An air intake system, control method, and engine

Abstract

The application relates to an air intake system, a control method and an engine. The air intake system comprises an air intake pipe, an air intake manifold and an air intake manifold group. The air intake manifold has multiple inlets and multiple outlets. Each outlet is used for one-to-one communication with a cylinder of an engine body through an air intake branch pipe. Each inlet is arranged at intervals along the arrangement direction of each outlet. The air intake manifold group comprises multiple parallel air intake manifold pipes. The first end of each air intake manifold pipe is communicated with the air intake pipe, and the second end is one-to-one communicated with the inlet. The air intake manifold group comprises at least one first air intake manifold pipe and at least one second air intake manifold pipe. An air intake heating device is arranged in the at least one first air intake manifold pipe. The air intake pipe is provided with a flow regulating valve to adjust the flow area between the air intake pipe and the first air intake manifold pipe and the second air intake manifold pipe. The air intake system can improve the air intake uniformity of each cylinder of the engine body and ensure the cold start effect of the engine.

Description

Technical Field

[0001] This invention relates to the field of internal combustion engine technology, and in particular to an intake system, control method, and engine. Background Technology

[0002] As an important component of the engine, the intake system's structural design affects the consistency of air intake in each cylinder, which in turn affects the consistency of combustion in each cylinder, and is of great significance to the stability of engine performance.

[0003] like Figure 1 and Figure 2 As shown, the intake system of a conventional engine consists of an intake manifold 100, an intake manifold 200, and an intake branch pipe 300. The intake manifold 200 has one inlet and multiple outlets. The inlet is connected to the intake manifold 100, and the outlets are connected to each cylinder of the engine through the intake branch pipe 300.

[0004] Because the intake manifold 200 has only one inlet, the distances from the gas entering the intake manifold 200 to the intake branch pipe 300 vary, resulting in different friction losses. This leads to an imbalance in the intake volume of each cylinder of the engine. Figure 2 For example, in Figure 2 The central intake manifold inlet is close to cylinders 1, 2, and 3, resulting in these three cylinders having a larger intake volume than the other three. In particular, cylinder 6 is far from the intake manifold inlet, so its intake volume will be much lower than the other cylinders. Summary of the Invention

[0005] The first objective of this invention is to provide an intake system that improves the uniformity of air intake in each cylinder of an engine.

[0006] A second objective of the present invention is to provide a control method for the above-described intake system and an engine.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] In a first aspect of this application, an intake system is provided, comprising:

[0009] Intake pipe;

[0010] The intake manifold has multiple inlets and multiple outlets. Each outlet is connected to a cylinder of the engine block through an intake branch pipe. Each inlet is spaced apart along the arrangement direction of each outlet.

[0011] An intake manifold assembly includes multiple intake manifolds connected in parallel. The first end of each intake manifold is connected to the intake connector, and the second end of each intake manifold is connected to the inlet. The intake manifold assembly includes at least one first intake manifold and at least one second intake manifold. An intake heating device is provided in the at least one first intake manifold. The intake connector is provided with a flow regulating valve to adjust the flow area between the intake connector and the first and second intake manifolds, so that the intake system can switch between three states: the intake connector is only connected to the first intake manifold, the intake connector is only connected to the second intake manifold, and the intake connector is connected to both the first and second intake manifolds.

[0012] In one possible implementation, the number of the first intake splitter pipes is the same as the number of the second intake splitter pipes.

[0013] In one possible implementation, each of the first intake manifolds constitutes a first intake manifold group, and each of the second intake manifolds constitutes a second intake manifold group. The first intake manifold group and the second intake manifold group are arranged at intervals along the cylinder arrangement direction of the engine block. Each of the first intake manifolds in the first intake manifold group and each of the second intake manifolds in the second intake manifold group are arranged at intervals along the cylinder arrangement direction of the engine block.

[0014] In one possible implementation, each of the first intake manifolds and each of the second intake manifolds are symmetrically distributed about the geometric center of the engine block.

[0015] In one possible implementation, the shape and size of the connection between the intake pipe and the first and second intake split pipes are the same. The flow regulating valve includes a valve plate, a valve shaft, and a drive mechanism. The shape and size of the valve plate are adapted to the shape and size of the connection between the intake pipe and the second intake split pipe. One end of the valve plate is rotatably disposed at the intersection of the intake pipe, the first intake split pipe, and the second intake split pipe via the valve shaft. The drive mechanism is drivenly connected to the valve shaft to drive the valve plate to rotate between a minimum opening position and a maximum opening position. The minimum opening position is the position where the valve plate blocks the connection between the intake pipe and the second intake split pipe.

[0016] In one possible implementation, the intake heating device is an intake heating grille.

[0017] In one possible implementation, the intake heating device is located near the end of the first intake splitter pipe that connects to the intake manifold.

[0018] In one possible implementation, the intake manifold is connected to an EGR pipe upstream of the intake manifold assembly, and an intake throttle valve for adjusting the intake airflow is provided upstream of the EGR pipe.

[0019] As can be seen from the above technical solutions, the intake system provided by the present invention includes an intake manifold, an intake manifold, and an intake splitter assembly. The intake manifold has multiple inlets and multiple outlets, each outlet being connected to a cylinder in the engine block via an intake branch pipe. The inlets are spaced apart along the direction of the outlets. The intake splitter assembly includes multiple parallel intake splitters. The first end of each intake splitter is connected to the intake manifold, and the second end of each intake splitter is connected to an inlet. The flow pipe assembly includes at least one first intake split pipe and at least one second intake split pipe. An intake heating device is installed in the at least one first intake split pipe. A flow regulating valve is installed in the intake pipe to adjust the flow area between the intake pipe and the first and second intake split pipes, so that the intake system can switch between three states: the intake pipe is only connected to the first intake split pipe, the intake pipe is only connected to the second intake split pipe, and the intake pipe is connected to both the first and second intake split pipes.

[0020] In application, under normal temperature start-up conditions, the flow control valve is in a state where the intake pipe is connected to the first intake split pipe and the second intake split pipe respectively. The intake air in the intake pipe enters the intake manifold through each of the first intake split pipes and each of the second intake split pipes. Since the inlets of each intake manifold are spaced apart along the direction of each outlet, the difference in distance from each intake split pipe to each outlet is reduced. Combined with the control of the opening of the flow control valve, the uniformity of intake air in each cylinder of the engine can be effectively improved.

[0021] When starting in low temperatures, the engine needs to warm up quickly. At this time, the flow control valve can be set to connect the intake manifold only to the first intake splitter pipe, and the intake heating device can be turned on so that some or all of the intake air passes through the intake heating device to quickly increase the intake air temperature and achieve rapid engine warm-up.

[0022] When the engine is stopped in a low-temperature environment, water vapor in the air is prone to condense and freeze in the intake system, especially at the location of the intake heating device. In order to exchange heat with the intake air, the pores are small. Once frozen, it will affect the air flow. In this case, the flow control valve can be set to a state where the intake pipe is only connected to the second intake split pipe, so that the intake air bypasses the first intake split pipe and flows entirely through the second intake split pipe, which does not have an intake heating device, thus ensuring the cold start effect of the engine.

[0023] In a second aspect of this application, a control method for an intake system as described in the first aspect and its possible implementations is provided, comprising:

[0024] Step a): Obtain the engine intake air flow in real time, use the engine intake air flow as an index to look up the flow control valve opening setting table, obtain the basic setting opening, and output the basic setting opening as the first required opening to the first virtual switch;

[0025] Step b): Real-time acquisition of engine coolant temperature and intake air temperature. If the coolant temperature is less than the coolant temperature threshold or the intake air temperature is less than the intake air temperature threshold, a first signal is output to the first virtual switch. The first virtual switch outputs the minimum opening degree as the second required opening degree to the second virtual switch. The minimum opening degree is when the flow regulating valve is in a state where the intake pipe is only connected to the first intake split pipe. If the coolant temperature is greater than or equal to the coolant temperature threshold or the intake air temperature is greater than or equal to the intake air temperature threshold, a second signal is output to the first virtual switch. The first virtual switch outputs the first required opening degree as the second required opening degree to the second virtual switch.

[0026] Step c): Real-time acquisition of engine intake pressure, engine speed, and cyclic fuel injection quantity, and using engine speed and cyclic fuel injection quantity as indexes, look up the intake pressure threshold setting table to obtain the intake pressure threshold. If the engine intake pressure is less than the intake pressure threshold, a third signal is output to the second virtual switch, and the second virtual switch outputs the intermediate opening degree as the final set opening degree. If the engine intake pressure is greater than or equal to the intake pressure threshold, a fourth signal is output to the second virtual switch, and the second virtual switch outputs the second required opening degree as the final set opening degree to control the opening degree of the flow regulating valve to the final set opening degree.

[0027] In a third aspect of this application, an engine is provided, including an intake system as described in the first aspect and its possible implementations.

[0028] Since the control method and engine employ the intake system described in the first aspect and its possible implementations, the control method and engine should have the same beneficial effects as the aforementioned intake system, which will not be elaborated further here. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1This is a schematic diagram of the structure of an air intake system in the prior art;

[0031] Figure 2 This is a schematic diagram of the airflow in an existing intake system.

[0032] Figure 3 This is a schematic diagram of the intake system provided in an embodiment of the present invention;

[0033] Figure 4 A flowchart of a control method for an intake system provided in an embodiment of the present invention.

[0034] In the picture:

[0035] 100 is the intake pipe; 200 is the intake manifold; 300 is the intake branch pipe; 400 is the first intake split pipe; 500 is the second intake split pipe; 600 is the intake heating device; 700 is the flow control valve; 800 is the intake throttle valve; 900 is the EGR pipe. Detailed Implementation

[0036] One of the core aspects of this invention is to provide an intake system whose structural design enables it to improve the uniformity of air intake to each cylinder of an engine.

[0037] Another core aspect of this invention is to provide a control method and an engine based on the aforementioned intake system.

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] This application provides an intake system, such as... Figure 3 As shown, the intake system includes an intake pipe 100, an intake manifold 200, and an intake splitter assembly.

[0040] The intake manifold 100 is located downstream of the intercooler of the vehicle or engine, connecting the downstream pipe of the intercooler and the intake manifold 200, and guiding the intercooled gas through the intake pressure regulating chamber into the intake manifold 200.

[0041] The intake manifold 200 is located between the outlet of the intake pressure regulating chamber and the intake inlet of the engine block cylinder head. Its purpose is to ensure that the intake air enters each cylinder of the engine block evenly, so as to ensure the combustion consistency of each cylinder and meet the engine performance requirements. In this application, the intake manifold 200 has multiple inlets and multiple outlets. Each outlet is used to connect to the cylinder of the engine block one by one through the intake branch pipe 300. Each inlet is spaced apart along the arrangement direction of each outlet.

[0042] The intake manifold assembly includes multiple intake manifolds connected in parallel. The first end of each intake manifold is connected to the intake pipe 100, and the second end of each intake manifold is connected to the inlet in a corresponding manner. The intake manifold assembly includes at least one first intake manifold 400 and at least one second intake manifold 500. The number of first intake manifolds 400 may be the same as or different from the number of second intake manifolds. An intake heating device 600 is provided in at least one first intake manifold 400, and a flow regulating valve 700 is provided in the intake pipe 100. The position and number of flow regulating valves 700 can be adjusted according to the number and relative layout of the first intake manifolds 400 and the second intake manifolds 500.

[0043] The first intake split pipe 400 and the second intake split pipe 500 can be arranged alternately along the outlet direction of the intake manifold 200, or they can be respectively set on both sides of the intake manifold 200, or the second intake split pipe 500 can be set in the middle of the intake manifold 200 and the first intake split pipe 400 is distributed on both sides of the second intake split pipe 500, or the first intake split pipe 400 can be set in the middle of the intake manifold 200 and the second intake split pipe 500 is distributed on both sides of the first intake split pipe 400.

[0044] exist Figure 3 In the illustrated embodiment, the intake manifold assembly includes a first intake manifold 400 and a second intake manifold 500. A flow regulating valve 700 is positioned at the connection point between the intake manifold 100 and both the first and second intake manifolds 400 and 500, specifically at the throat where the intake manifold 100 branches off towards both the first and second intake manifolds 400 and 500. This allows the flow regulating valve 700 to connect both the intake manifold 100 to both the first and second intake manifolds 400 and 500. Figure 3 When the valve plate of the medium flow regulating valve 700 is in position c, it can also connect the intake pipe 100 only to the first intake split pipe 400. Figure 3 When the valve plate of the medium flow regulating valve 700 is in position a), it can also connect the intake pipe 100 only to the second intake split pipe 500. Figure 3 When the valve plate of the medium flow regulating valve 700 is in position b).

[0045] When the first intake splitter 400 and the second intake splitter 500 are arranged in other ways, similar arrangements can be adopted as appropriate. Figure 3 In this arrangement, a flow regulating valve 700 is installed between the first intake split pipe 400 and the second intake split pipe 500. Alternatively, a flow regulating valve 700 can be installed at the connection between the intake pipe 100 and the first intake split pipe 400, and at the connection between the intake pipe 100 and the second intake split pipe 500.

[0046] In this application, the flow regulating valve 700 is used to adjust the flow area between the intake pipe 100 and the first intake split pipe 400 and the second intake split pipe 500, so that the intake system can switch between three states: the intake pipe 100 is only connected to the first intake split pipe 400, the intake pipe 100 is only connected to the second intake split pipe 500, and the intake pipe 100 is connected to both the first intake split pipe 400 and the second intake split pipe 500.

[0047] The intake manifold 200 is also provided with an outlet on the side away from the intake splitter assembly, which corresponds to the cylinder of the engine block. Each outlet is connected to an intake branch pipe 300, which is connected to the cylinder intake port on the engine cylinder head.

[0048] In application, under normal temperature start-up conditions, the flow regulating valve 700 is in a state where the intake pipe 100 is connected to the first intake split pipe 400 and the second intake split pipe 500 respectively. The intake air in the intake pipe 100 enters the intake manifold 200 through each of the first intake split pipes 400 and each of the second intake split pipes 500. Since the inlets of each intake manifold 200 are spaced apart along the direction of each outlet, the difference in distance from each intake split pipe to each outlet is reduced. Combined with the control of the opening of the flow regulating valve 700, the uniformity of intake air in each cylinder of the engine block can be effectively improved.

[0049] When starting in low temperature conditions, the engine needs to warm up quickly. At this time, the flow regulating valve 700 can be set to connect the intake pipe 100 only to the first intake split pipe 400, and the intake heating device 600 can be turned on so that part or all of the intake air passes through the intake heating device 600, which can quickly raise the intake air temperature and achieve rapid engine warm-up.

[0050] When the engine is stopped in a low-temperature environment, water vapor in the air is prone to condense and freeze in the intake system, especially at the intake heating device 600. In order to exchange heat with the intake air, the pores are small. Once frozen, it will affect the air flow. In this case, the flow regulating valve 700 can be set so that the intake pipe 100 is only connected to the second intake split pipe 500, so that the intake air bypasses the first intake split pipe 400 and flows entirely through the second intake split pipe 500, which does not have an intake heating device 600, thus ensuring the cold start effect of the engine.

[0051] Compared with the prior art, the intake system provided in this application embodiment can guide the intake air into the intake manifold 200 more evenly by setting multiple intake split pipes, thereby improving the uniformity and consistency of the air output of each outlet of the intake manifold 200 and realizing balanced air intake of each cylinder. At the same time, in the cold start stage in cold regions, the intake flow rate and / or intake temperature can be guaranteed by controlling the state of the flow regulating valve 700, thus ensuring cold start performance.

[0052] In one embodiment of this application, the number of first intake splitter pipes 400 is the same as the number of second intake splitter pipes 500, that is, the number of intake splitter pipes in the intake splitter pipe group is even. Please refer to [link to relevant documentation]. Figure 3 In the illustrated embodiment, in an inline six-cylinder engine, the intake manifold assembly includes a first intake manifold 400 and a second intake manifold 500. The outlet of the first intake manifold 400 is located near cylinders 1, 2, and 3 of the engine block, and the outlet of the second intake manifold 500 is located near cylinders 4, 5, and 6 of the engine block. This ensures that the distances from the outlet of the first intake manifold 400 to cylinders 1, 2, and 3 and the distances from the outlet of the second intake manifold 500 to cylinders 4, 5, and 6 are not significantly different, resulting in similar friction loss. This effectively ensures the uniformity and consistency of the intake volume in each cylinder.

[0053] It should be noted that, Figure 3 This is merely a schematic diagram. In practical applications, the outlets of the first intake split pipe 400 and the second intake split pipe 500 should be avoided from being positioned opposite to the outlet of the intake manifold 200, so as to prevent all or most of the airflow in the intake split pipe from entering the intake branch pipe 300 connected to the outlet of the opposite intake manifold 200.

[0054] Of course, the intake manifold 200 can also be provided with the same number of intake split pipes as the intake manifold. The first intake split pipe 400 and the second intake split pipe 500 are connected to the intake buffer chambers respectively. The airflow inside them is buffered by the intake buffer chambers before entering the intake manifold 200.

[0055] To facilitate the setting of the flow regulating valve 700, in one embodiment of this application, each first intake split pipe 400 constitutes a first intake split pipe group, and each second intake split pipe 500 constitutes a second intake split pipe group. The first intake split pipe group and the second intake split pipe group are arranged alternately along the cylinder arrangement direction of the engine block. Each first intake split pipe 400 in the first intake split pipe group and each second intake split pipe 500 in the second intake split pipe group are arranged alternately along the cylinder arrangement direction of the engine block. With this arrangement, only the flow regulating valve 700 needs to be set at the throat position between the first intake split pipe 400 and the second intake split pipe 500. One flow regulating valve 700 can control the opening and closing of the first intake split pipe 400 and the second intake split pipe 500.

[0056] To ensure the uniformity and consistency of the intake airflow at each outlet of the intake manifold 200, each first intake split pipe 400 and each second intake split pipe 500 are symmetrically or substantially symmetrically distributed about the geometric center of the engine block. Of course, small deviations caused by manufacturing errors or limitations of other components around the intake manifold 200 also fall within the scope of the symmetrical or substantially symmetrical distribution of each first intake split pipe 400 and each second intake split pipe 500 about the geometric center of the engine block.

[0057] The shape and size of the connection between the intake pipe 100 and the first intake split pipe 400 and the second intake split pipe 500 are the same, so that the valve plate of the flow regulating valve 700 can block the inlets of the first intake split pipe 400 and the second intake split pipe 500.

[0058] Specifically, such as Figure 3 As shown, the flow regulating valve 700 includes a valve plate, a valve shaft, and a drive mechanism. The shape and size of the valve plate are adapted to the shape and size of the connection between the intake pipe 100 and the second intake split pipe 500. One end of the valve plate is rotatably mounted at the throat where the intake pipe 100, the first intake split pipe 400, and the second intake split pipe 500 meet, via the valve shaft. The drive mechanism is connected to the valve shaft to drive the valve plate to rotate between the minimum opening position and the maximum opening position. The minimum opening position is the position where the valve plate blocks the connection between the intake pipe 100 and the second intake split pipe 500, i.e. Figure 3 The position 'a' in the text.

[0059] Preferably, the intake heating device 600 in this application is an intake heating grille. The intake heating grille can divide the cavity of the first intake split pipe 400 into a dense array of heating channels, so that the airflow is divided into multiple streams and passes through each heating channel, thereby achieving rapid heating of the airflow in the first intake split pipe 400.

[0060] Please see Figure 3The intake heating device 600 is located near the end of the first intake split pipe 400 that connects to the intake manifold 200, so that the intake heating device 600 is away from the flow regulating valve 700 and closer to the intake manifold 200. Of course, it should be noted that multiple intake heating devices 600 can be set in the first intake split pipe 400 along the gas flow direction.

[0061] To ensure effective cold starts in cold regions, EGR (Exhaust Gas Recirculation) is often activated. This involves recirculating a portion of the engine's exhaust gas back into the cylinders, mixing it with fresh intake air. This improves engine efficiency, enhances the combustion environment, reduces engine load, decreases NOx emissions, reduces knocking, extends the lifespan of components, and ensures rapid engine warm-up in cold conditions. Figure 3 As shown, the intake pipe 100 is connected to the EGR pipe 900 upstream of the intake split pipe assembly. An EGR valve is installed on the EGR pipe 900, and an intake throttle valve 800 for adjusting the intake airflow is installed upstream of the EGR pipe 900 on the intake pipe 100. The intake throttle valve 800 is used to adjust the intake airflow, and the EGR valve is used to adjust the EGR exhaust gas flow.

[0062] This application also provides a control method for the intake system as described in the above embodiments. Please refer to [link to relevant documentation]. Figure 4 The control method includes:

[0063] Step a): Obtain the engine intake air flow in real time, use the engine intake air flow as an index to look up the flow control valve opening setting table, obtain the basic setting opening, and output the basic setting opening as the first required opening to the first virtual switch.

[0064] The engine intake system is equipped with an air flow sensor or MAF sensor, which is usually installed on the engine intake manifold 100, after the air filter element and before the intake throttle valve 800. It accurately measures the flow rate of the filtered fresh air and transmits the data to the engine control unit (ECU) in a timely manner so that the ECU can accurately calculate the fuel injection quantity based on the intake air volume.

[0065] It should be noted that the flow control valve opening setting table in this application is related to the engine intake air flow, but the engine intake air flow is not necessarily the fresh air flow. If the engine does not have an EGR system, the intake air flow refers to the fresh air flow, and the flow control valve opening setting table is only related to the engine intake air flow. The flow control valve opening setting table is a one-dimensional data matrix based on the intake air flow. If there is an EGR system, the intake air flow refers to both the fresh air flow and the EGR exhaust gas flow. In this case, the flow control valve opening setting table is a two-dimensional data matrix based on the intake air flow and the EGR rate, where EGR rate = exhaust gas flow / (fresh air flow + exhaust gas flow) × 100%.

[0066] After obtaining the intake air flow data, the ECU obtains the basic set opening by querying the flow control valve opening setting table. This basic set opening is limited by the maximum opening of the flow control valve 700. However, this basic set opening cannot be directly output as the final set opening. Other engine parameters need to be detected to comprehensively determine the current state of the engine.

[0067] In this application Figure 3 For example, the maximum opening of the flow regulating valve 700 is the position where the valve plate is rotated 180° to the left from position a.

[0068] Step b): Real-time acquisition of engine coolant temperature and intake air temperature. If the coolant temperature is less than the coolant temperature threshold or the intake air temperature is less than the intake air temperature threshold, a first signal is output to the first virtual switch. The first virtual switch outputs the minimum opening degree as the second required opening degree to the second virtual switch. The minimum opening degree is when the flow regulating valve 700 is in a state where the intake pipe 100 is only connected to the first intake split pipe 400. If the coolant temperature is greater than or equal to the coolant temperature threshold or the intake air temperature is greater than or equal to the intake air temperature threshold, a second signal is output to the first virtual switch. The first virtual switch outputs the first required opening degree as the second required opening degree to the second virtual switch.

[0069] When the coolant temperature is below the coolant temperature threshold, or the intake air temperature is below the intake air temperature threshold, it indicates that the engine is in a cold start state and needs to warm up quickly. At this time, the intake air needs to flow through the intake air heater 60° to rapidly raise its temperature. Therefore, the first virtual switch outputs its minimum opening as the second required opening to the second virtual switch. The minimum opening is... Figure 3 The position 'a' in the text.

[0070] If the coolant temperature is greater than or equal to the coolant temperature threshold, or the intake air temperature is greater than or equal to the intake air temperature threshold, the engine is not in a cold start state and does not need to heat the intake air. In this case, the basic setting opening is used as the first required opening value for the second virtual switch.

[0071] Step c): Real-time acquisition of engine intake pressure, engine speed, and cyclic fuel injection quantity, and using engine speed and cyclic fuel injection quantity as indexes, look up the intake pressure threshold setting table to obtain the intake pressure threshold. If the engine intake pressure is less than the intake pressure threshold, a third signal is output to the second virtual switch, and the second virtual switch outputs the intermediate opening degree as the final set opening degree. If the engine intake pressure is greater than or equal to the intake pressure threshold, a fourth signal is output to the second virtual switch, and the second virtual switch outputs the second required opening degree as the final set opening degree to control the opening degree of the flow regulating valve 700 to the final set opening degree.

[0072] If the engine intake pressure is lower than the intake pressure threshold, it indicates that ice has formed at the intake heating device 600. In a short time, intake air will have difficulty entering the intake manifold 200 through the intake heating device 600 and will need to enter the intake manifold 200 through the second intake splitter pipe 500. At this time, the second virtual switch will output the intermediate opening degree as the final set opening degree. The intermediate opening degree is... Figure 3 The position b in the text.

[0073] If the engine intake pressure is greater than or equal to the intake pressure threshold, it means that the intake heating device at 600 is not frozen and the intake air can pass through here. At this time, the second virtual switch will output the second required opening degree as the final set opening degree. At this time, the valve plate can be positioned as needed at position a, position b, or any position between the minimum and maximum opening degree, such as position c.

[0074] This application also provides an engine that includes the intake system described in the above embodiments. Since the engine uses the intake system described in the above embodiments, the technical effects of the engine can be referred to the above embodiments.

[0075] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0076] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0077] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0078] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A control method of an intake system, characterized by, The intake system includes: Air intake pipe (100); The intake manifold (200) has multiple inlets and multiple outlets. Each outlet is connected to a cylinder of the engine block through an intake branch pipe (300). Each inlet is spaced apart along the arrangement direction of each outlet. An intake manifold assembly includes multiple parallel intake manifolds. The first end of each intake manifold is connected to the intake connector (100), and the second end of each intake manifold is connected to the inlet. The intake manifold assembly includes at least one first intake manifold (400) and at least one second intake manifold (500). An intake heating device (600) is installed in at least one first intake manifold (400), and a flow regulating valve (700) is installed in the intake connector (100) to allow for... Adjust the flow area between the intake pipe (100) and the first intake split pipe (400) and the second intake split pipe (500) to switch the intake system between three states: the intake pipe (100) is only connected to the first intake split pipe (400), the intake pipe (100) is only connected to the second intake split pipe (500), and the intake pipe (100) is connected to both the first intake split pipe (400) and the second intake split pipe (500). The control method for the intake system includes: Step a): Obtain the engine intake air flow in real time, use the engine intake air flow as an index to look up the flow control valve opening setting table, obtain the basic setting opening, and output the basic setting opening as the first required opening to the first virtual switch; Step b): Real-time acquisition of engine coolant temperature and intake air temperature. If the coolant temperature is less than the coolant temperature threshold or the intake air temperature is less than the intake air temperature threshold, a first signal is output to the first virtual switch. The first virtual switch outputs the minimum opening degree as the second required opening degree to the second virtual switch. The minimum opening degree is when the flow regulating valve (700) is in a state where the intake pipe (100) is only connected to the first intake split pipe (400). If the coolant temperature is greater than or equal to the coolant temperature threshold or the intake air temperature is greater than or equal to the intake air temperature threshold, a second signal is output to the first virtual switch. The first virtual switch outputs the first required opening degree as the second required opening degree to the second virtual switch. Step c): Real-time acquisition of engine intake pressure, engine speed and cyclic fuel injection quantity, and using engine speed and cyclic fuel injection quantity as indexes, look up the intake pressure threshold setting table to obtain the intake pressure threshold. If the engine intake pressure is less than the intake pressure threshold, output a third signal to the second virtual switch. The second virtual switch outputs the intermediate opening degree as the final set opening degree. The intermediate opening degree is the state in which the flow regulating valve (700) is in which the intake pipe (100) is only connected to the second intake split pipe (500). If the engine intake pressure is greater than or equal to the intake pressure threshold, output a fourth signal to the second virtual switch. The second virtual switch outputs the second required opening degree as the final set opening degree to control the opening degree of the flow regulating valve (700) to the final set opening degree.

2. The control method of the intake system according to claim 1, characterized by, The number of the first intake split pipe (400) is the same as the number of the second intake split pipe (500).

3. The control method of the intake system according to claim 2, characterized by, Each of the first intake manifolds (400) constitutes a first intake manifold group, and each of the second intake manifolds (500) constitutes a second intake manifold group. The first intake manifold group and the second intake manifold group are arranged at intervals along the cylinder arrangement direction of the engine body. Each of the first intake manifolds (400) in the first intake manifold group and each of the second intake manifolds (500) in the second intake manifold group are arranged at intervals along the cylinder arrangement direction of the engine body.

4. The control method of the intake system according to claim 2 or 3, characterized by, Each of the first intake manifolds (400) and each of the second intake manifolds (500) are symmetrically distributed about the geometric center of the engine block.

5. The control method of the intake system according to any one of claims 1-3, characterized by, The shape and size of the air intake pipe (100) are the same as those of the first air intake split pipe (400) and the second air intake split pipe (500). The flow regulating valve (700) includes a valve plate, a valve shaft and a drive mechanism. The shape and size of the valve plate are adapted to the shape and size of the air intake pipe (100) and the second air intake split pipe (500) at the connection point. One end of the valve plate is rotatably disposed at the intersection of the air intake pipe (100), the first air intake split pipe (400) and the second air intake split pipe (500) through the valve shaft. The drive mechanism is connected to the valve shaft to drive the valve plate to rotate between the minimum opening position and the maximum opening position. The minimum opening position is the position where the valve plate blocks the connection point between the air intake pipe (100) and the second air intake split pipe (500). The maximum opening position is the position where the valve plate rotates 180° to the left from the minimum opening position.

6. The control method of the intake system according to any one of claims 1-3, characterized by, The intake heating device (600) is an intake heating grille.

7. The control method of the intake system according to any one of claims 1-3, characterized by, The intake heating device (600) is located near the end of the first intake split pipe (400) that is connected to the intake manifold (200).

8. The control method of the intake system according to any one of claims 1-3, characterized by, The intake pipe (100) is connected to the EGR pipe (900) upstream of the intake manifold, and the intake pipe (100) is provided with an intake throttle valve (800) for adjusting the intake air volume upstream of the EGR pipe (900).

9. An engine characterized by, The intake system is controlled by the control method according to any one of claims 1 to 8.

Images