CN112964985B - Combined test system and method for electric drive system and power battery system - Google Patents
Combined test system and method for electric drive system and power battery system Download PDFInfo
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- CN112964985B CN112964985B CN202110203769.3A CN202110203769A CN112964985B CN 112964985 B CN112964985 B CN 112964985B CN 202110203769 A CN202110203769 A CN 202110203769A CN 112964985 B CN112964985 B CN 112964985B
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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
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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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
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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 discloses a combined test system and a method for an electric drive system and a power battery system, which utilize the electric efficiency etaedAnd the electric power generation efficiency etapgAvailable discharge power P with power battery systemdischarAvailable charging power PcharCalculating the maximum electric power P of the power battery system for allowing the motor to operateedAnd maximum generated power PpgAnd is converted into the maximum electric torque T of the power battery system allowing the motor to runedAnd a maximum power generation torque TpgAccording to Ted、TpgCompared with the preset electric torque design value T of the motordes1Design value T of motor generating torquedes2The comparison result limits the electric torque and the power generation torque, avoids the problem of over discharge or over charge of the battery caused by the difference of the intermediate conversion efficiency, avoids the damage of the battery, ensures the normal development of the combined test of the power battery system and the electric drive system, and also ensures the accuracy of the test result.
Description
Technical Field
The invention belongs to the field of electric drive system tests, and particularly relates to a combined test system and method for an electric drive system and a power battery system.
Background
With the gradual maturity of the research and development of new energy vehicles in China, the testing and verification technology for the electric drive system and the power battery system of the new energy vehicles is relatively mature. An electric drive system and a power battery system are used as core power systems of a new energy automobile, a simple, convenient and effective method for testing the matching between two sets of systems is not available at present, if a vehicle control unit is used for performing control testing on the two sets of systems, a large amount of useless control logic or signal detection on the vehicle control unit needs to be shielded, the process is complex, the consumed time is long, and the problem of the matching between a battery and an electric drive under a certain specific working condition cannot be effectively solved.
Disclosure of Invention
The invention aims to provide a combined test system and a combined test method for an electric drive system and a power battery system, so that the matching test of the electric drive system and the power battery system is realized, and the problem of over-discharge or over-charge of a battery is avoided.
The invention relates to a combined test system of an electric drive system and a power battery system, which comprises an electric drive system, a power battery system and a dynamometer system, wherein the dynamometer system is connected with the electric drive system; the combined test system further comprises a single chip microcomputer system and a computer, wherein the single chip microcomputer system is connected with the electric drive system, the power battery system and the dynamometer system, and the computer is connected with the single chip microcomputer system.
The invention relates to a combined test method of an electric drive system and a power battery system, which adopts the combined test system and comprises the following steps:
under the condition of meeting the test working condition, the single chip microcomputer system inquires a rotating speed-voltage-electric efficiency table according to the current rotating speed of the motor and the current voltage of the battery to obtain the electric efficiency eta of the motor in the electric drive systemedInquiring a rotating speed-voltage-power generation efficiency table according to the current rotating speed of the motor and the current battery voltage to obtain the power generation efficiency eta of the motor in the electric drive systempg(ii) a The rotating speed-voltage-electric efficiency table is a corresponding relation table of motor rotating speed, battery voltage and electric efficiency obtained through calibration, and the rotating speed-voltage-power generation efficiency table is a corresponding relation table of motor rotating speed, battery voltage and power generation efficiency obtained through calibration;
the singlechip system acquires the available discharge power P of the current power battery systemdischarAnd available charging power PcharAnd using the formula: ped=Pdischar*ηed ，Ppg=Pchar/ηpgCalculating the maximum electric power P of the power battery system for allowing the motor to operateedAnd maximum generated power Ppg；
The singlechip system utilizes the formula: t ised =9550*Ped /n ，Tpg =9550*Ppg The maximum electric torque T allowed by the power battery system to operate is calculated by the methodedAnd a maximum power generation torque Tpg(ii) a Wherein n is the current motor rotating speed;
maximum electric torque T for allowing motor to operate in power battery system by single chip microcomputer systemedCompared with the preset electric torque design value T of the motordes1Making a comparison if Ted＞Tdes1Then the preset motor is electrically twistedMoment design value Tdes1Sending the torque to an electric drive system for electric torque limitation; if T ised≤Tdes1Maximum electric torque T for allowing the power battery system to operate the motoredSending the torque to an electric drive system for electric torque limitation;
maximum power generation torque T of power battery system allowing motor to operate through single chip microcomputer systempgCompared with the preset design value T of the motor generating torquedes2Making a comparison if Tpg＞Tdes2And then the preset design value T of the motor generating torque is useddes2Sending the current to an electric drive system for power generation torque limitation; if T ispg≤Tdes2The maximum generating torque T of the power battery system for allowing the motor to operatepgSending the current to an electric drive system for power generation torque limitation;
and the single chip microcomputer system sends the acquired related parameter information of the dynamometer system, the acquired related parameter information of the electric drive system and the acquired related parameter information of the power battery system to a computer for storage, and the information is used for analyzing subsequent test data.
Because the power battery system on the new energy automobile needs to meet the power requirements of other electric appliances on the automobile besides the power requirements of the electric driving system, the available charging and discharging power of the power battery system is often greater than the required power of the electric driving system; therefore, the above method requires the maximum electric torque T that allows the power battery system to operate the motoredMaximum power generation torque TpgRespectively corresponding to the preset electric torque design value T of the motordes1Design value T of motor generating torquedes2The comparison is performed as a motor torque and power generation torque limit standard.
Preferably, if the current battery power is within a preset power threshold range, it indicates that the test condition is satisfied.
Preferably, the related parameter information of the dynamometer system comprises the rotating speed of the dynamometer system and the torque of the dynamometer system, the related parameter information of the electric drive system comprises the rotating speed of a motor, the power generation torque of the motor, the electric torque of the motor, the temperature of the motor and the temperature of an IGBT (insulated gate bipolar transistor), and the related parameter information of the power battery system comprises the voltage of the battery, the current of the battery, the electric quantity of the battery and the temperature of the battery.
The invention has the following effects:
(1) the combined test of the electric drive system and the power battery system (real battery pack) is realized, and the robustness of the electric drive system and the power battery system can be fully verified.
(2) Using electromotive efficiency etaedAnd electric power generation efficiency etapgAvailable discharge power P with power battery systemdischarAvailable charging power PcharCalculating the maximum electric power P of the power battery system for allowing the motor to operateedAnd maximum generated power PpgAnd is converted into the maximum electric torque T of the power battery system allowing the motor to runedAnd a maximum power generation torque TpgAccording to Ted、TpgCompared with the preset electric torque design value T of the motordes1Design value T of motor generating torquedes2The comparison result limits the electric torque and the power generation torque, avoids the problem of over discharge or over charge of the battery caused by the difference of the intermediate conversion efficiency, avoids the damage of the battery, ensures the normal development of the combined test of the power battery system and the electric drive system, and also ensures the accuracy of the test result.
Drawings
FIG. 1 is a schematic block diagram of a combined test system for an electric drive system and a power battery system.
FIG. 2 is a processing flow chart of the single chip microcomputer system in the invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
As shown in FIG. 1, the combined test system of the electric drive system and the power battery system comprises an electric drive system 1, a power battery system 2, a dynamometer system 3, a single chip microcomputer system 4 and a computer 5. The dynamometer system 3 is connected with the electric drive system 1, and the electric drive system 1 is connected with the power battery system 2; the single chip microcomputer system 4 is connected and communicated with the electric drive system 1, the power battery system 2 and the dynamometer system 3 through a CAN bus, and the computer 5 is connected and communicated with the single chip microcomputer system 4 through an RS232 serial port line.
As shown in fig. 2, the combined test method of the electric drive system and the power battery system adopts the combined test system as shown in fig. 1, and in the combined test method, the single chip microcomputer system 4 executes the following steps:
the method comprises the steps of firstly, judging whether a test working condition is met (namely judging whether the current battery electric quantity is within a preset electric quantity threshold range), if so, executing the second step, and if not, finishing;
secondly, inquiring a rotating speed-voltage-electric efficiency table according to the current rotating speed of the motor and the current voltage of the battery to obtain the electric efficiency eta of the motor in the electric drive system under the conditions of the current rotating speed of the motor and the current voltage of the batteryed(ii) a Inquiring a rotating speed-voltage-power generation efficiency table according to the current rotating speed of the motor and the current voltage of the battery to obtain the power generation efficiency eta of the motor in the electric drive system under the conditions of the current rotating speed of the motor and the current voltage of the batterypgThen, the third step is executed; the rotating speed-voltage-electric efficiency table is a corresponding relation table (stored in the single chip microcomputer system 4) of motor rotating speed, battery voltage and electric efficiency obtained through calibration, and the rotating speed-voltage-power generation efficiency table is a corresponding relation table (stored in the single chip microcomputer system 4) of motor rotating speed, battery voltage and power generation efficiency obtained through calibration;
thirdly, acquiring available discharge power P of the current power battery system through the CAN busdischarAnd available charging power PcharAnd using the formula: ped=Pdischar*ηed ，Ppg=Pchar/ηpgCalculating the maximum electric power P of the power battery system for allowing the motor to operateedAnd maximum generated power PpgThen, executing the fourth step;
fourthly, using a formula: t ised =9550*Ped /n ，Tpg =9550*Ppg The maximum electric torque T allowed by the power battery system to operate by the motor under the current motor rotating speed is calculatededAnd a maximum power generation torque TpgThen, the fifth step is executed; wherein n is the current motor rotating speed;
fifthly, judging the maximum electric power of the power battery system allowing the motor to operate under the current motor rotating speedTorque TedWhether the torque is larger than a preset motor electric torque design value T under the current motor rotating speeddes1If yes, executing the sixth step, otherwise executing the seventh step;
sixthly, presetting a motor electric torque design value T under the current motor rotating speeddes1Sending the torque to an electric drive system for electric torque limitation, and then executing an eighth step;
seventhly, enabling the maximum electric torque T of the power battery system to allow the motor to operate under the current motor rotating speededSending the torque to an electric drive system for electric torque limitation, and then executing an eighth step;
eighthly, judging the maximum power generation torque T allowed by the power battery system to operate by the motor under the current motor rotating speedpgWhether the torque is larger than a preset motor power generation torque design value T under the current motor rotating speeddes2If yes, executing the ninth step, otherwise executing the tenth step;
ninthly, presetting a motor generating torque design value T under the current motor rotating speeddes2Sending the current to an electric drive system for power generation torque limitation, and then executing an eleventh step;
tenth step, enabling the power battery system to allow the maximum power generation torque T of the motor to operate under the current motor rotating speedpgSending the current to an electric drive system for power generation torque limitation, and then executing an eleventh step;
and step eleven, sending the rotating speed of the dynamometer system, the torque of the dynamometer system, the rotating speed of the motor, the generating torque of the motor, the electric torque of the motor, the temperature of the IGBT (insulated gate bipolar transistor) temperature, the voltage of the battery, the current of the battery, the electric quantity of the battery and the temperature of the battery, which are acquired through the CAN bus (in the testing process), to the computer 5 for storage, analyzing subsequent test data, and then returning to execute the first step.
Claims (3)
1. A combined test method of an electric drive system and a power battery system is characterized in that the adopted combined test system comprises an electric drive system (1), the power battery system (2) and a dynamometer system (3), the dynamometer system (3) is connected with the electric drive system (1), and the electric drive system (1) is connected with the power battery system (2); the system is characterized by further comprising a single chip microcomputer system (4) and a computer (5), wherein the single chip microcomputer system (4) is connected with the electric driving system (1), the power battery system (2) and the dynamometer system (3), and the computer (5) is connected with the single chip microcomputer system (4);
the method is characterized by comprising the following steps:
under the condition of meeting the test working condition, the single chip microcomputer system (4) inquires a rotating speed-voltage-electric efficiency table according to the current rotating speed of the motor and the current battery voltage to obtain the electric efficiency eta of the motor in the electric drive systemedInquiring a rotating speed-voltage-power generation efficiency table according to the current rotating speed of the motor and the current battery voltage to obtain the power generation efficiency eta of the motor in the electric drive systempg(ii) a The rotating speed-voltage-electric efficiency table is a corresponding relation table of motor rotating speed, battery voltage and electric efficiency obtained through calibration, and the rotating speed-voltage-power generation efficiency table is a corresponding relation table of motor rotating speed, battery voltage and power generation efficiency obtained through calibration;
the singlechip system (4) acquires the available discharge power P of the current power battery systemdischarAnd available charging power PcharAnd using the formula: ped=Pdischar*ηed ，Ppg=Pchar/ηpgCalculating the maximum electric power P of the power battery system for allowing the motor to operateedAnd maximum generated power Ppg；
The singlechip system (4) utilizes the formula: t ised =9550*Ped /n ，Tpg =9550*Ppg The maximum electric torque T allowed by the power battery system to operate is calculated by the methodedAnd a maximum power generation torque Tpg(ii) a Wherein n is the current motor rotating speed;
the single chip microcomputer system (4) enables the power battery system to allow the maximum electric torque T of the motor to operateedCompared with the preset electric torque design value T of the motordes1Making a comparison if Ted＞Tdes1Then, the preset electric torque design value T of the motor is setdes1Sending the torque to an electric drive system for electric torque limitation; if T ised≤Tdes1Then the power battery system is allowed to operate the most of the motorsLarge electric torque TedSending the torque to an electric drive system for electric torque limitation;
the single chip microcomputer system (4) enables the power battery system to allow the maximum power generation torque T of the motor to operatepgCompared with the preset design value T of the motor generating torquedes2Making a comparison if Tpg＞Tdes2And then the preset design value T of the motor generating torque is useddes2Sending the current to an electric drive system for power generation torque limitation; if T ispg≤Tdes2The maximum generating torque T of the power battery system for allowing the motor to operatepgSending the current to an electric drive system for power generation torque limitation;
and the single chip microcomputer system (4) sends the acquired related parameter information of the dynamometer system, the acquired related parameter information of the electric drive system and the acquired related parameter information of the power battery system to the computer (5) for storage.
2. The method for jointly testing an electric drive system and a power battery system according to claim 1, characterized in that: and if the current battery electric quantity is within the preset electric quantity threshold range, the test condition is met.
3. The combined test method of an electric drive system and a power battery system according to claim 1 or 2, characterized in that: the related parameter information of the dynamometer system, the related parameter information of the electric drive system and the related parameter information of the power battery system comprise the rotating speed of the dynamometer system, the torque of the dynamometer system, the rotating speed of a motor, the generating torque of the motor, the electric torque of the motor, the temperature of an IGBT (insulated gate bipolar transistor), the voltage of the battery, the current of the battery, the electric quantity of the battery and the temperature of the battery.
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