CN115506881A - Engine supercharging system, control method and vehicle - Google Patents

Engine supercharging system, control method and vehicle Download PDF

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Publication number
CN115506881A
CN115506881A CN202211189570.0A CN202211189570A CN115506881A CN 115506881 A CN115506881 A CN 115506881A CN 202211189570 A CN202211189570 A CN 202211189570A CN 115506881 A CN115506881 A CN 115506881A
Authority
CN
China
Prior art keywords
engine
turbocharger
air
valve
mechanical supercharger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211189570.0A
Other languages
Chinese (zh)
Inventor
张威
刘伟
张坦志
李德胜
刘燕
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weichai Power Co Ltd
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Weichai Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Weichai Power Co Ltd filed Critical Weichai Power Co Ltd
Priority to CN202211189570.0A priority Critical patent/CN115506881A/en
Publication of CN115506881A publication Critical patent/CN115506881A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/04—Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/007—Engines characterised by provision of pumps driven at least for part of the time by exhaust with exhaust-driven pumps arranged in parallel, e.g. at least one pump supplying alternatively
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/013—Engines characterised by provision of pumps driven at least for part of the time by exhaust with exhaust-driven pumps arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/12—Control of the pumps
    • F02B37/14—Control of the alternation between or the operation of exhaust drive and other drive of a pump, e.g. dependent on speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

The embodiment of the application provides an engine supercharging system, a control method and a vehicle, and relates to the technical field of superchargers, wherein the engine supercharging system comprises an engine, a plurality of turbochargers, a mechanical supercharger, a first valve, an air filter and an Electronic Control Unit (ECU); the turbocharger comprises a plurality of turbochargers, a plurality of air compressors and a plurality of air compressors, wherein the turbochargers are connected in series and/or in parallel, the turbine of a first turbocharger is connected with an exhaust manifold of an engine, and an exhaust port of the air compressor of the first turbocharger is connected with an air inlet of a mechanical supercharger; the air inlet of the mechanical supercharger is connected with the air filter, and the air outlet of the mechanical supercharger is connected with the air inlet main pipe of the engine; the exhaust port of the compressor of the first turbocharger is also connected with the exhaust port of the mechanical supercharger through a first valve; when the rotating speed of the engine is lower than a set threshold value, the ECU controls the operation of the mechanical supercharger, so that the supercharging effect of the engine at high and low rotating speeds can be effectively considered, and the low-speed responsiveness of the engine can be effectively improved.

Description

Engine supercharging system, control method and vehicle
Technical Field
The application relates to the technical field of superchargers, in particular to an engine supercharging system, a control method and a vehicle.
Background
In order to improve the power of the engine, reduce the oil consumption and control the exhaust emission, the engine is generally provided with a turbocharger, but the single turbocharger has better supercharging effect in the high-speed section of the engine, but has particularly poor supercharging effect in the low-speed section of the engine.
To solve the above problems, the existing turbochargers usually adopt two-stage turbocharging, i.e. two turbochargers in series with one larger turbocharger and one smaller turbocharger or two identical turbochargers in parallel. However, although the high and low rotation speeds of the engine are considered at the same time, the matching of the turbocharger is difficult, and the power increase is limited when the engine rotates at a low rotation speed, so that the performance of the engine under the whole operation condition is greatly influenced.
Disclosure of Invention
The embodiment of the application provides an engine supercharging system, a control method and a vehicle, and is used for solving the problem that the engine supercharging system in the prior art cannot simultaneously give consideration to the supercharging effect of an engine at a low rotating speed.
The embodiment of the application provides an engine supercharging system, includes: the engine, a plurality of turbo chargers, the mechanical supercharger, a first valve, an air cleaner and an Electronic Control Unit (ECU), wherein:
the engine comprises an air inlet main pipe and an exhaust main pipe;
the turbochargers are connected in series and/or in parallel, wherein the air inlet of the turbine of the first turbocharger is directly connected with the exhaust manifold of the engine, and the air outlet of the compressor of the first turbocharger is connected with the air inlet of the mechanical supercharger;
the air inlet of the mechanical supercharger is also connected with the air filter, and the air outlet of the mechanical supercharger is connected with the air inlet main pipe of the engine;
the exhaust port of the compressor of the first turbocharger is also connected with the exhaust port of the mechanical supercharger through the first valve, and the first valve is opened when the air pressure of the exhaust port of the compressor of the first turbocharger is greater than that of the exhaust port of the mechanical supercharger;
the ECU is connected to the engine and the supercharger, and controls the operation of the supercharger when the engine speed is lower than a set threshold value.
According to the engine supercharging system, the mechanical supercharger, the plurality of turbochargers and the valve are combined to form a novel supercharging structure, the supercharging effect of the engine at high and low rotating speeds can be effectively considered, and the low-speed responsiveness of the engine is effectively improved.
In an alternative embodiment, the plurality of turbochargers in the engine supercharging system include the first turbocharger and the second turbocharger;
the first turbocharger and the second turbocharger are connected in series;
an air inlet of the compressor of the first turbocharger is connected to the air cleaner, and an air inlet of the compressor of the second turbocharger is connected to the air cleaner.
In an alternative embodiment, the engine boosting system further comprises a second valve;
an air inlet of an air compressor of the first turbocharger is connected with the air filter through the second valve;
the second valve is opened when the air pressure after the air cleaner is greater than the air pressure at the air inlet of the compressor of the first turbocharger.
In an alternative embodiment, the engine boosting system further comprises a third valve;
an air inlet of the supercharger is connected to the air cleaner through the third valve;
the third valve is opened when the air pressure after the air cleaner is greater than the air pressure of the air intake of the supercharger.
In an alternative embodiment, the engine supercharging system further comprises an inter-stage intercooler:
and the air inlet of the compressor of the first turbocharger is connected with the air outlet of the compressor of the second turbocharger through the interstage intercooler.
In an optional embodiment, the engine supercharging system further comprises a transmission mechanism;
the mechanical supercharger is connected with the engine body through the transmission mechanism;
and the ECU controls the engine to drive the mechanical supercharger to operate through the transmission mechanism when the rotating speed of the engine is lower than a set threshold value.
In an optional implementation, the engine supercharging system further comprises a main intercooler;
the main intercooler is connected between the exhaust port of the supercharger and the intake manifold of the engine.
In an optional embodiment, the engine boosting system further comprises a clutch;
the clutch is connected with the mechanical supercharger;
the clutch is integrated with the supercharger or is arranged independently.
The embodiment of the application provides a control method of an engine supercharging system, which is applied to an ECU of the engine supercharging system and comprises the following steps:
monitoring the rotating speed of an engine in real time, and determining whether the rotating speed of the engine is lower than a set threshold value;
when the rotating speed of the engine is determined to be lower than the set threshold value, controlling the mechanical supercharger to operate;
and controlling the mechanical supercharger to stop running when the rotation speed of the engine is determined not to be lower than the set threshold value.
The embodiment of the application provides a vehicle, which comprises the engine supercharging system.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of an engine supercharging system according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a plurality of turbochargers in a parallel connection manner in an engine supercharging system according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart illustrating a method for controlling a supercharging system of an engine according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of an engine supercharging system provided by an embodiment of the present application at engine start;
FIG. 5 is a schematic structural diagram of an engine supercharging system provided by an embodiment of the present application when the engine operates at a low rotational speed;
FIG. 6 is a schematic structural diagram of an engine supercharging system provided by an embodiment of the present application when the engine runs at a high speed.
Reference numerals:
1. an engine body; 2. an intake manifold; 3. an exhaust manifold;
4. a first turbocharger; 5. an interstage bleed duct; 6. a second turbocharger;
7. a tail pipe; 8. an interstage intercooler; 9. a gas inlet connecting pipe is arranged at the rear part of the filter;
10. an air cleaner; 11. a second valve; 12. a third valve;
13. a first valve; 14. a mechanical supercharger; 15. a transmission mechanism;
16. a main intercooler; 17. an air inlet connecting pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.
In order to improve the power of the engine, reduce the oil consumption and control the exhaust emission, the engine is generally provided with a turbocharger, but the single turbocharger has better supercharging effect in the high-speed section of the engine, but has particularly poor supercharging effect in the low-speed section of the engine.
To solve the above problems, the existing turbochargers usually adopt two-stage turbocharging, i.e. connecting two turbochargers in series, one larger turbocharger and one smaller turbocharger, or connecting two same turbochargers in parallel. However, although this method also considers the high and low rotation speeds of the engine, the matching of the high and low pressure turbochargers used is difficult, the turbine of the high pressure stage turbocharger cannot be too small, and a large intake air amount cannot be provided near the low speed or idle point of the engine, so that the engine generates large power and torque.
In addition, the scheme of combining the conventional mechanical supercharger and the first-stage turbocharger cannot give consideration to the supercharging ratio of the engine at high rotating speed, otherwise, the mechanical supercharger can be obviously interrupted when being introduced and withdrawn.
In order to solve the above problems and improve the supercharging effect of the engine at high and low rotation speeds, the embodiment of the application provides an engine supercharging system, which forms a new supercharging structure by combining a mechanical supercharger, a plurality of turbochargers and a valve, can effectively take account of the supercharging effect of the engine at high and low rotation speeds, and effectively improves the low-speed responsiveness of the engine.
Fig. 1 is a schematic structural diagram of an engine supercharging system according to an embodiment of the present application, and it should be noted that fig. 1 only shows an example in which only two turbochargers are included in the engine supercharging system, and other structural forms of the engine supercharging system in other structures are similar to that of the engine supercharging system in other structures, and reference may be made to the structural diagram shown in fig. 1. As shown in fig. 1, an engine supercharging system provided by an embodiment of the present application includes: an engine, a plurality of turbochargers, a supercharger 14, a first valve 13, an air cleaner 10 and an ECU, wherein:
the engine comprises an intake manifold 2 and an exhaust manifold 3; the engine further includes an engine body 1. The gas required for engine operation enters the engine through the intake manifold 2 and, when the engine is operating, the exhaust gas produced is discharged through the exhaust manifold 3.
The plurality of turbochargers are connected in series and/or in parallel; the number of turbochargers in the engine supercharging system is not limited in the embodiment of the application, and can be adjusted according to the actual requirements in specific implementation, and the connection mode of the turbochargers in the engine supercharging system is not limited in the embodiment of the application. A plurality of turbochargers can be connected in series, and the specific connection method can be seen in a first turbocharger 4 and a second turbocharger 6 in FIG. 1; the turbocharger and the turbocharger can also be connected in parallel, the specific connection structure can be seen in fig. 2, a schematic structure of the parallel connection of only two turbochargers is given in fig. 2 for convenience of explanation, the parallel connection of 3 and more turbochargers is similar in structure, specifically, the air inlets of a plurality of turbocharger turbines (one side marked with T in the figure) are connected with each other and connected with an exhaust manifold 3 of the engine, the air outlets of the turbines are connected with an exhaust tail pipe, the air inlets of a plurality of turbocharger compressors (one side marked with C in the figure) are connected with each other and connected with an air cleaner 10, and the air outlets of the compressors are connected with each other and then connected with other devices; in addition, the plurality of turbochargers can also be connected in series by part of the turbochargers and connected in parallel by part of the turbochargers.
The above turbochargers include the first turbocharger 4, the first turbocharger 4 is a turbocharger in which the air inlet of the turbine is directly connected with the exhaust manifold 3 of the engine, and when there are a plurality of turbochargers connected in parallel and the air inlet of the turbine is directly connected with the exhaust outlet of the engine, any one of the turbochargers can be selected as the first turbocharger 4;
in an alternative embodiment, as shown in fig. 1, the plurality of turbochargers in the engine supercharging system provided in the embodiment of the present application include the above-described first turbocharger 4 and second turbocharger 6;
the first turbocharger 4 and the second turbocharger 6 are connected in series;
specifically, the intake port of the turbine of the first turbocharger 4 is directly connected to the exhaust manifold 3 of the engine, and the exhaust port of the turbine of the first turbocharger 4 is connected to the intake port of the second turbocharger 6, and it should be noted that the first turbocharger 4 is a high-pressure stage turbocharger and the second turbocharger 6 is a low-pressure stage turbocharger, in which the turbine of the first turbocharger 4 is small and the turbine of the second turbocharger 6 is large.
When the engine runs at a rotating speed (middle or low rotating speed) lower than a preset threshold value, the exhaust gas enters the air inlet of the turbine of the first turbocharger 4 through the exhaust manifold 3, pushes the turbine to run and is discharged through the exhaust outlet of the turbine, and because the rotating speed of the engine is low at this moment, the exhaust gas discharged by the first turbocharger 4 cannot push the turbine of the second turbocharger 6 to run, and the second turbocharger 6 does not participate in the work at this moment;
when the engine is running at a speed higher than a preset threshold (medium-high speed), exhaust gas enters the air inlet of the turbine of the first turbocharger 4 through the exhaust manifold 3, pushes the turbine to run, and is discharged through the exhaust outlet of the turbine, and because the engine speed is higher at this time, the exhaust gas discharged through the first turbocharger 4 pushes the turbine of the second turbocharger 6 to run, and at this time, the second turbocharger 6 discharges the exhaust gas to the tail pipe 7 through the exhaust outlet of the turbine.
Since the first turbocharger 4 and the second turbocharger 6 cannot be immediately operated immediately when the engine is just started due to the turbo lag effect of the turbochargers, neither the first turbocharger 4 nor the second turbocharger 6 is operated immediately when the engine is just started.
An air inlet of the compressor of the first turbocharger 4 (through a filter rear intake adapter 9) is connected to the air filter 10, an air inlet of the compressor of the second turbocharger 6 (through the filter rear intake adapter 9) is connected to the air filter 10, and an air outlet of the compressor of the second turbocharger 6 is connected to an air inlet of the compressor of the first turbocharger 4.
When the turbine of the first turbocharger 4 is operated, the compressor connected thereto is driven to operate, and filtered air is taken out from the air cleaner 10 through the air inlet connected to the air cleaner 10 and discharged from the air outlet of the compressor.
When the turbine of the second turbocharger 6 operates, the compressor connected with the turbine is driven to operate, filtered air is obtained from the air filter 10 through the air inlet connected with the air filter 10, and the obtained filtered air enters the air inlet of the compressor of the first turbocharger 4 through the air outlet of the compressor because the air outlet of the compressor is connected with the air inlet of the compressor of the first turbocharger 4.
In an alternative embodiment, the engine supercharging system provided in the embodiment of the present application further includes an inter-stage intercooler 8;
the inter-stage intercooler 8 is connected between the air inlet of the compressor of the first turbocharger 4 and the air outlet of the compressor of the second turbocharger 6, and is configured to cool the temperature of the air discharged from the compressor of the second turbocharger 6.
An exhaust port of the compressor of the first turbocharger 4 is connected to an intake port of the supercharger 14; when the first turbocharger 4 and the supercharger 14 are simultaneously turned on, the first turbocharger 4 transmits the obtained filtered air to the supercharger 14 through the exhaust port of the compressor so that the supercharger 14 supercharges the supercharger.
The air intake of the supercharger 14 is connected to the air cleaner 10, and the exhaust of the supercharger 14 is connected to the intake manifold 2 of the engine; when the first turbocharger 4 is not activated, the supercharger 14 takes filtered air directly from the air cleaner 10, pressurizes it and delivers it to the intake manifold 2 of the engine via the exhaust port.
The exhaust port of the compressor of the first turbocharger 4 is also connected to the exhaust port of the supercharger 14 through the first valve 13, and the first valve 13 is opened when the air pressure P2 of the exhaust port of the compressor of the first turbocharger 4 is greater than the air pressure P3 of the exhaust port of the supercharger 14;
in order to prevent filtered air from directly entering the intake manifold 2 of the engine from the exhaust port of the compressor of the first supercharger 4 when the first supercharger 4 and the supercharger 14 are simultaneously turned on, the embodiment of the present application has a first valve 13 connected between the exhaust port of the compressor of the first turbocharger 4 and the exhaust port of the supercharger 14.
The first valve 13 is controlled by the air pressure at two sides, and when the front side air pressure P2 is greater than the rear side air pressure P3, the first valve 13 is opened.
In an alternative embodiment, the engine supercharging system provided in the embodiment of the present application further includes a main intercooler 16; the main intercooler 16 is connected between the exhaust port of the supercharger 14 and the intake manifold 2 of the engine, and is connected to the intake manifold 2 of the engine through an intake adapter 17, and is configured to cool the gas discharged from the supercharger 14 and/or the gas discharged from the gas outlet of the compressor of the first turbocharger 4, that is, the gas transmitted to the intake manifold 2 of the engine.
The ECU is connected to the engine and the supercharger 14, and controls the operation of the supercharger 14 when the engine speed is lower than a set threshold value.
In an alternative embodiment, the engine boosting system provided in the embodiment of the present application further includes a second valve 11; an air inlet of the compressor of the first turbocharger 4 is connected to the air cleaner 10 through the second valve 11; the second valve 11 is opened when the air pressure P0 after the air cleaner 10 is higher than the air pressure P1 at the air inlet of the compressor of the first turbocharger 4.
In an alternative embodiment, the engine boosting system provided in the embodiment of the present application further includes a third valve 12; an intake port of the supercharger 14 is connected to the air cleaner 10 through the third valve 12; the third valve 12 is opened when the air pressure P0 after the air cleaner 10 is higher than the air pressure at the intake port of the supercharger 14 (i.e., the air pressure P2 at the exhaust port of the compressor of the first turbocharger 4).
It should be noted that, in the embodiment of the present application, there is no limitation on the types of the second valve 11 and the third valve 12, and they may be pressure valves or electrically controlled valves. In the embodiment of the present invention, the second valve 11 and the third valve 12 may be configured according to actual requirements, the first valve 13 is indispensable in the engine supercharging system, and in order to ensure effective operation of the engine supercharging system, the sensitivity and the sealing performance of the valves need to be ensured, and the wear resistance is good.
In practice, the cooperation of opening and closing the first valve 13, the second valve 11, and the third valve 12 can effectively reduce the pressure loss in the intake pipes at various locations at medium and low rotation speeds.
In an alternative embodiment, the engine boosting system provided in the embodiment of the present application further includes a transmission mechanism 15; the supercharger 14 is connected to the engine body 1 through the transmission mechanism 15; and when the engine speed is lower than a set threshold value, the ECU controls the engine to drive the mechanical supercharger 14 to operate through the transmission mechanism 15.
In an alternative embodiment, the engine boosting system provided in the embodiments of the present application further comprises a clutch; the clutch is connected to the supercharger 14; the on/off of the supercharger 14 is controlled by controlling the clutch. Wherein the clutch is integrated with the supercharger 14 or is provided separately.
In an alternative embodiment, the supercharger 14 may be driven by a belt or other transmission.
In addition, the supercharger 14 may be configured as an electric supercharger that can be operated independently without being connected to the engine, in addition to being operated by the driving of the engine in the above-described manner, and is operated independently according to a control signal of the ECU.
An embodiment of the present application further provides a method for controlling a supercharging system of an engine, as shown in fig. 3, including:
step 301, monitoring the rotating speed of an engine in real time; in practice, the real-time speed of the engine can be detected by a speed sensor arranged in the engine.
Step 302, determining whether the rotating speed of the engine is lower than a set threshold value; if yes, go to step 203, if no, go to step 304;
step 303, controlling the operation of the mechanical supercharger 14;
and step 304, controlling the mechanical supercharger 14 to stop running.
The set threshold may be determined according to actual requirements, and in practice, fluctuations in the operation of the engine may be further reduced according to debugging of the set threshold, that is, nodes where the supercharger 14 is connected and disconnected.
The pressure levels and the valve opening/closing states of the engine supercharging system at the middle and low rotation speeds (the rotation speed is lower than the set threshold after the engine is started for a period of time) and the middle and high rotation speeds (the rotation speed is not lower than the set threshold after the engine is started for a period of time) of the engine just after the engine is started are described as follows according to fig. 4 to 6:
when P0 is more than P1, the second valve 11 is opened, otherwise, the second valve is closed;
when P0 is more than P2, the third valve 12 is opened, otherwise, the third valve is closed;
when P2 is more than P3, the first valve 13 is opened, otherwise, the first valve is closed;
where P0 is the air pressure after the air cleaner 10, P1 is the air pressure at the air inlet of the compressor of the first turbocharger 4, P2 is the air pressure at the air outlet of the compressor of the first turbocharger 4 (i.e., the air pressure at the air inlet of the supercharger 14), and P3 is the air pressure at the air outlet of the supercharger 14.
1. Immediately after the engine is started at a low speed, the mechanical supercharger 14 is opened, the turbocharger has slow response in a short time, so that the first turbocharger 4 and the second turbocharger 6 are not started, and in addition, pressure resistance exists in each pipeline and the interstage intercooler 8, and the pressure and the valve are opened and closed at the moment, as shown in fig. 4:
p0 < P1 the second valve 11 is closed;
p0 is more than P2, and the third valve 12 is opened;
p3 > P2, the first valve 13 is closed.
At this time, the air filtered by the air filter 10 enters the air inlet of the supercharger 14 through the opened third valve 12, is discharged from the supercharged air outlet, and enters the engine intake manifold 2 through the intercooler 16.
2. When the engine speed is at the middle and low speed, the high-pressure stage turbocharger (the first turbocharger 4) is in effect, the mechanical supercharger 14 still operates at the moment, and the pressure and the valve are opened and closed, as shown in fig. 5:
p0 is more than P1, the second valve 11 is opened;
p0 is less than P2, and the third valve 12 is closed;
p2 < P3, the first valve 13 is closed.
At this time, the air filtered by the air filter 10 enters the air inlet of the compressor of the first turbocharger 4 through the opened second valve 11, enters the air inlet of the supercharger 14 through the air outlet of the compressor, is discharged from the air outlet after being supercharged, and then enters the engine air inlet manifold 2 through the intercooler 16.
3. When the engine enters a medium-high rotating speed, the two-stage turbocharger is an effective turbocharger, namely the first turbocharger 4 and the second turbocharger 6 work normally, and the mechanical supercharger 14 stops working. The pressure level and valve opening and closing at this time are as shown in fig. 6:
p2 > P1 > P0, the second valve 11 is closed, and the third valve 12 is closed;
p2 > P3, the first valve 13 is opened.
At this time, the air filtered by the air filter 10 enters the compressor of the second turbocharger 6 through the air inlet, enters the air inlet of the compressor of the first turbocharger 4 through the air outlet of the compressor and the inter-stage intercooler 8, enters the main intercooler 17 through the air outlet of the compressor and the opened first valve 13, and enters the engine air inlet manifold 2 after being cooled.
At this time, since the model supercharger 14 stops rotating, there is a flow resistance itself, there is a pressure difference between both sides of the first valve 13, and the first valve 13 is opened.
The embodiment of the application also provides a vehicle, which comprises the engine supercharging system, and when the vehicle runs, the ECU in the engine supercharging system controls the engine supercharging system according to the engine supercharging system control method.
The ECU consists of a microcontroller, a memory, an input/output interface, an analog-to-digital converter, a shaping circuit, a driving circuit and other large-scale integrated circuits.
A memory for storing a computer program for execution by the microcontroller. The memory can mainly comprise a program storage area and a data storage area, wherein the program storage area can store an operating system, programs needed by running the instant messaging function and the like; the storage data area can store various instant messaging information, operation instruction sets and the like.
The memory may be a volatile memory (RAM), such as a random-access memory (RAM); the memory may also be a non-volatile memory (non-volatile memory), such as a read-only memory (rom), a flash memory (flash memory), a hard disk (HDD) or a solid-state drive (SSD); or the memory is any other medium that can be used to carry or store a desired computer program in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory may be a combination of the above.
A microcontroller, which may include one or more Central Processing Units (CPUs), or be a digital processing unit, etc. And the microcontroller is used for realizing the control of the engine supercharging system when calling the computer program stored in the memory.
In the embodiments of the present application, specific connection media among the above-mentioned devices such as the microcontroller, the memory, the input/output interface, the analog-to-digital converter, and the like are not limited. In the embodiment of the present application, the memory and the microcontroller are connected by a bus, and the connection manner between other components is only for illustrative purposes and is not limited thereto. The bus may be divided into an address bus, a data bus, a control bus, etc.
The memory stores computer storage media having computer-executable instructions stored therein for implementing control of the engine boosting system according to the engine boosting system control method of the embodiment of the present application. The microcontroller is used for executing the engine supercharging system control method to realize control of the engine supercharging system.
In some possible embodiments, various aspects of the engine supercharging system control method provided by the present application may also be implemented in the form of a program product including a computer program for causing an ECU to perform the steps of the engine supercharging system control method according to various exemplary embodiments of the present application described above in this specification when the program product is run on an electronic device.
The program product may employ any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
The program product of the embodiments of the present application may employ a portable compact disc read only memory (CD-ROM) and include a computer program, and may be run on an ECU. However, the program product of the present application is not limited thereto, and in this document, a readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with a command execution system, apparatus, or device.
A readable signal medium may include a propagated data signal with a readable computer program embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A readable signal medium may also be any readable medium that is not a readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with a command execution system, apparatus, or device.
The computer program embodied on the readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer programs for carrying out operations of the present application may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer program may be executed in whole, in part, or as a stand-alone software package.
It should be noted that although several units or sub-units of the apparatus are mentioned in the above detailed description, such division is merely exemplary and not mandatory. Indeed, the features and functions of two or more units described above may be embodied in one unit, according to embodiments of the application. Conversely, the features and functions of one unit described above may be further divided into embodiments by a plurality of units.
Further, while the operations of the methods of the present application are depicted in the drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having a computer-usable computer program embodied therein.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (10)

1. An engine supercharging system comprising an engine, a plurality of turbochargers, a supercharger, a first valve, an air cleaner and an Electronic Control Unit (ECU), wherein:
the engine comprises an intake manifold and an exhaust manifold;
the turbochargers are connected in series and/or in parallel, wherein the air inlet of the turbine of the first turbocharger is directly connected with the exhaust manifold of the engine, and the air outlet of the compressor of the first turbocharger is connected with the air inlet of the mechanical supercharger;
the air inlet of the mechanical supercharger is also connected with the air filter, and the air outlet of the mechanical supercharger is connected with the air inlet main pipe of the engine;
the exhaust port of the compressor of the first turbocharger is also connected with the exhaust port of the mechanical supercharger through the first valve, and the first valve is opened when the air pressure of the exhaust port of the compressor of the first turbocharger is greater than that of the exhaust port of the mechanical supercharger;
the ECU is connected with the engine and the mechanical supercharger and controls the mechanical supercharger to operate when the rotating speed of the engine is lower than a set threshold value.
2. The engine boosting system of claim 1, wherein the plurality of turbochargers includes the first and second turbochargers;
the first turbocharger and the second turbocharger are connected in series;
the air inlet of the compressor of the first turbocharger is connected with the air filter, and the air inlet of the compressor of the second turbocharger is connected with the air filter.
3. The engine boosting system of claim 2, further comprising a second valve;
the air inlet of the compressor of the first turbocharger is connected with the air filter through the second valve;
the second valve is opened when the air pressure after the air cleaner is greater than the air pressure at the air inlet of the compressor of the first turbocharger.
4. The engine boosting system of claim 2, further comprising a third valve;
the air inlet of the mechanical supercharger is connected with the air filter through the third valve;
and the third valve is opened when the air pressure behind the air filter is greater than the air pressure of the air inlet of the mechanical supercharger.
5. The engine boosting system according to claim 2, further comprising an inter-stage intercooler:
and the air inlet of the compressor of the first turbocharger is connected with the air outlet of the compressor of the second turbocharger through the inter-stage intercooler.
6. The engine boosting system of claim 1, further comprising a transmission;
the mechanical supercharger is connected with the engine body through the transmission mechanism;
and when the rotating speed of the engine is lower than a set threshold value, the ECU controls the engine to drive the mechanical supercharger to operate through the transmission mechanism.
7. The engine boosting system according to claim 1, further comprising a main intercooler;
the main intercooler is connected between an exhaust port of the supercharger and an intake manifold of the engine.
8. The engine boosting system of claim 1, further comprising a clutch;
the clutch is connected with the mechanical supercharger;
the clutch is integrated with the supercharger or is arranged independently.
9. An engine supercharging system control method applied to the ECU of the engine supercharging system according to any one of claims 1 to 8, characterized by comprising:
monitoring the rotating speed of an engine in real time, and determining whether the rotating speed of the engine is lower than a set threshold value;
when the rotation speed of the engine is determined to be lower than the set threshold value, controlling the mechanical supercharger to operate;
and when the rotation speed of the engine is determined not to be lower than the set threshold value, controlling the mechanical supercharger to stop running.
10. A vehicle characterized by comprising an engine supercharging system according to any one of claims 1 to 8.
CN202211189570.0A 2022-09-28 2022-09-28 Engine supercharging system, control method and vehicle Pending CN115506881A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211189570.0A CN115506881A (en) 2022-09-28 2022-09-28 Engine supercharging system, control method and vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211189570.0A CN115506881A (en) 2022-09-28 2022-09-28 Engine supercharging system, control method and vehicle

Publications (1)

Publication Number Publication Date
CN115506881A true CN115506881A (en) 2022-12-23

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Family Applications (1)

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Country Status (1)

Country Link
CN (1) CN115506881A (en)

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