CN115839844A - Ramp durability test method for double-clutch automatic transmission based on whole vehicle - Google Patents
Ramp durability test method for double-clutch automatic transmission based on whole vehicle Download PDFInfo
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- CN115839844A CN115839844A CN202211440001.9A CN202211440001A CN115839844A CN 115839844 A CN115839844 A CN 115839844A CN 202211440001 A CN202211440001 A CN 202211440001A CN 115839844 A CN115839844 A CN 115839844A
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Abstract
The invention relates to a ramp durability test method of a double-clutch automatic transmission based on a whole vehicle. The method comprises the following steps: accurate vehicle; the climbing test of the whole vehicle is carried out, and the method specifically comprises the following steps: the vehicle is positioned on a slope, the brake is stepped on, and the brake is released to confirm that the brake is normal; d gear is engaged, the throttle opening is controlled to supply oil, so that an electronic hand brake or a ramp auxiliary system is automatically released, the starting rotating speed does not exceed a first preset rotating speed threshold value, the throttle is stabilized until the throttle climbs to the top of a slope, and the throttle returns from other ramps; repeating the operation, finishing n times of climbing within a first preset time to be a cycle, finishing the cycle, engaging the D gear, driving on a flat road for a second preset time at a first preset speed, and then performing the next cycle, wherein the electronic hand brake and the ramp auxiliary system are alternately replaced for seven times per cycle until the cycle is finished; the durability of the dual clutch automatic transmission is determined based on the wear condition of the clutch. The method can accurately evaluate the reliability and durability of the double-clutch automatic transmission of the whole vehicle under the working conditions of hill starting and driving.
Description
Technical Field
The invention relates to the technical field of automobile power transmission, in particular to a ramp durability test method of a double-clutch automatic transmission based on a whole automobile.
Background
In a dual clutch automatic transmission, a relatively important part is a dual clutch, which is generally classified into a dry type dual clutch and a wet type dual clutch, and the dual clutch is not only used for shifting, but also used as a starting element. Among them, the wet clutch can be used for a vehicle having a large torque because a lubricating and cooling oil passage for the clutch is designed, which allows a higher energy input, as compared with the dry clutch. The half clutch is frequently used when the vehicle starts to ensure that the power output of the engine is soft, and the requirement of a user on the starting comfort of the vehicle is met. However, with the current situation of increasingly severe road traffic jam, the double clutch half-combination starting is frequently used in the working conditions of ramps, traffic jams and the like within a short time, so that the working temperature of the clutch is rapidly increased, and even the faults that the clutch slips and the vehicle cannot run occur in severe cases.
In the existing clutch bench test method, only the reliability and durability of a clutch monomer are checked, interaction with other systems is avoided, and a rapid verification test method for the reliability and durability of a double-clutch ramp is not available on a whole vehicle. Therefore, it is highly desirable to design a method for testing the reliability and durability of a dual clutch automatic transmission for a finished vehicle to accurately judge the reliability and durability of the dual clutch automatic transmission under a slope condition.
Disclosure of Invention
The invention aims to provide a ramp endurance test method of a double-clutch automatic transmission based on a whole vehicle, which is used for accurately evaluating the reliability and endurance performance of the double-clutch automatic transmission of the whole vehicle under the conditions of ramp starting and running.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a ramp endurance test method of a double-clutch automatic transmission based on a finished automobile comprises the following steps:
s1, accurate vehicle;
s2, carrying out a climbing test of the whole vehicle, which specifically comprises the following steps:
s21, enabling front wheels and rear wheels of the vehicle to be located on a slope with the slope being a first preset slope threshold value, stepping on a brake to keep the vehicle static, and releasing the brake to confirm that the EPB brake is normal;
s22, engaging a D gear, supplying oil according to a first preset accelerator opening degree, automatically releasing an electronic hand brake EPB or a ramp auxiliary system HHC, stabilizing an accelerator until the accelerator climbs to the top of a slope and returning from the ramp with the slope as a second preset slope threshold value, wherein the starting rotating speed does not exceed the first preset rotating speed threshold value;
s23, repeating S21 and S22, finishing n times of climbing in a first preset time to form one cycle, finishing the one cycle, engaging the D gear, driving on a flat road for a second preset time at a first preset speed, and then performing the next cycle, wherein the electronic hand brake EPB and the ramp auxiliary system HHC are alternately replaced for seven times in each cycle until the cycle number is m;
and S24, determining the reliability and durability of the dual-clutch automatic transmission under the hill starting and driving conditions according to the wear condition of the clutch assembly.
Preferably, in S1, the specific steps of accurately performing vehicle operation are:
s11, confirming that the ambient temperature is above 25 ℃, checking the vehicle state, fully opening the vehicle headlamp and the air conditioner load, fully balancing the vehicle according to the servicing quality and the front and rear wheel load requirements declared by vehicle regulations, confirming that the tire pressure is normal, and testing the computer and the vehicle
The vehicle body controller of the vehicle is connected to obtain a vehicle speed signal and an accelerator opening signal of the vehicle;
s12, confirming that the vehicle electronic hand brake EPB and the ramp auxiliary function HHC can be automatically released, and confirming that the recorded ECU and TCU data are normal.
Preferably, in S21, the ramp is a dry asphalt or concrete pavement, and the length of the ramp is at least 15m.
Preferably, in S2, the first preset gradient threshold is any gradient within a range of 17 to 23%, the second preset gradient threshold is 30%, and the first preset accelerator opening is any accelerator opening within a range of 20 to 29% accelerator opening.
Preferably, in S22, the first preset rotation speed threshold is 2500rpm; if the starting rotating speed exceeds a first preset rotating speed threshold value, engaging an N gear or an R gear to retreat down a ramp, and enabling front and rear wheels of the vehicle to be on the ramp with the gradient being the first preset gradient threshold value again; if the accelerator is stepped on and the vehicle stops or moves backwards, idling is carried out for 10 minutes or more at a first preset rotating speed threshold value, and then a climbing test is carried out.
Preferably, in S23, the first preset time is 130 seconds, and n is 3; the first preset vehicle speed is 20Km/h, and the second preset time is 1 minute.
Preferably, in S23, m is more than or equal to 80.
Preferably, in S24, the specific steps are: disassembling the clutch, checking each part of the clutch, and judging that the reliability and the durability of the clutch are qualified if the damage level of each part is 2 or below;
wherein the damage level of the part is as follows: level 1 indicates that the part surface has no color change; level 2 indicates that the color change rate of the surface of the part is less than 20 percent and the function is normal; grade 3 shows that the color change rate of the surface of the part is between 20 and 50 percent, and the function is normal; level 4 indicates that the color change rate of the surface of the part is between 50 and 80 percent, and the function is normal; grade 5 indicates that the discoloration rate of the surface of the part is 80% or more and the function is abnormal.
The invention has the beneficial effects that:
the invention relates to a ramp endurance test method of a double-clutch automatic transmission based on a whole vehicle, which is characterized in that a ramp starting test and a circulating climbing test of the vehicle on an actual ramp are utilized to simulate the running condition of the vehicle on the actual ramp, so that the durability and the reliability of the double-clutch automatic transmission of the vehicle under a ramp starting working condition and a climbing working condition are evaluated, and the interaction of a transmission TCU, a ramp auxiliary system HHC and an electronic parking system is combined, so that the durability and the reliability of the double-clutch automatic transmission of the vehicle in ramp starting and running when a user uses the vehicle are objectively and truly evaluated, the blank of the double-clutch automatic transmission in the aspect of the ramp durability and the reliability test is filled up, and the method can be suitable for a wet type double-clutch automatic transmission and a double-clutch automatic transmission, has the advantages of simple operation, easy realization and high accuracy, and has popularization and application values in the technical field of automobile power transmission.
Drawings
FIG. 1 is a flow chart of a ramp endurance test method of a dual-clutch automatic transmission based on a whole vehicle.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure herein, wherein the embodiments of the present invention are described in detail with reference to the accompanying drawings and preferred embodiments. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be understood that the preferred embodiments are illustrative of the invention only and are not limiting upon the scope of the invention.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Examples
As shown in FIG. 1, the ramp endurance test method for the double-clutch automatic transmission based on the whole vehicle comprises the following steps:
s1, accurate vehicle; the method comprises the following specific steps:
s11, confirming that the ambient temperature is above 25 ℃, checking the state of the vehicle, fully opening the vehicle headlamp and the air conditioner load (in the embodiment, the air conditioner opening mode is internal circulation and refrigeration), carrying out full-load counterweight on the vehicle according to the conditioning quality and the load requirements of front and rear wheels, which are declared by vehicle regulations (in the embodiment, 75Kg counterweight of each person, 25Kg counterweight of a trunk and 400Kg of total counterweight are carried out), and confirming that the tire pressure is normal;
s12, confirming that the electronic hand brake EPB and the ramp auxiliary function HHC of the vehicle can be automatically released, and confirming that the recorded ECU and TCU data are normal;
s2, carrying out a climbing test of the whole vehicle, which specifically comprises the following steps:
s21, enabling front wheels and rear wheels of the vehicle to be located on a slope with the gradient of 20%, stepping on a brake to keep the vehicle static, and releasing the brake to confirm that the EPB brake of the electronic hand brake is normal (does not slide down the slope);
wherein the ramp is a dry asphalt or concrete pavement, and the length of the ramp is at least 15m;
s22, a D gear is engaged by a gear shifting handle, when an instrument displays D, the accelerator is quickly stepped on and oil is supplied by about 25 percent of accelerator opening, so that an electronic hand brake EPB or a ramp auxiliary system HHC is automatically released, the accelerator is controlled not to slip a vehicle driving wheel, the starting rotating speed does not exceed 2500rpm, the accelerator is stabilized until the accelerator climbs to the top of a slope with the slope of 20 percent, and then the accelerator returns from the slope with the slope of 30 percent or other slopes (specifically determined according to the slope condition of a test field);
if the starting rotating speed exceeds 2500rpm, engaging an N gear or an R gear to retreat a ramp, and enabling front and rear wheels of the vehicle to be on the ramp with the gradient of 20 percent; if the accelerator is stepped on and the vehicle stops or moves backwards, the vehicle is idled for 10 minutes or more at the rotating speed of 2500rpm, and then a climbing test is carried out;
s23, repeating S21 and S22, finishing 3 times of climbing in 130 seconds to form a cycle, wherein the gear shifting on the slope cannot be realized in each cycle, finishing the cycle, engaging the D gear, driving for 1 minute on a flat road at the speed of 20Km/h, cooling, and performing the next cycle, wherein the electronic hand brake EPB and the slope auxiliary system HHC are alternately replaced for seven times in each cycle until the cycle number is 85 times;
the electronic hand brake EPB and the ramp auxiliary system HHC are alternately replaced for seven times in each cycle, the electronic hand brake EPB is adopted for parking in the first cycle, the ramp auxiliary system HHC is adopted for parking in the second cycle, the electronic hand brake EPB is adopted for parking in the third cycle, the ramp auxiliary system HHC is adopted for parking in the fourth cycle, and the rest can be done in the same way;
s24, determining the reliability and the durability of the dual-clutch automatic transmission under the hill starting and running conditions according to the abrasion condition of the clutch assembly; the method specifically comprises the following steps:
disassembling the clutch, checking each part of the clutch, and judging that the reliability and the durability of the clutch are qualified if the damage level of each part is 2 or below;
wherein the damage level of the part is: level 1 indicates that the part surface has no color change; level 2 indicates that the color change rate of the surface of the part is less than 20 percent (excluding end points), and the function is normal; grade 3 shows that the color change rate of the surface of the part is between 20 and 50 percent (inclusive), and the function is normal; grade 4 shows that the color change rate of the surface of the part is 50 to 80 percent (excluding end points), and the function is normal; grade 5 indicates that the discoloration rate of the surface of the part is 80% or more and the function is abnormal.
In conclusion, the hill endurance test method for the double-clutch automatic transmission based on the whole vehicle provided by the invention has the advantages that hill starting and circular climbing tests of the vehicle on an actual hill are utilized to simulate the driving condition of the vehicle on the actual hill, so that the durability and the reliability of the double-clutch automatic transmission of the vehicle under the hill starting working condition and the climbing working condition are evaluated, and the interaction of the transmission TCU, the hill auxiliary system HHC and the electronic parking system is combined, so that the durability and the reliability of the double-clutch automatic transmission of the vehicle under the hill starting working condition and the climbing working condition are objectively and really evaluated, the blank of the double-clutch automatic transmission in the aspect of testing the durability and the reliability of the hill when a user uses the vehicle is made up, the method is suitable for wet type and dry type double-clutch automatic transmissions, has the advantages of simplicity in operation, easiness in implementation and high accuracy, and has popularization and application values in the technical field of automobile power transmission.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention.
Claims (8)
1. A ramp endurance test method of a double-clutch automatic transmission based on a finished automobile is characterized by comprising the following steps of:
s1, accurate vehicle driving;
s2, carrying out a climbing test of the whole vehicle, which specifically comprises the following steps:
s21, enabling front wheels and rear wheels of the vehicle to be located on a slope with the slope being a first preset slope threshold value, stepping on a brake to keep the vehicle static, and releasing the brake to confirm that the EPB brake of the electronic hand brake is normal;
s22, engaging a D gear, supplying oil according to a first preset accelerator opening degree, automatically releasing an electronic hand brake EPB or a ramp auxiliary system HHC, stabilizing an accelerator until the accelerator climbs to the top of a slope and returning from the ramp with the slope as a second preset slope threshold value, wherein the starting rotating speed does not exceed the first preset rotating speed threshold value;
s23, repeating S21 and S22, finishing n times of climbing in a first preset time to form one cycle, finishing the one cycle, engaging the D gear, driving on a flat road for a second preset time at a first preset speed, and then performing the next cycle, wherein the electronic hand brake EPB and the ramp auxiliary system HHC are alternately replaced for seven times in each cycle until the cycle number is m;
and S24, determining the reliability and the durability of the dual-clutch automatic transmission under the hill starting and driving conditions according to the wear condition of the clutch assembly.
2. The ramp durability test method for the double-clutch automatic transmission based on the whole vehicle as claimed in claim 1, wherein in the step S1, the concrete steps of accurate vehicle are as follows:
s11, confirming that the ambient temperature is above 25 ℃, checking the state of the vehicle, fully opening the load of a vehicle headlamp and an air conditioner, fully balancing the vehicle according to the quality of the vehicle and the load requirements of front and rear wheels, which are declared by vehicle regulations, and confirming that the air pressure of a tire is normal;
s12, confirming that the vehicle electronic hand brake EPB and the ramp auxiliary function HHC can be automatically released, and confirming that the data of the ECU and the TCU are recorded normally.
3. The vehicle-based dual-clutch automatic transmission ramp endurance testing method according to claim 1, wherein in S21, the ramp is a dry asphalt or concrete pavement, and the length of the ramp is at least 15m.
4. The vehicle-based dual-clutch automatic transmission ramp endurance test method according to claim 1, wherein in S2, the first preset gradient threshold is any gradient within a range of 17 to 23%, the second preset gradient threshold is 30%, and the first preset accelerator opening is any accelerator opening within a range of 20 to 29%.
5. The hill endurance test method for dual clutch automatic transmission according to claim 1, wherein in S22, the first preset rotation speed threshold is 2500rpm; if the starting rotating speed exceeds a first preset rotating speed threshold value, engaging an N gear or an R gear to retreat down a ramp, and enabling front and rear wheels of the vehicle to be on the ramp with the gradient being the first preset gradient threshold value again; if the accelerator is stepped on and the vehicle stops or moves backwards, idling is carried out for 10 minutes or more at a first preset rotating speed threshold value, and then a climbing test is carried out.
6. The vehicle-based dual-clutch automatic transmission ramp endurance testing method according to claim 1, wherein in S23, the first preset time is 130 seconds, and n is 3; the first preset vehicle speed is 20Km/h, and the second preset time is 1 minute.
7. The ramp durability test method for the double-clutch automatic transmission based on the whole vehicle according to the claim 1, characterized in that in S23, m is more than or equal to 80.
8. The ramp durability test method for the double-clutch automatic transmission based on the whole vehicle as claimed in claim 1, wherein in S24, the specific steps are as follows: disassembling the clutch, checking each part of the clutch, and judging that the reliability and the durability of the clutch are qualified if the damage level of each part is 2 or below;
wherein the damage level of the part is: level 1 indicates that the surface of the part has no color change; level 2 indicates that the color change rate of the surface of the part is less than 20 percent and the function is normal; grade 3 shows that the color change rate of the surface of the part is between 20 and 50 percent, and the function is normal; level 4 indicates that the color change rate of the surface of the part is between 50 and 80 percent, and the function is normal; grade 5 indicates that the discoloration rate of the surface of the part is 80% or more and the function is abnormal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211440001.9A CN115839844A (en) | 2022-11-17 | 2022-11-17 | Ramp durability test method for double-clutch automatic transmission based on whole vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211440001.9A CN115839844A (en) | 2022-11-17 | 2022-11-17 | Ramp durability test method for double-clutch automatic transmission based on whole vehicle |
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| CN202211440001.9A Pending CN115839844A (en) | 2022-11-17 | 2022-11-17 | Ramp durability test method for double-clutch automatic transmission based on whole vehicle |
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- 2022-11-17 CN CN202211440001.9A patent/CN115839844A/en active Pending
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