CN109927534B - Thermal management system and control method for hybrid power heavy truck - Google Patents

Thermal management system and control method for hybrid power heavy truck Download PDF

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CN109927534B
CN109927534B CN201910211608.1A CN201910211608A CN109927534B CN 109927534 B CN109927534 B CN 109927534B CN 201910211608 A CN201910211608 A CN 201910211608A CN 109927534 B CN109927534 B CN 109927534B
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temperature
cooling
engine
electric control
oil
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CN109927534A (en
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刘海峰
杨鸿镔
尧命发
王浒
郑尊清
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Tianjin University
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Tianjin University
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Priority to PCT/CN2019/083266 priority patent/WO2020186589A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/02—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/02—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
    • B60H1/03—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant and from a source other than the propulsion plant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
    • 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
    • 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
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Air-Conditioning For Vehicles (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

The invention discloses a heat management system and a control method of a hybrid power heavy truck, wherein the heat management system respectively integrates components with different heat requirements into different cooling subsystems, and can be divided into a high-temperature-level cooling system comprising an engine water circulation cooling device and an engine oil circulation cooling device, a low-temperature-level cooling system comprising a power battery and a motor and an air conditioner cooling system with a double-drive air conditioner compressor. The heavy truck thermal management system provided by the invention provides a control method for vehicle warming, running and post-cooling, can realize the on-demand distribution of heat dissipation capacity of each component under each working condition, reasonably utilizes waste heat, and improves the energy consumption of accessories of the thermal management system, thereby improving the economy of the whole truck.

Description

Thermal management system and control method for hybrid power heavy truck
Technical Field
The invention belongs to the field of hybrid electric vehicle heat management, and particularly relates to a novel intelligent control method for accessories of a heat management system of a hybrid electric heavy-duty truck.
Background
The whole vehicle heat management system is an important auxiliary system for ensuring the normal and stable operation of all parts of the whole vehicle, and in order to ensure that the engine, the motor, the battery and the like for the vehicle are always in a good working state, the heat management must be reasonably controlled, so that the heat taken away by the cooling system is in an optimal range, the phenomena of unreliable operation caused by the degradation and burning loss of engine oil such as air charging coefficient reduction, abnormal combustion, knocking, pre-combustion and the like, which are caused by excessive cooling, are avoided, and the consequences of overlarge heat dissipation loss, increased effective power loss and increased mechanical loss caused by the increase of friction and abrasion of parts, which are caused by excessive cooling, are avoided. Compared with the traditional thermal management system, the hybrid power system has the advantages that the cooling requirements of components such as a motor and a power battery are increased, the cooling liquid temperature and the engine oil temperature of the components such as the engine are generally required to be about 90-120 ℃ due to different heating values of the components such as the electric equipment and the engine, the working temperatures of the motor and the power battery are generally recommended to be 10-40 ℃, and the cooling liquid temperature requirements are greatly different. The problems of the coupling of the fan, the water pump and the engine rotating speed of the traditional cooling system and the hysteresis of the thermostat limit the adaptability and the control precision of the engine thermal management system under the full working condition, and particularly the indexes such as the dynamic property, the economical efficiency, the reliability and the like of the nonstandard working condition point are greatly reduced.
The hybrid thermal management system in the patent "hybrid vehicle and its thermal management system and method (CN 108656940 a)" adopts a multi-circuit structure, but the disadvantage is that:
1. in the heating process of the vehicle in winter in the north, unnecessary heat loss caused by passive windward of the radiator is not considered in the high-voltage component cooling loop, and meanwhile, the power battery does not have a preheating scheme of a preheater.
2. The supercharged air charge intercooler is still arranged in a high-temperature-stage cooling liquid loop where the engine is located, and has limited effect on charge air cooling; the engine heat load components are not considered to be sufficiently refined, and the EGR cooler is not considered to be used;
3. the air conditioner compressor adopts an electric compressor, and has the characteristics of flexible and adjustable work and high working efficiency of the double-drive air conditioner compressor;
4. the cooling loops of the engine cylinder body and the engine cylinder cover are connected in series, so that the heat requirements corresponding to the cylinder body and the cylinder cover cannot be well met;
5. the flow of the engine oil cooling liquid cannot be flexibly controlled, namely the effective and controllable engine oil temperature cannot be realized, and the mechanical efficiency and the power consumption of an engine oil pump cannot be easily reduced;
a thermal management system in the patent "a hybrid car thermal management system (CN 207657762U)", wherein the disadvantage is that:
1. The heat loads of a supercharged air intake intercooler and an EGR cooler of the engine are not considered, the power battery adopts an air cooling mode, a preheating scheme is not adopted, and the important influence of flow distribution of the thermostat in a cooling loop is not highlighted.
2. The thermal management scheme of the air conditioning cooling circuit is not considered; the system has a complex structure and adopts a plurality of radiators and a plurality of groups of radiating fans.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a thermal management system and a control method for a hybrid power heavy truck, which integrate components with different heat requirements into cooling subsystems with different temperatures, can meet the high requirements of each component on the heat environment, ensure the functions and performances of each component, improve the service life and efficiency of each component, and ensure that the power system of the novel hybrid power heavy truck simultaneously meets the heat dissipation requirements of an engine, a battery and a motor and the requirements of the design of minimizing the power consumption of accessories.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the heat management system of the hybrid power heavy truck comprises a high-temperature-level cooling system, a low-temperature-level cooling system and an air-conditioning cooling system;
the high-temperature-stage cooling system comprises an engine water circulation cooling device and an engine oil circulation cooling device, the engine water circulation cooling device is divided into a first electric control three-way ball valve, two inlets of the first electric control three-way ball valve are respectively connected with a first cooling circulation pipeline outlet in an engine cylinder cover and a second cooling circulation pipeline outlet in an engine cylinder body through a first cooling liquid pipeline provided with a temperature sensor A and a second cooling liquid pipeline provided with a temperature sensor B, and the outlet of the first electric control three-way ball valve is connected with an engine cooling liquid main runner, an EGR cooling loop formed by connecting a first electromagnetic valve and an EGR cooler in series and an inlet formed by connecting a second electromagnetic valve and a warm air heat exchanger in series after the warm air loop is converged; an inlet a of the second electric control three-way ball valve is connected with an outlet after the engine cooling liquid main flow passage, the EGR cooling loop and the warm air loop are converged;
The outlet b of the second electric control three-way ball valve is sequentially connected with the first PTC heater and the high-temperature-stage electric control water pump through a small circulation branch of engine cooling liquid and then is divided into two paths, one path is connected with a first cooling circulation pipeline inlet in an engine cylinder cover, and the other path is connected with a second cooling circulation pipeline inlet in the engine cylinder cover;
the outlet of the second electric control three-way ball valve is sequentially connected with the high-temperature-level radiator and the high-temperature-level electric control water pump through an engine cooling liquid large circulation branch, and then is divided into two paths, one path is connected with a first cooling circulation pipeline inlet in an engine cylinder cover, the other path is connected with a second cooling circulation pipeline inlet in the engine cylinder body, and the high-temperature-level cooling fan is arranged close to the high-temperature-level radiator;
the engine oil circulating cooling device comprises an oil way three-way valve, wherein an inlet a of the oil way three-way valve is connected with an oil way outlet of an engine cylinder body through an oil outlet pipeline provided with a temperature sensor E, an outlet c of the oil way three-way valve is sequentially connected with an engine oil radiator, an oil pan, an oil pump, an oil filter and an oil way inlet of the engine cylinder body through an oil way large circulation pipeline, an outlet b of the oil way three-way valve is communicated with the engine oil radiator and the oil way large circulation pipeline between the engine oil radiator and the oil pan through an oil way small circulation pipeline, and the engine oil radiator is arranged outside the high-temperature radiator;
The low-temperature-stage cooling system comprises a third electric control three-way ball valve, a C outlet of the third electric control three-way ball valve is sequentially connected with a low-temperature-stage electric control water pump, a water cooling circulation pipeline in a power battery, a temperature sensor C, a third electromagnetic valve, a water cooling circulation pipeline of a motor, a temperature sensor D, a second PTC heater, a supercharging air charge intercooler, a low-temperature-stage radiator and an a inlet of the third electric control three-way ball valve through a first circulation pipeline, an electric control shutter is arranged on the outer side of the radiator, a low-temperature-stage cooling fan is arranged on the inner side of the radiator, one end of a low-temperature-stage small circulation branch is communicated with a first circulation pipeline between the air charge intercooler and the second PTC heater, the other end of the low-temperature-stage cooling liquid main flow pipeline is communicated with a first circulation pipeline between the temperature sensor C and the third electromagnetic valve, the other end of the low-temperature-stage cooling liquid main flow pipeline is communicated with the first circulation pipeline between the motor and the second PTC heater, and the working modes of the low-temperature-stage electric control water pump and the low-temperature-stage cooling fan are divided into a closed state, a low-speed gear and a high-speed gear;
the air conditioner cooling system comprises an outlet of an air conditioner condenser, an air conditioner throttle valve, an air conditioner evaporator, a double-drive air conditioner compressor and an inlet of the air conditioner condenser which are sequentially connected through a second circulation pipeline, the air conditioner condenser is arranged on the outer side of the high-temperature-level radiator, a driven belt pulley assembly with an electromagnetic clutch is arranged on an external input shaft of the double-drive air conditioner compressor, and a driven belt pulley in the driven belt pulley assembly is connected with a belt pulley on a crankshaft of an engine through a belt; when the controller of the air conditioner compressor receives an air conditioner starting signal and judges that the engine is working, the controller of the air conditioner compressor closes the electromagnetic clutch; when the controller of the air conditioner compressor receives an air conditioner closing signal, the electromagnetic clutch is disconnected; the rotating shaft of the built-in driving motor is connected with the rotating shaft of the double-driving air conditioner compressor, a control line of the built-in driving motor is connected with a controller of the air conditioner compressor, when the controller of the air conditioner compressor receives an air conditioner starting signal and the engine is stopped, the electromagnetic clutch is in a disconnected state, and the controller of the air conditioner compressor outputs an operation signal to the built-in driving motor through the control line to control the built-in driving motor to rotate, so that the air conditioner compressor is driven to work; when the controller of the air conditioner compressor receives an air conditioner closing signal, the controller of the air conditioner compressor outputs a stall signal to the built-in driving motor to control the built-in driving motor to stall; the power line of the built-in driving motor is connected with a high-voltage circuit where the power battery is located, and power is supplied through the high-voltage circuit where the power battery is located; the control method of the thermal management system of the hybrid power heavy truck comprises cooling system control in the warm-up process of cold start of the vehicle, the normal operation process of the vehicle and the shutdown process of the vehicle, wherein the cooling system control is divided into high-temperature-level cooling system control, low-temperature-level cooling system control and air-conditioning cooling system control, and the high-temperature-level cooling system control comprises high-temperature-level cooling device water circulation cooling control and high-temperature-level cooling device oil circulation cooling control:
Wherein: cooling system control during warm-up of vehicle cold start:
the water circulation cooling control process of the high-temperature-stage cooling device comprises the following steps:
step 1a, a high-temperature-level electric control water pump runs in a low-speed mode for avoiding local overheating of an engine, cooling liquid flowing out of an outlet of a first cooling circulation pipeline in an engine cylinder cover and cooling liquid flowing out of a second cooling circulation pipeline in the engine cylinder body sequentially pass through a first electric control three-way ball valve, an engine cooling liquid main runner, an inlet a of a second electric control three-way ball valve, an outlet B of the second electric control three-way ball valve, a first PTC heater and a high-temperature-level electric control water pump and then respectively return to the inlet of the first cooling circulation pipeline in the engine cylinder cover and the inlet of the second cooling circulation pipeline in the engine cylinder body, in the process, according to temperature signals acquired by a temperature sensor A and a temperature sensor B, the ball valve rotation angle of the first electric control three-way ball valve is regulated, flow distribution of the first cooling circulation pipeline and the second cooling circulation management is controlled, and heat exchange quantity of the cooling liquid in the first cooling circulation pipeline and the engine cylinder cover and heat exchange quantity of the cooling liquid in the second cooling circulation pipeline and the engine cylinder body are controlled, and the temperature of the outlet cooling liquid of the second cooling circulation pipeline is 5 ℃ higher than the temperature of the cooling liquid in the first cooling circulation pipeline;
Step 1b, when the temperature of the outlet cooling liquid of the second cooling circulation pipeline and the temperature of the outlet cooling liquid of the first cooling circulation pipeline are detected to be more than 85 ℃, judging that the engine is warmed up, gradually closing the outlet b of the second electric control three-way ball valve in the step 1a, closing the first PTC heater, gradually opening the outlet c of the second electric control three-way ball valve to be fully opened, and enabling the inlet a cooling liquid flowing into the second electric control three-way ball valve in the step 1a to flow through the high-temperature radiator and the high-temperature electric control water pump through the outlet c of the second electric control three-way ball valve and then return to the inlet of the first cooling circulation pipeline in the engine cylinder cover and the inlet of the second cooling circulation pipeline in the engine cylinder body respectively;
the working process of the high-temperature-level cooling oil circulation device is as follows:
step 2a, the engine oil sucked by the engine oil pump from the oil pan passes through an engine oil filter and each lubricating part of the engine and then flows into an inlet a of an oil way three-way valve and an outlet b of the oil way three-way valve which is fully opened, and the engine oil returns to the oil pan again and flows through the inlet of the engine oil pump to enter the next circulation, so that each part of the engine is lubricated;
step 2b, when the temperature of the engine oil detected by the temperature sensor E reaches more than 100 ℃, judging that the engine oil is completely preheated, and entering step 5 a;
The working process of the low-temperature-stage cooling device is as follows:
step 3a, when the temperature sensor C detects that the temperature of the cooling liquid in the water cooling circulation pipeline in the battery pack of the power battery is lower than 10 ℃, the electric control shutter is closed, the low-temperature-level cooling fan is closed, the low-temperature-level electric control water pump works in a minimum power state, the circulation of the low-temperature-level cooling liquid is maintained to have a certain flow rate, the inlet a of the third electric control three-way ball valve is fully opened, the inlet b of the third electric control three-way ball valve is closed, and at first, if the motor does not work in the running process of the vehicle, the third electromagnetic valve is closed, and the cooling liquid in the water cooling circulation pipeline in the power battery flows into the second PTC heater from the main flow channel of the low-temperature-level cooling liquid; when the motor works in the running process of the vehicle, the third electromagnetic valve is opened, and the cooling liquid in the water cooling circulation pipeline in the power battery flows out of the low-temperature-level cooling liquid main flow passage and the flow passage formed by connecting the third electromagnetic valve and the water cooling circulation passage of the motor in series and then enters the second PTC heater;
then, the cooling liquid flowing out of the second PTC heater flows through a supercharging air inlet intercooler for heat exchange, and the cooling liquid after heat exchange flows back to the low-temperature-level electric control water pump through the low-temperature-level radiator and the third electric control three-way ball valve in sequence and flows into an inlet of a water cooling circulation pipeline of the power battery again for circularly heating the power battery;
Step 3b, when the temperature of the power battery is detected to be higher than 15 ℃, the heating function of the second PTC heater is closed, the low-temperature-level electric control water pump is closed, the preheating is completed, and the operation mode under the normal working condition is entered;
cooling system control when the vehicle is running under normal working conditions:
the water circulation cooling control process of the high-temperature-stage cooling device comprises the following steps:
step 4a, the inlet a and the outlet c of the second electric control three-way ball valve are in a fully-opened state, and the outlet b of the second electric control three-way ball valve is in a fully-closed state; firstly, cooling liquid flowing out of a first cooling circulation pipeline in an engine cylinder cover and cooling liquid flowing out of a second cooling circulation pipeline in an engine cylinder body pass through a first electric control three-way ball valve, then one part of the cooling liquid passes through an engine cooling liquid main flow passage, and the other part of the cooling liquid passes through an EGR cooler through a first electromagnetic valve which is opened to cool recirculated exhaust gas; and then cooling liquid is converged into an inlet a of a second electric control three-way ball valve, cooling liquid flowing out of an outlet c of the second electric control three-way ball valve fully exchanges heat with the environment in a high-temperature-stage radiator and then flows into a high-temperature-stage electric control water pump, an inlet of a first cooling circulation pipeline and an inlet of a second cooling circulation pipeline in an engine cylinder body in sequence, and in the process, the cooling liquid flow of outlets of the engine cylinder cover and the engine cylinder body is distributed by adjusting the rotation angle of the first electric control three-way ball valve, so that the temperature of the cooling liquid flowing out of the outlet of the first cooling circulation pipeline is lower than that of the cooling liquid flowing out of the outlet of the second cooling circulation pipeline by 5 ℃;
The working process of the high-temperature-level cooling oil circulation device is as follows:
step 5a, the oil pump supplies engine oil to an oil duct inlet of an engine cylinder body with calibrated oil pressure and oil quantity according to the state of the engine; the specific process is as follows: the engine oil is sucked out from the oil pan, sequentially passes through the engine oil pump, the engine oil filter and each lubricating part of the engine and flows into an inlet a of the oil way three-way valve, part of the engine oil flows out from the oil way three-way valve through an outlet b and then enters the oil pan, and the other part of the engine oil flows out from an outlet c of the oil way three-way valve, passes through the engine oil radiator and then sequentially enters the oil pan and the engine oil pump and circulates to lubricate each part of the engine, oil temperature control is realized by controlling the oil quantity of the outlet b and the outlet c of the oil way three-way valve, when the oil temperature is lower than 110 ℃, the opening of the outlet c is reduced, and the opening of the outlet b is increased, so that the oil temperature is increased; when the oil temperature is higher than 130 ℃, increasing the opening of the outlet c and reducing the opening of the outlet b;
the working process of the low-temperature-stage cooling device is as follows:
step 6a, when the power battery discharges and the motor works, the third electromagnetic valve is opened; when the ambient temperature is lower than 0 ℃ and the temperature of the cooling liquid flowing through a water cooling circulation pipeline in the power battery is lower than 20 ℃, closing the electric control shutter, and closing the low-temperature-stage electric control water pump; when the ambient temperature is not lower than 0 ℃, or when the temperature sensor C collects the temperature of the cooling liquid in the power battery water cooling circulation pipeline to be not lower than 20 ℃, or when the temperature sensor D collects the temperature of the cooling liquid in the motor water cooling circulation pipeline to be higher than 25 ℃, the electric control shutter is opened, the low-temperature-level electric control water pump is in a low-speed state, the low-temperature-level cooling fan is closed, and at the moment, the opening of the inlet a and the opening of the inlet b of the third electric control three-way ball valve are gradually increased by adjusting the opening of the inlet a and the opening of the inlet b of the third electric control three-way ball valve when the temperature of the cooling liquid in the power battery water cooling circulation pipeline rises; when the temperature of the cooling liquid at the outlet of the water cooling circulation pipeline of the power battery is higher than 30 ℃, the inlet a of the third electric control three-way ball valve is fully opened, and the low-temperature-stage cooling fan is started to a low speed gear; when the temperature of the cooling liquid in the water cooling circulation pipeline of the power battery is higher than 40 ℃ or the temperature of the cooling liquid in the water cooling circulation pipeline of the motor exceeds 50 ℃, the low-temperature-level cooling fan operates at a high speed gear, and the low-temperature-level electric control water pump operates at a high speed to enable the cooling liquid to dissipate heat rapidly;
Cooling system control during vehicle shutdown:
and (3) controlling a high-temperature-level water circulation device:
step 7a, in the high-temperature-stage cooling loop, keeping the high-temperature-stage electric control water pump to work for 2 minutes at the rotating speed with the minimum power consumption after the engine is stopped, and closing the high-temperature-stage cooling fan;
control of the cryogenic stage cooling device:
step 8a, the low-temperature-level cooling loop is closed after the electric control shutter, the low-temperature-level cooling fan and the low-temperature-level electric control water pump are powered down along with the whole vehicle due to smaller heat load;
and (3) controlling an air conditioner cooling system under the conditions of engine warm-up and normal working conditions:
the control process when the passenger cabin has refrigeration requirement:
step 9a, in the refrigeration process, the second electromagnetic valve is closed, the air blower is started, the power battery supplies electric energy to the double-drive air conditioner compressor and drives the double-drive air conditioner compressor to operate, the temperature and the pressure of the refrigerant in the air conditioner cooling system are increased after passing through the double-drive air conditioner compressor, heat exchange is carried out between the refrigerant and the environment at the air conditioner condenser, the temperature is reduced, the refrigerant flows through the air conditioner throttle valve to reduce the pressure, finally, the air blown into the passenger cabin by the air blower is cooled in the air conditioner evaporator, and the air flows back to the inlet of the double-drive air conditioner compressor to complete the refrigeration cycle;
the control process when the passenger cabin has heating requirement:
Step 10a, when the passenger has heating requirements, if the engine does not work, the second electromagnetic valve is opened, the inlet a of the second electric control three-way ball valve is fully opened, the outlet b of the second electric control three-way ball valve is fully opened, the outlet c of the second electric control three-way ball valve is fully closed, the high-temperature-stage electric control water pump works in a minimum power consumption state, at the moment, cooling liquid of the high-temperature-stage cooling loop flows out from a first cooling circulation pipeline outlet in the engine cylinder cover and a second cooling circulation pipeline outlet in the engine cylinder body and is converged into the first electric control three-way ball valve after passing through the high-temperature-stage electric control water pump, and the cooling liquid flows through an engine cooling liquid main flow channel and a warm air heat exchanger on a warm air loop respectively; the blower is started, the heat of the cooling liquid in the warm air heat exchanger is transferred to the air entering the passenger cabin, and then the cooled cooling liquid and the cooling liquid in the engine cooling liquid main flow passage are converged and then sequentially flow through the second electric control three-way ball valve, the first PTC heater and the high-temperature-level electric control water pump to complete heating circulation;
when the passenger has heating requirements, the engine works and is in a warmth state, the step 1a is started, the second electromagnetic valve is started, the blower is started, heat in the cooling liquid flowing through the second electromagnetic valve and the warm air heat exchanger is transferred to air entering the passenger cabin, and the cooling liquid is converged with the cooling liquid at the outlet of the main flow passage of the engine cooling liquid and then continuously circulated; if the engine works and is in a normal working state, the step 4a is entered, the second electromagnetic valve is opened, the blower is opened, heat in the cooling liquid flowing through the second electromagnetic valve and the warm air heat exchanger is transferred to air entering the passenger cabin, and after the cooling liquid of the engine cooling liquid main flow passage and the outlet of the EGR cooler are converged, circulation is continued, and warm air supply is completed.
Compared with the prior art, the invention has the following advantages:
firstly, the invention distributes according to the different heat demands of each part of the whole vehicle heat management, and the electronic control three-way ball valve is adopted in the high-temperature-level cooling system to realize the accurate temperature control of the cooling liquid of the engine cylinder body and the cylinder cover under each working condition. The electric control three-way ball valve is adopted in the high-temperature-level cooling system to replace the traditional paraffin thermostat, so that accurate control of accurate flow is realized, fuel consumption is reduced, a solution is provided for further reducing accessory power consumption and improving engine economy, and a foundation is laid for realizing future intelligent control strategies.
Secondly, the invention separates the high-temperature cooling circuit from the low-temperature cooling circuit, so that the low-temperature level cooling system works at proper temperatures of the motor and the battery, and the condition that the battery cannot work normally due to supercooling or overheating is avoided. The supercharged air charge intercooler is arranged in the low-temperature-stage cooling loop to realize a better cooling effect of supercharged air charge, the defect of insufficient water cooling capacity of a high-temperature-stage cooling system of an engine part is avoided, the temperature of supercharged air charge is further reduced, the air charge and air charge efficiency are improved, and therefore the thermal efficiency of the engine is improved. The electric control shutter is additionally arranged outside the radiator in the low-temperature-level cooling system, so that the heat exchange process of the low-temperature-level cooling system can be controlled more flexibly, the cooling of the supercharging air-intake intercooler and the preheating of the power battery can be realized synchronously, the internal heat is effectively utilized, and the heat-saving effect is more obvious in the heat preservation of the winter thermal management system;
Thirdly, the invention fully utilizes the contribution of the heat of the supercharged air intake intercooler to the preheating process of the low-temperature-level cooling system, and simultaneously preheats through the PTC heater when the temperature is low, prolongs the service life of the engine and the battery, optimizes the working heat environment of each part, and realizes the effects of shortening the warming time and reducing the energy consumption.
Fourth, the invention adopts the high-low temperature double-cooling loop system, the structure is simpler, the used heat exchangers and sensors are fewer, the cost is low, the invention is easy to reform on the basis of the prior art, and the maintenance is convenient.
Fifth, the refrigerating part of the air conditioner cooling system adopts the double-drive air conditioner compressor, and when the engine of the hybrid power heavy truck is stopped, passengers can provide cold air without starting the engine when the cooling demand is caused by sultry of weather, so that the unnecessary energy waste caused by the engine working under idle speed is avoided. When the engine works, the electric drive can be changed into a mechanical drive mode, so that the problem of low energy transmission efficiency caused by the electric drive is avoided.
Drawings
In order to more clearly illustrate the technical solutions implemented in the present application or in the prior art, the following brief description of the drawings used in this invention is provided with further details by way of example, in which
FIG. 1 is a schematic diagram of a thermal management system for a hybrid heavy truck according to the present invention;
FIG. 2 is a schematic diagram of a high temperature stage cooling system in the system shown in FIG. 1;
FIG. 3 is a schematic diagram of a cryogenic cooling system in the system shown in FIG. 1;
FIG. 4 is a schematic diagram of an air conditioning cooling system in the system shown in FIG. 1;
reference numeral 1: 1-an engine cylinder cover; 2-an engine block; 3-an oil pump; 4-a first electric control three-way ball valve; 5-a first solenoid valve; 6-a second solenoid valve; 7-an EGR cooler; 8-a blower; 9-a warm air heat exchanger; 10-an air conditioning evaporator; 11-a second electric control three-way ball valve; 12-a first PTC heater; 13-an oil way three-way valve; 14-high-temperature-level electric control water pump; 15-a high-temperature-stage cooling fan; 16-high temperature grade heat sink; 17-an air conditioning condenser; 18-double driving air conditioner compressor; 19-air conditioning throttle valve; 20-a power cell; 21-a low-temperature-level electric control water pump; 22-a third electric control three-way ball valve; 23-a charge air intercooler; 24-low-temperature-level cooling fan; 25-low temperature stage heat sink; 26-a second PTC heater; 27-a third solenoid valve; 28-an electric motor; 29-engine coolant primary flow passage; 30-a low-temperature-stage cooling liquid main channel; 31-an engine oil radiator; 32-an oil filter; 33-an electronically controlled shutter; 34-oil pan.
Detailed Description
In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in further detail with reference to specific embodiments.
The heat management system of the hybrid power heavy truck comprises a high-temperature-level cooling system, a low-temperature-level cooling system and an air-conditioning cooling system;
the high-temperature-stage cooling system comprises an engine water circulation cooling device and an engine oil circulation cooling device, the engine water circulation cooling device is divided into a first electric control three-way ball valve 4, two inlets of the first electric control three-way ball valve 4 are respectively connected with a first cooling circulation pipeline outlet in an engine cylinder cover 1 and a second cooling circulation pipeline outlet in an engine cylinder body 2 through a first cooling liquid pipeline provided with a temperature sensor A and a second cooling liquid pipeline provided with a temperature sensor B, and the outlet of the first electric control three-way ball valve 4 is connected with an engine cooling liquid main runner 29, an EGR cooling loop formed by connecting a first electromagnetic valve 5 and an EGR cooler 7 in series and an inlet formed by connecting a second electromagnetic valve 6 and a warm air heat exchanger 9 in series after converging; a blower 8 is provided near the warm air heat exchanger 9. The inlet a of the second electric control three-way ball valve 11 is connected with an outlet after the engine cooling liquid main runner 29, the EGR cooling loop and the warm air loop are converged;
The outlet b of the second electric control three-way ball valve 11 is sequentially connected with the first PTC heater 12 and the high-temperature-stage electric control water pump 14 through a small circulation branch of engine cooling liquid and then is divided into two paths, one path is connected with a first cooling circulation pipeline inlet in the engine cylinder cover 1, and the other path is connected with a second cooling circulation pipeline inlet in the engine cylinder body 2. The engine coolant small circulation is led to flow from the inlet a of the second electric control three-way ball valve 11 to the first PTC heater 12 through the engine coolant small circulation branch, and flows to the cooling circulation of the engine cylinder cover 1 and the engine cylinder body 2 after passing through the high-temperature-stage electric control water pump 14.
The outlet of the second electric control three-way ball valve 11 is sequentially connected with the high-temperature-level radiator 16 and the high-temperature-level electric control water pump 14 through an engine cooling liquid large circulation branch, and then is divided into two paths, one path is connected with a first cooling circulation pipeline inlet in the engine cylinder cover 1, and the other path is connected with a second cooling circulation pipeline inlet in the engine cylinder body 2. The high-temperature-stage heat radiation fan 15 is disposed close to the high-temperature-stage heat radiator 16. The flowing direction of the cooling liquid is that the cooling liquid flows from the inlet of the second electric control three-way ball valve 11 to the high-temperature-stage radiator 16, and flows to the cooling circulation of the engine cylinder cover 1 and the engine cylinder body 2 after passing through the high-temperature-stage electric control water pump 14.
The engine oil circulating and cooling device comprises an oil way three-way valve 13, wherein an inlet a of the oil way three-way valve 13 is connected with an oil way outlet of the engine cylinder body 2 through an oil outlet pipeline provided with a temperature sensor E. The outlet of the oil way three-way valve 13 is sequentially connected with an oil radiator 31, an oil pan 34, an oil pump 3, an oil filter 32 and an oil way inlet of the engine cylinder body 2 through an oil way large circulation pipeline. The outlet b of the oil way three-way valve 13 is communicated with an oil way large circulation pipeline between the engine oil radiator 31 and the oil pan 34 through an oil way small circulation pipeline. The engine oil radiator 31 is disposed outside the high-temperature-stage radiator 16. The preferred oil pump 3 is a variable displacement electronically controlled oil pump.
The low-temperature-stage cooling system comprises a third electric control three-way ball valve 22, wherein a C outlet of the third electric control three-way ball valve 22 is sequentially connected with a low-temperature-stage electric control water pump 21, a water cooling circulation pipeline in a power battery 20, a temperature sensor C, a third electromagnetic valve 27, a water cooling circulation pipeline of a motor 28, a temperature sensor D, a second PTC heater 26, a supercharging air inlet intercooler 23, a low-temperature-stage radiator 25 and an inlet a of the third electric control three-way ball valve 22 through a first circulation pipeline. The electric control shutter 33 is located outside the radiator, and controls whether the air of the environment can flow through the low-temperature-stage radiator 25 or not by opening and closing the electric control shutter 33, and the low-temperature-stage radiator fan 24 is located inside the radiator. One end of the low-temperature-stage small circulation branch is communicated with a first circulation pipeline between the intake intercooler 23 and the second PTC heater 26 and the other end is communicated with the b inlet of the third electronically controlled three-way ball valve 22. The inlet of the low-temperature-stage coolant main flow passage 30 communicates with a first circulation line between the temperature sensor C and the third solenoid valve 27 and the other end communicates with a first circulation line between the motor 28 and the second PTC heater 26. The coolant flowing out of the motor water-cooling circulation line and the low-temperature-stage coolant main flow passage 30 flows parallel to the inlet of the second PTC heater 26. The working modes of the low-temperature-level electric control water pump 21 and the low-temperature-level cooling fan 24 are divided into a closed state, a low-speed gear and a high-speed gear.
The low-speed gear speed range of the low-temperature-stage electric control water pump 21 is generally set between 800 rpm and 1200rpm and the high-speed gear speed range is generally set between 1800 rpm and 2000 rpm.
The low-speed range of the low-temperature stage cooling fan 24 is generally set between 1000-1500rpm and the high-speed range is generally set between 2000-2500 rpm.
The air conditioning cooling system includes an outlet of an air conditioning condenser 17, an air conditioning throttle valve 19, an air conditioning evaporator 10, a dual driving air conditioning compressor 18, and an inlet of the air conditioning condenser 17, which are sequentially connected through a second circulation line. The air conditioning condenser 17 is disposed outside the high-temperature-stage radiator 16. The external input shaft of the double-drive air conditioner compressor 18 is provided with a driven belt pulley assembly with an electromagnetic clutch, and a driven belt pulley in the driven belt pulley assembly is connected with a belt pulley on a crankshaft of the engine through a belt. When the controller of the air conditioner compressor receives an air conditioner starting signal and judges that the engine is working, the controller of the air conditioner compressor closes the electromagnetic clutch; the electromagnetic clutch is disconnected when the controller of the air conditioner compressor receives an air conditioner closing signal. The rotating shaft of the built-in driving motor is connected with the rotating shaft of the double-driving air conditioner compressor 18, a control line of the built-in driving motor is connected with a controller of the air conditioner compressor, when the controller of the air conditioner compressor receives an air conditioner starting signal and the engine is stopped, the electromagnetic clutch is in a disconnected state, and the controller of the air conditioner compressor outputs an operation signal to the built-in driving motor through the control line to control the built-in driving motor to rotate, so that the air conditioner compressor is driven to work; when the controller of the air conditioner compressor receives an air conditioner closing signal, the controller of the air conditioner compressor outputs a stall signal to the built-in driving motor to control the built-in driving motor to stall; the power line of the built-in driving motor is connected with the high-voltage circuit where the power battery 20 is located, and power is supplied through the high-voltage circuit where the power battery 20 is located. An inlet of the air conditioner condenser 17 is connected with an outlet of the dual-drive air conditioner compressor 18, an outlet of the air conditioner condenser 17 is connected with an inlet of the air conditioner throttle valve 19, and the air conditioner condenser 17 is arranged on the outer side of the high-temperature-stage radiator 16, so that ambient air sequentially flows through the air conditioner condenser 17, the engine oil radiator 31 and the high-temperature-stage radiator 16; an inlet of the air conditioning evaporator 10 is connected to an outlet of the air conditioning throttle valve 19, and an outlet of the air conditioning evaporator 10 is connected to an inlet of the dual drive air conditioning compressor 18. The power source of the double-drive air conditioner compressor is divided into two parts. And when the controller of the air conditioner compressor receives an air conditioner request signal and the engine is running, the electromagnetic clutch is closed, and the torque of the engine crankshaft can be transferred to a mechanical driving mode on a power input shaft of the air conditioner compressor. The power of the other working mode is derived from the electric energy of the power battery 20, and the power battery 20 supplies power to the built-in driving motor, so that the air conditioner compressor is driven to work in an electric driving mode.
The invention relates to a control method of a thermal management system of a hybrid power heavy truck, which comprises cooling system control in the warm-up process of cold start of the vehicle, the normal operation process of the vehicle and the shutdown process of the vehicle, wherein the cooling system control comprises high-temperature-level cooling system control, low-temperature-level cooling system control and air-conditioning cooling system control, and the high-temperature-level cooling system control comprises water circulation cooling control of a high-temperature-level cooling device and oil circulation cooling control of the high-temperature-level cooling device:
wherein: cooling system control during warm-up of vehicle cold start:
the water circulation cooling control process of the high-temperature-stage cooling device comprises the following steps:
in step 1a, the high-temperature-stage electric control water pump 14 operates in a low-rotation speed mode (rotation speed is determined according to different engine conditions) for avoiding local overheating of the engine, and the cooling liquid flowing out of the outlet of the first cooling circulation pipeline in the engine cylinder cover 1 and the cooling liquid flowing out of the second cooling circulation pipeline in the engine cylinder body 2 sequentially pass through the first electric control three-way ball valve 4, the engine cooling liquid main flow passage 29, the inlet a of the second electric control three-way ball valve 11, the outlet b of the second electric control three-way ball valve 11 which is fully opened, the first PTC heater 12 and the high-temperature-stage electric control water pump 14 and then return to the inlet of the first cooling circulation pipeline in the engine cylinder cover 1 and the inlet of the second cooling circulation pipeline in the engine cylinder body 2 respectively. In the process, according to temperature signals acquired by the temperature sensor A and the temperature sensor B, the ball valve rotation angle of the first electric control three-way ball valve 4 is regulated, and the flow distribution of the first cooling circulation pipeline and the second cooling circulation management is controlled, so that the heat exchange amount of the cooling liquid in the first cooling circulation pipeline and the engine cylinder cover 1 and the heat exchange amount of the cooling liquid in the second cooling circulation pipeline and the engine cylinder body 2 are controlled, the temperature of the cooling liquid at the outlet of the second cooling circulation pipeline is higher than that of the cooling liquid at the outlet of the first cooling circulation pipeline by 5 ℃, the improvement of air inlet efficiency and air inflow in the warming-up process is realized, and the reduction of heat transfer loss in the combustion process is realized.
The engine temperature is low in the cold start process, the NOx emission concentration is low, in order to prevent the EGR from deteriorating and burning, and in order to accelerate the warm-up process, EGR cooling is not adopted, the first electromagnetic valve 5 and the second electromagnetic valve 6 are in a closed state initially, and the blower 8 is closed due to the closing of the second electromagnetic valve 6; the outlet c of the second electric control three-way ball valve 11 is completely closed, and the cooling liquid completely passes through the first PTC heater 12 and reenters the inlet of the high-temperature-stage electric control water pump 14 to circularly heat the engine; in order to accelerate the warming-up process, the first PTC heater 12 heats the coolant with a given power, and reduces fuel consumption and pollutant emissions under the warming-up condition, so that the total warming-up time is shortened by accelerating the warming-up process, and the purposes of reducing fuel consumption and improving thermal efficiency are achieved. To further save the energy consumption during the warm-up process, the high-temperature-stage heat radiation fan 15 is in an off state.
And step 1b, when the temperature of the outlet cooling liquid of the second cooling circulation pipeline and the temperature of the outlet cooling liquid of the first cooling circulation pipeline are detected to be more than 85 ℃, judging that the engine is warmed up, in order to ensure the working efficiency and the heat radiation effect of the heat radiation fan and the water pump, gradually closing the outlet b of the second electric control three-way ball valve 11 in step 1a, closing the PTC heater 12, gradually opening the outlet c of the second electric control three-way ball valve 11 to be fully opened, so that the inlet a cooling liquid flowing into the second electric control three-way ball valve 11 in step 1a flows through the outlet c of the second electric control three-way ball valve 11 to be respectively returned to the inlet of the first cooling circulation pipeline in the engine cylinder cover 1 and the inlet of the second cooling circulation pipeline in the engine cylinder body 2 after all flowing through the high-temperature radiator 16 and the high-temperature electric control water pump 14.
The working process of the high-temperature-level cooling oil circulation device is as follows:
and 2a, adopting the variable displacement electric control oil pump 3, the oil pressure of the constant displacement pump can be realized with the minimum displacement. The engine oil sucked by the variable displacement electric control engine oil pump 3 from the oil pan 34 flows into an inlet a of the oil way three-way valve 13 and an outlet b of the oil way three-way valve 13 after passing through the engine oil filter 32 and various lubricating components of the engine, and the engine oil returns to the oil pan 34 again and flows into the inlet of the engine oil pump 3 to enter the next circulation so as to lubricate various components of the engine;
and step 2b, when the temperature of the engine oil detected by the temperature sensor E reaches more than 100 ℃, judging that the engine oil is completely preheated, and entering step 5 a.
The working process of the low-temperature-stage cooling device is as follows:
in step 3a, when the temperature sensor C detects that the temperature of the cooling liquid in the water cooling circulation pipeline in the battery pack of the power battery 20 is lower than 10 ℃, the electric control shutter 33 is closed, the low-temperature-level cooling fan 24 is closed, the convection heat exchange between the ambient air and the low-temperature-level radiator 25 is prohibited, and the heat loss and the energy consumption of temperature saving are reduced. The low-temperature-stage electric control water pump 21 works in a minimum power state, maintains a certain flow rate of low-temperature-stage cooling liquid circulation, and the inlet a of the third electric control three-way ball valve 22 is in a full-open state, and the inlet b of the third electric control three-way ball valve 22 is in a closed state. At this time, first, if the motor 28 is not operated during the running of the vehicle, the third solenoid valve 27 is closed, and the coolant in the water-cooling circulation line of the power battery 20 flows from the low-temperature-stage coolant main flow passage 30 into the second PTC heater 26; when the motor 28 works in the running process of the vehicle, the third electromagnetic valve 27 is opened, and the cooling liquid in the water cooling circulation pipeline in the power battery 20 flows out of the low-temperature-level cooling liquid main flow channel 30 and the flow channel formed by connecting the third electromagnetic valve 27 and the water cooling circulation channel of the motor 28 in series and then enters the second PTC heater 26;
Then, the cooling liquid flowing out of the second PTC heater 26 flows through the supercharging air intake intercooler 23 for heat exchange, and the cooling liquid after heat exchange flows back to the low-temperature-level electric control water pump 21 through the low-temperature-level radiator 25 and the third electric control three-way ball valve 22 in sequence and flows into an inlet of a water cooling circulation pipeline of the power battery 20 again for circulating heating of the power battery 20;
the second PTC heater 26 preheats the cooling liquid with given power, the cooling liquid flowing out of the second PTC heater 26 enters the supercharging air intake intercooler 23 for heat exchange, the heat energy of the supercharged air is transferred into the low-temperature-stage cooling loop, and the preheating process of the low-temperature-stage cooling loop is further accelerated by fully utilizing the energy; then the cooling liquid sequentially flows through the high-temperature-level radiator 25, the inlet a and the outlet c of the third electric control three-way ball valve 22 and the low-temperature-level electric control water pump 21, and finally flows through the water cooling circulation flow passage of the power battery 20 and circularly heats the power battery 20; the coolant flowing through the low-temperature-stage radiator 25 does not exchange heat with the outside air in this process.
And 3b, when the temperature of the power battery 20 is detected to be higher than 15 ℃, the heating function of the second PTC heater 26 is turned off, the low-temperature-level electric control water pump 21 is turned off, the preheating is completed, and the operation mode under the normal working condition is entered.
Cooling system control when the vehicle is running under normal working conditions:
the water circulation cooling control process of the high-temperature-stage cooling device comprises the following steps:
and 4a, the inlet a and the outlet c of the second electric control three-way ball valve 11 are in a fully-opened state, and the outlet b of the second electric control three-way ball valve 11 is in a fully-closed state. Firstly, the cooling liquid flowing out of a first cooling circulation pipeline in the engine cylinder cover 1 and the cooling liquid flowing out of a second cooling circulation pipeline in the engine cylinder body 2 pass through a first electric control three-way ball valve 4, then one part of the cooling liquid passes through an engine cooling liquid main flow passage 29, and the other part of the cooling liquid passes through an EGR cooler 7 through a first opened electromagnetic valve 5 to cool the recirculated exhaust gas, so that NOx and knocking tendency are reduced; then cooling liquid is converged into an inlet a of a second electric control three-way ball valve 11, cooling liquid flowing out of an outlet c of the second electric control three-way ball valve 11 fully exchanges heat with the environment in a high-temperature-stage radiator 16 and then flows into a high-temperature-stage electric control water pump 14, an inlet of a first cooling circulation pipeline and an inlet of a second cooling circulation pipeline in an engine cylinder body 2 again in sequence, and the cooling liquid does not pass through a second PTC heater 12, and in the process, the cooling liquid flows of outlets of the engine cylinder cover 1 and the engine cylinder body 2 are distributed by adjusting the rotation angle of the first electric control three-way ball valve 4, so that the temperature of the cooling liquid flowing out of the outlet of the first cooling circulation pipeline is lower than that of the cooling liquid flowing out of the outlet of the second cooling circulation pipeline by 5 ℃; this reduces not only the heat transfer loss of the engine block 2 but also the degree to which the engine head 1 heats the intake air due to the high temperature, reducing pumping loss.
The working process of the high-temperature-level cooling oil circulation device is as follows:
and step 5a, the oil pump 3 supplies oil to an oil duct inlet of the engine cylinder body 2 with calibrated oil pressure and oil quantity according to the state of the engine. The specific process is as follows: the engine oil is sucked out from the oil pan 34 and flows into an inlet a of the oil way three-way valve 13 after sequentially passing through the oil pump 3, the oil filter 32 and various lubricating parts of the engine, part of the engine oil flows out from the oil way three-way valve 13 through an outlet b and then enters the oil pan 34, and the other part of the engine oil flows out from an outlet c of the oil way three-way valve 13 and passes through the engine oil radiator 31 and then sequentially enters the oil pan 34 and the oil pump 3 and circulates to lubricate various parts of the engine, oil temperature control is realized by controlling the oil quantity of the outlet b and the outlet c of the oil way three-way valve 13, when the oil temperature is lower than 110 ℃, the opening of the outlet c is reduced, the opening of the outlet b is increased, the oil temperature is increased, and the defect of friction loss increase caused by excessive viscosity of the engine oil is avoided; when the oil temperature is higher than 130 ℃, the opening of the outlet c is increased, the opening of the outlet b is reduced, and the oil temperature is reduced, so that the dry friction caused by excessive dilution of engine oil is avoided, and the defect of the service life of an engine is avoided. The engine oil temperature is managed to a higher level according to different temperature requirements under different loads and engine working conditions, the engine oil viscosity is reduced, friction loss is reduced, heat transfer loss of the engine is reduced, excessive consumption and coking of the engine oil are avoided, and the requirements of lubricating requirements and minimum accessory power consumption under all working conditions are met.
The working process of the low-temperature-stage cooling device is as follows:
in step 6a, when the power battery 20 is discharged and the motor 28 is operated, the third solenoid valve 27 is opened. When the ambient temperature is lower than 0 ℃ and the temperature of the cooling liquid flowing through the water cooling circulation pipeline in the power battery 20 is lower than 20 ℃, the electric control louver 33 is closed because the heat generation amount is less and the air inlet temperature is low, the low-temperature-stage electric control water pump 21 is still in a closed state, the low-temperature-stage cooling fan 24 is closed, and the heat loss of the battery pack is reduced. When the ambient temperature is not lower than 0 ℃, or when the temperature sensor C collects that the temperature of the cooling liquid in the water cooling circulation pipeline of the power battery 20 is not lower than 20 ℃, or when the temperature sensor D collects that the temperature of the cooling liquid in the water cooling circulation pipeline of the motor 28 is higher than 25 ℃, the electric control shutter 33 is opened, the low-temperature-level electric control water pump is in a low-speed state, the low-temperature-level cooling fan 24 is closed, at the moment, the opening of an inlet a and an inlet b of the third electric control three-way ball valve 22 are regulated, and when the temperature of the cooling liquid in the water cooling circulation pipeline of the power battery 20 is increased, the opening of the inlet a of the third electric control three-way ball valve 22 is gradually increased, so that the windward heat dissipation effect is enhanced; when the temperature of the cooling liquid at the outlet of the water cooling circulation pipeline of the power battery 20 is higher than 30 ℃, the inlet a is fully opened, and the low-temperature-stage cooling fan 24 is started to a low-speed gear; when the temperature of the cooling liquid in the water cooling circulation pipeline of the power battery 20 is higher than 40 ℃ or the temperature of the cooling liquid in the water cooling circulation pipeline of the motor 28 exceeds 50 ℃, the low-temperature-level cooling fan 24 operates at a high speed gear, and the low-temperature-level electric control water pump 21 operates at a high speed to enable the cooling liquid to rapidly dissipate heat; cooling system control during vehicle shutdown:
And (3) controlling a high-temperature-level water circulation device:
in step 7a, when the whole vehicle is stopped and high voltage is applied, the conventional engine cooling system is reduced along with the reduction of the engine speed after the engine is stopped, so that the sudden stop of the engine after high power operation can cause 'hot dipping', and the service life of the engine is seriously damaged. In the high-temperature-stage cooling loop, the high-temperature-stage electric control water pump 14 is kept to work for 2min at the rotating speed with the minimum power consumption after the engine is stopped, and the high-temperature-stage cooling fan 15 is turned off to prevent the engine from being hot-dipped.
Control of the cryogenic stage cooling device:
in step 8a, the low-temperature-stage cooling circuit is turned off after the electric control shutter 33, the low-temperature-stage cooling fan 24 and the low-temperature-stage electric control water pump 21 are powered down along with the whole vehicle due to smaller heat load.
And (3) controlling an air conditioner cooling system under the conditions of engine warm-up and normal working conditions:
the control process when the passenger cabin has refrigeration requirement:
step 9a, in the refrigeration process, the second electromagnetic valve 6 is closed, the air blower 8 is opened, the power battery 20 supplies electric energy to the double-drive air conditioner compressor 18 and drives the double-drive air conditioner compressor 18 to operate, the temperature and the pressure of the refrigerant in the air conditioner cooling system are increased after passing through the double-drive air conditioner compressor 18, heat exchange is carried out between the refrigerant and the environment at the air conditioner condenser 17, the temperature is reduced, the air is reduced in pressure through the air conditioner throttle valve 19, and finally the air blown into the passenger cabin by the air blower 8 is reduced in the air conditioner evaporator 10, and flows back to the inlet of the double-drive air conditioner compressor 18 to complete the refrigeration cycle;
The control process when the passenger cabin has heating requirement:
step 10a, when the passenger has heating requirement, if the engine does not work, the second electromagnetic valve 6 is opened, the inlet a of the second electric control three-way ball valve 11 is fully opened, the outlet b is fully opened, the outlet c is fully closed, the high-temperature-stage electric control water pump 14 works in the minimum power consumption state, at this time, the cooling liquid of the high-temperature-stage cooling circuit flows out from the first cooling circulation pipeline outlet in the engine cylinder cover 1 and the second cooling circulation pipeline outlet in the engine cylinder body 2 and is converged into the first electric control three-way ball valve 4 after passing through the high-temperature-stage electric control water pump 14, and the cooling liquid flows through the engine cooling liquid main flow channel 29 and the warm air heat exchanger 9 on the warm air circuit respectively. The blower 8 is started to transfer the heat of the cooling liquid in the warm air heat exchanger 9 to the air entering the passenger cabin, and then the cooled cooling liquid and the cooling liquid in the engine cooling liquid main runner 29 are converged and then sequentially flow through the second electric control three-way ball valve 11, the first PTC heater 12 and the high-temperature-level electric control water pump 14 to complete heating circulation. The working mode can meet the requirements of engine warming and passenger cabin heating at the same time.
When the passenger has heating requirement, the engine works and is in a warmth state, the step 1a is entered, the second electromagnetic valve 6 is opened, the blower 8 is opened, the heat in the cooling liquid flowing through the second electromagnetic valve 6 and the warm air heat exchanger 9 is transferred to the air entering the passenger cabin, and the cooling liquid is converged with the cooling liquid at the outlet of the engine cooling liquid main flow passage 29 and then continuously circulated; if the engine works and is in a normal working state, the step 4a is entered, the second electromagnetic valve 6 is opened, the blower 8 is opened, heat in the cooling liquid flowing through the second electromagnetic valve 6 and the warm air heat exchanger 9 is transferred to air entering the passenger cabin, and the cooling liquid is continued to circulate after being converged at the engine cooling liquid main flow passage 29 and the outlet of the EGR cooler, so that warm air supply is completed.

Claims (3)

1. A thermal management system for a hybrid heavy truck, characterized by: the system comprises a high-temperature-level cooling system, a low-temperature-level cooling system and an air-conditioning cooling system;
the high-temperature-stage cooling system comprises an engine water circulation cooling device and an engine oil circulation cooling device, the engine water circulation cooling device is divided into a first electric control three-way ball valve (4), two inlets of the first electric control three-way ball valve (4) are respectively connected with a first cooling circulation pipeline outlet in an engine cylinder cover (1) and a second cooling circulation pipeline outlet in an engine cylinder body (2) through a first cooling liquid pipeline provided with a temperature sensor A and a second cooling liquid pipeline provided with a temperature sensor B, and the outlet of the first electric control three-way ball valve (4) is connected with an engine cooling liquid main runner (29), an EGR cooling loop formed by connecting a first electromagnetic valve (5) and an EGR cooler (7) in series and an inlet formed by connecting a second electromagnetic valve (6) and a warm air heat exchanger (9) in series after a warm air loop is converged; an air blower (8) is arranged near the warm air heat exchanger (9), and an inlet a of the second electric control three-way ball valve (11) is connected with an outlet after the engine cooling liquid main flow channel (29), the EGR cooling loop and the warm air loop are converged;
The outlet b of the second electric control three-way ball valve (11) is sequentially connected with the first PTC heater (12) and the high-temperature-level electric control water pump (14) through a small circulation branch of engine cooling liquid, and then is divided into two paths, wherein one path is connected with a first cooling circulation pipeline inlet in the engine cylinder cover (1), and the other path is connected with a second cooling circulation pipeline inlet in the engine cylinder body (2);
the outlet c of the second electric control three-way ball valve (11) is sequentially connected with the high-temperature-level radiator (16) and the high-temperature-level electric control water pump (14) through an engine cooling liquid large circulation branch, and then is divided into two paths, one path is connected with a first cooling circulation pipeline inlet in the engine cylinder cover (1), the other path is connected with a second cooling circulation pipeline inlet in the engine cylinder body (2), and the high-temperature-level cooling fan (15) is arranged close to the high-temperature-level radiator (16);
the engine oil circulating cooling device comprises an oil way three-way valve (13), wherein an inlet a of the oil way three-way valve (13) is connected with an oil way outlet of an engine cylinder body (2) through an oil outlet pipeline provided with a temperature sensor E, an outlet c of the oil way three-way valve (13) is sequentially connected with an engine oil radiator (31), an oil pan (34), an oil pump (3), an oil filter (32) and an oil way inlet of the engine cylinder body (2) through an oil way large circulation pipeline, an outlet b of the oil way three-way valve (13) is communicated with the oil way large circulation pipeline between the engine oil radiator (31) and the oil pan (34) through an oil way small circulation pipeline, and the engine oil radiator (31) is arranged outside a high-temperature radiator (16);
The low-temperature-stage cooling system comprises a third electric control three-way ball valve (22), wherein the C outlet of the third electric control three-way ball valve (22) is sequentially connected with a low-temperature-stage electric control water pump (21), a water cooling circulation pipeline in a power battery (20), a temperature sensor C, a third electromagnetic valve (27), a water cooling circulation pipeline of a motor (28), a temperature sensor D, a second PTC heater (26), a supercharged air charge intercooler (23), a low-temperature-stage radiator (25) and an a inlet of the third electric control three-way ball valve (22) through a first circulation pipeline, an electric control shutter (33) is positioned at the outer side of the radiator, a low-temperature-stage cooling fan (24) is positioned at the inner side of the radiator, one end of a low-temperature-stage small circulation branch is communicated with a first circulation pipeline positioned between the air charge intercooler and the second PTC heater (26) and the other end of the low-temperature-stage cooling fluid main pipeline (30) is communicated with a first circulation pipeline positioned between the temperature sensor C and the third electromagnetic valve (27) and the other end of the low-temperature-stage cooling fluid main pipeline (30) is communicated with a low-temperature-stage cooling fan (24) and the low-temperature-stage cooling fan (24) is in a high-speed stop mode;
The air conditioner cooling system comprises an outlet of an air conditioner condenser (17), an air conditioner throttle valve (19), an air conditioner evaporator (10), a double-drive air conditioner compressor (18) and an inlet of the air conditioner condenser (17) which are sequentially connected through a second circulation pipeline, the air conditioner condenser (17) is arranged on the outer side of a high-temperature-level radiator (16), a driven belt pulley assembly with an electromagnetic clutch is arranged on an external input shaft of the double-drive air conditioner compressor (18), a driven belt pulley in the driven belt pulley assembly is connected with a belt pulley on a crankshaft of an engine through a belt, and when the controller of the air conditioner compressor receives an air conditioner starting signal and judges that the engine is working, the controller of the air conditioner compressor enables the electromagnetic clutch to be closed; when the controller of the air conditioner compressor receives an air conditioner closing signal, the electromagnetic clutch is disconnected; the rotating shaft of the built-in driving motor is connected with the rotating shaft of the double-driving air conditioner compressor (18), a control line of the built-in driving motor is connected with a controller of the air conditioner compressor, when the controller of the air conditioner compressor receives an air conditioner starting signal and the engine is stopped, the electromagnetic clutch is in a disconnected state, and the controller of the air conditioner compressor outputs an operation signal to the built-in driving motor through the control line to control the built-in driving motor to rotate, so that the air conditioner compressor is driven to work; when the controller of the air conditioner compressor receives an air conditioner closing signal, the controller of the air conditioner compressor outputs a stall signal to the built-in driving motor to control the built-in driving motor to stall; the power line of the built-in driving motor is connected with the high-voltage circuit where the power battery (20) is located, and power is supplied through the high-voltage circuit where the power battery (20) is located.
2. The thermal management system of a hybrid heavy-duty truck of claim 1, wherein: the oil pump (3) adopts a variable-displacement electric control oil pump (3).
3. A method for controlling a thermal management system of a hybrid heavy truck employing the system of any one of claims 1-2, comprising cooling system control during warm-up of a cold start of a vehicle, during normal operation of the vehicle and during shutdown of the vehicle, said cooling system control being divided into high temperature level cooling system control, low temperature level cooling system control and air conditioning cooling system control, said high temperature level cooling system control comprising high temperature level cooling device water circulation cooling control and high temperature level cooling device oil circulation cooling control:
wherein: cooling system control during warm-up of vehicle cold start:
the water circulation cooling control process of the high-temperature-stage cooling device comprises the following steps:
step 1a, a high-temperature-stage electric control water pump (14) operates in a low-rotation speed mode for avoiding local overheating of an engine, cooling liquid flowing out of a first cooling circulation pipeline outlet in an engine cylinder cover (1) and cooling liquid flowing out of a second cooling circulation pipeline in the engine cylinder body (2) sequentially pass through a first electric control three-way ball valve (4), an engine cooling liquid main flow channel (29), an inlet a of a second electric control three-way ball valve (11), an outlet B of the second electric control three-way ball valve (11) which is fully opened, a first PTC heater (12) and the high-temperature-stage electric control water pump (14) and then return to the first cooling circulation pipeline inlet in the engine cylinder cover (1) and the second cooling circulation pipeline inlet in the engine cylinder body (2) respectively, in the process, according to temperature signals acquired by a temperature sensor A and a temperature sensor B, the ball valve rotation angle of a first electric control three-way ball valve (4) is regulated, and the flow distribution of a first cooling circulation pipeline and a second cooling circulation management is controlled, so that the heat exchange amount of cooling liquid in the first cooling circulation pipeline and an engine cylinder cover (1) and the heat exchange amount of cooling liquid in the second cooling circulation pipeline and an engine cylinder body (2) are controlled, and the temperature of outlet cooling liquid of the second cooling circulation pipeline is 5 ℃ higher than that of the first cooling circulation pipeline;
Step 1b, when the temperature of the outlet cooling liquid of the second cooling circulation pipeline and the temperature of the outlet cooling liquid of the first cooling circulation pipeline reach more than 85 ℃, judging that the engine is warmed up, gradually closing the outlet b of the second electric control three-way ball valve (11) in step 1a, closing the first PTC heater (12), gradually opening the outlet c of the second electric control three-way ball valve (11) to be fully opened, and enabling the inlet a cooling liquid flowing into the second electric control three-way ball valve (11) in step 1a to flow through the outlet c of the second electric control three-way ball valve (11) to flow through the high-temperature-stage radiator (16) and the high-temperature-stage electric control water pump (14) and then return to the inlet of the first cooling circulation pipeline in the engine cylinder cover (1) and the inlet of the second cooling circulation pipeline in the engine cylinder body (2) respectively;
the working process of the high-temperature-level cooling oil circulation device is as follows:
step 2a, the engine oil sucked by the engine oil pump (3) from the oil pan (34) flows into an inlet a of the oil way three-way valve (13) and an outlet b of the oil way three-way valve (13) after passing through the engine oil filter (32) and each lubricating part of the engine, and the engine oil returns to the oil pan (34) again and flows into the inlet of the engine oil pump (3) to enter the next circulation, so that each part of the engine is lubricated;
step 2b, when the temperature of the engine oil detected by the temperature sensor E reaches more than 100 ℃, judging that the engine oil is completely preheated, and entering step 5 a;
The working process of the low-temperature-stage cooling device is as follows:
step 3a, when the temperature sensor C detects that the temperature of the cooling liquid in the water cooling circulation pipeline in the battery pack of the power battery (20) is lower than 10 ℃, the electric control shutter (33) is closed, the low-temperature-level cooling fan (24) is closed, the low-temperature-level electric control water pump (21) works in a minimum power state, the low-temperature-level cooling liquid circulation is maintained to have a certain flow rate, the inlet a of the third electric control three-way ball valve (22) is fully opened, the inlet b of the third electric control three-way ball valve (22) is closed, at first, if the motor (28) does not work in the running process of the vehicle, the third electromagnetic valve (27) is closed, and the cooling liquid in the water cooling circulation pipeline in the power battery (20) flows into the second PTC heater (26) from the low-temperature-level cooling liquid main flow channel (30); when the motor (28) works in the running process of the vehicle, the third electromagnetic valve (27) is opened, and the cooling liquid in the water cooling circulation pipeline in the power battery (20) flows out of the low-temperature-level cooling liquid main flow channel (30) and the flow channel formed by connecting the third electromagnetic valve (27) and the water cooling circulation channel of the motor (28) in series and then enters the second PTC heater (26);
then, the cooling liquid flowing out of the second PTC heater (26) flows through the supercharging air intake intercooler (23) for heat exchange, and the cooling liquid after heat exchange flows back to the low-temperature-level electric control water pump (21) through the low-temperature-level radiator (25) and the third electric control three-way ball valve (22) in sequence and flows into an inlet of a water cooling circulation pipeline of the power battery (20) again for circularly heating the power battery (20);
Step 3b, when the temperature of the power battery (20) is detected to be higher than 15 ℃, the heating function of the second PTC heater (26) is closed, the low-temperature-level electric control water pump (21) is closed, the preheating is completed, and the operation mode under the normal working condition is entered;
cooling system control when the vehicle is running under normal working conditions:
the water circulation cooling control process of the high-temperature-stage cooling device comprises the following steps:
step 4a, the inlet a and the outlet c of the second electric control three-way ball valve (11) are in a fully-opened state, and the outlet b of the second electric control three-way ball valve (11) is in a fully-closed state; firstly, cooling liquid flowing out of a first cooling circulation pipeline in an engine cylinder cover (1) and cooling liquid flowing out of a second cooling circulation pipeline in an engine cylinder body (2) pass through a first electric control three-way ball valve (4), then one part of the cooling liquid passes through an engine cooling liquid main flow passage (29), and the other part of the cooling liquid passes through an EGR cooler (7) through a first electromagnetic valve (5) which is opened to cool recirculated exhaust gas; then cooling liquid is converged into an inlet a of a second electric control three-way ball valve (11), cooling liquid flowing out of an outlet c of the second electric control three-way ball valve (11) fully exchanges heat with the environment in a high-temperature-level radiator (16), and then flows into a high-temperature-level electric control water pump (14) and an inlet of a first cooling circulation pipeline and an inlet of a second cooling circulation pipeline in an engine cylinder body (2) in sequence, and in the process, the cooling liquid flow of an outlet of an engine cylinder cover (1) and an outlet of the engine cylinder body (2) is distributed by adjusting the rotation angle of the first electric control three-way ball valve (4), so that the temperature of the cooling liquid flowing out of the outlet of the first cooling circulation pipeline is lower than that of the cooling liquid flowing out of the outlet of the second cooling circulation pipeline by 5 ℃;
The working process of the high-temperature-level cooling oil circulation device is as follows:
step 5a, the oil pump (3) supplies oil to an oil duct inlet of the engine cylinder body (2) according to the engine state with calibrated oil pressure and oil quantity; the specific process is as follows: the engine oil is sucked out from the oil pan (34), sequentially passes through the oil pump (3), the oil filter (32) and various lubricating parts of the engine and flows into an inlet a of the oil way three-way valve (13), part of the engine oil flows out of the oil way three-way valve (13) through an outlet b and then enters the oil pan (34), and the other part of the engine oil flows out of an outlet c of the oil way three-way valve (13) and passes through the engine oil radiator (31) and then sequentially enters the oil pan (34) and the oil pump (3) to lubricate various parts of the engine in a circulating way, oil temperature control is realized by controlling the oil quantity of the outlet b and the outlet c of the oil way three-way valve (13), and when the oil temperature is lower than 110 ℃, the opening of the outlet c is reduced, the opening of the outlet b is increased, and the oil temperature is increased; when the oil temperature is higher than 130 ℃, increasing the opening of the outlet c and reducing the opening of the outlet b;
the working process of the low-temperature-stage cooling device is as follows:
step 6a, when the power battery (20) discharges and the motor (28) works, the third electromagnetic valve (27) is opened; when the ambient temperature is lower than 0 ℃ and the temperature of the cooling liquid flowing through a water cooling circulation pipeline in the power battery (20) is lower than 20 ℃, the electric control shutter (33) is closed, the low-temperature-level electric control water pump (21) is still in a closed state, and the low-temperature-level cooling fan (24) is closed; when the ambient temperature is not lower than 0 ℃, or when the temperature sensor C collects the temperature of the cooling liquid in the water cooling circulation pipeline of the power battery (20) to be not lower than 20 ℃, or when the temperature sensor D collects the temperature of the cooling liquid in the water cooling circulation pipeline of the motor to be higher than 25 ℃, the electric control shutter (33) is opened, the low-temperature-level electric control water pump (21) is in a low-speed state, the low-temperature-level cooling fan (24) is closed, and at the moment, the opening of an inlet a and an inlet b of the third electric control three-way ball valve (22) is regulated, and when the temperature of the cooling liquid in the water cooling circulation pipeline of the power battery (20) is increased, the opening of an inlet a of the third electric control three-way ball valve (22) is gradually increased; when the temperature of cooling liquid at the outlet of a water cooling circulation pipeline of the power battery (20) is higher than 30 ℃, the inlet a of the third electric control three-way ball valve (22) is fully opened, and the low-temperature-stage cooling fan (24) is started to a low gear; when the temperature of the cooling liquid in the water cooling circulation pipeline of the power battery (20) is higher than 40 ℃ or the temperature of the cooling liquid in the water cooling circulation pipeline of the motor exceeds 50 ℃, the low-temperature-level cooling fan (24) operates at a high speed, and the low-temperature-level electric control water pump (21) operates at a high speed to enable the cooling liquid to dissipate heat rapidly; cooling system control during vehicle shutdown:
And (3) controlling a high-temperature-level water circulation device:
step 7a, in the high-temperature-stage cooling loop, keeping the high-temperature-stage electric control water pump (14) to work for 2 minutes at the rotating speed with the minimum power consumption after the engine is stopped, and closing the high-temperature-stage cooling fan (15);
control of the cryogenic stage cooling device:
step 8a, the low-temperature-level cooling loop is closed after the electric control shutter (33), the low-temperature-level cooling fan (24) and the low-temperature-level electric control water pump (21) are powered down along with the whole vehicle due to smaller heat load;
and (3) controlling an air conditioner cooling system under the conditions of engine warm-up and normal working conditions:
the control process when the passenger cabin has refrigeration requirement:
step 9a, in the refrigeration process, the second electromagnetic valve (6) is closed, the air blower (8) is opened, electric energy is provided for the double-drive air conditioner compressor (18) through the power battery (20) and drives the double-drive air conditioner compressor (18) to operate, the temperature and the pressure of the refrigerant in the air conditioner cooling system are increased after passing through the double-drive air conditioner compressor (18), heat exchange is carried out between the air conditioner condenser (17) and the environment, the temperature is reduced, the air is reduced through the air conditioner throttle valve (19), and finally the air blown into the passenger cabin by the air blower (8) is cooled in the air conditioner evaporator (10), and flows back to the inlet of the double-drive air conditioner compressor (18) to complete the refrigeration cycle;
the control process when the passenger cabin has heating requirement:
Step 10a, when the passenger has heating requirements, if the engine does not work, the second electromagnetic valve (6) is opened, the inlet a of the second electric control three-way ball valve (11) is fully opened, the outlet b is fully opened, the outlet c is fully closed, the high-temperature-stage electric control water pump (14) works in the minimum power consumption state, at the moment, the cooling liquid of the high-temperature-stage cooling loop flows out from the first cooling circulation pipeline outlet in the engine cylinder cover (1) and the second cooling circulation pipeline outlet in the engine cylinder body (2) and is converged into the first electric control three-way ball valve (4) after passing through the high-temperature-stage electric control water pump (14), and the cooling liquid flows through the engine cooling liquid main runner (29) and the warm air heat exchanger (9) on the warm air loop respectively; the blower (8) is started to transfer the heat of the cooling liquid in the warm air heat exchanger (9) to the air entering the passenger cabin, and then the cooled cooling liquid and the cooling liquid in the engine cooling liquid main flow passage (29) are converged and then sequentially flow through the second electric control three-way ball valve (11), the first PTC heater (12) and the high-temperature-level electric control water pump (14) to complete heating circulation;
when the passenger has heating requirements, the engine works and is in a warmth state, the step 1a is started, the second electromagnetic valve (6) is started, the blower (8) is opened, heat in cooling liquid flowing through the second electromagnetic valve (6) and the warm air heat exchanger (9) is transferred to air entering the passenger cabin, and the cooling liquid is converged with cooling liquid at the outlet of the engine cooling liquid main flow channel (29) and then continuously circulated; if the engine works and is in a normal working state, the step 4a is entered, the second electromagnetic valve (6) is opened, the air blower (8) is opened, heat in cooling liquid flowing through the second electromagnetic valve (6) and the warm air heat exchanger (9) is transferred to air entering the passenger cabin, and cooling liquid at the outlet of the engine cooling liquid main flow channel (29) and the outlet of the EGR cooler (7) is converged and then is continuously circulated, so that warm air supply is completed.
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