CN115855529A - Heat management test method and system based on chassis dynamometer and environmental bin - Google Patents
Heat management test method and system based on chassis dynamometer and environmental bin Download PDFInfo
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Abstract
The invention provides a heat management test method and a heat management test system based on a chassis dynamometer and an environmental chamber, which belong to the field of a whole vehicle cooling performance test method, and are used for installing a temperature sensor, a pressure sensor and a flowmeter required by a test; fixing the test sample car on a chassis dynamometer, connecting and debugging a sensor and a data acquisition system, and opening an environment bin after confirming that data transmission and acquisition are correct; after preheating of the test sample car and the chassis dynamometer, a sliding test is carried out, road sliding resistance coefficients a, b and c are respectively input into the chassis dynamometer, the sample car is placed in a neutral gear state, the chassis dynamometer automatically drags the sample car to 100km0h, then the sample car freely slides to 0km0h for three times, consistency of sliding data curves is checked after sliding is finished, and one of three groups, which has the smallest error and requires time error within +/-3%, is selected; and testing the heat management performance of the whole vehicle under the steady-state test working condition and the transient test working condition after the sliding is finished.
Description
Technical Field
The invention belongs to the field of a test method for cooling performance of a whole vehicle, and particularly relates to a heat management test method and system based on a chassis dynamometer and an environmental chamber.
Background
Thermal management is an important index for considering the tolerance degree of the whole vehicle to the actual environment, and simultaneously provides data support for reducing oil consumption, a general whole vehicle thermal management test is usually carried out on an actual road, and because the test working condition is severe, the driving safety is poor and potential safety hazards exist in the test process due to the limit of the test environment required by the whole vehicle road thermal management test; because the environmental factors are uncontrollable on an outdoor road, particularly the air temperature, the environmental humidity, the air speed and the like, and because the environmental factors cannot be controlled, the test environment consistency of the same working condition is poor, and the repeatability verification degree of the test data of the same environmental condition is not high.
In the prior art, CN201410444352.6 discloses an indoor testing device and method for vehicle heat balance capacity, wherein the file comprises a chassis dynamometer, an environment bin equipped with a temperature control system, a cooling fan and a temperature data acquisition system; the file is used for installing sensors of water inlet and outlet of an engine, water inlet and outlet of a radiator, ambient temperature and the like on the whole vehicle, and debugging is carried out through a temperature data acquisition system, so that effective and stable data of all the sensors are ensured. And (3) driving the whole vehicle with the sensor on a chassis dynamometer, centering, fixing the non-driving wheel or the vehicle body of the whole vehicle by using a fixing device of the chassis dynamometer, enabling an air outlet of the cooling fan to face an air inlet grid of the whole vehicle, and adjusting the distance from the cooling fan to the air inlet grid to be 0.6-1 m. And adjusting the temperature of the environmental chamber to be the temperature required by the thermal balance test. And starting the engine after the whole vehicle is soaked for more than 4 hours, and heating the vehicle. The chassis dynamometer of the document is loaded according to the maximum total mass of a vehicle, the chassis dynamometer is adjusted to be in a constant speed mode, the vehicle speed corresponding to the rotating speed of the maximum torque point of an engine is obtained by calculating the whole vehicle gearbox and the transmission ratio, and the vehicle speed is adjusted in place. The engine throttle is fully opened, whether the engine water outlet temperature of the temperature data acquisition system is stable or not is observed, the last stable 15-minute data is recorded, and the stability requirement is that the temperature change rate is 0.5 ℃/10 minutes. The file tests the matching and requirements of the whole vehicle engine and a cooling system based on the maximum power point, the temperature of the engine inlet and outlet water of the maximum torque point and the temperature of the radiator inlet and outlet water. Although the file is tested in an indoor environment, the resistance and the resistance coefficient of road sliding cannot be matched when the file is tested, and the influence of various parameters such as the head-on wind speed and the like on a sample car cannot be referred, so that the error of test result data is large, the test requirements cannot be met, and the data guarantee cannot be provided for the whole car development.
Disclosure of Invention
The invention provides a heat management test method based on a chassis dynamometer and an environmental chamber, which can solve the problems of poor driving safety, uncontrollable test environment and test conditions, poor test data repeatability and the like in a whole vehicle road heat management test.
The method comprises the following steps:
s11, installing a temperature sensor, a pressure sensor and a flowmeter required by the test;
s12, fixing the test sample car on a chassis dynamometer, connecting a sensor and a data acquisition system, debugging, and starting an environment bin after confirming that data transmission and acquisition are correct, wherein the set temperature of the environment bin is 32-37 ℃;
s13, after preheating of the test sample vehicle and the chassis dynamometer is finished, a sliding test is carried out, and F = av is provided based on resistance force provided by road sliding 2 + bv + c, the road sliding resistance coefficients a, b and c are respectively input into a chassis dynamometer, and the wind speed V of the head-on fan is V = n 2 v 2 +n 1 v+n 0 Setting the speed v to follow, placing the sample car in a neutral gear state, automatically dragging the sample car to 100km/h by a chassis dynamometer, then freely sliding to the speed of 0km/h for three times, checking the consistency of sliding data curves after sliding is finished, and selecting the time errors required by sliding in three groupsA group within ± 3% with the smallest error;
and S14, testing the heat management performance of the whole vehicle under the steady-state test working condition and the transient test working condition after the sliding is finished.
Further, in the method, after the set temperature of the environmental chamber is 32-37 ℃ and is stable, preheating is carried out on the test sample car and the chassis dynamometer;
the preheating mode is that the test sample vehicle runs on the chassis dynamometer to 80% of the maximum vehicle speed for at least 30 minutes, and the temperature of the rear axle reaches 60% of the maximum allowable temperature of the rear axle gear oil;
if the two continuous test working conditions are carried out, the temperature of the rear axle meets 60% of the maximum allowable temperature of the rear axle gear oil, and then the hot vehicle is not needed.
It should be further noted that in S11, 2 temperature sensors are installed at each temperature measurement point, and the temperature sensors are of a K-type thermocouple, and at least 1 pressure sensor is installed at each pressure measurement point.
It should be further noted that, in the S14, when the constant-speed fuel consumption test is performed, the accelerator pedal should be stabilized after the test sample vehicle reaches a fixed gear and a fixed vehicle speed, so that the vehicle speed is not more than ± 0.1km/h, and data recording is started when the engine water temperature and the cooling water flow are stabilized for 1 minute and the temperature difference between the engine water temperature and the engine water temperature is not more than ± 0.5 ℃.
It should be further noted that the constant-speed oil consumption test is to record a group of data for each running fixed phase of the test sample vehicle at the same distance, record at least three groups of effective data for one speed point, record the same running fixed distance for each speed point when recording data, record three groups of hundred kilometer oil consumption data as effective when not more than 1%, and record engine system parameters, temperature and pressure data of each measuring point, flow rate of a flow meter and fuel temperature in real time.
Further, in the step S14, a chassis dynamometer is used for performing a maximum climbing gradient test, the chassis dynamometer sequentially increases the gradient by 0.2% of the gradient, and the amplitude of gradient change is adjusted after the accelerator is completely closed until the target rotating speed is unchanged;
and after the water outlet temperature of the engine and the flow of cooling water are stabilized for 1 minute and the temperature difference of the water outlet temperature of the engine is less than or equal to +/-0.5 ℃, starting to record data, and recording system parameters of the engine, the temperature and pressure of each measuring point, the flow of a flowmeter, the temperature of fuel oil, the speed of the vehicle and the gradient in real time.
It should be further noted that in S14, when the vehicle thermal management test is performed under a steady-state operating condition, the constant-speed oil consumption test and the maximum climbing gradient test are selected, and when the vehicle thermal management test is performed under a transient operating condition, the CHTC and C-WTVC circulation operating conditions are selected.
It should be further noted that in S14, the transient operating condition selects a CHTC cycle operating condition and a C-WTVC cycle operating condition, and in the test process, the engine parameter data, the water temperature, the cooling water flow, the temperature and pressure parameters of each measurement point of the sensor, the oil consumption and the oil temperature are recorded in real time, and the test data of the transient test cycle operating condition are recorded, and three groups of hundred kilometers of oil consumption of which the oil consumption is not more than 1% are recorded as effective data.
The invention also provides a heat management test system based on the chassis dynamometer and the environmental bin, which comprises: the system comprises a temperature sensor, a pressure sensor, a flowmeter, a preheater, a chassis dynamometer and a test terminal machine;
the test terminal is provided with a CAN acquisition module, a data storage module, a data analysis module and a data display module;
the data acquisition module is respectively connected with the temperature sensor, the pressure sensor and the flowmeter and used for receiving temperature information, pressure information and water flow information in the test process;
the CAN acquisition module is connected with the vehicle control unit to acquire data information of the test sample vehicle in the test process;
the chassis dynamometer is used for fixing a test sample car and is based on F = av 2 + bv + c provides road sliding resistance, and the road sliding resistance coefficients a, b and c and the wind speed V of the head-on fan are set according to V = n 2 v 2 +n 1 v+n 0 Setting a speed v to follow, placing the sample car in a neutral gear state, automatically dragging the sample car to 100km/h by a chassis dynamometer, then freely sliding to a speed of 0km/h for three times, checking the consistency of a sliding data curve after sliding is finished, and selecting one group of three groups with a time error required by sliding within +/-3% and a minimum error;
the preheater is used for heating the ambient cabin temperature to 32-37 ℃;
the data storage module is used for storing test process data information and test result information;
the data analysis module is used for analyzing the data information of the test process to obtain a final test conclusion;
the data display module is used for displaying the data information of the test process and the test result information.
It should be further noted that the information collected by the data collection module includes: the air inlet temperature and the water outlet temperature of the engine, the inlet temperature and the outlet temperature of the intercooler, the air inlet temperature after air filtration, the ambient temperature and the rear axle temperature; the pressure measuring points comprise the air inlet pressure and the air outlet pressure of the engine, the air inlet pressure and the air outlet pressure of the intercooler, the pressure of the expansion water tank, the air inlet pressure and the air outlet back pressure after air filtration.
According to the technical scheme, the invention has the following advantages:
compared with road tests, the chassis dynamometer and environment bin-based thermal management test method for the whole vehicle has the advantages of high driving safety, complete controllability of the same test working condition state, strong controllability of test environment conditions, accurate test data and convenience and quickness in data repeatability verification, the chassis dynamometer can accurately simulate the road driving resistance matched with the sample vehicle, the influence of various parameters such as the head-on wind speed and the like on the sample vehicle is referred, various parameters in the vehicle test can be recorded in real time, data guarantee is provided for the whole vehicle development, the development efficiency is improved, the precision of test result data is guaranteed, and the test requirements are met.
The invention can also gather the data information and the test result information of the test process, thereby being convenient for the test personnel to look up and effectively improving the monitoring efficiency of the test process. The test data can be efficiently collected, stored and processed, and the whole test process can be described by using a multidimensional space. The quality and the efficiency of the vehicle test are improved, the data abnormality of the vehicle in the test process is found in time, the management level and the efficiency of the test process are improved, the risk of the vehicle manufacturing process is controlled, and the timeliness and the scientificity of the supervision, the management and the control of the whole test process are realized.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a flow chart of a thermal management test method based on a chassis dynamometer and an environmental chamber;
FIG. 2 is a schematic diagram of a thermal management test system based on a chassis dynamometer and an environmental bin;
FIG. 3 is a schematic diagram of an embodiment of a thermal management testing system based on a chassis dynamometer and an environmental chamber.
Description of reference numerals: a-an environment bin, B-a chassis dynamometer, C-a test sample car and D-a head-on fan.
Detailed Description
The invention provides a heat management test method based on a chassis dynamometer and an environmental warehouse, which aims to solve the problems that in the prior art, the test performed by using an outdoor road is easily influenced by environmental factors, the environmental factors cannot be controlled, the test environment consistency of the same working condition is poor, and the test data of the same environmental condition can be repeatedly verified to a low degree. Then, the heat management test method based on the chassis dynamometer and the environmental chamber provided by the invention is used as a test chamber in an indoor environmental chamber for testing, and technologies such as a sensor, a special artificial intelligence chip, cloud computing, distributed storage, a big data processing technology, an operation/interaction system, electromechanical integration and the like are utilized. The present invention also incorporates computer program code, including but not limited to object oriented programming languages such as Java, smalltalk, C + +, as well as conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the testing terminal as a stand-alone software package. The testing terminal of the invention can also be a remote computer which is connected to the testing equipment through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), to carry out remote testing operation.
Therefore, the invention can accurately simulate the road running resistance matched with the sample vehicle by matching the chassis dynamometer with the environmental bin, establishing test conditions and test working conditions, utilizing the technologies of sensor monitoring, data transmission and the like, can record various parameters of the vehicle during test in real time, provides data guarantee for the whole vehicle development and improves the development efficiency.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 2 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
Here, the state inspection of the test specimen C is explained. Sample car inspection according to the sample car inspection table: the sample car configuration is consistent with the test outline, the running-in mileage, the appearance, the tire, the engine oil level, the antifreeze liquid level, the fuel tank oil level, the urea liquid level, the existence of leakage, the engine condition, the air conditioner, the cigarette lighter, the mudguard, the counterweight block, the storage battery and the running inspection.
It is further noted that the running-in mileage needs to meet the standard requirements. Tire: the wear is perfect and normal, and the air pressure meets the technical requirements. The balancing weight is used for balancing 2-4 tons of load above the driving axle of the sample car according to the test requirement. And (3) running inspection: and the park runs for at least 20 minutes, and the engine transmission, the drive axle, the steering device and the braking device run normally.
One possible example is given below to illustrate, without limitation, a specific embodiment thereof. The whole vehicle thermal management test method comprises the following steps:
step S11: and installing a temperature sensor, a pressure sensor and a flowmeter required by the test. The temperature measuring points comprise the inlet and outlet water temperatures of the engine, the inlet and outlet air temperatures of an intercooler, the inlet air temperature after air filtration, the ambient temperature and the rear axle temperature; the pressure measuring points comprise the air inlet pressure and the air outlet pressure of the engine, the air inlet pressure and the air outlet pressure of the intercooler, the pressure of the expansion water tank, the air inlet pressure and the air outlet back pressure after air filtration.
In the embodiment of the invention, the accuracy and the safety of test data are ensured, 2 temperature sensors are arranged at the same position of each temperature measuring point, the temperature sensors are in a K-type thermocouple type, at least 1 pressure sensor is arranged at each pressure measuring point, and meanwhile, the temperature and pressure measuring points can be increased according to requirements, so that the measuring points cannot be reduced on the basis.
Step S12: the test sample car C is fixed on the chassis dynamometer B, the sensor and the data acquisition system are connected and debugged, and the environment bin A is opened after the data transmission and acquisition are confirmed to be correct, the set temperature of the environment bin A is 32-37 ℃, and the preferred temperature is 35 ℃. And after the temperature of the environmental chamber A reaches 35 ℃ and is stable, preheating the test sample vehicle C and the chassis dynamometer B in a mode that the test sample vehicle C runs on the chassis dynamometer B to 80% of the highest vehicle speed for at least 30 minutes, and simultaneously, the temperature of the rear axle reaches 60% of the maximum allowable temperature of the rear axle gear oil.
Step S13: after the test sample car C and the chassis dynamometer B are preheated, firstly, a sliding test is carried out, road sliding resistance coefficients a, B and C are respectively input into the chassis dynamometer B based on resistance F = av2+ bv + C provided by road sliding, the speed V of an oncoming fan D is set to be a speed V following according to V = n2V2+ n1V + n0, at the moment, the test sample car C is placed in a neutral gear state, the sample car is automatically dragged to 100km/h by the chassis dynamometer B, then the speed is freely slid to 0km/h, the sliding is carried out for three times, data are valid, the consistency of a sliding data curve is checked after the sliding is finished, and one group of three groups, in which the time error required by sliding is within +/-3% and the error is the minimum, is selected.
Step S14: and testing the heat management performance of the whole vehicle under the steady-state test working condition and the transient test working condition after the sliding is finished.
The test method provided by the invention is characterized in that a hot vehicle is carried out before the test, and a constant-speed oil consumption test and a maximum climbing gradient test are selected under a steady-state working condition.
When a constant-speed oil consumption test is carried out, the state of a test sample car C is a fixed gear, a fixed speed and a fixed gradient, when the test sample car C reaches a gear and a car speed required by the test, a test driver stably holds an accelerator pedal to enable the car speed not to exceed +/-0.1 km/h, the water temperature, the fan rotating speed, the cooling water flow rate of an engine of the test sample car C are monitored in real time, parameters of each measuring point of a distributed sensor, oil consumption and oil temperature are monitored, data are recorded after the water temperature and the cooling water flow rate of the engine are stable, the constant-speed oil consumption test records a group of data for each fixed phase of running of the test sample car C at the same distance, at least three groups of effective data are recorded for one speed point, and the oil consumption per hundred kilometer is not more than 1 percent and is effective; when the maximum climbing slope test is carried out, a fixed gear and a fixed rotating speed are used, a test sample car C is firstly increased to the fixed gear and the fixed rotating speed, the input slope of a chassis dynamometer B is increased by 0.2%, a test driver increases the opening degree of an accelerator to maintain the rotating speed unchanged until the opening degree of the accelerator reaches 100%, the adjustment is stopped after the slope is adjusted until the rotating speed and the car speed are stable, various data parameters of the test sample car C are monitored in real time, data are recorded until the water outlet temperature of an engine and the cooling water flow are stable, a set of data are recorded when the test sample car C runs for a fixed distance, and only one set of data needs to be recorded. The CHTC and C-WTVVC cycle working conditions are selected when transient test working conditions are carried out, a test driver drives according to a cycle working condition road spectrum, engine data, water temperature, cooling water flow, parameters of each measuring point of a sensor, oil consumption and oil temperature are recorded in real time, three groups of effective data need to be recorded in the transient test cycle working condition test data, and the oil consumption of one hundred kilometers is effective and is not more than 1%.
The data of the sensors are acquired by a data acquisition module, the parameters of the whole vehicle and the parameters of the engine are acquired by a CAN acquisition module, and all data are stored by a data storage module and analyzed by a data analysis module to finally obtain a conclusion.
The heat management test method and the heat management test system based on the chassis dynamometer and the environmental chamber can be used for archiving and storing test process data information and test result information.
Configuring test process data information and a test result information operation interface, so that a tester adds test data information which is not stored or configured in the system; or modifying or deleting the stored test data information. The test result data may be displayed for reference by an operator based on a bar chart, or a graph, or a data list.
The invention can collect the data information and the test result information of the test process, is convenient for the test personnel to look up, and effectively improves the monitoring efficiency of the test process. The test data can be efficiently collected, stored and processed, and the whole test process can be described by using a multidimensional space. The quality and efficiency of the vehicle test are improved, data abnormality of the vehicle in the test process is found in time, the management level and efficiency of the test process are improved, risks in the vehicle manufacturing process are controlled, and timeliness and scientificity of supervision, management and control of the whole test process are achieved.
The following is an embodiment of a thermal management test system based on a chassis dynamometer and an environmental chamber, which is provided by the embodiment of the present disclosure, and belongs to the same inventive concept as the thermal management test method based on the chassis dynamometer and the environmental chamber of the above embodiments.
As shown in fig. 3, the system includes: the system comprises a temperature sensor, a pressure sensor, a flowmeter, a preheater, a chassis dynamometer and a test terminal machine;
the test terminal is provided with a data acquisition module, a CAN acquisition module, a control module, a data storage module, a data analysis module and a data display module;
the data acquisition module is respectively connected with the temperature sensor, the pressure sensor and the flowmeter and used for receiving temperature information, pressure information and water flow information in the test process;
the CAN acquisition module is connected with the vehicle control unit to acquire data information of the test sample vehicle in the test process;
the chassis dynamometer is used for fixing a test sample car, and the chassis dynamometer is based on F = av 2 + bv + c provides road sliding resistance, and the road sliding resistance coefficients a, b and c and the wind speed V of the head-on fan are set according to V = n 2 v 2 +n 1 v+n 0 Setting the speed v to follow, placing the sample car in a neutral gear state, automatically dragging the sample car to 100km/h by a chassis dynamometer, then freely sliding to the speed of 0km/h for three times, checking the curve consistency of the sliding data after the sliding is finished and carrying out the testSelecting one group of the three groups, wherein the error of the time required by sliding is within +/-3% and the error is the minimum;
the preheater is used for heating the ambient cabin temperature to 32-37 ℃;
the data storage module is used for storing test process data information and test result information;
the data analysis module is used for analyzing the data information of the test process to obtain a final test conclusion;
the data display module is used for displaying the data information of the test process and the test result information.
The information collected by the data collection module comprises: the air inlet temperature and the air outlet temperature of the engine, the inlet temperature and the outlet temperature of the intercooler, the air inlet temperature after air filtration, the ambient temperature and the rear axle temperature; the pressure measuring points comprise the air inlet pressure and the air outlet pressure of the engine, the air inlet pressure and the air outlet pressure of the intercooler, the pressure of the expansion water tank, the air inlet pressure and the air outlet back pressure after air filtration.
Compared with road tests, the chassis dynamometer and environment bin based thermal management test system for the whole vehicle has the advantages that the driving safety is high, the same test working condition state is completely controllable, the test environment condition controllability is strong, the test data are accurate, and the data repeatability verification is convenient and fast.
The elements and algorithm steps of the various examples described in connection with the embodiments disclosed in the thermal management test system of the present invention may be embodied in electronic hardware, computer software, or combinations of both, and the components and steps of the various examples have been described in a functional generic manner in the foregoing description for clarity of hardware and software interchangeability. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A heat management test method based on a chassis dynamometer and an environmental chamber is characterized by comprising the following steps:
s11, installing a temperature sensor, a pressure sensor and a flowmeter required by the test;
s12, fixing the test sample car on a chassis dynamometer, connecting a sensor and a data acquisition system, debugging, and starting an environment bin after confirming that data transmission and acquisition are correct, wherein the set temperature of the environment bin is 32-37 ℃;
s13, after preheating of the test sample vehicle and the chassis dynamometer is finished, a sliding test is carried out, and F = av is provided based on resistance force provided by road sliding 2 + bv + c, road sliding resistance coefficients a, b and c are respectively input into the chassis dynamometer, and the wind speed V of the head-on fan is V = n 2 v 2 +n 1 v+n 0 Setting a speed v to follow, wherein the sample car is placed in a neutral gear state, the sample car is automatically dragged to 100km/h by a chassis dynamometer, then freely slides to the speed of 0km/h for three times, the consistency of a sliding data curve is checked after the sliding is finished, and one of three groups with the minimum error and the time error required by the sliding within +/-3 percent is selected;
and S14, testing the heat management performance of the whole vehicle under the steady-state test working condition and the transient test working condition after the sliding is finished.
2. The chassis dynamometer and environmental bin based thermal management test method of claim 1,
in the method, after the set temperature of the environmental chamber is 32-37 ℃ and is stable, preheating a test sample car and a chassis dynamometer;
the preheating mode is that the test sample vehicle runs on the chassis dynamometer to 80% of the maximum vehicle speed for at least 30 minutes, and the temperature of the rear axle reaches 60% of the maximum allowable temperature of the rear axle gear oil;
if the two continuous test working conditions are carried out, the temperature of the rear axle meets 60 percent of the maximum allowable temperature of the rear axle gear oil, and then the vehicle does not need to be heated.
3. The chassis dynamometer and environmental bin based thermal management test method of claim 1,
in S11, each temperature measuring point is provided with 2 temperature sensors, the temperature sensors are K-type thermocouples, and each pressure measuring point is provided with at least 1 pressure sensor.
4. The chassis dynamometer and environmental bin based thermal management test method of claim 1,
and S14, when the constant-speed oil consumption test is carried out, stabilizing the accelerator pedal after the test sample vehicle reaches a fixed gear and a fixed vehicle speed to ensure that the vehicle speed does not exceed +/-0.1 km/h, and starting to record data when the outlet water temperature of the engine and the cooling water flow are stabilized for 1 minute and the temperature difference of the outlet water temperature of the engine is not more than +/-0.5 ℃.
5. The chassis dynamometer and environmental bin based thermal management test method of claim 4,
the constant-speed oil consumption test is characterized in that a group of data is recorded for each fixed phase and same distance of running of a test sample vehicle, at least three groups of effective data are recorded for one speed point, the fixed distance of running needs to be the same when the data is recorded for each speed point, the three groups of hundred kilometer oil consumption data are effective when the data is not more than 1%, and engine system parameters, temperature and pressure data of each measuring point, flow rate of a flowmeter and fuel temperature are recorded in real time.
6. The chassis dynamometer and environmental bin-based thermal management test method according to claim 1, wherein in S14, the chassis dynamometer is used for performing a maximum climbing gradient test, the chassis dynamometer sequentially increases the gradient by 0.2% and adjusts the gradient change amplitude after the accelerator is grounded so that the target rotating speed is unchanged;
and after the water outlet temperature of the engine and the flow of cooling water are stabilized for 1 minute and the temperature difference of the water outlet temperature of the engine is less than or equal to +/-0.5 ℃, starting to record data, and recording system parameters of the engine, the temperature and pressure of each measuring point, the flow of a flowmeter, the temperature of fuel oil, the speed of the vehicle and the gradient in real time.
7. The chassis dynamometer and environmental bin-based thermal management test method according to claim 1, wherein in S14, when the whole vehicle thermal management test is carried out under a steady-state working condition, a constant-speed oil consumption test and a maximum climbing gradient test are selected, and when the whole vehicle thermal management test is carried out under a transient working condition, CHTC and C-WTVVC circulation working conditions are selected.
8. The chassis dynamometer and environmental bin-based thermal management test method according to claim 7, wherein the transient operating condition in S14 is selected from CHTC and C-WTVVC cycle operating conditions, and engine parameter data, water temperature, cooling water flow, temperature and pressure parameters of each measuring point of a sensor, oil consumption and oil temperature are recorded in real time in the test process, and test data of the transient test cycle operating condition are recorded, and three groups of hundred kilometers with oil consumption not more than 1% are recorded as effective data.
9. A chassis dynamometer and environmental bin based thermal management test system is characterized in that the system adopts the chassis dynamometer and environmental bin based thermal management test method according to any one of claims Z to 8;
the system comprises: the device comprises a temperature sensor, a pressure sensor, a flowmeter, a preheater, a chassis dynamometer and a test terminal machine;
the test terminal is provided with a data acquisition module, a CAN acquisition module, a control module, a data storage module, a data analysis module and a data display module;
the data acquisition module is respectively connected with the temperature sensor, the pressure sensor and the flowmeter and used for receiving temperature information, pressure information and water flow information in the test process;
the CAN acquisition module is connected with the vehicle control unit to acquire data information of the test sample vehicle in the test process;
the chassis dynamometer is used for fixing a test sample car, the chassis dynamometer provides road sliding resistance based on F = av2+ bv + c, road sliding resistance coefficients a, b and c and the speed V of a head-on fan are set according to V = n2V2+ n1V + n0, the sample car is placed in a neutral gear state at the moment, the sample car is automatically dragged to 100km/h by the chassis dynamometer, then freely slides to the speed of 0km/h for three times, the consistency of a sliding data curve is checked after sliding is finished, and one of three groups with the smallest error and the time error required by sliding within +/-3% is selected;
the preheater is used for heating the ambient cabin temperature to 32-37 ℃;
the data storage module is used for storing test process data information and test result information;
the data analysis module is used for analyzing the data information of the test process to obtain a final test conclusion;
the data display module is used for displaying the data information of the test process and the test result information.
10. The chassis dynamometer and environmental bin based thermal management test system of claim 9,
the information collected by the data collection module comprises: the air inlet temperature and the air outlet temperature of the engine, the inlet temperature and the outlet temperature of the intercooler, the air inlet temperature after air filtration, the ambient temperature and the rear axle temperature; the pressure measuring points comprise the air inlet pressure and the air outlet pressure of the engine, the air inlet pressure and the air outlet pressure of the intercooler, the pressure of the expansion water tank, the air inlet pressure and the air outlet back pressure after air filtration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211666222.8A CN115855529A (en) | 2022-12-23 | 2022-12-23 | Heat management test method and system based on chassis dynamometer and environmental bin |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116520905A (en) * | 2023-07-03 | 2023-08-01 | 江铃汽车股份有限公司 | Environment bin temperature control method and system with rotary drum |
| CN116702096A (en) * | 2023-08-04 | 2023-09-05 | 中汽研汽车检验中心(昆明)有限公司 | Method and device for measuring and calculating road sliding resistance of vehicle plateau environment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116520905A (en) * | 2023-07-03 | 2023-08-01 | 江铃汽车股份有限公司 | Environment bin temperature control method and system with rotary drum |
| CN116520905B (en) * | 2023-07-03 | 2023-09-08 | 江铃汽车股份有限公司 | Environment bin temperature control method and system with rotary drum |
| CN116702096A (en) * | 2023-08-04 | 2023-09-05 | 中汽研汽车检验中心(昆明)有限公司 | Method and device for measuring and calculating road sliding resistance of vehicle plateau environment |
| CN116702096B (en) * | 2023-08-04 | 2023-10-03 | 中汽研汽车检验中心(昆明)有限公司 | Method and device for measuring and calculating road sliding resistance of vehicle plateau environment |
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