Ratio loading off-line test method for hybrid transmissions and related devices

Abstract

The application provides a speed ratio loading offline test method and related device for a hybrid transmission, comprising judging whether the sub-gearbox is provided according to the sub-gearbox structure information of the transmission to be tested: if the sub-gearbox is provided, the rotating speed is first adjusted to a first preset rotating speed, the sub-gearbox is controlled to reciprocating shift, the success and failure times are counted and judged according to the preset condition; if the sub-gearbox is not provided or the sub-gearbox test is qualified, the rotating speed is again adjusted to the first preset rotating speed, the target gear is engaged, if the gear engaging failure times do not exceed the threshold value, the reverse load torque is loaded to the threshold value, the rotating speed is raised to a second preset rotating speed, the real-time speed ratio is calculated and compared with the calibration value; after the deviation is qualified, the forward load torque is loaded, the rotating speed is adjusted back to the first preset rotating speed and the normal operation is confirmed; then the load is cleared, the gear is switched and the above process is repeated, so that the speed ratio loading offline test of all gears is completed; the method effectively reduces the human error, improves the production offline test efficiency, strictly controls the product delivery quality and reduces the whole vehicle zero kilometer fault risk.

Description

Technical Field

[0001] This invention belongs to the field of transmission testing technology, specifically to the method and related apparatus for speed ratio loading offline testing of hybrid transmissions. Background Technology

[0002] With increasingly severe environmental pollution and increasingly stringent regulations on vehicle emissions, new energy vehicles have become a key focus and core development direction for the automotive industry. Commercial vehicles operate under heavy loads and require long driving ranges. Pure electric technology, limited by battery energy density, charging infrastructure, and driving range, struggles to fully meet practical application needs. Hybrid technology has thus become the mainstream solution in the commercial vehicle sector, and hybrid transmissions using the P2 structure are gradually being mass-produced and applied to commercial vehicle models. To strictly control product quality and reduce the zero-kilometer failure rate after vehicle delivery, a special speed ratio loading test must be conducted on P2 structure hybrid transmissions during the transmission production line.

[0003] Currently, existing testing methods for P2 hybrid transmissions involve simple gear shifting and unidirectional load tests. While these methods can perform basic testing, they only provide a superficial assessment. They fail to quantify the reliability of the auxiliary gearbox's shifting, resulting in inaccurate gear ratio verification and making it difficult to meet the high-precision, high-reliability requirements for the final testing of P2 hybrid transmissions. Summary of the Invention

[0004] To address the problem that existing testing methods for P2 hybrid transmissions, which rely on simple gear shifting and unidirectional load tests, only provide basic transmission testing and fail to quantify the reliability of the auxiliary gearbox shifting, resulting in inaccurate transmission ratio verification, this invention provides a method and related apparatus for offline testing of hybrid transmission ratio under load.

[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a method for testing the speed ratio loading limit of a hybrid transmission, including: S1. Based on the obtained auxiliary gearbox structure information of the transmission under test, determine whether the transmission under test has an auxiliary gearbox structure. If it is determined that an auxiliary gearbox structure exists, proceed to S2. If it is determined that an auxiliary gearbox structure does not exist, proceed to S3. S2. After adjusting the speed of the transmission under test to the first preset speed, operate the auxiliary gearbox structure to reciprocate shifting, and count the number of successful shifts and the number of failed shifts. Based on the number of successful shifts, the number of failed shifts and the preset judgment conditions, determine whether the auxiliary gearbox structure of the transmission under test has been successfully tested. If the auxiliary gearbox structure of the transmission under test is successfully tested, proceed to S3. S3. After readjusting the speed of the transmission under test to the first preset speed, count the number of failed gear shifts in a single gear shift to the target gear, and compare it with the preset gear shift threshold. If the number of failed gear shifts does not exceed the gear shift threshold, proceed to S4. S4. After applying a reverse load torque to the transmission under test to the reverse load threshold, increase the speed of the transmission under test to the second preset speed, calculate the real-time speed ratio and compare it with the calibration design value to obtain the deviation value. If the deviation value does not exceed the preset deviation threshold, proceed to S5. S5. After applying a positive load torque to the transmission under test to the positive load threshold, monitor the second operating state after adjusting the speed of the transmission under test to the first preset speed. If the second operating state is a normal state, proceed to S6. S6. Zero the load torque of the transmission under test and switch to the next gear. Repeat S3 to S5 to complete the speed ratio loading offline test.

[0006] Preferably, in step S1, the auxiliary box structure information includes the front auxiliary box structure information and the rear auxiliary box structure information.

[0007] In S1, the auxiliary box structure information includes the front auxiliary box structure information and the rear auxiliary box structure information.

[0008] Before obtaining the auxiliary gearbox structure information of the transmission under test, a test bench for the P2 structure transmission is built. The output shaft of the front motor of the test bench is coaxially connected to the input shaft of the transmission under test, and the output shaft of the rear motor of the test bench is connected to the output shaft of the transmission under test. Clutches are connected between the front motor of the test bench and the transmission under test, and between the rear motor of the test bench and the transmission under test.

[0009] Preferably, in step S2, after adjusting the speed of the transmission under test to a first preset speed, the auxiliary gearbox structure is operated to reciprocate and shift gears. Based on the number of successful shifts, the number of failed shifts, and preset judgment conditions, it is determined whether the auxiliary gearbox structure of the transmission under test has been successfully tested, including: The preset judgment conditions include a total shift threshold of 16 and a shift failure threshold of 5. Control the rotational speed of the front motor of the test bench, adjust the input shaft speed of the transmission under test to the first preset speed, open the clutch, and close the clutch to compensate for the rotational speed when the input shaft speed of the transmission under test is lower than 20 r / min; The auxiliary gearbox structure's gear shifting mechanism is operated to reciprocate towards the target gear, and the number of successful gear shifts and the number of failed gear shifts are counted. The total number of gear shifts is calculated based on the number of successful gear shifts and the number of failed gear shifts. Compare the total number of gear shifts with 16, and the number of failed gear shifts with 5; If the total number of gear shifts exceeds 16 and the number of failed gear shifts is less than 5, the test is considered successful; if the number of failed gear shifts exceeds 5, the test is considered a failure.

[0010] Preferably, in step S3, after readjusting the speed of the transmission under test to a first preset speed, the number of failed gear shifts in a single gear shift to the target gear is counted and compared with a preset gear shift threshold, including: Control the speed of the front motor of the test bench again, adjust the input shaft speed of the transmission under test to the first preset speed, and disengage the clutch; The gear shifting actuator of the transmission under test is operated to switch to the target gear in a single operation. The number of times the target gear is not reached in a single gear shift is counted to obtain the number of gear shift failures. The preset gear shift threshold is 5. The number of failed gear shifts is compared with 5. If the number of failed gear shifts does not exceed 5, the gear shift is considered successful. If the number of failed gear shifts is greater than 5, the test is considered a failure.

[0011] Preferably, in step S4, the second preset rotational speed is 1500 r / min.

[0012] Preferably, in step S4, after increasing the speed of the transmission under test to a second preset speed, the system monitors whether the transmission under test has disengaged or makes any abnormal noise. If disengagement or abnormal noise occurs, the test is deemed to have failed.

[0013] Preferably, in step S5, monitoring the second operating state after adjusting the speed of the transmission under test to a first preset speed, if the second operating state is a normal state, includes: The speed of the transmission under test is adjusted from 1500 r / min to 80 r / min. During the adjustment process, the transmission under test is monitored for whether it disengages from gear or makes abnormal noise. If it disengages from gear or makes abnormal noise, the test is deemed to have failed.

[0014] This invention proposes a speed ratio loading offline test system for hybrid transmissions, used to implement the aforementioned speed ratio loading offline test method for hybrid transmissions, including: The first processing unit is configured to determine whether the transmission under test has an auxiliary gearbox structure based on the acquired auxiliary gearbox structure information of the transmission under test. If the auxiliary gearbox structure is determined to exist, the second processing unit is started to process it. If the auxiliary gearbox structure is determined not to exist, the third processing unit is started to process it. The second processing unit is configured to adjust the speed of the transmission under test to a first preset speed, operate the auxiliary gearbox structure to reciprocate shifting, and count the number of successful shifts and the number of failed shifts. Based on the number of successful shifts, the number of failed shifts, and preset judgment conditions, it determines whether the auxiliary gearbox structure of the transmission under test has been successfully tested. If the auxiliary gearbox structure of the transmission under test is determined to have been successfully tested, the third processing unit is activated. The third processing unit is configured to readjust the speed of the transmission under test to the first preset speed, count the number of gear shift failures in a single gear shift to the target gear, and compare it with a preset gear shift threshold. If the number of gear shift failures does not exceed the gear shift threshold, the fourth processing unit is activated. The fourth processing unit is configured to apply a reverse load torque to the transmission under test to a reverse load threshold, increase the speed of the transmission under test to a second preset speed, calculate the real-time speed ratio and compare it with the calibrated design value. If the deviation value does not exceed the preset deviation threshold, the fifth processing unit is activated for processing. The fifth processing unit is configured to load a positive load torque onto the transmission under test to a positive load threshold, monitor the second operating state after adjusting the speed of the transmission under test to a first preset speed, and if the second operating state is a normal state, then start the sixth processing unit for processing. The sixth processing unit is configured to zero the load torque of the transmission under test, switch to the next gear, start the third to fifth processing units to repeat the test, and complete the test of all gears of the transmission under test, thus completing the speed ratio loading offline test.

[0015] The present invention proposes a computer device, including a memory, a processor, and a computer program stored in the memory and executable in the processor, wherein the processor executes the computer program to implement the steps of the above-described hybrid transmission speed ratio loading offline test method.

[0016] The present invention proposes a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of the above-described hybrid transmission speed ratio loading offline test method.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: This invention proposes a method for speed ratio loading offline testing of hybrid transmissions. This method first assesses the auxiliary gearbox structure and performs a dedicated reciprocating shift test, enabling quantitative evaluation of the auxiliary gearbox's reliability and preventing subsequent test failures due to auxiliary gearbox malfunctions. Then, by setting a threshold for the number of failed gear shifts, it effectively identifies gear shift mechanism faults, improving test accuracy. Subsequently, bidirectional load loading and speed adjustments simulate real-world operating conditions, comprehensively verifying the transmission's load-bearing capacity and operational stability. Real-time calculation of the speed ratio and comparison with calibration values ​​ensures transmission accuracy is up to standard, improving testing precision. This method employs a cyclic testing approach covering all gears, guaranteeing test completeness, effectively ensuring factory quality, and reducing the risk of zero-kilometer failures in the vehicle.

[0018] Furthermore, this method achieves quantitative judgment of the auxiliary gearbox shift reliability by setting a total shift threshold of 16 and a shift failure threshold of 5, and realizes quantitative evaluation of the auxiliary gearbox performance. Then, through closed-loop control of the input shaft speed, the clutch is immediately closed to compensate for the speed drop below 20 r / min, so as to stably maintain the required speed conditions for testing and avoid shift failure due to speed drop, thus ensuring the continuous and smooth test process. The auxiliary gearbox reciprocating shift test is used to comprehensively verify the durability and action accuracy of the auxiliary gearbox actuator, and to identify assembly defects in advance. Finally, the combination of total shift count and failure count further improves the rigor of the auxiliary gearbox test, effectively improving the overall test reliability and product factory pass rate.

[0019] Furthermore, this method first controls the front motor of the chassis to adjust the input shaft speed to the first preset speed and disengages the clutch, replicating the shifting environment under actual working conditions. This ensures that the test conditions are highly consistent with the actual vehicle conditions, improving the authenticity of the test. Then, a single gear shift test is used to accurately identify faults in the gear engagement mechanism of a single gear, making problem location more efficient. The preset threshold for the number of failed shifts is 5, enabling quantitative judgment and effectively avoiding missed or false judgments. Finally, the boundary between qualified and failed is strictly distinguished to quickly screen out unqualified products such as gear engagement mechanism jamming or displacement, further ensuring the quality of the transmission after production, improving the objectivity and reliability of the test results, and achieving standardized and accurate detection of target gear shifting. Attached Figure Description

[0020] Figure 1 This is a flowchart illustrating the speed ratio loading offline test method for the hybrid transmission proposed in this invention. Figure 2 A schematic diagram of a computer device provided in an embodiment of the present invention; Figure 3 This is a block diagram of a chip provided according to an embodiment of the present invention. Detailed Implementation

[0021] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0022] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] With increasingly severe environmental pollution and continuously tightening regulations on vehicle emissions, new energy vehicles have become the core development direction of the automotive industry. Commercial vehicles have high operating loads and long driving range requirements. Pure electric technology is limited by the energy density of power batteries, charging infrastructure, and driving range, making it difficult to fully adapt to actual application needs. As a result, hybrid technology has become the mainstream technology solution in the commercial vehicle field, and hybrid transmissions with P2 structure are gradually being applied to commercial vehicle models in large quantities. To strictly control product quality and reduce the zero-kilometer failure rate after vehicle delivery, a special speed ratio loading test must be conducted on P2 hybrid transmissions during the transmission production line off-line stage. However, existing testing methods generally have many shortcomings: for transmissions equipped with front and rear auxiliary gearboxes, it is impossible to quantitatively determine the reliability of auxiliary gearbox engagement; there is a lack of statistics on the number of successful and unsuccessful engagements and a closed-loop speed maintenance mechanism; the gear engagement process does not have a reasonable retry mechanism and failure threshold, which easily leads to misjudgment and missed judgment; the load loading only uses unidirectional torque and does not cover bidirectional load conditions, so it is impossible to fully verify the transmission's load-bearing capacity and anti-disengagement performance; the speed ratio verification only performs a rough numerical comparison and lacks real-time acquisition of input and output shaft speeds and deviation threshold judgment logic; the entire test does not monitor operational anomalies such as disengagement and abnormal noises, and the gear coverage is incomplete and the testing process lacks standardization, making it difficult to meet the high-precision and high-reliability off-line testing requirements of P2 hybrid transmissions. To address the aforementioned shortcomings of existing technologies, this invention aims to overcome existing testing defects and solve technical problems such as the inability to quantify the reliability of auxiliary gearbox engagement, vague gear position determination standards, limited load condition coverage, insufficient speed ratio verification accuracy, lack of monitoring for operational anomalies, and incomplete test gear coverage. By standardizing the testing process and adding closed-loop control and threshold determination mechanisms, this invention achieves precise quantitative detection of front and rear auxiliary gearbox engagement, orderly cyclic testing of all gear positions, bidirectional adaptive loading of load torque, high-precision speed ratio verification, and full-process monitoring of operating status. This effectively improves the accuracy and comprehensiveness of hybrid transmission off-line testing, strictly controls the quality of products leaving the factory, and reduces the risk of zero-kilometer failures in the entire vehicle.

[0024] To address the above problems, this invention proposes a method for testing the speed ratio loading of a hybrid transmission, specifically including the following steps: S1. Construct a test bench for the P2 structure transmission. The test bench includes a clutch, a front-end motor and a rear-end motor, and a motor controller. Connect the test bench to the transmission under test, that is, connect the output shaft of the front-end motor to the input shaft of the transmission under test coaxially, and connect the output shaft of the rear-end motor to the output shaft of the transmission under test. Connect the clutch between the front-end motor and the transmission under test, and between the rear-end motor and the transmission under test. Connect the motor controller to the transmission under test, the front-end motor, and the rear-end motor, respectively. Connect a cooling water system to the transmission under test. Obtain the auxiliary gearbox structure information of the transmission under test, that is, obtain the front auxiliary gearbox structure information and the rear auxiliary gearbox structure information of the transmission under test. Based on the obtained front auxiliary gearbox structure information and rear auxiliary gearbox structure information of the transmission under test, determine whether the transmission under test has an auxiliary gearbox structure. If it is determined that the transmission under test has an auxiliary gearbox structure, proceed to S2; if it is determined that the transmission under test does not have an auxiliary gearbox structure, proceed to S3. S2. After adjusting the speed of the transmission under test to the first preset speed (in this embodiment, the first preset speed is 80 r / min), the motor controller starts the front motor of the test bench, which drives the transmission under test to start and makes the speed of the transmission under test reach 80 r / min. The clutch is disengaged, allowing the transmission to run independently. The shifting actuator of the auxiliary gearbox structure is operated to reciprocate towards the target gear. When the speed of the input shaft of the transmission under test is lower than 20 r / min, the clutch is closed to maintain the speed for gear engagement. The number of successful shifts and the number of failed shifts are counted. The number of successful shifts and the number of failed shifts are added together to calculate the total number of shifts.

[0025] The preset judgment conditions include a total shift threshold of 16 and a shift failure threshold of 5. Compare the total number of gear shifts with 16, and the number of failed gear shifts with 5; If the total number of gear shifts exceeds 16 and the number of failed gear shifts is less than 5, the current gear of the transmission under test is considered a successful test and proceeds to S3; if the number of failed gear shifts exceeds 5, the current gear of the transmission under test is considered a failed test. S3. After readjusting the speed of the transmission under test to the first preset speed, the motor at the front end of the test bench is started via the motor controller. The motor at the front end of the test bench drives the transmission under test to start, and the speed of the transmission under test reaches 80 r / min. The clutch is disengaged, and the gear shifting actuator of the transmission under test is operated to switch to the target gear in one go. The number of gear shifting failures in a single gear shift to the target gear is counted, and the number of gear shifting failures is obtained. Initially, gear 1 is selected. In the second cycle test, gear 2 is selected, and all gear shifts are completed in sequence. The preset gear shifting threshold is 5. The number of gear shifting failures is compared with 5. If the number of gear shifting failures does not exceed 5, the gear shift is judged to be successful, and S4 is performed. If the number of gear shifting failures is greater than 5, the test is judged to be a failure.

[0026] S4. The rear motor of the test bench is started by controlling the motor controller. After the reverse load torque of the transmission under test is applied to the transmission under test to the calibration threshold, the specific value of the calibration threshold needs to be determined in combination with the test box type and the current gear. That is, after the motor controller obtains the torque value applied by the rear motor of the test bench in real time to the calibration threshold, the speed of the transmission under test is increased to the second preset speed. In this embodiment, the second preset speed is 1500 r / min. That is, the front motor of the test bench is started by controlling the motor controller, and the front motor of the test bench drives the transmission under test to start, so that the speed of the transmission under test reaches 1500 r / min. The motor controller obtains the speed of the front motor of the test bench in real time and observes the speed of the transmission under test. The test involves observing the transmission under test in its first operating state at the current torque and speed. This includes checking for gear slippage or abnormal noise. If the first operating state is abnormal (gear slippage or abnormal noise), the test is considered a failure. If the first operating state is normal (no gear slippage or abnormal noise), the test is considered successful. The input and output shaft speeds of the transmission are collected, and the current gear ratio is calculated. This ratio is compared to the calibrated design value to obtain a deviation value. This deviation value is then compared to a preset deviation threshold. If the deviation value does not exceed the preset threshold, proceed to step S5. If the deviation value exceeds the preset threshold, the test is considered a failure.

[0027] S5. Start the rear motor of the test bench by controlling the motor controller, apply positive load torque to the transmission under test to the positive load threshold, monitor and adjust the speed of the transmission under test to the second operating state after adjusting to the first preset speed. If the second operating state is normal, that is, drive the transmission under test to the front motor of the test bench to adjust the speed of the transmission under test from 1500 r / min to 80 r / min. During the adjustment, observe the second operating state of the transmission under test under the current torque and speed, that is, observe whether the transmission under test disengages or has abnormal noise under the current torque and speed. If the second operating state is abnormal, that is, disengages or has abnormal noise, the test is judged to be failed. If the second operating state is normal, that is, no disengagement or abnormal noise occurs, proceed to S6. S6. Drive the transmission under test through the front motor of the test bench to reduce the speed of the transmission under test to the target value, then clear the load torque of the transmission under test to zero, and switch to the next gear. Repeat S3 to S5 to complete the test of all gears of the transmission under test and complete the speed ratio loading offline test. If the initial gear switching position is 1, then the next gear test switches to 2.

[0028] This method achieves quantitative verification of the auxiliary gearbox's shifting performance by first determining whether the transmission has a front and rear auxiliary gearbox structure and then performing targeted tests on the auxiliary gearbox's shifting function, thus improving the targeting and reliability of transmission testing with auxiliary gearbox structures. By controlling the input shaft speed and maintaining stable test conditions in conjunction with clutch engagement and disengagement, the method ensures continuous and reliable shifting, avoiding test failure due to insufficient speed. By sequentially executing target gear shifting, bidirectional load loading, speed adjustment, and real-time speed ratio verification, the method comprehensively covers the actual operating conditions of the transmission, accurately reflecting the gear transmission accuracy and load-bearing capacity. By monitoring abnormal states such as gear disengagement and abnormal noises in real time, the method can identify assembly and processing defects in advance, improving the effectiveness of testing. This invention adopts a full-gear cyclic testing method, covering all working gears. The testing process is complete and standardized, and the speed ratio calculation and calibration value comparison method is objective and accurate, significantly improving the accuracy and reliability of off-line testing. This method can effectively reduce human error, improve the efficiency of off-line testing, strictly control product quality before leaving the factory, and reduce the risk of zero-kilometer failures in the whole vehicle.

[0029] The method is further explained and illustrated below through specific embodiments; In this embodiment, a 12-speed hybrid commercial vehicle transmission was selected for testing; Determine the mechanical structure of the 12-speed hybrid commercial vehicle transmission. Since the 12-speed hybrid commercial vehicle transmission has both a front auxiliary gearbox and a rear auxiliary gearbox structure, proceed to step S2. S1. Connect the output shaft of the front motor of the test bench to the input shaft of the 12-speed hybrid commercial vehicle gearbox coaxially, and connect the output shaft of the rear motor of the test bench to the output shaft of the 12-speed hybrid commercial vehicle gearbox; connect clutches between the front motor of the test bench and the 12-speed hybrid commercial vehicle gearbox, and between the rear motor of the test bench and the 12-speed hybrid commercial vehicle gearbox; connect the motor controller to the 12-speed hybrid commercial vehicle gearbox, the front motor of the test bench, and the rear motor of the test bench respectively; and connect a cold water intake system to the 12-speed hybrid commercial vehicle gearbox. Obtain the auxiliary gearbox structure information of the 12-speed hybrid commercial vehicle transmission. The 12-speed hybrid commercial vehicle transmission has both front and rear auxiliary gearbox structures, so proceed to step S2. S2. Adjust the speed of the transmission under test to 80 r / min, disengage the clutch to allow the transmission to run independently, and continuously attempt to engage gears at the target positions on both sides by the gear shifting actuators of the front and rear auxiliary gearboxes. By comparing the displacement with the self-learned displacement, record the number of successful or unsuccessful gear shifts. When the input shaft speed of the transmission under test is lower than 20 r / min, close the clutch to maintain the speed for gear engagement. Count the number of successful and unsuccessful gear shifts, and sum the successful and unsuccessful gear shifts to calculate the total number of gear shifts. Compare the total number of gear shifts with 16 and the number of unsuccessful gear shifts with 5. If the total number of gear shifts exceeds 16 and the number of unsuccessful gear shifts is less than 5, the current gear of the transmission under test is considered a successful test, and proceed to S3. If the number of unsuccessful gear shifts exceeds 5, the current gear of the transmission under test is considered a failed test. S3. After readjusting the speed of the transmission under test to 80 r / min, disengage the clutch and operate the gear shifting actuator of the transmission under test to shift to 1st gear in one go. Count the number of failed gear shifts in a single shift to 1st gear. The preset gear shift threshold is 5. Compare the number of failed gear shifts with 5. If the number of failed gear shifts does not exceed 5, the shift is considered successful, and proceed to S4. If the number of failed gear shifts is greater than 5, the test is considered a failure.

[0030] S4. The motor controller starts the rear motor of the test bench, applying a reverse load torque of 500 Nm to the transmission under test. Then, the motor controller starts the front motor of the test bench, bringing the transmission under test's speed to 1500 r / min. The motor controller acquires the speed of the front motor in real time and observes the first operating state of the transmission under test under the current torque and speed. Specifically, it observes whether the transmission under test disengages or makes abnormal noises under the current torque and speed. If the first operating state is abnormal (disengagement or abnormal noises), the test is considered a failure. If the first operating state is normal (no disengagement or abnormal noises), the input and output shaft speeds of the transmission are collected. The current gear ratio is calculated from the input and output shaft speeds. The current gear ratio is compared with the calibrated design value to obtain the deviation value. This deviation is compared with a preset deviation threshold. If the deviation value does not exceed the preset deviation threshold, proceed to S5. If the deviation value exceeds the preset deviation threshold, the test is considered a failure.

[0031] S5. After controlling the rear motor of the test bench to change the torque from -500 Nm to 500 Nm, monitor and adjust the speed of the transmission under test to the second operating state after the first preset speed. If the second operating state is normal, that is, drive the transmission under test through the front motor of the test bench to adjust the speed of the transmission under test from 1500 r / min to 80 r / min. During the adjustment process, observe the second operating state of the transmission under test under the current torque and speed, that is, observe whether the transmission under test disengages or has abnormal noise under the current torque and speed. If the second operating state is abnormal, that is, disengagement or abnormal noise occurs, the test is judged to be failed. If the second operating state is normal, that is, no disengagement or abnormal noise occurs, proceed to S6. S6. Drive the transmission under test through the front motor of the test bench, control the rear motor of the test bench to reduce the torque from 500 Nm to 0, switch to the next gear, repeat S3~S5, and perform cyclic testing on the 12-speed hybrid transmission in the order of 1, 3, 5, 7, 9, 11, 12, 10, 8, 6, 4, 2, 0, -1, -2 to complete the speed ratio loading offline test.

[0032] This invention proposes a speed ratio loading offline test system for hybrid power transmissions, used to implement the aforementioned speed ratio loading offline test method for hybrid power transmissions, comprising a first processing unit, a second processing unit, a third processing unit, a fourth processing unit, a fifth processing unit, and a sixth processing unit: The first processing unit is configured to determine whether the transmission under test has an auxiliary gearbox structure based on the acquired auxiliary gearbox structure information of the transmission under test. If the auxiliary gearbox structure is determined to exist, the second processing unit is started to process it. If the auxiliary gearbox structure is determined not to exist, the third processing unit is started to process it. The second processing unit is configured to adjust the speed of the transmission under test to a first preset speed, operate the auxiliary gearbox structure to reciprocate shifting, and count the number of successful shifts and the number of failed shifts. Based on the number of successful shifts, the number of failed shifts, and preset judgment conditions, it determines whether the auxiliary gearbox structure of the transmission under test has been successfully tested. If the auxiliary gearbox structure of the transmission under test is determined to have been successfully tested, the third processing unit is activated. The third processing unit is configured to readjust the speed of the transmission under test to the first preset speed, count the number of gear shift failures in a single gear shift to the target gear, and compare it with a preset gear shift threshold. If the number of gear shift failures does not exceed the gear shift threshold, the fourth processing unit is activated. The fourth processing unit is configured to apply a reverse load torque to the transmission under test to a reverse load threshold, increase the speed of the transmission under test to a second preset speed, calculate the real-time speed ratio and compare it with the calibrated design value. If the deviation value does not exceed the preset deviation threshold, the fifth processing unit is activated for processing. The fifth processing unit is configured to load a positive load torque onto the transmission under test to a positive load threshold, monitor the second operating state after adjusting the speed of the transmission under test to a first preset speed, and if the second operating state is a normal state, then start the sixth processing unit for processing. The sixth processing unit is configured to zero the load torque of the transmission under test, switch to the next gear, start the third to fifth processing units to repeat the test, complete the test of all gears of the transmission under test, and complete the speed ratio loading offline test.

[0033] In another embodiment of the present invention, a computer device is provided, comprising a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the memory. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, suitable for implementing at least one instruction, specifically suitable for loading and executing one or more instructions to implement a corresponding method flow or corresponding function. The processor in this embodiment of the present invention can be used to implement the operation of a hybrid transmission speed ratio loading offline test method, including: S1. Based on the acquired auxiliary gearbox structure information of the transmission under test, determine whether the transmission under test has an auxiliary gearbox structure. If the auxiliary gearbox structure exists, proceed to S2; otherwise, proceed to S3. S2. After adjusting the speed of the transmission under test to a first preset speed, operate the auxiliary gearbox structure to reciprocate gear shifting, and count the number of successful gear shifts and the number of failed gear shifts. Based on the number of successful gear shifts, the number of failed gear shifts, and preset judgment conditions, determine whether the auxiliary gearbox structure of the transmission under test has been successfully tested. If the auxiliary gearbox structure of the transmission under test has been successfully tested, proceed to S3. S3. After adjusting the speed of the transmission under test to the first preset speed again, count the number of failed gear shifts in a single shift to the target gear. The number of failed gear shifts is counted and compared with a preset gear shift threshold. If the number of failed gear shifts does not exceed the gear shift threshold, proceed to S4; S4: After applying a reverse load torque to the transmission under test to the reverse load threshold, increase the speed of the transmission under test to the second preset speed, calculate the real-time speed ratio and compare it with the calibrated design value. If the deviation value does not exceed the preset deviation threshold, proceed to S5; S5: After applying a forward load torque to the transmission under test to the forward load threshold, monitor and adjust the speed of the transmission under test to the first preset speed to the second operating state. If the second operating state is normal, proceed to S6; S6: Reset the load torque of the transmission under test to zero and switch to the next gear. Repeat S3 to S5 to complete the speed ratio loading offline test.

[0034] In another embodiment of the present invention, a storage medium is also provided, specifically a computer-readable storage medium (Memory). The computer-readable storage medium is a memory device in a terminal device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the terminal device and extended storage media supported by the terminal device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, the storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be high-speed RAM or non-volatile memory, such as at least one disk storage device.

[0035] One or more instructions stored in a computer-readable storage medium can be loaded and executed by a processor to implement the corresponding steps of the speed ratio loading offline test method for the hybrid transmission in the above embodiments; one or more instructions in the computer-readable storage medium are loaded and executed by the processor in the following steps: S1. Based on the acquired auxiliary gearbox structure information of the transmission under test, determine whether the transmission under test has an auxiliary gearbox structure. If the auxiliary gearbox structure exists, proceed to S2; otherwise, proceed to S3. S2. After adjusting the speed of the transmission under test to a first preset speed, operate the auxiliary gearbox structure to reciprocate gear shifting, and count the number of successful gear shifts and the number of failed gear shifts. Based on the number of successful gear shifts, the number of failed gear shifts, and preset judgment conditions, determine whether the auxiliary gearbox structure of the transmission under test has been successfully tested. If the auxiliary gearbox structure of the transmission under test has been successfully tested, proceed to S3. S3. After adjusting the speed of the transmission under test to the first preset speed again, count the number of failed gear shifts in a single shift to the target gear. The number of failed gear shifts is counted and compared with a preset gear shift threshold. If the number of failed gear shifts does not exceed the gear shift threshold, proceed to S4; S4: After applying a reverse load torque to the transmission under test to the reverse load threshold, increase the speed of the transmission under test to the second preset speed, calculate the real-time speed ratio and compare it with the calibrated design value. If the deviation value does not exceed the preset deviation threshold, proceed to S5; S5: After applying a forward load torque to the transmission under test to the forward load threshold, monitor and adjust the speed of the transmission under test to the first preset speed to the second operating state. If the second operating state is normal, proceed to S6; S6: Reset the load torque of the transmission under test to zero and switch to the next gear. Repeat S3 to S5 to complete the speed ratio loading offline test.

[0036] Please see Figure 2The terminal device is a computer device. In this embodiment, the computer device 60 includes a processor 61, a memory 62, and a computer program 63 stored in the memory 62 and executable on the processor 61. When executed by the processor 61, the computer program 63 implements the fluid composition calculation method in the reservoir stimulation wellbore of this embodiment. To avoid repetition, details are omitted here. Alternatively, when executed by the processor 61, the computer program 63 implements the functions of each model / unit in the speed ratio loading offline test system of the hybrid transmission of this embodiment. To avoid repetition, details are omitted here.

[0037] Computer device 60 can be a desktop computer, laptop, handheld computer, cloud server, or other computing device. Computer device 60 may include, but is not limited to, a processor 61 and a memory 62. Those skilled in the art will understand that... Figure 2 This is merely an example of computer device 60 and does not constitute a limitation on computer device 60. It may include more or fewer components than shown, or combine certain components, or different components. For example, computer device may also include input / output devices, network access devices, buses, etc.

[0038] The processor 61 may be a central processing unit (CPU), or other general-purpose processors, CPUs, graphics processing units (GPUs), digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, quantum computing-based data processing logic units, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0039] The memory 62 can be an internal storage unit of the computer device 60, such as a hard disk or memory of the computer device 60. The memory 62 can also be an external storage device of the computer device 60, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on the computer device 60.

[0040] Furthermore, the memory 62 may include both internal storage units of the computer device 60 and external storage devices. The memory 62 is used to store computer programs and other programs and data required by the computer device. The memory 62 can also be used to temporarily store data that has been output or will be output.

[0041] Any references to memory, databases, or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0042] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0043] Please see Figure 3 The terminal device is a chip. In this embodiment, the chip 600 includes a processor 622, which may be one or more, and a memory 632 for storing computer programs executable by the processor 622. The computer program stored in the memory 632 may include one or more modules, each corresponding to a set of instructions. Furthermore, the processor 622 may be configured to execute the computer program to perform the aforementioned hybrid transmission speed ratio loading offline test method.

[0044] Additionally, chip 600 may also include a power supply component 626 and a communication component 650. The power supply component 626 can be configured to perform power management of chip 600, and the communication component 650 can be configured to enable communication of chip 600, such as wired or wireless communication. Furthermore, chip 600 may also include an input / output interface 658. Chip 600 can operate on an operating system stored in memory 632.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A method for testing the speed ratio loading of a hybrid transmission, characterized in that, include: S1. Based on the obtained auxiliary gearbox structure information of the transmission under test, determine whether the transmission under test has an auxiliary gearbox structure. If it is determined that an auxiliary gearbox structure exists, proceed to S2. If it is determined that an auxiliary gearbox structure does not exist, proceed to S3. S2. After adjusting the speed of the transmission under test to the first preset speed, operate the auxiliary gearbox structure to reciprocate shifting, and count the number of successful shifts and the number of failed shifts. Based on the number of successful shifts, the number of failed shifts and the preset judgment conditions, determine whether the auxiliary gearbox structure of the transmission under test has been successfully tested. If the auxiliary gearbox structure of the transmission under test is successfully tested, proceed to S3. S3. After readjusting the speed of the transmission under test to the first preset speed, count the number of failed gear shifts in a single gear shift to the target gear, and compare it with the preset gear shift threshold. If the number of failed gear shifts does not exceed the gear shift threshold, proceed to S4. S4. After applying a reverse load torque to the transmission under test to the reverse load threshold, increase the speed of the transmission under test to the second preset speed, calculate the real-time speed ratio and compare it with the calibration design value to obtain the deviation value. If the deviation value does not exceed the preset deviation threshold, proceed to S5. S5. After applying a positive load torque to the transmission under test to the positive load threshold, monitor the second operating state after adjusting the speed of the transmission under test to the first preset speed. If the second operating state is a normal state, proceed to S6. S6. Zero the load torque of the transmission under test and switch to the next gear. Repeat S3 to S5 to complete the speed ratio loading offline test.

2. The method for speed ratio loading offline test of a hybrid transmission according to claim 1, characterized in that, In S1, the auxiliary box structure information includes the front auxiliary box structure information and the rear auxiliary box structure information; Before obtaining the auxiliary gearbox structure information of the transmission under test, a test bench for the P2 structure transmission is built. The output shaft of the front motor of the test bench is coaxially connected to the input shaft of the transmission under test, and the output shaft of the rear motor of the test bench is connected to the output shaft of the transmission under test. Clutches are connected between the front motor of the test bench and the transmission under test, and between the rear motor of the test bench and the transmission under test.

3. The method for speed ratio loading offline test of a hybrid transmission according to claim 2, characterized in that, In step S2, after adjusting the speed of the transmission under test to a first preset speed, the auxiliary gearbox structure is operated to reciprocate and shift gears. Based on the number of successful shifts, the number of failed shifts, and preset judgment conditions, it is determined whether the auxiliary gearbox structure of the transmission under test has been successfully tested, including: The preset judgment conditions include a total shift threshold of 16 and a shift failure threshold of 5. Control the rotational speed of the front motor of the test bench, adjust the input shaft speed of the transmission under test to the first preset speed, open the clutch, and close the clutch to compensate for the rotational speed when the input shaft speed of the transmission under test is lower than 20 r / min; The auxiliary gearbox structure's gear shifting mechanism is operated to reciprocate towards the target gear, and the number of successful gear shifts and the number of failed gear shifts are counted. The total number of gear shifts is calculated based on the number of successful gear shifts and the number of failed gear shifts. Compare the total number of gear shifts with 16, and the number of failed gear shifts with 5; If the total number of gear shifts exceeds 16 and the number of failed gear shifts is less than 5, the test is considered successful; if the number of failed gear shifts exceeds 5, the test is considered a failure.

4. The method for speed ratio loading offline test of a hybrid transmission according to claim 2, characterized in that, In step S3, after readjusting the speed of the transmission under test to the first preset speed, the number of failed gear shifts in a single gear shift to the target gear is counted and compared with a preset gear shift threshold, including: Control the speed of the front motor of the test bench again, adjust the input shaft speed of the transmission under test to the first preset speed, and disengage the clutch; The gear shifting actuator of the transmission under test is operated to switch to the target gear in a single operation. The number of times the target gear is not reached in a single gear shift is counted to obtain the number of gear shift failures. The preset gear shift threshold is 5. The number of failed gear shifts is compared with 5. If the number of failed gear shifts does not exceed 5, the gear shift is considered successful. If the number of failed gear shifts is greater than 5, the test is considered a failure.

5. The method for speed ratio loading offline test of a hybrid transmission according to claim 1, characterized in that, In step S4, the second preset rotational speed is 1500 r / min.

6. The method for speed ratio loading offline test of a hybrid transmission according to claim 1, characterized in that, In step S4, after increasing the speed of the transmission under test to the second preset speed, the system monitors whether the transmission under test has disengaged from gear or has any abnormal noise. If disengagement or abnormal noise occurs, the test is deemed to have failed.

7. The method for speed ratio loading offline test of a hybrid transmission according to claim 5, characterized in that, In step S5, monitoring the second operating state after adjusting the speed of the transmission under test to a first preset speed, if the second operating state is a normal state, includes: The speed of the transmission under test is adjusted from 1500 r / min to 80 r / min. During the adjustment process, the transmission under test is monitored for whether it disengages from gear or makes abnormal noise. If it disengages from gear or makes abnormal noise, the test is deemed to have failed.

8. A speed ratio loading offline test system for a hybrid transmission, used to implement the speed ratio loading offline test method for a hybrid transmission as described in any one of claims 1 to 7, characterized in that, include: The first processing unit is configured to determine whether the transmission under test has an auxiliary gearbox structure based on the acquired auxiliary gearbox structure information of the transmission under test. If the auxiliary gearbox structure is determined to exist, the second processing unit is started to process it. If the auxiliary gearbox structure is determined not to exist, the third processing unit is started to process it. The second processing unit is configured to adjust the speed of the transmission under test to a first preset speed, operate the auxiliary gearbox structure to reciprocate shifting, and count the number of successful shifts and the number of failed shifts. Based on the number of successful shifts, the number of failed shifts, and preset judgment conditions, it determines whether the auxiliary gearbox structure of the transmission under test has been successfully tested. If the auxiliary gearbox structure of the transmission under test is determined to have been successfully tested, the third processing unit is activated. The third processing unit is configured to readjust the speed of the transmission under test to the first preset speed, count the number of gear shift failures in a single gear shift to the target gear, and compare it with a preset gear shift threshold. If the number of gear shift failures does not exceed the gear shift threshold, the fourth processing unit is activated. The fourth processing unit is configured to apply a reverse load torque to the transmission under test to a reverse load threshold, increase the speed of the transmission under test to a second preset speed, calculate the real-time speed ratio and compare it with the calibration design value to obtain a deviation value. If the deviation value does not exceed a preset deviation threshold, the fifth processing unit is activated for processing. The fifth processing unit is configured to load a positive load torque onto the transmission under test to a positive load threshold, monitor the second operating state after adjusting the speed of the transmission under test to a first preset speed, and if the second operating state is a normal state, then start the sixth processing unit for processing. The sixth processing unit is configured to zero the load torque of the transmission under test, switch to the next gear, start the third to fifth processing units to repeat the test, complete the test of all gears of the transmission under test, and complete the speed ratio loading offline test.

9. A computer device, characterized in that, The device includes a memory, a processor, and a computer program stored in the memory and executable in the processor. When the processor executes the computer program, it implements the steps of the speed ratio loading offline test method for the hybrid transmission according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the speed ratio loading offline test method for the hybrid transmission according to any one of claims 1 to 7.

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