CN114347747A - Electric automobile heat management control method - Google Patents
Electric automobile heat management control method Download PDFInfo
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- CN114347747A CN114347747A CN202111579516.2A CN202111579516A CN114347747A CN 114347747 A CN114347747 A CN 114347747A CN 202111579516 A CN202111579516 A CN 202111579516A CN 114347747 A CN114347747 A CN 114347747A
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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
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
- B60H1/00392—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for electric vehicles having only electric drive means
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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
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
-
- 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
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
- B60H1/00278—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit for the battery
-
- 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
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/615—Heating or keeping warm
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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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
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
- B60H2001/00307—Component temperature regulation using a liquid flow
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—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)
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention discloses a thermal management control method of an electric automobile, which is characterized by analyzing the temperature of an acquired battery pack, and analyzing and judging whether the battery pack needs to be heated or cooled or not by taking the average value of the highest temperature and the lowest temperature of a monomer in the acquired battery pack as the temperature of the battery pack; when the battery pack has a refrigeration request, performing refrigeration control by taking the highest temperature of a single battery pack as the temperature of the battery pack; when the battery pack has a heating request, the lowest temperature of the battery pack unit is used as the temperature of the battery pack to perform heating control. The invention has the advantages that: the management control is carried out on the heat management system of the electric automobile, so that the heat management system can accurately and reliably carry out heating or cooling and fault alarm logic can be realized; the method is suitable for controlling the thermal management system of the electric automobile, and improves the safety, the efficiency and the economy of the system.
Description
Technical Field
The invention relates to the field of electric automobile temperature control, in particular to a thermal management control method for an electric automobile.
Background
At present, an electric vehicle is regarded as an important way to solve energy crisis and environmental deterioration as a new energy vehicle with reduced oil consumption, low pollution and low noise. Like a conventional internal combustion engine vehicle, an electric vehicle also needs thermal management control. The energy-saving passenger cabin mainly comprises a passenger cabin, a driving system and an energy storage system. The electric automobile heat management system adopts air-conditioning refrigeration and water or air PTC heating modes to cool or heat the passenger compartment, the power battery, the motor inverter, the DCDC, the charger and the like, so that the safety, the high efficiency and the comfort of automobile operation are ensured. The control method of the automobile thermal management system in the prior art is not strong in pertinence, and accurate, reliable and complete control strategies for signal acquisition, signal control and output, fault analysis and judgment and the like do not exist, so that the thermal management system cannot effectively cool or heat the electric automobile, and user experience is influenced. A new electric vehicle heat management method is designed based on the application, and a more accurate, reliable and effective electric vehicle heat management method is realized through signal acquisition and processing, output control, fault analysis and the like.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a control method of a thermal management system of an electric automobile, which manages and controls the thermal management system of the electric automobile, realizes accurate and reliable heating or cooling of the thermal management system and can realize fault alarm logic.
In order to achieve the purpose, the invention adopts the technical scheme that: a control method of a thermal management system of an electric vehicle analyzes the collected temperature of a battery pack, and analyzes and judges whether the battery pack needs to be heated or cooled or not by taking the average value of the highest temperature and the lowest temperature of a monomer in the collected battery pack as the temperature of the battery pack; when the battery pack has a refrigeration request, performing refrigeration control by taking the highest temperature of a single battery pack as the temperature of the battery pack; when the battery pack has a heating request, the lowest temperature of the battery pack unit is used as the temperature of the battery pack to perform heating control.
The defrosting, defogging and heating request signal is analyzed, and when a defrosting, defogging and heating request exists in the passenger compartment and the PTC enables, the defrosting, defogging and heating request is output.
When the ACPTC power reaches a maximum and the PTC has an enable request, the output PTC reaches maximum power.
Analyzing and controlling the temperature of the driving system: when the signal of the temperature sensor in the electric drive system is effective, outputting the temperature values of the temperature sensors corresponding to the DCDC, the OBC, the motor inverter and the motor as corresponding temperatures, and otherwise, performing cooling and heating control by taking the preset standard temperature as the corresponding temperature; and during the refrigeration and heating control, controlling the water pump of the thermal management system corresponding to the electric drive system part, respectively converting the obtained temperatures corresponding to the DCDC, the OBC, the motor inverter and the motor into corresponding control duty ratios, and controlling the water pump of the electric drive system by the maximum control duty ratio.
The temperature of the electric drive system is monitored in real time, and when the DCDC temperature is higher than the DCDC alarm temperature, or the OBC temperature is higher than the OBC alarm temperature, or the motor inverter over-temperature alarm is a fault, or the motor over-temperature alarm is a fault, or the battery pack temperature is higher than the battery pack alarm temperature, meets any one requirement and outputs a cooling system fault prompt after the set time lasts.
6. The control method of the thermal management system of the electric vehicle as claimed in claim 1 or 2, wherein: when the thermal management system works, fault detection is carried out on a water pump, an electronic expansion valve, a motor three-way valve and a temperature sensor in the thermal management system, and when a fault occurs, a corresponding fault alarm is output.
The control method further includes a cooling system enable control method:
(1) normally judging IGN voltage: acquiring and judging the IGN voltage, judging the IGN voltage to be normal when the IGN voltage is between the minimum working voltage and the maximum working voltage, and otherwise, judging the IGN voltage to be abnormal and/or outputting an abnormal alarm;
(2) and (3) controlling the water pump to enable: respectively carrying out enabling judgment control on the water pumps corresponding to the electric drive system, the PTC system and the battery system, and enabling the corresponding water pumps when preset conditions are met;
(3) electronic expansion valve enable control: when the IGN voltage is normal, the battery pack has a refrigeration request and the electronic expansion valve has no fault, outputting the enable of the electronic expansion valve; when the electronic expansion valve fails or the BMS has no refrigeration request or the power supply mode is in an OFF gear, the enabling of the electronic expansion valve is cancelled;
(4) enabling control of a motor three-way valve: when the IGN voltage is normal, the battery pack has a heating request PTC with an enabling request, the PTC request power is greater than the PTC starting power, and the motor three-way valve has no fault, outputting the enabling of the motor three-way valve; the motor three-way valve enable is cancelled when the motor three-way valve fails or there is no heat request from the battery pack and the PTC does not have an enable request and the PTC requested power is less than the PTC start power or the power mode is in the OFF range.
The method further includes a power mode process of outputting a normal power mode when the power mode is one of ON, CHARGE, SMTCHARGE. The power mode is changed from one of ON, CHARGE, SMTCHARGE to OFF, and TurnOFF is output.
The method further comprises a water pump control: when the first water pump is enabled and in a common power supply mode, outputting the sum of the maximum duty ratio of the cooling system and a compensation duty ratio obtained by table lookup through the external temperature, processing the sum by an AfterRun module controlled by TurnOFF, and outputting the sum as the control duty ratio of the first water pump after processing the sum by a 0-100 limit value; otherwise, outputting a first closing duty ratio (10, TBD) of the water pump.
When the system TurnOFF is in, the AfterRun module records the working duty ratio of each part of the current water circulation system and keeps the working state for working for a period of time. And when the normal power supply mode is detected, the normal working mode of the system is recovered, namely the duty ratio of each part is output according to the requirement.
The invention has the advantages that: the management control is carried out on the heat management system of the electric automobile, so that the heat management system can accurately and reliably carry out heating or cooling and fault alarm logic can be realized; the method is suitable for controlling the thermal management system of the electric automobile, and improves the safety, the efficiency and the economy of the system.
Drawings
The contents of the expressions in the various figures of the present specification and the labels in the figures are briefly described as follows:
FIG. 1 is a schematic diagram of the thermal management system of the present invention.
Detailed Description
The following description of preferred embodiments of the invention will be made in further detail with reference to the accompanying drawings.
1.1 external Signal processing
Temperature of the battery pack: when the cooling request exists in the battery pack, the highest temperature of the battery pack is used as the temperature of the battery pack. Otherwise, when the battery pack has a heating request, the lowest temperature of the battery pack is used as the temperature of the battery pack. Otherwise, the average value of the highest temperature and the lowest temperature of the battery pack is used as the temperature of the battery pack.
Defrosting and demisting heating requests: when the passenger compartment has a defrost defogging request and the PTC has an enable request, a defrost defogging heating request is output.
PTC to maximum power: when the ACPTC power reaches a maximum and the PTC has an enable request, the output PTC reaches maximum power.
1.2 Water Pump-maximum Duty ratio & Cooling System Fault
Water pump-maximum duty cycle & cooling system failure. And when the sensor signals corresponding to the DCDC, the OBC, the motor inverter and the motor are effective, outputting the temperature values of the DCDC, the OBC, the motor inverter and the motor sensor as corresponding temperatures, and otherwise, taking the standard temperature as the corresponding temperature.
And respectively looking up the acquired temperatures corresponding to the DCDC, the OBC, the motor inverter and the motor, and taking the maximum value to obtain the maximum control duty ratio of the water pump of the cooling system.
When the DCDC temperature is higher than the DCDC alarm temperature (85 ℃, TBD), or the OBC temperature is higher than the OBC alarm temperature (85 ℃, TBD), or the motor inverter over-temperature alarm is fault, or the motor over-temperature alarm is fault, or the battery pack temperature is higher than the battery pack alarm temperature (56 ℃, TBD), one of the DCDC temperature and the OBC temperature is satisfied and continues for a period of Time (the specific Time does not exist, namely, each Step _ Time performs T (initially 0) +4 operation when the current signal exists, disappears to perform-6 operation, and outputs the current fault when T is 48).
1.3 Cooling System Fault diagnosis & temperature pressure sensor
1.3.1 Fault diagnosis of Water Pump one, two, three
The following text is incorporated by reference for consistent diagnostic patterns.
And (4) performing fault diagnosis on the water pump, sequentially performing the following fault detection, outputting the current fault if the current fault state is detected to exist, and not performing subsequent detection.
And outputting the dry running fault of the water pump when the dry running fault of the water pump has a fault.
When the water pump over-temperature fault has a fault, and the fault lasts for a period of time (the water pump restart time: 60s), outputting the water pump over-temperature fault.
When the water pump voltage fault has a fault and lasts for a period of time (the water pump restart time: 60s), outputting the water pump voltage fault.
And when the water pump open-circuit fault has a fault, outputting the water pump open-circuit fault.
And when the low-rotation-speed fault of the water pump has a fault, and the fault lasts for a period of time (the restart time of the water pump: 60s), outputting the low-rotation-speed fault of the water pump.
Otherwise, the output water pump has no fault
And the fault diagnosis of the water pump II and the water pump III is the same as that of the water pump I.
1.3.2 electronic expansion valve fault diagnosis
And sequentially carrying out the following fault detection, and outputting the current fault if the current fault state is detected to exist, and not carrying out subsequent detection.
A coil short fault exists and persists for a period of time (5 s).
An open coil fault exists and persists for a period of time (5 s).
An over-temperature shutdown fault exists and continues for a period of time (5 s).
The stall fault exists and persists for a period of time (5 s).
Otherwise, the output electronic expansion valve has no fault.
1.3.3 Motor three-way valve fault diagnosis
And sequentially carrying out the following fault detection, and outputting the current fault if the current fault state is detected to exist, and not carrying out subsequent detection.
An overvoltage fault exists and persists for a period of time (5 s).
The low voltage fault exists and persists for a period of time (5 s).
An over-temperature fault exists and persists for a period of time (5 s).
An over-temperature shutdown fault exists and continues for a period of time (5 s).
An overcurrent fault exists and lasts for a period of time (5 s).
The stall fault exists and persists for a period of time (5 s).
An open fault exists and persists for a period of time (5 s).
The loss of communication fault exists and lasts for a period of time (5 s).
An out-of-range fault exists and persists for a period of time (5 s).
The target position inconsistency fault exists and lasts for a period of time (5 s).
Otherwise, the three-way valve of the output motor has no fault.
1.3.4 temperature and pressure sensor
9.3.4.1 pressure of warm pressure sensor
The temperature and pressure sensor is divided into two parts of temperature voltage and pressure voltage.
And detecting pressure and voltage faults of the temperature and pressure sensor. And when any fault exists, outputting a pressure voltage fault of the temperature and pressure sensor, otherwise, outputting no fault.
1) An out-of-range fault.
2) Short power/open fault, or short ground fault.
And (3) over-range fault: when the pressure voltage value of the temperature and pressure sensor is smaller than the minimum range (0.25V, TBD) or larger than the maximum range (4.75V, TBD) and lasts for a period of time, the pressure voltage over-range fault of the temperature and pressure sensor is output.
And (3) loop fault: and when the pressure value of the warm-pressure sensor is greater than the short-circuit/open-circuit voltage value (4.9V, TBD) and lasts for a period of time, outputting a short-circuit/open-circuit fault of the pressure value of the warm-pressure sensor, and when the pressure value of the warm-pressure sensor is less than the short-circuit voltage (0.1V, TBD) and lasts for a period of time, outputting a short-circuit fault of the pressure value of the warm-pressure sensor. Any fault exists, i.e., a circuit fault.
And calculating the pressure value of the temperature and pressure sensor. When the pressure and the voltage of the temperature and pressure sensor have no fault, the voltage value is converted into a pressure value through formula calculation, and the pressure value of the temperature and pressure sensor is output.
Vout＝(Vcc/100)*(0.57142*P/k+5)
Vcc: the power supply voltage has a value of 5V.
Vout: and the pressure voltage value of the temperature and pressure sensor.
P: and (5) a temperature and pressure sensor pressure value.
K: the unit conversion is 6.895.
9.3.4.1 temperature of warm-pressure sensor
Temperature and voltage sensor fault detection. And when any fault exists, outputting a temperature and voltage fault of the temperature and voltage sensor, or else outputting no fault.
1) An out-of-range fault.
2) Short power/open fault, or short ground fault.
And (3) over-range fault: when the temperature and voltage value of the temperature and pressure sensor is smaller than the minimum range (0.25V, TBD) or larger than the maximum range (4.75V, TBD) and lasts for a period of time, the temperature and voltage over-range fault of the temperature and pressure sensor is output.
And (3) loop fault: and outputting the temperature and voltage short circuit/open circuit fault of the temperature and voltage sensor when the temperature and voltage value of the temperature and voltage sensor is greater than the short circuit/open circuit voltage value (4.9V, TBD) and continues for a period of time, and outputting the temperature and voltage short circuit fault of the temperature and voltage sensor when the temperature and voltage value of the temperature and voltage sensor is less than the short circuit voltage (0.1V, TBD) and continues for a period of time. Any fault exists, i.e., a circuit fault.
And calculating the temperature value of the temperature and pressure sensor. When the temperature and voltage of the temperature and pressure sensor have no fault, the voltage value is converted into the resistance value of the temperature and pressure sensor through the following formula calculation, and the temperature value of the temperature and pressure sensor is output by looking up the table.
Vout＝Vcc/(R0+R)*R
Vcc: the power supply voltage has a value of 5V.
Vout: and the pressure voltage value of the temperature and pressure sensor.
R0：4.7Ω
R: resistance value of temperature and pressure sensor
R-T table:
R-T diagram of temperature and pressure sensor
1.4 Cooling System Enable control
1.4.1IGN Voltage Normal determination
And judging whether the IGN voltage is normal, wherein when the IGN voltage is between the minimum working voltage (8V, TBD) and the maximum working voltage (20V, TBD), the output voltage is normal, and otherwise, the output voltage is abnormal.
1.4.2 Water Pump one Enable control
Note that: the set signal trigger will continue to act, and the set can only be cancelled when the reset has a signal trigger, and the reset priority is higher than the set.
And controlling the first water pump to enable, setting when all the following conditions are met, and outputting the first water pump to enable.
1) The IGN voltage is normal.
2) The maximum duty cycle of the cooling system is more than or equal to a starting duty cycle (20, TBD) of the water pump.
3) The water pump has no fault.
When one of the following conditions is satisfied, the system is reset and the water pump is not enabled.
1) And (6) the first water pump fails.
2) The maximum cooling system duty cycle is equal to the pump-full-off duty cycle (10, TBD).
3) The power mode is in the OFF range.
1.4.3 Water Pump two Enable control
And controlling the second water pump to enable, setting when all the following conditions are met, and outputting the second water pump to enable.
1) The IGN voltage is normal.
2) There is a PTC enable request.
3) And the second water pump has no fault.
When one of the following conditions is met, resetting is carried out, and the second water pump is not enabled.
1) And (5) the water pump II fails.
2) There is no PTC enable request and the PTC outlet temperature is less than normal (20 ℃, TBD).
3) The power mode is in the OFF range.
1.4.4 Water Pump triple Enable control
And controlling the third enable of the water pump, setting when all the following conditions are met, and outputting the third enable of the water pump.
1) The IGN voltage is normal.
2) The battery pack is in a discharging state, or the battery pack is in a charging state, or the battery pack has a cooling request, or the battery pack has a heating request.
3) And the third water pump has no fault.
When one of the following conditions is met, resetting is carried out, and the third enabling of the water pump is cancelled.
1) And (5) the water pump has three faults.
2) The battery pack is not in a discharge state and the battery pack is not in a charge state, and there is no cooling request and no heating request for the battery pack.
3) The power mode is in the OFF range.
1.4.5 electronic expansion valve enable control
And (4) enabling the electronic expansion valve, setting when all the following conditions are met, and outputting the enable of the electronic expansion valve.
1) The IGN voltage is normal.
2) There is a cooling request for the battery pack.
3) The electronic expansion valve has no fault.
When one of the following conditions is satisfied, the electronic expansion valve is reset and disabled.
1) Failure of the electronic expansion valve.
2) The BMS does not have a cooling request.
3) The power mode is in the OFF range.
1.4.6 Motor three-way valve enable control
And controlling the enabling of the motor three-way valve, setting when all the following conditions are met, and outputting the enabling of the motor three-way valve.
1) The IGN voltage is normal.
2) There is a heat request for the battery pack, or the PTC has an enable request and the PTC requested power is greater than the PTC start power (0.1KW, TBD).
3) The motor three-way valve has no fault.
When one of the following conditions is satisfied, the reset is performed, and the enabling of the motor three-way valve is cancelled.
1) The motor three-way valve fails.
2) There is no heating request for the battery pack, and the PTC does not have an enable request and the PTC requested power is less than the PTC start power (0.05KW, TBD). .
3) The power mode is in the OFF range.
1.5 Cooling System control
1.5.1 Power mode processing
And (4) power mode processing. When the power mode is one of ON, CHARGE, SMTCHARGE, the normal power mode is output. The power mode is changed from one of ON, CHARGE, SMTCHARGE to OFF, and TurnOFF is output.
1.5.2 Water Pump control
And controlling the first water pump. When the first water pump is enabled and in a common power supply mode, the sum of the maximum duty ratio of the cooling system and the compensation duty ratio obtained by table lookup of the external temperature is output, processed by the AfterRun module controlled by TurnOFF, subjected to 0-100 limit value processing, and then output as the first water pump control duty ratio. Otherwise, outputting a first closing duty ratio (10, TBD) of the water pump. When the first control duty ratio of the water pump is larger than the turn-off duty ratio (10, TBD) of the water pump.
1.5.3 Water Pump two control
And controlling the water pump II. And when the second water pump is enabled and is in a normal power supply mode, outputting the sum of the duty ratio obtained by table lookup of the temperature of the PTC water outlet and the compensation duty ratio obtained by table lookup of the external temperature, processing the sum by an AfterRun module controlled by TurnOFF, and outputting the sum as the control duty ratio of the second water pump after 0-100 limit value processing. Otherwise, outputting the second water pump closing duty ratio (10, TBD). Three control of water pump
1.5.4 Water Pump triple control
And when the external temperature is greater than or equal to the summer and winter temperature boundary (15 ℃ and TBD), looking up the difference between the temperature of the battery pack and the summer target temperature (25 ℃ and TBD) of the battery pack to obtain the control duty ratio of the three battery packs of the water pump. And when the external temperature is less than the temperature boundary (15 ℃ and TBD) in summer and winter, looking up the difference between the temperature of the battery pack and the target temperature (30 ℃ and TBD) of the battery pack in winter to obtain the control duty ratio of the three battery packs of the water pump.
1) And when the battery pack has a refrigeration request, outputting the sum of the control duty ratio of the three battery packs of the water pump and the duty ratio obtained by looking up the table through the control duty ratio of the electronic expansion valve. Otherwise, the last duty cycle is output.
2) And when the battery pack has a heating request, outputting the control duty ratio of the second water pump. Otherwise, outputting the result of 1).
3) And when the battery pack is discharged or charged and the battery pack does not have heating and cooling requests, controlling the duty ratio of the water pump three battery packs to output. Otherwise, outputting the result of 2).
When the water pump is enabled three times and is in the common power mode to output 3), the result is processed by the AfterRun module controlled by TurnOFF, and is output as the three-control duty ratio of the water pump after being processed by the 0-100 limit value. Otherwise, outputting the three-off duty ratio (10, TBD) of the water pump.
1.5.5 electronic expansion valve control
Superheat degree of electronic expansion valve: the difference of the saturation temperature obtained by looking up the table of the temperature value of the temperature-pressure sensor and the pressure value of the temperature-pressure sensor
Request superheat degree of electronic expansion valve: difference between target superheat (20 ℃, TBD) of electronic expansion valve and superheat of electronic expansion valve
The P term regulates the output value: and the electronic expansion valve requests the superheat degree, which is obtained by looking up a table of the requested superheat degree, and the requested superheat degree of the electronic expansion valve is used as a P-term regulation output value.
Term I adjusts the output value: when the electronic expansion valve is controlled to be started, 0 is used as an I item adjustment output value, otherwise, B ki obtained by the electronic expansion valve requesting the superheat degree lookup table and B ki is used as the I item adjustment output value, and the I item adjustment output value at the last moment is used as the I item adjustment output value.
When the electronic expansion valve is enabled and in a normal power supply mode, the sum of the regulating output value of the P term and the regulating output value of the I term is output, processed by the AfterRun module controlled by TurnOFF, processed by the limit value of 0-480 and then output as the control duty ratio of the electronic expansion valve. Otherwise, outputting the closing duty ratio (0, TBD) of the electronic expansion valve. And when the control duty ratio of the electronic expansion valve is greater than the closing duty ratio (0, TBD) of the electronic expansion valve, outputting the control of the electronic expansion valve.
1.5.6 electric motor three-way valve control
The three-way valve battery pack controls the duty ratio: and multiplying the sum of the PTC power requested by the battery pack and the PTC power requested by the passenger compartment by the offset coefficient (1.2, TBD) of the battery pack and then by 100.
1) And when the battery pack has a heating requirement and a defrosting and demisting heating request exists, outputting the control duty ratio of the three-way valve battery pack by multiplying the passenger compartment offset coefficient (0.7, TBD). Otherwise, the last duty cycle is output.
2) When the battery pack has a heating demand and a PTC enabling request, the PTC power request is larger than a PTC opening value (0.1KW, TBD), and no defrosting and demisting heating request exists, outputting a three-way valve battery pack to control the duty ratio. Otherwise, outputting the result of 1)
3) The output three-way valve fully closes the duty cycle (0, TBD) when the following two conditions are satisfied. Otherwise, outputting the result of 2)
The battery pack has no heating requirement. ② there is a defrosting defogging heating request, or there is a PTC enable request and the PTC request power is greater than the PTC startup power (0.1KW, TBD). When the motor three-way valve is enabled (VePTMR _ e _ Normtr3 WVleeEnable) and in the normal power mode, the result of the 3 is output, the result is processed by the AfterRun module controlled by TurnOFF, and the processed result is used as the duty ratio output of the motor three-way valve after the 0-100 limit value processing is carried out. Otherwise, the closing duty ratio (0, TBD) of the three-way valve of the motor is output.
1.6AfterRun
When the system TurnOFF is in, the AfterRun module records the working duty ratio of each part of the current water circulation system and keeps the working state for working for a period of time. And when the normal power supply mode is detected, the normal working mode of the system is recovered, namely the duty ratio of each part is output according to the requirement.
Five beneficial effects
1. The control of the three water pumps, the electronic expansion valve and the motor three-way valve realizes regional system heat management, the VCU performs corresponding system distribution according to different heat management requirements of a passenger cabin, a power battery, a motor inverter, a DCDC (direct current), a charger and the like, and the safety, the efficiency and the economy of the system are improved
2. The heat management efficiency is improved by coordinating and controlling components such as a water pump, an electronic expansion valve, a motor three-way valve and the like.
3. The control method is based on MATLAB model development language editing and can be directly applied.
The key points and the protection points of the application are mainly as follows:
1. and controlling the three water pumps to perform regional system thermal management.
2. And controlling the electronic expansion valve to assist the water pump to perform regional system thermal management.
3. And controlling a three-way valve of the motor to assist the water pump to carry out regional system thermal management.
4. The AfterRun control is set, so that the system has two working modes and adopts different management methods.
5. The AfterRun control is suitable for different vehicle types and has wider application field.
6. The control method is based on MATLAB model development language editing and can be directly applied.
It is clear that the specific implementation of the invention is not restricted to the above-described embodiments, but that various insubstantial modifications of the inventive process concept and technical solutions are within the scope of protection of the invention.
Claims (10)
1. The electric automobile heat management control method is characterized by comprising the following steps: analyzing the collected temperature of the battery pack, and analyzing and judging whether the battery pack needs to be heated or cooled or not by taking the average value of the highest temperature and the lowest temperature of the monomer in the collected battery pack as the temperature of the battery pack; when the battery pack has a refrigeration request, performing refrigeration control by taking the highest temperature of a single battery pack as the temperature of the battery pack; when the battery pack has a heating request, the lowest temperature of the battery pack unit is used as the temperature of the battery pack to perform heating control.
2. The electric vehicle thermal management control method according to claim 1, characterized in that: the defrosting, defogging and heating request signal is analyzed, and when a defrosting, defogging and heating request exists in the passenger compartment and the PTC enables, the defrosting, defogging and heating request is output.
3. The electric vehicle thermal management control method according to claim 1 or 2, characterized in that: when the ACPTC power reaches a maximum and the PTC has an enable request, the output PTC reaches maximum power.
4. The electric vehicle thermal management control method according to claim 1, characterized in that: analyzing and controlling the temperature of the driving system: when the signal of the temperature sensor in the electric drive system is effective, outputting the temperature values of the temperature sensors corresponding to the DCDC, the OBC, the motor inverter and the motor as corresponding temperatures, and otherwise, performing cooling and heating control by taking the preset standard temperature as the corresponding temperature; and during the refrigeration and heating control, controlling the water pump of the thermal management system corresponding to the electric drive system part, respectively converting the obtained temperatures corresponding to the DCDC, the OBC, the motor inverter and the motor into corresponding control duty ratios, and controlling the water pump of the electric drive system by the maximum control duty ratio.
5. The electric vehicle thermal management control method according to claim 4, characterized in that: the temperature of the electric drive system is monitored in real time, and when the DCDC temperature is higher than the DCDC alarm temperature, or the OBC temperature is higher than the OBC alarm temperature, or the motor inverter over-temperature alarm is a fault, or the motor over-temperature alarm is a fault, or the battery pack temperature is higher than the battery pack alarm temperature, meets any one requirement and outputs a cooling system fault prompt after the set time lasts.
6. The electric vehicle thermal management control method according to claim 1 or 2, characterized in that: when the thermal management system works, fault detection is carried out on a water pump, an electronic expansion valve, a motor three-way valve and a temperature sensor in the thermal management system, and when a fault occurs, a corresponding fault alarm is output.
7. The electric vehicle thermal management control method according to claim 1 or 2, characterized in that: the control method further includes a cooling system enable control method:
(1) normally judging IGN voltage: acquiring and judging the IGN voltage, judging the IGN voltage to be normal when the IGN voltage is between the minimum working voltage and the maximum working voltage, and otherwise, judging the IGN voltage to be abnormal and/or outputting an abnormal alarm;
(2) and (3) controlling the water pump to enable: respectively carrying out enabling judgment control on the water pumps corresponding to the electric drive system, the PTC system and the battery system, and enabling the corresponding water pumps when preset conditions are met;
(3) electronic expansion valve enable control: when the IGN voltage is normal, the battery pack has a refrigeration request and the electronic expansion valve has no fault, outputting the enable of the electronic expansion valve; when the electronic expansion valve fails or the BMS has no refrigeration request or the power supply mode is in an OFF gear, the enabling of the electronic expansion valve is cancelled;
(4) enabling control of a motor three-way valve: when the IGN voltage is normal, the battery pack has a heating request PTC with an enabling request, the PTC request power is greater than the PTC starting power, and the motor three-way valve has no fault, outputting the enabling of the motor three-way valve; the motor three-way valve enable is cancelled when the motor three-way valve fails or there is no heat request from the battery pack and the PTC does not have an enable request and the PTC requested power is less than the PTC start power or the power mode is in the OFF range.
8. The electric vehicle thermal management control method according to claim 1 or 2, characterized in that: the method further includes a power mode process of outputting a normal power mode when the power mode is one of ON, CHARGE, SMTCHARGE. The power mode is changed from one of ON, CHARGE, SMTCHARGE to OFF, and TurnOFF is output.
9. The electric vehicle thermal management control method according to claim 1 or 2, characterized in that: the method further comprises a water pump control: when the first water pump is enabled and in a common power supply mode, outputting the sum of the maximum duty ratio of the cooling system and a compensation duty ratio obtained by table lookup through the external temperature, processing the sum by an AfterRun module controlled by TurnOFF, and outputting the sum as the control duty ratio of the first water pump after processing the sum by a 0-100 limit value; otherwise, outputting a first closing duty ratio (10, TBD) of the water pump.
10. The electric vehicle thermal management control method according to claim 1 or 2, characterized in that: when the system TurnOFF is in, the AfterRun module records the working duty ratio of each part of the current water circulation system and keeps the working state for working for a period of time. And when the normal power supply mode is detected, the normal working mode of the system is recovered, namely the duty ratio of each part is output according to the requirement.
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