RDE simulation test method, device, equipment and readable storage medium

Abstract

The present application relates to an RDE simulation test method, apparatus, equipment and readable storage medium, comprising dividing actual driving data corresponding to a vehicle model to be tested into multiple speed intervals and a number of short-stroke segments according to a preset speed interval threshold; determining whether the actual driving data is valid based on the average vehicle speed, relative positive acceleration and 95th percentile value of the product of speed and acceleration in each speed interval; when the actual driving data of all speed intervals are valid, determining the intense driving conditions corresponding to each speed interval; determining the weight value of each speed interval and the number of short-stroke segments used for RDE simulation testing based on the intense driving conditions to be tested corresponding to the vehicle model to be tested; constructing an RDE simulation condition based on the actual driving data and weight value of the short-stroke segments used for the RDE simulation test, and the powertrain bench control system performs an RDE simulation test of the vehicle model to be tested based on the RDE simulation condition, thereby reducing the test error rate and development cost and improving the test efficiency.

Description

Technical Field

[0001] The present application relates to the field of vehicle driving emission technology, and in particular to an RDE simulation test method, device, equipment and readable storage medium. Background Art

[0002] Currently, some diesel vehicles are equipped with specialized exhaust emissions testing software that identifies when the vehicle is being tested. This software is then secretly activated during inspection, allowing the vehicle to pass inspection with "high environmental standards." However, during normal driving, these vehicles emit large amounts of pollutants, up to 40 times the legal limit. In response to this, the Phase VI light vehicle emission testing regulations have added a new on-road RDE (Real Driving Emission) test, which simultaneously monitors vehicle emissions in a fixed laboratory and on the road.

[0003] Specifically, according to Appendix D of GB18352.6-2016, "Light-Duty Vehicle Pollutant Emission Limits and Measurement Methods - China Phase VI," the tester established detailed requirements for actual road RDE pollutant testing. For example, based on project requirements, the vehicle was equipped with a PEMS (Portable Emission Measure System) and an ECU (Electronic Control Unit) data acquisition device, and the test vehicle was immersed in the test environment for more than 12 hours. After the immersion, the PEMS equipment was warmed up before the test to ensure effective operation. Then, according to regulatory requirements, the vehicle was tested for approximately two hours in suburban areas, urban areas, and on highways to ensure data normality and integrity throughout the test process. Finally, the data was post-processed using the windowing method to obtain the test results required by the regulations. Finally, the vehicle calibration was optimized based on the test results to ensure that the vehicle's actual road emissions results met the national standard limits.

[0004] From the test process recorded above, it can be found that: when the test vehicle is driving on the actual road and testing pollutant emissions, it is easily affected by weather, traffic conditions, driving style, etc., so that the consistency of pollutants emitted by the test vehicle during the RDE test on actual road driving and the user vehicle during actual road driving cannot be effectively controlled, which increases the error rate of the test and indirectly increases the test and labor costs. In addition, since a single RDE test takes about 2 hours, it further increases the time cost. Summary of the Invention

[0005] The present application provides an RDE simulation test method, apparatus, device and readable storage medium to solve the problems of poor RDE test accuracy and high cost in the related art.

[0006] In a first aspect, a RDE simulation test method is provided, comprising the following steps:

[0007] Obtain the actual driving data corresponding to the vehicle model to be tested;

[0008] Dividing the actual driving data into a plurality of speed intervals according to a preset speed interval threshold, and dividing each speed interval into a plurality of short travel segments;

[0009] The validity of the actual driving data of the corresponding speed interval is determined based on the average vehicle speed, relative positive acceleration, and the 95th percentile value of the product of speed and acceleration in each speed interval;

[0010] When the actual driving data for all speed intervals is valid, the aggressive driving conditions corresponding to each speed interval are determined based on the distribution of the 95th percentile value of the product of speed and acceleration, where the aggressive driving conditions include normal driving, aggressive driving, and ultra-aggressive driving;

[0011] Obtaining the intense driving conditions to be tested corresponding to the vehicle model to be tested, and determining the weight values ​​for each speed interval and the number of short trip segments in each speed interval for the RDE simulation test based on the intense driving conditions to be tested and the intense driving conditions in each speed interval;

[0012] The RDE simulation cycle is constructed based on the actual driving data of the short trip segments used for the RDE simulation test in each speed range and the weight values ​​of each speed range;

[0013] The RDE simulated working conditions are input into the powertrain bench control system so that the powertrain bench control system can perform RDE simulation tests on the vehicle model to be tested based on the RDE simulated working conditions.

[0014] In some embodiments, determining whether the actual driving data for each speed interval is valid based on the average vehicle speed, relative positive acceleration, and 95th percentile of the product of speed and acceleration in each speed interval includes:

[0015] When the average vehicle speed in the first speed interval is greater than the first speed threshold, determining whether the relative positive acceleration in the first speed interval is less than the first relative positive acceleration threshold; if not, the actual driving data in the first speed interval is valid;

[0016] When the average vehicle speed in the first speed interval is greater than the second speed threshold and less than or equal to the first speed threshold, determining whether the relative positive acceleration in the first speed interval is less than the second relative positive acceleration threshold; if not, determining whether the 95th percentile value of the product of speed and acceleration in the first speed interval is greater than the first percentile threshold; if not, the actual driving data in the first speed interval is valid;

[0017] When the average vehicle speed in the first speed interval is less than or equal to the second speed threshold, it is determined whether the 95th percentile value of the product of speed and acceleration in the first speed interval is greater than the second percentile threshold. If not, the actual driving data in the first speed interval is valid.

[0018] In some embodiments, before the step of performing the RDE simulation test of the vehicle model to be tested based on the RDE simulation working condition, the powertrain test bench control system further includes:

[0019] Determining whether the RDE simulated operating condition is a valid operating condition based on a ratio between a first area of ​​an engine operating region of a powertrain test bench control system and a second area of ​​an engine operating region of a vehicle under test operating on an actual road;

[0020] When the ratio of the first area to the second area is greater than the area threshold, the RDE simulation working condition is a valid working condition, and the powertrain bench control system performs an RDE simulation test on the vehicle model to be tested based on the RDE simulation working condition.

[0021] In some embodiments, after the step of the powertrain test bench control system performing the RDE simulation test of the vehicle model to be tested based on the RDE simulation working condition, the method further includes:

[0022] Based on the RDE simulation test results, the control optimization of the test vehicle model is carried out to ensure that the test vehicle model meets the actual driving pollutant emission limit requirements.

[0023] In some embodiments, the speed interval includes a low speed interval, a medium speed interval and a high speed interval, the low speed interval is [0, 60), the medium speed interval is [60, 90), and the high speed interval is [90, the national standard speed upper limit).

[0024] In a second aspect, an RDE simulation test device is provided, comprising:

[0025] An acquisition unit, which is used to acquire actual driving data corresponding to the vehicle type to be tested and acquire the intense driving conditions to be tested corresponding to the vehicle type to be tested;

[0026] a dividing unit, configured to divide the actual driving data into a plurality of speed intervals according to a preset speed interval threshold, and to divide each speed interval into a plurality of short travel segments;

[0027] a determination unit, configured to determine whether the actual driving data for each speed interval is valid based on the average vehicle speed, the relative positive acceleration, and the 95th percentile of the product of speed and acceleration in each speed interval;

[0028] a determination unit configured to, when actual driving data for all speed intervals are valid, determine, based on a distribution of 95th percentile values ​​of the product of speed and acceleration, an aggressive driving condition corresponding to each speed interval, wherein the aggressive driving condition includes normal driving, aggressive driving, and ultra-aggressive driving; and determine, based on the aggressive driving condition to be tested, a weight value for each speed interval and a number of short trip segments in each speed interval for an RDE simulation test;

[0029] A construction unit, configured to construct an RDE simulation condition based on actual driving data of a short trip segment for an RDE simulation test in each speed interval and a weight value of each speed interval;

[0030] The test unit is used to input the RDE simulation working conditions into the powertrain bench control system so that the powertrain bench control system can perform RDE simulation testing on the vehicle model to be tested based on the RDE simulation working conditions.

[0031] In some embodiments, the determining unit is specifically configured to:

[0032] When the average vehicle speed in the first speed interval is greater than the first speed threshold, determining whether the relative positive acceleration in the first speed interval is less than the first relative positive acceleration threshold; if not, the actual driving data in the first speed interval is valid;

[0033] When the average vehicle speed in the first speed interval is greater than the second speed threshold and less than or equal to the first speed threshold, determining whether the relative positive acceleration in the first speed interval is less than the second relative positive acceleration threshold; if not, determining whether the 95th percentile value of the product of speed and acceleration in the first speed interval is greater than the first percentile threshold; if not, the actual driving data in the first speed interval is valid;

[0034] When the average vehicle speed in the first speed interval is less than or equal to the second speed threshold, it is determined whether the 95th percentile value of the product of speed and acceleration in the first speed interval is greater than the second percentile threshold. If not, the actual driving data in the first speed interval is valid.

[0035] In some embodiments, the testing unit is further configured to:

[0036] Determining whether the RDE simulated operating condition is a valid operating condition based on a ratio between a first area of ​​an engine operating region of a powertrain test bench control system and a second area of ​​an engine operating region of a vehicle under test operating on an actual road;

[0037] When the ratio of the first area to the second area is greater than the area threshold, the RDE simulation working condition is a valid working condition, and the powertrain bench control system performs an RDE simulation test on the vehicle model to be tested based on the RDE simulation working condition.

[0038] In a third aspect, an RDE simulation test device is provided, comprising: a memory and a processor, wherein the memory stores at least one instruction, and the at least one instruction is loaded and executed by the processor to implement the aforementioned RDE simulation test method.

[0039] In a fourth aspect, a computer-readable storage medium is provided, wherein the computer storage medium stores a computer program, and when the computer program is executed by a processor, the aforementioned RDE simulation test method is implemented.

[0040] The beneficial effects brought about by the technical solution provided by this application include: effectively reducing the error rate of testing, improving testing efficiency and reducing test development costs.

[0041] The present application provides an RDE simulation test method, device, equipment and readable storage medium, including obtaining actual driving data corresponding to the vehicle model to be tested; dividing the actual driving data into multiple speed intervals according to a preset speed interval threshold, and dividing each speed interval into several short-trip segments; judging whether the actual driving data of the corresponding speed interval is valid based on the average vehicle speed, relative positive acceleration and 95th percentile value of the product of speed and acceleration in each speed interval; when the actual driving data of all speed intervals are valid, determining the intense driving conditions corresponding to each speed interval based on the distribution of the 95th percentile value of the product of speed and acceleration, and the intense driving conditions Driving conditions include normal driving, intense driving and super intense driving; obtaining the intense driving conditions to be tested corresponding to the vehicle model to be tested, determining the weight value of each speed interval and the number of short-stroke segments in each speed interval for RDE simulation testing based on the intense driving conditions to be tested and the intense driving conditions in each speed interval; constructing RDE simulation conditions based on the actual driving data of the short-stroke segments for RDE simulation testing in each speed interval and the weight value of each speed interval; inputting the RDE simulation conditions into the powertrain bench control system so that the powertrain bench control system can perform RDE simulation testing of the vehicle model to be tested based on the RDE simulation conditions. Through this application, an effective RDE simulation condition for the vehicle model to be tested can be determined, so that the powertrain bench system can perform RDE simulation testing based on the RDE simulation condition, that is, transferring the actual road pollutant test test to the powertrain bench system, not only does it not need to be tested on the actual road for about 2 hours, but it can also perform calibration optimization work in a fixed test environment to ensure the consistency and validity of the data, thereby effectively reducing the error rate of the test, improving the test efficiency and reducing the test development cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0043] Figure 1 A schematic diagram of a flow chart of an RDE simulation test method provided in an embodiment of the present application;

[0044] Figure 2 Schematic diagram of V*a_

[95] distribution provided in the embodiment of the present application;

[0045] Figure 3 A schematic diagram of actual road driving conditions in the prior art;

[0046] Figure 4 Schematic diagram of RDE simulation working conditions provided in the embodiment of the present application;

[0047] Figure 5 A schematic diagram showing the engine operating area coverage under the actual road RDE operating condition and the RDE simulation operating condition provided in the embodiment of the present application;

[0048] Figure 6 A schematic structural diagram of an RDE simulation test device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0050] The embodiments of the present application provide an RDE simulation test method, apparatus, device, and readable storage medium, which can solve the problems of poor RDE test accuracy and high cost in related technologies.

[0051] Figure 1 An RDE simulation test method provided in an embodiment of the present application includes the following steps:

[0052] Step S10: Acquire actual driving data corresponding to the vehicle type to be tested;

[0053] For example, in this embodiment, in order to ensure that the developed vehicle model can effectively utilize the alternative operating conditions, the actual driving data of the developed vehicle in different cities and regions is first used as the data source for the alternative operating conditions; the actual driving data includes: vehicle speed, second-by-second results of pollutant emissions, engine speed, engine torque, acceleration and deceleration during actual driving, and the number of additions and subtractions.

[0054] Step S20: dividing the actual driving data into a plurality of speed intervals according to a preset speed interval threshold, and dividing each speed interval into a plurality of short travel segments;

[0055] Furthermore, the speed interval includes a low-speed interval, a medium-speed interval and a high-speed interval, the low-speed interval is [0, 60), the medium-speed interval is [60, 90), and the high-speed interval is [90, the national standard speed upper limit).

[0056] For example, in this embodiment, actual driving data from different regions is segmented and divided into short trips according to preset speed range thresholds (e.g., [0, 60), [60, 90), and [90, the national speed limit), etc.), and defined as low-speed range, medium-speed range, and high-speed range, each of which includes multiple short trips. The speed ranges are defined as follows: 0 km / h ≤ low-speed range < 60 km / h, 60 km / h ≤ medium-speed range < 90 km / h, and 90 km / h ≤ high-speed range < the national maximum speed requirement.

[0057] Step S30: determining whether the actual driving data for each speed interval is valid based on the average vehicle speed, relative positive acceleration, and 95th percentile of the product of speed and acceleration in each speed interval;

[0058] Furthermore, determining whether the actual driving data for each speed interval is valid based on the average vehicle speed, relative positive acceleration, and 95th percentile of the product of speed and acceleration in each speed interval includes:

[0059] When the average vehicle speed in the first speed interval is greater than the first speed threshold, determining whether the relative positive acceleration in the first speed interval is less than the first relative positive acceleration threshold; if not, the actual driving data in the first speed interval is valid;

[0060] When the average vehicle speed in the first speed interval is greater than the second speed threshold and less than or equal to the first speed threshold, determining whether the relative positive acceleration in the first speed interval is less than the second relative positive acceleration threshold; if not, determining whether the 95th percentile value of the product of speed and acceleration in the first speed interval is greater than the first percentile threshold; if not, the actual driving data in the first speed interval is valid;

[0061] When the average vehicle speed in the first speed interval is less than or equal to the second speed threshold, it is determined whether the 95th percentile value of the product of speed and acceleration in the first speed interval is greater than the second percentile threshold. If not, the actual driving data in the first speed interval is valid.

[0062] For example, in this embodiment, the RPA (relative positive acceleration) value and V*a_

[95] value (i.e., the 95th percentile value of the product of speed and acceleration, representing the 95th percentile of V*a in each speed group) in the low-speed range, medium-speed range, and high-speed range of the actual vehicle can be calculated based on the actual driving data corresponding to the vehicle model to be tested. The definition and calculation formula are as follows:

[0063]

[0064] Where △t=1s, V is the average speed, a is the acceleration, d is the travel distance, and i and j are the time steps.

[0065] This embodiment defines whether the actual driving data in the speed range is valid as follows:

[0066] When the average vehicle speed V in a certain speed range is ≤ 94.05 km / h (i.e., the first speed threshold), and if RPA is < (-0.0016*V+0.1755) (i.e., the second relative positive acceleration threshold), the trip in this speed range is deemed invalid.

[0067] When the average vehicle speed V in a certain speed range is greater than 94.05 km / h (i.e., the first speed threshold), and if RPA is less than 0.025 (i.e., the first relative positive acceleration threshold), the trip in this speed range is considered invalid.

[0068] When the vehicle speed V in the speed interval is ≤ 74.6 km / h (i.e., the second speed threshold), if V*a_

[95] >(0.136*V+14.44) (i.e., the second quantile threshold), the trip in this speed interval is judged to be invalid;

[0069] When the vehicle speed V in the speed interval is greater than 74.6 km / h (ie, the second speed threshold), if V*a_

[95] >(0.0742*V+18.966) (ie, the first percentile threshold), it is determined that the trip in this speed interval is invalid.

[0070] According to the above definition, the validity of the actual driving data in each speed interval can be determined based on the average vehicle speed, relative positive acceleration and the 95th percentile value of the product of speed and acceleration in each speed interval.

[0071] Step S40: When the actual driving data for all speed intervals are valid, the aggressive driving conditions corresponding to each speed interval are determined based on the distribution of the 95th percentile value of the product of speed and acceleration, where the aggressive driving conditions include normal driving, aggressive driving, and ultra-aggressive driving;

[0072] For example, in this embodiment, if the actual driving data of any speed range is invalid, the acquired actual driving data needs to be deleted, and new actual driving data needs to be acquired again, and the validity of the new actual driving data needs to be judged; if the actual driving data of all speed ranges are valid, then the intense driving conditions corresponding to each speed range are further judged based on the distribution of the 95th percentile value of the product of speed and acceleration.

[0073] After satisfying the effectiveness of driving in low-speed range, medium-speed range and high-speed range, this embodiment also defines the smoothness and intensity of vehicle driving, thereby quantifying the intensity of the driver's driving during the test: the V*a_

[95] distribution diagram (such as Figure 2 As shown), when V*a_

[95] ≤a1, it is normal driving; when a1<V*a_

[95] ≤A1, it is intense driving; when A1<V*a_

[95] <limit (the limit is the maximum value to ensure the effective travel of the entire driving process), it is super intense driving.

[0074] For example, when representing different driving intensity levels in a certain area, the calculated values ​​of V*a_

[95] are:

[0075] Normal driving: 7m in urban areas 2 / s 3 ≤V*a_

[95] <9m 2 / s 3 , suburban area is 15m 2 / s 3 ≤V*a_

[95] <19m 2 / s 3 , high speed is 16m 2 / s 3 ≤V*a_

[95] <20m 2 / s 3；

[0076] Super intense driving: 11m in urban areas 2 / s 3 ≤V*a_

[95] <14m 2 / s 3 , suburban area is 22m 2 / s 3 ≤V*a_

[95] <24m 2 / s 3 , high speed is 23m2 / s 3 ≤V*a_

[95] <25m 2 / s 3 .

[0077] Therefore, based on the predefined smoothness and intensity of vehicle driving, the intense driving conditions corresponding to each speed range can be further determined according to the distribution of the 95th percentile value of the product of speed and acceleration in each speed range.

[0078] Step S50: Obtaining the intense driving condition to be tested corresponding to the vehicle model to be tested, and determining the weight value of each speed interval and the number of short trip segments in each speed interval for the RDE simulation test based on the intense driving condition to be tested and the intense driving conditions of each speed interval;

[0079] For example, in this embodiment, the intense driving conditions corresponding to each speed range are already known in step S40, so the intense driving conditions to be tested can be selected according to project requirements, and after obtaining the intense driving conditions to be tested corresponding to the vehicle model to be tested, the intense driving conditions to be tested are compared with the intense driving conditions corresponding to each speed range, and the weight value of each speed range and the number of short-trip segments used for the RDE simulation test are determined based on the mapping relationship between the preset intense driving conditions and the weights and the number of short-trip segments.

[0080] Step S60: constructing an RDE simulation condition based on the actual driving data of the short trip segments used for the RDE simulation test in each speed interval and the weight value of each speed interval;

[0081] Exemplarily, in this embodiment, a self-developed editing program can be used to construct an RDE simulation condition based on the actual driving data of short-trip segments in each speed interval for RDE simulation testing and the weight value of each speed interval. Among them, the workflow of the self-developed editing program is as follows: the simulation condition is composed of multiple speed interval condition curves, and the vehicle speed can be freely defined according to the development project and the accuracy of the test equipment. The upper and lower limits of this speed are integer multiples; then the number of speed interval conditions is set, and the required number of speed intervals is set according to the vehicle speed distribution; then define the duration of each speed interval and the maximum speed range and number of each speed interval; extract the second-by-second speeds from the database and combine them to form the required RDE simulation condition. In addition, the actual road driving condition and the RDE simulation condition in this embodiment can be referred to respectively. Figure 3 and Figure 4 shown.

[0082] Step S70: inputting the RDE simulation working condition into the powertrain test bench control system, so that the powertrain test bench control system performs an RDE simulation test on the vehicle model to be tested based on the RDE simulation working condition.

[0083] Furthermore, before the step of performing the RDE simulation test of the vehicle model to be tested based on the RDE simulation working condition, the powertrain test bench control system further includes:

[0084] Determining whether the RDE simulated operating condition is a valid operating condition based on a ratio between a first area of ​​an engine operating region of a powertrain test bench control system and a second area of ​​an engine operating region of a vehicle under test operating on an actual road;

[0085] When the ratio of the first area to the second area is greater than the area threshold, the RDE simulation working condition is a valid working condition, and the powertrain bench control system performs an RDE simulation test on the vehicle model to be tested based on the RDE simulation working condition.

[0086] Furthermore, after the step of performing the RDE simulation test of the vehicle model to be tested based on the RDE simulation working condition, the powertrain test bench control system further includes:

[0087] Based on the RDE simulation test results, the control optimization of the test vehicle model is carried out to ensure that the test vehicle model meets the actual driving pollutant emission limit requirements.

[0088] For example, in this embodiment, after the RDE simulation conditions are constructed, they need to be transplanted to the powertrain test bench control system for programming. The powertrain test bench control system can be used to complete the actual road pollutant emission survey and calibration optimization work in the early stage of product development in a fixed test environment. The specific process is as follows:

[0089] Enter the powertrain test bench control system and create an RDE simulation work path, which can be named Project_RDE_simuliation; import the RDE simulation conditions established earlier into the powertrain test bench control system (such as Figure 4 In the Test Object module under the Project_RDE_simulation path, select the Test Object Operating Condition module to edit the vehicle speed and load required by the powertrain test bench control system. The powertrain test bench control system then converts the vehicle speed into the speed and load required by the dynamometer for subsequent engine and transmission control. After the established RDE simulation condition is imported, a coast-down check is performed on the time-speed-road resistance to ensure that the powertrain test bench control system simulates the RDE test of the vehicle on a real road. The validity of the RDE simulation condition is then evaluated by comparing the engine operating range on the actual road with the engine operating range on the powertrain test bench control system. The calculated compliance rate must be greater than 95% to determine the RDE simulation condition is valid.

[0090] For details, see Figure 5 As shown, the first area of ​​the engine operating area of ​​the powertrain test bench control system is divided by the second area of ​​the engine working area of ​​the vehicle to be tested running on the actual road, wherein the area of ​​the engine working area is determined based on the engine speed and torque; when the ratio of the first area to the second area is greater than 95%, the RDE simulation condition is a valid condition, and the powertrain test bench control system performs an RDE simulation test of the vehicle to be tested based on the RDE simulation condition, and optimizes the vehicle control according to the test results to meet the national standard limit requirements. In addition, in order to ensure the accuracy of the RDE simulation condition, the second-by-second results of pollutant emissions in the test results (such as Figure 4 The NOx in the RDE simulation is compared with the second-by-second results of pollutant emissions in the actual driving data to determine whether the RDE simulation conditions need to be optimized.

[0091] It can be seen that through the embodiment of the present application, an effective RDE simulation condition for the vehicle model to be tested can be determined, so that the powertrain bench system can perform RDE simulation testing based on the RDE simulation condition, that is, the actual road pollutant test test is transferred to the powertrain bench system. The entire test process only takes about 30 minutes, not only eliminating the need for about 2 hours of testing on the actual road, but also allowing calibration optimization work to be performed in a fixed test environment to ensure data consistency and validity, thereby effectively reducing the test error rate, improving test efficiency and reducing test development costs. At the same time, since testers can perform RDE simulation testing in the laboratory, the risk of travel is effectively reduced.

[0092] The present application also provides an RDE simulation test device, including:

[0093] An acquisition unit, which is used to acquire actual driving data corresponding to the vehicle type to be tested and acquire the intense driving conditions to be tested corresponding to the vehicle type to be tested;

[0094] a dividing unit, configured to divide the actual driving data into a plurality of speed intervals according to a preset speed interval threshold, and to divide each speed interval into a plurality of short travel segments;

[0095] a determination unit, configured to determine whether the actual driving data for each speed interval is valid based on the average vehicle speed, the relative positive acceleration, and the 95th percentile of the product of speed and acceleration in each speed interval;

[0096] a determination unit configured to, when actual driving data for all speed intervals are valid, determine, based on a distribution of 95th percentile values ​​of the product of speed and acceleration, an aggressive driving condition corresponding to each speed interval, wherein the aggressive driving condition includes normal driving, aggressive driving, and ultra-aggressive driving; and determine, based on the aggressive driving condition to be tested, a weight value for each speed interval and a number of short trip segments in each speed interval for an RDE simulation test;

[0097] A construction unit, configured to construct an RDE simulation condition based on actual driving data of a short trip segment for an RDE simulation test in each speed interval and a weight value of each speed interval;

[0098] The test unit is used to input the RDE simulation working conditions into the powertrain bench control system so that the powertrain bench control system can perform RDE simulation testing on the vehicle model to be tested based on the RDE simulation working conditions.

[0099] It can be seen that through the embodiments of the present application, the effective RDE simulation working conditions of the vehicle model to be tested can be determined, so that the powertrain bench system can perform RDE simulation testing based on the RDE simulation working conditions, that is, the actual road pollutant test experiment is transferred to the powertrain bench system. The entire test process only takes about 30 minutes. Not only does it not require about 2 hours of testing on the actual road, but calibration optimization work can also be performed in a fixed test environment to ensure the consistency and validity of the data, thereby effectively reducing the test error rate, improving test efficiency and reducing test development costs.

[0100] Furthermore, the determination unit is specifically configured to:

[0101] When the average vehicle speed in the first speed interval is greater than the first speed threshold, determining whether the relative positive acceleration in the first speed interval is less than the first relative positive acceleration threshold; if not, the actual driving data in the first speed interval is valid;

[0102] When the average vehicle speed in the first speed interval is greater than the second speed threshold and less than or equal to the first speed threshold, determining whether the relative positive acceleration in the first speed interval is less than the second relative positive acceleration threshold; if not, determining whether the 95th percentile value of the product of speed and acceleration in the first speed interval is greater than the first percentile threshold; if not, the actual driving data in the first speed interval is valid;

[0103] When the average vehicle speed in the first speed interval is less than or equal to the second speed threshold, it is determined whether the 95th percentile value of the product of speed and acceleration in the first speed interval is greater than the second percentile threshold. If not, the actual driving data in the first speed interval is valid.

[0104] Furthermore, the testing unit is also used for:

[0105] Determining whether the RDE simulated operating condition is a valid operating condition based on a ratio between a first area of ​​an engine operating region of a powertrain test bench control system and a second area of ​​an engine operating region of a vehicle under test operating on an actual road;

[0106] When the ratio of the first area to the second area is greater than the area threshold, the RDE simulation working condition is a valid working condition, and the powertrain bench control system performs an RDE simulation test on the vehicle model to be tested based on the RDE simulation working condition.

[0107] Furthermore, the testing unit is also used for:

[0108] Based on the RDE simulation test results, the control optimization of the test vehicle model is carried out to ensure that the test vehicle model meets the actual driving pollutant emission limit requirements.

[0109] Furthermore, the speed interval includes a low-speed interval, a medium-speed interval and a high-speed interval, the low-speed interval is [0, 60), the medium-speed interval is [60, 90), and the high-speed interval is [90, the national standard speed upper limit).

[0110] It should be noted that those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and units can refer to the corresponding processes in the aforementioned RDE simulation test method embodiment, and will not be repeated here.

[0111] The RDE simulation test device provided in the above embodiment can be implemented in the form of a computer program. The computer program can be used in Figure 6 The RDE simulation shown is run on the test equipment.

[0112] An embodiment of the present application also provides an RDE simulation test device, comprising: a memory, a processor, and a network interface connected via a system bus, wherein at least one instruction is stored in the memory, and at least one instruction is loaded and executed by the processor to implement all or part of the steps of the aforementioned RDE simulation test method.

[0113] Among them, the network interface is used for network communication, such as sending assigned tasks, etc. Those skilled in the art will understand that Figure 6 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different component arrangement.

[0114] The processor may be a CPU, or other general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. A general-purpose processor may be a microprocessor, or any conventional processor. The processor is the control center of a computer device, connecting various parts of the entire computer device using various interfaces and lines.

[0115] The memory can be used to store computer programs and / or modules. The processor implements various functions of the computer device by running or executing the computer programs and / or modules stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area. The program storage area can store an operating system, at least one application required for a function (such as a video playback function, an image playback function, etc.), etc.; the data storage area can store data created based on the use of the mobile phone (such as video data, image data, etc.). In addition, the memory can include high-speed random access memory and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a smart memory card (SmartMediaCard, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0116] An embodiment of the present application further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, all or part of the steps of the aforementioned RDE simulation test method are implemented.

[0117] The embodiments of the present application implement all or part of the aforementioned processes, and may also be completed by instructing related hardware through a computer program. The computer program may be stored in a computer-readable storage medium, and the computer program, when executed by a processor, may implement the steps of each of the above methods. Among them, the computer program includes computer program code, and the computer program code may be in source code form, object code form, executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0118] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, servers, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage) containing computer-usable program code.

[0119] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0120] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0121] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A RDE simulation test method, characterized in that: The following steps are involved: Obtain the actual driving data corresponding to the vehicle model to be tested; Dividing the actual driving data into a plurality of speed intervals according to a preset speed interval threshold, and dividing each speed interval into a plurality of short travel segments; The validity of the actual driving data of the corresponding speed interval is determined based on the average vehicle speed, relative positive acceleration, and the 95th percentile value of the product of speed and acceleration in each speed interval; When the actual driving data for all speed intervals is valid, the aggressive driving conditions corresponding to each speed interval are determined based on the distribution of the 95th percentile value of the product of speed and acceleration, where the aggressive driving conditions include normal driving, aggressive driving, and ultra-aggressive driving; Obtaining the intense driving conditions to be tested corresponding to the vehicle model to be tested, and determining the weight values ​​for each speed interval and the number of short trip segments in each speed interval for the RDE simulation test based on the intense driving conditions to be tested and the intense driving conditions in each speed interval; The RDE simulation cycle is constructed based on the actual driving data of the short trip segments used for the RDE simulation test in each speed range and the weight values ​​of each speed range; Inputting the RDE simulated working condition into the powertrain test bench control system, so that the powertrain test bench control system performs an RDE simulation test of the vehicle model to be tested based on the RDE simulated working condition; The determining whether the actual driving data for each speed interval is valid based on the average vehicle speed, relative positive acceleration, and 95th percentile of the product of speed and acceleration in each speed interval includes: When the average vehicle speed in the first speed interval is greater than the first speed threshold, determining whether the relative positive acceleration in the first speed interval is less than the first relative positive acceleration threshold; if not, the actual driving data in the first speed interval is valid; When the average vehicle speed in the first speed interval is greater than the second speed threshold and less than or equal to the first speed threshold, determining whether the relative positive acceleration in the first speed interval is less than the second relative positive acceleration threshold; if not, determining whether the 95th percentile value of the product of speed and acceleration in the first speed interval is greater than the first percentile threshold; if not, the actual driving data in the first speed interval is valid; When the average vehicle speed in the first speed interval is less than or equal to the second speed threshold, determining whether the 95th percentile value of the product of speed and acceleration in the first speed interval is greater than the second percentile threshold; if not, the actual driving data in the first speed interval is valid; Before the step of performing the RDE simulation test of the vehicle model to be tested based on the RDE simulation working condition by the powertrain test bench control system, the method further includes: determining whether the RDE simulated operating condition is a valid operating condition based on a ratio between a first area of ​​an engine operating region of a powertrain test bench control system and a second area of ​​an engine operating region of the vehicle under test operating on an actual road, the area of ​​the engine operating region being determined based on an engine speed and torque; When the ratio of the first area to the second area is greater than the area threshold, the RDE simulation working condition is a valid working condition, and the powertrain bench control system performs an RDE simulation test on the vehicle model to be tested based on the RDE simulation working condition.

2. The RDE simulation test method according to claim 1, wherein: After the step of performing the RDE simulation test of the vehicle model to be tested based on the RDE simulation working condition by the powertrain test bench control system, the method further includes: Based on the RDE simulation test results, the control optimization of the test vehicle model is carried out to ensure that the test vehicle model meets the actual driving pollutant emission limit requirements.

3. The RDE simulation test method according to claim 1, wherein: The speed interval includes a low speed interval, a medium speed interval and a high speed interval, wherein the low speed interval is [0, 60), the medium speed interval is [60, 90), and the high speed interval is [90, the national standard speed upper limit).

4. An RDE simulation test device, characterized in that: include: An acquisition unit, which is used to acquire actual driving data corresponding to the vehicle type to be tested and acquire the intense driving conditions to be tested corresponding to the vehicle type to be tested; a dividing unit, configured to divide the actual driving data into a plurality of speed intervals according to a preset speed interval threshold, and to divide each speed interval into a plurality of short travel segments; a determination unit, configured to determine whether the actual driving data for each speed interval is valid based on the average vehicle speed, the relative positive acceleration, and the 95th percentile of the product of speed and acceleration in each speed interval; a determination unit configured to, when actual driving data for all speed intervals are valid, determine, based on a distribution of 95th percentile values ​​of the product of speed and acceleration, an aggressive driving condition corresponding to each speed interval, wherein the aggressive driving condition includes normal driving, aggressive driving, and ultra-aggressive driving; and determine, based on the aggressive driving condition to be tested, a weight value for each speed interval and a number of short trip segments in each speed interval for an RDE simulation test; A construction unit, configured to construct an RDE simulation condition based on actual driving data of a short trip segment for an RDE simulation test in each speed interval and a weight value of each speed interval; A test unit, which is used to input the RDE simulation working condition into the powertrain test bench control system, so that the powertrain test bench control system performs an RDE simulation test of the vehicle model to be tested based on the RDE simulation working condition; The determining unit is specifically configured to: When the average vehicle speed in the first speed interval is greater than the first speed threshold, determining whether the relative positive acceleration in the first speed interval is less than the first relative positive acceleration threshold; if not, the actual driving data in the first speed interval is valid; When the average vehicle speed in the first speed interval is greater than the second speed threshold and less than or equal to the first speed threshold, determining whether the relative positive acceleration in the first speed interval is less than the second relative positive acceleration threshold; if not, determining whether the 95th percentile value of the product of speed and acceleration in the first speed interval is greater than the first percentile threshold; if not, the actual driving data in the first speed interval is valid; When the average vehicle speed in the first speed interval is less than or equal to the second speed threshold, determining whether the 95th percentile value of the product of speed and acceleration in the first speed interval is greater than the second percentile threshold; if not, the actual driving data in the first speed interval is valid; The test unit is also used to: determining whether the RDE simulated operating condition is a valid operating condition based on a ratio between a first area of ​​an engine operating region of a powertrain test bench control system and a second area of ​​an engine operating region of the vehicle under test operating on an actual road, the area of ​​the engine operating region being determined based on an engine speed and torque; When the ratio of the first area to the second area is greater than the area threshold, the RDE simulation working condition is a valid working condition, and the powertrain bench control system performs an RDE simulation test on the vehicle model to be tested based on the RDE simulation working condition.

5. An RDE simulation test device, characterized in that: include: A memory and a processor, wherein the memory stores at least one instruction, and the at least one instruction is loaded and executed by the processor to implement the RDE simulation test method according to any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the RDE simulation test method according to any one of claims 1 to 3 is implemented.

Images