CN113140811A - Water pump control system and control method of power battery thermal management system - Google Patents
Water pump control system and control method of power battery thermal management system Download PDFInfo
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- CN113140811A CN113140811A CN202110205933.4A CN202110205933A CN113140811A CN 113140811 A CN113140811 A CN 113140811A CN 202110205933 A CN202110205933 A CN 202110205933A CN 113140811 A CN113140811 A CN 113140811A
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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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
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
- H01M10/6567—Liquids
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to a water pump control system and a control method of a power battery thermal management system, which comprises a vehicle control unit, a battery management system, a water pump and a battery system, wherein the vehicle control unit is used for controlling the water pump; the battery management system is respectively connected with the vehicle control unit, the water pump and the battery system, and is used for receiving a target control signal F1 sent by the vehicle control unit and used for controlling the water pump and sending a target control signal F1 to the water pump; the battery management system monitors the state of the battery system in real time and sends detection data to the vehicle control unit; the vehicle control unit comprises a storage module, a calling module, a calculating module and an output module. The invention controls the variable speed regulation of the water pump through the vehicle control unit, thereby ensuring that the water pump runs in a high-efficiency area and the energy loss is minimum; ensuring that the battery operates in a reasonable temperature range.
Description
Technical Field
The invention relates to the technical field of new energy automobiles, in particular to a water pump control system and a control method of a power battery thermal management system.
Technical Field
The power battery is an energy source of the electric vehicle, and the cost, the performance and the service life of the power battery determine the cost and the reliability of the electric vehicle to a great extent. The temperature of the battery has great influence on the performance and the service life of the storage battery, so that the thermal management of the battery is made to have important practical significance for improving the maturity and the reliability of the power battery.
For example, chinese patent document No. CN201822186838.0 discloses a battery thermal management system, which includes a battery thermal management system and a motor thermal management system, where the battery thermal management system includes a battery water-cooling plate, a heater, a first water pump and a battery cooling water path, which are sequentially connected in series, the motor thermal management system includes a motor water jacket, a second water pump and a motor cooling water path, which are sequentially connected in series, the motor water jacket and the water pump are connected in series with the battery water-cooling plate, the heater and the first water pump through electromagnetic valves, and the motor cooling water path is connected in parallel with the battery cooling water path through electromagnetic valves.
The electric automobile power battery thermal management system adopted in the scheme utilizes a liquid medium mode for cooling, and drives cooling liquid to circularly flow in the battery system through the normal work of the water pump so as to control the temperature of the battery. However, the management and control of the water pump in the scheme are simple; the cooling liquid is only conveyed by the water pump, so that the efficient operation of the water pump cannot be ensured, and the resource waste is caused. In the battery thermal management system, the water pump is also particularly important, and if the water pump fails, the reliability and the safety of the thermal management system are greatly reduced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a water pump control system and a control method of a power battery thermal management system, which can ensure that a water pump runs in a high-efficiency area and the energy loss is minimum; the reliability and the safety of the battery thermal management system are effectively improved; ensuring that the battery operates within a reasonable temperature range.
The technical purpose of the invention is realized by the following technical scheme: a water pump control system of a power battery thermal management system comprises a vehicle control unit, a battery management system, a water pump and a battery system; the battery management system is respectively connected with the vehicle control unit, the water pump and the battery system, and is used for receiving a target control signal F1 sent by the vehicle control unit and used for controlling the water pump and sending the target control signal F1 to the water pump; the battery management system monitors the state of the battery system in real time and sends detection data to the vehicle control unit; the vehicle control unit comprises:
the storage module is used for storing a three-dimensional mapping table and a correction coefficient table, and the three-dimensional mapping table reflects the mapping relation among the battery temperature T1, the battery pack water inlet temperature T2 and the corresponding water pump control signal F; the correction coefficient table reflects the mapping relation between the battery temperature difference T3 and the corresponding correction coefficient A;
the adjusting module is used for adjusting the battery temperature T1 when the battery is heated or cooled, a water pump control signal F corresponding to the water inlet temperature T2 of the battery pack, and a correction coefficient A corresponding to the battery temperature difference T3 when the battery is heated or cooled;
the calculation module is used for calculating the product of the water pump control signal F and the correction coefficient A; namely the target control signal F1;
an output module for outputting the target control signal F1.
Thus, to control the operation of the water pump, the water pump is operated in a high efficiency zone. The scheme provides a water pump control system of a power battery heat management system, which comprises a vehicle control unit, a battery management system, a water pump and a battery system, wherein the vehicle control unit sends out a target control signal F1 to control the operation of the water pump. The vehicle control unit comprises a storage module, a calling module, a calculating module and an output module. In order to obtain the target control signal F1, the three-dimensional mapping table and the correction coefficient table under different working conditions (fast charging, slow charging, and vehicle heating) are obtained by continuously calibrating and correcting through thermal management simulation and high and low temperature experimental tests, and are stored in the storage module. The thermal management simulation and the high and low temperature experiments are the contents of the prior art, and are not described herein again. The three-dimensional mapping table reflects the mapping relation among the battery temperature T1, the battery pack water inlet temperature T2 and the water pump control signal F, and the correction coefficient table reflects the mapping relation between the battery temperature T3 and the correction coefficient A. In order to enable the battery to work in the optimal temperature range, the whole vehicle controller is preset with a low-temperature threshold and a high-temperature threshold of the battery. When the average temperature T4 of the battery is lower than a low temperature threshold value, the vehicle control unit heats the battery through a heating device; or when the average temperature T4 of the battery is higher than the high-temperature threshold, the vehicle control unit cools the battery through the cooling device. In the heating or cooling process of the battery, the water pump is required to drive the cooling liquid to circularly flow in the battery thermal management system. The heating device or the cooling device can realize effective heat dissipation, and the heating device or the cooling device is prevented from being broken down, so that the temperature of the battery can not be adjusted. The whole vehicle controller controls the heating device to heat the battery and the whole vehicle controller controls the cooling device to cool the battery, which is the content of the prior art and is not described herein again. The battery management system collects the temperature of the battery system in real time and transmits the temperature to the vehicle control unit in a communication mode. The battery system temperature comprises a battery highest temperature T11, a battery lowest temperature T12, a battery pack water inlet temperature T2, a battery temperature difference T3 and a battery average temperature T4. The temperature T2 of the water inlet of the battery pack is measured by a temperature sensor.
The battery pack is formed by connecting a plurality of battery modules in series and parallel, and the highest battery temperature T11 is the highest temperature among the plurality of battery modules in series; the battery minimum temperature T12 is the minimum temperature among the plurality of string modules. The cell temperature difference T3 is the difference between the cell maximum temperature T11 and the cell minimum temperature T12; the battery average temperature T4 is the average temperature of all the battery modules connected in series and parallel. And the vehicle control unit is connected with the heating device or the cooling device, and the vehicle control unit judges that the output power of the heating device is not 0, namely the battery is in a heating state. The calling module obtains the lowest temperature T11 of the battery and the temperature T2 of a water inlet of the battery pack, and calls out a three-dimensional mapping table under the current working condition. The three-dimensional mapping table has a mapping relation among a battery temperature T1, a battery pack water inlet temperature T2 and a water pump control signal F, and the vehicle controller obtains the corresponding water pump control signal F based on the battery minimum temperature T11 and the battery pack water inlet temperature T2; the lowest battery temperature T11 is the battery temperature T1 in the three-dimensional mapping table.
And when the vehicle control unit judges that the output power of the cooling device is not 0, namely the battery is in a cooling state. The calling module obtains the highest temperature T12 of the battery and the temperature T2 of a water inlet of the battery pack, and calls out a three-dimensional mapping table under the current working condition. And the vehicle control unit obtains a corresponding water pump control signal F based on the maximum battery temperature T12 and the water inlet temperature T2 of the battery pack. The maximum battery temperature T12 is the battery temperature T1 in the three-dimensional mapping table.
And the calling module calls out a correction coefficient table under the current working condition according to the acquired battery temperature difference T3. The correction coefficient table has a mapping relation between the battery temperature difference T3 and a correction coefficient A, and the correction coefficient A corresponding to the battery temperature difference T3 is obtained from the correction coefficient table. And the calculation module multiplies the water pump control signal F by the obtained correction coefficient A to obtain a target control signal F1. The output module outputs the target control signal F1. The battery management system receives the target control signal F1 and outputs the target control signal F1 to the water pump through a hard wire; the hard wire is a high-current circuit wire. The water pump adjusts its speed according to the target control signal F1. The reliability and the safety of the battery thermal management system are effectively improved, so that the battery system works in a reasonable temperature range and keeps good performance.
Preferably, the battery management system is further configured to receive an actual control signal F2 sent by the water pump, and send the actual control signal F2 to the vehicle control unit.
Therefore, the working state of the water pump after receiving the target control signal F1 is judged. The water pump sends the actual control signal F2 to the battery management system, and the actual control signal F2 is a feedback signal after the water pump receives the F1 and executes the F1; the battery management system transmits the F2 to the vehicle control unit; and the finished vehicle controller judges the F2 so as to judge the working state of the water pump.
Preferably, the vehicle control unit stores a state mapping table, and the state mapping table reflects a mapping relationship between the actual control signal F2 and the working state of the water pump.
Thereby reporting the operating state of the water pump. The vehicle control unit stores the state mapping table. The vehicle controller calls the working state of the water pump corresponding to the actual control signal F2 from the state mapping table according to the actual control signal F2; and the vehicle control unit reports the working state of the water pump.
Preferably, the water pump control signal F, the target control signal F1 and the actual control signal F2 are PWM duty signals.
Thereby, the rotational speed of the water pump is adjusted. The vehicle controller can send out the PWM duty cycle signal to adjust the PWM duty cycle signal; the PWM duty ratio signal is a network signal, and has the advantages of saving space and saving cost.
Preferably, the target control signal F1 and the water pump control relationship are as follows:
output F1: 0-20%, and stopping the water pump;
output F1: 20% -21%, and the water pump hysteresis loop;
output F1: 21% -80%, and the water pump adjusts the rotating speed;
output F1: more than 80%, the water pump rotates at full speed;
output F1: when the low level is connected, the water pump stops working;
output F1: when the water pump is connected with a high level or suspended, the water pump rotates at full speed.
Therefore, different working states of the water pump are controlled according to different F1 output by the vehicle control unit. The vehicle control unit is in communication connection with the battery management system, and sends out the F1; f1 is the PWM duty cycle signal. The battery management system is connected with the water pump and outputs the F1 to control the working state of the water pump. When the F1 output by the vehicle control unit is at a low level or 0-20%, the water pump stops working; when the output F1 is between 20% and 21%, the water pump is hysteresis; when the F1 is output to be 21-80%, the water pump adjusts the rotating speed of the water pump according to the received F1; when the output F1 is connected to high level or is suspended or is more than 80%, the water pump rotates at full speed. And controlling the adjustment of the working state of the water pump by outputting different F1.
Preferably, the vehicle control unit controls the target control signal F1 and the water pump power supply relay enable signal to be sent out simultaneously.
Thus, when the water pump detects that the F1 is hanging, it will run at full speed; the F1 is a network forwarding signal, and the synchronism of the closing enabling signal of the water pump low-voltage power supply relay and the F1 needs to be considered. In order to avoid the water pump idling or signal receiving error. The vehicle control unit optimizes the F1 trigger condition sent to the network, and ensures that IGN ON awakening is ignition awakening no matter the vehicle control unit is in a network awakening or IGN ON awakening state; and as long as the water pump power supply relay enables signals to be sent, the vehicle control unit controls the F1 to be sent out synchronously.
A water pump control method of an electric vehicle battery thermal management system uses the water pump control system of the power battery thermal management system, and the method specifically comprises the following steps:
s01, presetting a mapping table,
presetting the three-dimensional mapping table and the correction coefficient table in the vehicle control unit;
SO2, acquiring battery system data,
the battery management system acquires the battery system data and sends the battery system data to the vehicle control unit; the battery system data comprises a battery highest temperature T11, a battery lowest temperature T12, a battery pack water inlet temperature T2, a battery temperature difference T3 and a battery average temperature T4;
s03, a step of obtaining parameters in the mapping table,
the vehicle control unit respectively obtains the water pump control signal F and the correction coefficient A corresponding to the three-dimensional mapping table and the correction coefficient table based on the battery system data;
s04, calculating a water pump control signal,
the vehicle controller multiplies the water pump control signal F by the correction coefficient A to obtain a target control signal F1;
SO5, sending out a water pump control signal,
the vehicle control unit sends out the target control signal F1 for controlling the water pump to rotate;
s06, receiving a water pump control signal,
the battery management system receives the target control signal F1 and transmits the target control signal F1 to the water pump;
s07, controlling the water pump to adjust,
the water pump adjusts its operating state based on the target control signal F1.
Therefore, in order to improve the safety and reliability of the battery thermal management system, the water pump control system of the power battery thermal management system is applied, and the invention provides a water pump control method of the power battery thermal management system. The method comprises the following steps: and S01, continuously calibrating and correcting by an operator through thermal management simulation and high-low temperature experimental tests to obtain the three-dimensional mapping table and the correction coefficient table under different working conditions (fast charging, slow charging and vehicle heating), and inputting and storing the three-dimensional mapping table and the correction coefficient table in the vehicle control unit. S02, the battery management system detects the state of the battery system in real time and sends the detected temperature of the battery system to the vehicle control unit; the battery system temperature comprises a battery highest temperature T11, a battery lowest temperature T12, a battery pack water inlet temperature T2, a battery temperature difference T3 and a battery average temperature T4; s03, the vehicle control unit obtains the lowest temperature T11 of the battery and the temperature T2 of the water inlet of the battery pack when the battery is heated; and calling out the three-dimensional mapping table under the current working condition. The three-dimensional mapping table has a mapping relation among a battery temperature T1, a battery pack water inlet temperature T2 and a water pump control signal F, and the vehicle controller obtains the corresponding water pump control signal F based on the lowest battery temperature T11 and the battery pack water inlet temperature T2; the lowest battery temperature T11 is the battery temperature T1 in the three-dimensional mapping table. Similarly, the vehicle control unit obtains the highest battery temperature T12 and the water inlet temperature T2 when the battery is cooled, and obtains a corresponding water pump control signal F according to the three-dimensional mapping table. The highest battery temperature T12 is the battery temperature T1 in the three-dimensional mapping table. The judgment of the vehicle control unit that the battery is in the heating or cooling state is the same as the judgment of the battery in the system, and the judgment is not repeated here. And the vehicle control unit calls out a correction coefficient table under the current working condition according to the acquired battery temperature difference T3. The correction coefficient table has a mapping relation between the battery temperature difference T3 and a correction coefficient A, and the correction coefficient A corresponding to the battery temperature difference T3 is obtained from the correction coefficient table; s04, the vehicle controller multiplies the water pump control signal F by the correction coefficient A to obtain a target control signal F1; s05, the vehicle control unit sends out the F1 for controlling the water pump to rotate based on the battery system data; s06, the battery management system receives the F1 and transmits the F1 to the water pump; s07, the water pump receives the F1 and adjusts the working state of the water pump based on the F1. And the control and regulation of the vehicle control unit on the water pump are completed through the steps.
Preferably, the method further includes a step of diagnosing the water pump by the vehicle control unit after the step S07, and includes the steps of:
feeding back a water pump signal: the water pump feeds back the actual control signal F2 to the vehicle control unit through the battery management system;
judging a water pump signal: the vehicle control unit judges the working state of the water pump corresponding to the actual control signal F2;
reporting the state of the water pump: and the vehicle control unit reports the working state of the water pump.
Therefore, the normal operation of the water pump is guaranteed for timely finding the water pump fault. After the working state of the water pump is adjusted through the F1, feeding back the F2 to the vehicle control unit through the battery thermal management system; and the vehicle control unit judges the F2 so as to judge the working state of the water pump. The water pump diagnosing step includes: step 1, feeding back the F2 by the water pump; the battery management system receives the F2 and sends the F2 to the vehicle control unit; step 2, storing a state mapping table reflecting the relation between the F2 and the working state of the water pump in the vehicle controller; the vehicle control unit calls the state mapping table according to the F2 fed back by the water pump; diagnosing the working state of the water pump to obtain the working state of the water pump corresponding to the F2; and 3, reporting the working state of the water pump by the vehicle control unit. And F2, the working state of the water pump is diagnosed, and the normal operation of the water pump is ensured.
Preferably, in the step of determining the water pump signal, the vehicle controller performs a delay process on the determination of the actual control signal F2 when the electric vehicle is started.
Therefore, misdiagnosis of water pump faults is avoided. When the vehicle is started, the water pump receives the F1, and after the water pump works normally, the feedback F2 is delayed. The problem that the normal operation of the vehicle is influenced by misdiagnosis of the water pump fault is solved when the vehicle is started. And the vehicle control unit carries out corresponding delay processing on the F2 diagnosis fed back by the water pump when the vehicle control unit is started.
Preferably, the error of the actual control signal F2 is set to ± 2% by the vehicle control unit, and the water pump diagnosis method specifically includes:
f2=80%, reporting the water pump under-voltage or over-voltage fault;
f2=70%, reporting that the water pump works at an over-temperature;
f2=60%, the report 0 ≦ Duty ≦ 20%;
f2=50%, reporting that the water pump works normally;
f2=40%, and reporting the water pump locked-rotor fault;
f2=30%, reporting the water pump idling fault;
f2=20%, the signal line is grounded;
f2=10%, signal short power or floating.
Therefore, in order to guarantee the reliability and safety of the thermal management system, the vehicle control unit feeds back the F2 according to the water pump; and the working state of the water pump is judged and the diagnosis is made in time, so that the normal operation of the water pump is ensured. In order to avoid the influence on the normal operation of the thermal management system caused by the error of the F2 misdiagnosis, the vehicle controller sets the error of the F2 within a range of plus or minus 2%. The vehicle control unit diagnoses the water pump and judges the working state of the water pump according to the duty ratio signal fed back by the water pump, wherein the duty ratio signal comprises the following components: when the duty ratio of F2 fed back by the water pump is 50%, the vehicle control unit diagnoses that the water pump works normally and the water pump runs normally; when the duty ratio of F2 fed back by the water pump is 80%, the vehicle control unit diagnoses an under-voltage or over-voltage fault of the water pump, and the water pump stops running; when the duty ratio of F2 fed back by the water pump is 70%, the vehicle control unit diagnoses that the water pump works at an over-temperature state, and the operation of the water pump has the following three stages: in the first stage, if the temperature of the water pump is higher than 118 ℃, the power is reduced to operate; in the second stage, if the temperature of the water pump is continuously increased to be higher than 135 ℃, the water pump stops working; in the third stage, if the temperature of the water pump is recovered to be less than 110 ℃, the water pump enters normal operation again; when the Duty ratio of F2 fed back by the water pump is 60%, the vehicle controller diagnoses that 0 is less than or equal to 20% of Duty, and the water pump stops running; when the duty ratio of F2 fed back by the water pump is 40%, the vehicle control unit diagnoses the water pump stalling fault, and the water pump stops running in 1 Min; when the duty ratio of F2 fed back by the water pump is 30%, the vehicle control unit diagnoses the water pump idling fault, and the water pump stops running within 3 Min; when the duty ratio of F2 fed back by the water pump is 20%, the duty ratio signal line fed back by the vehicle controller diagnosis is grounded, and the water pump stops running; when the duty ratio of F2 fed back by the water pump is 10%, the vehicle controller diagnoses that the fed back duty ratio signal is short power or suspended, and the water pump runs at full speed.
In conclusion, the invention has the following beneficial effects:
1. the vehicle control unit controls the variable speed adjustment of the water pump, so that the operation of the water pump in a high-efficiency area is ensured, and the energy loss is minimum; ensuring that the battery works in a reasonable temperature range;
2. the calibration is continuously removed through thermal management simulation and high-low temperature experiment tests, and a three-dimensional mapping table and a correction coefficient table are obtained through correction, so that the processing speed and accuracy of the whole vehicle controller are greatly improved;
3. the vehicle control unit diagnoses the working state of the water pump in time according to a control signal fed back by the water pump; the safe operation of the water pump is guaranteed, and potential safety hazards caused by water pump faults are avoided;
4. when the electric vehicle is started, the vehicle control unit carries out time delay judgment processing on water pump diagnosis when the vehicle is started, and the problem that the normal operation of the vehicle is influenced due to water pump fault misdiagnosis is avoided.
Description of the drawings:
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a vehicle control unit according to a first embodiment of the invention;
FIG. 3 is a flowchart of a method for controlling a water pump according to a second embodiment of the present invention.
In the figure:
1. the system comprises a vehicle control unit, 2, a battery management system, 3, a water pump, 4 and a battery system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
In the first embodiment, as shown in fig. 1, the vehicle control system includes a vehicle control unit 1, a battery management system 2, a water pump 3, and a battery system 4; the battery management system 2 is respectively connected with the vehicle control unit 1, the water pump 3 and the battery system 4. The vehicle control unit 1 is used for sending a target control signal F1 for controlling the water pump 3 to rotate, and the battery management system 2 receives the target control signal F1 and transmits the target control signal F1 to the water pump 3. The rotation of the water pump 3 is controlled. The water pump 3 receives the target control signal F1 and adjusts the working state; the water pump 3 sends an actual control signal F2 to the battery management system 2, and the battery management system 2 transmits the actual control signal F2 to the vehicle control unit 1. The target control signal F1 and the actual control signal F2 are PWM duty signals for controlling the adjustment of the rotation speed of the water pump 3, which has the advantages of space saving and cost saving. The transmission method of the signal may be a wireless propagation technique in the prior art, and is not described in detail herein.
To obtain the target control signal F1. As shown in fig. 2, the vehicle control unit 1 includes a storage module, a retrieval module, a calculation module, and an output module. Firstly, continuously calibrating and correcting through thermal management simulation and high-low temperature experiment tests to obtain a three-dimensional mapping table and a correction coefficient table under different working conditions (fast charging, slow charging and driving heating), and storing the three-dimensional mapping table and the correction coefficient table in a storage module. Thermal management simulation and high and low temperature experiments are the contents of the prior art and are not described herein in detail. The three-dimensional mapping table reflects the mapping relation among the battery temperature T1, the battery pack water inlet temperature T2 and the water pump control signal F, and the correction coefficient table reflects the mapping relation between the battery temperature T3 and the correction coefficient A. In order to enable the battery to work in the optimal temperature range, the vehicle control unit 1 is preset with a low temperature threshold and a high temperature threshold of the battery. When the average temperature T4 of the battery is lower than the low temperature threshold, the vehicle control unit 1 heats the battery through the heating device; or when the average temperature T4 of the battery is higher than the high temperature threshold value, the temperature of the battery is reduced through the cooling device. In the process of heating or cooling the battery, the water pump 3 is required to drive the cooling liquid to circularly flow in the battery thermal management system. The heating device or the cooling device can realize effective heat dissipation, and the heating device or the cooling device is prevented from being broken down, so that the temperature of the battery can not be adjusted. The heating of the battery by the heating device controlled by the vehicle control unit 1 and the cooling of the battery by the cooling device controlled by the vehicle control unit 1 are contents of the prior art, and are not described herein again.
The battery management system 2 collects the temperature of the battery system in real time, the temperature of the battery system comprises a battery highest temperature T11, a battery lowest temperature T12, a battery pack water inlet temperature T2, a battery temperature difference T3 and a battery average temperature T4, and the temperature is transmitted to the vehicle control unit 1 in a communication mode. The temperature T2 of the water inlet of the battery pack is measured by a temperature sensor. The battery pack is formed by connecting a plurality of battery modules in series and parallel, and the highest battery temperature T11 is the highest temperature in the plurality of battery modules in series; the battery minimum temperature T12 is the minimum temperature among the plurality of string modules; the cell temperature difference T3 is the difference between the cell maximum temperature T11 and the cell minimum temperature T12; the battery average temperature T4 is the average temperature of all the battery modules connected in series-parallel.
The vehicle control unit 1 is connected with the heating device or the cooling device, and the vehicle control unit 1 judges that the output power of the heating device is not 0, namely the battery is in a heating state. The vehicle control unit 1 obtains the lowest temperature T11 of the battery and the temperature T2 of a water inlet of the battery pack; and the calling module calls the three-dimensional mapping table under the current working condition. The three-dimensional mapping table has a mapping relation among the battery temperature T1, the battery pack water inlet temperature T2 and the water pump control signal F, and the vehicle controller 1 obtains the corresponding water pump control signal F based on the battery minimum temperature T11 and the battery pack water inlet temperature T2. The lowest battery temperature T11 is the battery temperature T1 in the three-dimensional mapping table.
The vehicle control unit 1 determines that the output power of the cooling device is not 0, that is, the battery is in a cooling state. The vehicle control unit 1 obtains the highest temperature T12 of the battery and the temperature T2 of a water inlet of the battery pack; the calling module calls out a three-dimensional mapping table under the current working condition, and the vehicle control unit 1 obtains a corresponding water pump control signal F based on the maximum battery temperature T12 and the battery pack water inlet temperature T2. The highest battery temperature T12 is the battery temperature T1 in the three-dimensional mapping table.
And the calling module calls out a correction coefficient table under the current working condition according to the acquired battery temperature difference T3. The correction coefficient table has a mapping relation between the battery temperature difference T3 and the correction coefficient A, and the correction coefficient A corresponding to the battery temperature difference T3 is obtained from the correction coefficient table; and the calculation module multiplies the water pump control signal F by the obtained correction coefficient A to obtain a target control signal F1. The output module outputs F1. The battery management system 2 receives F1 and outputs it to the water pump 3 via a hardwire. The hard wire is a high-current circuit wire. The water pump 3 adjusts the rotating speed of the water pump according to the F1 and feeds back an actual control signal F2 to the battery management system 2, wherein the actual control signal F2 is a feedback signal after the water pump 3 receives the F1 and executes the F1; the battery management system 2 transmits the received F2 to the vehicle control unit 1. The reliability and the safety of the battery thermal management system are effectively improved, so that the battery system 4 works in a reasonable temperature range and keeps good performance.
And controlling different working states of the water pump 3 according to different F1 output by the vehicle control unit 1. When F1 output by the vehicle control unit 1 is at a low level or the duty ratio is 0-20%, the water pump 3 stops working; when the duty ratio of the output F1 is 20% -21%, the water pump 3 is in hysteresis; when the duty ratio of the output F1 is 21% -80%, the water pump 3 adjusts the rotating speed according to the received F1; when the output F1 is high or floating or the duty cycle is greater than 80%, the water pump 3 is rotating at full speed. The regulation of the operating state of the water pump 3 is controlled by outputting the different F1.
When the water pump 3 detects that the F1 is in a suspension state, the water pump can run at full speed, the F1 is a PWM duty ratio signal, and the synchronism of the control of the closing enabling signal of the low-voltage power supply relay of the water pump 3 and the F1 needs to be considered. The vehicle control unit 1 optimizes the F1 trigger condition sent to the network, and ensures that IGN ON awakening is ignition awakening no matter the vehicle control unit 1 is in a network awakening or IGN ON awakening state; as long as the power supply relay enable signal of the water pump 3 is sent, the F1 of the vehicle control unit 1 for controlling the rotating speed of the water pump 3 can also be sent synchronously.
the method comprises the following steps: a step of presetting a mapping table, wherein,
an operator continuously calibrates and corrects through thermal management simulation and high-low temperature experiment tests to obtain a three-dimensional mapping table and a correction coefficient table under different working conditions (fast charging, slow charging and driving heating), and inputs the three-dimensional mapping table and the correction coefficient table into the vehicle control unit 1. The three-dimensional mapping table reflects the mapping relation among the battery temperature T1, the temperature T2 of the water inlet of the battery pack and the water pump control signal F, and the correction coefficient table reflects the mapping relation between the battery temperature difference T3 and the correction coefficient A;
step two: a step of acquiring the data of the battery system,
the battery management system 2 detects the state of the battery system 4 in real time and sends the detected temperature of the battery system 4 to the vehicle control unit 1; the temperature of the battery system 4 comprises a battery highest temperature T11, a battery lowest temperature T12, a battery pack water inlet temperature T2, a battery temperature difference T3 and a battery average temperature T4;
step three: a step of obtaining the parameter in the mapping table,
the vehicle control unit 1 obtains the lowest temperature T11 of the battery and the temperature T2 of a water inlet of the battery pack when the battery is heated; and calling out the three-dimensional mapping table under the current working condition. The three-dimensional mapping table has a mapping relation among the battery temperature T1, the battery pack water inlet temperature T2 and the water pump control signal F, and the vehicle controller 1 obtains the corresponding water pump control signal F based on the battery lowest temperature T11 and the battery pack water inlet temperature T2; the lowest battery temperature T11 is the battery temperature T1 in the three-dimensional mapping table. The vehicle control unit 1 obtains the highest temperature T12 of the battery and the temperature T2 of a water inlet of the battery pack when the battery is in a cooling state; the vehicle control unit 1 calls out a three-dimensional mapping table under the current working condition, and obtains a corresponding water pump control signal F based on the highest battery temperature T12 and the battery pack water inlet temperature T2. The highest battery temperature T12 is the battery temperature T1 in the three-dimensional mapping table. The determination of the heating or cooling state of the battery by the vehicle control unit 1 is the same as the above discussion, and is not repeated here. And the vehicle control unit 1 calls out a correction coefficient table under the current working condition according to the acquired battery temperature difference T3. The correction coefficient table has a mapping relation between the battery temperature difference T3 and the correction coefficient A, and the correction coefficient A corresponding to the battery temperature difference T3 is obtained from the correction coefficient table;
step four, calculating a water pump control signal,
the vehicle control unit 1 multiplies the water pump control signal F by the correction coefficient A to obtain a target control signal F1;
step five: a step of sending out a control signal of the water pump,
the vehicle control unit 1 sends out F1 for controlling the water pump 3 to rotate based on the data of the battery system 4;
step six: a step of receiving a water pump control signal,
the battery management system 2 receives F1 and feeds the water feed pump 3;
step seven: controlling the water pump to adjust the step of,
the water pump 3 receives F1, and adjusts its operating state based on F1.
The control and regulation of the vehicle control unit 1 on the water pump 3 are completed through the steps. In order to find the fault of the water pump 3 in time and ensure the normal operation of the water pump 3. After the working state of the water pump 3 is adjusted through F1, a target control signal F2 is fed back to the vehicle control unit 1 through the battery thermal management system 2; the vehicle control unit 1 determines F2 to determine the operating state of the water pump 3. The water pump 3 diagnosis step comprises: step 1, feeding back F2 by the water pump 3; the battery management system 2 receives F2 and sends F2 to the vehicle control unit 1; step 2, a state mapping table reflecting the working state relation between the F2 and the water pump 3 is stored in the vehicle control unit 1; the vehicle control unit 1 calls a state mapping table according to F2 fed back by the water pump 3; diagnosing the working state of the water pump to obtain the working state of the water pump corresponding to F2; and step 3, reporting the working state of the water pump by the vehicle control unit 1. The diagnosis of the working state of the water pump 3 is completed through F2, and the normal operation of the water pump 3 is ensured. In addition, when the vehicle is started, the water pump 3 receives F1, and after the water pump 3 works normally, feedback F2 is delayed. In order to prevent the water pump 3 from being mistakenly diagnosed to influence the normal operation of the vehicle due to the water pump fault when the vehicle is started, the vehicle controller 1 performs corresponding delay processing on the diagnosis of the F2 fed back by the water pump 3 when the vehicle controller is just started.
In order to avoid the influence on the normal operation of the thermal management system caused by the error of F2 misdiagnosis, the error range of F2 is set within plus or minus 2%. The vehicle control unit 1 diagnoses the water pump 3 and judges the working state of the water pump according to the duty ratio signal fed back by the water pump 3, wherein the duty ratio signal comprises: when the duty ratio of the F2 fed back by the water pump 3 is 50%, the vehicle control unit 1 diagnoses that the water pump 3 normally works and the water pump 3 normally runs; when the duty ratio of the F2 fed back by the water pump 3 is 80%, the vehicle control unit 1 diagnoses an under-voltage or over-voltage fault of the water pump 3, and the water pump 3 stops running; when the duty ratio of the F2 fed back by the water pump 3 is 70%, the vehicle control unit 1 diagnoses the over-temperature operation of the water pump 3, and the operation of the water pump 3 has the following three stages: in the first stage, if the temperature of the water pump 3 is higher than 118 ℃, the power is reduced to operate; in the second stage, if the temperature of the water pump 3 is continuously increased to be higher than 135 ℃, the operation is stopped; in the third stage, if the temperature of the water pump 3 is recovered to be less than 110 ℃, the water pump 3 enters normal operation again; when the Duty ratio of the F2 fed back by the water pump 3 is 60%, the vehicle control unit 1 diagnoses that 0 is less than or equal to 20% of Duty, and the water pump 3 stops running; when the duty ratio of F2 fed back by the water pump 3 is 40%, the vehicle control unit 1 diagnoses the stalling fault of the water pump 3, and the water pump 1Min stops running; when the duty ratio of F2 fed back by the water pump 3 is 30%, the vehicle control unit 1 diagnoses an idling fault of the water pump 3, and stops running in the water pump 3 Min; when the duty ratio of the F2 fed back by the water pump 3 is 20%, the duty ratio signal line fed back by the vehicle controller 1 diagnosis is grounded, and the water pump 3 stops running; when the duty ratio of the F2 fed back by the water pump 3 is 10%, the duty ratio signal fed back by the vehicle control unit 1 diagnosis is short power or suspended, and the water pump 3 runs at full speed.
Claims (10)
1. A water pump control system of a power battery thermal management system is characterized by comprising a vehicle control unit (1), a battery management system (2), a water pump (3) and a battery system (4); the battery management system (2) is respectively connected with the vehicle control unit (1), the water pump (3) and the battery system (4), and the battery management system (2) is used for receiving a target control signal F1 sent by the vehicle control unit (1) and used for controlling the water pump (3) and sending the target control signal F1 to the water pump (3); the battery management system (2) monitors the state of the battery system (4) in real time and sends detection data to the vehicle control unit (1); the vehicle control unit (1) includes:
the storage module is used for storing a three-dimensional mapping table and a correction coefficient table, and the three-dimensional mapping table reflects the mapping relation among the battery temperature T1, the battery pack water inlet temperature T2 and the corresponding water pump control signal F; the correction coefficient table reflects the mapping relation between the battery temperature difference T3 and the corresponding correction coefficient A;
the adjusting module is used for adjusting the battery temperature T1 when the battery is heated or cooled, a water pump control signal F corresponding to the water inlet temperature T2 of the battery pack, and a correction coefficient A corresponding to the battery temperature difference T3 when the battery is heated or cooled;
the calculation module is used for calculating the product of the water pump control signal F and the correction coefficient A; namely the target control signal F1;
an output module for outputting the target control signal F1.
2. The water pump control system of the power battery thermal management system according to claim 1, wherein the battery management system (2) is further configured to receive an actual control signal F2 sent by the water pump (3) and send the actual control signal F2 to the vehicle control unit (1).
3. The water pump control system of the power battery thermal management system according to claim 2, wherein a state mapping table reflecting a mapping relation between the actual control signal F2 and the working state of the water pump (3) is stored in the vehicle control unit (1).
4. The water pump control system of the power battery thermal management system of claim 1, wherein the water pump control signal F, the target control signal F1 and the actual control signal F2 are PWM duty cycle signals.
5. The water pump control system of the power battery thermal management system according to claim 4, wherein the target control signal F1 and the water pump (3) are in a control relationship of:
output F1: 0-20%, and the water pump (3) stops working;
output F1: 20% -21%, and the water pump (3) is hysteresis;
output F1: 21% -80%, and the water pump (3) adjusts the rotating speed;
output F1: more than 80%, the water pump (3) rotates at full speed;
output F1: when the low level is connected, the water pump (3) stops working;
output F1: when the water pump is connected with a high level or suspended, the water pump (3) rotates at full speed.
6. The water pump control system of the power battery thermal management system according to claim 4, wherein the vehicle control unit (1) controls the target control signal F1 to be sent out simultaneously with a power supply relay enabling signal of the water pump (3).
7. A water pump control method of a power battery thermal management system is used for the water pump control system of the power battery thermal management system as claimed in any one of claims 1 to 6, and is characterized by specifically comprising the following steps:
s01, presetting a mapping table,
presetting the three-dimensional mapping table and the correction coefficient table in the whole vehicle controller (1);
SO2, acquiring battery system data,
the battery management system (2) acquires the data of the battery system (4) and sends the data to the vehicle control unit (1); the battery system (4) data comprises a battery highest temperature T11, a battery lowest temperature T12, a battery pack water inlet temperature T2, a battery temperature difference T3 and a battery average temperature T4;
s03, a step of obtaining parameters in the mapping table,
the vehicle control unit (1) respectively obtains the corresponding water pump control signal F and the corresponding correction coefficient A in the three-dimensional mapping table and the correction coefficient table based on the data of the battery system (4);
s04, calculating a water pump control signal,
the vehicle control unit (1) multiplies the water pump control signal F by the correction coefficient A to obtain a target control signal F1;
SO5, sending out a water pump control signal,
the vehicle control unit (1) sends out a target control signal F1 for controlling the water pump (3) to rotate;
s06, receiving a water pump control signal,
the battery management system (2) receives the target control signal F1 and transmits the target control signal F1 to the water pump (3);
s07, controlling the water pump to adjust,
the water pump (3) adjusts its operating state based on the target control signal F1.
8. The water pump control method of the power battery thermal management system according to claim 7, characterized in that after the step S07, the method further comprises a step of diagnosing the water pump (3) by the vehicle controller (1), and the method comprises the following steps:
feeding back a water pump signal: the water pump (3) feeds back the actual control signal F2 to the vehicle control unit (1) through the battery management system (2);
judging a water pump signal: the vehicle control unit (1) judges the working state of the water pump corresponding to the actual control signal F2;
reporting the state of the water pump: and the vehicle control unit (1) reports the working state of the water pump (3).
9. The water pump control method of the power battery thermal management system according to claim 8, wherein when an electric vehicle is started, in the step of determining the water pump signal, the vehicle control unit (1) performs delay processing on the determination of the actual control signal F2.
10. The water pump control method of the power battery thermal management system according to claim 9, wherein the vehicle control unit (1) sets the error of the actual control signal F2 to ± 2%, and the water pump (3) diagnosis method specifically includes the following steps:
f2=80%, reporting the undervoltage or overvoltage fault of the water pump (3);
f2=70%, reporting that the water pump (3) works at an over-temperature;
f2=60%, the report 0 ≦ Duty ≦ 20%;
f2=50%, reporting that the water pump (3) works normally;
f2=40%, and a locked rotor fault of the water pump (3) is reported;
f2=30%, reporting an idle running fault of the water pump (3);
f2=20%, the signal line is grounded;
f2=10%, signal short power or floating.
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