A test method and evaluation method for the continuous ramp starting ability of a passenger car

Abstract

The present invention belongs to the field of passenger vehicles, and discloses a test method and an evaluation method for the continuous ramp starting ability of a passenger vehicle. Step 1: Set the experimental environmental conditions; Step 2: Set the positions of temperature sensors; Step 3: Based on the limiting conditions of Step 1 and Step 2, conduct a continuous ramp starting ability test for a passenger vehicle with a time interval of no more than 40 s for each start, and the vehicle completes 20 ramp starts. Aiming at the problem that there is a lack of a test method for evaluating the continuous ramp starting ability of passenger vehicles in the industry, and when the vehicles of users on the market start continuously on a ramp, there are situations where they cannot start and the climbing vehicle speed is limited, resulting in complaints and complaints from users.

Description

Technical Field

[0001] The present invention belongs to the field of passenger vehicles, and particularly relates to a test method and an evaluation method for the continuous ramp starting ability of passenger vehicles. Background Art

[0002] At present, the test methods for evaluating the ramp starting ability only involve whether the vehicle can start successfully on relevant slopes. There is still insufficient research on the ability of continuous multiple starts, whether there is decline and failure in the ability, and whether it meets the user's usage requirements. Due to the lack of a test method for evaluating the continuous ramp starting ability of passenger vehicles in the industry, when users' vehicles on the market make continuous starts on ramps, there are situations where they cannot start and the climbing vehicle speed is limited, resulting in user complaints. In order to evaluate the continuous ramp starting ability of passenger vehicles at the product R & D stage to meet the user's usage requirements, the present invention summarizes a test and evaluation method for the continuous ramp starting ability of passenger vehicles through the classification and summary of a large number of tests and the analysis of the actual usage conditions of users, filling the gap in the test and evaluation methods in the relevant fields of vehicle manufacturers. Summary of the Invention

[0003] The present invention provides a test method and an evaluation method for the continuous ramp starting ability of passenger vehicles, aiming at the problems that due to the lack of a test method for evaluating the continuous ramp starting ability of passenger vehicles in the industry, when users' vehicles on the market make continuous starts on ramps, there are situations where they cannot start and the climbing vehicle speed is limited, resulting in user complaints.

[0004] The present invention is achieved through the following technical solutions:

[0005] A test method for the continuous ramp starting ability of passenger vehicles, the starting ability test specifically includes the following steps:

[0006] Step 1: Set the experimental environmental conditions;

[0007] Step 2: Set the position of the temperature sensor;

[0008] Step 3: Based on the limiting conditions of Step 1 and Step 2, conduct a continuous ramp starting ability test for passenger vehicles where the time interval for each start does not exceed 40 s and the vehicle completes 20 ramp starts.

[0009] A test method for the continuous ramp starting ability of passenger vehicles, the specific content of Step 1 includes the following limiting conditions:

[0010] A ramp with a slope of 30%, the length of the test section of the ramp is not less than 20 m, there are transition sections at the front and rear of the test section, and the road surface should be a paved road surface that is flat, solid, dry, and has a uniform slope;

[0011] During the test, there should be no fog, rain or hail, the average wind speed should not be greater than 3 m / s, the gust wind speed should not be greater than 5 m / s, and the ambient temperature should not be lower than 25 °C;

[0012] The test mass is the maximum designed total mass;

[0013] The error of the cold inflation pressure of the tire does not exceed 10 kPa.

[0014] A test method for the continuous ramp start ability of a passenger car. During the test, the measured parameters and their accuracies are specifically as follows: the time error is not greater than ±0.1 s, the length error of the ramp of the test section is not greater than ±0.1 m, the temperature error is not greater than ±0.1 °C, the atmospheric pressure error is not greater than ±1 kPa, the speed error is not greater than ±0.1 km / h, the error is not greater than ±5 kg when the mass ≤ 3500 kg, and the error is not greater than ±10 kg when the mass > 3500 kg.

[0015] A test method for the continuous ramp start ability of a passenger car. The limiting conditions for the position of the temperature sensor in step 2 are specifically as follows

[0016] Installed at a height of 1.5 m on the vehicle, away from heat sources, ventilated and without direct sunlight, for measuring the ambient temperature;

[0017] Installed at the center of the engine water outlet rubber hose, for measuring the engine water outlet temperature;

[0018] Installed at the center of the engine radiator water outlet rubber hose, for measuring the engine inlet water temperature;

[0019] Installed inside the transmission oil pan, for measuring the transmission lubricating oil temperature;

[0020] Installed inside the drive axle oil pan, for measuring the drive axle lubricating oil temperature.

[0021] A test method for the continuous ramp start ability of a passenger car. The limiting conditions for the position of the temperature sensor also include being installed at the center of the connection cavity of the oil pressure induction plug, for measuring the main oil gallery oil temperature;

[0022] Installed at the oil drain bolt of the oil pan, for measuring the oil pan oil temperature;

[0023] Take the higher of the main oil gallery oil temperature and the oil pan oil temperature as the engine oil temperature;

[0024] When the passenger car has a separate transfer case, a temperature sensor should be installed in the transfer case, and the higher of the transmission lubricating oil temperature and the transfer case lubricating oil temperature is taken as the transmission lubricating oil temperature.

[0025] A test method for the continuous ramp start ability of a passenger car. Step 3 of the continuous ramp start ability test of the passenger car includes the following steps:

[0026] Step 3.1: Conduct pre - driving warm - up of the vehicle to make the engine oil temperature and transmission lubricating oil temperature reach above 90°C and be in a balanced state;

[0027] Step 3.2: Use the service brake to stop the vehicle at a position 10 m away from the top of the slope on the test section of the test ramp;

[0028] Step 3.3: If the slope at which the vehicle can successfully start is 30%, conduct the test normally. If the maximum slope at which the vehicle can successfully start is less than 30%, the test should be conducted on the ramp corresponding to the maximum slope at which the vehicle can successfully start;

[0029] Step 3.4: Release the brake pedal and immediately step on the accelerator pedal to climb the slope, so that the vehicle completely climbs to the top of the slope, and record the maximum vehicle speed that can be reached by the vehicle on the test section;

[0030] Step 3.5: During the starting process, the atmospheric pressure, time, distance, height, vehicle speed, engine speed and various temperature parameters should be recorded simultaneously. For any abnormal phenomena occurring during the starting process, detailed records need to be made;

[0031] Step 3.6: If the test vehicle fails to start climbing within 5 s after stepping on the accelerator pedal, it is considered that the starting ability fails. If the maximum vehicle speed on the test section cannot reach 60% of the maximum vehicle speed during the first slope start, it is considered that the starting ability declines;

[0032] Step 3.7: Repeat steps 3.3 - 3.6, with the time interval between each start not exceeding 40 s, until the vehicle completes 20 slope starts;

[0033] Step 3.8: If the starting ability fails or the starting ability declines before the vehicle completes 20 slope starts, stop the test and record the number of slope starts that have been completed;

[0034] Step 3.9: During the test, if the engine coolant shows the phenomenon of "boiling over" or the engine oil temperature and transmission lubricating oil temperature exceed the limit values, the test should also be stopped, and the number of slope starts that have been completed should be recorded.

[0035] A test method for the continuous slope starting ability of a passenger car. The continuous slope starting ability test of the vehicle in step 3 further includes:

[0036] If the test vehicle has a hill - start assist function, the relevant function should be turned on;

[0037] Use the automatic shift mode, and tests should be conducted for both the forward and reverse gears. For four - wheel - drive vehicles, use all - wheel drive.

[0038] A test method for the continuous ramp start ability of a passenger car. If there is no corresponding test ramp gradient, compensation is made by modifying the mass ΔM. The modified mass is calculated according to the following formula:

[0039]

[0040] In the formula: ΔM is the modified mass; M is the maximum designed total mass; a0 is the actual used ramp gradient angle; a1 is the specified test ramp gradient angle; R is the rolling resistance coefficient, taking 0.01; when the calculated modified mass ΔM is positive, load should be increased, and when it is negative, load should be decreased.

[0041] An evaluation method for the continuous ramp start ability of a passenger car, which is based on the above-mentioned test method for the continuous ramp start ability of a passenger car;

[0042] If the vehicle can complete 20 ramp starts and no start ability failure or start ability decline occurs, it is considered that the vehicle has excellent continuous ramp start ability;

[0043] If the vehicle can complete 15 ramp starts and no start ability failure or start ability decline occurs, but start ability failure or start ability decline occurs before completing 20 ramp starts, it is considered that the vehicle's continuous ramp start ability is qualified and can basically meet the user's usage requirements;

[0044] If the vehicle has start ability failure or start ability decline before completing 15 ramp starts, it is considered that the vehicle's continuous multiple ramp start ability is unqualified.

[0045] An evaluation method for the continuous ramp start ability of a passenger car. If the vehicle can complete at most 15 ramp starts or has start ability failure or start ability decline before completing 15 ramp starts, the vehicle manufacturer should adjust the vehicle to make it at least meet 15 ramp starts and no start ability failure or start ability decline occurs.

[0046] The beneficial effects of the present invention are:

[0047] The present invention is used to determine the ability of a passenger car to start continuously on a ramp, and to judge whether there is a decline and failure in the start ability and whether it can meet the user's usage requirements.

[0048] The present invention can improve the standardization and standard level of vehicle development verification, judge whether the vehicle meets the engineering target requirements and can meet the user's usage requirements, can improve the product quality, and reduce the quality risk after the product is put on the market.

[0049] The present invention has the advantages of moderate working condition intensity, easy implementation of the method, easy satisfaction of conditions, objective and systematic data, and sufficient and appropriate verification. Description of the Drawings

[0050] Figure 1 It is a schematic diagram of the test road of the present invention.

[0051] Figure 2 It is a schematic diagram of stopping the vehicle with the service brake at a position 10 m away from the top of the slope on the test ramp section of the present invention.

[0052] Figure 3 It is a schematic diagram of the vehicle completely climbing to the top of the slope of the present invention. Detailed implementation manners

[0053] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0054] A test method for the continuous ramp starting ability of a passenger car, wherein the starting ability test specifically includes the following steps:

[0055] Step 1: Set the experimental environmental conditions;

[0056] Step 2: Set the positions of the temperature sensors;

[0057] Step 3: Based on the limiting conditions of Step 1 and Step 2, conduct a test on the continuous ramp starting ability of a passenger car in which the time interval for each start does not exceed 40 s and the vehicle completes 20 ramp starts.

[0058] A test method for the continuous ramp starting ability of a passenger car, wherein Step 1 specifically includes the following limiting conditions:

[0059] A ramp with a slope of 30%, the length of the test section of the ramp is not less than 20 m, there are transition sections at the front and rear of the test section, and the road surface should be a paved road surface that is flat, solid, dry, and has a uniform slope;

[0060] There should be no fog, rain or hail during the test, the average wind speed is not greater than 3 m / s, the gust wind is not greater than 5 m / s, and the ambient temperature is not lower than 25 °C;

[0061] The test mass is the maximum designed total mass;

[0062] The error of the cold inflation pressure of the tires does not exceed 10 kPa.

[0063] A test method for the continuous ramp start ability of a passenger car. During the test, the measured parameters and their accuracies are specifically as follows: the time error is not greater than ±0.1 s, the length error of the ramp in the test section is not greater than ±0.1 m, the temperature error is not greater than ±0.1 °C, the atmospheric pressure error is not greater than ±1 kPa, the speed error is not greater than ±0.1 km / h, the error is not greater than ±5 kg when the mass ≤ 3500 kg, and the error is not greater than ±10 kg when the mass > 3500 kg.

[0064] During the test, the measured parameters, their units, and the accuracy requirements are shown in Table 1.

[0065] Table 1 Measured parameters, their units, and accuracies

[0066]

[0067]

[0068] A test method for the continuous ramp start ability of a passenger car. The specific limiting conditions for the position of the temperature sensor in step 2 are as follows.

[0069] Installed at a height of 1.5 m from the vehicle, away from heat sources, ventilated, and without direct sunlight, for measuring the ambient temperature;

[0070] Installed at the center of the engine water outlet rubber hose, for measuring the engine water outlet temperature;

[0071] Installed at the center of the engine radiator water outlet rubber hose, for measuring the engine inlet water temperature;

[0072] Installed inside the transmission oil pan, for measuring the transmission lubricating oil temperature;

[0073] Installed inside the drive axle oil pan, for measuring the drive axle lubricating oil temperature.

[0074] A test method for the continuous ramp start ability of a passenger car. The limiting conditions for the position of the temperature sensor also include being installed at the center of the connection cavity of the oil pressure sensing plug, for measuring the main oil gallery oil temperature;

[0075] Installed at the oil drain bolt of the oil pan, for measuring the oil pan oil temperature;

[0076] Take the higher temperature of the main oil gallery oil temperature and the oil pan oil temperature as the engine oil temperature;

[0077] When the passenger car has a separate transfer case, a temperature sensor should be installed inside the transfer case, and take the higher temperature of the transmission lubricating oil temperature and the transfer case lubricating oil temperature as the transmission lubricating oil temperature.

[0078] A test method for the continuous ramp start ability of a passenger car. The continuous ramp start ability test of the passenger car in step 3 includes the following steps:

[0079] Step 3.1: Conduct preheating driving of the vehicle to make the engine oil temperature and transmission lubricating oil temperature reach above 90°C and be in a balanced state;

[0080] Step 3.2: Use the service brake to stop the vehicle at a position 10 m away from the top of the slope on the test section of the test ramp; as Figure 2 shown;

[0081] Step 3.3: If the maximum slope at which the vehicle can successfully start is 30%, conduct the test normally. If the maximum slope at which the vehicle can successfully start is less than 30%, the test should be conducted on the ramp corresponding to the maximum slope at which the vehicle can successfully start;

[0082] Step 3.4: Release the brake pedal and immediately step on the accelerator pedal to climb the slope, so that the vehicle completely climbs to the top of the slope, as Figure 3 shown, and record the maximum vehicle speed that the vehicle can reach on the test section;

[0083] Step 3.5: During the starting process, the atmospheric pressure, time, distance, height, vehicle speed, engine speed and various temperature parameters should be recorded simultaneously. For abnormal phenomena occurring during the starting process, detailed records need to be made;

[0084] Step 3.6: If the test vehicle fails to start climbing within 5 s after stepping on the accelerator pedal, it is considered that the starting ability fails. If the maximum vehicle speed on the test section cannot reach 60% of the maximum vehicle speed during the first slope start, it is considered that the starting ability declines;

[0085] Step 3.7: Repeat Steps 3.3 to 3.6, and the time interval between each start should not exceed 40 s until the vehicle completes 20 slope starts;

[0086] Step 3.8: If the starting ability fails or the starting ability declines before the vehicle completes 20 slope starts, stop the test and record the number of slope starts that have been completed;

[0087] Step 3.9: During the test, if the engine coolant shows the phenomenon of "boiling over" or the engine oil temperature and transmission lubricating oil temperature exceed the limit, the test should also be stopped and the number of slope starts that have been completed should be recorded.

[0088] A test method for the continuous slope starting ability of a passenger car, the continuous slope starting ability test of the vehicle in Step 3 further includes:

[0089] If the test vehicle has a slope assist function, the relevant function should be turned on;

[0090] Use the automatic shift mode, and tests should be conducted for both the forward gear and the reverse gear. For four-wheel drive vehicles, use all-wheel drive.

[0091] A test method for the continuous ramp start ability of a passenger car. If there is no corresponding test ramp gradient, compensation is made by modifying the mass ΔM, and the modified mass is calculated according to the following formula:

[0092]

[0093] In the formula: ΔM is the modified mass, with the unit of kilogram (kg); M is the maximum designed total mass, with the unit of kilogram (kg); a0 is the actual used ramp gradient angle, with the unit of degree (°); a1 is the specified test ramp gradient angle, with the unit of degree (°);

[0094] R is the rolling resistance coefficient, taking 0.01;

[0095] When the calculated modified mass ΔM is positive, load should be added; when it is negative, load should be reduced.

[0096] An evaluation method for the continuous ramp start ability of a passenger car, and the evaluation method is based on the test method for the continuous ramp start ability of a passenger car;

[0097] If the vehicle can complete 20 ramp starts and no start ability failure or start ability decline occurs, it is considered that the vehicle has excellent continuous ramp start ability;

[0098] If the vehicle can complete 15 ramp starts and no start ability failure or start ability decline occurs, but start ability failure or start ability decline occurs before completing 20 ramp starts, it is considered that the vehicle has qualified continuous ramp start ability and can basically meet the user's usage requirements;

[0099] If the vehicle has start ability failure or start ability decline before completing 15 ramp starts, it is considered that the vehicle's continuous multiple ramp start ability is unqualified.

[0100] An evaluation method for the continuous ramp start ability of a passenger car. If the vehicle can complete at most 15 ramp starts or has start ability failure or start ability decline before completing 15 ramp starts, the vehicle manufacturer should adjust the vehicle to make it at least meet 15 ramp starts and no start ability failure or start ability decline occurs.

[0101] The test conditions of the present invention are based on the results of user and market research and the test experience in the product development process, and typical test conditions are summarized;

[0102] 30% of the gradient of the test ramp of the present invention is the best gradient summarized according to the results of user and market research and test experience;

[0103] The driving distance of 10 m on the test ramp test section of the present invention is the best distance summarized according to the results of user and market research and test experience;

[0104] The evaluation method of the present invention is the best method summarized from the results of user and market research and experimental experience, and can represent the usage requirements of the most demanding users;

[0105] The full load of the test load of the present invention is the best load summarized from the results of user and market research and experimental experience, and can cover the usage conditions of the most demanding users.

Claims

1. A test method for the continuous ramp start ability of a passenger car, characterized in that, The specific starting ability test includes the following steps: Step 1: Set the experimental environmental conditions; Step 2: Set the position of the temperature sensor; Step 3: Based on the limiting conditions of Step 1 and Step 2, conduct a continuous ramp starting ability test for a passenger car with a time interval of no more than 40 s for each start, and the vehicle completes 20 ramp starts; The continuous ramp starting ability test for the passenger car in Step 3 includes the following steps: Step 3.1: Conduct a warm-up drive for the vehicle to make the engine oil temperature and the transmission lubricating oil temperature reach above 90 °C and the temperature be in a balanced state; Step 3.2: Use the service brake to stop the vehicle at a position 10 m away from the top of the slope on the test section of the test ramp; Step 3.3: If the slope at which the vehicle can successfully start is 30%, conduct the test normally. If the maximum slope at which the vehicle can successfully start is less than 30%, the test should be conducted on the ramp corresponding to the maximum slope at which the vehicle can successfully start; Step 3.4: Release the brake pedal and immediately step on the accelerator pedal to climb the slope, so that the vehicle completely climbs to the top of the slope, and record the maximum vehicle speed that the vehicle can reach on the test section; Step 3.5: During the starting process, the atmospheric pressure, time, distance, height, vehicle speed, engine speed and various temperature parameters should be recorded simultaneously. For abnormal phenomena occurring during the starting process, detailed records need to be made; Step 3.6: If the test vehicle fails to start climbing within 5 s after stepping on the accelerator pedal, it is considered that the starting ability fails; if the maximum vehicle speed on the test section cannot reach 60% of the maximum vehicle speed during the first slope start, it is considered that the starting ability declines; Step 3.7: Repeat Steps 3.3 to 3.6 with a time interval of no more than 40 s for each start until the vehicle completes 20 ramp starts; Step 3.8: If the starting ability fails or the starting ability declines before the vehicle completes 20 ramp starts, stop the test and record the number of ramp starts that have been completed; Step 3.9: During the test process, if the engine coolant shows the phenomenon of "boiling over" or the engine oil temperature and the transmission lubricating oil temperature exceed the limit values, the test should also be stopped and the number of ramp starts that have been completed should be recorded; The continuous ramp starting ability test for the passenger car in Step 3 also includes: If the test vehicle has a ramp assist function, the relevant function should be turned on; Use the automatic shift mode, and conduct tests for both the forward gear and the reverse gear. For four-wheel drive vehicles, use all-wheel drive; If there is no corresponding test slope, compensate by modifying the mass ΔM, and calculate the modified mass according to the following formula: In the formula: ΔM is the modified mass; M is the maximum design gross mass; a0 is the actual slope angle of the ramp used; a1 is the specified slope angle of the test ramp; R is the rolling resistance coefficient, taking 0.01; when the calculated modified mass ΔM is positive, load should be added, and when it is negative, load should be reduced.

2. The test method for the continuous ramp starting ability of a passenger car according to claim 1, wherein The specific content of Step 1 includes the following limiting conditions: For a ramp with a slope of 30%, the length of the test section of the ramp is not less than 20 m, and there are transition sections at the front and rear of the test section. The road surface should be a paved road surface that is flat, solid, dry and has a uniform slope; There should be no fog, rain or hail during the test, the average wind speed should not be greater than 3 m / s, the gust wind should not be greater than 5 m / s, and the ambient temperature should not be lower than 25 °C; The test mass is the maximum designed total mass; The error of the cold inflation pressure of the tire does not exceed 10 kPa.

3. The test method for the continuous ramp starting ability of a passenger car according to claim 2, wherein The measurement parameters and their accuracies in the test are specifically as follows: the time error is not greater than ±0.1 s, the length error of the ramp of the test section is not greater than ±0.1 m, the temperature error is not greater than ±0.1 °C, the atmospheric pressure error is not greater than ±1 kPa, the speed error is not greater than ±0.1 km / h, the error is not greater than ±5 kg when the mass ≤ 3500 kg and the error is not greater than ± 10 kg.

4. The test method for the continuous ramp starting ability of a passenger car according to claim 1, wherein The limiting conditions for the position of the temperature sensor in step 2 are specifically as follows. Installed at a height of 1.5 m on the vehicle, away from heat sources, ventilated and without direct sunlight, for measuring the ambient temperature; Installed at the center of the engine outlet rubber hose, for measuring the engine outlet water temperature; Installed at the center of the engine radiator outlet rubber hose, for measuring the engine inlet water temperature; Installed inside the transmission oil pan, for measuring the transmission lubricating oil temperature; Installed inside the drive axle oil pan, for measuring the drive axle lubricating oil temperature.

5. The test method for the continuous ramp starting ability of a passenger car according to claim 4, wherein The limiting conditions for the position of the temperature sensor also include being installed at the center of the connection cavity of the oil pressure sensing plug, for measuring the main oil gallery engine oil temperature; Installed at the oil drain bolt of the oil pan, for measuring the oil pan engine oil temperature; Take the higher of the main oil gallery engine oil temperature and the oil pan engine oil temperature as the engine oil temperature; When a passenger vehicle has a separate transfer case, a temperature sensor should be installed in the transfer case, and take the higher of the transmission lubricating oil temperature and the transfer case lubricating oil temperature as the transmission lubricating oil temperature.

6. An evaluation method for the continuous ramp starting ability of a passenger car, characterized in that, The evaluation method is based on the continuous ramp start ability test method of a passenger vehicle according to any one of claims 1-5 above; If the vehicle can complete 20 ramp starts and there is no failure or decline in the start ability, it is considered that the vehicle has excellent continuous ramp start ability; If the vehicle can complete 15 ramp starts and there is no failure or decline in the start ability, but there is a failure or decline in the start ability before completing 20 ramp starts, it is considered that the vehicle has qualified continuous ramp start ability and can basically meet the user's usage requirements; If there is a failure or decline in the start ability of the vehicle before completing 15 ramp starts, it is considered that the vehicle's continuous multiple ramp start ability is unqualified.

7. The evaluation method for the continuous ramp starting ability of a passenger car according to claim 6, characterized in that, If the vehicle can complete at most 15 ramp starts or there is a failure or decline in the start ability before completing 15 ramp starts, the vehicle manufacturer should adjust the vehicle so that it can at least complete 15 ramp starts and there is no failure or decline in the start ability.

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