AMT gearbox low-speed road condition testing and evaluating method

Abstract

The invention discloses an AMT gearbox low-speed road condition test and evaluation method, and relates to the technical field of gearbox test and evaluation, and the method comprises the following steps: S1, taking a test and evaluation method for a commercial vehicle AMT gearbox in a special low-speed road condition as an example, building an inspection index matrix for the commercial vehicle AMT gearbox, and confirming that the AMT gearbox meets the function requirements under the low-speed road condition; the invention provides an AMT gearbox low-speed road condition test and evaluation method, which can effectively make up the deficiency of special low-speed road condition subjective evaluation content in an original commercial vehicle AMT gearbox subjective evaluation method, increases the subjective evaluation of special road conditions, enriches the tests of commercial vehicles carrying AMT gearboxes in different use scenes, and improves the test efficiency. The calibration and debugging period of the AMT gearbox can be shortened, and the method is suitable for subjective evaluation and testing of the commodity of various types of commercial vehicles carrying the AMT gearbox.

Description

Technical Field

[0001] The present invention relates to the technical field of gearbox testing and evaluation, and in particular to a method for testing and evaluating an AMT gearbox under low-speed road conditions. Background Art

[0002] AMT transmission has inherent advantages in the field of commercial vehicles due to its low manufacturing cost, high reliability, simple operation and high transmission efficiency. The calibration, smoothness, shifting strategy and powertrain matching of automatic transmission are factors to be considered in the design stage. How to determine whether these factors can meet market and user expectations must be controlled through a set of standard evaluation methods to ultimately achieve the commercial purpose of commercial vehicles;

[0003] For special low-speed road conditions, such as internal roads in factory areas, docks, building material markets and construction sites, the roads are narrow, parking spaces are close, vehicles are close to platforms and unpaved roads. Vehicles need to drive stably at low speeds and start and stop frequently. Therefore, the AMT transmission needs to be able to accurately and delicately control the vehicle power even on unpaved roads. Therefore, it is necessary to simulate users entering special low-speed road conditions to carry out AMT transmission evaluation.

[0004] Currently, there is no subjective evaluation method for AMT transmissions under the above-mentioned special low-speed road conditions. Therefore, a low-speed road condition test and evaluation method for AMT transmissions is proposed to solve the above-mentioned problem. Summary of the invention

[0005] The object of the present invention is to provide a method for testing and evaluating an AMT transmission at low speed on a road condition, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for testing and evaluating low-speed road conditions of an AMT transmission, comprising the following steps:

[0007] S1: Taking the test and evaluation method of commercial vehicle AMT gearbox under special low-speed road conditions as an example, an inspection index matrix for commercial vehicle AMT gearbox is established to confirm that the AMT gearbox meets the functional requirements under low-speed road conditions;

[0008] S2: Establish a low-speed road condition evaluation database to facilitate the call for each low-speed road condition. The called database content can be made into an evaluation matrix use case for data recording;

[0009] S3: The tester uses the AMT gearbox-specific evaluation standard to convert the tester's oral evaluation of the evaluation matrix test content into quantitative data results and record them in the evaluation matrix use case, thereby obtaining a preliminary evaluation result;

[0010] S4: Based on the preliminary evaluation results, update the low-speed road condition evaluation database, create a regression test evaluation matrix, conduct a secondary subjective evaluation of commercial vehicles equipped with AMT gearboxes, and output the evaluation results.

[0011] Preferably, step S1 also includes establishing an inspection index matrix for the AMT gearbox of a commercial vehicle by taking the test and evaluation method for the AMT gearbox of a commercial vehicle under special low-speed road conditions as an example, and the selected inspection indexes are divided into two levels, the first level includes the starting stage, the driving stage and the parking stage, the second level is the sub-items of the first level, wherein the sub-items included in the starting stage include start interlock, starting protection, auxiliary hill start, automatic starting gear selection and A / M mode switching, wherein the sub-items included in the driving stage include gear function switching, idling, deceleration and downshifting, creep mode, emergency braking and low-speed extension function, wherein the sub-items included in the parking stage include flameout protection and parking status feedback.

[0012] Preferably, the step S1 also includes constructing an inspection indicator matrix, wherein the inspection indicator levels are distributed in the vertical columns of the inspection indicator matrix, and the descriptions, verification benchmarks and results of the inspection indicators are distributed in the horizontal columns of the inspection indicator matrix. Due to different load states of the vehicle and whether the vehicle is in a driving state, the corresponding response feedback of the AMT gearbox is different. Therefore, it is necessary to inspect and verify the AMT gearbox mounted on the commercial vehicle in four states: no-load, full-load, static and dynamic. A commercial vehicle AMT gearbox function inspection table is constructed based on the inspection and verification results, as shown in the following table:

[0013] Table 1 Commercial vehicle AMT transmission function checklist

[0014]

[0015] Confirm that the AMT transmission meets the functional requirements under low-speed road conditions.

[0016] Preferably, step S2 also includes establishing a low-speed road condition evaluation database to facilitate calling for various low-speed road conditions, and the low-speed road condition evaluation database stores road data, AMT transmission static data and AMT transmission dynamic data, and the road data is specifically special low-speed road condition data, which includes but is not limited to internal factory roads, docks, various material trading markets and construction sites, and the AMT transmission static data is specifically evaluated when the vehicle is not driving, mainly evaluating the transmission shift quality, and the shift quality is divided into two parts, including instrument shift display evaluation and transmission shift operation evaluation, wherein the instrument shift display evaluation includes the responsiveness recognition and understanding evaluation of the instrument display shift information and the consistency evaluation of the logo of the shift information change, wherein the transmission shift operation evaluation includes the evaluation of the feel, strength, sound, travel and ease of operation of the operation, and the speed shift operation methods include hand shift, gear lever, knob and button.

[0017] Preferably, step S2 also includes AMT transmission dynamic data, which is specifically evaluated when the vehicle is driving, and the evaluation indicators include but are not limited to: transmission shifting quality, transmission matching, fuel economy, low-speed drivability and error operation protection during driving, and collecting driving operations involved in various special low-speed road conditions, including moving the vehicle, reversing, turning, starting, creeping, following and slipping conditions, and the low-speed road condition evaluation database is continuously optimized and updated according to the actual test process.

[0018] Preferably, the step S2 further comprises constructing a commercial vehicle AMT subjective evaluation item table based on the evaluation items of the low-speed road condition evaluation database, and the items, sub-items, key points, scores, advantages, disadvantages and remarks in the evaluation items are arranged in horizontal columns in the commercial vehicle AMT subjective evaluation item table, as shown in the following table:

[0019] Table 2 Subjective evaluation items of commercial vehicle AMT

[0020]

[0021]

[0022] Preferably, step S3 further comprises formulating a special evaluation standard for an AMT gearbox, and the special evaluation standard for an AMT gearbox is composed of three scoring angles, namely, a user angle, a test evaluation angle, and a designer angle, wherein the user angle is composed of three levels: whether there is a function, whether the experience is good or bad, and the degree of improvement perceived; wherein the test evaluation angle is composed of three levels: harmful to users, acceptable to users, and good user evaluation; wherein the designer angle is composed of three levels: need for redesign, can be improved but not needed for the time being, and no need for improvement; and an AMT gearbox special evaluation standard table is constructed, as shown in the following table:

[0023] Table 3 AMT gearbox-specific evaluation criteria

[0024]

[0025] Preferably, step S3 also includes the tester using the AMT gearbox-specific evaluation standard to conduct a subjective evaluation of the AMT gearbox for a specific low-speed road condition scenario, screening out data of the specific low-speed road condition scenario from a low-speed road condition evaluation database, and drawing a test matrix use case for the low-speed road condition. For example, for a mining quarrying area with strong magnetic field interference, the test matrix use cases such as moving the vehicle, reversing the parking space, and starting the vehicle are screened out from the low-speed road condition evaluation database, and the evaluation sub-items for the dynamic response of the AMT gearbox to the operating instructions are listed from the operating points, and the test matrix use cases are converted into quantitative data results and recorded in the evaluation matrix use cases, thereby obtaining preliminary evaluation results.

[0026] Preferably, step S4 also includes updating the low-speed road condition evaluation database based on the preliminary evaluation results, creating a regression test evaluation matrix use case, conducting a secondary subjective evaluation of commercial vehicles equipped with AMT gearboxes, and outputting the secondary subjective evaluation results. When new situations arise, for example, technicians update the control strategy based on the evaluation results, it is necessary to repeat the preliminary preparations and test evaluations until the final test objectives are met.

[0027] Compared with the prior art, the beneficial effects of the present invention include at least: the present invention proposes an AMT gearbox low-speed road condition test and evaluation method, which can effectively make up for the lack of subjective evaluation content for special low-speed road conditions in the original commercial vehicle AMT gearbox subjective evaluation method, add the subjective evaluation of special road conditions, and enrich the test of commercial vehicles equipped with AMT gearboxes in different usage scenarios, which helps to shorten the AMT gearbox calibration and debugging cycle, and is suitable for commercial subjective evaluation tests of various types of commercial vehicles equipped with AMT gearboxes. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A flowchart of a method for testing and evaluating low-speed road conditions of an AMT transmission provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1 The present invention provides a technical solution: a method for testing and evaluating low-speed road conditions of an AMT transmission, comprising the following steps:

[0031] S1: Taking the test and evaluation method of commercial vehicle AMT gearbox under special low-speed road conditions as an example, an inspection index matrix for commercial vehicle AMT gearbox is established to confirm that the AMT gearbox meets the functional requirements under low-speed road conditions;

[0032] S2: Establish a low-speed road condition evaluation database to facilitate the call for each low-speed road condition. The called database content can be made into an evaluation matrix use case for data recording;

[0033] S3: The tester uses the AMT gearbox-specific evaluation standard to convert the tester's oral evaluation of the evaluation matrix test content into quantitative data results and record them in the evaluation matrix use case, thereby obtaining a preliminary evaluation result;

[0034] S4: Based on the preliminary evaluation results, update the low-speed road condition evaluation database, create a regression test evaluation matrix, conduct a secondary subjective evaluation of commercial vehicles equipped with AMT gearboxes, and output the evaluation results.

[0035] Step S1 also includes taking the test and evaluation method of the AMT gearbox of a commercial vehicle under special low-speed road conditions as an example, establishing an inspection index matrix for the AMT gearbox of a commercial vehicle, and the selected inspection indexes are divided into two levels, the first level includes the starting stage, the driving stage and the parking stage, the second level is the sub-items of the first level, wherein the sub-items included in the starting stage include start interlock, starting protection, auxiliary hill start, automatic starting gear selection and A / M mode switching, wherein the sub-items included in the driving stage include gear function switching, idling, deceleration downshift, creep mode, emergency braking and low-speed extension function, wherein the sub-items included in the parking stage include flameout protection and parking status feedback;

[0036] Step S1 also includes the inspection indicator matrix constructed, in which the inspection indicator level is distributed in the vertical columns of the inspection indicator matrix, and the description of the inspection indicator, the verification benchmark and the result are distributed in the horizontal columns of the inspection indicator matrix. Due to the different load states of the vehicle and whether the vehicle is in a driving state, the corresponding response feedback of the AMT gearbox is different. Therefore, it is necessary to inspect and verify the AMT gearbox installed in the commercial vehicle in four states: no load, full load, static and dynamic. A commercial vehicle AMT gearbox function inspection table is constructed based on the inspection and verification results, as shown in the following table:

[0037] Table 1 Commercial vehicle AMT transmission function checklist

[0038]

[0039] Confirm that the AMT transmission meets the functional requirements under low-speed road conditions;

[0040] Step S2 also includes establishing a low-speed road condition evaluation database to facilitate calling for various low-speed road conditions, and the low-speed road condition evaluation database stores road data, AMT transmission static data and AMT transmission dynamic data, and the road data is specifically special low-speed road condition data, the road condition includes but is not limited to internal roads in the factory area, docks, various material trading markets and construction sites, and the AMT transmission static data is specifically evaluated when the vehicle is not driving, mainly evaluating the transmission shift quality, and the shift quality is divided into two parts, including instrument shift display evaluation and transmission shift operation evaluation, wherein the instrument shift display evaluation includes the recognition of the response degree of the instrument display shift information, the understanding evaluation and the consistency evaluation of the logo of the shift information change, wherein the transmission shift operation evaluation includes the evaluation of the feel, strength, sound, travel and convenience of operation, and the speed change operation mode includes hand shift, gear lever, knob and button;

[0041] Step S2 also includes AMT transmission dynamic data, specifically evaluation during vehicle driving, evaluation indicators include but are not limited to: transmission shift quality, transmission matching, fuel economy, low-speed drivability and error operation protection during driving, collection of driving operations involved in various special low-speed road conditions, including vehicle moving conditions, reverse parking conditions, U-turn conditions, starting conditions, creeping conditions, following vehicle conditions and slipping conditions, and the low-speed road condition evaluation database is continuously optimized and updated according to the actual test process;

[0042] Step S2 also includes constructing a commercial vehicle AMT subjective evaluation project table based on the evaluation items of the low-speed road condition evaluation database, and the items, sub-items, key points, scores, advantages, disadvantages and remarks in the evaluation items are arranged in horizontal columns in the commercial vehicle AMT subjective evaluation project table, as shown in the following table:

[0043] Table 2 Subjective evaluation items of commercial vehicle AMT

[0044]

[0045]

[0046] Step S3 also includes formulating a special evaluation standard for an AMT gearbox, and the special evaluation standard for an AMT gearbox is composed of three scoring angles, namely, the user angle, the test evaluation angle, and the designer angle, wherein the user angle is composed of three levels: whether there is a function, whether the experience is good or bad, and the degree of improvement. The test evaluation angle is composed of three levels: harmful to users, acceptable to users, and good user evaluation. The designer angle is composed of three levels: need for redesign, can be improved but not needed for the time being, and no need for improvement. A special evaluation standard table for an AMT gearbox is constructed, as shown in the following table:

[0047] Table 3 AMT gearbox-specific evaluation criteria

[0048]

[0049] Step S3 also includes the tester using the AMT gearbox-specific evaluation standard to subjectively evaluate the AMT gearbox for a specific low-speed road condition scenario, screening out data of the specific low-speed road condition scenario from a low-speed road condition evaluation database, and drawing a test matrix case for the low-speed road condition. For example, for a mining quarrying area with strong magnetic field interference, the test matrix case is screened out from the low-speed road condition evaluation database to draw a test matrix case, list the evaluation items of the dynamic response degree of the AMT gearbox to the operation command from the operation points, and convert the test matrix case into a quantitative data result and record it in the evaluation matrix case, so as to obtain a preliminary evaluation result;

[0050] Step S4 also includes updating the low-speed road condition evaluation database based on the preliminary evaluation results, creating a regression test evaluation matrix use case, conducting a secondary subjective evaluation of commercial vehicles equipped with AMT gearboxes, and outputting the secondary subjective evaluation results. When new situations arise, for example, technicians update the control strategy based on the evaluation results, it is necessary to repeat the preliminary preparations and test evaluations until the final test objectives are met.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for testing and evaluating low-speed road conditions of an AMT transmission, characterized in that The following steps are involved: S1: Taking the test and evaluation method of commercial vehicle AMT gearbox under special low-speed road conditions as an example, an inspection index matrix for commercial vehicle AMT gearbox is established to confirm that the AMT gearbox meets the functional requirements under low-speed road conditions; S2: Establish a low-speed road condition evaluation database to facilitate the call for each low-speed road condition. The called database content can be made into an evaluation matrix use case for data recording; S3: The tester uses the AMT gearbox-specific evaluation standard to convert the tester's oral evaluation of the evaluation matrix test content into quantitative data results and record them in the evaluation matrix use case, thereby obtaining a preliminary evaluation result; S4: Based on the preliminary evaluation results, update the low-speed road condition evaluation database, create a regression test evaluation matrix, conduct a secondary subjective evaluation of commercial vehicles equipped with AMT gearboxes, and output the evaluation results.

2. The method for testing and evaluating low-speed road conditions of an AMT transmission according to claim 1, characterized in that: The step S1 also includes establishing an inspection index matrix for the AMT gearbox of a commercial vehicle by taking the test and evaluation method for the AMT gearbox of a commercial vehicle under special low-speed road conditions as an example, and the selected inspection indexes are divided into two levels, the first level includes the starting stage, the driving stage and the parking stage, the second level is the sub-items of the first level, wherein the sub-items included in the starting stage include start interlock, starting protection, auxiliary hill start, automatic starting gear selection and A / M mode switching, wherein the sub-items included in the driving stage include gear function switching, idling, deceleration and downshifting, creep mode, emergency braking and low-speed extension function, wherein the sub-items included in the parking stage include flameout protection and parking status feedback.

3. The method for testing and evaluating low-speed road conditions of an AMT transmission according to claim 1, characterized in that: The step S1 also includes constructing an inspection indicator matrix, in which the inspection indicator levels are distributed in the vertical columns of the inspection indicator matrix, and the descriptions, verification benchmarks and results of the inspection indicators are distributed in the horizontal columns of the inspection indicator matrix. Due to different load states of the vehicle and whether the vehicle is in a driving state, the corresponding response feedback of the AMT gearbox is different. Therefore, it is necessary to inspect and verify the AMT gearbox installed in commercial vehicles in four states: no-load, full-load, static and dynamic. Based on the inspection and verification results, a commercial vehicle AMT gearbox function inspection table is constructed to confirm that the AMT gearbox meets the functional requirements under low-speed road conditions.

4. The method for testing and evaluating low-speed road conditions of an AMT transmission according to claim 1, characterized in that: The step S2 also includes establishing a low-speed road condition evaluation database to facilitate calling for various low-speed road conditions, and the low-speed road condition evaluation database stores road data, AMT transmission static data and AMT transmission dynamic data, and the road data is specifically special low-speed road condition data, which includes but is not limited to internal roads in the factory, docks, various material trading markets and construction sites, and the AMT transmission static data is specifically evaluated when the vehicle is not driving, mainly evaluating the transmission shift quality, and the shift quality is divided into two parts, including instrument shift display evaluation and transmission shift operation evaluation, wherein the instrument shift display evaluation includes the responsiveness recognition and understanding evaluation of the instrument display shift information and the consistency evaluation of the logo of the shift information change, wherein the transmission shift operation evaluation includes the evaluation of the feel, strength, sound, travel and ease of operation of the operation, and the shift operation methods include hand shift, gear lever, knob and button.

5. The method for testing and evaluating low-speed road conditions of an AMT transmission according to claim 1, characterized in that: The step S2 also includes the AMT transmission dynamic data, which is specifically evaluated when the vehicle is driving. The evaluation indicators include but are not limited to: transmission shifting quality, transmission matching, fuel economy, low-speed drivability and error operation protection during driving, and collecting driving operations involved in various special low-speed road conditions, including moving the vehicle, reversing, turning, starting, creeping, following and slipping conditions. The low-speed road condition evaluation database is continuously optimized and updated according to the actual test process.

6. The AMT transmission low-speed road condition test and evaluation method according to claim 1, characterized in that: The step S2 also includes constructing a commercial vehicle AMT subjective evaluation project table based on the evaluation items of the low-speed road condition evaluation database, and the items, sub-items, key points, scores, advantages, disadvantages and notes in the evaluation items are distributed in horizontal columns in the commercial vehicle AMT subjective evaluation project table.

7. The AMT transmission low-speed road condition test and evaluation method according to claim 1, characterized in that: The step S3 also includes formulating a special evaluation standard for the AMT gearbox, and the special evaluation standard for the AMT gearbox is composed of three scoring angles, namely, the user angle, the test evaluation angle and the designer angle, wherein the user angle is composed of three levels: whether there is a function, how good the experience is, and the degree of improvement perceived; wherein the test evaluation angle is composed of three levels: harmful to users, acceptable to users, and good user evaluation; wherein the designer angle is composed of three levels: need for redesign, can be improved but not needed for the time being, and no need for improvement, and a special evaluation standard table for the AMT gearbox is constructed.

8. The method for testing and evaluating low-speed road conditions of an AMT transmission according to claim 1, characterized in that: The step S3 also includes the tester using the AMT gearbox-specific evaluation standard to conduct a subjective evaluation of the AMT gearbox for a specific low-speed road condition scenario, screening out data of the specific low-speed road condition scenario from a low-speed road condition evaluation database, drawing a test matrix case for the low-speed road condition, and converting the test matrix case into quantitative data results and recording them in an evaluation matrix case, thereby obtaining a preliminary evaluation result.

9. The method for testing and evaluating low-speed road conditions of an AMT transmission according to claim 1, characterized in that: The step S4 also includes updating the low-speed road condition evaluation database based on the preliminary evaluation results, creating a regression test evaluation matrix use case, conducting a secondary subjective evaluation of commercial vehicles equipped with AMT gearboxes, and outputting the secondary subjective evaluation results. When new situations arise, the preliminary preparations and test evaluations need to be repeated until the final test objectives are met.

Images