CN115324706B - Engine cooling water circulation system and control method thereof - Google Patents

Engine cooling water circulation system and control method thereof Download PDF

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Publication number
CN115324706B
CN115324706B CN202211257909.6A CN202211257909A CN115324706B CN 115324706 B CN115324706 B CN 115324706B CN 202211257909 A CN202211257909 A CN 202211257909A CN 115324706 B CN115324706 B CN 115324706B
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target
temperature
engine
egr
intercooler
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CN115324706A (en
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谷允成
王德成
李卫
王俣
刘洪哲
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00—Liquid cooling
    • F01P3/20—Cooling circuits not specific to a single part of engine or machine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • 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
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0406—Layout of the intake air cooling or coolant circuit
    • F02B29/0437—Liquid cooled heat exchangers
    • F02B29/0443—Layout of the coolant or refrigerant circuit
    • 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
    • F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
    • F02B29/04—Cooling of air intake supply
    • F02B29/0493—Controlling the air charge temperature
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/23—Layout, e.g. schematics
    • F02M26/28—Layout, e.g. schematics with liquid-cooled heat exchangers
    • 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
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
    • F02M26/22—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage
    • F02M26/33—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories with coolers in the recirculation passage controlling the temperature of the recirculated gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P2007/146—Controlling of coolant flow the coolant being liquid using valves
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Exhaust-Gas Circulating Devices (AREA)

Abstract

The invention discloses an engine cooling water circulation system and a control method thereof, wherein the engine cooling water circulation system comprises the following steps: the system comprises a cooling water pump, an intercooler, an EGR cooler, an engine and a heat exchanger; the output end of the cooling water pump is communicated with the input end of the intercooler and the input end of the EGR cooler through the first flow regulating assembly; the output end of the EGR cooler is communicated with the input end of the heat exchanger and the input end of the engine through a second flow regulating assembly; the output end of the intercooler is communicated with the input end of the engine, and the output end of the engine is communicated with the heat exchanger. The first flow regulating assembly and the second flow regulating assembly can be used for distributing the flow proportion of circulating water passing through an EGR cooler and an engine to meet the cooling requirements of different components; the input end of the EGR cooler is directly connected with the cooling water pump, so that the water temperature at the input end of the EGR cooler can be reduced, and the problem of high inlet temperature of the EGR cooler is solved; the flow of circulating water flowing through different cooling parts is changed, and the cooling requirements of different cooling parts can be met.

Description

Engine cooling water circulation system and control method thereof
Technical Field
The invention relates to the technical field of engines, in particular to an engine cooling water circulation system and a control method thereof.
Background
As shown in fig. 1, the cooling components of the cooling water circulation system of the natural Gas engine include a cooling water pump, an after-compressor intercooler, an engine body, and an EGR (Exhaust Gas Recirculation) cooler. The existing cooling water circulation system adopts a series connection mode to connect all parts, so that the water temperature of cooling water is gradually increased along the flowing direction, and the problem that the cooling capacity of a tail end cooling part is insufficient is caused.
In practice, the inlet/outlet temperature ports of different cooling units are required differently. The optimal outlet water temperature of the intercooler is controlled to be about 55 ℃ at most, the optimal outlet water temperature of the engine body is about 90 ℃, and the optimal outlet water temperature of the EGR cooler is equal to that of the intercooler and is 55 ℃. After the existing series structure is adopted, the cooling water of the EGR cooler comes from the outlet of the engine body, the water temperature is about 90 ℃, and the cooling water at the temperature can not reduce the EGR waste gas to the optimal temperature.
In summary, the series arrangement of the existing cooling water circulation system is difficult to satisfy the cooling requirements of different cooling components, and further causes the performance of the engine to be reduced.
Therefore, how to satisfy the cooling requirements of different cooling parts in the engine cooling water circulation system and ensure the performance of the engine is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of this, the present invention provides an engine cooling water circulation system to meet the cooling requirements of different cooling components in the engine cooling water circulation system and ensure the performance of the engine. In addition, the invention also provides a control method of the engine cooling water circulation system.
In order to achieve the purpose, the invention provides the following technical scheme:
an engine cooling water circulation system comprising: the system comprises a cooling water pump, an intercooler, an EGR cooler, an engine and a heat exchanger;
the output end of the cooling water pump is communicated with the input end of the intercooler and the input end of the EGR cooler through a first flow regulating assembly, and the first flow regulating assembly is used for regulating the flow area between the output end of the cooling water pump and the input end of the intercooler and regulating the flow area between the output end of the cooling water pump and the input end of the EGR cooler;
the output end of the EGR cooler is communicated with the input end of the heat exchanger and the input end of the engine through a second flow regulating assembly, and the second flow regulating assembly is used for regulating the flow area between the output end of the EGR cooler and the input end of the engine and regulating the flow area between the output end of the EGR cooler and the input end of the heat exchanger;
the output end of the intercooler is communicated with the input end of the engine, and the output end of the engine is communicated with the input end of the heat exchanger.
Preferably, in the engine cooling water circulation system, the first flow regulating assembly is a first bidirectional regulating valve, the first bidirectional regulating valve has two output ports with adjustable flow areas, an output port of the cooling water pump is communicated with an input port of the first bidirectional regulating valve, one output port of the first bidirectional regulating valve is communicated with an input port of the intercooler, and the other output port of the first bidirectional regulating valve is communicated with an input port of the EGR cooler.
Preferably, in the engine cooling water circulation system, the second flow regulating assembly is a second bidirectional regulating valve, the second bidirectional regulating valve has two output ends with adjustable flow areas, the output end of the EGR cooler is communicated with the input end of the second bidirectional regulating valve, one output end of the second bidirectional regulating valve is communicated with the input end of the heat exchanger, and the other output end of the second bidirectional regulating valve is communicated with the input end of the engine.
Preferably, the engine cooling water circulation system further includes:
a first temperature sensor for detecting an exhaust gas outlet temperature of the EGR;
a second temperature sensor for detecting an air outlet temperature of the intercooler;
and the third temperature sensor is used for detecting the outlet water temperature of the engine.
Preferably, the engine cooling water circulation system further includes a control system for adjusting the opening degrees of the first and second bidirectional control valves and the rotation speed of the cooling water pump.
A control method of an engine cooling water circulation system is applied to the engine cooling water circulation system and comprises the following steps:
determining a first branch target circulating water flow passing through the EGR cooler and a second branch target circulating water flow passing through the intercooler, and determining a target total circulating water flow of the cooling water pump;
acquiring an initial rotating speed of the cooling water pump according to the target total circulating water flow of the cooling water pump, and acquiring an initial opening degree of the first bidirectional regulating valve according to the ratio of the first branch target circulating water flow to the second branch target circulating water flow;
and adjusting the rotating speed of the cooling water pump or the opening degree of the first bidirectional adjusting valve so that the actual temperature of an exhaust gas outlet of the EGR is not greater than the target temperature of the exhaust gas outlet of the EGR, and the actual temperature of an air outlet of the intercooler is not greater than the target temperature of the air outlet of the intercooler.
Preferably, in the control method of an engine cooling water circulation system, the determining a target circulation water flow rate in a first branch through the EGR cooler and a target circulation water flow rate in a second branch through the intercooler includes:
according to the formula m 1 =m EGR C P,EGR （T 3 -T 4 target ）/［C P,W (T 4 target - T 0 ) Determining a first branch target circulating water flow;
according to the formula m 2 =m IC C P,IC （T 5 -T 6 objects ）/［C P,W (T 6 target - T 0 ) Determining target circulating water flow of a second branch;
wherein m is 1 Is the target circulating water flow of the first branch, the unit is: kg/s; m is 2 Target circulating water flow rate of the second branch circuit, unit: kg/s;
m EGR for exhaust gas flow through EGR, the unit: kg/s; m is IC The amount of air flowing through the intercooler is given by: kg/s; c P,W Is the constant pressure specific heat capacity of cooling water of a cooling water pump, C P,IC Constant pressure specific heat capacity of air of intercooler, C P,EGR A constant pressure specific heat capacity of exhaust gas which is EGR;
T 0 for cooling the water pump inlet temperature, T 3 Inlet temperature of exhaust gas, T, for EGR 4 target For EGRExhaust gas outlet target temperature, T 5 Is the air inlet temperature, T, of an intercooler 6 objects Is the target temperature of the air outlet of the intercooler.
Preferably, in the control method of the engine cooling water circulation system, the determining a target total circulation water flow rate of the cooling water pump includes:
and the target total circulating water flow of the cooling water pump is the sum of the first branch target circulating water flow and the second branch target circulating water flow.
Preferably, in the method for controlling an engine cooling water circulation system, the obtaining an initial rotation speed of the cooling water pump according to a target total circulating water flow rate of the cooling water pump includes:
and screening to obtain the initial rotating speed of the cooling water pump corresponding to the target total circulating water flow of the cooling water pump according to the calculated target total circulating water flow of the cooling water pump in a relation table in which the corresponding relation between the rotating speed and the flow of the cooling water pump is prestored.
Preferably, in the method for controlling an engine cooling water circulation system, the obtaining an initial opening degree of the first bidirectional regulating valve according to a ratio of the first branch target circulation water flow rate to the second branch target circulation water flow rate includes:
determining the ratio of the target circulating water flow of the first branch to the target circulating water flow of the second branch, and calculating the ratio of the flow areas of the first branch where the EGR cooler is located and the second branch where the intercooler is located;
and screening to obtain the initial opening degree of the first bidirectional regulating valve according to the acquired flow area ratio of the first branch and the second branch in a pre-stored relation table of the flow area ratio and the opening position.
Preferably, in the method for controlling an engine cooling water circulation system, the adjusting the rotation speed of the cooling water pump or the opening degree of the first bidirectional adjustment valve so that the actual exhaust gas outlet temperature of the EGR is not higher than the target exhaust gas outlet temperature of the EGR, and the actual air outlet temperature of the intercooler is not higher than the target air outlet temperature of the intercooler includes:
obtaining the actual temperature T of the exhaust gas outlet of the EGR 4 And comparing the actual temperature T of the exhaust gas outlet 4 Exhaust gas outlet target temperature T with the EGR 4 target (ii) a Obtaining the actual temperature T of the air outlet of the intercooler 6 And comparing the actual temperature T of the air outlet of the intercooler 6 And the target temperature T of the air outlet of the intercooler 6 target ；
When actual temperature T of exhaust gas outlet of EGR is higher than actual temperature T of exhaust gas outlet of EGR 4 Exhaust gas outlet target temperature T greater than the EGR 4 target And the actual temperature T of the air outlet of the intercooler 6 Is greater than the target temperature T of the air outlet of the intercooler 6 objects Increasing the rotating speed of the cooling water pump until the actual temperature of the exhaust gas outlet of the EGR is not more than the target temperature of the exhaust gas outlet of the EGR, and the actual temperature of the air outlet of the intercooler is not more than the target temperature of the air outlet of the intercooler;
when actual temperature T of exhaust gas outlet of the EGR 4 Exhaust gas outlet target temperature T greater than the EGR 4 target And the actual temperature T of the air outlet of the intercooler 6 Is not more than the target temperature T of the air outlet of the intercooler 6 target Increasing the flow area of an output port connected with the first bidirectional regulating valve and the EGR cooler until the actual temperature of an exhaust gas outlet of the EGR is not more than the target temperature of the exhaust gas outlet of the EGR and the actual temperature of an air outlet of the intercooler is not more than the target temperature of the air outlet of the intercooler;
when actual temperature T of exhaust gas outlet of EGR is higher than actual temperature T of exhaust gas outlet of EGR 4 Exhaust gas outlet target temperature T not greater than the EGR 4 target And the actual temperature T of the air outlet of the intercooler 6 Is greater than the target temperature T of the air outlet of the intercooler 6 objects And increasing the flow area of an output port connected with the first bidirectional regulating valve and the intercooler until the actual temperature of the exhaust gas outlet of the EGR is not more than the target temperature of the exhaust gas outlet of the EGR, and the actual temperature of the air outlet of the intercooler is not more thanAnd the air outlet target temperature of the intercooler.
Preferably, in the method for controlling a cooling water circulation system of an engine, the opening degree of the second bidirectional regulating valve is regulated so that the outlet water temperature of the engine reaches the target outlet water temperature of the engine.
Preferably, in the method for controlling a cooling water circulation system of an engine, the adjusting the opening degree of the second bidirectional adjustment valve so that the outlet water temperature of the engine reaches the target outlet water temperature of the engine includes:
obtaining the outlet water temperature T of the EGR cooler 1 And a target leaving water temperature T of the engine 2 objects (ii) a And comparing the leaving water temperature T of the EGR cooler 1 And a target leaving water temperature T of the engine 2 object ；
When the outlet water temperature T of the EGR cooler 1 Is greater than the target outlet water temperature T of the engine 2 objects When the engine is started, the communication between the second bidirectional regulating valve and the engine is closed;
when the outlet water temperature T of the EGR cooler 1 Is less than the target outlet water temperature T of the engine 2 object When the temperature of the engine reaches the target water outlet temperature T of the engine, the communication between the second bidirectional regulating valve and the heat exchanger is closed, and whether the water outlet temperature of the engine reaches the target water outlet temperature T of the engine is judged 2 object ；
And when the outlet water temperature of the engine is more than the target outlet water temperature T of the engine 2 objects And increasing the rotating speed of the cooling water pump until the outlet water temperature of the engine reaches the target outlet water temperature T of the engine 2 objects (ii) a When the outlet water temperature of the engine is less than the target outlet water temperature T of the engine 2 object When the temperature of the water reaches the target water outlet temperature T of the engine, the flow area of the second bidirectional regulating valve and the engine is reduced until the water outlet temperature of the engine reaches the target water outlet temperature T of the engine 2 object 。
The invention provides an engine cooling water circulation system, which can randomly distribute the flow proportion of circulating water passing through an EGR cooler and an engine by changing the connection relation of cooling components and connecting the EGR cooler and the engine in parallel, and meet the cooling requirements of the two components; in addition, the input end of the EGR cooler is directly connected with the cooling water pump, so that the water temperature at the input end of the EGR cooler can be reduced, the lower limit of the exhaust gas outlet temperature of the EGR is further reduced, and the problems that the inlet temperature of the EGR cooler is high and the lower limit of the exhaust gas outlet temperature of the EGR is high are solved; to sum up, adopt the connected mode of this application, can change the circulating water flow of different cooling unit that flows through to can satisfy different cooling unit's cooling demand.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a connection diagram of an engine cooling water circulation system disclosed in the prior art;
FIG. 2 is a connection diagram of an engine cooling water circulation system disclosed in the embodiment of the present invention;
FIG. 3 is a control flowchart of a control method of an engine cooling water circulation system disclosed in the embodiment of the invention;
fig. 4 is a control logic diagram of a control method of an engine cooling water circulation system disclosed in the embodiment of the invention.
Detailed Description
The invention discloses an engine cooling water circulation system, which meets the cooling requirements of different cooling parts in the engine cooling water circulation system and ensures the performance of an engine. In addition, the invention also discloses a control method of the engine cooling water circulation system.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
In the following, the terms "first", "second" are used for descriptive purposes only and are not to be understood 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 one or more of that feature.
As shown in fig. 2, the present application discloses an engine cooling water circulation system including: the system comprises a cooling water pump 1, an intercooler 3, an EGR cooler 2, an engine 4, a heat exchanger 5, a first bidirectional regulating valve 61 and a second bidirectional regulating valve 62. The first two-way regulating valve 61 is shown as V1, and the second two-way regulating valve 62 is shown as V2.
An intercooler 3: belongs to a heat exchanger, and has the function of reducing the temperature of high-temperature and high-pressure gas at the outlet of a gas compressor so as to improve the air density. The intercooler is divided into two passages: one side is cooling water, and the other side is high-temperature high-pressure air behind the air compressor. The heat of the high-temperature air is transferred to the cooling water through non-contact heat exchange.
EGR: an abbreviation of Exhaust Gas Recirculation. The method is characterized in that partial combusted waste gas is led out from an exhaust pipe of the engine, mixed with fresh air and then sent into a cylinder of the engine again for combustion.
The EGR cooler 2 is a heat exchanger. The temperature of EGR waste gas is usually above 500 ℃, the air density is very small, and the fresh air flow of an engine is reduced, so that an EGR cooler is needed to reduce the temperature of the EGR waste gas and improve the air density.
The output end of the cooling water pump 1 is communicated with the input end of the intercooler 3 and the input end of the EGR cooler 2 through the first two-way regulating valve 61; the output end of the EGR cooler 2 is communicated with both the input end of the heat exchanger 5 and the input end of the engine 4 through a second bidirectional regulating valve 62; the output end of the intercooler 3 is communicated with the input end of the engine 4, and the output end of the engine 4 is communicated with the input end of the heat exchanger 5.
The first bidirectional regulating valve 61 has two outlets, and the distribution ratio of the coolant flowing out of the two outlets can be adjusted. The output end of the cooling water pump 1 is communicated with the input end of the first bidirectional regulating valve 61, the input end of the intercooler 3 is connected with one output port of the first bidirectional regulating valve 61, and the input end of the EGR cooler 2 is connected with the other output port of the first bidirectional regulating valve 61. By adjusting the proportional relationship of the two outlets, the flow rate ratio of the circulating water delivered to the EGR cooler 2 and the engine 4 can be achieved.
The second bidirectional regulating valve 62 has two outputs, and the distribution ratio of the coolant flowing out of the two outputs can be adjusted. The output end of the EGR cooler 2 is communicated with the input end of a second bidirectional regulating valve 62, and one output end of the second bidirectional regulating valve 62 is communicated with the input end of a heat exchanger 5; the other output of the second bidirectional regulating valve 62 communicates with the input of the engine 4. By adjusting the proportional relationship between the two outputs, the flow rate ratio of the circulating water delivered to the heat exchanger 5 and the engine 4 can be realized.
With the above arrangement, the pipe connecting the cooling water pump 1, the EGR cooler 2, and the heat exchanger 5 may be referred to as a first branch 71; and a pipe line connecting the cooling water pump 1, the intercooler 3, the engine 4, and the heat exchanger 5 is referred to as a second branch 72. And the output of the EGR cooler 2 is connected between the charge air cooler 3 and the engine 4 via a connecting line 73.
It should be noted that the first bidirectional regulating valve 61 and the second bidirectional regulating valve 62 may also be of other structures, for example, the output end of the cooling water pump 1 may be communicated with the input end of the intercooler 3 through a first flow valve, and the output end of the cooling water pump 1 may be communicated with the input end of the EGR cooler 2 through a second flow valve; the output of the EGR cooler 2 is connected to the engine 4 via a third flow valve and the output of the EGR cooler 2 is connected to the heat exchanger 5 via a fourth flow valve. The flow areas are individually controllable by adjusting the opening sizes of the first, second, third and fourth flow valves.
Therefore, the adjusting assembly composed of the first flow valve and the second flow valve and the first bidirectional adjusting valve 61 can be collectively referred to as a first flow adjusting assembly. Similarly, the adjustment assembly of the third and fourth flow valves and the second bidirectional adjustment valve 62 may collectively be referred to as a second flow adjustment assembly.
In the application, by changing the connection relation of the cooling components, the EGR cooler 2 and the engine 4 are connected in parallel, and the flow ratio of circulating water passing through the EGR cooler 2 and the engine 4 can be randomly distributed by utilizing the first flow regulating assembly and the second flow regulating assembly, so that the cooling requirements of the two components are met; in addition, the input end of the EGR cooler 2 is directly connected with the cooling water pump 1, so that the water temperature at the input end of the EGR cooler 2 can be reduced, the lower limit of the temperature of an exhaust gas outlet of EGR is further reduced, and the problems that the inlet temperature of the EGR cooler 2 is high and the lower limit of the temperature of the exhaust gas outlet of EGR is high are solved; to sum up, adopt the connected mode of this application, can change the circulating water flow of different cooling unit that flows through to can satisfy different cooling unit's cooling demand.
It should be noted that the heat exchanger 5 herein may be an on-board cooler of an automobile or other cooling components capable of cooling the cooling water. Further, cooling water herein is understood to be a relatively low temperature liquid, including but not limited to water. The engine 4 herein is an engine having a cooling passage, and the cooling passage of the engine 4 is connected to the second branch passage 72.
In order to adjust the proportional relationship between the first bidirectional adjusting valve 61 and the second bidirectional adjusting valve 62, a first temperature sensor, a second temperature sensor, a third temperature sensor and a control system are further provided in the present application. The first temperature sensor is used for detecting the exhaust gas outlet temperature of EGR, the second temperature sensor is used for detecting the air outlet temperature of the intercooler 3, and the third temperature sensor is used for detecting the water outlet temperature of the engine 4. The first temperature sensor, the second temperature sensor and the third temperature sensor are all connected with the control system, and the control system receives temperature signals detected by the first temperature sensor, the second temperature sensor and the third temperature sensor and can control the opening degrees of the first bidirectional regulating valve 61 and the second bidirectional regulating valve 62 and the rotating speed of the cooling water pump 1.
As shown in fig. 3 and 4, and referring to the structure diagram in fig. 2, the present application also discloses a method for controlling an engine cooling water circulation system, which is mainly applied to the engine cooling water circulation system in the above embodiment, and specifically includes:
step S1: a target first branch circulation water flow rate through the EGR cooler 2 and a target second branch circulation water flow rate through the intercooler 3 are determined, and a target total circulation water flow rate of the cooling water pump 1 is determined.
In some embodiments, the method of determining a target flow rate of a first branch of circulating water through the EGR cooler 2 and a target flow rate of a second branch of circulating water through the intercooler 3 comprises:
according to the formula m 1 =m EGR C P,EGR （T 3 -T 4 target ）/［C P,W (T 4 target - T 0 ) Determining a first branch target circulating water flow;
according to the formula m 2 =m IC C P,IC （T 5 -T 6 target ）/［C P,W (T 6 target - T 0 ) Determining the target circulating water flow of a second branch;
wherein m is 1 Is the target circulating water flow of the first branch, the unit is: kg/s; m is a unit of 2 Target circulating water flow rate of the second branch circuit, unit: kg/s;
m EGR for exhaust gas flow through EGR, the unit: kg/s; m is a unit of IC The amount of air flowing through the intercooler 3, unit: kg/s; c P,W Is the constant pressure specific heat capacity of cooling water of a cooling water pump, C P,IC Constant pressure specific heat capacity of air of intercooler 3, C P,EGR A constant pressure specific heat capacity of exhaust gas which is EGR;
T 0 for cooling the inlet temperature, T, of the water pump 1 3 Inlet temperature of exhaust gas, T, for EGR 4 target Exhaust gas outlet target temperature, T, for EGR 5 Is the air inlet temperature, T, of the intercooler 3 6 target Is the air outlet target temperature of the intercooler 3.
It should be noted that: in order to simplify the calculation, the outlet water temperature of the EGR cooler 2 is set to be the same as the target exhaust gas outlet temperature of EGR, and the outlet water temperature of the intercooler 3 is set to be the same as the target air outlet temperature of the intercooler 3.
In some embodiments, the manner of determining the target total circulating water flow rate of the cooling water pump 1 includes: the target total circulating water flow of the cooling water pump 1 is the first branch target circulating water flow m 1 And a second branch target circulation water flow rate m 2 And (4) summing.
Step S2: the initial rotating speed of the cooling water pump 1 is obtained according to the target total circulating water flow of the cooling water pump 1, and the initial opening degree of the first bidirectional regulating valve 61 is obtained according to the ratio of the target circulating water flow of the first branch and the target circulating water flow of the second branch.
In some embodiments, the manner of obtaining the initial rotation speed of the cooling water pump 1 according to the total circulating water flow of the cooling water pump 1 includes: and screening the initial rotating speed of the cooling water pump 1 corresponding to the target total circulating water flow of the cooling water pump 1 according to the calculated target total circulating water flow of the cooling water pump 1 in a relation table pre-storing the corresponding relation between the rotating speed and the flow of the cooling water pump 1.
In some embodiments, the manner of obtaining the initial opening degree of the first bidirectional regulating valve 61 according to the ratio of the first branch target circulating water flow and the second branch target circulating water flow includes: determining a first branch target circulating water flow m 1 And a second branch target circulating water flow m 2 Calculating the ratio of the flow areas of the first branch in which the EGR cooler 2 is located and the second branch in which the intercooler 3 is located; and screening to obtain the initial opening degree of the first bidirectional regulating valve 61 according to the acquired flow area ratio of the first branch and the second branch in a relationship table pre-stored with the flow area ratio and the opening position.
In a pre-stored relation table of the flow area ratio and the opening position, different flow area ratios and opening positions corresponding to the flow area ratios one to one are stored.
And step S3: the rotation speed of the cooling water pump 1 or the opening degree of the first bidirectional regulating valve 61 is regulated so that the actual exhaust gas outlet temperature of EGR is not greater than the target exhaust gas outlet temperature of EGR, and the actual air outlet temperature of the intercooler 3 is not greater than the target air outlet temperature of the intercooler 3.
In some embodiments, the method of adjusting the rotation speed of the cooling water pump 1 or the opening degree of the first bidirectional adjustment valve 61 so that the actual exhaust outlet temperature of the EGR is not greater than the target exhaust outlet temperature of the EGR, and the actual air outlet temperature of the intercooler 3 is not greater than the target air outlet temperature of the intercooler 3 includes:
obtaining actual temperature T of exhaust gas outlet of EGR 4 And comparing the actual temperature T of the exhaust gas outlet 4 Target exhaust gas outlet temperature T with EGR 4 target (ii) a Actual temperature T of air outlet of intercooler 3 is obtained 6 And comparing the actual temperature T of the air outlet of the intercooler 3 6 And the target temperature T of the air outlet of the intercooler 3 6 target ；
When actual temperature T of EGR exhaust outlet 4 Exhaust gas outlet target temperature T greater than EGR 4 target And the actual temperature T of the air outlet of the intercooler 3 6 Is greater than the target temperature T of the air outlet of the intercooler 3 6 objects Increasing the rotating speed of the cooling water pump 1 until the actual temperature of the exhaust gas outlet of the EGR is not higher than the target temperature of the exhaust gas outlet of the EGR, and the actual temperature of the air outlet of the intercooler 3 is not higher than the target temperature of the air outlet of the intercooler 3;
when actual temperature T of EGR exhaust outlet 4 Exhaust gas outlet target temperature T greater than EGR 4 target And the actual temperature T of the air outlet of the intercooler 3 6 Air outlet target temperature T not greater than intercooler 3 6 objects When the EGR temperature is lower than the target temperature of the EGR outlet, the flow area of the output port of the first bidirectional regulating valve 61 connected with the EGR cooler 2 is increased until the actual temperature of the EGR outlet is not higher than the target temperature of the EGR outlet, and the actual temperature of the air outlet of the intercooler 3 is not higher than the target temperature of the air outlet of the intercooler 3;
when actual temperature T of EGR exhaust outlet 4 Exhaust gas outlet target temperature T of not more than EGR 4 target And the actual temperature T of the air outlet of the intercooler 3 6 Air outlet target temperature T greater than intercooler 3 6 objects While the first two-way regulating valve 61 is enlarged and connected with the intercooler 3Until the actual temperature of the exhaust gas outlet of the EGR is not greater than the target temperature of the exhaust gas outlet of the EGR, and the actual temperature of the air outlet of the intercooler 3 is not greater than the target temperature of the air outlet of the intercooler 3.
And step S4: the opening degree of the second bidirectional regulating valve 62 is regulated so that the outlet water temperature of the engine 4 reaches the target outlet water temperature of the engine 4.
In some embodiments, the method for adjusting the opening degree of the second bidirectional adjusting valve 62 to make the outlet water temperature of the engine 4 reach the target outlet water temperature of the engine 4 comprises:
obtaining the leaving water temperature T of the EGR cooler 2 1 And target leaving water temperature T of the engine 4 2 object (ii) a And compares the leaving water temperature T of the EGR cooler 2 1 And target outlet water temperature T of the engine 4 2 objects ；
When the leaving water temperature T of the EGR cooler 2 1 Greater than target water outlet temperature T of engine 4 2 object When so, the communication between the second bidirectional regulating valve 62 and the engine 4 is closed;
when the leaving water temperature T of the EGR cooler 2 1 Is less than the target outlet water temperature T2 of the engine 4 Target If so, the communication between the second bidirectional regulating valve 62 and the heat exchanger 5 is closed, and whether the outlet water temperature of the engine 4 reaches the target outlet water temperature T of the engine 4 or not is judged 2 objects ；
And when the outlet water temperature of the engine 4 is higher than the target outlet water temperature T of the engine 4 2 object When the temperature reaches the target water outlet temperature T of the engine 4, the rotating speed of the cooling water pump 1 is increased until the water outlet temperature of the engine 4 reaches the target water outlet temperature T of the engine 4 2 object (ii) a When the outlet water temperature of the engine 4 is less than the target outlet water temperature T of the engine 4 2 object When the temperature of the water reaches the target outlet water temperature T of the engine 4, the flow area between the second bidirectional regulating valve 62 and the engine 4 is reduced until the outlet water temperature of the engine 4 reaches the target outlet water temperature T of the engine 4 2 objects 。
The opening degree of the first two-way regulating valve 61 can be regulated through the control logic, so that the proportional relation of the cooling liquid entering the intercooler 3 and the EGR cooler 2 is changed, and the cooling requirements of the intercooler 3 and the EGR cooler 2 are ensured.
By adjusting the opening degree of the second two-way adjustment valve 62, the proportional relationship of the coolant discharged from the EGR cooler 2 into the coolant of the engine 4 can be changed to meet the cooling demand of the engine 4.
As used in this disclosure and in the claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are inclusive in the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements. An element defined by the phrase "comprising a component of ' 8230 ' \8230; ' does not exclude the presence of additional identical elements in the process, method, article, or apparatus that comprises the element.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (12)

1. An engine cooling water circulation system, comprising: the system comprises a cooling water pump, an intercooler, an EGR cooler, an engine and a heat exchanger;
the output end of the cooling water pump is communicated with the input end of the intercooler and the input end of the EGR cooler through a first flow regulating assembly, and the first flow regulating assembly is used for regulating the flow area between the output end of the cooling water pump and the input end of the intercooler and regulating the flow area between the output end of the cooling water pump and the input end of the EGR cooler;
the output end of the EGR cooler is communicated with the input end of the heat exchanger and the input end of the engine through a second flow regulating assembly, and the second flow regulating assembly is used for regulating the flow area between the output end of the EGR cooler and the input end of the engine and regulating the flow area between the output end of the EGR cooler and the input end of the heat exchanger;
the output end of the intercooler is communicated with the input end of the engine, and the output end of the engine is communicated with the input end of the heat exchanger; the first flow regulating assembly is a first bidirectional regulating valve, the first bidirectional regulating valve is provided with two output ports with adjustable flow areas, the output end of the cooling water pump is communicated with the input end of the first bidirectional regulating valve, one output port of the first bidirectional regulating valve is communicated with the input end of the intercooler, and the other output port of the first bidirectional regulating valve is communicated with the input end of the EGR cooler.
2. The engine coolant water circulation system of claim 1 wherein the second flow adjustment assembly is a second bi-directional regulating valve having two output ends with adjustable flow areas, the output end of the EGR cooler being in communication with the input end of the second bi-directional regulating valve, one output end of the second bi-directional regulating valve being in communication with the input end of the heat exchanger, the other output end of the second bi-directional regulating valve being in communication with the input end of the engine.
3. The engine cooling water circulation system according to claim 2, further comprising:
a first temperature sensor for detecting an exhaust gas outlet temperature of the EGR;
a second temperature sensor for detecting an air outlet temperature of the intercooler;
and the third temperature sensor is used for detecting the outlet water temperature of the engine.
4. The engine cooling water circulation system according to claim 3, further comprising a control system for adjusting the opening degrees of the first and second bidirectional regulating valves and the rotation speed of the cooling water pump.
5. A control method of an engine cooling water circulation system applied to the engine cooling water circulation system according to claim 4, characterized by comprising:
determining a first branch target circulating water flow passing through the EGR cooler and a second branch target circulating water flow passing through the intercooler, and determining a target total circulating water flow of the cooling water pump;
acquiring an initial rotating speed of the cooling water pump according to the target total circulating water flow of the cooling water pump, and acquiring an initial opening degree of the first bidirectional regulating valve according to the ratio of the first branch target circulating water flow to the second branch target circulating water flow;
and adjusting the rotating speed of the cooling water pump or the opening degree of the first bidirectional adjusting valve so that the actual temperature of an exhaust gas outlet of the EGR is not greater than the target temperature of the exhaust gas outlet of the EGR, and the actual temperature of an air outlet of the intercooler is not greater than the target temperature of the air outlet of the intercooler.
6. The method of controlling an engine cooling water circulation system according to claim 5, wherein the determining a first branch target circulation water flow rate through the EGR cooler and a second branch target circulation water flow rate through the intercooler includes:
according to the formula m 1 =m EGR C P,EGR （T 3 -T 4 target ）/［C P,W (T 4 target - T 0 ) Determining the target circulating water flow of the first branch;
according to the formula m 2 =m IC C P,IC （T 5 -T 6 objects ）/［C P,W (T 6 objects - T 0 ) Determining target circulating water flow of a second branch;
wherein m is 1 Is the first branch target circulating water flow, unit: kg/s; m is a unit of 2 Target circulation water flow for the second branch, unit: kg/s;
m EGR for the flow of exhaust gas through EGR, the unit: kg/s; m is IC The amount of air flowing through the intercooler is given by: kg/s; c P,W Is the constant pressure specific heat capacity of the cooling water pump, C P,IC Constant pressure specific heat capacity of air of intercooler, C P,EGR A constant pressure specific heat capacity of exhaust gas which is EGR;
T 0 for cooling the water pump inlet temperature, T 3 Inlet temperature of exhaust gas, T, for EGR 4 target Exhaust gas outlet target temperature, T, for EGR 5 Is the air inlet temperature, T, of an intercooler 6 objects Is the target temperature of the air outlet of the intercooler.
7. The control method of an engine cooling water circulation system according to claim 6, wherein the determining the target total circulating water flow rate of the cooling water pump includes:
and the target total circulating water flow of the cooling water pump is the sum of the first branch target circulating water flow and the second branch target circulating water flow.
8. The control method of an engine cooling water circulation system according to claim 5, wherein the obtaining of the initial rotation speed of the cooling water pump from the target total circulating water flow rate of the cooling water pump includes:
and screening to obtain the initial rotating speed of the cooling water pump corresponding to the target total circulating water flow of the cooling water pump according to the calculated target total circulating water flow of the cooling water pump in a relation table in which the corresponding relation between the rotating speed and the flow of the cooling water pump is prestored.
9. The control method of an engine cooling water circulation system according to claim 5, wherein the obtaining of the initial opening degree of the first bidirectional regulating valve from the ratio of the first branch target circulation water flow rate and the second branch target circulation water flow rate includes:
determining the ratio of the target circulating water flow of the first branch to the target circulating water flow of the second branch, and calculating the ratio of the flow areas of the first branch where the EGR cooler is located and the second branch where the intercooler is located;
and screening to obtain the initial opening degree of the first bidirectional regulating valve according to the acquired flow area ratio of the first branch and the second branch in a pre-stored relation table of the flow area ratio and the opening position.
10. The control method of an engine cooling water circulation system according to claim 5, wherein said adjusting the rotation speed of the cooling water pump or the opening degree of the first bidirectional adjustment valve so that the actual exhaust gas outlet temperature of the EGR is not greater than the target exhaust gas outlet temperature of the EGR, and the actual air outlet temperature of the intercooler is not greater than the target air outlet temperature of the intercooler, includes:
obtaining the actual temperature T of the exhaust gas outlet of the EGR 4 And comparing the actual temperature T of the exhaust gas outlet 4 Exhaust gas outlet target temperature T with the EGR 4 target (ii) a Obtaining the actual temperature T of the air outlet of the intercooler 6 And comparing the actual temperature T of the air outlet of the intercooler 6 With the target temperature T of the air outlet of the intercooler 6 objects ；
When actual temperature T of exhaust gas outlet of EGR is higher than actual temperature T of exhaust gas outlet of EGR 4 Exhaust gas outlet target temperature T greater than the EGR 4 target And the actual temperature T of the air outlet of the intercooler 6 Is greater than the target temperature T of the air outlet of the intercooler 6 objects Increasing the rotating speed of the cooling water pump until the actual temperature of the exhaust gas outlet of the EGR is not more than the target temperature of the exhaust gas outlet of the EGR, and the actual temperature of the air outlet of the intercooler is not more than the target temperature of the air outlet of the intercooler;
when actual temperature T of exhaust gas outlet of the EGR 4 Exhaust gas outlet target temperature T greater than the EGR 4 target And the actual temperature T of the air outlet of the intercooler 6 Is not more than the target temperature T of the air outlet of the intercooler 6 target Increasing the flow area of an output port of the first bidirectional regulating valve connected with the EGR cooler until the actual temperature of the exhaust gas outlet of the EGR is not more than the target temperature of the exhaust gas outlet of the EGR, and the actual temperature of the air outlet of the intercooler is not more than the target temperature of the air outlet of the intercooler;
when actual temperature T of exhaust gas outlet of the EGR 4 Exhaust gas outlet target temperature T not greater than the EGR 4 target And the actual temperature T of the air outlet of the intercooler 6 Is greater than the target temperature T of the air outlet of the intercooler 6 target And increasing the flow area of an output port connected with the intercooler until the actual temperature of the exhaust outlet of the EGR is not more than the target temperature of the exhaust outlet of the EGR, and the actual temperature of the air outlet of the intercooler is not more than the target temperature of the air outlet of the intercooler.
11. The control method of the engine cooling water circulation system according to claim 5, further comprising adjusting an opening degree of the second bidirectional adjustment valve so that a leaving water temperature of the engine reaches a target leaving water temperature of the engine.
12. The method for controlling the engine cooling water circulation system according to claim 11, wherein the adjusting the opening degree of the second bidirectional adjusting valve to make the outlet water temperature of the engine reach the target outlet water temperature of the engine comprises:
obtaining the outlet water temperature T of the EGR cooler 1 And a target leaving water temperature T of the engine 2 object (ii) a And comparing the leaving water temperature T of the EGR cooler 1 And a target leaving water temperature T of the engine 2 object ；
When the outlet water temperature T of the EGR cooler 1 Is greater than the target outlet water temperature T of the engine 2 object When the engine is started, the communication between the second bidirectional regulating valve and the engine is closed;
when the outlet water temperature T of the EGR cooler 1 Is less than the target outlet water temperature T of the engine 2 object If so, closing the communication between the second bidirectional regulating valve and the heat exchanger, and judging whether the outlet water temperature of the engine reaches the target outlet water temperature T2 target of the engine;
when the water outlet temperature of the engine is higher than the target water outlet temperature T2 target of the engine, increasing the rotating speed of the cooling water pump until the water outlet temperature of the engine reaches the target water outlet temperature T2 target of the engine; and when the outlet water temperature of the engine is lower than the target outlet water temperature T2 target of the engine, reducing the flow area of the second bidirectional regulating valve and the engine until the outlet water temperature of the engine reaches the target outlet water temperature T2 target of the engine.
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