CN106226698B - Method and system for testing driving range of pure electric vehicle - Google Patents
Method and system for testing driving range of pure electric vehicle Download PDFInfo
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- 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]
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
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- G01L5/13—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the tractive or propulsive power of vehicles
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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]
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Abstract
The invention discloses a method and a system for testing the driving range of a pure electric vehicle. The method comprises the following steps: charging the detected vehicle until the vehicle is fully charged; the method comprises the following steps of (1) mounting a tested vehicle on an automobile chassis dynamometer, and controlling the tested vehicle to carry out N times of cyclic tests according to a target test working condition through the automobile chassis dynamometer; acquiring the driving range of a tested vehicle in N times of cycle tests and a first parameter value of a power battery in the N times of cycle tests; controlling the tested vehicle to test according to the highest vehicle speed, and stopping the test until a preset condition is reached; collecting a second parameter value of the power battery during the highest vehicle speed test; and estimating the driving range of the tested vehicle under the complete working condition cycle according to the driving range of the tested vehicle under the N times of cycle tests, the first parameter value and the second parameter value. The driving range can be quickly tested, the accuracy of the test result can be ensured, the repeatability is high, the operation is simple and convenient, and the test period and the cost are saved.
Description
Technical Field
The invention relates to the technical field of electric automobiles, in particular to a method and a system for testing the driving range of a pure electric automobile.
Background
At present, the Driving range of a pure electric vehicle is complex in test condition, long in test time and incapable of being interrupted in the test process, for example, taking the New European Driving Cycle (European oil consumption and emission evaluation standard) as an example, on average, one NEDC Cycle is about 11 kilometers, and the test time is close to 20 minutes. That is, when a pure electric vehicle capable of running for example 330 km under the NEDC working condition is tested, the driving range is about 10 hours, and when a complete driving range test such as vehicle fixing and chassis dynamometer debugging is performed, the driving range is about 12 hours. However, the driving range of the pure electric vehicle is longer and longer in the future, and the current driving range testing method results in long testing period, high testing cost and the like. Therefore, how to rapidly test the driving range, ensure accurate test results, and save the test period and cost, which is simple and convenient to operate, has become a problem to be solved urgently.
Disclosure of Invention
The object of the present invention is to solve at least to some extent one of the above mentioned technical problems.
Therefore, a first object of the present invention is to provide a method for testing a driving range of a pure electric vehicle. The method can quickly test the driving range, can ensure accurate test result, has high repeatability and simple and convenient operation, and can save test period and cost.
The second purpose of the invention is to provide a system for testing the driving range of the pure electric vehicle.
In order to achieve the above object, a method for testing a driving range of a pure electric vehicle according to an embodiment of the first aspect of the present invention includes: charging a tested vehicle until a power battery in the tested vehicle is fully charged; the tested vehicle is arranged on an automobile chassis dynamometer, and the tested vehicle is controlled to carry out N times of cycle tests according to the target test working condition through the automobile chassis dynamometer; acquiring the driving range of the tested vehicle during the N times of cycle tests and a first parameter value of the power battery during the N times of cycle tests; controlling the tested vehicle to test according to the highest vehicle speed, and stopping the test until a preset condition is reached; collecting a second parameter value of the power battery during the highest vehicle speed test; and estimating the driving range of the tested vehicle under the complete working condition cycle according to the driving range of the tested vehicle under the N times of cycle tests and the first parameter value and the second parameter value.
According to the method for testing the driving range of the pure electric vehicle, the tested vehicle can be charged firstly until the power battery in the tested vehicle is fully charged, and then, the tested vehicle can be arranged on the automobile chassis dynamometer and is controlled to carry out N times of cycle tests according to the target test working condition through the automobile chassis dynamometer, and collecting the driving range of the tested vehicle in the N times of cycle tests and the first parameter value of the power battery in the N times of cycle tests, then, the tested vehicle is controlled to test according to the highest vehicle speed, the test is stopped until a preset condition is reached, a second parameter value of the power battery is collected during the highest vehicle speed test, and finally, and estimating the driving range of the tested vehicle under the complete working condition cycle according to the driving range of the tested vehicle under the N times of cycle tests, the first parameter value and the second parameter value. Compared with the traditional test mode, the test process is simplified, the driving range can be rapidly tested, the accuracy of the test result can be ensured, the repeatability is high, the operation is simple and convenient, and the test period and the cost are saved.
According to an embodiment of the invention, the first parameter value comprises a first voltage value and a first current value, and/or a first discharge electric quantity value and a first charge electric quantity value; the second parameter value includes a second voltage value and a second current value, and/or a second discharge electric quantity value and a second charge electric quantity value.
According to one embodiment of the present invention, when the first parameter value at least includes the first discharging electric quantity value and the first charging electric quantity value, and the second parameter value at least includes the second discharging electric quantity value and the second charging electric quantity value, the driving range of the vehicle under test under a complete working condition cycle is obtained through the following model:
wherein S is the driving range of the tested vehicle under the complete working condition circulation, Edisc1 is the first discharge electric quantity value, Ec1 is the first charging electric quantity value, Edisc2 is the second discharge electric quantity value, Ec2 is the second charging electric quantity value, and Sn is the driving range of the tested vehicle in the N times of cycle tests.
According to an embodiment of the present invention, when the first parameter value includes the first voltage value and the first current value, and the second parameter value includes the second voltage value and the second current value, before estimating the driving range of the vehicle under test at a complete operating cycle according to the driving range of the vehicle under test at the N-cycle test and the first parameter value and the second parameter value, the method further includes: acquiring sampling frequency when the first parameter and the second parameter are acquired; and estimating the driving range of the tested vehicle under the complete working condition cycle according to the driving range of the tested vehicle under the N times of cycle tests, the sampling frequency, the first voltage value and the first current value, and the second voltage value and the second current value.
According to an embodiment of the invention, before controlling the vehicle under test to perform N times of cycle tests according to target test conditions by the vehicle chassis dynamometer, the method further comprises: and controlling the tested vehicle to run for a preset mileage at a first speed through the automobile chassis dynamometer.
According to one embodiment of the invention, the first vehicle speed is less than the maximum vehicle speed, and the preset mileage is 5 km.
According to an embodiment of the present invention, the reaching of the preset condition includes: and detecting that the actual vehicle speed error is greater than or equal to the highest vehicle speed when the accelerator pedal of the detected vehicle is stepped to the bottom.
According to one embodiment of the invention, the target test condition is a european fuel consumption and emission assessment standard NEDC test condition.
In order to achieve the above object, a system for testing the driving range of a pure electric vehicle according to a second aspect of the present invention includes: the system comprises a charging device, an automobile chassis dynamometer, a data acquisition system and a data processing system, wherein the charging device is used for charging a tested vehicle until a power battery in the tested vehicle is fully charged; the automobile chassis dynamometer is used for carrying out N times of cyclic tests on the tested vehicle installed on the automobile chassis dynamometer according to a target test working condition and recording the driving range of the tested vehicle during the N times of cyclic tests; the data acquisition system is used for acquiring a first parameter value of the power battery during the N times of cycle tests; the automobile chassis dynamometer is also used for testing the tested vehicle according to the highest speed of the tested vehicle until a preset condition is reached, and stopping the test; the data acquisition system is also used for acquiring a second parameter value of the power battery during the highest vehicle speed test; and the data processing system is used for estimating the driving range of the tested vehicle under the complete working condition cycle according to the driving range of the tested vehicle under the N times of cycle tests and the first parameter value and the second parameter value.
According to the system for testing the driving range of the pure electric vehicle, the tested vehicle can be charged by the charging device until the tested vehicle is fully charged, the dynamometer of the automobile chassis can perform test according to the target test working condition, the method comprises the steps of carrying out N times of cycle tests on a tested vehicle arranged on an automobile chassis dynamometer, recording the driving range of the tested vehicle during the N times of cycle tests, collecting a first parameter value of a power battery during the N times of cycle tests by a data collection system, and then, the automobile chassis dynamometer can also test the tested vehicle according to the highest speed of the tested vehicle until the tested vehicle stops testing when a preset condition is reached, the data acquisition system acquires a second parameter value of the power battery during the highest speed test, and the data processing system estimates the driving range of the tested vehicle under the complete working condition cycle according to the driving range of the tested vehicle during the N times of cycle tests, the first parameter value and the second parameter value. Compared with the traditional test mode, the test process is simplified, the driving range can be rapidly tested, the accuracy of the test result can be ensured, the repeatability is high, the operation is simple and convenient, and the test period and the cost are saved.
According to an embodiment of the invention, the first parameter value comprises a first voltage value and a first current value, and/or a first discharge electric quantity value and a first charge electric quantity value; the second parameter value includes a second voltage value and a second current value, and/or a second discharge electric quantity value and a second charge electric quantity value.
According to one embodiment of the present invention, when the first parameter value at least includes the first discharging electric quantity value and the first charging electric quantity value, and the second parameter value at least includes the second discharging electric quantity value and the second charging electric quantity value, the data processing system obtains the driving range of the vehicle under test under a complete working condition cycle through the following model:
wherein S is the driving range of the tested vehicle under the complete working condition circulation, Edisc1 is the first discharge electric quantity value, Ec1 is the first charging electric quantity value, Edisc2 is the second discharge electric quantity value, Ec2 is the second charging electric quantity value, and Sn is the driving range of the tested vehicle in the N times of cycle tests.
According to an embodiment of the present invention, when the first parameter value includes the first voltage value and the first current value, and the second parameter value includes the second voltage value and the second current value, the data processing system is further configured to obtain a sampling frequency when the data acquisition system acquires the first parameter and the second parameter, and estimate a driving range of the vehicle under test in a complete working condition cycle according to the driving range of the vehicle under test in the N-cycle tests, the sampling frequency, the first voltage value and the first current value, and the second voltage value and the second current value.
According to an embodiment of the invention, the vehicle chassis dynamometer is further used for controlling the vehicle to be tested to run for a preset mileage at a first speed before controlling the vehicle to be tested to perform N times of cycle tests according to the target test condition through the vehicle chassis dynamometer.
According to one embodiment of the invention, the first vehicle speed is less than the maximum vehicle speed, and the preset mileage is 5 km.
According to an embodiment of the present invention, the reaching of the preset condition includes: and detecting that the actual vehicle speed error is greater than or equal to the highest vehicle speed when the accelerator pedal of the detected vehicle is stepped to the bottom.
According to one embodiment of the invention, the target test condition is a european fuel consumption and emission assessment standard NEDC test condition.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which,
FIG. 1 is a flowchart of a method for testing driving range of a pure electric vehicle according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a system for testing the driving range of a pure electric vehicle according to one embodiment of the invention;
fig. 3 is a schematic structural diagram of a system for testing the driving range of a pure electric vehicle according to another embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a method and a system for testing the driving range of a pure electric vehicle according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for testing a driving range of a pure electric vehicle according to an embodiment of the present invention. It should be noted that the method for testing the driving range of the pure electric vehicle according to the embodiment of the present invention may be applied to a system for testing the driving range of the pure electric vehicle, where the system for testing the driving range of the pure electric vehicle may include a chassis dynamometer, a data acquisition system, and a data processing system, where the data processing system may be connected to the chassis dynamometer and the data acquisition system, respectively.
As shown in fig. 1, the method for testing the driving range of the pure electric vehicle may include:
and S101, charging the tested vehicle until a power battery in the tested vehicle is fully charged.
When the driving range of the pure electric vehicle is tested, the tested vehicle may be prepared first. That is, it can be understood that the tested vehicle needs to run in for a certain distance, wherein the running-in distance can refer to the definition of the vehicle enterprise or 3000 kilometers.
After the tested vehicle is prepared, the tested vehicle can be charged until the tested vehicle is fully charged, so that the driving range of the tested vehicle can be tested subsequently. It can be understood that the vehicle to be tested is a pure electric vehicle.
S102, the tested vehicle is mounted on the automobile chassis dynamometer, and the tested vehicle is controlled to carry out N times of cycle tests according to the target test working condition through the automobile chassis dynamometer.
It can be understood that the automobile chassis dynamometer can be used for testing the driving range of the pure electric automobile. The vehicle to be tested can be mounted on the automobile chassis dynamometer, and then a data acquisition system can be mounted and can be connected with the vehicle to be tested.
After the tested vehicle is installed on the automobile chassis dynamometer, the tested vehicle can be subjected to N times of cycle tests according to the target test working condition through the automobile chassis dynamometer, wherein N can be greater than or equal to 3. In addition, the target test condition may be, but is not limited to, a european fuel consumption and emission evaluation standard NEDC test condition. It is understood that the target test condition may include a stop, start, acceleration, deceleration, and other driving conditions.
S103, acquiring the driving range of the tested vehicle in the N times of cycle tests and the first parameter value of the power battery in the N times of cycle tests.
Specifically, after the tested vehicle is controlled to carry out N times of cycle tests according to the target test working condition through the automobile chassis dynamometer, the driving range Sn of the N times of cycles can be recorded through the automobile chassis dynamometer, and the first parameter value of the power battery of the N times of cycle tests can be collected through the data collection system. In an embodiment of the present invention, the first parameter value may include a first voltage value and a first current value, and/or an electric quantity value. Wherein, the electric quantity value can comprise a first discharging electric quantity value and a first charging electric quantity value.
It can be understood that the information included in the first parameter value may be determined by the information that can be collected by the data collection system, that is, if the data collection system can only collect the voltage and current information, the information included in the first parameter value is the voltage and current of the power battery; if the data collection system can at least collect the electric quantity, the first parameter value can at least include the electric quantity (i.e. the discharge electric quantity value and the charge electric quantity value) of the power battery.
And S104, controlling the tested vehicle to test according to the highest speed, and stopping the test until a preset condition is reached.
It should be noted that, in an embodiment of the present invention, the reaching of the preset condition may include: and detecting that the actual vehicle speed error is greater than or equal to the highest vehicle speed when the accelerator pedal of the detected vehicle is stepped to the bottom.
Specifically, after N times of cycle tests are carried out on the tested vehicle and the first parameter value of the power battery during the N times of cycle tests is collected, the tested vehicle can be controlled to carry out the test according to the highest vehicle speed through the automobile chassis dynamometer until the actual vehicle speed V error exceeds the highest vehicle speed V when the accelerator pedal of the tested vehicle is stepped on the bottommaxAnd when +/-2 km/h, stopping the test.
And S105, collecting a second parameter value of the power battery during the highest vehicle speed test.
Specifically, after the highest vehicle speed test is carried out on the tested vehicle, the driving range of the tested vehicle in the highest vehicle speed test can be recorded through the vehicle chassis dynamometer, and a second parameter value of the power battery in the highest vehicle speed test is acquired through the data acquisition system. In an embodiment of the present invention, the second parameter value may include a second voltage value and a second current value, and/or an electric quantity value. Wherein the electric quantity value may include a second discharging electric quantity value and a second charging electric quantity value.
It can be understood that the information included in the second parameter value may be determined by the information that can be collected by the data collection system, that is, if the data collection system can only collect the voltage and current information, the information included in the second parameter value is the voltage and current of the power battery; if the data collection system can at least collect the electric quantity, the second parameter value can at least include the electric quantity (i.e. the discharge electric quantity value and the charge electric quantity value) of the power battery.
And S106, estimating the driving range of the tested vehicle under the complete working condition cycle according to the driving range of the tested vehicle under the N times of cycle tests, the first parameter value and the second parameter value.
Specifically, the driving range of the tested vehicle in the N times of cycle tests recorded by the automobile chassis dynamometer and the first parameter value and the second parameter value of the power battery acquired by the data acquisition system can be acquired through the data processing system, and the driving range S of the tested vehicle in the complete working condition cycle can be estimated according to the driving range in the N times of cycle tests and the first parameter value and the second parameter value.
It can be understood that, since the information contained in the first parameter value and the second parameter value is related to the information that can be collected by the data collection system, that is, if the data collection system can only collect the information of voltage and current, the information contained in the first parameter value is the voltage and current of the power battery; if the data acquisition system can at least acquire the electric quantity, the first parameter value may at least include the electric quantity of the power battery (i.e., a discharge electric quantity value and a charge electric quantity value), and therefore, the driving range of the vehicle under test under a complete working condition cycle may be estimated in various ways, specifically as follows:
as an example, when the first parameter value at least includes the first discharging electric quantity value and the first charging electric quantity value, and the second parameter value at least includes the second discharging electric quantity value and the second charging electric quantity value, the driving range of the measured vehicle under the complete working condition cycle can be obtained through the following model:
wherein S is the driving range of the tested vehicle under the complete working condition cycle, Edisc1 is a first discharge electric quantity value, Ec1 is a first charging electric quantity value, Edisc2 is a second discharge electric quantity value, EcAnd 2 is a second charging electric quantity value, and Sn is the driving range of the tested vehicle in N times of cycle tests.
As another example, when the first parameter value includes a first voltage value and a first current value, and the second parameter value includes a second voltage value and a second current value, before estimating the driving range of the vehicle under test under a complete operating condition cycle according to the driving range of the vehicle under test under N-cycle tests, the first parameter value and the second parameter value, the test method may further include: and acquiring the sampling frequency when the first parameter and the second parameter are acquired. In the embodiment of the invention, the driving range of the tested vehicle under the complete working condition cycle is estimated according to the driving range, the sampling frequency, the first voltage value and the first current value, and the second voltage value and the second current value of the tested vehicle under the N times of cycle tests.
For example, if the data acquisition system can only acquire information of the voltage U and the current I, before estimating the driving range of the vehicle under test under a complete working condition cycle, the sampling frequency of the data acquisition system when acquiring the first parameter and the second parameter may be acquired, and then the electric quantity E of the power battery may be calculated according to the sampling frequency f, the acquired voltage value U and the acquired current value I of the power battery, as follows:
the electric quantity E is ∑ UIT;
the time T is 1/f.
Therefore, the electric quantity (comprising a first discharging electric quantity value and a first charging electric quantity value) of the power battery at the time of N times of cycle test and the electric quantity (comprising a second discharging electric quantity value and a second charging electric quantity value) of the power battery at the time of the highest vehicle speed test can be calculated through the formula.
And finally, estimating the driving range of the tested vehicle under the complete working condition cycle through the formula (1) according to the driving range of the tested vehicle under the N-time cycle tests, and the calculated first discharging electric quantity value and first charging electric quantity value, second discharging electric quantity value and second charging electric quantity value of the power battery.
In order to eliminate the measurement error as much as possible and improve the accuracy of the test result, further, in an embodiment of the invention, before controlling the vehicle under test to perform N times of cycle tests according to the target test condition by the chassis dynamometer, the test method may further include: and controlling the tested vehicle to run at a first speed for a preset mileage through the automobile chassis dynamometer. Wherein the first vehicle speed is less than the maximum vehicle speed, for example, the first vehicle speed may be 80% of the maximum vehicle speed; the preset mileage may be 5 km.
For example, before performing N times of cycle tests on the vehicle to be tested, the vehicle to be tested can be controlled to run for 5 kilometers at a speed of 80% of the maximum speed by the vehicle chassis dynamometer, so that the vehicle chassis dynamometer and the vehicle to be tested are preheated to eliminate measurement errors.
According to the method for testing the driving range of the pure electric vehicle, the tested vehicle can be charged firstly until the power battery in the tested vehicle is fully charged, and then, the tested vehicle can be arranged on the automobile chassis dynamometer and is controlled to carry out N times of cycle tests according to the target test working condition through the automobile chassis dynamometer, and collecting the driving range of the tested vehicle in the N times of cycle tests and the first parameter value of the power battery in the N times of cycle tests, then, the tested vehicle is controlled to test according to the highest vehicle speed, the test is stopped until a preset condition is reached, a second parameter value of the power battery is collected during the highest vehicle speed test, and finally, and estimating the driving range of the tested vehicle under the complete working condition cycle according to the driving range of the tested vehicle under the N times of cycle tests, the first parameter value and the second parameter value. Compared with the traditional test mode, the test process is simplified, the driving range can be rapidly tested, the accuracy of the test result can be ensured, the repeatability is high, the operation is simple and convenient, and the test period and the cost are saved.
In order to realize the embodiment, the invention further provides a system for testing the driving range of the pure electric vehicle.
FIG. 2 is a schematic structural diagram of a system for testing the driving range of a pure electric vehicle according to an embodiment of the invention. As shown in fig. 2, the system for testing the driving range of the pure electric vehicle may include: the charging device 100, the automobile chassis dynamometer 200, the data acquisition system 300 and the data processing system 400. In the embodiment of the present invention, as shown in fig. 1, the charging device 100 is connected to a vehicle 10 to be tested, the vehicle 10 to be tested is mounted on the chassis dynamometer 200, the data acquisition system 300 is connected to the vehicle 10 to be tested, and the data processing system 400 is respectively connected to the chassis dynamometer 200 and the data acquisition system 300.
When the driving range of the pure electric vehicle is tested, the tested vehicle may be prepared first. That is, it can be understood that the tested vehicle needs to run in for a certain distance, wherein the running-in distance can refer to the definition of the vehicle enterprise or 3000 kilometers.
The charging device 100 may be used to charge the vehicle 10 until the power battery in the vehicle 10 is fully charged. Specifically, the charging device 100 may charge the vehicle 10 until full, so as to continue the mileage test of the vehicle 10. It is understood that the vehicle 10 under test is a pure electric vehicle.
The vehicle chassis dynamometer 200 may be configured to perform N-time cycle tests on the vehicle 10 under test mounted on the vehicle chassis dynamometer 200 according to the target test condition, and record the driving range of the vehicle 10 under test during the N-time cycle tests. Specifically, the automotive chassis dynamometer 200 may perform N-cycle tests on the vehicle under test 10 mounted thereon according to the target test condition, where N may be greater than or equal to 3, and may record the driving range Sn of the N cycles. In the embodiment of the present invention, the target test condition may be, but is not limited to, a fuel consumption and emission evaluation standard NEDC test condition. It is understood that the target test condition may include a stop, start, acceleration, deceleration, and other driving conditions.
The data acquisition system 300 may be used to acquire a first parameter value of the power cell during the N-cycle test. Specifically, after the vehicle chassis dynamometer 200 performs N cycle tests on the vehicle 10 under test, the data acquisition system 300 may acquire the first parameter values of the power battery for the N cycle tests. In an embodiment of the present invention, the first parameter value may include a first voltage value and a first current value, and/or an electric quantity value. Wherein, the electric quantity value can comprise a first discharging electric quantity value and a first charging electric quantity value.
It is understood that the information included in the first parameter value may be determined by the information that the data acquisition system 300 can acquire, that is, if the data acquisition system 300 can only acquire the voltage and current information, the first parameter value includes the information of the voltage and current of the power battery; if the data collection system 300 is capable of collecting at least an electric quantity, the first parameter value may include at least an electric quantity (i.e., a discharge electric quantity value and a charge electric quantity value) of the power battery.
In the embodiment of the present invention, the vehicle chassis dynamometer 200 may further be configured to perform a test on the vehicle 10 under test according to the maximum vehicle speed of the vehicle 10 under test, stop the test until a preset condition is reached, and record the driving range of the vehicle 10 under test at the maximum vehicle speed. In an embodiment of the present invention, the reaching the preset condition may include: and detecting that the actual vehicle speed error is greater than or equal to the highest vehicle speed when the accelerator pedal of the detected vehicle 10 is stepped to the bottom.
Specifically, after the vehicle is tested for N times of cycle tests, the vehicle chassis dynamometer 200 may further control the vehicle to be tested to perform a test according to the highest vehicle speed until the actual vehicle speed V error exceeds the highest vehicle speed V when the accelerator pedal of the vehicle is stepped on to the bottommaxAnd when the speed is +/-2 km/h, stopping the test, and recording the driving range Sv of the tested vehicle 10 at the highest speed test.
In an embodiment of the present invention, the data collection system 300 may also be used to collect a second parameter value for the power battery at the highest vehicle speed test. Specifically, after the vehicle chassis dynamometer 200 performs the highest vehicle speed test on the vehicle under test, the data acquisition system 300 may acquire the second parameter value of the power battery of the highest vehicle speed test. Wherein, in an embodiment of the present invention, the second parameter value comprises a second voltage value and a second current value, and/or an electric quantity value. Wherein the electric quantity value may include a second discharging electric quantity value and a second charging electric quantity value.
It is understood that the information included in the second parameter value may be determined by the information that the data acquisition system 300 can acquire, that is, if the data acquisition system 300 can only acquire the voltage and current information, the second parameter value includes the information of the voltage and current of the power battery; if the data collection system 300 is capable of collecting at least an electric quantity, the second parameter value may include at least an electric quantity (i.e., a discharge electric quantity value and a charge electric quantity value) of the power battery.
The data processing system 400 may be configured to estimate the driving range of the vehicle 10 under test over a complete operating cycle based on the driving range of the vehicle 10 under test over the N cycles, and the first and second parameter values.
It can be understood that, since the information included in the first parameter value and the second parameter value is related to the information that can be collected by the data collection system 300, that is, if the data collection system 300 can only collect the information of the voltage and the current, the information included in the first parameter value is the voltage and the current of the power battery; if the data collection system 300 can at least collect the electric quantity, the first parameter value may at least include the electric quantity of the power battery (i.e. the discharge electric quantity value and the charge electric quantity value), and therefore, the driving range of the vehicle 10 under test under a complete working condition cycle may be estimated in various ways, specifically as follows:
as an example, when the first parameter value includes at least a first discharging electric quantity value and a first charging electric quantity value, and the second parameter value includes at least a second discharging electric quantity value and a second charging electric quantity value, the data processing system 400 obtains the driving range of the vehicle 10 under test for a complete duty cycle by the following model:
wherein S is the driving range of the tested vehicle 10 under the complete working condition cycle, Edisc1 is a first discharge electric quantity value, Ec1 is a first charging electric quantity value, Edisc2 is a second discharge electric quantity value, EcAnd 2 is a second charging electric quantity value, and Sn is the driving range of the tested vehicle 10 in N times of cycle tests.
As another example, when the first parameter value includes a first voltage value and a first current value, and the second parameter value includes a second voltage value and a second current value, the data processing system 400 may be further configured to obtain a sampling frequency when the data acquisition system 300 acquires the first parameter and the second parameter, and estimate the driving range of the vehicle 10 under the complete operating condition cycle according to the driving range of the vehicle 10 under the N-cycle test, the sampling frequency, the first voltage value and the first current value, and the second voltage value and the second current value.
For example, if the data acquisition system 300 can only acquire information of the voltage U and the current I, before estimating the driving range of the vehicle under test under a complete working condition cycle, the data processing system 400 may need to acquire the sampling frequency when the data acquisition system 300 acquires the first parameter and the second parameter, and then may calculate the electric quantity E of the power battery according to the sampling frequency f, the acquired voltage value U and the acquired current value I of the power battery, as follows:
the electric quantity E is ∑ UIT;
the time T is 1/f.
Therefore, the electric quantity (comprising a first discharging electric quantity value and a first charging electric quantity value) of the power battery at the time of N times of cycle test and the electric quantity (comprising a second discharging electric quantity value and a second charging electric quantity value) of the power battery at the time of the highest vehicle speed test can be calculated through the formula.
The data processing system 400 can estimate the driving range of the vehicle 10 under the complete working condition cycle by the above equation (1) according to the driving range of the vehicle 10 under the N-time cycle test, and the calculated first discharging electric quantity value and first charging electric quantity value, second discharging electric quantity value and second charging electric quantity value of the power battery.
In order to eliminate the measurement error as much as possible and improve the accuracy of the test result, further, in an embodiment of the present invention, the chassis dynamometer 200 may be further configured to control the vehicle 10 to travel a preset distance at the first speed before controlling the vehicle 10 to perform N-time cycle tests according to the target test condition by the chassis dynamometer 200. Wherein, in the embodiment of the present invention, the first vehicle speed is less than the maximum vehicle speed, for example, the first vehicle speed may be 80% of the maximum vehicle speed; the preset mileage may be 5 km.
For example, before the vehicle under test is tested for N times of cycle tests, the vehicle under test 200 may be controlled to run for 5 km at a speed of 80% of the maximum speed, so that the vehicle under test and the vehicle under test are preheated to eliminate the measurement error.
It should be noted that, in an embodiment of the present invention, the connection relationship between the charging device 100, the vehicle chassis dynamometer 200, the data acquisition system 300 and the data processing system 400 may also be as shown in fig. 3, that is, the charging device 100 is connected to the vehicle 10 to be tested, the vehicle 10 to be tested is mounted on the vehicle chassis dynamometer 200, the data acquisition system 300 is respectively connected to the vehicle chassis dynamometer 200 and the vehicle 10 to be tested, and the data processing system 400 is connected to the data acquisition system 300. That is, the data acquisition system 300 may be configured to acquire the voltage U, the current I, and the electric quantity E (i.e., the discharge electric quantity value and the charge electric quantity value) of the power battery, and may also acquire the driving range Sn of the vehicle 10 under test during N-cycle tests, which is recorded by the vehicle chassis dynamometer 200, and includes but is not limited to the on-vehicle CAN bus data, the external power analyzer, and other devices; the data processing system 400 may be used to analyze the data of the computing data collection system 300, including all tools capable of data processing, such as computers and the like.
According to the system for testing the driving range of the pure electric vehicle, the tested vehicle can be charged by the charging device until the tested vehicle is fully charged, the dynamometer of the automobile chassis can perform test according to the target test working condition, the method comprises the steps of carrying out N times of cycle tests on a tested vehicle arranged on an automobile chassis dynamometer, recording the driving range of the tested vehicle during the N times of cycle tests, collecting a first parameter value of a power battery during the N times of cycle tests by a data collection system, and then, the automobile chassis dynamometer can also test the tested vehicle according to the highest speed of the tested vehicle until the tested vehicle stops testing when a preset condition is reached, the data acquisition system acquires a second parameter value of the power battery during the highest speed test, and the data processing system estimates the driving range of the tested vehicle under the complete working condition cycle according to the driving range of the tested vehicle during the N times of cycle tests, the first parameter value and the second parameter value. Compared with the traditional test mode, the test process is simplified, the driving range can be rapidly tested, the accuracy of the test result can be ensured, the repeatability is high, the operation is simple and convenient, and the test period and the cost are saved.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method for testing the driving range of a pure electric vehicle is characterized by comprising the following steps:
charging a tested vehicle until a power battery in the tested vehicle is fully charged;
the tested vehicle is arranged on an automobile chassis dynamometer, and the tested vehicle is controlled to carry out N times of cycle tests according to the target test working condition through the automobile chassis dynamometer;
acquiring the driving range of the tested vehicle during the N times of cycle tests and a first parameter value of the power battery during the N times of cycle tests; the first parameter value comprises a first voltage value and a first current value, and/or a first discharging electric quantity value and a first charging electric quantity value;
controlling the tested vehicle to test according to the highest vehicle speed, and stopping the test until a preset condition is reached, wherein the reaching of the preset condition comprises the following steps: detecting that the actual vehicle speed exceeds the highest vehicle speed within an error range when an accelerator pedal of the detected vehicle is stepped to the bottom;
collecting a second parameter value of the power battery during the highest vehicle speed test; the second parameter value comprises a second voltage value and a second current value, and/or a second discharging electric quantity value and a second charging electric quantity value;
estimating the driving range of the tested vehicle under the complete working condition cycle according to the driving range of the tested vehicle under the N times of cycle tests and the first parameter value and the second parameter value;
when the first parameter value at least comprises the first discharging electric quantity value and the first charging electric quantity value, and the second parameter value at least comprises the second discharging electric quantity value and the second charging electric quantity value, the driving range of the tested vehicle under the complete working condition cycle is obtained through the following model:
wherein S is the driving range of the tested vehicle under the complete working condition circulation, Edisc1 is the first discharge electric quantity value, Ec1 is the first charging electric quantity value, Edisc2 is the second discharge electric quantity value, Ec2 is the second charging electric quantity value, and Sn is the driving range of the tested vehicle in the N times of cycle tests.
2. The method of claim 1, wherein when the first parameter value comprises the first voltage value and a first current value and the second parameter value comprises the second voltage value and a second current value, before estimating a range of the vehicle under test over a complete operating cycle based on the range of the vehicle under test over the N cycle tests and the first parameter value and the second parameter value, the method further comprises:
acquiring sampling frequency when the first parameter and the second parameter are acquired;
and estimating the driving range of the tested vehicle under the complete working condition cycle according to the driving range of the tested vehicle under the N times of cycle tests, the sampling frequency, the first voltage value and the first current value, and the second voltage value and the second current value.
3. The method according to any one of claims 1 to 2, wherein before controlling the vehicle under test by the vehicle chassis dynamometer according to target test conditions for N cycle tests, the method further comprises:
and controlling the tested vehicle to run for a preset mileage at a first speed through the automobile chassis dynamometer.
4. The method of claim 3, wherein the first vehicle speed is less than the maximum vehicle speed and the predetermined range is 5 kilometers.
5. The method of claim 1, wherein the target test condition is a fuel consumption and emissions assessment standard NEDC test condition.
6. The utility model provides a test system of pure electric vehicles driving range which characterized in that includes: a charging device, an automobile chassis dynamometer, a data acquisition system and a data processing system, wherein,
the charging device is used for charging the tested vehicle until the power battery in the tested vehicle is fully charged;
the automobile chassis dynamometer is used for carrying out N times of cyclic tests on the tested vehicle installed on the automobile chassis dynamometer according to a target test working condition and recording the driving range of the tested vehicle during the N times of cyclic tests;
the data acquisition system is used for acquiring a first parameter value of the power battery during the N times of cycle tests; the first parameter value comprises a first voltage value and a first current value, and/or a first discharging electric quantity value and a first charging electric quantity value;
the automobile chassis dynamometer is also used for testing the vehicle to be tested according to the highest speed of the vehicle to be tested, and stopping the test until a preset condition is reached, wherein the reaching of the preset condition comprises the following steps: detecting that the actual vehicle speed exceeds the highest vehicle speed within an error range when an accelerator pedal of the detected vehicle is stepped to the bottom;
the data acquisition system is also used for acquiring a second parameter value of the power battery during the highest vehicle speed test; the second parameter value comprises a second voltage value and a second current value, and/or a second discharging electric quantity value and a second charging electric quantity value;
the data processing system is used for estimating the driving range of the tested vehicle under the complete working condition cycle according to the driving range of the tested vehicle under the N times of cycle tests and the first parameter value and the second parameter value;
wherein, when the first parameter value at least comprises the first discharging electric quantity value and the first charging electric quantity value, and the second parameter value at least comprises the second discharging electric quantity value and the second charging electric quantity value, the data processing system obtains the driving range of the tested vehicle under the complete working condition cycle through the following model:
wherein S is the driving range of the tested vehicle under the complete working condition circulation, Edisc1 is the first discharge electric quantity value, Ec1 is the first charging electric quantity value, Edisc2 is the second discharge electric quantity value, Ec2 is the second charging electric quantity value, and Sn is the driving range of the tested vehicle in the N times of cycle tests.
7. The system of claim 6, wherein when the first parameter value comprises the first voltage value and the first current value and the second parameter value comprises the second voltage value and the second current value, the data processing system is further configured to obtain a sampling frequency when the data acquisition system acquires the first parameter and the second parameter, and estimate a driving range of the vehicle under test in a complete operating condition cycle according to the driving range of the vehicle under test in the N-cycle tests, the sampling frequency, the first voltage value and the first current value, and the second voltage value and the second current value.
8. The system according to any one of claims 6 to 7, wherein the vehicle chassis dynamometer is further configured to control the vehicle under test to travel a preset mileage at a first speed before controlling the vehicle under test to perform N number of tests of the cycle under target test conditions by the vehicle chassis dynamometer.
9. The system of claim 8, wherein the first vehicle speed is less than the maximum vehicle speed and the predetermined range is 5 kilometers.
10. The system of claim 6, wherein the target test condition is a fuel consumption and emissions assessment standard NEDC test condition.
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| CN108444497A (en) * | 2018-03-29 | 2018-08-24 | 北京新能源汽车股份有限公司 | Method for testing driving range of vehicle, chassis dynamometer and testing system |
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