CN114485536B - Friction plate surface flatness testing method and system for double-clutch transmission - Google Patents
Friction plate surface flatness testing method and system for double-clutch transmission Download PDFInfo
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- CN114485536B CN114485536B CN202210100304.XA CN202210100304A CN114485536B CN 114485536 B CN114485536 B CN 114485536B CN 202210100304 A CN202210100304 A CN 202210100304A CN 114485536 B CN114485536 B CN 114485536B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
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Abstract
The embodiment of the invention discloses a friction plate surface flatness testing method and system of a dual clutch transmission. The method comprises the steps of collecting actual output rotating speeds of a transmission at set driving rotating speeds by utilizing an output end motor, determining theoretical output rotating speeds of the transmission assembly at the set driving rotating speeds according to the transmission ratio of the transmission assembly at the various gears, determining actual rotating speed deviation of the actual output rotating speeds and the theoretical output rotating speeds at the various gears, comparing the actual rotating speed deviation with a reference threshold deviation obtained according to a single clutch friction plate flatness test, determining qualified conditions of clutch surface flatness at the various gears, and finally, integrating qualified conditions of clutch surface flatness at the various gears to judge whether the clutch surface flatness of the transmission is qualified. According to the technical scheme, the unqualified sample of the surface flatness of the friction plate can be detected, the out-of-tolerance product is prevented from flowing into the market, and the yield of the transmission product is further improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of clutch friction plate detection, in particular to a friction plate surface flatness testing method and system of a double-clutch transmission.
Background
The clutch is an important part for ensuring the functions of stable starting, smooth gear shifting, light operation and the like of the automobile. For friction type clutches, the performance of the friction plate directly affects the service life of the clutch, the stability of an automobile transmission system and the safety of vehicle use, and research on the performance of the friction plate of the clutch is increasingly focused at home and abroad, and the friction plate flatness is particularly focused.
In the existing wet double-clutch type automatic transmission scheme, the transmission route from an engine to a transmission torque and power is carried out by controlling the engagement of a plurality of wet clutches, and the quality control is inconsistent in the production and manufacturing or assembly process, so that the surface flatness of friction plates in the wet clutches is out of tolerance, the linearity of the torque transmitted by corresponding clutches is poor, the torque transmission curve which is shown to the whole vehicle layer is out of tolerance, the surface flatness of the friction plates exceeds a normal index, and out-of-tolerance products flow into the market, and complaints of users are caused.
Disclosure of Invention
The embodiment of the invention provides a friction plate surface flatness testing method and system for a dual clutch transmission, which are used for detecting a sample with unqualified friction plate surface flatness, avoiding the over-bad products from flowing into the market and further improving the yield of the transmission products.
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 offline test bench, and the method includes:
the method comprises the steps that an output end motor is utilized to collect the actual output rotating speed of each gear of the transmission under the set driving rotating speed;
determining a theoretical output rotating speed of each gear under a set driving rotating speed according to the transmission ratio of the transmission assembly under each gear;
determining the actual rotation speed deviation of the actual output rotation speed and the theoretical output rotation speed under each gear;
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 clutch surface flatness under each gear;
and (5) comprehensively judging whether the surface flatness of the clutch of the transmission is qualified or not according to the qualified condition of the surface flatness of the clutch under each gear.
Optionally, before the actual output rotation speed of each gear of the transmission at the set driving rotation speed is collected by using the output end motor, the method further comprises:
and driving the transmission according to the set driving rotation speed by using an input end motor.
Optionally, the step of collecting the actual output rotation speed of each gear of the transmission at the set driving rotation speed by using the output end motor includes:
and in the process of sequential upshift or sequential downshift, acquiring the actual output rotation speed of each gear of the transmission under the set driving rotation speed by using an output end motor.
Optionally, before the output end motor is used for acquiring the actual output rotation speed of each gear of the transmission at the set driving rotation speed, the method further comprises:
controlling the clutch to which the current gear belongs to be in a fully engaged state;
and controlling the clutch to which the non-current gear belongs 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 the qualified condition of the clutch surface flatness under each gear comprises:
when the actual rotation speed deviation is larger than a reference threshold deviation obtained according to the single clutch friction plate flatness test, judging that the clutch surface flatness is unqualified in the current gear;
and when the actual rotation speed deviation is smaller than or equal to the reference threshold deviation obtained according to the single clutch friction plate flatness test, judging that the clutch surface flatness is qualified under the current gear.
Optionally, the step of determining whether the clutch surface flatness of the transmission is acceptable by integrating the clutch surface flatness qualification conditions under each gear includes:
and when the clutch surface flatness is unqualified under any gear, judging that the clutch surface flatness of the transmission is unqualified.
Optionally, the interval range of the set driving rotation speed is 1500-3000rpm.
In a second aspect, an embodiment of the present invention further provides a friction plate surface flatness test system for a dual clutch transmission, where a test barrel is integrated in an offline test bench, the test system including:
the output end motor is used for collecting the actual output rotation speed of each gear of the transmission under the set driving rotation 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 of the actual output rotating speed and the theoretical output rotating speed under each gear;
the flatness judging module is used for 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; and the qualified condition of the surface flatness of the clutch under each gear is synthesized, and whether the surface flatness of the clutch of the transmission is qualified is judged.
Optionally, the motor driving device further comprises an input end motor, wherein the input end motor is used for driving the transmission according to the set driving rotating speed.
Optionally, the clutch electromagnetic valve control module is further included, and the clutch electromagnetic valve 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.
The embodiment of the invention provides a method and a system for testing the surface evenness of a friction plate of a dual clutch transmission, wherein in the scheme of the embodiment of the invention, the testing method is applied to an offline test bench and comprises the following steps: the method comprises the steps of collecting actual output rotating speeds of a transmission at set driving rotating speeds by utilizing an output end motor, determining theoretical output rotating speeds of the transmission assembly at the set driving rotating speeds according to transmission ratios of the transmission assembly at the various gears, determining actual rotating speed deviations of the actual output rotating speeds and the theoretical output rotating speeds at the various gears, comparing the actual rotating speed deviations with a reference threshold deviation obtained according to a single clutch friction plate flatness test, determining qualified conditions of clutch surface flatness at the various gears, and finally, integrating qualified conditions of clutch surface flatness at the various gears to determine whether the clutch surface flatness of the transmission is qualified or not, so as to detect samples with unqualified friction plate surface flatness, avoid ultra-poor products from flowing into the market, and further improve the yield of the transmission products.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the accompanying drawings in which:
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 surface flatness of a friction plate of a dual clutch transmission according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently, or at the same time. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.
The term "comprising" and variants thereof as used herein is 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 terms "first," "second," and the like herein are merely used for distinguishing between corresponding contents and not for defining a sequential or interdependent relationship.
It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those skilled in the art will appreciate that "one or more" is intended to be construed as "one or more" unless the context clearly indicates 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 test method is applied to an offline test bench, as shown in fig. 1, and specifically comprises the following steps:
s110, acquiring the actual output rotation speed of each gear of the transmission under the set driving rotation speed by utilizing an output end motor.
The output end motor is integrated in the offline test bench, the double-clutch transmission is based on the basic principle of a manual transmission, two sets of clutches are adopted, the gear is automatically adjusted through a gear shifting control circuit and a mechanical electronic module according to the driving rotation speed value input by the input end motor connected with the transmission, power transmission is realized, the two sets of clutches work alternately mutually and are respectively connected with an engine through clutches 1 and 2, the input inner shaft and the output shaft are respectively meshed with odd gears or even gears, the gear which is specifically hard connected with the output shaft is determined through a gear shifting structure with dog gears, the gear is prepared in advance before the gear is changed into the next gear, and once a driving computer sends a gear shifting instruction, the gear can directly transmit power, and the continuity of gear shifting and switching is ensured. By way of example, two clutches, one controlling odd 1, 3, 5 gears and the other controlling even 2, 4, 6 gears, when using 1 gear, 2 gears are ready to be switched at any time to achieve the effect of gapless gear shifting, the gear shifting time is greatly shortened by only switching the clutches, and the dual clutch transmission has the characteristics of high transmission efficiency and high reliability.
Specifically, the two clutches are operated independently during the use of the dual clutch, and the gears are pre-determined according to the information such as the engine speed, the vehicle speed, the throttle opening degree and the like, for example, when the gear is accelerated by 2, the gear 3 is in a preparation state, the gear 3 is switched to the gear 3 from the gear 2, and only the even-numbered gear clutch is separated and the odd-numbered gear clutch is engaged.
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 transmission mechanism and the rear transmission mechanism of the transmission in the automobile transmission system, which is also called a speed ratio, in the same automobile model, the speed ratio of the transmission has different values according to the different gears used, and the transmission ratio of the transmission assembly of various types of automobiles can be found in an automobile performance data manual.
Specifically, in the present embodiment, the theoretical output rotation speed of each gear is represented by n. During use of the transmission, a steady rotational speed input value for driving is provided by an input motor, and the theoretical output rotational speed n=steady rotational speed input value for driving for each gear/gear ratio of the transmission assembly under each gear.
S130, determining actual rotation speed deviation of the actual output rotation speed and the theoretical output rotation speed under each gear.
In the present embodiment, the actual rotational speed deviation value is denoted by P. Based on the steps, the actual output rotation speed of each gear of the transmission under the set driving rotation speed collected by the motor at the output end and the theoretical output rotation speed n of each gear are obtained according to the ratio of the stable rotation speed input value provided by the motor at the input end and the transmission ratio of the transmission assembly under each gear, so that the actual rotation speed deviation P=the actual output rotation speed under each gear-the theoretical output rotation speed n of each gear can be calculated.
And S140, 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.
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 type of transmission, an empirical value of the flatness of the clutch friction plate corresponding to each gear in the transmission is obtained, and the empirical value is used as a reference value of the surface flatness of the clutch friction plate in a subsequent actual detection process. It should be noted that, the reference threshold deviation Pi of the flatness of the friction plate of the clutch corresponding to each gear is obtained by a specific person during the early test, and in this embodiment, when the condition that the flatness of the clutch surface is qualified under each gear is determined, the reference threshold deviation Pi is used as a specific empirical value to perform 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 comprises: and when the actual rotation speed deviation is smaller than or equal to the reference threshold deviation obtained according to the single clutch friction plate flatness test, judging that the clutch surface flatness under the current gear is qualified.
Based on the embodiment, the situation that the flatness of the clutch surface in each gear is qualified can be further determined according to the comparison between the actual rotation speed deviation P in each gear and the reference threshold deviation Pi of the flatness of the clutch friction plate corresponding to each gear.
For example, when the clutch gear is in 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 1 gear, and then the clutch surface flatness is determined to be unqualified in 1 gear, which means that the surface flatness of the clutch friction plate in the gear is out of tolerance.
When the clutch gear is in the 1 gear, the calculated actual rotation speed deviation P is smaller than or equal to the reference threshold deviation Pi of the flatness of the corresponding clutch friction plate in the 1 gear, and the clutch surface flatness in the 1 gear is judged to be qualified, and when the clutch gear is switched from the 1 gear to the 2 gear, the effect of gapless gear shifting can be achieved.
S150, the condition that the surface flatness of the clutch is qualified under each gear is synthesized, and whether the surface flatness of the clutch of the transmission is qualified is judged.
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 determined through comprehensively recording the qualified conditions of the surface flatness of the clutch under each gear.
Optionally, the step of determining whether the clutch surface flatness of the transmission is acceptable by integrating the clutch surface flatness qualification conditions under each gear includes: and when the surface flatness of the clutch is unqualified under any gear, judging that the surface flatness of the clutch of the transmission is unqualified.
It can be understood that whether the flatness of the clutch surface in a certain gear is qualified is determined by comparing the actual rotation speed deviation P in the gear with the reference threshold deviation Pi of the flatness of the clutch friction plate corresponding to the gear, if the calculated actual rotation speed deviation P is larger than the reference threshold deviation Pi of the flatness of the clutch friction plate corresponding to 1 gear, the flatness of the clutch surface in the gear is determined to be disqualified, the fact that the flatness of the clutch friction plate in the gear is out of tolerance is indicated, in all gears, the condition that the flatness of the clutch friction plate in the gear is disqualified already exists is shown, and in order to avoid that the output end motor generates corresponding torque fluctuation after the clutch is engaged in the gear so as to influence the instability of the whole transmission, the flatness of the clutch surface of the whole transmission is directly determined to be disqualified, so that the out-of-tolerance product is prevented from flowing into the market, and the yield of the transmission product is improved.
According to the specific implementation mode of the steps, the actual rotation speed deviation P in each gear is calculated to be smaller than or larger than the reference threshold deviation Pi of the flatness of the corresponding clutch friction plate in the gear to be tested, the flatness of the clutch surface in each gear is judged to be qualified, the condition that the flatness of the clutch surface in all gears is qualified is synthesized, and the flatness of the clutch surface of the transmission is judged to be qualified.
The embodiment provides a friction plate surface flatness testing method of a dual clutch transmission, which is applied to an offline test bench, and comprises the following steps: the method comprises the steps of collecting actual output rotating speeds of a transmission at set driving rotating speeds by utilizing an output end motor, determining theoretical output rotating speeds of the transmission assembly at the set driving rotating speeds according to transmission ratios of the transmission assembly at the set driving rotating speeds, determining actual rotating speed deviations of the actual output rotating speeds and the theoretical output rotating speeds at the various gears, comparing the actual rotating speed deviations at the various gears with a reference threshold deviation obtained according to a single clutch friction plate flatness test at the various gears, judging that the surface flatness of the clutch at the current gear is unqualified when the actual rotating speed deviations are larger than the reference threshold deviation obtained according to the single clutch friction plate flatness test, judging that the surface flatness of the clutch at the current gear is qualified when the actual rotating speed deviations are smaller than or equal to the reference threshold deviation obtained according to the single clutch friction plate flatness test, determining that the surface flatness of the clutch at the current gear is qualified, detecting samples of the surface flatness failure of the clutch at the various gears, avoiding that ultra-poor products flow into the market, and finally, comprehensively judging that whether the surface flatness of the clutch at the transmission is qualified or not.
Optionally, before the actual output rotation speed of each gear of the transmission at the set driving rotation speed is collected by using the output end motor, the method further comprises: the input motor is used for driving the speed changer according to the set driving rotating speed.
As described above, the input motor provides a steady rotational speed input for driving, typically the input motor simulates an engine.
Specifically, the input end motor drives the transmission according to the set driving rotation speed, the double clutch transmission is respectively connected with a specific odd gear and an even gear, the inner shaft and the outer shaft of the input end motor are respectively meshed with the odd gear or the even gear, the gear which is specifically and rigidly connected with the output shaft of the output end motor is determined through a gear shifting structure with a dog gear, before the gear is changed to the next gear, the gear is prepared in advance, once a driving computer sends a gear shifting instruction, the gear can directly transmit power, the output end motor is utilized to collect the actual output rotation speed of each gear of the transmission at the set driving rotation speed, and a basis is provided for the follow-up determination of the qualified condition of the surface flatness of the clutch under each gear.
Optionally, the step of collecting the actual output rotation speed of each gear of the transmission at the set driving rotation speed by using the output end motor includes: in the process of sequential upshift or sequential downshift, the output end motor is utilized to collect the actual output rotation speed of each gear of the transmission under the set driving rotation speed.
Specifically, during sequential upshifts, the lowest gear is pre-engaged in one clutch transmission of the dual clutch, for example, n gears in total, the lowest gear that is pre-engaged is 1 gear, the clutch that is in 2 gear is pre-engaged in the other clutch transmission, at this time, the clutch that is in 1 gear is in a fully engaged state, the clutch that is in 2 gear is in a fully disengaged state, no effect is exerted on torque transmission in 1 gear, the actual output rotation speed of the transmission at 1 gear is collected by the output motor, and the actual output rotation speed at 1 gear is recorded, then, when the gear is 2 gear, the gear is exited from 1 gear, the other clutch transmission is pre-engaged in 3 gear, at this time, the clutch that is in 2 gear is in a fully engaged state, the clutch that is in 3 gear is in a fully disengaged state, no effect is exerted on torque transmission in 2 gear, the actual output rotation speed of the transmission at 2 gear is collected by the output motor, the actual output rotation speed at 2 gear is recorded at 2 gear, and during sequential control, the actual output rotation speeds are recorded until all the gears are actually engaged or disengaged in the gear according to the sequential control.
In another case, during the sequential downshift, the highest gear is pre-engaged in one clutch transmission of the dual clutch, for example, n gear is total, the highest gear that is pre-engaged is n gear, the other clutch transmission is pre-engaged with n-1 gear, at this time, the clutch at n gear is in a fully engaged state, the clutch at n-1 gear is in a fully disengaged state, the torque transmission of n gear is not affected, the output end motor is utilized to collect the actual output rotation speed of the transmission at n gear under the set driving rotation speed, and the actual output rotation speed at n gear is recorded.
Optionally, before the output end motor is used for acquiring the actual output rotation speed of each gear of the transmission at the set driving rotation speed, the method further comprises: and controlling the clutch of the current gear to be in a fully-engaged state, and controlling the clutch of the non-current gear to be in a fully-disengaged state.
The description of the shift control automatic adjustment gear of the dual clutch transmission has been described in the above embodiments, and will not be repeated here.
Alternatively, the driving rotation speed is set in a range of 1500-3000rpm.
The input motor drives the transmission according to a set driving speed, 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, damage such as cylinder explosion or crankshaft can seriously occur, and the risk of driving is increased.
Fig. 2 is a schematic structural diagram of a system for testing 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 in an offline test rack, as shown in fig. 2, the test system 20 includes: the output motor 21 is used for collecting the actual output rotation speed of the transmission at each gear under the set driving rotation speed, the deviation calculation module 22 is used for determining the theoretical output rotation speed of the transmission assembly at each gear under the set driving rotation speed according to the transmission ratio of the transmission assembly at each gear, determining the actual rotation speed deviation of the actual output rotation speed and the theoretical output rotation speed at each gear, and the flatness judgment module 23 is used for comparing the actual rotation speed deviation with a reference threshold deviation obtained according to the single clutch friction plate flatness test, determining the qualified condition of the clutch surface flatness at each gear, and comprehensively determining whether the clutch surface flatness of the transmission is qualified or not according to the qualified condition of the clutch surface flatness at each gear.
As described above, the gear 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 transmission system of the automobile, and is a constant value. In use of the transmission, the process of calculating the theoretical output speed of each gear is implemented in the deviation calculation module 22 in this embodiment by providing a steady speed input value for driving via an input motor, the theoretical output speed of each gear=steady speed input value for driving/gear ratio of the transmission assembly under each gear.
It should be noted that, the deviation calculating module 22 and the flatness determining module 23 are similar to computer modules in the offline test bench, and have data analysis and calculation capabilities, so that the calculation of the actual rotational speed deviation and the comparison between the actual rotational speed deviation and the reference threshold deviation known in the single clutch friction plate flatness test are performed by similar computer modules, and the specific working principle thereof is well known to those skilled in the art and will not be repeated herein.
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, the clutch solenoid control module 25 being configured to control the clutch associated with the current gear to be in a fully engaged state and to control the clutch associated with the non-current gear to be in a fully disengaged state.
On the basis of the embodiment, the two sets of clutches for the double-clutch transmission automatically adjust gears through a gear shift control circuit and a mechanical electronic module to realize power transmission, the two sets of clutches are respectively connected with an engine through clutches 1 and 2 in an alternating mode, an input inner shaft and an output shaft are respectively meshed with odd gears or even gears, the gears which are specifically hard connected with an output shaft are determined through a gear shift structure with dog gears, the gears are prepared in advance before the gears are changed to the next gear, and once a driving computer sends a gear shift instruction, the gears can directly transmit power to ensure the continuity of gear shift switching.
The two clutches, one of which controls odd gears 1, 3 and 5 and the other of which controls even gears 2, 4 and 6, are exemplified, one clutch of the double clutch is pre-engaged with odd gear 1 and the other clutch is pre-engaged with even gear 2, and the output end motor collects the actual output rotation speed of the transmission in odd gear 1 at the set driving rotation speed, the clutch electromagnetic valve control module 25 controls the clutch belonging to the 1-gear to be in a fully engaged state and also controls the clutch belonging to the 2-gear to be in a fully disengaged state, specifically, the clutch electromagnetic valve control module 25 realizes the combination by setting the control current of the clutch electromagnetic valve corresponding to the 1-gear in the odd gear to imA, sets the control current of the clutch electromagnetic valve corresponding to the 2-gear in the even gear to be 0mA to realize the separation, and records the actual output rotation speed in the 1-gear in the odd gear.
By the aid of the embodiment, the actual output rotation speed of all gears can be measured, and the situation that the flatness of the clutch surface of each gear is qualified is combined with the embodiment, so that whether the flatness of the clutch surface of the transmission is qualified is judged.
The system for testing the surface flatness of the friction plate of the dual-clutch transmission comprises an output end motor, a deviation calculation module and a flatness judgment module, wherein the output end motor is used for collecting the actual output rotating speed of each gear of the transmission at a set driving rotating speed, the deviation calculation module is used for determining the 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 the actual rotating speed deviation of the actual output rotating speed and the theoretical output rotating speed at each gear, the flatness judgment module is used for comparing the actual rotating speed deviation with a reference threshold value deviation obtained according to the single clutch friction plate flatness test, determining the qualified condition of the clutch surface flatness at each gear, and integrating the qualified condition of the clutch surface flatness at each gear to judge whether the clutch surface flatness of the transmission is qualified or not, so that samples with unqualified friction plate surface flatness are detected, and the yield of ultra-poor products flowing into the market is further improved.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (10)
1. The method for testing the surface flatness of the friction plate of the double clutch transmission is characterized by being applied to an offline test bench, and comprises the following steps of:
the method comprises the steps that an output end motor is utilized to collect the actual output rotating speed of each gear of the transmission under the set driving rotating speed;
determining a theoretical output rotating speed of each gear under a set driving rotating speed according to the transmission ratio of the transmission assembly under each gear;
determining the actual rotation speed deviation of the actual output rotation speed and the theoretical output rotation speed under each gear;
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 clutch surface flatness under each gear;
and (5) comprehensively judging whether the surface flatness of the clutch of the transmission is qualified or not according to the qualified condition of the surface flatness of the clutch under each gear.
2. The test method according to claim 1, wherein the step of collecting the actual output rotation speed of the transmission at each gear before the set driving rotation speed by using the output motor further comprises:
and driving the transmission according to the set driving rotation speed by using an input end motor.
3. The test method according to claim 1, wherein the step of collecting the actual output rotation speed of the transmission at the set driving rotation speed by using the output motor includes:
and in the process of sequential upshift or sequential downshift, acquiring the actual output rotation speed of each gear of the transmission under the set driving rotation speed by using an output end motor.
4. The test method according to claim 1, further comprising, before the actual output rotation speed of each gear of the transmission at the set driving rotation speed is acquired by the output motor:
controlling the clutch to which the current gear belongs to be in a fully engaged state;
and controlling the clutch to which the non-current gear belongs to be in a completely separated state.
5. The test method according to claim 1, wherein comparing the actual rotational speed deviation with a reference threshold deviation obtained according to a single clutch disc flatness test, determining a clutch surface flatness qualification condition for each gear comprises:
when the actual rotation speed deviation is larger than a reference threshold deviation obtained according to the single clutch friction plate flatness test, judging that the clutch surface flatness is unqualified in the current gear;
and when the actual rotation speed deviation is smaller than or equal to the reference threshold deviation obtained according to the single clutch friction plate flatness test, judging that the clutch surface flatness is qualified under the current gear.
6. The test method of claim 1, wherein determining whether the clutch surface flatness of the transmission is acceptable by integrating the clutch surface flatness eligibility conditions for each gear comprises:
and when the clutch surface flatness is unqualified under any gear, judging that the clutch surface flatness of the transmission is unqualified.
7. The test method according to claim 1, wherein the interval range of the set driving rotation speed is 1500-3000rpm.
8. A friction plate surface flatness testing system of a dual clutch transmission, characterized by being integrated in an offline test bench, the testing system comprising:
the output end motor is used for collecting the actual output rotation speed of each gear of the transmission under the set driving rotation 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 of the actual output rotating speed and the theoretical output rotating speed under each gear;
the flatness judging module is used for 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; and the qualified condition of the surface flatness of the clutch under each gear is synthesized, and whether the surface flatness of the clutch of the transmission is qualified 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 of claim 8, further comprising a clutch solenoid control module for controlling a clutch to which a current gear belongs to be in a fully engaged state and for controlling a clutch to which a non-current gear belongs to be in a fully disengaged state.
Priority Applications (1)
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