A control method and system for a turbocharger

Abstract

The present invention provides a control method and system for a turbocharger, the method comprising: obtaining a first operating parameter of an engine; based on the first operating parameter, opening or closing an adjustment component on a specific adjustment device, the specific adjustment device and the adjustment component being arranged at a short flow channel at a turbine end of a dual-flow channel turbocharger; when the adjustment component is opened, obtaining a second operating parameter of the engine and a pressure ratio of the dual-flow channel turbocharger; using the second operating parameter and the pressure ratio, adjusting a rotation angle of the adjustment component to adjust an airflow entering the dual-flow channel turbocharger, so that the gas entering a nozzle ring at the turbine end is more uniform, and the gas is accelerated in a direction of entering the nozzle ring at the turbine end, thereby improving the working efficiency of the dual-flow channel turbocharger.

Description

Technical Field

[0001] The present invention relates to the technical field of engines, and in particular to a control method and system for a turbocharger. Background Art

[0002] With the continuous upgrading of emission standards, the requirements for engine performance and economy are also increasing. Turbochargers are usually used to improve the aerodynamics of the engine.

[0003] The nozzle ring of the turbine end of the current turbocharger is circumferentially symmetrical, and the gas entering the impeller of the turbocharger is circumferentially asymmetric, which will lead to low work efficiency of the impeller and further lead to low working efficiency of the turbocharger. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a control method and system for a turbocharger to solve the problem of low working efficiency of the current turbocharger.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A first aspect of an embodiment of the present invention discloses a control method for a turbocharger, the method comprising:

[0007] Acquiring a first operating condition parameter of an engine, wherein the engine is equipped with a dual-flow turbocharger;

[0008] Based on the first operating condition parameter, turning on or off a regulating component on a specific regulating device, wherein the specific regulating device and the regulating component are arranged at a short flow channel at a turbine end of the dual-flow channel turbocharger;

[0009] When the regulating component is turned on, obtaining a second operating condition parameter of the engine and a pressure ratio of the dual-flow turbocharger;

[0010] The second operating condition parameter and the pressure ratio are used to adjust the rotation angle of the regulating component to adjust the airflow entering the dual-flow turbocharger.

[0011] Preferably, the first operating condition parameter includes exhaust temperature and intake air flow rate;

[0012] Based on the first operating condition parameter, turning on or off the regulating component on the specific regulating device includes:

[0013] Determining whether the exhaust temperature is higher than a temperature threshold, and determining whether the intake air flow rate is greater than a flow rate threshold;

[0014] If the exhaust temperature is higher than the temperature threshold, and if the intake air flow rate is greater than the flow rate threshold, opening a regulating component on a specific regulating device;

[0015] If the exhaust temperature is not higher than the temperature threshold, or if the intake air flow rate is not greater than the flow rate threshold, the regulating component is closed.

[0016] Preferably, the second operating condition parameter includes rotation speed and cyclic injection amount;

[0017] Using the second operating condition parameter and the pressure ratio, adjusting the rotation angle of the regulating component to adjust the airflow entering the dual-flow turbocharger includes:

[0018] Determining a basic set rotation angle based on the rotation speed and the cyclic injection amount;

[0019] Based on the pressure ratio, determining a rotation angle correction coefficient;

[0020] Calculating the product of the basic set rotation angle and the rotation angle correction coefficient to obtain an actual set rotation angle;

[0021] The rotation angle of the regulating component is adjusted to the actual set rotation angle to regulate the airflow entering the dual-flow turbocharger.

[0022] Preferably, determining a basic set rotation angle based on the rotation speed and the cyclic injection amount includes:

[0023] From the preset rotation angle MAP, the basic set rotation angle corresponding to the rotation speed and the cyclic injection amount is found.

[0024] Preferably, determining the rotation angle correction coefficient based on the pressure ratio includes:

[0025] The rotation angle correction coefficient corresponding to the pressure ratio is searched from a preset angle correction data table.

[0026] Preferably, the specific regulating device is a flow balancing valve, and the regulating component is a blade.

[0027] A second aspect of an embodiment of the present invention discloses a control system for a turbocharger, the system comprising:

[0028] A first acquisition unit, used for acquiring a first operating condition parameter of an engine, wherein the engine is equipped with a dual-flow turbocharger;

[0029] a control unit, configured to open or close a regulating component on a specific regulating device based on the first operating condition parameter, wherein the specific regulating device and the regulating component are arranged at a short flow channel at a turbine end of the dual-flow channel turbocharger;

[0030] a second acquisition unit, configured to acquire a second operating parameter of the engine and a pressure ratio of the dual-flow turbocharger when the adjustment component is turned on;

[0031] The adjustment unit is used to adjust the rotation angle of the adjustment component by using the second operating condition parameter and the pressure ratio to adjust the airflow entering the dual-flow turbocharger.

[0032] Preferably, the first operating condition parameter includes exhaust temperature and intake air flow; the control unit includes:

[0033] A judging subunit, used to judge whether the exhaust temperature is higher than a temperature threshold, and to judge whether the intake air flow rate is greater than a flow rate threshold;

[0034] an opening subunit, configured to open a regulating component on a specific regulating device if the exhaust temperature is higher than the temperature threshold and if the intake air flow rate is greater than the flow rate threshold;

[0035] The closing subunit is used to close the regulating component if the exhaust temperature is not higher than the temperature threshold, or if the intake air flow rate is not greater than the flow rate threshold.

[0036] Preferably, the second operating condition parameter includes a rotation speed and a cyclic injection amount; and the adjustment unit includes:

[0037] A first determination subunit, configured to determine a basic set rotation angle based on the rotation speed and the cyclic injection amount;

[0038] a second determining subunit, configured to determine a rotation angle correction coefficient based on the pressure ratio;

[0039] A calculation subunit, used for calculating the product of the basic set rotation angle and the rotation angle correction coefficient to obtain an actual set rotation angle;

[0040] The adjusting subunit is used to adjust the rotation angle of the adjusting component to the actual set rotation angle so as to adjust the airflow entering the dual-flow-channel turbocharger.

[0041] Preferably, the first determination subunit is specifically used to: search for a basic set rotation angle corresponding to the rotation speed and the cyclic injection amount from a preset rotation angle MAP.

[0042] Based on the above-mentioned embodiment of the present invention, a control method and system for a turbocharger is provided, the method is: obtaining a first operating parameter of the engine; based on the first operating parameter, opening or closing the regulating component on a specific regulating device, the specific regulating device and the regulating component are arranged in the short flow channel of the turbine end of the dual-flow channel turbocharger; when the regulating component is turned on, the second operating parameter of the engine and the pressure ratio of the dual-flow channel turbocharger are obtained; using the second operating parameter and the pressure ratio, the rotation angle of the regulating component is adjusted to adjust the airflow entering the dual-flow channel turbocharger. In this scheme, when the regulating component on the specific regulating device arranged in the short flow channel of the turbine end is determined to be turned on by the first operating parameter, the rotation angle of the regulating component is adjusted according to the second operating parameter of the engine and the pressure ratio of the dual-flow channel turbocharger, so that the gas entering the turbine end nozzle ring is more uniform, and the gas will be accelerated in the direction of entering the turbine end nozzle ring, thereby improving the working efficiency of the dual-flow channel turbocharger. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0044] Figure 1 An exemplary diagram of a conventional dual-flow-channel turbocharger provided in an embodiment of the present invention;

[0045] Figure 2 An example diagram of the internal flow field of a conventional dual-channel turbocharger provided in an embodiment of the present invention;

[0046] Figure 3 An example diagram of flow field analysis of an existing dual-channel turbocharger provided in an embodiment of the present invention;

[0047] Figure 4 An exemplary diagram of a dual-flow turbocharger provided in an embodiment of the present invention;

[0048] Figure 5 An example diagram of the state of the adjustment component provided by the embodiment of the present invention;

[0049] Figure 6 An exemplary diagram of the contact portion between the vortex end short flow channel and the vortex end nozzle ring provided in an embodiment of the present invention;

[0050] Figure 7 A flow chart of a control method for a turbocharger provided by an embodiment of the present invention;

[0051] Figure 8An example diagram of control logic of a control method for a turbocharger provided by an embodiment of the present invention;

[0052] Fig. 9 A structural block diagram of a control system for a turbocharger provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] In this application, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0055] Before explaining this solution, some terms are explained here to better understand the subsequent description.

[0056] Turbocharger: A device installed on the exhaust side of an engine (such as an internal combustion engine) and on the exhaust pipe to enhance aerodynamics; the turbocharger uses the inertial impact of the exhaust gas discharged by the engine to drive the turbine in the turbine chamber. The turbine drives the coaxial pressure wheel, which compresses the air sent from the air filter pipe. The compressed air enters the engine's intake cylinder and participates in the engine combustion.

[0057] The vortex nozzle ring of a turbocharger is an annular component composed of several exhaust guide vanes at the leading edge of the turbocharger turbine impeller. The main function of the vortex nozzle ring is to adjust the flow rate of the exhaust gas in the volute and guide the direction of the exhaust gas entering the impeller. The rationality of the gas flow field inside the vortex nozzle ring will directly affect the efficiency of the turbocharger vortex end.

[0058] Turbocharger volute: There is a gas flow channel inside. The exhaust gas discharged from the exhaust manifold passes through the flow channel inside the turbocharger volute. The gas passes through the nozzle ring at the vortex end and enters the impeller to participate in work.

[0059] With the continuous upgrading of emission standards, the requirements for engine performance and economy are also increasing. Turbochargers are usually used to improve the aerodynamics of the engine.

[0060] The inventor has found through research that the current dual-flow channel turbocharger has problems such as "flow channel non-uniformity" and "circumferential asymmetry of the impeller of the gas entering the turbocharger". The specific research contents are as follows:

[0061] like Figure 1 As shown in the example diagram of the existing dual-flow turbocharger, the existing dual-flow turbocharger is composed of a compressor 101, an intermediate body 102 and a turbine 103. Figure 1 1031 in the figure is the turbine export. Figure 1 Reference numeral 1032 denotes a turbine inlet.

[0062] Figure 1 The conventional dual-flow turbocharger shown is generally adapted for use in engines with a relatively large gas flow rate. The internal flow field of the conventional dual-flow turbocharger is as shown in FIG. Figure 2 As shown;

[0063] The internal flow field of the existing dual-flow channel turbocharger is composed of four parts: a long flow channel 201 at the vortex end, a short flow channel 202 at the vortex end, a nozzle ring 203 at the vortex end, and a turbine 204;

[0064] The gas in the vortex end long flow channel 201 needs to flow 360 degrees around the vortex end nozzle ring 203, flow out through the contact surface between the vortex end long flow channel 201 and the vortex end nozzle ring 203, and enter the vortex end nozzle ring 203;

[0065] The gas in the vortex end short flow channel 202 needs to flow around the vortex end nozzle ring 203 for 180 degrees, flow out through the contact surface between the vortex end short flow channel 202 and the vortex end nozzle ring 203, and enter the vortex end nozzle ring 203.

[0066] Regarding the above Figure 1 and Figure 2 It can be seen from the related contents of the existing dual-flow turbocharger that the existing dual-flow turbocharger has the following problems:

[0067] Problem 1: Non-uniformity of flow channel:

[0068] 1) The inlet of the long flow channel at the vortex end and the short flow channel at the vortex end are the same;

[0069] 2) The gas in the long flow channel at the vortex end and the short flow channel at the vortex end respectively circles the vortex end nozzle ring 360 degrees and 180 degrees, so the losses of the two are different, which leads to the asymmetry of the gas entering the vortex end nozzle ring from the long flow channel at the vortex end and the short flow channel at the vortex end;

[0070] 3) The cross-section of the volute outlet is the same as that of the volute inlet, but the flow path lengths of the two are different, which leads to different cross-sectional change rates and different fluid flow conditions;

[0071] 4) After simulation verification, the flow field analysis of the existing dual-channel turbocharger is as follows Figure 3 As shown, before entering the vortex end nozzle ring, the gas flow states in the vortex end long flow channel and the vortex end short flow channel are not symmetrical.

[0072] Question 2: The nozzle ring at the turbine end is circumferentially symmetrical, but the gas entering the turbocharger's impeller is circumferentially asymmetric, which results in low impeller efficiency and, in turn, low turbocharger efficiency.

[0073] To solve the above problems, the present invention proposes a control method and system for a turbocharger, in which a specific regulating device and a regulating component are arranged in the short flow channel at the turbine end of the dual-flow channel turbocharger. When the regulating component on the specific regulating device is determined to be turned on through the first operating condition parameter, the rotation angle of the regulating component is adjusted according to the second operating condition parameter of the engine and the pressure ratio of the dual-flow channel turbocharger, so that the gas entering the turbine end nozzle ring is more uniform, and the gas is accelerated in the direction of entering the turbine end nozzle ring, thereby improving the working efficiency of the dual-flow channel turbocharger.

[0074] The structure of the dual-flow turbocharger provided in this solution is as follows Figure 4 As shown, Figure 4 In the embodiment, the dual-flow turbocharger provided by the present invention is composed of four parts: a turbine 401, a specific regulating device 402, an intermediate body 403 and a compressor 404. The specific regulating device 402 is provided with a regulating component;

[0075] The specific regulating device 402 may be a flow balancing valve (or a flow regulating valve), and the regulating component on the specific regulating device 402 may be a blade (or a valve plate).

[0076] In this solution, the engine electronic control unit (ECU) controls the specific regulating device 402, and the specific regulating device 402 controls the rotation angle (opening) of the regulating component;

[0077] The opening and closing states of the regulating components on the specific regulating device 402 are as follows: Figure 5 As shown, Figure 5 The regulating component shown in is a blade; Figure 5 The closed state of the regulating component is shown, and the open state of the regulating component is shown in which the regulating component is opened to a certain degree (adjusted to a certain rotation angle) under the control of the specific regulating device 402.

[0078] For the above Figure 4 and Figure 5The dual-channel turbocharger provided by the present scheme shown has the same inlet area and outlet area as the short channel at the vortex end and the long channel at the vortex end, so the gas flow path of the short channel at the vortex end is shorter, which will cause the pipe diameter of the short channel at the vortex end to change more dramatically, and thus make the gas flow rate of the short channel at the vortex end change more dramatically. Therefore, the present scheme arranges a specific regulating device 402 on the short channel at the vortex end to control the gas flow balance, that is, the specific regulating device 402 and the regulating component are arranged on one side of the short channel at the vortex end of the dual-channel turbocharger.

[0079] More specifically, the specific regulating device 402 and the regulating components controlled by it are located at the front end portion where the vortex end short flow passage contacts the vortex end nozzle ring, such as Figure 6 As shown in the example diagram of the contact part between the vortex end short flow channel and the vortex end nozzle ring, it can be seen that for the vortex end short flow channel, the vortex end short flow channel can be divided into two parts: the inlet section and the vortex end nozzle ring flow outflow section, wherein the inlet section is between the vortex end inlet and the vortex end nozzle ring flow outflow section inlet;

[0080] The contact portion between the vortex end short flow channel and the vortex end nozzle ring is the outflow section of the vortex end nozzle ring; the regulating component on the specific regulating device 402 is located at the front end of the outflow section of the vortex end nozzle ring in the gas flow direction.

[0081] Based on the above Figures 4 to 6 It can be seen from the shown content that when the regulating component on the specific regulating device 402 is closed, the regulating component is completely hidden inside the turbine end casing; when the regulating component is opened to a certain degree (opened and adjusted to a certain rotation angle), the speed at which the gas flows into the turbine end nozzle ring at the regulating component is accelerated, thereby achieving the purpose of circumferential balance of the gas flowing into the turbine end nozzle ring.

[0082] above Figures 4 to 6 The content is the relevant description of the dual-flow turbocharger provided by this solution;

[0083] See also Figure 7 , shows a flow chart of a control method for a turbocharger provided by an embodiment of the present invention, the control method is applied to an engine ECU, and the control method includes:

[0084] Step S701: Obtain the first operating condition parameter of the engine.

[0085] It should be noted that the engine is equipped with a dual-channel turbocharger. The specific content of the dual-channel turbocharger can be found in the above-mentioned embodiment of the present invention. Figures 4 to 6 The relevant description will not be repeated here.

[0086] In the specific implementation of step S701, the current first operating condition parameter of the engine is obtained in real time, and the first operating condition parameter includes exhaust temperature and intake air flow; the adjustment component on the specific adjustment device is turned on or off according to the current first operating condition parameter.

[0087] That is, the current exhaust temperature and intake air flow of the engine are obtained, and the opening or closing of the regulating component is determined according to the current exhaust temperature and intake air flow.

[0088] Step S702: based on the first operating condition parameter, turning on or off the regulating component on the specific regulating device.

[0089] It should be noted that the specific regulating device and regulating component are arranged in the short flow channel of the turbine end of the dual-flow channel turbocharger. The specific contents of the specific regulating device and regulating component can be referred to in the above-mentioned embodiment of the present invention. Figures 4 to 6 The relevant description will not be repeated here.

[0090] In some embodiments, the specific regulating device is a flow balancing valve, and the regulating component is a blade; the number of regulating components on the specific regulating device can be one or more, and the number of the regulating components is not specifically limited.

[0091] In the specific implementation of step S702, it is determined whether the exhaust temperature is higher than the temperature threshold, and whether the intake air flow rate is greater than the flow rate threshold;

[0092] If the exhaust temperature is higher than the temperature threshold, and if the intake air flow rate is higher than the flow rate threshold, opening the regulating component on the specific regulating device;

[0093] If the exhaust temperature is not higher than the temperature threshold, or, if the intake air flow is not greater than the flow threshold, the regulating component is closed.

[0094] That is, if the exhaust temperature of the engine is higher than the temperature threshold and the intake air flow of the engine is higher than the flow threshold, the regulating component on the specific regulating device is turned on;

[0095] On the contrary, if the exhaust temperature of the engine is not higher than the temperature threshold, or if the intake air flow of the engine is not greater than the flow threshold, the regulating component on the specific regulating device is closed.

[0096] When the adjustment component on the specific adjustment device is turned on, step S703 is executed.

[0097] Step S703: When the regulating component is turned on, the second operating condition parameter of the engine and the pressure ratio of the dual-flow turbocharger are obtained.

[0098] In the specific implementation of step S703, when the regulating component on the specific regulating device is turned on, the second operating condition parameter of the engine is obtained, and the pressure ratio of the dual-flow turbocharger is obtained, wherein the second operating condition parameter includes the rotation speed and the cyclic injection amount.

[0099] The rotation angle of the regulating component is determined by the second operating condition parameter and the pressure ratio of the dual-channel turbocharger, that is, the rotation angle of the regulating component is determined by the engine speed, the cyclic injection amount of the engine, and the pressure ratio of the dual-channel turbocharger.

[0100] It should be noted that the pressure ratio of a dual-flow turbocharger refers to the ratio of the pressure after supercharging to the pressure before supercharging.

[0101] Step S704: using the second operating condition parameter and the pressure ratio, adjusting the rotation angle of the regulating component to adjust the airflow entering the dual-flow-channel turbocharger.

[0102] In the process of implementing step S704, the rotation angle of the regulating component is adjusted by utilizing the second operating condition parameter of the engine and the pressure ratio of the dual-channel turbocharger, thereby adjusting the airflow entering the dual-channel turbocharger, so that the gas entering the turbine end nozzle ring is more uniform, and the gas is accelerated in the direction of entering the turbine end nozzle ring, thereby improving the working efficiency of the dual-channel turbocharger.

[0103] It should be noted that when the engine ECU adjusts the rotation angle of the adjustment component on the specific adjustment device, the engine ECU can adjust the rotation angle of the adjustment component by controlling the specific adjustment device.

[0104] Specifically, the specific method of adjusting the rotation angle of the regulating component is: based on the rotation speed and the cyclic injection amount, determine the basic set rotation angle; based on the pressure ratio, determine the rotation angle correction coefficient; calculate the product of the basic set rotation angle and the rotation angle correction coefficient to obtain the actual set rotation angle; adjust the rotation angle of the regulating component to the actual set rotation angle to adjust the airflow entering the dual-flow turbocharger.

[0105] In some embodiments, the specific method of determining the basic set rotation angle is: searching the basic set rotation angle corresponding to the rotation speed and the cyclic injection amount from the preset rotation angle MAP.

[0106] The rotation angle MAP includes the basic set rotation angles corresponding to different "speed-cycle injection amount" combinations.

[0107] After obtaining the engine speed and cyclic injection amount, the rotation angle MAP is searched according to the obtained "speed-cyclic injection amount" combination, so as to find the basic set rotation angle corresponding to the obtained "speed-cyclic injection amount" combination.

[0108] In some embodiments, the specific implementation method of determining the rotation angle correction coefficient is: searching for the rotation angle correction coefficient corresponding to the pressure ratio from a preset angle correction data table.

[0109] It should be noted that the angle correction data table is also called the angle correction CUR. The angle correction CUR is a one-dimensional data table. The angle correction CUR is stored in the engine ECU and includes rotation angle correction coefficients corresponding to different pressure ratios.

[0110] It can be seen from the above embodiments that when the adjusting component on a specific adjusting device is turned on, the basic set rotation angle is found from the rotation angle MAP through the engine speed and the cyclic injection amount, and the rotation angle correction coefficient corresponding to the pressure ratio is found from the angle correction data table through the pressure ratio of the dual-flow turbocharger.

[0111] After obtaining the basic set rotation angle and the rotation angle correction coefficient, the actual set rotation angle = basic set rotation angle * rotation angle correction coefficient;

[0112] The rotation angle of the regulating component is adjusted to the calculated actual set rotation angle, thereby regulating the airflow entering the dual-flow turbocharger.

[0113] In an embodiment of the present invention, when the adjustment component on the specific adjustment device arranged on the short flow channel of the turbine end is determined to be opened through the first operating condition parameter, the rotation angle of the adjustment component is adjusted according to the second operating condition parameter of the engine and the pressure ratio of the dual-channel turbocharger, so that the gas entering the turbine end nozzle ring is more uniform, and the gas is accelerated in the direction of entering the turbine end nozzle ring, thereby improving the working efficiency of the dual-channel turbocharger.

[0114] To better understand the above embodiments of the present invention Figure 7 The content of this article takes the blade as an example of the regulating part on a specific regulating device. Figure 8 An example control logic diagram of a control method for a turbocharger is shown for illustration.

[0115] like Figure 8 It can be seen from the shown content that if the exhaust temperature of the engine is not higher than the temperature threshold, or if the intake flow of the engine is not greater than the flow threshold, the blade on the specific regulating device is closed (that is, the rotation angle of the blade is 0); if the exhaust temperature of the engine is higher than the temperature threshold and the intake flow of the engine is greater than the flow threshold, the regulating component on the specific regulating device is opened.

[0116] in, Figure 8 The 240 is the temperature threshold and the 200 is the flow threshold.

[0117] It should be noted that for Figure 8 In the "AND" logic block, if the exhaust temperature of the engine is not higher than the temperature threshold, or if the intake flow of the engine is not greater than the flow threshold, then the "AND" logic block outputs 0; conversely, if the exhaust temperature of the engine is higher than the temperature threshold and the intake flow of the engine is greater than the flow threshold, then the "AND" logic block outputs 1.

[0118] for Figure 8 In the "switch" logic block, if the "AND" logic block outputs 0, the switch of the "switch" logic block is closed upward, and the rotation angle of the blade is 0 (i.e. the blade is closed), which is equivalent to the actual setting of the rotation angle value to 0;

[0119] When the actual set rotation angle is 0, the blade is closed by adjusting the rotation angle of the blade to the actual set rotation angle.

[0120] If the "AND" logic block outputs 1, the switch of the "switch" logic block is closed downward to open the vane. At this time, the actual set rotation angle of the opened vane is determined according to the engine speed, the engine's cyclic injection amount, and the pressure ratio of the dual-flow turbocharger;

[0121] Specifically, the rotation angle MAP is found according to the engine speed and the cyclic injection amount, so as to find the basic set rotation angle; the angle correction CUR is found according to the pressure ratio of the dual-channel turbocharger, so as to find the rotation angle correction coefficient; the actual set rotation angle at this time = basic set rotation angle * rotation angle correction coefficient; the rotation angle of the blade is adjusted to the calculated actual set rotation angle.

[0122] The above is an example of this solution. In practical application, this solution can achieve the following beneficial effects:

[0123] The gas entering the nozzle ring at the vortex end is made more uniform, which improves the working efficiency of the dual-channel turbocharger. Under certain working conditions, when the regulating component (vane) is opened to a certain degree, the flow channel cross-section will become smaller, so that the gas will be accelerated in the direction of entering the nozzle ring at the vortex end.

[0124] In general, this solution can effectively optimize the gas flow inside the twin-flow turbocharger volute, thereby improving the working efficiency of the twin-flow turbocharger and bringing better economic performance and power performance to the engine.

[0125] Corresponding to the control method for a turbocharger provided in the above embodiment of the present invention, see Fig. 9, the embodiment of the present invention also provides a structural block diagram of a control system for a turbocharger, the control system is applied to an engine ECU, the control system includes: a first acquisition unit 901, a control unit 902, a second acquisition unit 903 and an adjustment unit 904;

[0126] The first acquisition unit 901 is used to acquire a first operating parameter of an engine, where the engine is equipped with a dual-flow turbocharger.

[0127] The control unit 902 is used to open or close the regulating component on the specific regulating device based on the first operating condition parameter, and the specific regulating device and the regulating component are arranged in the short flow channel of the turbine end of the dual-flow channel turbocharger.

[0128] In some embodiments, the specific regulating device is a flow balancing valve, and the regulating component is a blade.

[0129] The second acquisition unit 903 is used to acquire the second operating condition parameter of the engine and the pressure ratio of the dual-flow turbocharger when the adjustment component is turned on.

[0130] The adjustment unit 904 is used to adjust the rotation angle of the adjustment component by using the second operating condition parameter and the pressure ratio, so as to adjust the airflow entering the dual-flow turbocharger.

[0131] In an embodiment of the present invention, when the adjustment component on the specific adjustment device arranged on the short flow channel of the turbine end is determined to be opened through the first operating condition parameter, the rotation angle of the adjustment component is adjusted according to the second operating condition parameter of the engine and the pressure ratio of the dual-channel turbocharger, so that the gas entering the turbine end nozzle ring is more uniform, and the gas is accelerated in the direction of entering the turbine end nozzle ring, thereby improving the working efficiency of the dual-channel turbocharger.

[0132] Preferably, combined Fig. 9 The content shown, the first operating condition parameter includes exhaust temperature and intake air flow, the control unit 902 includes a judgment subunit, an opening subunit and a closing subunit, and the execution principle of each subunit is as follows:

[0133] The judgment subunit is used to judge whether the exhaust temperature is higher than the temperature threshold and whether the intake air flow rate is greater than the flow rate threshold.

[0134] The opening subunit is used to open the regulating component on the specific regulating device if the exhaust temperature is higher than the temperature threshold and if the intake air flow is greater than the flow threshold.

[0135] The closing subunit is used to close the regulating component if the exhaust temperature is not higher than the temperature threshold, or if the intake air flow is not greater than the flow threshold.

[0136] Preferably, combined Fig. 9The content shown, the second operating condition parameters include the speed and the cyclic injection amount; the adjustment unit 904 includes: a first determination subunit, a second determination subunit, a calculation subunit and an adjustment subunit; the execution principle of each subunit is as follows:

[0137] The first determination subunit is used to determine a basic set rotation angle based on the rotation speed and the cyclic injection amount.

[0138] In a specific implementation, the first determination subunit is specifically used to: search for a basic set rotation angle corresponding to the rotation speed and the cyclic injection amount from a preset rotation angle MAP.

[0139] The second determining subunit is used to determine the rotation angle correction coefficient based on the pressure ratio.

[0140] In a specific implementation, the second determining subunit is specifically used to: search for a rotation angle correction coefficient corresponding to the pressure ratio from a preset angle correction data table.

[0141] The calculation subunit is used to calculate the product of the basic set rotation angle and the rotation angle correction coefficient to obtain the actual set rotation angle.

[0142] The adjusting subunit is used to adjust the rotation angle of the adjusting component to the actual set rotation angle so as to adjust the airflow entering the dual-flow-channel turbocharger.

[0143] In summary, an embodiment of the present invention provides a control method and system for a turbocharger. When the regulating component on a specific regulating device arranged on the short flow channel of the turbine end is determined to be opened through the first operating parameter, the rotation angle of the regulating component is adjusted according to the second operating parameter of the engine and the pressure ratio of the dual-channel turbocharger, so that the gas entering the turbine end nozzle ring is more uniform, and the gas is accelerated in the direction of entering the turbine end nozzle ring, thereby improving the working efficiency of the dual-channel turbocharger.

[0144] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can refer to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiment. The system and system embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without creative work.

[0145] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0146] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for a turbocharger, It is characterized in that The method comprises: Acquiring a first operating condition parameter of an engine, wherein the engine is equipped with a dual-flow turbocharger; Based on the first operating condition parameter, a regulating component on a specific regulating device is turned on or off, wherein the specific regulating device and the regulating component are arranged in the short flow channel of the turbine end of the dual-flow channel turbocharger; when the regulating component is turned off, the regulating component is completely hidden inside the turbine end housing; When the regulating component is turned on, obtaining a second operating condition parameter of the engine and a pressure ratio of the dual-flow turbocharger; adjusting the rotation angle of the regulating component by using the second operating condition parameter and the pressure ratio to adjust the airflow entering the dual-flow-channel turbocharger; The first operating condition parameters include exhaust temperature and intake air flow rate; Based on the first operating condition parameter, turning on or off the regulating component on the specific regulating device includes: Determining whether the exhaust temperature is higher than a temperature threshold, and determining whether the intake air flow rate is greater than a flow rate threshold; If the exhaust temperature is higher than the temperature threshold, and if the intake air flow rate is greater than the flow rate threshold, opening a regulating component on a specific regulating device; If the exhaust temperature is not higher than the temperature threshold, or if the intake air flow rate is not greater than the flow rate threshold, the regulating component is closed.

2. The method according to claim 1, It is characterized in that The second operating condition parameters include rotation speed and cyclic injection amount; Using the second operating condition parameter and the pressure ratio, adjusting the rotation angle of the regulating component to adjust the airflow entering the dual-flow turbocharger includes: Determining a basic set rotation angle based on the rotation speed and the cyclic injection amount; Based on the pressure ratio, determining a rotation angle correction coefficient; Calculating the product of the basic set rotation angle and the rotation angle correction coefficient to obtain an actual set rotation angle; The rotation angle of the regulating component is adjusted to the actual set rotation angle to regulate the airflow entering the dual-flow turbocharger.

3. The method according to claim 2, It is characterized in that Based on the rotation speed and the cyclic injection amount, determining a basic set rotation angle includes: From the preset rotation angle MAP, the basic set rotation angle corresponding to the rotation speed and the cyclic injection amount is found.

4. The method according to claim 2, It is characterized in that Based on the pressure ratio, a rotation angle correction coefficient is determined, including: The rotation angle correction coefficient corresponding to the pressure ratio is searched from a preset angle correction data table.

5. The method according to any one of claims 1 to 4, It is characterized in that The specific regulating device is a flow balancing valve, and the regulating component is a blade.

6. A control system for a turbocharger, It is characterized in that The system comprises: A first acquisition unit, used to acquire a first operating condition parameter of an engine, wherein the engine is equipped with a dual-flow turbocharger; a control unit, configured to open or close a regulating component on a specific regulating device based on the first operating condition parameter, wherein the specific regulating device and the regulating component are arranged in a short flow channel at a turbine end of the dual-flow-channel turbocharger; when the regulating component is closed, the regulating component is completely hidden inside a turbine end housing; a second acquisition unit, configured to acquire a second operating parameter of the engine and a pressure ratio of the dual-flow turbocharger when the adjustment component is turned on; an adjusting unit, configured to adjust a rotation angle of the adjusting component by using the second operating condition parameter and the pressure ratio, so as to adjust an airflow entering the dual-flow-channel turbocharger; The first operating condition parameter includes exhaust temperature and intake air flow; the control unit includes: A judging subunit, used to judge whether the exhaust temperature is higher than a temperature threshold, and to judge whether the intake air flow rate is greater than a flow rate threshold; an opening subunit, configured to open a regulating component on a specific regulating device if the exhaust temperature is higher than the temperature threshold and if the intake air flow rate is greater than the flow rate threshold; The closing subunit is used to close the regulating component if the exhaust temperature is not higher than the temperature threshold, or if the intake air flow rate is not greater than the flow rate threshold.

7. The system according to claim 6, It is characterized in that The second operating condition parameter includes a rotation speed and a cyclic injection amount; the adjustment unit includes: A first determination subunit, configured to determine a basic set rotation angle based on the rotation speed and the cyclic injection amount; a second determining subunit, configured to determine a rotation angle correction coefficient based on the pressure ratio; A calculation subunit, used for calculating the product of the basic set rotation angle and the rotation angle correction coefficient to obtain an actual set rotation angle; The adjusting subunit is used to adjust the rotation angle of the adjusting component to the actual set rotation angle so as to adjust the airflow entering the dual-flow-channel turbocharger.

8. The system according to claim 7, It is characterized in that The first determination subunit is specifically used to find the basic set rotation angle corresponding to the rotation speed and the cyclic injection amount from the preset rotation angle MAP.

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