CN108790787B - Control method and control system for hybrid vehicle thermal management system - Google Patents

Control method and control system for hybrid vehicle thermal management system Download PDF

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Publication number
CN108790787B
CN108790787B CN201810541137.6A CN201810541137A CN108790787B CN 108790787 B CN108790787 B CN 108790787B CN 201810541137 A CN201810541137 A CN 201810541137A CN 108790787 B CN108790787 B CN 108790787B
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temperature
engine
motor
fan
mode
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CN108790787A (en
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徐鹏
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Zhejiang Geely Holding Group Co Ltd
Zhejiang Liankong Technologies Co Ltd
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Zhejiang Geely Holding Group Co Ltd
Geely Automobile Research Institute Ningbo Co Ltd
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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/02—Controlling of coolant flow the coolant being cooling-air
    • F01P7/08—Controlling of coolant flow the coolant being cooling-air by cutting in or out of pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
    • F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
    • F02N19/10—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines by heating of engine coolants

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Hybrid Electric Vehicles (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention provides a control method and a control system for a hybrid vehicle thermal management system, and relates to the field of vehicle thermal management systems, wherein the control method comprises the steps of comparing the residual electric quantity of a current battery of a hybrid vehicle with the lowest residual electric quantity in a pure electric driving mode; determining that the running mode of the hybrid vehicle is a pure electric running mode or a hybrid running mode; judging whether the temperature of the engine coolant of the hybrid vehicle is higher than the lowest temperature of the coolant when the engine is started; when the temperature of the engine coolant is not higher than the lowest temperature of the coolant when the engine is started, determining whether the motor preheats the engine and whether the fan works; and when the temperature of the engine coolant is higher than the lowest temperature of the coolant when the engine is started, the motor is determined to be independently cooled and the fan does not work in the pure electric driving mode. The invention solves the problem that the control method of the heat management system in the prior art cannot rapidly increase the temperature of the engine, so that the cooling efficiency of the heat management system of the hybrid vehicle is low.

Description

Control method and control system for hybrid vehicle thermal management system
Technical Field
The invention relates to the field of vehicle thermal management systems, in particular to a control method and a control system for a hybrid vehicle thermal management system.
Background
The hybrid power is different from the traditional gasoline power and electric drive hybrid power automobile, the hybrid power driving principle and the driving unit are the same as those of an electric vehicle, so the hybrid power automobile is called as a hybrid power automobile because the battery capacity is relatively large, the battery can be charged by an external power grid, and the hybrid power automobile can run in a pure electric mode. During the running process of the vehicle, the components such as the engine, the motor, the battery and the like generate a large amount of heat in the working process, so that the temperature of the power components is continuously increased, and the working efficiency, the working life and the working of the engine, the motor and the battery require that the hybrid electric vehicle is provided with a set of cooling system different from the traditional vehicle, so that the set of cooling system can ensure that the temperature of the engine, the motor and the battery during the working process is controlled within a reasonable range.
The conventional hybrid power heat management system is simple and generally does not carry out layered cooling on hybrid power parts, so that the conventional heat management system cannot well preheat an engine which does not reach a specified temperature by using a motor so as to achieve the purpose of rapidly increasing the temperature of the engine, and the cooling efficiency is low, so that the energy consumption of the whole hybrid power system is high.
Disclosure of Invention
The invention aims to provide a control method and a control system for a thermal management system of a hybrid vehicle, so as to solve the problem that the cooling efficiency of the thermal management system of the hybrid vehicle is low due to the fact that the temperature of an engine cannot be rapidly increased by the control method of the thermal management system in the prior art.
It is another object of the present invention to reduce energy consumption of a vehicle hybrid system.
In particular, the invention provides a control method for a hybrid vehicle thermal management system, comprising:
comparing the residual capacity of the current battery of the hybrid electric vehicle with the lowest residual capacity of the hybrid electric vehicle in the pure electric driving mode;
determining that the running mode of the hybrid vehicle is a pure electric running mode or a hybrid running mode according to the comparison result;
judging whether the temperature of the engine coolant of the hybrid vehicle is higher than the lowest temperature of the coolant when the engine is started;
when the temperature of the engine coolant is not higher than the lowest temperature of the coolant when the engine is started, determining whether the motor preheats the engine and whether the fan works; or
When the temperature of the engine coolant is higher than the lowest temperature of the coolant when the engine is started, the hybrid vehicle determines that the motor is independently cooled and the fan does not work in the pure electric running mode, or determines whether the motor cools the engine and the fan works in the hybrid running mode.
Further, the hybrid vehicle determining whether the motor cools the engine and the fan is operated in the hybrid travel mode when the temperature of the engine coolant is greater than the minimum temperature of the coolant at the time of engine start, includes:
judging whether the temperature of the motor is higher than the lowest temperature of the engine in the large-cycle working;
judging whether the temperature of the motor is higher than that of the fan or not;
and determining whether the motor is independently cooled, whether the engine is in a large-cycle working mode or a small-cycle working mode or a cooling mode connected with the motor in series and whether the fan works according to the judgment results of the temperature of the motor, the lowest temperature of the engine in the large-cycle working and the temperature of the fan.
Further, determining whether the motor is independently cooled, the engine is in a large-cycle working mode or a small-cycle working mode or a cooling mode connected with the motor in series and the fan is operated according to the judgment results of the temperature of the motor, the lowest temperature when the engine is in a large-cycle working state and the temperature of the fan respectively, comprising the following steps:
the temperature of the motor is less than or equal to the lowest temperature of the engine when the engine works in a large cycle, the temperature of the motor is less than or equal to the temperature of the fan, the motor is independently cooled, the engine works in a small cycle working mode, and the fan does not work;
the temperature of the motor is less than or equal to the lowest temperature of the engine in the large-cycle working process, the temperature of the motor is greater than the temperature of the fan, the motor is independently cooled, the engine is in a small-cycle working mode, and the fan does not work;
the motor temperature is higher than the lowest temperature of the engine when the engine works in a large cycle, the motor temperature is lower than or equal to the temperature of the fan, the motor and the engine are connected in series for cooling, and the fan does not work;
the motor temperature is higher than the lowest temperature of the engine when the engine works in a large circulation mode, the motor temperature is higher than the fan temperature, the motor is independently cooled, the engine works in the large circulation mode, and the fan works.
Further, when the temperature of the engine coolant is not greater than the lowest temperature of the coolant at the time of engine start, determining whether the motor preheats the engine and the fan is operated, includes:
judging whether the temperature of the motor is higher than the temperature of the engine coolant when the hybrid vehicle is in a hybrid running mode, or judging whether the residual electric quantity of the current battery is higher than the minimum electric quantity required by the motor for preheating the engine when the hybrid vehicle is in a pure electric running mode;
when the temperature of the motor is greater than or equal to the temperature of the engine coolant, the motor preheats the engine, and the fan does not work; or when the temperature of the motor is lower than the temperature of the engine coolant, the motor is independently cooled, the engine is in a small-cycle working mode, and the fan does not work;
when the residual electric quantity of the current battery is larger than or equal to the minimum electric quantity required by the motor for preheating the engine, the motor preheats the engine, and the fan does not work, or when the residual electric quantity of the current battery is smaller than the minimum electric quantity required by the motor for preheating the engine, the motor independently cools and the fan does not work.
Further, determining that the running mode of the hybrid vehicle is the pure electric running mode or the hybrid running mode according to the comparison result includes:
when the residual electric quantity of the current battery is larger than or equal to the lowest residual electric quantity of the hybrid electric vehicle in the pure electric driving mode, determining that the hybrid electric vehicle is in the pure electric driving mode;
and when the residual capacity of the current battery is less than the lowest residual capacity of the hybrid vehicle in the pure electric driving mode, determining that the hybrid vehicle is in the hybrid driving mode.
Further, the lowest residual capacity of the hybrid electric vehicle in the pure electric running mode is 10-20%;
the minimum temperature of the cooling liquid is 70-80 ℃ when the engine is started.
The invention also provides a control system for a thermal management system of a hybrid vehicle, comprising:
an engine;
a motor;
the electric quantity collector is used for detecting the residual electric quantity of the current battery of the hybrid vehicle;
the temperature collector is used for collecting the temperature of the engine coolant of the hybrid vehicle;
a comparator for comparing the current remaining capacity of the battery with the lowest remaining capacity of the hybrid vehicle in an electric-only driving mode, and/or for comparing the engine coolant temperature with the lowest coolant temperature at the time of engine start; and
and the controller is connected with the comparator and used for determining the running mode of the hybrid vehicle according to the comparison result of the current battery residual capacity and the lowest residual capacity in the pure electric running mode and/or controlling whether the motor preheats or cools the engine and controls whether the fan works or not according to the comparison result of the temperature of the engine coolant and the lowest temperature of the coolant when the engine is started.
Further, the comparator is configured to compare the temperature of the motor with a lowest temperature at which the engine is in a large-cycle operation and the temperature of the fan, respectively;
the controller is configured to control whether the motor is independently cooled, whether the engine is in a large-cycle operation mode or a small-cycle operation mode or a cooling mode in series with the motor, and whether the fan is operated, according to a comparison result between the temperature of the motor and the lowest temperature when the engine is in the large-cycle operation and the temperature of the fan, respectively.
Further, the comparator is also configured to compare the current remaining capacity of the battery with a minimum capacity required for the motor to warm up the engine;
the controller is further configured to control the motor to cool independently, the engine to be in a small-cycle operation mode, and the fan to be inactive as a result of a comparison of the current remaining capacity of the battery with a minimum capacity required for the motor to warm up the engine.
Further, the comparator is further configured to compare the motor temperature with the temperature of the engine coolant when the hybrid vehicle is in a hybrid travel mode;
the controller is further configured to control whether the motor warms up the engine and whether the fan operates as a result of the comparison of the motor temperature and the engine coolant temperature.
The beneficial effects of the invention can be as follows:
firstly, the control method for the hybrid vehicle thermal management system compares the current residual capacity of the battery of the hybrid vehicle with the lowest residual capacity of the hybrid vehicle in the pure electric driving mode to determine the driving mode of the hybrid vehicle according to the comparison result, then judges whether the temperature of the engine coolant is higher than the lowest temperature of the coolant when the engine is started, and finally determines whether the motor preheats the engine and the fan works when the temperature of the engine coolant is lower than or equal to the lowest temperature of the coolant when the engine is started, or determines whether the motor cools the engine and the fan does not work when the engine coolant is higher than the lowest temperature of the coolant when the engine is started and the hybrid vehicle is in the pure electric driving mode, or determines whether the motor cools the engine and determines whether the fan works when the temperature of the engine coolant is higher than the lowest temperature of the coolant when the engine is started and the hybrid vehicle is in the hybrid driving mode Do this. Therefore, the control method can set the temperature gradient by combining the starting conditions of the motor and the fan under the condition that the hybrid vehicle is in different driving modes so as to refine the temperature control, thereby improving the cooling efficiency of the thermal management system of the hybrid vehicle and reducing the energy consumption of the hybrid power system of the vehicle. Therefore, the problem that the cooling efficiency of the thermal management system of the hybrid vehicle is low due to the fact that the temperature of the engine cannot be rapidly increased by the control method of the thermal management system in the prior art is solved.
The control method or the control system of the invention also comprises the steps of comparing the temperature of the motor with the lowest temperature and the temperature of the fan when the engine works in a large circulation mode respectively, so as to judge whether the motor is independently cooled, whether the engine works in the large circulation mode or the small circulation mode or the cooling mode connected with the motor in series and whether the fan works according to the comparison result respectively, thereby enabling the thermal management system of the hybrid vehicle to be cooled in different working modes. That is, the control method of the invention combines the motor, the engine large and small circulation and the fan starting condition to set the temperature gradient, so as to further refine the temperature control method, and further improve the cooling efficiency of the thermal management system, thereby further reducing the energy consumption of the vehicle hybrid power system.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a schematic flow chart diagram of a control method for a hybrid vehicle thermal management system according to one embodiment of the present invention;
FIG. 2 is a schematic flow chart diagram for one embodiment of step S400 in FIG. 1;
FIG. 3 is a schematic flow chart of step S403 in FIG. 2;
FIG. 4 is a schematic flow chart diagram of another embodiment of step S400 in FIG. 1;
FIG. 5 is a schematic flow chart diagram of a control method for the thermal management system of the hybrid vehicle of FIG. 1 in accordance with one embodiment of the present invention;
FIG. 6 is a block schematic diagram of a control system for a hybrid vehicle thermal management system, according to one embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic flow chart of a control method for a thermal management system of a hybrid vehicle according to an embodiment of the present invention, so as to solve the problem that the cooling efficiency of the thermal management system of the hybrid vehicle is low due to the fact that the control method of the thermal management system in the prior art cannot rapidly raise the engine temperature. The control method for the hybrid vehicle thermal management system comprises the following steps:
s100, comparing the residual electric quantity of the current battery of the hybrid vehicle with the lowest residual electric quantity of the hybrid vehicle in the pure electric driving mode;
s200, determining that the running mode of the hybrid vehicle is a pure electric running mode or a hybrid running mode according to the comparison result;
s300, judging whether the temperature of the engine cooling liquid of the hybrid vehicle is higher than the lowest temperature of the cooling liquid when the engine is started;
s400, when the temperature of the cooling liquid of the engine is not higher than the lowest temperature of the cooling liquid when the engine is started, determining whether the motor preheats the engine and determining whether a fan works; or
When the temperature of the engine coolant is greater than the minimum temperature of the coolant at the time of engine start, the hybrid vehicle determines that the motor is independently cooled and the fan is not operated in the electric-only running mode (mode 2), or the hybrid vehicle determines whether the motor cools the engine and determines whether the fan is operated in the hybrid running mode.
According to the control method for the hybrid vehicle thermal management system, the residual electric quantity of the current battery of the hybrid vehicle is compared with the lowest residual electric quantity of the hybrid vehicle in the pure electric driving mode to determine the driving mode of the hybrid vehicle according to the comparison result, then whether the temperature of the engine coolant is higher than the lowest temperature of the coolant when the engine is started is judged, and finally whether the motor preheats the engine and the fan works is determined when the temperature of the engine coolant is lower than or equal to the lowest temperature of the coolant when the engine is started, or whether the motor independently cools and the fan does not work is determined when the temperature of the engine coolant is higher than the lowest temperature of the coolant when the engine is started and the hybrid vehicle is in the pure electric driving mode, or when the temperature of the engine coolant is higher than the lowest temperature of the coolant when the engine is started, The hybrid vehicle is in a hybrid driving mode to determine whether the motor cools the engine and to determine whether the fan is operated. Therefore, the control method can set the temperature gradient by combining the starting conditions of the motor and the fan under the condition that the hybrid vehicle is in different driving modes so as to refine the temperature control, thereby improving the cooling efficiency of the thermal management system of the hybrid vehicle and reducing the energy consumption of the hybrid power system of the vehicle. Therefore, the problem that the cooling efficiency of the thermal management system of the hybrid vehicle is low due to the fact that the temperature of the engine cannot be rapidly increased by the control method of the thermal management system in the prior art is solved.
In the above embodiment, the step S200 of determining whether the driving mode of the hybrid vehicle is the electric-only driving mode or the hybrid driving mode according to the comparison result may include:
when the residual electric quantity of the current battery is larger than or equal to the lowest residual electric quantity of the hybrid vehicle in the pure electric driving mode, determining that the hybrid vehicle is in the pure electric driving mode;
and when the current residual capacity of the battery is less than the lowest residual capacity of the hybrid vehicle in the pure electric driving mode, determining that the hybrid vehicle is in the hybrid driving mode.
In the above-described embodiment, as shown in fig. 2, the hybrid vehicle determining whether the motor cools the engine and the fan is operated in the hybrid driving mode when the temperature of the engine coolant is greater than the minimum temperature of the coolant at the time of engine start in step S400 includes:
s401, judging whether the temperature of the motor is higher than the lowest temperature of the engine in large-cycle work or not;
s402, judging whether the temperature of the motor is higher than that of the fan or not;
s403, determining whether the motor is independently cooled, whether the engine is in a large-cycle working mode or a small-cycle working mode or a cooling mode connected with the motor in series and determining whether the fan works according to the judgment results of the temperature of the motor, the lowest temperature of the engine in the large-cycle working and the temperature of the fan.
In the above further embodiment, as shown in fig. 3, the determining, in step S403, whether the motor is independently cooled, the engine is in the large-cycle operation mode or the small-cycle operation mode or the cooling mode connected in series with the motor, and the fan is operated according to the determination results of the temperature of the motor and the minimum temperature of the engine in the large-cycle operation and the temperature of the fan respectively, may include:
if the temperature of the motor is less than or equal to the lowest temperature of the engine in the large-cycle working state and the temperature of the motor is less than or equal to the temperature of the fan, the motor is independently cooled, the engine is in a small-cycle working mode, and the fan does not work (mode 4). If the temperature of the motor is less than or equal to the lowest temperature of the engine in the large-cycle working state and the temperature of the motor is greater than the temperature of the fan, the motor is independently cooled, the engine is in a small-cycle working mode, and the fan does not work (mode 3). If the temperature of the motor is higher than the lowest temperature of the engine in the large-cycle working process and the temperature of the motor is lower than or equal to the temperature of the fan, the motor and the engine are connected in series for cooling, and the fan does not work (mode 5). If the temperature of the motor is higher than the lowest temperature of the engine in the large-cycle working and the temperature of the motor is higher than the temperature of the fan, the motor is independently cooled, and the engine is in the large-cycle working mode and the fan works (mode 6).
In a further embodiment, as shown in fig. 4, the determining whether the motor warms up the engine and the fan operates when the temperature of the engine coolant is not greater than the minimum temperature of the coolant at the time of engine start in step S400 may include:
s410, judging whether the temperature of a motor is higher than the temperature of cooling liquid of an engine when the hybrid vehicle is in a hybrid running mode, or judging whether the residual electric quantity of a current battery is higher than the minimum electric quantity required by the motor for preheating the engine when the hybrid vehicle is in a pure electric running mode;
s420, when the temperature of the motor is larger than or equal to the temperature of the engine coolant, the motor preheats the engine, and the fan does not work (mode 1); or when the temperature of the motor is lower than the temperature of the engine coolant, the motor is independently cooled, the engine is in a small-cycle working mode, and the fan does not work (mode 3);
and S430, when the residual electric quantity of the current battery is larger than or equal to the minimum electric quantity required by the motor to preheat the engine, the motor preheats the engine and the fan does not work (mode 1), or when the residual electric quantity of the current battery is smaller than the minimum electric quantity required by the motor to preheat the engine, the motor is independently cooled and the fan does not work (mode 2).
The control method of the thermal management system in the embodiment can be divided into six working modes according to the large circulation of the engine, the small circulation of the engine, and whether the motor and the fan work. That is, mode 1 is where the motor warms up the engine and the fan is not operating. Mode 2 is that the motor cools independently, and the fan is not worked. And in the mode 3, the motor is independently cooled, the engine is in small circulation, and the fan does not work. Mode 4 is that the motor cools down independently, and the engine is the microcirculation, and the fan is out of operation. And in the mode 5, the engine and the motor are cooled in series, and the fan does not work. And in the mode 6, the motor is independently cooled, the engine is in large circulation, and the fan works.
When the hybrid vehicle starts to work in the mode 1, the engine which does not reach the proper working temperature can be quickly heated under the preheating of the motor, so that the engine can quickly enter the proper temperature range to work after working, and the working efficiency of the engine is improved. When the hybrid vehicle is operating in mode 3, the engine is operating with a small circulation flow. When the hybrid vehicle is operating in mode 6, the engine is operated in a flow through large cycle mode so that the engine can be rapidly warmed up and rapidly brought into operation within the optimum temperature range. When the hybrid vehicle works in the mode 1, the mode 2, the mode 4 and the mode 5 respectively, the fan does not work, the circulation of cooling liquid and the flowing of air in the hybrid vehicle are slow, the whole vehicle can work in a proper temperature range, and therefore the starting energy consumption of the fan can be saved. When the hybrid vehicle works in the mode 3 and the mode 6 respectively, the fan starts to work, the flow of air is accelerated, and therefore the temperature of parts such as an engine, a motor and the like can be rapidly reduced, and the temperature of the whole vehicle can be rapidly reduced to be in a proper working temperature range. That is, the control method of this embodiment further includes comparing the temperature of the motor with the lowest temperature when the engine is in the large-cycle operation and the temperature of the fan, so as to determine whether the motor is independently cooled, whether the engine is in the large-cycle operation mode or the small-cycle operation mode or the cooling mode connected in series with the motor, and whether the fan is operated according to the comparison result, so that the thermal management system of the hybrid vehicle can be cooled in different operation modes. That is to say, the control method of the embodiment combines the large and small cycles of the motor and the engine and the starting condition of the fan to set the temperature gradient, so as to further refine the temperature control method, and further improve the cooling efficiency of the thermal management system, thereby further reducing the energy consumption of the vehicle hybrid power system.
In any of the above embodiments, the lowest remaining capacity of the hybrid vehicle in the electric-only driving mode may be 10-20% of the remaining capacity. The minimum temperature of the cooling liquid when the engine is started can be 70-80 ℃, or can be 75-80 ℃. The minimum electric quantity required by the motor to preheat the engine can be obtained by calculating according to the equivalent of the power of the motor and the estimated power consumption of the engine, and has no determined value. The lowest temperature of the engine in the large-cycle working can be 85-100 ℃, or 92-95 ℃.
The present embodiment also provides a control system for a thermal management system of a hybrid vehicle, and as shown in fig. 6, the control system may include an engine 1, a motor 2, a power collector 3 for detecting a current remaining power of a battery 7 of the hybrid vehicle, a temperature collector 4 for collecting a temperature of engine coolant of the hybrid vehicle, a comparator 5, and a controller 6. The comparator 5 is configured to compare the current remaining capacity of the battery 7 with the lowest remaining capacity of the hybrid vehicle in the electric-only driving mode, and/or compare the engine coolant temperature with the lowest coolant temperature at the time of engine start. The controller 6 is connected with the comparator 5 and is used for determining the running mode of the hybrid vehicle according to the comparison result of the current residual capacity of the battery 7 and the lowest residual capacity in the pure electric running mode and/or controlling whether the motor 2 preheats or cools the engine 1 and whether the fan works according to the comparison result of the temperature of the engine coolant and the lowest temperature of the coolant when the engine is started. The temperature collector 4 may also be configured to collect a temperature of the motor 2 or a temperature of the fan, and send collected temperature information to the comparator 5.
In the above embodiment, the comparator 5 may be configured to compare the temperature of the motor 2 with the lowest temperature when the engine 1 is in the large-cycle operation, and the temperature of the fan, respectively. The controller may be configured to control whether the motor 2 is independently cooled, whether the engine 1 is in the large-cycle operation mode or the small-cycle operation mode or in the cooling mode in series with the motor, and whether the fan is operated, according to a result of comparing the temperature of the motor 2 with a lowest temperature of the engine 1 when the engine is in the large-cycle operation and the temperature of the fan, respectively.
In the above-described further embodiment, the comparator 5 may be further configured to compare the current remaining amount of the battery 7 with the minimum amount of electricity required for the motor 2 to warm up the engine 1. The controller 6 may be further configured to control the motor to cool independently, the engine to be in a small-cycle operation mode, and the fan to be off as a result of comparing the remaining amount of power of the battery 7 with the minimum amount of power required for the motor 2 to warm up the engine 1.
In a further embodiment, the comparator 5 may also be configured to compare the motor temperature with the temperature of the engine coolant when the hybrid vehicle is in the hybrid drive mode. The controller 6 may also be configured to control whether the motor warms up the engine and whether the fan is operating as a result of the comparison of the motor temperature and the engine coolant temperature.
The control system of the embodiment comprises the steps of comparing the temperature of the motor 2 with the lowest temperature and the temperature of the fan when the engine 1 works in the large circulation mode respectively, so as to judge whether the motor 2 is independently cooled, whether the engine 1 works in the large circulation mode or the small circulation mode or the cooling mode connected with the motor 2 in series and whether the fan works according to the comparison result respectively, and therefore the thermal management system of the hybrid vehicle can be cooled in different working modes. That is to say, the control system of the embodiment sets the temperature gradient by combining the large and small cycles of the motor and the engine and the starting condition of the fan at the same time, so as to further refine the temperature control method, and achieve the purpose of further improving the cooling efficiency of the thermal management system, thereby further reducing the energy consumption of the vehicle hybrid power system.
In a specific embodiment, as shown in fig. 5, after the hybrid vehicle is started, the VCU (which can collect the battery power by the power collector 3) of the vehicle can read the current power SOC (State of Charge) of the battery, and when the SOC is greater than or equal to the minimum battery SOC (minimum remaining power) for electric vehicle driving, the vehicle drives in an electric vehicle EV (electric vehicle) mode. When the SOC is less than the pure electric driving minimum electric quantity SOC pure electric min, the Vehicle is driven in a Hybrid Electric Vehicle (HEV) mode.
When the vehicle is running in the EV mode, the entire vehicle VCU (whose temperature of the engine coolant can be collected by the temperature collector 4) reads the coolant temperature TEngine(Engine coolant temperature) at TEngineMinimum temperature T at start of engineEngine Start min(minimum temperature of cooling liquid when engine is started), VCU continuously judges whether current vehicle electric quantity SOC is larger than or equal to minimum electric quantity SOC required by motor 2 for preheating engine 1PreheatingWhen SOC is more than or equal to SOCPreheatingWhen the operation mode is started, the operation mode 1 is started; when SOC < SOCPreheatingWhen so, the operation mode 2 is turned on. When T isEngineMinimum temperature T at engine startEngine Start minWhen so, the operation mode 2 is turned on.
When the vehicle is running in the HEV mode, the VCU of the whole vehicle reads the temperature T of the cooling liquidEngineWhen T isEngineMinimum temperature T at start of engineEngine Start minThen, VCU continuously judges the current motor temperature TElectric machineWhether or not the temperature T of the engine is greater than or equal toEngineWhen T isElectric machine≥TEngineWhen the operation mode is started, the operation mode 1 is started; when T isElectric machine＜TEngineWhen so, the operation mode 3 is turned on. When T isEngineMinimum temperature T at engine startEngine Start minThen, VCU continuously judges the current motor temperature TElectric machineWhether the minimum temperature T is less than or equal to the maximum circulation temperature T of the engineMajor circulationWhen T isElectric machine≤TMajor circulationThen, VCU continuously judges the current motor temperature TElectric machineWhether or not the fan opening temperature T is less than or equal toFan with cooling deviceWhen T isElectric machine≤TFan with cooling deviceWhen the operation mode 4 is started; when T isElectric machine＞TFan with cooling deviceWhen so, the operation mode 3 is turned on. When T isElectric machine＞TMajor circulationThen, VCU continuously judges the current motor temperature TElectric machineWhether or not > Fan Start temperature TFan with cooling deviceWhen T isElectric machine≤TFan with cooling deviceWhen the operation mode 5 is started; when T isElectric machine＞TFan with cooling deviceWhen so, the operating mode 6 is turned on.
Therefore, the control system or the control method of any embodiment can simultaneously combine the motor, the engine large and small cycles and the starting condition of the fan to set the temperature gradient so as to further refine the temperature control method, so as to achieve the purpose of further improving the cooling efficiency of the thermal management system, and further reduce the energy consumption of the vehicle hybrid power system.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims (8)

1. A control method for a hybrid vehicle thermal management system, comprising:
comparing the residual capacity of the current battery of the hybrid electric vehicle with the lowest residual capacity of the hybrid electric vehicle in the pure electric driving mode;
determining that the running mode of the hybrid vehicle is a pure electric running mode or a hybrid running mode according to the comparison result;
judging whether the temperature of the engine coolant of the hybrid vehicle is higher than the lowest temperature of the coolant when the engine is started;
when the temperature of the engine coolant is not higher than the lowest temperature of the coolant when the engine is started, determining whether the motor preheats the engine and determining whether the fan works;
when the temperature of the engine coolant is higher than the lowest temperature of the coolant when the engine is started, the hybrid vehicle determines that the motor is independently cooled and the fan does not work in the pure electric driving mode, or determines whether the motor cools the engine and determines whether the fan works in the hybrid driving mode;
wherein the hybrid vehicle determines whether the motor cools the engine and the fan is operated in the hybrid driving mode when the temperature of the engine coolant is greater than the lowest temperature of the coolant at the time of engine start, including:
judging whether the temperature of the motor is higher than the lowest temperature of the engine in the large-cycle working;
judging whether the temperature of the motor is higher than that of the fan or not;
and determining whether the motor is independently cooled, whether the engine is in a large-cycle working mode or a small-cycle working mode or a cooling mode connected with the motor in series and determining whether the fan works according to the judgment results of the temperature of the motor, the lowest temperature of the engine in the large-cycle working and the temperature of the fan.
2. The control method according to claim 1, wherein the determining whether the motor is independently cooled, the engine is in a large-cycle operation mode or a small-cycle operation mode or a cooling mode in series with the motor, and the fan is operated, based on the determination results of the temperature of the motor and the lowest temperature of the engine in the large-cycle operation and the temperature of the fan, respectively, comprises:
if the temperature of the motor is less than or equal to the lowest temperature of the engine in the large-cycle working state and the temperature of the motor is less than or equal to the temperature of the fan, the motor is independently cooled, the engine is in a small-cycle working mode, and the fan does not work;
if the temperature of the motor is less than or equal to the lowest temperature of the engine in the large-cycle working state and the temperature of the motor is greater than the temperature of the fan, the motor is independently cooled, the engine is in a small-cycle working mode, and the fan does not work;
if the temperature of the motor is higher than the lowest temperature of the engine in the large-cycle working state and the temperature of the motor is lower than or equal to the temperature of the fan, the motor and the engine are connected in series for cooling, and the fan does not work;
if the temperature of the motor is higher than the lowest temperature of the engine in the large-cycle working process and the temperature of the motor is higher than the temperature of the fan, the motor is independently cooled, the engine is in a large-cycle working mode, and the fan works.
3. The control method according to any one of claims 1-2, wherein the determining whether the motor warms up the engine and the fan operates when the temperature of the engine coolant is not more than a minimum temperature of the coolant at the time of engine start includes:
judging whether the temperature of the motor is higher than the temperature of the engine coolant when the hybrid vehicle is in a hybrid running mode, or judging whether the residual electric quantity of the current battery is higher than the minimum electric quantity required by the motor for preheating the engine when the hybrid vehicle is in a pure electric running mode;
when the temperature of the motor is greater than or equal to the temperature of the engine coolant, the motor preheats the engine, and the fan does not work; or when the temperature of the motor is lower than the temperature of the engine coolant, the motor is independently cooled, the engine is in a small-cycle working mode, and the fan does not work;
when the residual electric quantity of the current battery is larger than or equal to the minimum electric quantity required by the motor for preheating the engine, the motor preheats the engine, and the fan does not work, or when the residual electric quantity of the current battery is smaller than the minimum electric quantity required by the motor for preheating the engine, the motor independently cools and the fan does not work.
4. The control method according to claim 3, wherein the determining that the travel mode of the hybrid vehicle is the electric-only travel mode or the hybrid travel mode according to the result of the comparison includes:
when the residual electric quantity of the current battery is larger than or equal to the lowest residual electric quantity of the hybrid electric vehicle in the pure electric driving mode, determining that the hybrid electric vehicle is in the pure electric driving mode;
and when the residual capacity of the current battery is less than the lowest residual capacity of the hybrid vehicle in the pure electric driving mode, determining that the hybrid vehicle is in the hybrid driving mode.
5. The control method according to claim 1,
the lowest residual electric quantity of the hybrid electric vehicle in the pure electric driving mode is 10-20%;
the minimum temperature of the cooling liquid is 70-80 ℃ when the engine is started.
6. A control system for a hybrid vehicle thermal management system, comprising:
an engine;
a motor;
the electric quantity collector is used for detecting the residual electric quantity of the current battery of the hybrid vehicle;
the temperature collector is used for collecting the temperature of the engine coolant of the hybrid vehicle;
a comparator for comparing the current remaining capacity of the battery with the lowest remaining capacity of the hybrid vehicle in an electric-only driving mode, and/or for comparing the engine coolant temperature with the lowest coolant temperature at the time of engine start; and
the controller is connected with the comparator and used for determining a running mode of the hybrid vehicle according to a comparison result of the current battery residual capacity and the lowest residual capacity in a pure electric running mode and/or controlling whether the motor preheats or cools the engine and whether the fan works or not according to a comparison result of the temperature of the engine coolant and the lowest temperature of the coolant when the engine is started;
wherein the comparator is configured to compare the temperature of the motor with a lowest temperature at which the engine is in a large-cycle operation and a temperature of the fan, respectively;
the controller is configured to control whether the motor is independently cooled, whether the engine is in a large-cycle operation mode or a small-cycle operation mode or a cooling mode in series with the motor, and whether the fan is operated, according to a comparison result between the temperature of the motor and the lowest temperature when the engine is in the large-cycle operation and the temperature of the fan, respectively.
7. The control system of claim 6,
the comparator is further configured to compare the current remaining capacity of the battery with a minimum capacity required for the motor to warm up the engine;
the controller is further configured to control the motor to cool independently, the engine to be in a small-cycle operation mode, and the fan to be inactive as a result of a comparison of the current remaining capacity of the battery with a minimum capacity required for the motor to warm up the engine.
8. The control system according to any one of claims 6 to 7,
the comparator is further configured to compare the motor temperature with the temperature of the engine coolant when the hybrid vehicle is in a hybrid travel mode;
the controller is further configured to control whether the motor warms up the engine and whether the fan operates as a result of the comparison of the motor temperature and the engine coolant temperature.
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CN113844431B (en) * 2021-09-29 2023-03-10 奇瑞汽车股份有限公司 Power system control method, device, equipment and medium of hybrid electric vehicle
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