is reached, and the speed of the turbocharger is controlled to reach the target speed.

8. The control method of the engine intake pressure relief system according to claim 7, characterized in that: The step of determining the target closing time of the throttle valve and the target speed of the turbocharger that meet the pressure relief requirement of the intake pipeline according to the gas pressure and the gas flow rate includes: Calculating a compression ratio based on the atmospheric pressure and the gas pressure; Determine a position point in a preset surge model according to the compression ratio and the turbocharger speed at the current moment; The position point is adjusted within a preset safety boundary, and a target closing time of the throttle valve and a target speed of the turbocharger that meet the intake line pressure relief requirement are determined according to the adjusted position point.

9. A computer-readable storage medium having a computer program or instruction stored thereon, characterized in that: When the computer program or instruction is executed by the processor, it is used to implement the control method of the engine intake air decompression system as claimed in claim 7 or 8.

10. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed, the control method of the engine intake air decompression system as claimed in claim 7 or 8 is implemented.

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