CN109578126B - High and low temperature dual cycle cooling system for hybrid vehicle - Google Patents

High and low temperature dual cycle cooling system for hybrid vehicle Download PDF

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Publication number
CN109578126B
CN109578126B CN201811279707.5A CN201811279707A CN109578126B CN 109578126 B CN109578126 B CN 109578126B CN 201811279707 A CN201811279707 A CN 201811279707A CN 109578126 B CN109578126 B CN 109578126B
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temperature
low
cooling
cooling system
cooling fan
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CN109578126A (en
Inventor
仲蕾
董江峰
牛海杰
赵斌
王旭兰
王尚学
陈晋兵
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China North Engine Research Institute Tianjin
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China North Engine Research Institute Tianjin
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P3/00Liquid cooling
    • F01P3/20Cooling circuits not specific to a single part of engine or machine
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00Pumping cooling-air or liquid coolants
    • F01P5/02Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00Pumping cooling-air or liquid coolants
    • F01P5/10Pumping liquid coolant; Arrangements of coolant pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/02Controlling of coolant flow the coolant being cooling-air
    • F01P7/04Controlling of coolant flow the coolant being cooling-air by varying pump speed, e.g. by changing pump-drive gear ratio
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/14Controlling of coolant flow the coolant being liquid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/14Controlling of coolant flow the coolant being liquid
    • F01P7/16Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/165Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K9/00Arrangements for cooling or ventilating
    • H02K9/19Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
    • H02K9/193Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00Pumping cooling-air or liquid coolants
    • F01P5/02Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P2005/025Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers using two or more air pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01PCOOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00Controlling of coolant flow
    • F01P7/14Controlling of coolant flow the coolant being liquid
    • F01P2007/146Controlling of coolant flow the coolant being liquid using valves
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/60Other road transportation technologies with climate change mitigation effect
    • Y02T10/64Electric machine technologies in electromobility

Abstract

The invention provides a high-low temperature double-circulation cooling system for a hybrid power vehicle, which comprises a high-temperature circulation system, a low-temperature circulation system and an electronic control unit, wherein the high-temperature circulation system comprises a water pump, an engine body, a cylinder cover, a heat dissipation valve, a high-temperature radiator, a high-temperature cooling fan and temperature acquisition equipment; the low-temperature circulating system comprises a water pump, an engine body, a cylinder cover, a heat dissipation part, a flow regulating valve, a thermostat, a low-temperature radiator, a low-temperature cooling fan, temperature acquisition equipment, a generator and a controller; the electronic control unit is mainly used for adjusting the flow of a cooling medium of the high-low temperature circulating system through the flow adjusting valve, adjusting the rotating speed of the high-temperature cooling fan according to the temperature of the high-temperature cooling medium, realizing closed-loop control of the temperature of the medium flowing into a cylinder cover of the engine body, and adjusting the rotating speed of the low-temperature cooling fan according to the low-temperature cooling medium temperature acquisition system, so as to realize closed-loop control of the temperature of the medium flowing into the generator and the controller.

Description

High and low temperature dual cycle cooling system for hybrid vehicle
Technical Field
The invention belongs to the technical field of automobile hybrid power, and particularly relates to a high-low temperature dual-cycle cooling system for a hybrid power vehicle.
Background
With the increasing requirements of energy conservation and emission reduction of automobiles, a hybrid vehicle engine and generator thermal management system faces new challenges. Most hybrid vehicles are faced with two sets of cooling systems, namely diesel engine cooling systems, the proper working temperature of the cooling medium is about 80-95 ℃, the relative temperature is high, and the proper temperature of the working medium in the generator and controller cooling systems is about 50-70 ℃, and the relative temperature is low. Because the working temperatures of the two cooling systems are different, the two cooling systems are mostly matched with two circulating systems in the application of the vehicle, two water pumps and two expansion water tanks are needed to be configured, and in addition, two water pump driving systems are needed, so that the system is relatively loaded and has relatively large volume.
Disclosure of Invention
In view of the above, the present invention is directed to a high-low temperature dual-cycle cooling system for a hybrid vehicle, so as to solve the problems of complex structure, complex system and the like caused by two sets of cooling systems of the hybrid vehicle, and meanwhile, the present invention can also be used in other fields requiring two or even more sets of cooling systems.
The main inventive concept of the invention is as follows: aiming at simplifying a cooling system and reducing the volume and the mass of the cooling system of the hybrid vehicle, the invention adopts a double-circulation cooling system of a water pump and a water tank. The system consists of a water pump, a flow regulating valve, a thermostat, two sets of fan radiator assemblies, an electronic control unit and a plurality of temperature acquisition devices. The thermostat is designed to accelerate the temperature rise of the cooling medium during the engine starting.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the high-low temperature double-circulation cooling system for the hybrid power vehicle comprises a water pump, a flow regulating valve, a thermostat, a high-temperature radiator, a high-temperature cooling fan, a low-temperature radiator, a low-temperature cooling fan, an electronic control unit and a plurality of temperature sensors, wherein the water pump is connected with the high-temperature cooling system for cooling the diesel engine through a pipeline; the temperature sensors are in signal connection with the electronic control unit and are respectively used for collecting the engine inlet temperature, the engine outlet temperature, the generator inlet temperature and the generator outlet temperature, and the flow regulating valve, the high-temperature cooling fan and the low-temperature cooling fan are in signal connection with the electronic control unit.
Furthermore, the flow regulating valve adopts two paths of flow regulating devices based on the digital PID control principle.
Furthermore, the high-temperature cooling fan and the low-temperature cooling fan are both driven by a direct-current power supply, the rotating speed of the fans is adjusted by the electronic control unit, rotating speed signals are input through high-level effective digital PWM, and meanwhile, high-level effective feedback signals are output.
Further, the thermostat is a wax thermostat or an electronic thermostat.
Compared with the prior art, the invention has the following advantages:
the invention adopts one water pump to realize the flow of cooling media of two sets of circulating systems, reduces one set of water pump and driving system, mixes the cooling media of the high-temperature circulating system after passing through the high-temperature radiator with the cooling media of the low-temperature circulating system after passing through the heat source (generator and controller) or thermostat, and the temperature of the two is relatively close to that of the low-temperature circulating system during normal work, thereby avoiding the temperature fluctuation caused by mixing, and simultaneously, the cooling media of the high-heat source of the diesel engine is divided into two paths for cooling, and one path is distributed to the low-temperature radiator of the low-temperature circulating system, thereby reducing the cooling requirement on the. In addition, the diesel engine and the generator can work in series due to the existence of the flow regulating valve and the thermostat during cold starting, and the rapid temperature rise of the cooling medium is accelerated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of a high-low temperature dual cycle cooling system for a hybrid vehicle according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
A high-low temperature dual cycle cooling system for a hybrid vehicle, as shown in FIG. 1, includes a water pump, a flow regulating valve, a thermostat, a high temperature radiator, a high temperature cooling fan, a low temperature radiator, a low temperature cooling fan, an electronic control unit, and a plurality of temperature sensors,
the water pump is connected with a high-temperature cooling system for cooling the diesel engine through a pipeline, a water outlet of the high-temperature cooling system of the diesel engine is connected with a flow regulating valve, the flow regulating valve is provided with two paths of flow regulating devices, one path of outlet is communicated with the water pump through a high-temperature radiator, the other path of outlet is communicated with a low-temperature cooling system for cooling the generator and the controller through a thermostat and a low-temperature radiator in sequence, and a water outlet of the low-temperature cooling system is communicated with the;
the temperature sensors are in signal connection with the electronic control unit and are respectively used for collecting the engine inlet temperature, the engine outlet temperature, the generator inlet temperature and the generator outlet temperature, and the flow regulating valve, the high-temperature cooling fan and the low-temperature cooling fan are in signal connection with the electronic control unit.
The water pump, the high-temperature cooling system for cooling the diesel engine, the flow regulating valve (high-temperature branch), the high-temperature radiator, the high-temperature cooling fan, the electronic control unit and the plurality of temperature sensors form a high-temperature circulating system;
the water pump, the high-temperature cooling system for cooling the diesel engine, the flow regulating valve (low-temperature branch), the thermostat, the low-temperature radiator, the low-temperature cooling fan, the low-temperature cooling system for cooling the generator and the controller, the electronic control unit and the temperature sensors form a low-temperature circulating system.
The technical scheme of the invention is that the electronic control unit controls the flow of the cooling medium of the high-temperature and low-temperature circulating systems through the flow regulating valve and controls the heat dissipation capacity of each circulating cooling medium through the fan, thereby realizing the closed-loop real-time control of the temperature of each circulating cooling medium.
The flow regulating valve adopts two paths of flow regulating devices based on the digital PID control principle, one path is used for controlling the flow of the cooling medium entering the low-temperature cooling system, the other path is used for controlling the flow of the cooling medium entering the high-temperature cooling system, and the two paths are independent and do not interfere with each other. Meanwhile, the flow regulating valve also comprises auxiliary elements such as a stepping motor, a manual balance valve, a flow sensor and the like.
The high-temperature radiator and the low-temperature radiator are widely used fin radiators at present, but are not limited to the fin radiators.
The high-temperature cooling fan and the low-temperature cooling fan are both driven by a direct-current power supply, the rotating speed of the fans is adjusted by the electronic control unit, rotating speed signals are input through high-level effective digital PWM, and meanwhile, high-level effective feedback signals are output.
The thermostat can adopt a wax thermostat or an electronic thermostat, and has the main function of selecting a medium circulation pipeline according to the medium temperature, wherein the temperature is higher than 50 ℃ (the thermostat is not limited to the temperature and can be set according to the requirements of a generator and a controller) and does not pass through a low-temperature radiator pipeline, otherwise, the thermostat passes through the radiator pipeline.
The temperature acquisition mainly comprises the temperature of an inlet and an outlet of the engine and the temperature of an inlet and an outlet of the motor and the controller. The temperature sensors for temperature acquisition are in direct contact with the cooling liquid, change the temperature change signals into electric signals through self heat-sensitive characteristics, and transmit temperature information to the electronic control unit.
The high-temperature and low-temperature cooling system maintains the flow of high-temperature and low-temperature circulating media through the same water pump, the cooling liquid passing through the high-temperature radiator is mixed with the cooling liquid passing through the generator and the controller and enters the cooling water pump, and the temperature and the flow rate of circulating water are regulated through the electronic control unit.
The electronic control unit is mainly used for controlling a cooling system of the engine and is integrated in an ECU of the diesel engine, a main control strategy is shown in that the electronic control unit transmits signals to a flow regulating valve (low temperature) and a thermostat to regulate the flow entering a low-temperature cooling system and a low-temperature radiator, meanwhile, PWM voltage signals are transmitted to the low-temperature cooling fan to control the rotating speed of the fan, so that the low-temperature radiator exchanges heat to meet the heat dissipation requirement of the low-temperature cooling system, a temperature signal obtained after the low-temperature cooling medium and a high-temperature cooling medium are mixed is an engine inlet temperature signal, and the temperature can be regulated through the flow regulating valve (high temperature) and the high.
Specifically, the high-temperature circulating system controls the flow regulating valve in real time through the electronic control unit according to the inlet and outlet temperatures of the engine to realize flow regulation of the high-temperature circulating system, and realizes closed-loop control on the rotating speed of a high-temperature cooling fan of the high-temperature circulating system according to the temperature of a medium before entering the high-temperature cooling system of the diesel engine to ensure that the diesel engine works at a proper temperature.
The low-temperature circulating system controls the flow regulating valve through the electronic control unit to realize the flow regulation of the low-temperature circulating system, realizes the closed-loop control of the rotating speed of a low-temperature cooling fan of the low-temperature circulating system according to the temperature of a medium before entering the low-temperature cooling system of the motor and the controller thereof, ensures that the generator and the controller thereof work at proper temperature, and normally has the temperature of the circulating medium lower than 50 ℃ under the working condition of cold starting, needs to be quickly heated because the temperature of the cooling medium is lower, and opens a low-temperature radiator assembly of the low-temperature circulating system through the thermostat, so that the cooling medium does not flow through the low-temperature radiator to connect a diesel engine and a heat source of the generator in series, thereby accelerating the heating rate of the; when the temperature of the cooling medium is higher than 50 ℃, the cooling medium is started and flows through the low-temperature radiator to enter equipment such as a generator and the like.
The invention adopts one water pump to realize the flow of cooling media of two sets of circulating systems, reduces one set of water pump and driving system, mixes the cooling media of the high-temperature circulating system after passing through a high-temperature radiator with the cooling media of the low-temperature circulating system after passing through a heat source (a generator and a controller) or a thermostat, and the temperature of the two is relatively close to that of the low-temperature circulating system during normal work, thereby avoiding the temperature fluctuation caused by mixing, simultaneously dividing the cooling media of the high-temperature heat source of the diesel engine into two paths for cooling, and distributing one path to the low-temperature radiator of the low-temperature circulating system, thereby reducing the cooling requirement on the high-temperature circulating system, and in addition, the series connection work of the diesel engine and the generator can be realized due to the existence of a.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (4)

1. A high low temperature dual cycle cooling system for hybrid vehicle, its characterized in that: comprises a water pump, a flow regulating valve, a thermostat, a high-temperature radiator, a high-temperature cooling fan, a low-temperature radiator, a low-temperature cooling fan, an electronic control unit and a plurality of temperature sensors,
the water pump is connected with a high-temperature cooling system for cooling the diesel engine through a pipeline, a water outlet of the high-temperature cooling system is connected with a flow regulating valve, the flow regulating valve is provided with two paths of flow regulating devices, one path of outlet is communicated with the water pump through a high-temperature radiator, the other path of outlet is communicated with a low-temperature cooling system for cooling the generator and the controller through a thermostat and a low-temperature radiator in sequence, and a water outlet of the low-temperature cooling system is communicated with the water pump;
the equal signal connection electronic control unit of a plurality of temperature sensor, a plurality of temperature sensor are used for gathering engine coolant liquid entry temperature, engine coolant liquid exit temperature, generator coolant liquid entry temperature, generator coolant liquid exit temperature respectively, the equal signal connection electronic control unit of flow control valve, high temperature cooling fan and low temperature cooling fan.
2. The high-low temperature dual cycle cooling system for a hybrid vehicle according to claim 1, characterized in that: the flow regulating valve adopts two paths of flow regulating devices based on the digital PID control principle.
3. The high-low temperature dual cycle cooling system for a hybrid vehicle according to claim 1, characterized in that: the high-temperature cooling fan and the low-temperature cooling fan are both driven by a direct-current power supply, the rotating speed of the fans is adjusted by the electronic control unit, rotating speed signals are input through high-level effective digital PWM, and meanwhile, high-level effective feedback signals are output.
4. The high-low temperature dual cycle cooling system for a hybrid vehicle according to claim 1, characterized in that: the thermostat is a wax thermostat or an electronic thermostat.
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