CN112158079A - Intelligent load trailer and control method thereof - Google Patents
Intelligent load trailer and control method thereof Download PDFInfo
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- CN112158079A CN112158079A CN202011035324.0A CN202011035324A CN112158079A CN 112158079 A CN112158079 A CN 112158079A CN 202011035324 A CN202011035324 A CN 202011035324A CN 112158079 A CN112158079 A CN 112158079A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
- B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/423—Torque
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Abstract
The invention relates to the technical field of vehicle engineering, in particular to an intelligent load trailer and a control method thereof, the intelligent load trailer comprises a power motor, a gearbox and a drive axle which are in transmission connection, a power battery sequentially passes through a high-voltage distribution box and an inverter to supply power to the power motor, an intelligent control unit is connected with the inverter through a communication wire harness, and the intelligent control unit is connected with the upper computer and the test vehicle through the communication wire harness, the intelligent control unit can obtain the current parameters and the test parameters of the test vehicle when the test vehicle is in the test of the test road section, and calculates the resistance to be overcome when the test vehicle slides under the current parameters and the test parameters, controls the power motor to output the compensation torque through the inverter, the target working condition under the test parameters can be simulated by the test vehicle under the current working condition, a test field and a load do not need to be independently set, and the application range is wide.
Description
Technical Field
The invention relates to the technical field of vehicle engineering, in particular to an intelligent load trailer and a control method thereof.
Background
The whole vehicle road test is a key step of vehicle function and performance verification and quantification, and is an important link of whole vehicle development, and the convenience of the test process and the effectiveness of the test data directly relate to the effectiveness of the whole vehicle design, even the success or failure of the vehicle type design.
At present, the whole vehicle road test comprises real vehicle loading, specific road condition test and whole vehicle turn test table test. When the real vehicle loading and specific road condition test is carried out, the relevant road test is carried out at a specific gradient, frictional resistance and ambient temperature after the real vehicle finishes load matching, wherein the road state is limited by the influences of test site infrastructure and the like, all working conditions and user-defined special working conditions required by various tests cannot be compatible, and the test development is limited or cannot be carried out. The rotary test bed simulates the road state by placing the vehicle driving wheels on specific rotary stocks and applying driving force and braking force through the rotary stocks, and at the moment, because the rotary stock acting force only acts on the driving wheels, the dynamic test of the vehicle with the belt can not be carried out, and meanwhile, because of the zero rotating speed of non-driving wheels, the dynamic test such as an electronic braking system and a braking anti-lock system can not be carried out, and the test items are greatly limited.
Therefore, there is a need for an intelligent load trailer that can provide an adjustable braking torque or driving torque to a test vehicle to extend the test range of a vehicle road test.
Disclosure of Invention
The invention aims to: an intelligent load trailer and a control method thereof are provided to give a test vehicle adjustable braking torque or driving torque so as to extend a test range in a road test of the entire vehicle.
In one aspect, the present invention provides an intelligent load trailer comprising:
a drive axle;
the gearbox is in transmission connection with the drive axle through a transmission shaft;
the power motor is in transmission connection with the gearbox;
the inverter is connected with the power motor;
the high-voltage distribution box is connected with the inverter;
the power battery is connected with the high-voltage distribution box;
the intelligent control unit is connected with the inverter through a communication wire harness and is connected with the upper computer and the test vehicle through the communication wire harness, the intelligent control unit can acquire current parameters of the test vehicle in the test of the test road section, the current parameters comprise a real-time gradient, a real-time air resistance coefficient, a real-time load and a real-time rolling resistance coefficient, and the intelligent control unit can calculate the resistance F required to be overcome when the test vehicle slides under the current parametersfThe intelligent control unit can receive a test instruction sent by the upper computer, the test instruction comprises test parameters, the test parameters comprise one or more of target gradient, target load and target rolling resistance coefficient, the intelligent control unit can calculate resistance F of a test vehicle which needs to be overcome when the test vehicle slides under the test parameters on a test road section, and the intelligent control unit can control the inverter so that the power motor outputs torque FEDSSo that F isEDS，F＝Ff+FEDS。
As a preferable technical solution of the intelligent load trailer, the intelligent load trailer further includes a dc converter connected to the inverter and a battery connected to the dc converter.
As the preferable technical scheme of the intelligent load trailer, the intelligent load trailer also comprises a charging interface connected with the power battery.
As the preferable technical scheme of the intelligent load trailer, the intelligent load trailer further comprises a thermal management system, and the thermal management system is respectively connected with the power battery, the inverter and the power motor in a cooling mode through cooling water pipes.
As a preferred technical solution of the intelligent load trailer, the intelligent load trailer further comprises an electrical load connected to the high voltage distribution box.
As a preferable technical solution of the intelligent load trailer, the intelligent load trailer further comprises a battery management system connected with the power battery.
In another aspect, the present invention provides a method for controlling an intelligent-load trailer according to any one of the above aspects, including:
s100: the test vehicle performs a sliding test on the selected test road section according to the current parameters;
s201: calculating the driving force F of the test vehicle in real time at each mileage point of the test road sectiont，
Wherein T is the real-time output torque of the engine of the test vehicle, igFor testing the speed ratio of the transmission in a vehicle in a driving gear, irFor testing the speed ratio, R, of the main speed reducer of a drive axle of a vehiclerFor testing the radius of the driving wheel tyre of the vehicle;
s202: calculating the air resistance F of the test vehicle in real time at each mileage point of the test road sectionw，
Wherein, CDIs the air resistance coefficient, A is the frontal area of the test vehicle, VaTesting the relative speed of the vehicle speed and the current wind speed;
s203: calculating the acceleration resistance F of the test vehicle in real time at each mileage point of the test road sectionj，FjMa, where a is the acceleration of the test vehicle, the acceleration resistance coefficient, and m is the mass of the test vehicle;
s204: calculating the ramp resistance F of the test vehicle in real time at each mileage point of the test road sectioni，FiMgi, where g is acceleration of gravity and i is the real-time road slope;
s205: at each section of the test sectionMileage point real-time calculation test vehicle rolling resistance Ff，Ff＝Ft-Fw-Fi-Fj；
S206: according to formula FfMg (kv + b), where v is the current vehicle speed; k is a rolling resistance coefficient, b is a constant, and k and b of each mileage point in the whole test road section are corrected and recorded;
s300: obtaining a test instruction, and if the test parameter comprises a target gradient, and the target gradient at the current mileage point is isetIf the real-time gradient at the current mileage point is i, FEDS＝mg(iset-i) the test vehicle is coasting tested at the selected test section with the current parameters and the intelligent control unit controls the inverter to make the power motor output a torque FEDS。
As a preferred technical solution of the control method of the intelligent load trailer, in S300, if the test parameter includes a target rolling resistance coefficient, and the target rolling resistance coefficient value at the current mileage point is ksetReal-time rolling resistance coefficient value k at current mileage point, then FEDS＝mgv(kset-k)。
As a preferred technical solution of the control method of the intelligent load trailer, in S300, if the test parameter includes a target load, and the target load value at the current mileage point is msetWhen the current mileage point real-time load is m, FEDS＝(mset-m)(a+gv+i)。
As a preferable technical solution of the control method of the intelligent load trailer, the control method of the intelligent load trailer further includes, before S100:
s10: and confirming that the power battery and the power motor can work normally.
The invention has the beneficial effects that:
the invention provides an intelligent load trailer and a control method thereof. The gearbox is in transmission connection with the drive axle through a transmission shaft; the power motor is in transmission connection with the gearbox; the inverter is connected with the power motor; high-voltage distribution boxIs connected with the inverter; the power battery is connected with the high-voltage distribution box. The intelligent control unit is connected with the inverter through a communication wire harness, the intelligent control unit is connected with the upper computer and the test vehicle through the communication wire harness, the intelligent control unit can acquire current parameters of the test vehicle in a test road section, the current parameters comprise a real-time gradient, a real-time air resistance coefficient, a real-time load and a real-time rolling resistance coefficient, and the intelligent control unit can calculate the resistance F to be overcome when the test vehicle slides under the current parametersfThe intelligent control unit can receive a test instruction sent by the upper computer, the test instruction comprises test parameters, and the test parameters comprise one or more of target gradient, target load and target rolling resistance coefficient. The intelligent control unit can calculate the resistance F to be overcome when the test vehicle slides on the test road section under the test parameters, and the intelligent control unit can control the inverter to enable the power motor to output the torque FEDS，FEDS，F＝Ff+FEDS. The intelligent control unit can control the power motor to output compensation torque through the inverter according to the difference between the current parameter and the target parameter, so that the test vehicle can simulate the target working condition under the test parameter under the current working condition. And need not to set up test site and load alone, application scope is extensive.
Drawings
Fig. 1 is a schematic structural diagram of an intelligent load trailer according to an embodiment of the invention.
In the figure:
1. a drive axle; 2. a gearbox; 3. an inverter; 4. a power battery; 5. a high voltage wire harness; 6. a high voltage distribution box; 7. a DC converter; 8. a storage battery; 9. a power motor; 10. a drive shaft; 11. an intelligent control unit; 12. a cooling water pipe; 13. a thermal management system; 14. a battery management system; 15. a communication harness; 16. an electrical load; 17. and a charging interface.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, 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. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
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 accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1, the present embodiment provides an intelligent load trailer, which includes a drive axle 1, a transmission 2, a power motor 9, an inverter 3, a high-voltage distribution box 6, a power battery 4, and an intelligent control unit 11. The gearbox 2 is in transmission connection with the drive axle 1 through a transmission shaft 10; the power motor 9 is in transmission connection with the gearbox 2; the inverter 3 is connected with a power motor 9; the high-voltage distribution box 6 is connected with the inverter 3; the power battery 4 is connected with a high-voltage distribution box 6. The drive axle 1 is composed of a speed reducer, a differential, a half shaft and a wheel edge assembly. The power motor 9 is preferably a permanent magnet synchronous motor, the output end of which is directly connected with the input shaft of the gearbox 2, in other embodiments, the transmission shaft 10 can be eliminated, and the output end of the power motor 9 is directly connected with the reducer of the drive axle 1 in a transmission way. Power battery 4 is used for the storage electric energy, link to each other through high-voltage wire harness 5 between power battery 4 and the high-voltage distribution box 6, high-voltage distribution box 6 is used for controlling the break-make of different high-voltage circuit, link to each other through high-voltage wire harness 5 between high-voltage distribution box 6 and the inverter 3, power motor 9 and inverter 3 link to each other through three-phase line high-voltage wire harness, and both link to each other through the signal line communication, inverter 3 drives power motor 9 and generates electricity or starts, thereby power motor 9 can be to drive axle 1 output drive torque or braking torque, so that intelligent trailer load changes. When the power motor 9 is in a driving mode, the power battery 4 supplies electric energy to the inverter 3, and when the power battery 4 is in a braking mode, the power battery 4 can store the electric energy rectified by the inverter 3.
The intelligent control unit 11 is connected with the inverter 3 through a communication wire harness 15, the intelligent control unit 11 is connected with the upper computer and the test vehicle through the communication wire harness 15, the intelligent control unit 11 can obtain current parameters of the test vehicle in a test road section test, the current parameters comprise a real-time gradient, a real-time air resistance coefficient, a real-time load and a real-time rolling resistance coefficient, and the intelligent control unit 11 can calculate the resistance F to be overcome when the test vehicle slides under the current parametersfThe intelligent control unit 11 can receive a test instruction sent by the upper computer, and the test instruction comprisesTest parameters including one or more of a target grade, a target load, and a target rolling resistance coefficient. The intelligent control unit 11 can calculate the resistance F to be overcome when the test vehicle slides on the test road section under the test parameters, and the intelligent control unit 11 can control the inverter 3 to make the power motor 9 output the torque FEDS，F＝Ff+FEDS。
Specifically, the intelligent control unit 11 may obtain data including, but not limited to, the vehicle speed of the whole vehicle, the engine speed, the current gear of the transmission 2, the clutch state, the rear axle speed ratio, the tire radius, etc. from the test vehicle through the communication harness 15 to calculate the resistance to be overcome by the test vehicle when coasting under the current parameters. The intelligent control unit 11 can control the power motor 9 to output the compensation torque through the inverter 3 according to the difference between the current parameter and the target parameter, so that the test vehicle can simulate the target working condition under the test parameter under the current working condition. And need not to set up test site and load alone, application scope is extensive.
The control instruction can be stored in the upper computer in advance, when the test parameters comprise a target gradient, gradient loading test needs to be simulated, when the test parameters comprise a target load, load loading test needs to be simulated, and when the test parameters comprise a target rolling resistance coefficient, rolling resistance loading test needs to be carried out. Of course, when the test parameters include a plurality of the target gradient, the target load, and the target rolling resistance coefficient, simulation tests for a plurality of test items are required at the same time.
Optionally, the smart load trailer further comprises a dc converter 7 connected to the inverter 3 and a battery 8 connected to the dc converter 7. The direct current converter 7 is connected with the high-voltage distribution box 6 through a high-voltage wire harness 5 and is connected with the direct current converter 7 through a low-voltage wire harness, the direct current converter 7 realizes the conversion from the high-voltage electricity of the power battery 4 to the low-voltage electricity of the storage battery 8, and the storage battery 8 realizes the storage of the low-voltage electricity; the storage battery 8 is preferably a 24V lead-acid battery pack, and can also be a 12V lead-acid battery pack or other electric energy storage devices with other voltage grades.
Optionally, the intelligent load trailer further comprises a charging interface 17 connected with the power battery 4. The power battery 4 can be charged through the charging interface 17.
Optionally, the intelligent load trailer further comprises a thermal management system 13, and the thermal management system 13 is in cooling connection with the power battery 4, the inverter 3 and the power motor 9 through cooling water pipes 12. The intelligent control unit 11 receives temperature information of the power battery 4, the inverter 3 and other components, sends a control instruction to the thermal management system 13 through the communication wiring harness 15, the thermal management system 13 realizes temperature management of each power assembly, and each component works at the optimal working temperature, and the thermal management system 13 preferably adopts an air conditioner liquid cooling scheme or a forced liquid cooling scheme.
Optionally, the intelligent load trailer further comprises an electrical load 16 connected to the high voltage distribution box 6. When the power motor 9 is in the braking mode for a long time and the power battery 4 is fully charged due to capacity limitation, the electric load 16 consumes electric energy to continuously maintain the braking torque of the power motor 9, and meanwhile, the electric load 16 is provided with a certain heat dissipation device to keep the performance constant; the electrical load 16 is preferably cooled using an electric heater and associated heat sink to ensure a constant temperature of the electrical load 16 itself.
Optionally, the intelligent load trailer further comprises a battery management system 14 connected to the power battery 4. The battery management system 14 is used for detecting the state of the power battery 4, including battery state monitoring, battery core charge number estimation, state reporting, early warning and the like.
The intelligent control unit 11 is also connected with the inverter 3, the battery management system 14, the cooling system, the current converter and the like through the communication wiring harness 15, meanwhile, the communication wiring harness 15 is connected with the test vehicle, interaction of states and control signals of all parts is achieved, and the intelligent control unit 11 is a physical basis for achieving intelligent control strategies of the intelligent load trailer.
In this embodiment, the communication harness may enable the intelligent control unit 11 to communicate with the inverter 3 and the battery management system 14, and enable transmission of various status signals and control signals, including but not limited to a bus-type communication harness and a priority CAN bus. The intelligent control unit 11 structurally comprises an MCU, a gyroscope, a communication CAN, an IO signal interface, a high-speed CAN interface, a power supply and a crystal oscillator. The power supply and the crystal oscillator supply power and a clock circuit for the inside of the intelligent control unit 11, provide specific voltage electric energy for the inside circuit of the intelligent control unit 11, and provide accurate clock signals for the MCU; the gyroscope is used for judging the vehicle attitude, including but not limited to a vehicle pitch angle, a course angle and a roll angle; the communication CAN interface receives node message information from the communication CAN bus and outputs related control instructions to the CAN bus; the IO signal interface receives signals from the whole vehicle, including but not limited to a key door ON gear signal and an emergency stop signal; the high-speed CAN interface interacts with an upper computer, the interaction content comprises but is not limited to a test control instruction, torque and rotating speed information of a power motor 9, voltage and current information of a power battery 4, state information of a high-voltage distribution box 6, heat management load information and the like, and preferably, the high-speed CAN interface preferably uses a CCP protocol for information interaction; the MCU is a policy operation unit of the intelligent control unit 11, and receives module signals from the gyroscope, the communication CAN interface, the IO signal interface, the high-speed CAN interface, and the like, performs control operation, and outputs a control command to the communication CAN interface.
The embodiment further provides a control method of the intelligent load trailer, which includes:
s100: and the test vehicle performs the sliding test on the selected test road section according to the current parameters.
The test road section is a field for testing the performance of the vehicle. Because the intelligent load trailer can output braking and driving torque through the power motor 9 in the embodiment, the test road section has a wider selection range, and the influence of the test road section on the load loading test, the resistance loading test and the gradient loading test is small. The current parameters may be preset in the ECU of the test vehicle. In S100, the power motor 9 does not output torque.
S201: calculating the driving force F of the test vehicle in real time at each mileage point of the test road sectiont，
Wherein T is a test vehicleIn real time, igFor testing the speed ratio of the driving gear of the gearbox 2 of a vehicle, irFor testing the speed ratio, R, of the main reducer of the drive axle 1 of a vehiclerTo test the driven wheel tire radius of a vehicle. The intelligent control unit 11 CAN be in communication connection with an ECU (electronic control Unit) of the test vehicle through a CAN (controller area network) bus to acquire the real-time output torque of an engine of the test vehicle, the speed ratio of a running gear of a gearbox 2, the speed ratio of a main reducer of a drive axle 1 and the radius of a driving wheel tire, and the intelligent control unit 11 calculates the driving force F of the test vehicle during the sliding test according to the acquired real-time output torque of the engine of the test vehicle, the speed ratio of the running gear of the gearbox 2, the speed ratio of the main reducer of the drivet。
S202: calculating the air resistance F of the test vehicle in real time at each mileage point of the test road sectionw，
Wherein, CDIs the air resistance coefficient, A is the frontal area of the test vehicle, VaThe relative speed of the vehicle speed and the current wind speed is tested. The air resistance coefficient and the windward area of the test vehicle CAN be prestored in an upper computer or an ECU of the test vehicle, the intelligent control unit 11 CAN be in communication connection with the upper computer or the ECU of the test vehicle through a CAN bus to acquire the data, and the intelligent control unit 11 calculates the air resistance F of the test vehicle during the sliding test according to the acquired air resistance coefficient and the windward area of the test vehiclew。
S203: calculating the acceleration resistance F of the test vehicle in real time at each mileage point of the test road sectionj，FjWhere a is the acceleration of the test vehicle, the acceleration resistance coefficient, and m is the mass of the test vehicle. Wherein, the acceleration resistance coefficient CAN be prestored in an ECU of an upper computer or a test vehicle, the intelligent control unit 11 CAN be in communication connection with the ECU of the upper computer or the test vehicle through a CAN bus so as to acquire the data, and the intelligent control unit 11 calculates the air resistance F of the test vehicle during the sliding test according to the acquired mass, the acceleration resistance coefficient and the acceleration of the vehiclew。
S204: calculating the ramp resistance F of the test vehicle in real time at each mileage point of the test road sectioni，FiMgi, where g is the acceleration of gravity and i is the real-time road slope. The real-time road gradient can be detected by the gyroscope, and the intelligent control unit 11 can be in communication connection with the gyroscope to obtain the real-time road gradient during the vehicle sliding test and calculate the ramp resistance F of the vehicle according to the real-time road gradienti。
It is understood that, in steps S201 to S202, the intelligent control unit 11 needs to calculate and record the driving force F of the test vehicle at each mileage point in the test sectiontAcceleration resistance FjRamp resistance Fi. Specifically, the intelligent control unit 11 may integrate the vehicle speed in real time to obtain the current real-time test mileage value, and then obtain the driving force F of the test vehicle corresponding to each mileage point of the test road segmenttAcceleration resistance FjRamp resistance FiThe corresponding relationship chart of (1).
It should be noted that, when testing, the period of time during which the daily wind speed is stable may be selected so that the air resistance FwIt is considered to remain unchanged throughout the test.
S205: calculating the rolling resistance F of the test vehicle in real time at each mileage point of the test road sectionf，Ff＝Ft-Fw-Fi-Fj。
S206: according to formula FfMg (kv + b), where v is the current vehicle speed; k is a rolling resistance coefficient, b is a constant, and k and b of each mileage point in the whole test road section are corrected and recorded. The intelligent control unit 11 calculates and records the rolling resistance coefficient of the test vehicle at each mileage point in the test road segment.
S300: obtaining a test instruction, and if the test parameter comprises a target gradient, and the target gradient at the current mileage point is isetIf the real-time gradient at the current mileage point is i, FEDS＝mg(isetI) the test vehicle is coasting tested at the current parameters on the selected test section and the intelligent control unit 11 controls the inverter 3 to make the power motor 9 output the torque FEDS。
It can be understood that the target gradient isetThe real-time gradient i is a constant value, but the real-time gradient i may be a variable value or a constant value, depending on the specific road conditions of the tested road section, for example, the tested road section may include a straight road, a curved road, a ramp, etc., and the real-time gradient i is a variable value, so that the intelligent control unit 11 controls the inverter 3 to make the power motor 9 output the torque FEDSAnd the real-time gradient at each mileage point of the current test road section can be simulated into a target gradient for the change value, so that the simulated gradient loading test is realized.
Optionally, in S300, if the test parameter includes the target rolling resistance coefficient, and the target rolling resistance coefficient value at the current mileage point is ksetReal-time rolling resistance coefficient value k at current mileage point, then FEDS＝mgv(kset-k). Therefore, the real-time rolling resistance coefficient at each mileage point of the current test road section can be simulated into the target rolling resistance coefficient, and the simulated rolling resistance loading test is realized.
In S300, if the test parameters include the target load, and the target load value at the current mileage point is msetWhen the current mileage point real-time load is m, FEDS＝(mset-m) (a + gv + i). Therefore, the real-time load weight at each mileage point of the current test road section can be simulated into the target load, and the load loading simulation test is realized. It should be noted that the real-time load is constant throughout the test session.
Optionally, the method for controlling an intelligent-loaded trailer further comprises, before S100:
s10: and confirming that the power battery 4 and the power motor 9 can work normally. Specifically, the intelligent control unit 11 receives a power-on signal of the whole vehicle, and sends a power-on instruction to the battery management system 14, the inverter 3, the high-voltage distribution box 6, the thermal management system 13, and the like, so that the components are powered on and the self-checking operation is completed. Wherein the self-checking operation comprises: after the battery management system 14 is powered on, the intelligent control unit 11 collects signals including but not limited to the voltage of each cell, the temperature of a temperature sampling point, the current of a bus current sensor and the like of the power battery 4, estimates the state of charge and judges battery fault information at the same time, and reports the state information through the communication CAN; after the inverter 3 is powered on, acquiring information including but not limited to the temperature of the power motor 9, the rotating speed of the power motor 9, the temperature of the inverter 3, the voltage of the inverter 3, the current of the inverter 3, the real-time torque of the power motor 9 and the like, simultaneously judging the fault states of the power motor 9 and the inverter 3, and reporting the states through a communication CAN; after the high-voltage distribution box 6 is electrified, detection including but not limited to a relay, a fuse, high-voltage connection and insulation state is carried out, and state information is reported through a communication CAN.
The intelligent load trailer provided by the invention has the following beneficial effects:
1. the intelligent load trailer carries out target working condition configuration on the intelligent control unit 11 through the upper computer, and has high flexibility and test adaptability.
2. The power motor 9 of the intelligent load trailer can work in a driving and braking mode, the power battery 4 provides power electric energy for the whole system, the electric energy can be supplemented through the charging interface 17, meanwhile, the electric energy can be consumed through the electric load 16, and the requirement of long-time cycle testing is met.
3. The intelligent load trailer outputs driving torque or braking torque for compensation through the power motor 9, different load conditions of the intelligent load trailer can be simulated, and the adjustment of the real object load of the trailer is not needed in the experimental process;
4. the intelligent load trailer outputs driving torque or braking torque for compensation through the power motor 9, can simulate resistance conditions under different road conditions, and can perform rolling resistance loading test.
5. The intelligent load trailer outputs driving torque or braking torque for compensation through the power motor 9, can simulate road gradient conditions under different road conditions, and can perform gradient loading tests.
5. The intelligent control unit 11 can recognize the current road type of the vehicle according to the actual posture of the vehicle, and can automatically simulate the set target road equivalent resistance state on any road by compensating the driving resistance change caused by the road gradient and the adhesive force change through the driving torque and the braking torque.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An intelligent-loaded trailer, comprising:
a drive axle (1);
the gearbox (2) is in transmission connection with the drive axle (1) through a transmission shaft (10);
the power motor (9) is in transmission connection with the gearbox (2);
an inverter (3) connected to the power motor (9);
a high-voltage distribution box (6) connected to the inverter (3);
the power battery (4) is connected with the high-voltage distribution box (6);
the intelligent control unit (11) is connected with the inverter (3) through a communication wiring harness (15), the controller of the intelligent control unit (11) is connected with an upper computer and a test vehicle through the communication wiring harness (15), the intelligent control unit (11) can acquire current parameters of the test vehicle during testing on a test road section, the current parameters comprise a real-time gradient, a real-time air resistance coefficient, a real-time load and a real-time rolling resistance coefficient, and the intelligent control unit (11) can calculate resistance F required to be overcome when the test vehicle slides under the current parametersfThe intelligent control unit (11) can receive a test instruction sent by the upper computer, the test instruction comprises test parameters, the test parameters comprise one or more of target gradient, target load and target rolling resistance coefficient, the intelligent control unit (11) can calculate resistance F of a test vehicle which needs to be overcome when the test vehicle slides under the test parameters on a test road section, and the intelligent control unit (11) can control the inverter (3) so as to enable the power motor (9) to output torqueFEDS，F＝Ff+FEDS。
2. The intelligent load trailer according to claim 1, further comprising a dc converter (7) connected to the inverter (3) and a battery (8) connected to the dc converter (7).
3. The intelligent load trailer according to claim 1, further comprising a charging interface (17) connected to the power battery (4).
4. The intelligent load trailer according to claim 1, further comprising a thermal management system (13), wherein the thermal management system (13) is in cooling connection with the power battery (4), the inverter (3) and the power motor (9) through cooling water pipes (12).
5. The intelligent load trailer according to claim 1, further comprising an electrical load (16) connected to said high voltage distribution box (6).
6. An intelligent load trailer according to claim 1, further comprising a battery management system (14) connected to said power battery (4).
7. A control method for an intelligent-loaded trailer as claimed in any one of claims 1 to 6, comprising:
s100: the test vehicle performs a sliding test on the selected test road section according to the current parameters;
s201: calculating the driving force F of the test vehicle in real time at each mileage point of the test road sectiont，
Wherein T is the real-time output torque of the engine of the test vehicle,igfor testing the speed ratio of the driving gear of a gearbox (2) of a vehicle, irFor testing the main speed reducer ratio R of a drive axle (1) of a vehiclerFor testing the radius of the driving wheel tyre of the vehicle;
s202: calculating the air resistance F of the test vehicle in real time at each mileage point of the test road sectionw，
Wherein, CDIs the air resistance coefficient, A is the frontal area of the test vehicle, VaTesting the relative speed of the vehicle speed and the current wind speed;
s203: calculating the acceleration resistance F of the test vehicle in real time at each mileage point of the test road sectionj，FjMa, where a is the acceleration of the test vehicle, the acceleration resistance coefficient, and m is the mass of the test vehicle;
s204: calculating the ramp resistance F of the test vehicle in real time at each mileage point of the test road sectioni，FiMgi, where g is acceleration of gravity and i is the real-time road slope;
s205: calculating the rolling resistance F of the test vehicle in real time at each mileage point of the test road sectionf，Ff＝Ft-Fw-Fi-Fj；
S206: according to formula FfMg (kv + b), where v is the current vehicle speed; k is a rolling resistance coefficient, b is a constant, and k and b of each mileage point in the whole test road section are corrected and recorded;
s300: obtaining a test instruction, and if the test parameter comprises a target gradient, and the target gradient at the current mileage point is isetIf the real-time gradient at the current mileage point is i, FEDS＝mg(iset-i) the test vehicle is subjected to a coasting test with the current parameters on the selected test stretch, and the intelligent control unit (11) controls the inverter (3) so that the power motor (9) outputs a torque FEDS。
8. The method as claimed in claim 7, wherein in S300, if the parameter is testedComprises a target rolling resistance coefficient, and the target rolling resistance coefficient value under the current mileage point is ksetReal-time rolling resistance coefficient value k at current mileage point, then FEDS＝mgv(kset-k)。
9. The method as claimed in claim 7, wherein in S300, if the test parameter includes a target load, and the target load value at the current mileage point is msetWhen the current mileage point real-time load is m, FEDS＝(mset-m)(a+gv+i)。
10. The control method of the intelligent-loaded trailer according to claim 7, further comprising, before S100:
s10: and confirming that the power battery (4) and the power motor (9) can work normally.
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| CN202011035324.0A CN112158079A (en) | 2020-09-27 | 2020-09-27 | Intelligent load trailer and control method thereof |
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Cited By (1)
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