A test method for the effect of the front drive assembly mounting angle on the vehicle's drivability

Abstract

A method for testing the effect of the assembly mounting angle on the drivability of a whole vehicle belongs to the technical field of vehicle performance testing. The method is: according to the assembly mounting angle range, a plurality of different sets of active ends of left and right suspensions and rear suspensions are made; the assembly mounting angle range is 15° forward to 15° backward; according to the above assembly mounting angle range, half shafts with adapted lengths are made and assembled in groups, and then the angles between the horizontal and vertical planes of the half shafts on both sides corresponding to the mounting angle are recorded; the drivability of the whole vehicle with different assembly mounting angles is tested using a dedicated drivability evaluation software; after completing all mounting angle tests, the test data is processed, and the test condition results are scored using the drivability evaluation software to select the mounting scheme with the best drivability. The present invention can confirm important conditions such as the suspension form, the half shaft level, and the front-rear angle in the vehicle model development stage, and lay a good foundation for having an excellent driving experience after the assembly is installed.

Description

Technical Field

[0001] The invention belongs to the technical field of vehicle performance testing, and in particular relates to a method for testing the influence of the mounting angle of a front-drive vehicle assembly on the drivability of the entire vehicle. Background Art

[0002] As competition in the automobile market becomes increasingly fierce, the development cycle of new models has been repeatedly compressed, from more than 4 years to the current 1-2 years. Consumers' requirements for vehicle drivability and comfort are also constantly increasing. This requires that in the early stage of vehicle development, when determining important conditions such as the assembly mounting angle and the power line transmission direction, the above important conditions must be taken into account, which will affect the vehicle drivability and comfort that will only be reflected in the later stage of the project. Otherwise, in the later stage of the project, it is found that the vehicle has deficiencies in driving experience, and these deficiencies are caused by problems with the assembly mounting angle or power line layout. At this time, adjustments to the overall layout will waste a lot of resources and take up valuable R&D time. Therefore, it is necessary to make the two reflect the correlation as soon as possible and make the best choice in the early stage of the project. Therefore, there is an urgent need for a test method that can quickly and effectively verify the impact of the assembly mounting angle on the drivability of the whole vehicle in the early stage of front-engine front-wheel drive vehicle development. Summary of the invention

[0003] The purpose of the present invention is to solve the above problems existing in the prior art and to provide a method for testing the influence of the mounting angle of a front drive assembly on the drivability of the whole vehicle.

[0004] The testing method of the present invention can be used to confirm important conditions such as suspension form, half-axle level, front-to-back angle, etc. during the vehicle model development stage, and lay a good foundation for excellent driving experience after the assembly is installed. To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A method for testing the effect of the mounting angle of a front-drive vehicle assembly on the drivability of the vehicle, the method comprising the following steps:

[0006] Step 1: Make five different sets of active ends of left and right suspensions and rear suspensions according to the assembly mounting angle range; the assembly mounting angle range is 15° forward to 15° backward;

[0007] Step 2: According to the above assembly mounting angle range, half shafts with matching lengths are manufactured and assembled in groups. Afterwards, the angles between the horizontal and vertical planes of the half shafts on both sides corresponding to the mounting angle are recorded;

[0008] Step 3: Use dedicated drivability evaluation software to conduct drivability tests on vehicles with different assembly mounting angles;

[0009] Step 4. After completing all the mounting angle tests, the test data is processed, and the test condition results are scored through the drivability evaluation software. The program code, mounting angle, each condition score, and total score are statistically analyzed and compared horizontally to select the mounting program with the best drivability. In step 3, the drivability test includes Engine start test, Power on upshift test, Tip in downshift test and Hill start test. The Engine start test is an engine start test under cold car, hot car and air conditioning on / off conditions. The Power on upshift test is a fixed throttle sequence upshift test starting from 0 vehicle speed. The Tip in downshift test is a downshift test with different increases in the throttle pedal opening at different vehicle speeds and initial gear positions. The Hill start test is a start test in D and R gears at different slopes at 0 vehicle speed.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] 1. The present invention can be used to confirm important conditions such as suspension form, half-axle level, front-rear angle, etc. during the vehicle development stage, and lay a good foundation for excellent driving experience after the assembly is installed. DETAILED DESCRIPTION

[0012] Specific implementation method 1: This implementation method discloses a test method for the influence of the mounting angle of the front drive assembly on the driving performance of the whole vehicle, and the method steps are as follows:

[0013] Step 1: Make five different sets of active ends of left and right suspensions and rear suspensions according to the assembly mounting angle range; the assembly mounting angle range is 15° forward to 15° backward;

[0014] Step 2: According to the above assembly mounting angle range, half shafts with matching lengths are manufactured and assembled in groups. Afterwards, the angles between the horizontal and vertical planes of the half shafts on both sides corresponding to the mounting angle are recorded;

[0015] Step 3: Use dedicated drivability evaluation software to conduct drivability tests on vehicles with different assembly mounting angles;

[0016] Step 4. After completing all the mounting angle tests, the test data is processed, and the test condition results are scored through the drivability evaluation software. The program code, mounting angle, each condition score, and total score are statistically analyzed and compared horizontally to select the mounting program with the best drivability. In step 3, the drivability test includes Engine start test, Power on upshift test, Tip in downshift test and Hill start test. The Engine start test is an engine start test under cold car, hot car and air conditioning on / off conditions. The Power on upshift test is a fixed throttle sequence upshift test starting from 0 vehicle speed. The Tip in downshift test is a downshift test with different increases in the throttle pedal opening at different vehicle speeds and initial gear positions. The Hill start test is a start test in D and R gears at different slopes at 0 vehicle speed.

[0017] The present invention is applicable to front-engine front-wheel drive models. It needs to be installed on the powertrain mule car and meet the driving performance evaluation conditions. Five sets of different left and right suspensions and active ends of the rear suspension are made according to the assembly mounting angle range (according to 15° forward tilt to 15° backward tilt), and half shafts with matching lengths are made according to the above-mentioned mounting angle range for assembly, and the angles of the horizontal and vertical planes of the half shafts on both sides corresponding to the mounting angle are recorded. After the assembly is completed, the whole vehicle with different assembly mounting angles is tested for driving performance. The test includes Engine start (engine start), Power on upshift (fixed throttle sequence upshift, 10% step length), Tip in downshift (different gears refueling downshift), Hill start (starting at different slopes) and other working conditions. The above working conditions should cover more than 95% of the whole vehicle driving conditions. After completing all the mounting angle tests, the test data is processed, the test condition results are scored by the driving performance evaluation software (AVL-Drive objective driving performance evaluation system), and the test results are compared horizontally, and finally the mounting angle with the best driving performance is selected.

[0018] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0019] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for testing the effect of the mounting angle of a front-drive vehicle assembly on the drivability of the vehicle, characterized in that: The method steps are: Step 1: Make five different sets of active ends of left and right suspensions and rear suspensions according to the assembly mounting angle range; the assembly mounting angle range is 15° forward to 15° backward; Step 2: According to the above assembly mounting angle range, half shafts with matching lengths are manufactured and assembled in groups. Afterwards, the angles between the horizontal and vertical planes of the half shafts on both sides corresponding to the mounting angle are recorded; Step 3: Use dedicated drivability evaluation software to conduct drivability tests on vehicles with different assembly mounting angles; Step 4. After completing all the mounting angle tests, the test data is processed, and the test condition results are scored through the drivability evaluation software. The program code, mounting angle, each condition score, and total score are statistically analyzed and compared horizontally to select the mounting program with the best drivability. In step 3, the drivability test includes Engine start test, Power on upshift test, Tip in downshift test and Hill start test. The Engine start test is an engine start test under cold car, hot car and air conditioning on / off conditions. The Power on upshift test is a fixed throttle sequence upshift test starting from 0 vehicle speed. The Tip in downshift test is a downshift test with different increases in the throttle pedal opening at different vehicle speeds and initial gear positions. The Hillstart test is a start test in D and R gears at different slopes at 0 vehicle speed.