CN111946443A - Variable-section turbine two-stage sequential supercharging system structure and control method - Google Patents
Variable-section turbine two-stage sequential supercharging system structure and control method Download PDFInfo
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- CN111946443A CN111946443A CN202010735716.1A CN202010735716A CN111946443A CN 111946443 A CN111946443 A CN 111946443A CN 202010735716 A CN202010735716 A CN 202010735716A CN 111946443 A CN111946443 A CN 111946443A
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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
- F02B37/001—Engines characterised by provision of pumps driven at least for part of the time by exhaust using exhaust drives arranged in parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
- F01D17/14—Final actuators arranged in stator parts varying effective cross-sectional area of nozzles or guide conduits
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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
- F02B37/004—Engines characterised by provision of pumps driven at least for part of the time by exhaust with exhaust drives arranged in series
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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
- F02B37/007—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
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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
- F02B37/013—Engines characterised by provision of pumps driven at least for part of the time by exhaust with exhaust-driven pumps arranged in series
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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
- F02B37/12—Control of the pumps
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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
- F02B37/12—Control of the pumps
- F02B37/16—Control of the pumps by bypassing charging air
- F02B37/162—Control of the pumps by bypassing charging air by bypassing, e.g. partially, intake air from pump inlet to pump outlet
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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
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
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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
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
- F02B37/183—Arrangements of bypass valves or actuators therefor
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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
- F02B37/12—Control of the pumps
- F02B37/24—Control of the pumps by using pumps or turbines with adjustable guide vanes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10006—Air intakes; Induction systems characterised by the position of elements of the air intake system in direction of the air intake flow, i.e. between ambient air inlet and supply to the combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/1015—Air intakes; Induction systems characterised by the engine type
- F02M35/10157—Supercharged engines
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Supercharger (AREA)
Abstract
The invention aims to provide a two-stage sequential supercharging system structure of a variable-section turbine and a control method, wherein the two-stage sequential supercharging system structure comprises a diesel engine, an A-line low-pressure-stage variable-section turbocharger, an A-line high-pressure-stage variable-section turbocharger, a B-line low-pressure-stage variable-section turbocharger and a B-line high-pressure-stage variable-section turbocharger, the A-line low-pressure-stage variable-section turbocharger is connected with the A-line high-pressure-stage variable-section turbocharger and matched with an A-line air inlet pipe and an air outlet pipe, the B-line low-pressure-stage variable-section turbocharger is connected with the B-line high-pressure-stage variable-section turbocharger and matched with the B-line air inlet pipe and the air outlet pipe, a high-pressure gas valve is installed at the inlet of the B. The invention improves the low working condition performance of the diesel engine, can provide higher supercharging pressure, improves the transient response characteristic by changing the opening of the nozzle ring, and realizes good matching with the diesel engine in the full working condition range.
Description
Technical Field
The invention relates to a diesel engine, in particular to a large diesel engine with sequential supercharging.
Background
High speed diesel engines are developing towards high pressure ratio, high power, low emissions. The traditional sequential supercharging means that two turbochargers with fixed cross sections are connected in parallel on the diesel engine, one supercharger works under a low working condition, and the two superchargers work together under a high working condition. The two-stage sequential supercharging technology means that a large turbine two-stage supercharging system and a small turbine two-stage supercharging system are connected in parallel on a diesel engine, one row of two-stage supercharging systems works under a low working condition, and two rows of two-stage supercharging systems work together under a high working condition, so that the supercharging pressure and the performance of the whole engine are improved.
Disclosure of Invention
The invention aims to provide a two-stage sequential supercharging system structure of a variable cross-section turbine and a control method thereof, which can realize the optimal matching of a turbocharger and a diesel engine in a larger range and obviously improve the overall performance, the transient performance and the turbine hysteresis phenomenon of the diesel engine.
The purpose of the invention is realized as follows:
the invention relates to a two-stage sequential supercharging system structure of a variable cross-section turbine, which is characterized in that: the system comprises a diesel engine, an A-row low-pressure stage variable-section turbocharger, an A-row high-pressure stage variable-section turbocharger, a B-row low-pressure stage variable-section turbocharger and a B-row high-pressure stage variable-section turbocharger, wherein the A-row low-pressure stage variable-section turbocharger comprises an A-row low-pressure stage gas compressor and an A-row low-pressure stage variable-section turbine, the A-row high-pressure stage variable-section turbocharger comprises an A-row high-pressure stage gas compressor and an A-row high-pressure stage variable-section turbine, the B-row low-pressure stage variable-section turbocharger comprises a-row low-pressure stage gas compressor and a-row low-pressure stage variable-section turbine, the B-row high-pressure stage variable-section turbocharger comprises a-row high-pressure stage gas compressor and a-row high-pressure stage variable-section turbine, the inlet of the A-row low-pressure stage gas compressor is communicated with the atmosphere, the outlet end, the inlet of the B-row low-pressure stage compressor is communicated with the atmosphere, the outlet end of the B-row low-pressure stage compressor is connected with the B-row high-pressure stage compressor, the outlet end of the B-row high-pressure stage compressor is connected with a second intercooler, the outlet of the second intercooler is respectively connected with an A-row air inlet header pipe and a B-row air inlet header pipe of the diesel engine, an A-row exhaust header pipe and a B-row exhaust header pipe of the diesel engine are both connected with a communicating pipe, the first outlet of the communicating pipe is connected with an A-row high-pressure stage variable cross-section turbine, the outlet end of the A-row high-pressure stage variable cross-section turbine is connected with an A-row low-pressure stage variable cross-section turbine, the second outlet of the communicating pipe is connected with a B-row high-pressure stage variable cross-section turbine, the outlet end of the B-row high-pressure stage variable cross-section turbine.
The two-stage sequential supercharging system structure of the variable-section turbine can further comprise:
1. the A-row high-pressure stage variable-section turbine is provided with an A-row high-pressure stage nozzle ring opening sensor, the A-row low-pressure stage variable-section turbine is provided with an A-row low-pressure stage nozzle ring opening sensor, the B-row high-pressure stage variable-section turbine is provided with a B-row high-pressure stage nozzle ring opening sensor, the B-row low-pressure stage variable-section turbine is provided with a B-row low-pressure stage nozzle ring opening sensor, the diesel engine is respectively provided with a diesel engine rotating speed sensor and an accelerator position sensor, a high-pressure gas valve is arranged between a communicating pipe and the B-row high-pressure stage variable-section turbine, and a high-pressure air valve.
The invention discloses a control method of a two-stage sequential supercharging system of a variable cross-section turbine, which is characterized by comprising the following steps: the two-stage sequential supercharging system structure of the variable cross-section turbine as claimed in claim 1 is adopted;
through performance tests, an optimal nozzle ring opening MAP and an optimal supercharging pressure MAP of the A-row low-pressure-stage variable-section turbocharger and the A-row high-pressure-stage variable-section turbocharger working independently are obtained, and the optimal nozzle ring opening MAP and the optimal supercharging pressure MAP of the A-row low-pressure-stage variable-section turbocharger, the A-row high-pressure-stage variable-section turbocharger, the B-row low-pressure-stage variable-section turbocharger and the B-row high-pressure-stage variable-section turbocharger working simultaneously are stored in a main controller ECU;
when the working condition of the diesel engine is higher than 50%, firstly opening a high-pressure gas valve, and then opening a high-pressure air valve in a delayed manner, so that the A-row low-pressure-stage variable-section turbocharger, the A-row high-pressure-stage variable-section turbocharger, the B-row low-pressure-stage variable-section turbocharger and the B-row high-pressure-stage variable-section turbocharger work simultaneously, inquiring an optimal nozzle ring opening MAP (MAP) and an optimal supercharging pressure MAP (MAP) stored in an ECU (electronic control unit) for the A-row low-pressure-stage variable-section turbocharger, the A-row high-pressure-stage variable-section turbocharger, the B-row low-pressure-stage variable-section turbocharger and the B-row high-pressure-stage variable-section turbocharger working simultaneously, and adjusting the A-row low-pressure-stage nozzle ring, the B-row low-pressure;
when the working condition of the diesel engine is lower than 45 percent, the ECU judges the switching working condition of the diesel engine through a diesel engine rotating speed sensor, an accelerator position sensor, an A-row low-pressure stage nozzle ring opening degree sensor and an A-row high-pressure stage nozzle ring opening degree sensor, closes a high-pressure gas valve firstly, then closes a high-pressure air valve in a delayed mode, and cuts out a B-row low-pressure stage variable-section turbocharger and a B-row high-pressure stage variable-section turbocharger to enable the A-row low-pressure stage variable-section turbocharger, the A-row high-pressure-stage variable-section turbocharger works independently, an optimal nozzle ring opening MAP and an optimal supercharging pressure MAP which are stored in an ECU and used for the A-row low-pressure-stage variable-section turbocharger and the A-row high-pressure-stage variable-section turbocharger working independently are inquired to obtain a change signal of the nozzle ring opening, and the A-row low-pressure-stage nozzle ring opening and the A-row high-pressure-stage nozzle ring opening are adjusted to reach the optimal nozzle ring opening position.
The invention has the advantages that: the invention adopts a mode of combining a two-stage supercharging technology, a sequential supercharging technology and a variable cross-section turbocharging technology, obviously improves the low working condition performance of the diesel engine, can provide higher supercharging pressure, improves the transient response characteristic by changing the opening of the nozzle ring, and realizes good matching with the diesel engine in the full working condition range.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
referring to fig. 1, the device of the present invention includes a diesel engine whole 14, an a row intake manifold 13, an a row exhaust manifold 12, a B row intake manifold 16, a B row exhaust manifold 17, an a row one-stage intercooler 4, a B row one-stage intercooler 26, a two-stage intercooler 15, an a row low-pressure stage variable-section turbocharger 1, an a row high-pressure stage variable-section turbocharger 7, a B row low-pressure stage variable-section turbocharger 28, a B row high-pressure stage variable-section turbocharger 23, and the like. A. The compressor ends 2 and 29 of the B-column low-pressure-stage variable-section turbochargers 1 and 28 are communicated with the atmosphere, the outlets of the compressors 2 and 29 of the A, B-column low-pressure-stage variable-section turbochargers 1 and 28 are connected with A, B-column one- stage charge coolers 4 and 26, the A, B-column one- stage charge coolers 4 and 26 are connected with the compressors 6 and 24 of the A, B-column high-pressure-stage variable-section turbochargers 7 and 23 and are connected with a diesel engine 14 through a two-stage charge cooler 15, the A, B-column low-pressure-stage variable- section turbines 3 and 27 are connected with A, B-column high-pressure-stage variable-section turbines 8, 21, A, B-column high-pressure-stage variable-section turbines 8 and 21 are connected with the diesel engine 14 through A, B-column exhaust manifolds 12 and 17, the A, B-column low-pressure-stage variable-section turbochargers 1 and 28 and the A, B-column high-pressure-stage variable-, the row a exhaust manifold 12 and the row B exhaust manifold 17 are connected by a communicating pipe 10. A high-pressure air valve 22 is arranged at the outlet of a compressor 24 of the B-row high-pressure-stage variable-section turbocharger, a high-pressure gas valve 19 is arranged between the exhaust gas inlet of a variable-section turbine 21 of the B-row high-pressure-stage variable-section turbocharger and a communicating pipe 10, a diesel engine 14 is provided with a diesel engine rotating speed sensor 11 and an accelerator position sensor 18, A, B-row high-pressure-stage variable-section turbine 8 and 21 of the variable-section turbocharger is provided with A, B-row high-pressure-stage nozzle ring opening sensors 9 and 20, and A, B-row low-pressure-stage variable- section turbine 3 and 27 of the variable-section turbocharger is provided with A, B-row low-pressure-stage nozzle ring opening. A high-pressure air valve position sensor, a high-pressure gas valve position sensor, A, B column low-pressure stage nozzle ring opening sensor 5, 25, A, B column high-pressure stage nozzle ring opening sensor 9, 20, a diesel engine rotating speed sensor 11 and an accelerator position sensor 18 are connected to a master controller ECU.
The invention discloses a control method of a two-stage sequential supercharging system of a variable cross-section turbine, which comprises the following steps:
through performance tests of a variable-section turbine two-stage sequential supercharged diesel engine, an optimal nozzle ring opening MAP and an optimal supercharging pressure MAP for the A-row two-stage supercharging system to work independently, an optimal nozzle ring opening MAP and an optimal supercharging pressure MAP for the A, B-row two-stage supercharging system to work simultaneously are obtained and stored in a master controller ECU, when the working condition of the diesel engine is higher than 50%, an execution mechanism is controlled through a high-pressure gas valve position sensor and a high-pressure air valve position sensor through a program stored in the master controller ECU, a high-pressure gas valve 19 is opened firstly, a high-pressure air valve 22 is opened after a certain time delay, the A-row variable-section two-stage supercharging system and the B-row variable-section two-stage supercharging system work simultaneously, the optimal nozzle ring opening MAP and the optimal supercharging pressure MAP for the A, B-row two-stage supercharging system to work simultaneously, and the execution mechanism is controlled to adjust the A-, The opening of the nozzle ring of the low-pressure stage in the row B and the opening of the nozzle ring of the high-pressure stage in the row A, B reach the optimal opening position of the nozzle ring. When the working condition of the diesel engine is lower than 45%, the main controller ECU judges the switching working condition of the diesel engine through a diesel engine rotating speed sensor, an accelerator position sensor, an A-row low-pressure stage nozzle ring opening sensor and an A-row high-pressure stage nozzle ring opening sensor, closes the high-pressure gas valve 19 firstly, closes the high-pressure air valve 22 after delaying for a certain time, and cuts off the B-row variable-section two-stage supercharging system, so that the A-row variable-section two-stage supercharging system works independently. An optimal nozzle ring opening MAP and an optimal supercharging pressure MAP, which are stored in an ECU and used for the A-row two-stage supercharging system to work independently, are inquired to obtain a change signal of the nozzle ring opening, and an execution mechanism is controlled to adjust the opening of the A-row low-pressure-level nozzle ring and the opening of the A-row high-pressure-level nozzle ring to reach the optimal nozzle ring opening position.
Claims (3)
1. Variable cross section turbine two-stage is pressure boost system structure in succession, characterized by: the system comprises a diesel engine, an A-row low-pressure stage variable-section turbocharger, an A-row high-pressure stage variable-section turbocharger, a B-row low-pressure stage variable-section turbocharger and a B-row high-pressure stage variable-section turbocharger, wherein the A-row low-pressure stage variable-section turbocharger comprises an A-row low-pressure stage gas compressor and an A-row low-pressure stage variable-section turbine, the A-row high-pressure stage variable-section turbocharger comprises an A-row high-pressure stage gas compressor and an A-row high-pressure stage variable-section turbine, the B-row low-pressure stage variable-section turbocharger comprises a-row low-pressure stage gas compressor and a-row low-pressure stage variable-section turbine, the B-row high-pressure stage variable-section turbocharger comprises a-row high-pressure stage gas compressor and a-row high-pressure stage variable-section turbine, the inlet of the A-row low-pressure stage gas compressor is communicated with the atmosphere, the outlet end, the inlet of the B-row low-pressure stage compressor is communicated with the atmosphere, the outlet end of the B-row low-pressure stage compressor is connected with the B-row high-pressure stage compressor, the outlet end of the B-row high-pressure stage compressor is connected with a second intercooler, the outlet of the second intercooler is respectively connected with an A-row air inlet header pipe and a B-row air inlet header pipe of the diesel engine, an A-row exhaust header pipe and a B-row exhaust header pipe of the diesel engine are both connected with a communicating pipe, the first outlet of the communicating pipe is connected with an A-row high-pressure stage variable cross-section turbine, the outlet end of the A-row high-pressure stage variable cross-section turbine is connected with an A-row low-pressure stage variable cross-section turbine, the second outlet of the communicating pipe is connected with a B-row high-pressure stage variable cross-section turbine, the outlet end of the B-row high-pressure stage variable cross-section turbine.
2. The two-stage sequential turbocharging system structure of a variable cross-section turbine according to claim 1, wherein: the A-row high-pressure stage variable-section turbine is provided with an A-row high-pressure stage nozzle ring opening sensor, the A-row low-pressure stage variable-section turbine is provided with an A-row low-pressure stage nozzle ring opening sensor, the B-row high-pressure stage variable-section turbine is provided with a B-row high-pressure stage nozzle ring opening sensor, the B-row low-pressure stage variable-section turbine is provided with a B-row low-pressure stage nozzle ring opening sensor, the diesel engine is respectively provided with a diesel engine rotating speed sensor and an accelerator position sensor, a high-pressure gas valve is arranged between a communicating pipe and the B-row high-pressure stage variable-section turbine, and a high-pressure air valve.
3. The control method of the two-stage sequential supercharging system of the variable cross-section turbine is characterized in that: the two-stage sequential supercharging system structure of the variable cross-section turbine as claimed in claim 1 is adopted;
through performance tests, an optimal nozzle ring opening MAP and an optimal supercharging pressure MAP of the A-row low-pressure-stage variable-section turbocharger and the A-row high-pressure-stage variable-section turbocharger working independently are obtained, and the optimal nozzle ring opening MAP and the optimal supercharging pressure MAP of the A-row low-pressure-stage variable-section turbocharger, the A-row high-pressure-stage variable-section turbocharger, the B-row low-pressure-stage variable-section turbocharger and the B-row high-pressure-stage variable-section turbocharger working simultaneously are stored in a main controller ECU;
when the working condition of the diesel engine is higher than 50%, firstly opening a high-pressure gas valve, and then opening a high-pressure air valve in a delayed manner, so that the A-row low-pressure-stage variable-section turbocharger, the A-row high-pressure-stage variable-section turbocharger, the B-row low-pressure-stage variable-section turbocharger and the B-row high-pressure-stage variable-section turbocharger work simultaneously, inquiring an optimal nozzle ring opening MAP (MAP) and an optimal supercharging pressure MAP (MAP) stored in an ECU (electronic control unit) for the A-row low-pressure-stage variable-section turbocharger, the A-row high-pressure-stage variable-section turbocharger, the B-row low-pressure-stage variable-section turbocharger and the B-row high-pressure-stage variable-section turbocharger working simultaneously, and adjusting the A-row low-pressure-stage nozzle ring, the B-row low-pressure;
when the working condition of the diesel engine is lower than 45 percent, the ECU judges the switching working condition of the diesel engine through a diesel engine rotating speed sensor, an accelerator position sensor, an A-row low-pressure stage nozzle ring opening degree sensor and an A-row high-pressure stage nozzle ring opening degree sensor, closes a high-pressure gas valve firstly, then closes a high-pressure air valve in a delayed mode, and cuts out a B-row low-pressure stage variable-section turbocharger and a B-row high-pressure stage variable-section turbocharger to enable the A-row low-pressure stage variable-section turbocharger, the A-row high-pressure-stage variable-section turbocharger works independently, an optimal nozzle ring opening MAP and an optimal supercharging pressure MAP which are stored in an ECU and used for the A-row low-pressure-stage variable-section turbocharger and the A-row high-pressure-stage variable-section turbocharger working independently are inquired to obtain a change signal of the nozzle ring opening, and the A-row low-pressure-stage nozzle ring opening and the A-row high-pressure-stage nozzle ring opening are adjusted to reach the optimal nozzle ring opening position.
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