CN110824367A - Hardware-in-loop test system and method for new energy automobile battery management system - Google Patents
Hardware-in-loop test system and method for new energy automobile battery management system Download PDFInfo
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- CN110824367A CN110824367A CN201910917314.0A CN201910917314A CN110824367A CN 110824367 A CN110824367 A CN 110824367A CN 201910917314 A CN201910917314 A CN 201910917314A CN 110824367 A CN110824367 A CN 110824367A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
Abstract
The invention provides a hardware-in-loop test system of a new energy automobile battery management system, which belongs to the technical field of battery management system test and comprises a computer, a switch, a CAN bus converter, a programmable numerical control power supply, a battery pack hardware simulation module, a signal hardware simulation module and a battery management system; one end of the computer is connected with the switch, and the other end of the computer is connected with the CAN bus converter; one end of the battery management system is respectively connected with the battery pack hardware simulation module, the signal hardware simulation module and the programmable numerical control power supply, and the other end of the battery management system is connected with the CAN bus converter; the battery pack hardware simulation module, the signal hardware simulation module and the programmable numerical control power supply are respectively connected with the switch; the invention also provides a hardware-in-loop test method of the new energy automobile battery management system. The invention has the advantages that: the method realizes the simulation of the actual use state of the battery, and tests the single battery balance and the battery charge state estimation of the battery management system.
Description
Technical Field
The invention relates to the technical field of battery management system testing, in particular to a hardware-in-the-loop testing system and method for a new energy automobile battery management system.
Background
The Battery Management System (BMS) is also called a battery caregiver or a battery manager and is used for intelligently managing and maintaining each unit of the battery, the state of the battery is monitored and managed in real time, the battery is prevented from being overcharged or overdischarged in the charging and using processes to cause safety accidents, and the service life of the battery is prolonged.
Due to the importance of the battery management system in the new energy automobile, the battery management system needs to be ensured to be operated safely and effectively on the new energy automobile, so that the function and the safety performance of the battery management system must be strictly tested in the development and production processes of the new energy automobile, and the operation reliability and the operation stability of the battery management system are further improved.
Conventionally, for the test of a battery management system, only the basic functions of monitoring a cell such as voltage acquisition, temperature acquisition and fault detection are tested, and the current test requirements cannot be met because the cell balance and the battery state of charge (SOC) estimation are not tested.
Through retrieval, chinese patent application No. 201810184528.7, having application date of 2018.03.06, discloses a performance testing method and device for a battery management system, which can only test basic functions of electric core monitoring such as voltage acquisition, temperature acquisition and fault detection of the battery management system, but has no effective testing method for cell balancing and battery state of charge estimation functions which are more important for new energy vehicles.
Disclosure of Invention
One of the technical problems to be solved by the present invention is to provide a hardware-in-the-loop test system for a battery management system of a new energy vehicle, which realizes simulation of an actual use state of a battery and tests single battery equalization and battery state-of-charge estimation of the battery management system.
The invention realizes one of the technical problems as follows: a hardware-in-loop test system for a new energy automobile battery management system comprises a computer, a switch, a CAN bus converter, a programmable numerical control power supply, a battery pack hardware simulation module, a signal hardware simulation module and a battery management system;
one end of the computer is connected with the switch, and the other end of the computer is connected with the CAN bus converter; one end of the battery management system is respectively connected with the battery pack hardware simulation module, the signal hardware simulation module and the programmable numerical control power supply, and the other end of the battery management system is connected with the CAN bus converter; and the battery pack hardware simulation module, the signal hardware simulation module and the programmable numerical control power supply are respectively connected with the switch.
Furthermore, the battery pack hardware simulation module comprises a battery pack simulation controller, a single battery simulator group, a multi-path battery temperature simulator, a battery pack total voltage simulator and a battery pack total current simulator;
one end of each of the single battery simulator group, the multi-path battery temperature simulator, the battery pack total voltage simulator and the battery pack total current simulator is connected with the battery pack simulation controller, and the other end of each of the single battery simulator group, the multi-path battery temperature simulator, the battery pack total voltage simulator and the battery pack total current simulator is connected with the battery management system; the battery pack analog controller is connected with the switch.
Further, the single battery simulator group comprises a plurality of single battery simulators which are connected in series.
Furthermore, the signal hardware simulation module comprises a signal simulation controller, a signal fault simulator, a charging signal simulator, an insulation impedance simulator, an I/O signal detector and an I/O signal output device;
one end of each of the signal fault simulator, the charging signal simulator, the insulation impedance simulator, the I/O signal detector and the I/O signal output device is connected with the signal simulation controller, and the other end of each of the signal fault simulator, the charging signal simulator, the insulation impedance simulator, the I/O signal detector and the I/O signal output device is connected with the battery management system; the signal simulation controller is connected with the switch.
The second technical problem to be solved by the present invention is to provide a hardware-in-the-loop testing method for a battery management system of a new energy vehicle, so as to simulate the actual use state of a battery, and test the single battery balance and the battery state-of-charge estimation of the battery management system.
The invention realizes the second technical problem in the following way: a hardware-in-loop test method for a battery management system of a new energy automobile needs to use the test system, and comprises the following steps:
step S1, setting simulation parameters of single battery equalization, battery state of charge estimation or battery core monitoring through a computer, and sending the simulation parameters to a battery pack hardware simulation module or a signal hardware simulation module by using an exchanger;
step S2, the battery pack hardware simulation module or the signal hardware simulation module outputs the simulation condition of the battery to the battery management system according to the received simulation parameter;
step S3, the battery management system starts the functions of single battery equalization, battery state of charge estimation or battery core monitoring according to the simulation working condition, and the battery management system sends the processing result to a computer through a CAN bus converter;
and step S4, testing the single battery balancing, battery state of charge estimation or battery core monitoring function of the battery management system by the computer according to the received processing result and the simulation parameter.
Further, the cell balancing test comprises the following steps:
step S11, setting voltage parameters, a first threshold value and standard voltage of the single battery simulator group through a computer, and sending the voltage parameters to a battery pack simulation controller by using a switch; the computer sends the standard voltage to a battery management system; the voltage parameter is the voltage of each single battery simulator with different voltage values;
step S12, the battery pack simulation controller respectively sets the voltage of each single battery simulator according to the received voltage parameters, and each single battery simulator respectively outputs different voltage values to the battery management system;
step S13, the battery management system starts the single battery balancing function, balances the output voltage of each single battery simulator according to the standard voltage, and sends the output voltage of each single battery simulator before and after balancing to the computer through the CAN bus converter;
and step S14, the computer tests the single battery balancing function of the battery management system according to the output voltage of each single battery simulator before balancing, the output voltage of each single battery simulator after balancing, the voltage parameter, the first threshold and the standard voltage.
Further, the step S14 specifically includes:
step S141, comparing the output voltage and the voltage parameter of each single battery simulator before equalization by a computer, judging whether the output voltage and the voltage parameter are equal, if so, indicating that the battery management system can correctly read the output voltage of each single battery simulator, and entering step S142; if the voltage values are not equal, the battery management system cannot correctly read the output voltage of each single battery simulator, and the process is ended;
step S142, judging whether the absolute value of the difference value between the output voltage of each balanced single battery simulator and the standard voltage is smaller than a first threshold value by a computer, if so, judging that the single battery balancing function of the output battery management system is normal, and ending the process; and if not, the single battery balancing function of the output battery management system is abnormal, and the process is ended.
Further, the battery state of charge estimation test comprises the following steps:
step S21, setting a battery charge state parameter and a second threshold value of a battery pack hardware simulation module through a computer, and sending the battery charge state parameter to a battery pack simulation controller by using a switch; the battery state of charge parameters are voltage, current and temperature parameters for setting the battery electric quantity to be a preset percentage;
step S22, the battery pack simulation controller respectively sets the temperature, the voltage and the current of a plurality of paths of battery temperature simulators, a battery pack total voltage simulator and a battery pack total current simulator according to the received battery state of charge parameters, and outputs the corresponding battery state of charge to a battery management system;
step S23, the battery management system starts a battery state of charge estimation function, estimates the battery state of charge output by the battery pack hardware simulation module to generate estimation data, and sends the estimation data to a computer through a CAN bus converter;
step S24, the computer judges whether the estimation error of the battery management system is smaller than the second threshold value according to the received estimation data and the battery state of charge parameter, if so, the battery state of charge estimation function of the output battery management system is normal, and the process is ended; and if not, outputting the abnormal battery state of charge estimation function of the battery management system, and ending the process.
Further, the cell monitoring function test comprises the following steps:
step S31, setting fault parameters through a computer, and sending the fault parameters to a battery pack simulation controller and a signal simulation controller by using a switch; the fault parameters at least comprise a battery temperature fault parameter, a battery voltage fault parameter, a battery current fault parameter, a battery overvoltage fault parameter and a battery overcurrent fault parameter;
step S32, the battery pack simulation controller sets the temperature, voltage and current of the multi-path battery temperature simulator, the battery pack total voltage simulator and the battery pack total current simulator respectively according to the received fault parameters, and outputs the temperature, voltage and current to the battery management system; the signal simulation controller respectively sets a signal fault simulator, a charging signal simulator, an insulation impedance simulator, an I/O signal detector and an I/O signal output device according to the received fault parameters to output corresponding fault simulation signals to the battery management system;
step S33, the battery management system starts a cell monitoring function, performs cell monitoring to generate a monitoring result according to the received fault simulation signal and the temperature, the voltage and the current output by the battery pack hardware simulation module, and sends the monitoring result to a computer through a CAN bus converter;
and step S44, the computer judges whether the battery core monitoring function of the battery management system is normal according to the received monitoring result and the fault parameter.
The invention has the advantages that:
1. the hardware of the battery pack is simulated by setting the battery pack hardware simulation module, and the signal of the battery pack is simulated by setting the signal hardware simulation module, so that the actual use state of the battery is simulated; outputting different voltages to a battery management system through each single battery simulator of the battery pack hardware simulation module, so as to test the single battery balance of the battery management system; the set battery charge state is output to the battery management system by the battery pack hardware simulation module, so that the battery charge state estimation of the battery management system is tested.
2. Through the computer sets up the parameter of group battery hardware simulation module and signal hardware simulation module, and then the actual use state of simulation battery tests battery management system, has realized full-automatic batch and circulation aging testing, for the manual test one by one in the tradition, very big promotion efficiency of software testing.
3. Through the actual use state of battery is simulated to group battery hardware simulation module and signal hardware simulation module, tests battery management system for actually driving new energy automobile, has avoided personnel and vehicle to produce the accident, has guaranteed the security of test.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic circuit block diagram of a hardware-in-the-loop test system of a new energy automobile battery management system according to the invention.
Fig. 2 is a flowchart of a hardware-in-loop testing method for a new energy vehicle battery management system according to the present invention.
Detailed Description
Referring to fig. 1 to 2, a preferred embodiment of a hardware-in-the-loop test system for a new energy vehicle battery management system according to the present invention includes a computer, a switch, a CAN bus converter, a programmable numerical control power supply, a battery hardware simulation module, a signal hardware simulation module, and a battery management system; the computer is used for running test software, creating a battery model and setting battery parameters; the switch is used for providing expansion of a LAN communication port; the CAN bus converter is used for converting CAN bus signals into USB signals; the programmable numerical control power supply is used for providing a working power supply for the battery management system; the battery pack hardware simulation module is used for simulating hardware of a battery pack; the signal hardware simulation module is used for simulating a signal of the battery pack; the battery management system is a system to be tested.
One end of the computer is connected with the switch, and the other end of the computer is connected with the CAN bus converter; one end of the battery management system is respectively connected with the battery pack hardware simulation module, the signal hardware simulation module and the programmable numerical control power supply, and the other end of the battery management system is connected with the CAN bus converter; and the battery pack hardware simulation module, the signal hardware simulation module and the programmable numerical control power supply are respectively connected with the switch.
The battery pack hardware simulation module comprises a battery pack simulation controller, a single battery simulator group, a multi-path battery temperature simulator, a battery pack total voltage simulator and a battery pack total current simulator; the battery pack simulation controller is used for receiving control commands and data sent by a computer and controlling the single battery simulator group, the multi-path battery temperature simulator, the battery pack total voltage simulator and the battery pack total current simulator to output corresponding simulation signals; the single battery simulator group is used for outputting voltage and current signals of the plurality of single battery simulators and detecting whether the current voltage and current are normal or not; the multi-path battery temperature simulator is used for simulating and outputting a temperature signal of the battery pack; the battery pack total voltage simulator is used for simulating and outputting a total voltage signal of the battery pack; the battery pack total current simulator is used for simulating and outputting a total current signal of the battery pack.
One end of each of the single battery simulator group, the multi-path battery temperature simulator, the battery pack total voltage simulator and the battery pack total current simulator is connected with the battery pack simulation controller, and the other end of each of the single battery simulator group, the multi-path battery temperature simulator, the battery pack total voltage simulator and the battery pack total current simulator is connected with the battery management system; the battery pack analog controller is connected with the switch.
The single battery simulator group comprises a plurality of single battery simulators which are connected in series.
The signal hardware simulation module comprises a signal simulation controller, a signal fault simulator, a charging signal simulator, an insulation impedance simulator, an I/O signal detector and an I/O signal output device; the signal simulation controller is used for receiving control commands and data sent by a computer, controlling the signal fault simulator, the charging signal simulator, the insulation impedance simulator, the I/O signal detector and the I/O signal output device to output corresponding simulation signals, and uploading the signals detected by the simulators to the computer; the signal fault simulator is used for outputting corresponding fault signals according to the requirements of the test process; the charging signal simulator is used for simulating access signals of various charging piles and detecting state signals fed back by the battery management system in the charging process; the insulation impedance simulator is used for simulating the insulation condition between the total battery pack pressure and the vehicle body of the new energy vehicle; the I/O signal detector is used for detecting the state of a control signal output by the battery management system in the test process; the I/O signal output device is used for simulating and outputting output signals of other controllers of the new energy automobile in the test process.
One end of each of the signal fault simulator, the charging signal simulator, the insulation impedance simulator, the I/O signal detector and the I/O signal output device is connected with the signal simulation controller, and the other end of each of the signal fault simulator, the charging signal simulator, the insulation impedance simulator, the I/O signal detector and the I/O signal output device is connected with the battery management system; the signal simulation controller is connected with the switch.
The invention discloses a better embodiment of a hardware-in-loop test method of a new energy automobile battery management system, which comprises the following steps:
step S1, setting simulation parameters of single battery equalization, battery state of charge estimation or battery core monitoring through a computer, and sending the simulation parameters to a battery pack hardware simulation module or a signal hardware simulation module by using an exchanger;
step S2, the battery pack hardware simulation module or the signal hardware simulation module outputs the simulation condition of the battery to the battery management system according to the received simulation parameter;
step S3, the battery management system starts the functions of single battery equalization, battery state of charge estimation or battery core monitoring according to the simulation working condition, and the battery management system sends the processing result to a computer through a CAN bus converter;
and step S4, testing the single battery balancing, battery state of charge estimation or battery core monitoring function of the battery management system by the computer according to the received processing result and the simulation parameter.
The cell balancing test comprises the following steps:
step S11, setting voltage parameters, a first threshold value and standard voltage of the single battery simulator group through a computer, and sending the voltage parameters to a battery pack simulation controller by using a switch; the computer sends the standard voltage to a battery management system; the voltage parameter is the voltage of each single battery simulator with different voltage values;
step S12, the battery pack simulation controller respectively sets the voltage of each single battery simulator according to the received voltage parameters, and each single battery simulator respectively outputs different voltage values to the battery management system;
step S13, the battery management system starts the single battery balancing function, balances the output voltage of each single battery simulator according to the standard voltage, and sends the output voltage of each single battery simulator before and after balancing to the computer through the CAN bus converter; for example, the standard voltage is 5V, the output voltages of the two cell simulators are 4V and 6V, respectively, the battery management system needs to discharge the 6V cell simulator to 5V, and charge the 4V cell simulator to 5V;
and step S14, the computer tests the single battery balancing function of the battery management system according to the output voltage of each single battery simulator before balancing, the output voltage of each single battery simulator after balancing, the voltage parameter, the first threshold and the standard voltage.
The step S14 specifically includes:
step S141, comparing the output voltage and the voltage parameter of each single battery simulator before equalization by a computer, judging whether the output voltage and the voltage parameter are equal, if so, indicating that the battery management system can correctly read the output voltage of each single battery simulator, and entering step S142; if the voltage values are not equal, the battery management system cannot correctly read the output voltage of each single battery simulator, and the process is ended;
step S142, judging whether the absolute value of the difference value between the output voltage of each balanced single battery simulator and the standard voltage is smaller than a first threshold value by a computer, if so, judging that the single battery balancing function of the output battery management system is normal, and ending the process; and if not, the single battery balancing function of the output battery management system is abnormal, and the process is ended.
The battery state of charge estimation test comprises the following steps:
step S21, setting a battery charge state parameter and a second threshold value of a battery pack hardware simulation module through a computer, and sending the battery charge state parameter to a battery pack simulation controller by using a switch; the battery state of charge parameters are voltage, current and temperature parameters for setting the battery electric quantity to be a preset percentage; estimating the state of charge of the battery, namely estimating how long the electric quantity of the battery can be used under a specific percentage, wherein the specific percentage of the electric quantity needs to be obtained by simulating voltage, current and temperature parameters;
step S22, the battery pack simulation controller respectively sets the temperature, the voltage and the current of a plurality of paths of battery temperature simulators, a battery pack total voltage simulator and a battery pack total current simulator according to the received battery state of charge parameters, and outputs the corresponding battery state of charge to a battery management system;
step S23, the battery management system starts a battery state of charge estimation function, estimates the battery state of charge output by the battery pack hardware simulation module to generate estimation data, and sends the estimation data to a computer through a CAN bus converter;
step S24, the computer judges whether the estimation error of the battery management system is smaller than the second threshold value according to the received estimation data and the battery state of charge parameter, if so, the battery state of charge estimation function of the output battery management system is normal, and the process is ended; and if not, outputting the abnormal battery state of charge estimation function of the battery management system, and ending the process.
The cell monitoring function test comprises the following steps:
step S31, setting fault parameters through a computer, and sending the fault parameters to a battery pack simulation controller and a signal simulation controller by using a switch; the fault parameters at least comprise a battery temperature fault parameter, a battery voltage fault parameter, a battery current fault parameter, a battery overvoltage fault parameter and a battery overcurrent fault parameter;
step S32, the battery pack simulation controller sets the temperature, voltage and current of the multi-path battery temperature simulator, the battery pack total voltage simulator and the battery pack total current simulator respectively according to the received fault parameters, and outputs the temperature, voltage and current to the battery management system; the signal simulation controller respectively sets a signal fault simulator, a charging signal simulator, an insulation impedance simulator, an I/O signal detector and an I/O signal output device according to the received fault parameters to output corresponding fault simulation signals to the battery management system;
step S33, the battery management system starts a cell monitoring function, performs cell monitoring to generate a monitoring result according to the received fault simulation signal and the temperature, the voltage and the current output by the battery pack hardware simulation module, and sends the monitoring result to a computer through a CAN bus converter;
and step S44, the computer judges whether the battery core monitoring function of the battery management system is normal according to the received monitoring result and the fault parameter.
In summary, the invention has the advantages that:
1. the hardware of the battery pack is simulated by setting the battery pack hardware simulation module, and the signal of the battery pack is simulated by setting the signal hardware simulation module, so that the actual use state of the battery is simulated; outputting different voltages to a battery management system through each single battery simulator of the battery pack hardware simulation module, so as to test the single battery balance of the battery management system; the set battery charge state is output to the battery management system by the battery pack hardware simulation module, so that the battery charge state estimation of the battery management system is tested.
2. Through the computer sets up the parameter of group battery hardware simulation module and signal hardware simulation module, and then the actual use state of simulation battery tests battery management system, has realized full-automatic batch and circulation aging testing, for the manual test one by one in the tradition, very big promotion efficiency of software testing.
3. Through the actual use state of battery is simulated to group battery hardware simulation module and signal hardware simulation module, tests battery management system for actually driving new energy automobile, has avoided personnel and vehicle to produce the accident, has guaranteed the security of test.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (9)
1. The utility model provides a new energy automobile battery management system hardware is at ring test system which characterized in that: the system comprises a computer, a switch, a CAN bus converter, a programmable numerical control power supply, a battery pack hardware simulation module, a signal hardware simulation module and a battery management system;
one end of the computer is connected with the switch, and the other end of the computer is connected with the CAN bus converter; one end of the battery management system is respectively connected with the battery pack hardware simulation module, the signal hardware simulation module and the programmable numerical control power supply, and the other end of the battery management system is connected with the CAN bus converter; and the battery pack hardware simulation module, the signal hardware simulation module and the programmable numerical control power supply are respectively connected with the switch.
2. The hardware-in-the-loop test system for the battery management system of the new energy automobile as claimed in claim 1, wherein: the battery pack hardware simulation module comprises a battery pack simulation controller, a single battery simulator group, a multi-path battery temperature simulator, a battery pack total voltage simulator and a battery pack total current simulator;
one end of each of the single battery simulator group, the multi-path battery temperature simulator, the battery pack total voltage simulator and the battery pack total current simulator is connected with the battery pack simulation controller, and the other end of each of the single battery simulator group, the multi-path battery temperature simulator, the battery pack total voltage simulator and the battery pack total current simulator is connected with the battery management system; the battery pack analog controller is connected with the switch.
3. The hardware-in-the-loop test system for the battery management system of the new energy automobile as claimed in claim 1, wherein: the single battery simulator group comprises a plurality of single battery simulators which are connected in series.
4. The hardware-in-the-loop test system for the battery management system of the new energy automobile as claimed in claim 1, wherein: the signal hardware simulation module comprises a signal simulation controller, a signal fault simulator, a charging signal simulator, an insulation impedance simulator, an I/O signal detector and an I/O signal output device;
one end of each of the signal fault simulator, the charging signal simulator, the insulation impedance simulator, the I/O signal detector and the I/O signal output device is connected with the signal simulation controller, and the other end of each of the signal fault simulator, the charging signal simulator, the insulation impedance simulator, the I/O signal detector and the I/O signal output device is connected with the battery management system; the signal simulation controller is connected with the switch.
5. A hardware-in-loop test method for a new energy automobile battery management system is characterized by comprising the following steps: the method requires the use of a test system according to any of claims 1 to 4, comprising the steps of:
step S1, setting simulation parameters of single battery equalization, battery state of charge estimation or battery core monitoring through a computer, and sending the simulation parameters to a battery pack hardware simulation module or a signal hardware simulation module by using an exchanger;
step S2, the battery pack hardware simulation module or the signal hardware simulation module outputs the simulation condition of the battery to the battery management system according to the received simulation parameter;
step S3, the battery management system starts the functions of single battery equalization, battery state of charge estimation or battery core monitoring according to the simulation working condition, and the battery management system sends the processing result to a computer through a CAN bus converter;
and step S4, testing the single battery balancing, battery state of charge estimation or battery core monitoring function of the battery management system by the computer according to the received processing result and the simulation parameter.
6. The hardware-in-the-loop test method for the battery management system of the new energy automobile as claimed in claim 5, characterized in that: the cell balancing test comprises the following steps:
step S11, setting voltage parameters, a first threshold value and standard voltage of the single battery simulator group through a computer, and sending the voltage parameters to a battery pack simulation controller by using a switch; the computer sends the standard voltage to a battery management system; the voltage parameter is the voltage of each single battery simulator with different voltage values;
step S12, the battery pack simulation controller respectively sets the voltage of each single battery simulator according to the received voltage parameters, and each single battery simulator respectively outputs different voltage values to the battery management system;
step S13, the battery management system starts the single battery balancing function, balances the output voltage of each single battery simulator according to the standard voltage, and sends the output voltage of each single battery simulator before and after balancing to the computer through the CAN bus converter;
and step S14, the computer tests the single battery balancing function of the battery management system according to the output voltage of each single battery simulator before balancing, the output voltage of each single battery simulator after balancing, the voltage parameter, the first threshold and the standard voltage.
7. The hardware-in-the-loop test method for the battery management system of the new energy automobile as claimed in claim 6, characterized in that: the step S14 specifically includes:
step S141, comparing the output voltage and the voltage parameter of each single battery simulator before equalization by a computer, judging whether the output voltage and the voltage parameter are equal, if so, indicating that the battery management system can correctly read the output voltage of each single battery simulator, and entering step S142; if the voltage values are not equal, the battery management system cannot correctly read the output voltage of each single battery simulator, and the process is ended;
step S142, judging whether the absolute value of the difference value between the output voltage of each balanced single battery simulator and the standard voltage is smaller than a first threshold value by a computer, if so, judging that the single battery balancing function of the output battery management system is normal, and ending the process; and if not, the single battery balancing function of the output battery management system is abnormal, and the process is ended.
8. The hardware-in-the-loop test method for the battery management system of the new energy automobile as claimed in claim 5, characterized in that: the battery state of charge estimation test comprises the following steps:
step S21, setting a battery charge state parameter and a second threshold value of a battery pack hardware simulation module through a computer, and sending the battery charge state parameter to a battery pack simulation controller by using a switch; the battery state of charge parameters are voltage, current and temperature parameters for setting the battery electric quantity to be a preset percentage;
step S22, the battery pack simulation controller respectively sets the temperature, the voltage and the current of a plurality of paths of battery temperature simulators, a battery pack total voltage simulator and a battery pack total current simulator according to the received battery state of charge parameters, and outputs the corresponding battery state of charge to a battery management system;
step S23, the battery management system starts a battery state of charge estimation function, estimates the battery state of charge output by the battery pack hardware simulation module to generate estimation data, and sends the estimation data to a computer through a CAN bus converter;
step S24, the computer judges whether the estimation error of the battery management system is smaller than the second threshold value according to the received estimation data and the battery state of charge parameter, if so, the battery state of charge estimation function of the output battery management system is normal, and the process is ended; and if not, outputting the abnormal battery state of charge estimation function of the battery management system, and ending the process.
9. The hardware-in-the-loop test method for the battery management system of the new energy automobile as claimed in claim 5, characterized in that: the cell monitoring function test comprises the following steps:
step S31, setting fault parameters through a computer, and sending the fault parameters to a battery pack simulation controller and a signal simulation controller by using a switch; the fault parameters at least comprise a battery temperature fault parameter, a battery voltage fault parameter, a battery current fault parameter, a battery overvoltage fault parameter and a battery overcurrent fault parameter;
step S32, the battery pack simulation controller sets the temperature, voltage and current of the multi-path battery temperature simulator, the battery pack total voltage simulator and the battery pack total current simulator respectively according to the received fault parameters, and outputs the temperature, voltage and current to the battery management system; the signal simulation controller respectively sets a signal fault simulator, a charging signal simulator, an insulation impedance simulator, an I/O signal detector and an I/O signal output device according to the received fault parameters to output corresponding fault simulation signals to the battery management system;
step S33, the battery management system starts a cell monitoring function, performs cell monitoring to generate a monitoring result according to the received fault simulation signal and the temperature, the voltage and the current output by the battery pack hardware simulation module, and sends the monitoring result to a computer through a CAN bus converter;
and step S44, the computer judges whether the battery core monitoring function of the battery management system is normal according to the received monitoring result and the fault parameter.
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