CN110848013B - Intelligent thermal management system and control method for alcohol-diesel dual-fuel engine - Google Patents
Intelligent thermal management system and control method for alcohol-diesel dual-fuel engine Download PDFInfo
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- CN110848013B CN110848013B CN201910986274.5A CN201910986274A CN110848013B CN 110848013 B CN110848013 B CN 110848013B CN 201910986274 A CN201910986274 A CN 201910986274A CN 110848013 B CN110848013 B CN 110848013B
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- 238000000034 method Methods 0.000 title claims abstract description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000001816 cooling Methods 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 34
- 239000000110 cooling liquid Substances 0.000 claims description 14
- 230000009977 dual effect Effects 0.000 claims description 12
- 230000007613 environmental effect Effects 0.000 claims description 9
- 239000002826 coolant Substances 0.000 claims description 7
- 239000003921 oil Substances 0.000 claims description 6
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
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- 238000002485 combustion reaction Methods 0.000 abstract description 8
- 238000007726 management method Methods 0.000 description 66
- 239000007789 gas Substances 0.000 description 14
- 239000002912 waste gas Substances 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 238000011217 control strategy Methods 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 238000000889 atomisation Methods 0.000 description 4
- 230000036760 body temperature Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000013021 overheating Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
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- 230000002349 favourable effect Effects 0.000 description 1
- 239000002828 fuel tank Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
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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
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
- F01P11/14—Indicating devices; Other safety devices
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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
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
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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
- F01P5/00—Pumping cooling-air or liquid coolants
- F01P5/10—Pumping liquid coolant; Arrangements of coolant pumps
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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
- F01P7/00—Controlling of coolant flow
- F01P7/02—Controlling of coolant flow the coolant being cooling-air
- F01P7/10—Controlling of coolant flow the coolant being cooling-air by throttling amount of air flowing through liquid-to-air heat exchangers
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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
- 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
- F02B29/0425—Air cooled heat exchangers
- F02B29/0431—Details or means to guide the ambient air to the heat exchanger, e.g. having a fan, flaps, a bypass or a special location in the engine compartment
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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
- F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
- F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
- F02M31/16—Other apparatus for heating fuel
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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
- F01P2025/00—Measuring
- F01P2025/08—Temperature
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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
- F01P2025/00—Measuring
- F01P2025/60—Operating parameters
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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
- F01P2025/00—Measuring
- F01P2025/60—Operating parameters
- F01P2025/62—Load
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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
- 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
- F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed
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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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses an intelligent thermal management system and a control method for an alcohol-diesel dual-fuel engine, which relate to an engine cooling system and comprise a thermal management ECU, a rotating speed sensor, a load sensor, a pressure sensor and a temperature sensor; the thermal management ECU controls a cooling system in a closed loop mode according to the working condition and the environment state of the engine, and the cooling system is used for cooling the engine; the rotating speed sensor is connected with the input end of the thermal management ECU and used for detecting the rotating speed of the alcohol-diesel dual-fuel engine and transmitting data to the thermal management ECU; the load sensor is connected with the input end of the thermal management ECU and used for detecting the load of the alcohol-diesel dual-fuel engine and transmitting data to the thermal management ECU; the system can ensure that the alcohol-diesel dual-fuel engine runs in the best state, improve the combustion efficiency of the alcohol fuel to the maximum efficiency, prolong the service life of the alcohol-diesel dual-fuel engine and finally achieve the aims of reducing oil consumption and emission.
Description
Technical Field
The invention relates to the field of engine cooling systems, in particular to an intelligent thermal management system and method suitable for an alcohol-diesel dual-fuel engine.
Background
At present, a known alcohol-diesel dual-fuel engine cooling system is generally composed of a cooling water pump, a thermostat, a fan, a radiator and the like as a traditional engine, and the existing technical scheme is that the water pump, the fan and the thermostat in the cooling system are mechanically controlled and change along with the rotating speed of the engine. The design of various performance parameters of all components is determined at the beginning, the performance parameters can not be accurately changed according to the actual working condition and the environmental state of the alcohol-diesel dual-fuel engine, the temperature of a cooling system of the alcohol-diesel dual-fuel engine and the alcohol fuel can not be accurately controlled, and the combustion and the emission of the engine are greatly influenced. In a low-temperature environment, the alcohol fuel is too low in temperature and poor in atomization, is easy to adhere to the wall and enter a gap of a cylinder to dilute lubricating oil, and the stable operation of the whole alcohol-diesel dual-fuel engine is damaged in severe cases. When the alcohol-diesel dual-fuel engine is under a small load, the alcohol co-combustion amount is large, because the latent heat of vaporization of the alcohol injected by the air inlet channel is large, the air inlet temperature is obviously reduced, the engine body temperature is also low, the alcohol atomization is not obvious, the combustion is insufficient, and the heat efficiency is reduced and the emission is deteriorated. When the alcohol-diesel dual-fuel engine is in high load, the heat release speed of the dual-fuel combustion is high, the temperature in the cylinder is increased rapidly, the engine is easy to overheat, and the working reliability of the engine is reduced. The existing alcohol-diesel dual-fuel engine cannot better adapt to the working requirements of the alcohol-diesel dual-fuel engine based on the original engine cooling system, and the oil consumption and the emission of the engine are increased.
Disclosure of Invention
In order to overcome the defects that the prior art can not accurately change according to the actual working condition and the environmental state of the alcohol-diesel dual-fuel engine and can not accurately control the cooling system of the alcohol-diesel dual-fuel engine and the temperature of alcohol fuel, the invention provides an intelligent thermal management system and an intelligent thermal management method for the alcohol-diesel dual-fuel engine, which can intelligently adjust the temperature of the cooling system according to the actual working condition and the environmental state of the alcohol-diesel dual-fuel engine so that the alcohol-diesel dual-fuel engine runs in the optimal state.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the intelligent heat management system for the alcohol-diesel dual-fuel engine comprises a heat management ECU, a heat management unit and a control unit, wherein the heat management ECU is used for receiving various sensor signals and regulating and controlling various components of the system; the rotation speed sensor is used for detecting the real-time rotation speed of the alcohol-diesel dual-fuel engine and transmitting the rotation speed data to the thermal management ECU; the load sensor is used for detecting the real-time load of the alcohol-diesel dual-fuel engine and transmitting the load data to the thermal management ECU; the thermal management ECU determines the actual working condition of the alcohol-diesel dual-fuel engine according to the rotating speed and the load; the pressure sensor is used for detecting the inlet pressure and the outlet pressure of an intercooler of the alcohol-diesel dual-fuel engine, the alcohol fuel pressure and the atmospheric pressure and transmitting the data to the thermal management ECU; the temperature sensor is used for detecting the temperature of a radiator body of the alcohol-diesel dual-fuel engine, the temperature of a cooling liquid, the temperature of exhaust gas, the temperature of an inlet and an outlet of an intercooler, the temperature of alcohol fuel, the temperature of environment and the temperature of intake charge, and transmitting data to the thermal management ECU, so that the temperature of each part can be conveniently detected and feedback control can be conveniently carried out; an electronic fan, the rotation speed of which is controlled by the thermal management ECU to change the heat dissipation capacity; the electronic water pump changes the circulation speed of the cooling liquid by controlling the rotating speed of the electronic water pump through the thermal management ECU; the electronic thermostat controls the opening of a valve of the electronic thermostat through the thermal management ECU to change the circulation range of the cooling liquid; and the exhaust gas valve is used for controlling the valve opening degree of the exhaust gas valve through the thermal management ECU to adjust the amount of the exhaust gas to heat the alcohol fuel.
The alcohol-diesel dual-fuel engine intelligent heat management system provided by the invention transmits various signals detected by a load sensor, a rotating speed sensor, a pressure sensor and a temperature sensor to a heat management ECU (electronic control unit) through an intelligent heat management method. And the heat management ECU judges the working condition and the environmental state of the alcohol-diesel dual-fuel engine according to the pre-calibrated MAP and sensor signals, and selects a reasonable control strategy to ensure that the cooling system is always in the optimal temperature range.
Specifically, the working principle of the present invention is as follows:
an intelligent thermal management system of an alcohol-diesel dual-fuel engine receives signals transmitted by sensors through a thermal management ECU, judges the working condition and the environmental state of the alcohol-diesel dual-fuel engine, selects a proper control strategy, and sends an instruction to effectively control an intercooler electronic fan, an exhaust gas valve, an electronic thermostat, an electronic water pump and a radiator electronic fan in a closed-loop manner, so that the aim of operating the alcohol-diesel dual-fuel engine in the optimal state is finally fulfilled.
Low-temperature working strategy: when the alcohol-diesel dual-fuel engine runs at low temperature, the opening of the waste gas valve is controlled to adjust a proper amount of waste gas to heat the alcohol fuel, so that the temperature of the alcohol fuel is controlled in a reasonable interval, and poor atomization of the alcohol fuel and reduction of the stability of the engine are avoided.
And (3) a small-load working strategy: when the alcohol-diesel dual-fuel engine runs at a low load, the latent heat of vaporization of alcohol fuel injected by an air inlet channel is large, the air inlet temperature is obviously reduced, the temperature of an engine body is lower, and in order to improve the atomization quality of alcohol, an engine heat management system needs to reduce the heat dissipation capacity and properly improve the temperature of a cooling system, namely the temperature of the engine body and the temperature of air inlet charge are improved, so that the aim of improving the working efficiency of the engine is fulfilled.
High load work strategy: when the alcohol-diesel dual-fuel engine runs at high load, the heat release speed of the dual-fuel combustion is high, and the temperature in the cylinder is increased sharply to cause overheating of the engine. The heat management system quickly dissipates heat at the moment, reduces the temperature of the engine coolant and the temperature of the intake charge, and avoids overheating of the engine; the thermal management ECU is controlled in a closed loop mode through various temperature signals, and the cooling liquid, the intake charge and the alcohol fuel are always kept in a reasonable temperature range in actual operation.
And (3) failure protection strategy: and when the thermal management ECU detects that the intelligent thermal management system fails, the intelligent thermal management system enters an electric control failure protection strategy for control according to a preset control strategy.
The invention has the following beneficial effects:
1. the cooling system is completely and independently regulated and controlled and does not change along with the change of the rotating speed of the engine, so that the cooling system is favorable for adapting to the working requirement of the alcohol-diesel dual-fuel engine; the electronic fan of the intercooler, the electronic fan of the radiator, the electronic water pump and the exhaust gas valve are effectively controlled by the thermal management ECU according to signals of the sensors, so that closed-loop control of temperature is formed, the temperature of the cooling liquid, the temperature of the air inlet charging material and the temperature of the alcohol fuel are always stabilized in the optimal temperature range, the service life of the alcohol-diesel dual-fuel engine is prolonged, and oil consumption and emission are reduced.
2. The intelligent thermal management system disclosed by the invention has the advantages that the cooling system is independently controlled and is not limited by the rotating speed of the engine, the actual working condition and the environmental state of the alcohol-diesel dual-fuel engine are detected by various sensors, signals are transmitted to the thermal management ECU, then the thermal management ECU obtains the optimal target temperature corresponding to the actual working condition and the environmental state through the prestored MAP, and finally the thermal management ECU sends an instruction to comprehensively control the electronic water pump, the electronic fan of the intercooler, the electronic fan of the radiator, the electronic thermostat and the exhaust gas valve, so that the temperature of the cooling liquid, the temperature of the intake charge and the temperature of the alcohol fuel are in the optimal temperature range of the working condition.
3. The system can ensure that the alcohol-diesel dual-fuel engine runs in the best state, improve the combustion efficiency of the alcohol fuel to the maximum efficiency, prolong the service life of the alcohol-diesel dual-fuel engine and finally achieve the aims of reducing oil consumption and emission.
Drawings
FIG. 1 is a schematic structural diagram of an intelligent thermal management system for an alcohol-diesel dual-fuel engine according to the present invention;
FIG. 2 is a schematic diagram of an electronic control system implementing an intelligent thermal management system for an alcohol-diesel dual-fuel engine;
fig. 3 is a schematic working flow diagram of an intelligent thermal management system for an alcohol-diesel dual-fuel engine according to the present invention.
The reference signs are:
1. the system comprises an intercooler electronic fan, a 2 alcohol rail, a 3 alcohol mixture temperature sensor, a 4 heat exchanger, a 5 alcohol fuel tank, a 6 thermal management ECU, a 7 sensor signal, a 8 intercooler, a 9 turbocharger, a 10 alcohol-diesel dual-fuel engine, a 11 exhaust gas valve, a 12 electronic thermostat, a 13 electronic water pump, a 14 water tank, a 15 radiator and a 16 radiator electronic fan.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; 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 by those skilled in the art according to specific situations.
The following first describes in detail embodiments according to the present invention with reference to the accompanying drawings
Referring to fig. 1, the specific structure of the intelligent thermal management system for the alcohol-diesel dual-fuel engine shown in fig. 1 comprises a thermal management ECU6 connected with sensor signals 7 such as a rotating speed sensor, a load sensor, a temperature sensor and a pressure sensor, an intercooler electronic fan 1 connected with the output end of the thermal management ECU6, an exhaust gas valve 11, an electronic thermostat 12, an electronic water pump 13 and a radiator electronic fan 16, a heat exchanger 4, a water tank 14 and a radiator 15. The system comprises a rotating speed sensor, a load sensor, a radiator 15, a radiator 8, a intercooler 8, an alcohol fuel, an environment temperature and an air inlet charge temperature, wherein the rotating speed sensor and the load sensor are respectively used for measuring the rotating speed and the load of the alcohol-diesel dual-fuel engine 10, the eight temperature sensors are respectively used for measuring the body temperature of the radiator 15, the temperature of cooling liquid, the exhaust temperature, the inlet temperature of the intercooler 8, the outlet temperature of the intercooler 8, the temperature of the alcohol fuel, the environment temperature and the air inlet charge temperature, the four pressure sensors are respectively used for measuring the inlet pressure of the intercooler 8, the outlet pressure of the intercooler 8, the pressure of the alcohol fuel and the atmospheric pressure, and data are transmitted to a thermal management ECU6 through a wiring harness. The thermal management ECU6 issues commands to effectively control the intercooler electronic fan 1, the exhaust gas valve 11, the electronic thermostat 12, the electronic water pump 13 and the radiator electronic fan 16 in a closed-loop manner according to the sensor signal 7 and various pre-calibrated control strategies, and accurately controls the coolant temperature, the intake charge temperature and the alcohol fuel temperature, so that the alcohol-diesel dual-fuel engine 10 can work in the best state under different working conditions and environmental conditions.
Referring to fig. 2, in the electronic control system of the intelligent thermal management system for the alcohol-diesel dual-fuel engine shown in fig. 2, the speed and load sensors are used for detecting the speed and load of the alcohol-diesel dual-fuel engine 10 and transmitting the detected data to the thermal management ECU6 for judging the operating condition of the engine. The first to eighth temperature sensors detect, in sequence, the radiator 15 body temperature, the coolant temperature, the exhaust gas temperature, the intercooler 8 inlet temperature, the intercooler 8 outlet temperature, the alcohol fuel temperature, the ambient temperature, and the intake charge temperature of the alcohol-diesel dual fuel engine 10, and transmit the relevant temperature detection data to the heat management ECU 6. The first to fourth pressure sensors detect the intercooler 8 inlet pressure, the intercooler 8 outlet pressure, the alcohol fuel pressure, and the atmospheric pressure of the alcohol-diesel dual fuel engine 10 in turn, and transmit the relevant pressure detection data to the heat management ECU 6. The thermal management ECU6 issues commands to effectively close-loop control the intercooler electronic fan 1, the exhaust gas valve 11, the electronic thermostat 12, the electronic water pump 13 and the radiator electronic fan 16 to operate in a reasonable interval according to the sensor signal 7.
An electronic Control unit (ecu) 6, also called a thermal management electronic Control unit, is composed of a microcomputer, an input, output and Control circuit, and the like, and performs operation, processing and judgment on various sensor input signals according to programs and data in a memory thereof, and then sends out an instruction. The heat management ECU6 of the intelligent heat management system of the alcohol-diesel dual-fuel engine receives transmission data of a rotating speed sensor, a load sensor, a temperature sensor and a pressure sensor, and according to various pre-calibrated control strategies, the heat management ECU6 sends an instruction to jointly control the intercooler electronic fan 1, the exhaust gas valve 11, the electronic thermostat 12, the electronic water pump 13 and the radiator electronic fan 16, so that the temperature of the cooling system is always stabilized in the optimal working temperature range of the alcohol-diesel dual-fuel engine 10, and the purposes of accurately controlling the cooling liquid temperature, the air inlet charge temperature and the alcohol fuel temperature are achieved.
The electronic water pump 13 is connected with the output end of the thermal management ECU6, so that the rotating speed of the electronic water pump is electronically controlled, and the rotating speed of the electronic water pump 13 is adjusted by adjusting control voltages with different duty ratios, thereby changing the circulating speed of the cooling liquid. The light alcohol-diesel dual-fuel engine preferably adopts an electronic direct-current electric water pump, and the medium and heavy alcohol-diesel dual-fuel engine preferably adopts an electronic electromagnetic clutch water pump or an electronic silicon oil clutch water pump.
The electronic thermostat 12 is connected with the output end of the thermal management ECU6, so that the valve opening degree of the electronic thermostat is electronically controlled, and the valve opening degree of the electronic thermostat 12 is adjusted by adjusting control voltages with different duty ratios, thereby changing the circulation range of the cooling liquid of the engine body. The electronic thermostat preferably adopts a resistance wire wax type electronic thermostat.
The intercooler electronic fan 1 and the radiator electronic fan 16 are connected to the output end of the thermal management ECU6, so that the rotation speed thereof is electronically controlled, and the rotation speed of the electronic fan is adjusted by adjusting control voltages with different duty ratios, thereby changing the heat dissipation amount thereof. The medium and light alcohol-diesel dual-fuel engine preferably adopts an electronic direct current electric fan, and the heavy alcohol-diesel dual-fuel engine preferably adopts an electronic electromagnetic clutch fan or an electronic silicone oil clutch fan.
The waste gas valve 11 is connected with the output end of the thermal management ECU6, the valve opening degree of the waste gas valve 11 is controlled electronically, and the valve opening degree of the waste gas valve 11 is adjusted by adjusting control voltages with different duty ratios, so that the waste gas quantity is adjusted to heat the alcohol fuel. The waste gas valve is preferably a high-temperature resistant and anti-corrosion electromagnetic gas valve.
In one embodiment of the invention, the operation process of the intelligent thermal management system for the alcohol-diesel dual-fuel engine shown in fig. 3 is as follows:
after the system is powered on, the thermal management ECU6 enters a working state, firstly, the system is self-checked, any problem of the system is found in the self-checking process, and the system enters a failure protection strategy immediately until the fault is removed or the system is powered on again.
And after the intelligent thermal management system is subjected to self-checking normally, the intelligent thermal management system starts to work. First, the seventh temperature sensor is used to detect the ambient temperature, and it is determined whether the alcohol-diesel dual-fuel engine 10 is in a low-temperature environment. If the alcohol-diesel dual-fuel engine 10 is in a low-temperature environment, the thermal management ECU6 adjusts the valve opening of the waste gas valve 11 according to the actual temperature to heat the alcohol fuel until the alcohol temperature is more than or equal to 20 ℃ and less than or equal to 40 ℃. If the alcohol-diesel dual fuel engine 10 is not in a low temperature environment, the dual fuel system operates normally. The thermal management ECU6 then determines the operating condition of the alcohol-diesel dual fuel engine 10 based on the signals from the speed and load sensors.
If the alcohol-diesel dual-fuel engine 10 is in a load rate of less than 25% and less than 0 at the moment, the engine 10 is in a low-load state. The intercooler electronic fan 1 speed is then adjusted until the intake charge temperature is 50 c or greater. The heat management ECU6 adjusts the rotation speed of the electronic water pump 13 and the rotation speed of the radiator electronic fan 16 until the temperature of the cooling liquid is more than 90 ℃ and less than or equal to 95 ℃. Eventually the alcohol-diesel dual fuel engine 10 is operating at optimum conditions.
If the alcohol-diesel dual-fuel engine 10 is in a load rate of 25% to 75% at this time, the engine 10 is in a medium load state. The intercooler electronic fan 1 speed is then adjusted until 40 < intake charge temperature < 50 ℃. The thermal management ECU6 then adjusts the speed of the electronic water pump 13 and the speed of the radiator electronic fan 16 until the temperature of the coolant is greater than or equal to 85 ℃ and less than or equal to 90 ℃. Eventually the alcohol-diesel dual fuel engine 10 is operating at optimum conditions.
If the alcohol-diesel dual-fuel engine 10 is in a load rate less than or equal to 100% in a range of 75%, the engine 10 is in a heavy load state. The intercooler electronic fan 1 speed is then adjusted until the intake charge temperature is 40 c or less. The thermal management ECU6 then adjusts the speed of the electronic water pump 13 and the speed of the radiator electronic fan 16 until the temperature of the coolant is 80 ℃ or lower and less than 85 ℃. Eventually the alcohol-diesel dual fuel engine 10 is operating at optimum conditions.
According to the intelligent thermal management system and method for the alcohol-diesel dual-fuel engine, the temperature of the cooling liquid, the temperature of the intake charge and the temperature of the alcohol fuel are always stabilized in the preset optimal target temperature range through closed-loop temperature control, the aim of accurately controlling the temperature of the engine is achieved, the energy consumption of the electronic water pump 13, the intercooler electronic fan 1 and the radiator electronic fan 16 is effectively reduced in the working process of the alcohol-diesel dual-fuel engine 10, the combustion efficiency of the alcohol fuel is improved, and therefore the oil consumption and the emission of the alcohol-diesel dual-fuel engine 10 are reduced.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (8)
1. The intelligent thermal management system of the alcohol-diesel dual-fuel engine is characterized by comprising a thermal management ECU (6), a rotating speed sensor, a load sensor, a pressure sensor and a temperature sensor;
the thermal management ECU (6) is used for controlling a cooling system according to the working condition and the environmental state of the engine, and the cooling system is used for cooling the engine;
the rotating speed sensor is connected with the input end of the thermal management ECU (6) and is used for detecting the rotating speed of the alcohol-diesel dual-fuel engine and transmitting data to the thermal management ECU (6);
the load sensor is connected with the input end of the thermal management ECU (6) and is used for detecting the load of the alcohol-diesel dual-fuel engine and transmitting data to the thermal management ECU (6);
the pressure sensor is connected with the input end of the thermal management ECU (6) and transmits pressure data to the thermal management ECU (6); the pressure sensors comprise a first pressure sensor and a second pressure sensor which are respectively arranged at an inlet and an outlet of the intercooler and are used for detecting the inlet pressure and the outlet pressure of the intercooler; the third pressure sensor is arranged on the alcohol rail (2) and used for detecting the pressure of the alcohol fuel, and the fourth pressure sensor is arranged on the outer edge of the engine body and used for detecting the atmospheric pressure;
the temperature sensor is connected with the input end of the thermal management ECU, transmits temperature data to the thermal management ECU and is used for detecting the temperature of each part of the alcohol-diesel dual-fuel engine; the second temperature sensor is arranged on a cooling pipeline behind the electronic water pump (13) and used for measuring the temperature of the cooling liquid;
the third temperature sensor is arranged on the exhaust pipe and used for measuring the exhaust temperature; the fourth temperature sensor and the fifth temperature sensor are respectively arranged at an inlet and an outlet of the intercooler and are used for measuring the inlet temperature and the outlet temperature of the intercooler; the sixth temperature sensor is arranged on the alcohol rail (2) and used for measuring the temperature of the alcohol fuel; the seventh temperature sensor is arranged at the outer edge of the engine body and used for measuring the ambient temperature; finally, an eighth temperature sensor, an intake charge temperature sensor (3), mounted on the intake manifold for sensing intake charge temperature; the cooling system comprises a radiator (15), an intercooler electronic fan (1), a radiator electronic fan (16), an electronic thermostat (12), an electronic water pump (13), a heat exchanger (4) and an exhaust gas valve (11), wherein the exhaust gas valve (11) is communicated with the heat exchanger (4); the electronic thermostat (12), the intercooler electronic fan (1), the radiator electronic fan (16), the electronic water pump (13) and the exhaust gas valve (11) are directly controlled by the heat management ECU (6);
the control method of the intelligent thermal management system of the alcohol-diesel dual-fuel engine comprises the following steps:
the method comprises the following steps: after the system is powered on, the thermal management ECU (6) enters a working state, firstly, the system is self-checked, any place of the system is found to have a problem in the self-checking process, and a failure protection strategy is immediately entered until the failure is relieved or the system is powered on again;
step two: after the intelligent thermal management system is normally self-checked, the intelligent thermal management system starts to work:
firstly, detecting the ambient temperature by using a seventh temperature sensor, and judging whether the alcohol-diesel dual-fuel engine (10) is in a low-temperature environment at the moment;
if the alcohol-diesel dual-fuel engine (10) is in a low-temperature environment, the heat management ECU (6) adjusts the valve opening of the exhaust valve (11) according to the actual temperature to heat the alcohol fuel until the alcohol temperature is more than or equal to 20 ℃ and less than or equal to 40 ℃;
if the alcohol-diesel dual-fuel engine (10) is not in a low-temperature environment, the dual-fuel system normally operates, and then the heat management ECU (6) judges the working condition state of the alcohol-diesel dual-fuel engine (10) according to the rotating speed and the signals transmitted by the load sensor;
if the alcohol-diesel dual-fuel engine (10) is not less than 0 and less than 25% of load rate at the moment, the engine (10) is in a small load state, then the rotating speed of an intercooler electronic fan (1) is adjusted until the intake charge temperature is greater than or equal to 50 ℃, and then a thermal management ECU (6) adjusts the rotating speed of an electronic water pump (13) and the rotating speed of a radiator electronic fan (16) until the temperature of the cooling liquid is greater than 90 ℃ and less than or equal to 95 ℃; finally the alcohol-diesel dual fuel engine (10) is running at optimum conditions;
if the alcohol-diesel dual-fuel engine (10) is in a load rate of more than or equal to 25% and less than or equal to 75% at the moment, the engine (10) is in a medium load state, then the rotating speed of an intercooler electronic fan (1) is adjusted until the temperature is higher than 40 ℃ and lower than 50 ℃, and then a thermal management ECU (6) adjusts the rotating speed of an electronic water pump (13) and the rotating speed of a radiator electronic fan (16) until the temperature of the coolant is higher than or equal to 85 ℃ and lower than or equal to 90 ℃; finally the alcohol-diesel dual fuel engine (10) is running at optimum conditions;
if the alcohol-diesel dual-fuel engine (10) is in a state of 75 percent more than the load rate less than or equal to 100 percent at the moment, the engine (10) is in a large load state, then the rotating speed of an intercooler electronic fan (1) is adjusted until the temperature of an intake charge is less than or equal to 40 ℃, and then a thermal management ECU (6) adjusts the rotating speed of an electronic water pump (13) and the rotating speed of a radiator electronic fan (16) until the temperature of the coolant is more than or equal to 80 ℃ and less than 85 ℃; the final alcohol-diesel dual fuel engine (10) operates at optimum conditions.
2. The alcohol-diesel dual fuel engine intelligent thermal management system according to claim 1, characterized in that the rotation speed of the radiator electronic fan (16) is controlled by the thermal management ECU (6) adjusting control voltages of different duty ratios.
3. The intelligent thermal management system for the alcohol-diesel dual-fuel engine according to claim 2, characterized in that the radiator electronic fan (16) and the intercooler electronic fan (1) are both electronic direct current electric fans, electronic electromagnetic clutch fans or electronic silicone oil clutch fans.
4. The intelligent thermal management system for the alcohol-diesel dual-fuel engine as claimed in claim 1, wherein the valve opening degree of the electronic thermostat (12) is controlled by the thermal management ECU (6) by adjusting control voltages with different duty ratios.
5. The intelligent thermal management system for the alcohol-diesel dual-fuel engine as claimed in claim 4, wherein the electronic thermostat (12) is a resistance wire wax type electronic thermostat.
6. The intelligent thermal management system for the alcohol-diesel dual-fuel engine is characterized in that the rotation speed of the electronic water pump (13) is controlled by the thermal management ECU (6) through adjusting control voltages with different duty ratios.
7. The intelligent thermal management system for the alcohol-diesel dual-fuel engine according to claim 6, wherein the electronic water pump (13) is an electronic direct-current electric water pump, an electronic electromagnetic clutch water pump or an electronic silicon oil clutch water pump.
8. The intelligent thermal management system for the alcohol-diesel dual-fuel engine as claimed in claim 1, wherein the valve opening degree of the exhaust gas valve (11) is controlled by the thermal management ECU (6) through adjusting control voltages with different duty ratios.
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| CN112377292A (en) * | 2020-12-01 | 2021-02-19 | 广西玉柴机器股份有限公司 | Control method and system capable of accurately managing heat of engine |
| WO2023097378A1 (en) * | 2021-11-30 | 2023-06-08 | Sousa Dario Donizete | Ethanol and biodiesel supply system for diesel cycle engine |
| CN114294088B (en) * | 2021-12-30 | 2022-10-28 | 潍柴动力股份有限公司 | Cooling system control method and device, cooling system and driving equipment |
| US11549451B1 (en) | 2022-04-26 | 2023-01-10 | Caterpillar Inc. | Intake bypass for liquid fuel engine |
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| CN114856794B (en) * | 2022-05-30 | 2023-08-18 | 淄柴机器有限公司 | Water temperature control method for marine diesel methanol dual-fuel engine |
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