CN114485536A - Method and system for testing surface flatness of friction plate of double-clutch transmission - Google Patents
Method and system for testing surface flatness of friction plate of double-clutch transmission Download PDFInfo
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- CN114485536A CN114485536A CN202210100304.XA CN202210100304A CN114485536A CN 114485536 A CN114485536 A CN 114485536A CN 202210100304 A CN202210100304 A CN 202210100304A CN 114485536 A CN114485536 A CN 114485536A
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Abstract
The embodiment of the invention discloses a method and a system for testing the surface flatness of a friction plate of a double-clutch transmission. The method comprises the steps of collecting actual output rotating speed of each gear of the transmission at a set driving rotating speed by using an output end motor, determining theoretical output rotating speed of each gear at the set driving rotating speed according to the transmission ratio of a transmission assembly at each gear, determining actual rotating speed deviation of the actual output rotating speed and the theoretical output rotating speed at each gear, comparing the actual rotating speed deviation with a reference threshold value deviation obtained according to a single clutch friction plate flatness test, determining the qualified condition of the surface flatness of the clutch at each gear, and finally, integrating the qualified condition of the surface flatness of the clutch at each gear to judge whether the surface flatness of the clutch of the transmission is qualified. The technical scheme of this embodiment can detect out the unqualified sample of friction disc surface roughness, avoids the out-of-tolerance product to flow into market, further improves the yields of derailleur product.
Description
Technical Field
The embodiment of the invention relates to the technical field of clutch friction plate detection, in particular to a method and a system for testing the surface flatness of a friction plate of a double-clutch transmission.
Background
The clutch is an important part for ensuring the functions of stable starting, smooth gear shifting, light and convenient operation and the like of the automobile. For a friction clutch, the performance of a friction plate directly affects the service life of the clutch, the stability of an automobile transmission system and the safety of vehicle use, and the research on the performance of the friction plate of the clutch is increasingly concerned at home and abroad, and the research is particularly concerned in the aspect of the smoothness of the friction plate.
In the existing wet type double clutch type automatic transmission scheme, a transmission route from an engine to a transmission torque and power is carried out by controlling the connection of a plurality of wet type clutches, and the surface flatness of friction plates in the wet type clutches is poor due to inconsistent quality control in the production, manufacturing or assembling process, so that the linearity of the torque transmitted by the corresponding clutches is poor, the torque transmission curve represented on the whole vehicle level is poor, the surface flatness of the friction plates exceeds the normal index, and therefore ultra-poor products flow into the market, and users complain about the ultra-poor products.
Disclosure of Invention
The embodiment of the invention provides a method and a system for testing the surface flatness of a friction plate of a double-clutch transmission, so that a sample with unqualified surface flatness of the friction plate is detected, an out-of-tolerance product is prevented from flowing into the market, and the yield of the transmission product is further improved.
In a first aspect, an embodiment of the present invention provides a method for testing surface flatness of a friction plate of a dual clutch transmission, where the method is applied to an off-line test bench, and the method includes:
acquiring the actual output rotating speed of each gear of the transmission at the set driving rotating speed by using an output end motor;
determining the theoretical output rotating speed of each gear under the set driving rotating speed according to the transmission ratio of the transmission assembly under each gear;
determining actual rotating speed deviation of the actual output rotating speed and the theoretical output rotating speed under each gear;
comparing the actual rotating speed deviation with a reference threshold value deviation obtained according to a single clutch friction plate flatness test, and determining the qualified condition of the surface flatness of the clutch under each gear;
and (4) integrating the qualified conditions of the surface flatness of the clutch under each gear, and judging whether the surface flatness of the clutch of the transmission is qualified or not.
Optionally, before acquiring the actual output rotation speed of each gear of the transmission at the set driving rotation speed by using the output end motor, the method further includes:
and driving the speed changer by using the input end motor according to the set driving rotating speed.
Optionally, the acquiring, by the output end motor, an actual output rotation speed of each gear of the transmission at the set driving rotation speed includes:
and in the process of sequentially upshifting or sequentially downshifting, the actual output rotating speed of each gear of the transmission under the set driving rotating speed is acquired by using an output end motor.
Optionally, before the step of acquiring the actual output rotation speed of each gear of the transmission at the set driving rotation speed by using the output end motor, the method further includes:
controlling a clutch to which the current gear belongs to be in a fully engaged state;
and controlling the clutch belonging to the non-current gear to be in a completely separated state.
Optionally, comparing the actual rotation speed deviation with a reference threshold deviation obtained according to a single clutch friction plate flatness test, and determining that the clutch surface flatness is qualified under each gear, includes:
when the actual rotating speed deviation is larger than the reference threshold value deviation obtained according to the flatness test of the single clutch friction plate, judging that the surface flatness of the clutch under the current gear is unqualified;
and when the actual rotating speed deviation is less than or equal to the reference threshold value deviation obtained according to the single clutch friction plate flatness test, judging that the clutch surface flatness under the current gear is qualified.
Optionally, synthesizing the qualified condition of the clutch surface flatness under each gear, and determining whether the clutch surface flatness of the transmission is qualified includes:
and when the surface evenness of the clutch is unqualified under any gear, judging that the surface evenness of the clutch of the transmission is unqualified.
Optionally, the range of the set driving speed is 1500-3000 rpm.
In a second aspect, an embodiment of the present invention further provides a system for testing the surface flatness of a friction plate of a dual clutch transmission, where several barrels of test are integrated in an offline test bench, and the system includes:
the output end motor is used for acquiring the actual output rotating speed of each gear of the transmission at the set driving rotating speed;
the deviation calculation module is used for determining the theoretical output rotating speed of each gear under the set driving rotating speed according to the transmission ratio of the transmission assembly under each gear, and determining the actual rotating speed deviation between the actual output rotating speed and the theoretical output rotating speed under each gear;
the flatness judging module is used for comparing the actual rotating speed deviation with a reference threshold value deviation obtained according to a single clutch friction plate flatness test and determining the qualified condition of the surface flatness of the clutch under each gear; and the qualified condition of the surface evenness of the clutch under each gear is integrated, and whether the surface evenness of the clutch of the transmission is qualified or not is judged.
Optionally, the drive system further comprises an input motor for driving the transmission at the set drive speed.
Optionally, the clutch control module is further configured to control the clutch to which the current gear belongs to be in a fully engaged state, and further control the clutch to which the non-current gear belongs to be in a fully disengaged state.
The embodiment of the invention provides a method and a system for testing the surface flatness of a friction plate of a double-clutch transmission, in the scheme of the embodiment of the invention, the testing method is applied to an off-line testing bench, and the testing method comprises the following steps: the actual output rotating speed of each gear of the transmission under the set driving rotating speed is acquired by utilizing the output end motor, and then, determining the theoretical output rotating speed of each gear under the set driving rotating speed according to the transmission ratio of the transmission assembly under each gear, secondly, determining the actual rotating speed deviation of the actual output rotating speed and the theoretical output rotating speed under each gear, then comparing the actual rotating speed deviation with a reference threshold value deviation obtained according to the flatness test of a single clutch friction plate, determining the qualified condition of the surface flatness of the clutch under each gear, finally, the qualified situation of the surface evenness of the clutch under each gear is integrated, whether the surface evenness of the clutch of the transmission is qualified or not is judged, the qualified condition of the surface evenness of the clutch under each gear is determined, so that unqualified samples of the surface evenness of the friction plate are detected, the products with out-of-tolerance are prevented from flowing into the market, and the yield of transmission products is further improved.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 is a schematic flow chart of a method for testing the surface flatness of a friction plate of a dual clutch transmission according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a system for testing the surface flatness of a friction plate of a dual clutch transmission according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like. In addition, the embodiments and features of the embodiments in the present invention may be combined with each other without conflict.
The term "include" and variations thereof as used herein are intended to be open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment".
It should be noted that the concepts of "first", "second", etc. mentioned in the present invention are only used for distinguishing corresponding contents, and are not used for limiting the order or interdependence relationship.
It is noted that references to "a", "an", and "the" modifications in the present invention are intended to be illustrative rather than limiting, and that those skilled in the art will recognize that reference to "one or more" unless the context clearly dictates otherwise.
Fig. 1 is a schematic flow chart of a method for testing the surface flatness of a friction plate of a dual clutch transmission according to an embodiment of the present invention. The testing method is applied to a offline testing bench, and as shown in fig. 1, the testing method specifically comprises the following steps:
and S110, acquiring the actual output rotating speed of each gear of the transmission at the set driving rotating speed by using an output end motor.
The dual-clutch transmission is based on the basic principle of a manual transmission, two sets of clutches are adopted, according to a driving rotating speed value input by an input end motor connected with the transmission, gears are automatically adjusted through a gear shifting control circuit and a mechanical electronic module, power transmission is achieved, the two sets of clutches are mutually and alternately operated and are respectively connected with an engine through the clutches 1 and 2, an input inner shaft and an outer shaft are respectively meshed with an odd gear or an even gear, the gear which is specifically and firmly connected with an output shaft is determined through a gear shifting structure with a dog tooth gear, the gear is prepared in advance before the next gear is changed, once a traveling computer sends a gear shifting instruction, the gear can directly transmit power, and the continuity of gear shifting switching is guaranteed. Illustratively, two clutches, one controls odd 1, 3, 5 gears, and the other controls even 2, 4, 6 gears, when using 1 gear, 2 gears are ready to be switched at any time to achieve the effect of zero-clearance gear shifting, only the switching of the clutch is needed during gear shifting, the gear shifting time is greatly shortened, and the dual-clutch transmission has the characteristics of high transmission efficiency and strong reliability.
Specifically, two clutches are operated independently during the use of the double clutches, gears are pre-judged according to information such as the rotating speed of an engine, the vehicle speed and the opening degree of a throttle valve, for example, when the 2-gear is accelerated, the 3-gear is already in a preparation state, the process of switching from the 2-gear to the 3-gear is only the process of separating an even-gear clutch and engaging an odd-gear clutch, the double-clutch transmission can exit from one gear and gradually enter into the other gear, and the actual output rotating speed of the transmission in the set driving rotating speed at the gear is acquired by an output end motor.
And S120, determining the theoretical output rotating speed of each gear under the set driving rotating speed according to the transmission ratio of the transmission assembly under each gear.
The transmission ratio of the transmission assembly under each gear is the ratio of the rotating speeds of the front and the rear transmission mechanisms of the transmission in the automobile transmission system, and is also called as a speed ratio.
Specifically, in the present embodiment, the theoretical output rotation speed of each gear is represented by n. When the transmission is in use, a stable rotating speed input value for driving is provided through an input end motor, and the theoretical output rotating speed n of each gear is equal to the stable rotating speed input value for driving/the transmission ratio of the transmission assembly under each gear.
And S130, determining the actual rotating speed deviation between the actual output rotating speed and the theoretical output rotating speed in each gear.
In the present embodiment, the actual rotational speed deviation value is denoted by P. On the basis of the above steps, the actual output rotation speed of each gear of the transmission collected by the output end motor at the set driving rotation speed and the theoretical output rotation speed n of each gear are obtained according to the ratio of the stable rotation speed input value for driving provided by the input end motor to the transmission ratio of the transmission assembly at each gear, and the actual rotation speed deviation P, namely the actual output rotation speed at each gear-the theoretical output rotation speed n at each gear, can be calculated.
S140, comparing the actual rotating speed deviation with a reference threshold value deviation obtained according to the flatness test of the single clutch friction plate, and determining the qualified condition of the surface flatness of the clutch under each gear.
In the present embodiment, the obtained reference threshold deviation is denoted by Pi. Before the dual-clutch transmission is formally used, a single clutch flatness test is carried out on the transmission of the type to obtain an empirical value of the clutch friction plate flatness corresponding to each gear in the transmission, and the empirical value is used as a reference value of the clutch friction plate surface flatness in the subsequent actual detection process. It should be noted that, the reference threshold deviation Pi of the flatness of the clutch friction plate corresponding to each gear is obtained by a specific person in the early stage test process, and in the embodiment, when the clutch surface flatness passing condition under each gear is determined, the reference threshold deviation Pi is used as a specific empirical value for test and comparison.
Optionally, comparing the actual rotation speed deviation with a reference threshold deviation obtained according to a single clutch friction plate flatness test, and determining the qualified condition of the clutch surface flatness under each gear, including: and when the actual rotating speed deviation is less than or equal to the benchmark threshold deviation obtained according to the single-item clutch friction plate flatness test, judging that the clutch surface flatness under the current gear is qualified.
On the basis of the embodiment, the qualified condition of the surface flatness of the clutch in each gear can be further determined by comparing the actual rotating speed deviation P in each gear with the reference threshold value deviation Pi of the flatness of the friction plate of the clutch corresponding to each gear.
For example, when the clutch gear is in the 1 gear, the calculated actual rotation speed deviation P is greater than the reference threshold deviation Pi of the flatness of the corresponding clutch friction plate in the 1 gear, and it is determined that the clutch surface flatness in the 1 gear is not qualified, which indicates that the surface flatness of the clutch friction plate in the gear is too poor.
When the gear of the clutch is in the 1 gear, the calculated actual rotating speed deviation P is smaller than or equal to the reference threshold value deviation Pi of the flatness of the corresponding clutch friction plate in the 1 gear, the flatness of the surface of the clutch in the 1 gear is judged to be qualified, and when the gear is switched from the 1 gear to the 2 gear, the effect of zero clearance gear shifting can be achieved.
S150, integrating the qualified conditions of the surface flatness of the clutch under each gear, and judging whether the surface flatness of the clutch of the transmission is qualified.
Through the specific implementation mode of the steps, whether the surface flatness of the clutch under each gear is qualified can be determined, and whether the surface flatness of the clutch friction plates of all gears of the transmission is qualified can be judged through comprehensively recording the qualified condition of the surface flatness of the clutch under each gear.
Optionally, synthesizing the qualified condition of the clutch surface flatness under each gear, and determining whether the clutch surface flatness of the transmission is qualified includes: and when the surface evenness of the clutch is unqualified under any gear, judging that the surface evenness of the clutch of the transmission is unqualified.
It can be understood that whether the flatness of the surface of the clutch at a certain gear is qualified or not is determined according to the comparison between the actual rotating speed deviation P at the certain gear and the reference threshold deviation Pi of the flatness of the clutch friction plate corresponding to the gear, if the calculated actual rotating speed deviation P is greater than the reference threshold deviation Pi of the flatness of the clutch friction plate corresponding to the gear 1, the flatness of the surface of the clutch at the gear is determined to be unqualified, which indicates that the flatness of the surface of the clutch friction plate at the gear is out of tolerance, in all gears, the surface flatness of the clutch friction plate at the gear is already unqualified, and in order to avoid that the instability of the whole transmission is influenced by the corresponding torque fluctuation generated by the motor at the output end after the clutch is engaged at the gear, the flatness of the surface of the clutch of the whole transmission is directly determined to be unqualified, therefore, the over-tolerance products are prevented from flowing into the market, and the yield of the transmission products is improved.
Through the specific implementation mode of the steps, the actual rotating speed deviation P under each gear is calculated to be smaller than or larger than the reference threshold value deviation Pi of the flatness of the corresponding clutch friction plate under the gear to be shifted, the flatness of the surface of the clutch under each gear is judged to be qualified, and the flatness of the surface of the clutch of the transmission is judged to be qualified by integrating the qualified conditions of the flatness of the surface of the clutch under all gears.
The method for testing the surface flatness of the friction plate of the double-clutch transmission is applied to an off-line test bench and comprises the following steps: the method comprises the steps of collecting actual output rotating speed of each gear of a transmission at a set driving rotating speed by using an output end motor, determining theoretical output rotating speed of each gear at the set driving rotating speed according to the transmission ratio of a transmission assembly at each gear, determining actual rotating speed deviation between the actual output rotating speed and the theoretical output rotating speed at each gear, comparing the actual rotating speed deviation at each gear with a reference threshold deviation obtained according to a single-item clutch friction plate flatness test at the gear, judging that the flatness of the surface of the clutch at the current gear is unqualified when the actual rotating speed deviation is greater than the reference threshold deviation obtained according to the single-item clutch friction plate flatness test, and judging that the flatness of the surface of the clutch at the current gear is qualified when the actual rotating speed deviation is less than or equal to the reference threshold deviation obtained according to the single-item clutch friction plate flatness test, the qualified situation of the surface evenness of the clutch under each gear is determined, the unqualified sample of the surface evenness of the friction plate is detected, the ultra-poor product is prevented from flowing into the market, finally, the qualified situation of the surface evenness of the clutch under each gear is integrated, whether the surface evenness of the clutch of the transmission is qualified or not is judged, and the yield of the transmission product is improved.
Optionally, before acquiring the actual output rotation speed of each gear of the transmission at the set driving rotation speed by using the output end motor, the method further includes: and driving the speed changer by using the input end motor according to the set driving rotating speed.
As mentioned above, the input motor provides a stable rotational speed input value for driving, and typically simulates an engine.
Specifically, an input end motor drives a transmission according to a set driving rotating speed, a double-clutch transmission is respectively connected with a specific odd gear and a specific even gear and connected with an engine, an inner shaft and an outer shaft of the input end motor are respectively meshed with the odd gear or the even gear, the gear which is specifically and firmly connected with an output shaft of an output end motor is determined through a gear shifting structure with a dog tooth gear, the gear is prepared in advance before the next gear is changed, once a gear shifting instruction is sent by a traveling computer, the gear can directly transmit power, the output end motor is used for collecting the actual output rotating speed of each gear of the transmission under the set driving rotating speed, and a foundation is provided for subsequently determining the qualified condition of the surface smoothness of the clutch under each gear.
Optionally, the acquiring, by the output end motor, an actual output rotation speed of each gear of the transmission at the set driving rotation speed includes: and in the process of sequentially upshifting or downshifting, the actual output rotating speed of each gear of the transmission at the set driving rotating speed is acquired by using the output end motor.
Specifically, during the sequential upshift, one of the dual clutches is controlled to pre-engage the lowest gear inside, for example, n gears in total, the pre-engaged lowest gear is gear 1, and the other clutch transmission is controlled to pre-engage gear 2, at which time the clutch in gear 1 is in a fully engaged state and the clutch in gear 2 is in a fully disengaged state, without affecting the torque transmission in gear 1, the actual output rotation speed of the transmission in gear 1 at the set driving rotation speed is collected by the output motor, and the actual output rotation speed at gear 1 is recorded, immediately after that, when the gear is gear 2, gear 1 is exited, and the other clutch transmission is pre-engaged in gear 3, at which time the clutch in gear 2 is in a fully engaged state and the clutch in gear 3 is in a fully disengaged state, the torque transmission of the 2 gear is not affected, the actual output rotating speed of the transmission in the 2 gear under the set driving rotating speed is collected by using the output end motor, the actual output rotating speed of the transmission in the 2 gear is recorded, and in the sequential gear-up process, the logic for controlling the engaging or disengaging of the double-clutch transmission is carried out according to the logic until the actual output rotating speeds of all gears are tested.
In another case, during the sequential downshift, the inside of one of the dual clutches is controlled to engage the highest gear in advance, for example, there are n gears in total, the highest gear engaged in advance is n gears, and the inside of the other clutch transmission is engaged in advance to n-1 gears, at this time, the clutch located in n gear is in a completely engaged state, and the clutch located in n-1 gear is in a completely disengaged state, and there is no influence on the torque transmission of n gears.
Optionally, before the step of acquiring the actual output rotation speed of each gear of the transmission at the set driving rotation speed by using the output end motor, the method further includes: and controlling the clutch belonging to the current gear to be in a fully engaged state, and controlling the clutch belonging to the non-current gear to be in a fully disengaged state.
The description of the shift control automatic gear adjustment of the dual clutch transmission is described in the above embodiments, and will not be repeated herein.
Alternatively, the range of the driving rotation speed is set to 1500-3000 rpm.
In order to ensure steady-state speed control and provide stable and reliable power input for the dual clutch transmission, the driving speed should be closely related to the actual output speed or torque of the engine, if the driving speed exceeds the bearing capacity of the engine, cylinder explosion or crankshaft damage may occur seriously, increasing the risk of driving, in this embodiment, the interval range of the driving speed is preferably set to 1500-3000 rpm.
Fig. 2 is a schematic structural diagram of a system for testing the surface flatness of a friction plate of a dual clutch transmission according to an embodiment of the present invention. The test system 20 is integrated into a down-line test bench, as shown in fig. 2, the test system 20 includes: the system comprises an output end motor 21 used for collecting actual output rotating speed of each gear of the transmission under set driving rotating speed, a deviation calculating module 22 used for determining theoretical output rotating speed of each gear under set driving rotating speed according to transmission ratio of a transmission assembly under each gear, and determining actual rotating speed deviation of the actual output rotating speed and the theoretical output rotating speed under each gear, and a flatness judging module 23 used for comparing the actual rotating speed deviation with reference threshold deviation obtained according to a single clutch friction plate flatness test, determining qualified conditions of clutch surface flatness under each gear, integrating qualified conditions of clutch surface flatness under each gear, and judging whether the clutch surface flatness of the transmission is qualified or not.
As mentioned above, the transmission ratio of the transmission assembly in each gear is the ratio of the rotational speeds of the front and rear transmission mechanisms of the transmission in the automobile transmission system, and is a fixed value. In the process of using the transmission, a stable rotation speed input value for driving is provided through an input end motor, the theoretical output rotation speed of each gear is equal to the stable rotation speed input value for driving/the transmission ratio of the transmission assembly under each gear, and the process of calculating the theoretical output rotation speed of each gear is realized in the deviation calculating module 22 in the embodiment.
It should be noted that the deviation calculating module 22 and the flatness determining module 23 are similar to computer modules in an offline testing bench, and have data analysis and calculation capabilities, and the calculation of the actual rotation speed deviation and the comparison between the actual rotation speed deviation and the reference threshold deviation known in the flatness test of a single clutch friction plate are performed by the similar computer modules, and the specific working principle is well known by those skilled in the art, and is not described herein again.
Optionally, with continued reference to FIG. 2, the test system 20 further includes an input motor 24, the input motor 24 being configured to drive the transmission at a set drive speed.
Optionally, with continued reference to fig. 2, the test system 20 further includes a clutch solenoid control module 25, where the clutch solenoid control module 25 is configured to control the clutch belonging to the current gear to be in a fully engaged state, and to control the clutch belonging to the non-current gear to be in a fully disengaged state.
On the basis of the embodiment, the double-clutch transmission is provided with two clutches, gears are automatically adjusted through a gear shifting control circuit and a mechanical electronic module to realize power transmission, the two clutches are mutually and alternately operated and are respectively connected with an engine through the clutches 1 and 2, an input inner shaft and an outer shaft are respectively meshed with an odd gear or an even gear, a gear which is in hard connection with an output shaft is determined through a gear shifting structure with a dog gear, the gear is prepared in advance before the gear is shifted to the next gear, and once a traveling computer sends a gear shifting instruction, the gear can directly transmit power, and the continuity of gear shifting switching is ensured.
Two clutches, one controlling odd 1, 3, 5 gears and the other controlling even 2, 4, 6 gears, illustratively, one clutch of the dual clutch pre-engages odd gear 1 gear, the other clutch is engaged with the even-numbered gear 2 in advance, when the output end motor acquires the actual output rotating speed of the odd-numbered gear 1 of the transmission at the set driving rotating speed, the clutch solenoid control module 25 controls the clutch to be in a complete engagement state in the 1 st gear and is further used for controlling the clutch to be in a complete disengagement state in the 2 nd gear, specifically, the clutch solenoid control module 25 is used for engaging through a control current set to imA of the clutch solenoid corresponding to the 1 st gear in the odd-numbered gear, and setting a control current set to 0mA of the clutch solenoid corresponding to the 2 nd gear in the even-numbered gear to disengage, and recording an actual output rotating speed in the 1 st gear in the odd-numbered gear.
Through the embodiment, the actual output rotating speeds of all gears can be measured, and the qualified conditions of the surface flatness of the clutch under each gear are integrated by combining the embodiment, so that whether the surface flatness of the clutch of the transmission is qualified or not is judged.
The system for testing the surface smoothness of the friction plate of the dual clutch transmission provided by the embodiment comprises an output end motor, a deviation calculation module and a smoothness determination module, wherein the actual output rotating speed of each gear of the transmission under the set driving rotating speed is collected through the output end motor, the theoretical output rotating speed of each gear under the set driving rotating speed is determined through the deviation calculation module according to the transmission ratio of a transmission assembly under each gear, the actual rotating speed deviation between the actual output rotating speed and the theoretical output rotating speed under each gear is determined, the actual rotating speed deviation is compared with the standard threshold value deviation obtained according to the smoothness test of a single clutch friction plate through the smoothness determination module, the qualified condition of the surface smoothness of the clutch under each gear is determined, the qualified condition of the surface smoothness of the clutch under each gear is synthesized, and whether the surface smoothness of the clutch of the transmission is qualified or not is judged, therefore, unqualified samples of the surface flatness of the friction plate can be detected, over-tolerance products can be prevented from flowing into the market, and the yield of transmission products can be further improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method for testing the surface flatness of a friction plate of a dual clutch transmission is applied to an off-line test bench and comprises the following steps:
acquiring the actual output rotating speed of each gear of the transmission at the set driving rotating speed by using an output end motor;
determining the theoretical output rotating speed of each gear under the set driving rotating speed according to the transmission ratio of the transmission assembly under each gear;
determining actual rotating speed deviation of the actual output rotating speed and the theoretical output rotating speed under each gear;
comparing the actual rotating speed deviation with a reference threshold value deviation obtained according to a single clutch friction plate flatness test, and determining the qualified condition of the surface flatness of the clutch under each gear;
and (4) integrating the qualified conditions of the surface flatness of the clutch under each gear, and judging whether the surface flatness of the clutch of the transmission is qualified or not.
2. The test method according to claim 1, wherein the step of acquiring the actual output rotation speed of each gear of the transmission at the set driving rotation speed by using the output motor further comprises the following steps:
and driving the speed changer by using the input end motor according to the set driving rotating speed.
3. The test method according to claim 1, wherein the step of acquiring the actual output rotation speed of each gear of the transmission at the set driving rotation speed by using the output end motor comprises the following steps:
and in the process of sequentially upshifting or downshifting, acquiring the actual output rotating speed of each gear of the transmission at the set driving rotating speed by using an output end motor.
4. The test method according to claim 1, before acquiring the actual output rotation speed of each gear of the transmission at the set driving rotation speed by using the output motor, further comprising:
controlling a clutch to which the current gear belongs to be in a fully engaged state;
and controlling the clutch belonging to the non-current gear to be in a completely separated state.
5. The method of claim 1, wherein comparing the actual rotational speed deviation with a baseline threshold deviation obtained from a single clutch friction plate flatness test to determine clutch surface flatness pass-through at each gear comprises:
when the actual rotating speed deviation is larger than the reference threshold value deviation obtained according to the flatness test of the single clutch friction plate, judging that the surface flatness of the clutch under the current gear is unqualified;
and when the actual rotating speed deviation is less than or equal to the reference threshold value deviation obtained according to the single clutch friction plate flatness test, judging that the clutch surface flatness under the current gear is qualified.
6. The test method according to claim 1, wherein the step of determining whether the clutch surface flatness of the transmission is acceptable by integrating the acceptable clutch surface flatness in each gear comprises the steps of:
and when the surface evenness of the clutch is unqualified under any gear, judging that the surface evenness of the clutch of the transmission is unqualified.
7. The testing method as claimed in claim 1, wherein the range of the set driving speed is 1500-3000 rpm.
8. A friction plate surface flatness testing system of a dual clutch transmission, integrated in an off-line test bench, the testing system comprising:
the output end motor is used for acquiring the actual output rotating speed of each gear of the transmission at the set driving rotating speed;
the deviation calculation module is used for determining the theoretical output rotating speed of each gear under the set driving rotating speed according to the transmission ratio of the transmission assembly under each gear, and determining the actual rotating speed deviation between the actual output rotating speed and the theoretical output rotating speed under each gear;
the flatness judging module is used for comparing the actual rotating speed deviation with a reference threshold value deviation obtained according to a single clutch friction plate flatness test and determining the qualified condition of the surface flatness of the clutch under each gear; and the qualified condition of the surface evenness of the clutch under each gear is integrated, and whether the surface evenness of the clutch of the transmission is qualified or not is judged.
9. The test system of claim 8, further comprising an input motor for driving the transmission at the set drive speed.
10. The test system according to claim 8, further comprising a clutch solenoid control module, wherein the clutch solenoid control module is used for controlling the clutch belonging to the current gear to be in a fully engaged state and controlling the clutch belonging to the non-current gear to be in a fully disengaged state.
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| CN115267258A (en) * | 2022-07-28 | 2022-11-01 | 中国第一汽车股份有限公司 | Method and device for checking measured values of rotational speed of dual clutch transmission and storage medium |
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