Method for testing curve control performance of non-full-size spare tire of sedan
By conducting curve testing in the dynamic square and wet ring test venues, the control performance of non -full -size spare tires is evaluated, the existing test method is difficult to evaluate the problem of curve the control and stability of the curve, and the more accurate performance limit is achieved. Evaluation and spare tire design quality improves.
Patent Information
- Application Number
- CN202411409248.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-01-28
AI Technical Summary
The existing non-full-size spare tire test methods mainly focus on the evaluation of linear driving performance. There is no systematic and comprehensive testing method to effectively evaluate the performance of non-full-size spare tires in corner handling and stability, especially Under extreme operating conditions.
Adopt a car non -full -size spare tire curve control performance test method. By conducting curve testing in the dynamic square and wet ring test venues, different scheme spare tires are installed on the left and left rear wheels, and measurement is measured. The vehicle's tailing speed in the circle test is to evaluate the handling performance of the spare tire.
This method can scientifically and systematically evaluate the control performance of non -full -size spare tires under different road conditions, especially the stability of the vehicle under the limit state, provides more accurate performance limit assessment to help improve the design quality and the design quality and of the spare tires Driving safety.
Smart Images
Figure CN119374933A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of tire performance testing, and in particular to a method for testing the cornering handling performance of a non-full-size spare tire for a car. Background Art
[0002] With the rapid development of the automobile industry, tires, as an important part of automobiles, directly affect the driving safety and stability of vehicles. During normal driving, tires may fail due to unexpected conditions such as blowouts or punctures, and spare tires become the first choice to restore driving capabilities. However, due to cost control and space optimization considerations, many vehicles are equipped with non-full-size spare tires instead of full-size spare tires.
[0003] The size, quality and structure of a non-full-size spare tire are significantly different from those of a standard tire, which directly affects the vehicle's driving performance, especially when the vehicle is turning or driving in rainy weather. After replacing a vehicle with a non-full-size spare tire, the vehicle's handling and stability may be reduced due to the reduced contact area between the tire and the road, especially in extreme conditions such as sharp turns and slippery roads, which poses a great challenge to the vehicle's safety.
[0004] Most of the existing non-full-size spare tire test methods focus on the evaluation of straight-line driving performance. There is no systematic and comprehensive test method to effectively evaluate the performance of non-full-size spare tires in terms of cornering handling and stability. Especially under extreme operating conditions, such as sharp turns on slippery roads, vehicles are prone to side slipping or tail swinging. These extreme situations urgently need to be evaluated and optimized through scientific test methods. Summary of the invention
[0005] In order to deal with the above problems, the industry urgently needs a method that can objectively test and evaluate the cornering control performance and stability performance of different non-full-size spare tires under professional test site conditions. Through systematic test data, it can provide a scientific basis for the research and development and improvement of non-full-size spare tires, and also provide a decision-making reference for vehicle OEMs in spare tire selection to ensure vehicle driving safety.
[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: A method for testing the cornering handling performance of a non-full-size spare tire of a car, the method being implemented by the following steps: 1) Install three main tires on a vehicle, and then install spare tires of different designs on the left front and left rear wheel positions respectively; 2) Select a tire test site, including two test sites: a dynamic square and a wet ring. The dynamic square is a dry asphalt road surface, and the wet ring is a wet asphalt road surface; 3) Dry lap evaluation of the left front wheel A spare tire is installed on the left front wheel of the vehicle, and main tires are installed on the other three wheels. The vehicle is accelerated from 0 along the circumference with a radius of 100m on the dynamic square, and the vehicle is kept in a stable state. The vehicle is accelerated to a certain moment when it drifts out, and the test is stopped, and the speed at this time is recorded; 4) Dry ground lap evaluation of the left rear wheel A spare tire is installed on the left rear wheel of the vehicle, and main tires are installed on the other three wheels. The vehicle is accelerated from 0 along the circumference with a radius of 100m on the dynamic square, and the vehicle is kept in a stable state. The vehicle is accelerated to a certain moment when it drifts out, and the test is stopped, and the speed at this time is recorded; 5) Evaluation of left front wheel wetland circling A spare tire is installed on the left front wheel of the vehicle, and main tires are installed on the other three wheels. The vehicle is accelerated from 0 along the circumference with a radius of 40m on a wet circle, so that the vehicle always maintains a stable state. The vehicle accelerates to a certain moment when it skids, and the test is stopped and the vehicle speed at this time is recorded.
[0007] 6) Evaluation of left rear wheel wetland circling A spare tire is installed on the left rear wheel of the vehicle, and main tires are installed on the other three wheels. Under standard air pressure conditions, the vehicle is accelerated along the circumference of a wet ring with a radius of 40m starting from 0, so that the vehicle always maintains a stable state. The vehicle accelerates to a certain moment when it skids, and the test is stopped and the vehicle speed at this time is recorded.
[0008] Preferably, the air pressure of the non-full-size spare tire is set to 420 kPa, and the air pressures of the other three main tires are set to standard pressures.
[0009] Preferably, the test vehicle is an accident-free vehicle with a short mileage and a good vehicle condition, and a calibration check is performed on the vehicle condition, and adjustments are made and recorded as necessary.
[0010] Preferably, the load condition of the vehicle is set according to the load specified by the OEM. When no condition is specified, the load is the total weight of the vehicle plus the weight of the driver.
[0011] Preferably, at least two non-full-size spare tires are prepared for each test, and the tires are preheated before testing at a speed of 80 km / h and a driving distance of 10 kilometers to ensure that the tires are in optimal working condition.
[0012] The present invention adopts the above technical solution to provide a method for testing the cornering handling performance of a non-full-size spare tire, which is intended to effectively evaluate the handling and stability of a non-full-size spare tire under extreme conditions. Compared with the prior art, the method has the following significant technical effects: 1. Scientific and systematic testing process: By testing the cornering handling performance on professional test sites (such as dynamic squares and wetland roundabouts), the present invention can systematically evaluate the handling performance of non-full-size spare tires under different road conditions, especially the stability of the vehicle under extreme conditions. Through testing on two typical road conditions, dry and wet, the performance of the spare tire in various driving environments can be fully reflected.
[0013] 2. Accurate evaluation of extreme handling performance: This method evaluates the handling performance of the spare tire by measuring the critical speed of the vehicle in the lap test. This critical speed directly reflects the stability level of the spare tire under extreme operating conditions, providing a clear quantitative indicator for the evaluation of the spare tire's handling performance. Compared with existing testing methods, the present invention can more accurately determine the performance limit of the spare tire.
[0014] 3. Targeted design of spare tire test conditions: The present invention adopts special test conditions based on the characteristics of non-full-size spare tires, including testing at the left front wheel position and the left rear wheel position respectively, and setting the air pressure of 420kPa to ensure that the test conditions meet the actual application scenario. This targeted design can better simulate the performance of the spare tire in actual use and improve the accuracy and reliability of the test.
[0015] 4. Applicable to various spare tire test schemes: This test method is universal and can be applied to non-full-size spare tires of different specifications. By replacing spare tires and repeating the test, the handling performance of different spare tires under extreme conditions can be comprehensively compared, thus providing a scientific basis for the selection, design and improvement of spare tires. This technical effect provides effective guidance for the development work of spare tire manufacturers and automobile OEMs.
[0016] 5. Improve vehicle driving safety: By adopting this test method, the handling stability of non-full-size spare tires can be accurately evaluated, thereby helping to improve the design quality of spare tires. This will help improve the safety of spare tires, especially in ensuring sufficient driving stability when the vehicle encounters an emergency, thus providing protection for consumers' driving safety.
[0017] In summary, the present invention overcomes the shortcomings of the prior art in the spare tire cornering handling performance test through a systematic and scientific testing process, effectively improves the performance evaluation accuracy of non-full-size spare tires under extreme operating conditions, provides strong support for the design and selection of spare tires, and improves the driving safety of vehicles. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 This is the road condition tested by the present invention. DETAILED DESCRIPTION
[0019] 1.1 Test methods 1.1.1 Purpose Developed to evaluate the cornering handling and stability performance of non-full-size spare tires.
[0020] 1.1.2 Test conditions 1.1.2.1 Test site Central Asia Proving Ground and other designated professional tire testing grounds.
[0021] 1.1.2.2 Test road surface It includes two testing sites: a dynamic square and a wet circle. The dynamic square is a dry asphalt road surface and the wet circle is a wet asphalt road surface.
[0022] 1.1.2.3 Test vehicle The test vehicle shall be subject to the designated vehicle. If the designated vehicle cannot be found, the production vehicle or the vehicle under development (vehicle with short mileage and accident-free) with the closest characteristics and conditions can be selected for testing according to the requirements. The vehicle is in good condition, and the vehicle status is calibrated and checked. Adjustments are made and recorded as necessary.
[0023] 1.1.2.4 Vehicle load It is executed according to the load conditions specified by the OEM. If no load conditions are specified, the vehicle load defaults to the vehicle's gross weight plus the weight of the driver.
[0024] 1.1.2.5 Test tire preparation Prepare at least 2 test tires for each plan. After the tire rims are installed, warm up the tires appropriately. Before the test, carry out warm-up driving. Do not apply excessive front and rear lateral forces. Drive on a paved road at a speed of 80km / h for 10km. Ensure that the vehicle and tires are in good condition.
[0025] 1.1.3 Test items and methods 1.1.3.1 Dry lap evaluation of the left front wheel A spare tire is installed on the left front wheel of the vehicle with the wheel pressure at 420kpa. The main tires are installed on the other three wheels. All tires are under standard air pressure conditions. The vehicle is accelerated to circle along the circumference with a radius of 100m on the dynamic square from 0. The vehicle is kept in a stable state at all times. The vehicle accelerates to a certain moment when it skids. The test is stopped and the speed at this time is recorded.
[0026] 1.1.3.2 Evaluation of left rear wheel dry lap A spare tire is installed on the left rear wheel of the vehicle with the wheel pressure at 420kpa. The main tires are installed on the other three wheels. All of them are under standard air pressure. The vehicle is accelerated to circle along the circumference with a radius of 100m on the dynamic square from 0. The vehicle is kept in a stable state at all times. The vehicle accelerates to a certain moment when it skids. The test is stopped and the speed at this time is recorded.
[0027] 1.1.3.3 Evaluation of left front wheel wetland circling A spare tire is installed on the left front wheel of the vehicle with the wheel pressure at 420kpa. Main tires are installed on the other three wheel positions. All tires are under standard air pressure conditions and are accelerated around the circumference of a wet ring with a radius of 40m starting from 0. The vehicle is kept in a stable state at all times. The vehicle is accelerated to a certain moment when it skids. The test is stopped and the vehicle speed at this time is recorded.
[0028] 1.1.3.4 Evaluation of left rear wheel wetland circling A spare tire is installed on the left rear wheel of the vehicle with the wheel pressure at 420kpa. Main tires are installed on the other three wheel positions. All tires are under standard air pressure conditions and are accelerated along the circumference of a wet ring with a radius of 40m from 0. The vehicle is kept in a stable state at all times. The vehicle is accelerated to a certain moment when it skids. The test is stopped and the vehicle speed at this time is recorded.
[0029] A specific test example is provided below to clearly and completely describe the technical solution in the embodiment.
[0030] 1. Description of the plan Test description: Volkswagen non-full-size spare tire development and improvement project (test site: Central Asia test site).
[0031] 2. Experimental Description Test model: Volkswagen Touron Test sequence: 2 tires for each scheme, evaluate the cornering handling performance of the non-full-size spare tire; Test requirements: Normal tire pressure when unloaded is 240kpa; when fully loaded, the front wheel pressure is 240kpa, the rear wheel pressure is 290kpa, the right front and left rear pressures are 420kpa, load: half load + full load; After installing the test tires on the vehicle, start the test each time after preheating the tires; test according to the above 1.1.3 method and keep records.
[0032] 3. Road conditions Comprehensive road of the test site (smooth asphalt road), such as Figure 1 shown.
[0033] 4. Test results Test results: According to the qualified speed standards given by the OEM and compared with the reference tires, based on the tire evaluation performance, the tires developed this time all meet the spare tire handling and stability requirements, providing guidance for further supporting development and improvement and providing safety protection.
[0034] The above is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will conform to the widest range consistent with the principles and novelties disclosed herein.
Claims
1. A method for testing the cornering handling performance of a non-full-size spare tire of a car, characterized in that: The method is implemented by the following steps: 1) Install three main tires on a vehicle, and then install spare tires of different designs on the left front and left rear wheel positions respectively; 2) Select a tire test site, including two test sites: a dynamic square and a wet ring. The dynamic square is a dry asphalt road surface, and the wet ring is a wet asphalt road surface; 3) Dry lap evaluation of the left front wheel A spare tire is installed on the left front wheel of the vehicle, and main tires are installed on the other three wheels. The vehicle is accelerated from 0 along the circumference with a radius of 100m on the dynamic square, and the vehicle is kept in a stable state. The vehicle is accelerated to a certain moment when it drifts out, and the test is stopped, and the speed at this time is recorded; 4) Dry ground lap evaluation of the left rear wheel A spare tire is installed on the left rear wheel of the vehicle, and main tires are installed on the other three wheels. The vehicle is accelerated from 0 along the circumference with a radius of 100m on the dynamic square, and the vehicle is kept in a stable state. The vehicle is accelerated to a certain moment when it drifts out, and the test is stopped, and the speed at this time is recorded; 5) Evaluation of left front wheel wetland circling A spare tire is installed on the left front wheel of the vehicle, and main tires are installed on the other three wheels. The vehicle is accelerated from 0 to circle along the circumference with a radius of 40m on a wet circle, and the vehicle is kept in a stable state. The vehicle is accelerated to a certain moment when it drifts out, and the test is stopped, and the speed at this time is recorded; 6) Evaluation of left rear wheel wetland circling A spare tire is installed on the left rear wheel of the vehicle, and main tires are installed on the other three wheels. Under standard air pressure conditions, the vehicle is accelerated along the circumference of a wet ring with a radius of 40m starting from 0, so that the vehicle always maintains a stable state. The vehicle accelerates to a certain moment when it skids, and the test is stopped and the vehicle speed at this time is recorded.
2. The method according to claim 1, characterized in that: The air pressure of the non-full-size spare tire is set to 420 kPa, and the air pressure of the other three main tires is set to standard pressure.
3. The method according to claim 1 or 2, characterized in that: The test vehicle is an accident-free vehicle with a short mileage and a good vehicle condition. The vehicle condition is calibrated and checked, and adjustments are made and recorded as necessary.
4. The method according to claim 1, characterized in that: The vehicle's load condition is set according to the load specified by the OEM. When no condition is specified, the load is the gross vehicle weight plus the driver's weight.
5. The method according to claim 1, characterized in that At least two non-full-size spare tires are prepared for each test. The tires are preheated before the test at a speed of 80 km / h and a driving distance of 10 kilometers to ensure that the tires are in the best working condition.