CN114278430B - Control method of successive supercharging system and successive supercharging system - Google Patents
Control method of successive supercharging system and successive supercharging system Download PDFInfo
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- CN114278430B CN114278430B CN202111681774.1A CN202111681774A CN114278430B CN 114278430 B CN114278430 B CN 114278430B CN 202111681774 A CN202111681774 A CN 202111681774A CN 114278430 B CN114278430 B CN 114278430B
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention relates to the technical field of engines, in particular to a control method of a sequential supercharging system and the sequential supercharging system, wherein the control method of the sequential supercharging system comprises the steps that after a sequential supercharging switching request is generated in the working process of an engine and is converted into a sequential supercharging mode, an ECU reads the rotating speed of the engine, the fuel injection quantity of the engine, the temperature of supercharged air and the pressure of the supercharged air; starting a delay basic value MAP of an intake valve and an exhaust valve of a sequential supercharging system based on the rotating speed and the fuel injection quantity to obtain a delay time basic value T1; obtaining a delay time correction percentage P1 based on the correction percentage MAP of the temperature and the pressure of the charged air; obtaining the opening delay time T2= T1P 1 of the air inlet and outlet valve after the successive pressurization switching; the time delay of the opening of the air inlet and outlet valves is converted from T1 to T2. The control method of the sequential supercharging system provided by the invention can smoothly switch the time delay of the opening of the intake valve and the exhaust valve according to the operating condition of the engine.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a control method of a sequential supercharging system and the sequential supercharging system.
Background
The sequential supercharging system is a supercharging system formed by connecting two or more superchargers in parallel, the superchargers in the system can be divided into a basic supercharger and a controllable supercharger, the basic supercharger keeps running constantly in the working process of the engine, and the controllable supercharger can be switched in/out successively according to a preset working sequence along with the change of the rotating speed and the load of the engine so as to ensure the efficient working of the engine.
For an engine with a sequential supercharging system, the delay time of opening the inlet valve and the exhaust valve of the supercharger (the time interval of the inlet valve lags behind the opening of the exhaust valve) is the most important link for the success of switching the sequential supercharging, and the delay time is too long or too short, which causes the failure of switching the sequential supercharging.
Disclosure of Invention
The invention aims to provide a control method of a sequential supercharging system and the sequential supercharging system, which can solve the problem that the delay time of opening an air inlet and an air outlet valve of an engine with the sequential supercharging system in the prior art is fixed and cannot meet the complicated operating condition and environmental condition of the engine.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the present invention provides a method for controlling a sequential turbocharging system, including:
when a sequential supercharging switching request exists in the working process of the engine, switching to a sequential supercharging mode, and reading the rotating speed of the engine, the fuel injection quantity of the engine, the temperature of supercharged air and the pressure of supercharged air;
reading a starting delay basic value MAP of an air inlet valve and an air outlet valve of a sequential supercharging system based on the rotating speed and the oil injection quantity to obtain a delay time basic value T1;
obtaining a delay time correction percentage P1 based on the charge air temperature and the charge air pressure correction percentage MAP;
obtaining the opening delay time T2= T1P 1 of the air inlet and exhaust valve after the current successive pressurization switching;
and converting the opening delay time of the air inlet and outlet valve into T2.
Preferably, before the intake/exhaust valve opening delay time is converted into T2, a maximum intake/exhaust valve opening delay time value Tmax is obtained based on the rotation speed and the maximum intake/exhaust valve opening delay time value MAP of the injected fuel quantity, if T2 is smaller than Tmax, the intake/exhaust valve opening delay time is converted into T2, and if T2 is larger than Tmax, the intake/exhaust valve opening delay time is converted into Tmax.
Preferably, the operation state of the engine is detected after the intake/exhaust valve opening delay time is converted to T2, and if the engine can normally operate with the intake/exhaust valve opening delay time set to T2, the current intake/exhaust valve opening delay time T2 is maintained.
Preferably, if the intake/exhaust valve opening delay time is set to T2 and the engine operating state is abnormal after the switching, it is determined that the switching of the intake/exhaust valve opening delay time has failed this time.
Preferably, a correction factor P2 is obtained based on the rotation speed of the engine and a correction factor MAP of the fuel injection amount of the engine in the current switching failure state, a new correction percentage P3= P1 × P2 is obtained based on the correction percentage P1, and the intake/exhaust valve opening delay time T2 is corrected to be T3= T2 × P3.
Preferably, if the original opening delay time of the intake valve and the exhaust valve is corrected to be T3 which is still failed to open, P3 is continuously corrected by the correction factor P2.
Preferably, if the number of times of the failure in opening the intake/exhaust valve is greater than a set number of times, an alarm is given.
Preferably, the correction factor P2 is greater than 1.
The invention also provides a sequential supercharging system and a control method using the sequential supercharging system.
Preferably, the sequential supercharging system comprises an inlet valve and an exhaust valve, both of which are communicatively connected to an ECU (Electronic Control Unit).
The invention has the beneficial effects that: the control method of the sequential supercharging system provided by the invention can be realized only through an ECU control program without adding other auxiliary devices in terms of the realization method, and has the advantages of simple realization method and strong reliability; compared with the fixed delay time, the delay time is stronger in adaptability to the operating condition and the environmental condition of the engine, the successive pressure increase is guaranteed to be successfully switched under various conditions, particularly, the performance of the whole engine and parts is gradually deteriorated along with the increase of the operating time of the engine, and the correction of the delay time is more necessary.
In another aspect, the present invention also provides a sequential supercharging system, and a control method using the sequential supercharging system.
Drawings
Fig. 1 is a first control flowchart of a control method of a sequential turbocharging system according to the present invention;
fig. 2 is a control flowchart of a control method of the sequential turbocharging system of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings and the embodiment. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and encompass, for example, both fixed and removable connections unless otherwise explicitly stated or limited; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1-2, the present invention provides a control method of a sequential supercharging system, including that during the working process of an engine, after a sequential supercharging switching request is made during the working process of the engine, the engine is switched to a sequential supercharging mode, and an ECU reads the rotation speed of the engine, the fuel injection quantity of the engine, the temperature of the supercharged air and the pressure of the supercharged air; the ECU opens the delay basic value MAP of the intake and exhaust valve of the sequential supercharging system based on the rotating speed and the fuel injection quantity to obtain a delay time basic value T1; the ECU obtains a delay time correction percentage P1 based on the correction percentage MAP of the temperature and the pressure of the pressurized air; obtaining the opening delay time T2= T1P 1 of the air inlet and exhaust valve after the current successive pressurization switching; the intake/exhaust valve opening delay time is converted to T2.
The control method of the sequential supercharging system provided by the embodiment is characterized in that when the sequential supercharging switching requirement exists, the sequential supercharging is switched to sequential supercharging, at the moment, two or more superchargers are put into use, the rotating speed, the fuel injection quantity, the supercharged air temperature and the supercharged air pressure of an engine all change, at the moment, a delay time basic value T1 is obtained according to a basic value MAP of the opening delay of an air inlet and exhaust valve of the sequential supercharging system based on the rotating speed and the fuel injection quantity, a delay time correction percentage P1 is obtained based on a correction percentage MAP of the temperature and the pressure of the supercharged air, the opening delay time T2= T1P 1 of the air inlet and exhaust valve after the sequential supercharging switching is obtained through calculation of an ECU, the working condition after the sequential supercharging is met, and compared with the sequential supercharging system in the prior art that the delay time of the opening of the air inlet and exhaust valve is fixed, the control method of the sequential supercharging system provided by the embodiment guarantees that the sequential supercharging can be smoothly switched under various conditions.
In the implementation method, the control method of the sequential supercharging system provided by the embodiment can be implemented only through an ECU (electronic control unit) control program without adding other auxiliary devices, and is simple in implementation method and strong in reliability; compared with the fixed delay time, the delay time is stronger in adaptability to the operating condition and the environmental condition of the engine, the successive pressure increase is guaranteed to be successfully switched under various conditions, particularly, the performance of the whole engine and parts is gradually deteriorated along with the increase of the operating time of the engine, and the correction of the delay time is more necessary.
Specifically, before the opening delay time of the air inlet and outlet valve is converted into T2, the ECU checks the maximum value MAP of the opening delay time of the air inlet and outlet valve based on the rotating speed and the fuel injection quantity to obtain the maximum value Tmax of the opening delay time of the air inlet and outlet valve, if T2 is smaller than Tmax, the opening delay time of the air inlet and outlet valve is converted into T2, if T2 is larger than Tmax, the opening delay time of the air inlet and outlet valve is converted into Tmax, the phenomenon that the opening delay time of the air inlet and outlet valve is excessively corrected to cause the delay time to exceed a reasonable range, so that the air exhaust duration drives a supercharger to idle, energy loss and insufficient air supply of an air cylinder are caused to influence the normal operation of an engine.
Specifically, after the opening delay time of the air inlet and exhaust valve is converted into T2, the ECU detects the running state of the engine, if the engine can run normally without abnormal state due to the opening delay time T2 of the air inlet and exhaust valve, the corrected opening delay time T2 of the air inlet and exhaust valve is shown to be in accordance with the running working condition of the engine, and the opening delay time T2 of the air inlet and exhaust valve is kept without continuous correction.
Further, if the opening delay time of the intake and exhaust valve is switched to T2, the engine cannot operate normally (if the delay time of the exhaust valve is too long or too short, the intake air amount in the cylinder is insufficient or the intake pressure is insufficient, and the ECU can directly detect the intake pressure), the switching failure of the opening delay time of the intake and exhaust valve is determined, the ECU obtains a correction factor P2 based on the correction factor MAP of the rotating speed and the fuel injection amount in the current switching failure state, obtains a new correction percentage P3= P1P 2 based on the correction percentage P1, and corrects the original opening delay time T2 of the intake and exhaust valve to be T3= T2P 3 at the next time, and experiments show that the switching failure is often caused by the delay time being too short, the intake valve is opened when the rotating speed of the supercharger is too low, and the intake pressure is insufficient, so in this embodiment, the correction factor P2 is greater than 1.
Specifically, if the original opening delay time of the air inlet and outlet valve is corrected to be T3 and the valve is still opened, P3 is continuously corrected through a correction factor P2, and according to the analogy of the method, P4= P3P 2, T4= T3P 4 \8230, 8230and the like.
Specifically, if the switching failure times are larger than the set times, the supercharging system is judged to be in fault, then the alarm is given, and the ECU can control an alarm lamp or give a voice prompt to an operator to maintain in time.
The sequential supercharging system comprises an air inlet valve and an exhaust valve which are both in communication connection with an ECU (electronic control unit), and the ECU can control the opening delay time of the air inlet valve and the exhaust valve according to the stored correction percentage MAP of the temperature and the pressure of the supercharged air, the maximum MAP of the opening delay time of the air inlet valve and the exhaust valve of the rotating speed and the fuel injection quantity and the correction factor MAP of the rotating speed and the fuel injection quantity.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. A control method of a sequential turbocharging system, characterized by comprising:
when a sequential supercharging switching request exists in the working process of the engine, switching to a sequential supercharging mode, and reading the rotating speed of the engine, the fuel injection quantity of the engine, the temperature of supercharged air and the pressure of supercharged air;
reading a starting delay basic value MAP of an inlet valve and an exhaust valve of a sequential supercharging system based on the rotating speed and the fuel injection quantity to obtain a delay time basic value T1;
obtaining a delay time correction percentage P1 based on the charge air temperature and the charge air pressure correction percentage MAP;
obtaining the opening delay time T2= T1P 1 of the air inlet and outlet valve of the successive pressurization switching;
converting the opening delay time of the air inlet and outlet valve into T2, detecting the running state of the engine after converting the opening delay time of the air inlet and outlet valve into T2, if the opening delay time of the air inlet and outlet valve is set to be T2, the engine can run normally, keeping the current opening delay time of the air inlet and outlet valve to be T2, if the opening delay time of the air inlet and outlet valve is set to be T2, and after switching, if the running state of the engine is abnormal, determining that the switching of the opening delay time of the air inlet and outlet valve fails;
and obtaining a correction factor P2 based on the rotating speed of the engine in the current switching failure state and a correction factor MAP of the fuel injection quantity of the engine, obtaining a new correction percentage P3= P1P 2 on the basis of the correction percentage P1, and correcting the opening delay time of the intake and exhaust valve from T2 to T3= T2P 3 next time.
2. The control method of a sequential supercharging system according to claim 1, wherein a maximum intake/exhaust valve opening delay time Tmax is obtained based on the maximum intake/exhaust valve opening delay time MAP of the rotation speed and the injected fuel quantity before the intake/exhaust valve opening delay time is converted to T2, and the intake/exhaust valve opening delay time is converted to T2 if T2 is smaller than Tmax and the intake/exhaust valve opening delay time is converted to Tmax if T2 is larger than Tmax.
3. The method for controlling a sequential turbocharging system according to claim 1, wherein if the original time delay for opening the intake and exhaust valves is corrected to be T3 which still fails to open, P3 is continuously corrected by the correction factor P2.
4. A control method of a sequential supercharging system according to claim 3, characterized in that an alarm is given if the number of opening failure times of the intake and exhaust valves is greater than a set number.
5. A control method of a sequential turbocharging system according to claim 1, characterized in that said correction factor P2 is larger than 1.
6. A sequential supercharging system using the method of controlling a sequential supercharging system according to any one of claims 1 to 5.
7. The sequential supercharging system of claim 6, wherein the sequential supercharging system comprises an intake valve and an exhaust valve, both of which are communicatively connected to an ECU.
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| CN202111681774.1A CN114278430B (en) | 2021-12-30 | 2021-12-30 | Control method of successive supercharging system and successive supercharging system |
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| CN202111681774.1A CN114278430B (en) | 2021-12-30 | 2021-12-30 | Control method of successive supercharging system and successive supercharging system |
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| CN114278430B true CN114278430B (en) | 2023-01-06 |
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| CN117307313B (en) * | 2023-11-27 | 2024-01-30 | 中国船舶集团有限公司第七一一研究所 | Sequential supercharging system, control method, computer-readable medium, internal combustion engine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0539726A (en) * | 1991-08-02 | 1993-02-19 | Toyota Motor Corp | Supercharging pressure controller for engine with supercharger |
| JPH0734887A (en) * | 1993-07-26 | 1995-02-03 | Fuji Heavy Ind Ltd | Control method of engine with supercharger |
| CN102177321A (en) * | 2008-12-11 | 2011-09-07 | 丰田自动车株式会社 | Supercharger control device for internal combustion engine |
| CN105317532A (en) * | 2015-11-12 | 2016-02-10 | 哈尔滨工程大学 | Opening control method for air valve of sequential supercharging system |
| CN112539112A (en) * | 2020-11-27 | 2021-03-23 | 潍柴动力股份有限公司 | Adaptive control method and system for sequential supercharger control valve and vehicle |
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2021
- 2021-12-30 CN CN202111681774.1A patent/CN114278430B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0539726A (en) * | 1991-08-02 | 1993-02-19 | Toyota Motor Corp | Supercharging pressure controller for engine with supercharger |
| JPH0734887A (en) * | 1993-07-26 | 1995-02-03 | Fuji Heavy Ind Ltd | Control method of engine with supercharger |
| CN102177321A (en) * | 2008-12-11 | 2011-09-07 | 丰田自动车株式会社 | Supercharger control device for internal combustion engine |
| CN105317532A (en) * | 2015-11-12 | 2016-02-10 | 哈尔滨工程大学 | Opening control method for air valve of sequential supercharging system |
| CN112539112A (en) * | 2020-11-27 | 2021-03-23 | 潍柴动力股份有限公司 | Adaptive control method and system for sequential supercharger control valve and vehicle |
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