CN108757643A - A kind of hydraulic system initial failure active removing method - Google Patents
A kind of hydraulic system initial failure active removing method Download PDFInfo
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- CN108757643A CN108757643A CN201810725309.5A CN201810725309A CN108757643A CN 108757643 A CN108757643 A CN 108757643A CN 201810725309 A CN201810725309 A CN 201810725309A CN 108757643 A CN108757643 A CN 108757643A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
- F15B19/005—Fault detection or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/87—Detection of failures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/80—Other types of control related to particular problems or conditions
- F15B2211/875—Control measures for coping with failures
Abstract
The invention discloses a kind of hydraulic system initial failure active removing methods, before being eliminated to initial failure, following steps are first used to actively discover the initial failure of hydraulic system：According to the historical data of the numerically-controlled machine tool initial failure of same model, early fault period time t2 is obtaineds, the average time between failures MTBF of numerically-controlled machine toolsOr failure rate λsAnd other parameter thresholds；With maximum actuation frequency operating numerical control lathe, its each operating point is set to be in full load condition, after hydraulic system steady operation, the parameter of detection hydraulic system in real time, and it is compared with corresponding parameter threshold, any parameter is more than its corresponding given threshold, and average time between failures MTBF < MTBFsOr λ > λs；Then indicate the initial failure of discovery hydraulic system.The present invention can run early stage in hydraulic system, by detecting its operating parameter, find potential failure, take measures to eliminate failure before failure occurs or develops into catastrophe failure, to improve hydraulic system and numerical control complete machine tool reliability.
Description
Technical field
The invention belongs to hydraulic system technical fields, and in particular to a kind of hydraulic system initial failure active removing method,
Background technology
Hydraulic system is widely used in each industrial circle, is one of the important motivity source for providing power for mechanical device, is
Ensure one of the important composition equipment that mechanical device is effectively run.The quality of hydraulic system runnability directly affects mechanical device
The normal operation of system ensures that the runnability of hydraulic system is to ensure that the key of mechanical device operation.
One hydraulic system is mainly made of dynamical element, executive component, control element, auxiliary element and hydraulic oil, liquid
Important component of the pressure system as numerically-controlled machine tool, mainly to numerical control tool shaft, chuck, cutterhead, knife rest, tailstock, fixture and
Turntable etc. is driven and is controlled, and historical data shows these key feature Frequent Troubles, seriously affects numerically-controlled machine tool
Runnability.Deep reliability consideration is carried out to hydraulic system, improves the reliability of hydraulic system, is to ensure that numerically-controlled machine tool is whole
The effective ways of machine reliability, the competitiveness to promoting numerically-controlled machine tool play key effect.
By for statistical analysis to the fault data in numerically-controlled machine tool operational process, the results showed that numerically-controlled machine tool is using
In the process, crash rate is distributed with run time in tub curve.According to the research to tub curve, find to transport in numerically-controlled machine tool
At row initial stage, crash rate is larger and the trend that tapers off at any time, the failure occurred during this are known as initial failure.In number
Lathe early fault period is controlled, hydraulic system fault accounts for numerically-controlled machine tool machine failure large percentage, reduces hydraulic system fault, can be with
The crash rate of numerically-controlled machine tool complete machine is significantly reduced, numerically-controlled machine tool early fault period is shortened.
Currently, the Failure elimination method of hydraulic system mainly failure generation after, using hydraulic fault removal process into
Row Failure elimination, wherein hydraulic fault removal process mainly detects hydraulic fault, positioning hydraulic fault, isolation hydraulic fault,
The step of finally eliminating hydraulic fault；However, this way to take measures increases the operating cost of equipment afterwards, therefore need
It wants to predict the technology that failure occurs, incipient fault is detected before failure occurs or develops into catastrophe failure and takes corresponding
Measure is eliminated.
Invention content
Failure is eliminated for existing Failure elimination technology is mainly subsequent, cannot achieve and eliminate failure in advance, especially early
The failure of phase age at failure, so the method for proposing prediction failure, accomplishes preventative elimination failure, i.e., actively eliminates failure.This hair
It is bright the technical problem to be solved is that：How to propose that one kind can eliminate hydraulic pressure before failure occurs or develops into catastrophe failure
The method of system early fault period incipient fault, by detect the pressure of hydraulic system, flow, temperature, liquid level, fluid particle and
Return oil filter particle and pressure change rate, flow change rate, rate of temperature change, liquid level change rate, fluid particle change rate
It with return oil filter particle change rate, and is compared with preset threshold value, predicts incipient fault.By judging potential event
The mechanism of barrier is supplied to the suggestion of maintenance personal's fault diagnosis and breakdown maintenance, failure occur or develop into catastrophe failure it
Before take corresponding maintenance measures, realize the purpose for actively eliminating hydraulic system initial failure.
In order to solve the above-mentioned technical problem, present invention employs the following technical solutions：
A kind of hydraulic system initial failure active removing method is included in after finding hydraulic system initial failure, then to morning
The step of phase failure is eliminated；It is characterized in that, before being eliminated to initial failure, first actively discovered using following steps
The initial failure of hydraulic system：
A, according to the historical data of the numerically-controlled machine tool initial failure with model, early fault period time t2 is obtaineds, numerical control machine
The average time between failures MTBF of bedsOr failure rate λs；Occurs historical data when initial failure according to numerically-controlled machine tool simultaneously
Determine the threshold value of following parameters：Fluid level threshold Ls, oil liquid temperature threshold value Ts, fluid granule number threshold valueReturn filter
Granule number threshold valueHydraulic system pressure threshold value Ps, flow rate of hydraulic system threshold value Qs, liquid level change rate threshold value VLs, temperature change
Rate threshold value VTs, fluid granule number change rate threshold valueReturn filter granule number change rate threshold valuePressure change rate threshold
Value VPs, flow change rate threshold value VQs；
B, the hydraulic system of failure to be canceled is installed into numerically-controlled machine tool, has debugged the functional status of numerically-controlled machine tool, protected
Card numerically-controlled machine tool can be correctly completed all feature operations；
C, start hydraulic system makes its each operating point be in full load condition with maximum actuation frequency operating numerical control lathe,
After hydraulic system steady operation, the liquid level L of continuous on-line detection fluid2, the temperature T of continuous on-line detection fluid2, continuously exist
Line detects fluid granule numberContinuous on-line detection return oil filter granule numberContinuous on-line detection hydraulic system pressure
P2, continuous on-line detection flow rate of hydraulic system Q2, by continuous on-line detection to above-mentioned parameter be real-time transmitted on computer, calculate
Each parameter changes with time rate：Liquid level change rate VL2, rate of temperature change VT2, fluid granule number change rateOil return
Filter granule number change ratePressure change rate VP2, flow change rate VQ2；In early fault period time t2sIt is interior, by above-mentioned ginseng
It counts given threshold corresponding respectively to be compared, any parameter is more than its corresponding given threshold, and mean time between failures
Time MTBF < MTBFsOr λ > λs；Then indicate the initial failure of discovery hydraulic system.
Further, further include being carried out actively to the initial failure of hydraulic system in the unloaded state before carrying out step C
It was found that and the step of eliminated, the step of being actively discovered to the initial failure of hydraulic system in the unloaded state, is as follows：
Start hydraulic system, ensures that each work site of numerically-controlled machine tool is in relaxation state, after hydraulic system steady operation, continuously
The liquid level L of on-line checking fluid1, the temperature T of continuous on-line detection fluid1, continuous on-line detection fluid granule numberContinuously exist
Line detects return oil filter granule numberContinuous on-line detection hydraulic system pressure P1, continuous on-line detection flow rate of hydraulic system
Q1；By continuous on-line detection to above-mentioned parameter be real-time transmitted on computer, calculate each parameter and change with time rate, liquid level
Change rate VL1, rate of temperature change VT1, fluid granule number change rateReturn filter granule number change ratePressure becomes
Rate VP1, flow change rate VQ1；In unloaded deadline t1sIt is interior；Above-mentioned parameter is distinguished corresponding given threshold to carry out
Compare, any parameter is more than its corresponding given threshold, then it represents that find the initial failure of hydraulic system in the unloaded state.
Further, in the step that the initial failure of hydraulic system in the unloaded state is actively discovered and eliminated
Further include the steps that initial failure of the hydraulic system under shutdown status is actively discovered and eliminated, to liquid before rapid
The step of initial failure of the pressure system under shutdown status is actively discovered is as follows：Under shutdown status, fluid is detected one by one
Liquid level L0, detect the temperature T of fluid0, detect fluid granule numberDetect return oil filter granule numberAnd respectively with its
Corresponding given threshold is compared, once it is more than its corresponding given threshold, then it represents that find hydraulic system in shutdown status
Under initial failure.
In conclusion the present invention can run early stage in hydraulic system, by detecting its operating parameter, find potential
Failure, occur in failure or take measures before developing into catastrophe failure to eliminate failure, to improve hydraulic system and numerical control
Complete machine tool reliability.
Description of the drawings
Fig. 1 is that hydraulic system initial failure actively eliminates the flow chart implemented.
Specific implementation mode
With reference to embodiment, the present invention is described in further detail.
When specific implementation：As shown in Figure 1, the hydraulic system initial failure to model YKS7225 gear grinding machines carries out actively
It eliminates, includes the following steps,
(1) shutdown status detecting step：Hydraulic system is installed in YKS7225 gear grinding machines, numerically-controlled machine tool has been debugged
Functional status ensures that numerically-controlled machine tool can be correctly completed required function；Then implementation process below is taken：1. detecting fluid
Liquid level is denoted as L0；2. detecting the temperature of fluid, it is denoted as T0；3. detecting fluid granule number4. detecting return oil filter granule numberFluid level threshold is set as Ls, hydraulic fluid temperature threshold value is set as Ts, fluid granule number threshold value is set asReturn filter
Granule number threshold value is set asJudged according to principle below：If detect step (1) 1.~4. have in the parameter of process
Parameter exceeds the threshold value of its setting, then judging hydraulic system, there are incipient faults, by detecting failure, positioning failure, isolation event
Then the step of barrier, takes counter-measure to eliminate incipient fault；After Failure elimination, continue step (1) 1.~4. process, directly
To step (1) 1.~4. during all parameters threshold value all corresponding without departing from its；
More specifically, each service condition and each parameter threshold specifically could be provided as in above-mentioned steps (1), run item
Part：Environment temperature is 10 DEG C~40 DEG C, and each work site is in relaxation state, i.e. service load is 0, hydraulic system pressure 0,
Flow rate of hydraulic system is 0, and hydraulic oil is No. 46 antiwear hydraulic oils, volume of fuel tank 230L；The setting of parameter threshold：Hydraulic oil liquid
Position threshold value LsIt is set as 230mm and 350mm, hydraulic fluid temperature threshold value Ts50 DEG C are set as, fluid granule number threshold valueIt is set as 1.5 ×
108Grain, return filter granule number threshold valueIt is set as 3.0 × 108Grain；
If step (1) judges that hydraulic system without incipient fault, carries out following step (2)：
(2) no-load running detecting step：The connection for checking hydraulic system pipeline, circuit and parts etc., has debugged hydraulic pressure
System makes each work site of hydraulic system be in relaxation state, starts hydraulic system；After hydraulic system steady operation, then adopt
Take implementation process below：1. the liquid level of continuous on-line detection fluid, is denoted as L1；2. the temperature of continuous on-line detection fluid, note
For T1；3. continuous on-line detection fluid granule number, is denoted as4. continuous on-line detection return oil filter granule number, is denoted as
5. continuous on-line detection hydraulic system pressure, is denoted as P1；6. continuous on-line detection flow rate of hydraulic system, is denoted as Q1；By on-line checking
To hydraulic system operating parameter be real-time transmitted on computer, calculate each parameter and change with time rate, 7. liquid level change rate
It is denoted as VL1；8. rate of temperature change is denoted as VT1；9. fluid granule number change rate is denoted as10. return filter granule number changes
Rate is denoted as Pressure change rate is denoted as VP1；Flow change rate is denoted as VQ1；Hydraulic system pressure threshold value is set as Ps, liquid
Pressure flow system flow threshold value is set as Qs, liquid level change rate threshold value is set as VLs, rate of temperature change threshold value is set as VTs, the change of fluid granule number
Rate threshold value is set asReturn filter granule number change rate threshold value is set asPressure change rate threshold value is set as VPs, flow
Change rate threshold value is set as VQs；The no-load running time is detected, is denoted as t1, unloaded deadline is set as t1s；According to principle below into
Row judges：If t1 < t1s, and detect step (2)There is parameter to exceed the threshold value of its setting in the parameter of process,
Then judging hydraulic system, there are incipient faults, shut down, by the step of detecting failure, positioning failure, isolated fault, then take
Counter-measure eliminates incipient fault, after Failure elimination, starts hydraulic system, continues implementation steps (2)Process；If t1
≥t1s, then shut down.
More specifically, each service condition and each parameter threshold specifically could be provided as in above-mentioned steps (2), environmental stress
Condition：Environment temperature is 10 DEG C~40 DEG C, and each work site is in relaxation state, i.e. service load is 0, and hydraulic system pressure is
8MPa, flow rate of hydraulic system 5L/min, hydraulic oil are No. 46 antiwear hydraulic oils, volume of fuel tank 230L；Parameter threshold is set
It sets：Hydraulic system pressure threshold value Ps：It is set as 7.9MPa and 8.1MPa at high pressure, 2.9MPa and 4.1MPa, hydraulic pressure are set as at low pressure
Flow system flow threshold value QsIt is set as 4.9L/min and 5.1L/min, liquid level change rate threshold value VLsIt is set as 5mm/s, rate of temperature change threshold value
VTsIt is set as 0.2 DEG C/s, fluid granule number change rate threshold valueIt is set as 20/s, return filter granule number change rate threshold valueIt is set as 40/s, hydraulic system pressure change rate threshold value VPsIt is set as 0.05MPa/s, flow rate of hydraulic system change rate threshold value
VQsIt is set as 0.05L/s, unloaded deadline t1sIt is set as 50h.
If step (2) judges hydraulic system without incipient fault, and t1 >=t1s, then following step (3) is carried out：
(3) load operating detecting step：Hydraulic system has been debugged, the work under fully loaded of each work site of hydraulic system is made,
Working frequency is in maximum frequency, i.e. the operating frequency of work site is in maximum actuation frequency, starts hydraulic system, hydraulic pressure system
It unites after steady operation, then takes implementation process below：1. the liquid level of continuous on-line detection fluid, is denoted as L2；2. continuously existing
Line detects the temperature of fluid, is denoted as T2；3. continuous on-line detection fluid granule number, is denoted as4. continuous on-line detection oil return is filtered
Oily device granule number, is denoted as5. continuous on-line detection hydraulic system pressure, is denoted as P2；6. continuous on-line detection hydraulic system stream
Amount, is denoted as Q2；By on-line checking to hydraulic system operating parameter be real-time transmitted on computer, calculate each parameter at any time
Change rate, 7. liquid level change rate be denoted as VL2；8. rate of temperature change is denoted as VT2；9. fluid granule number change rate is denoted as10. returning
Oil strainer granule number change rate is denoted as Pressure change rate is denoted as VP2；Flow change rate is denoted as VQ2；Detection load
Run time, is denoted as t2, and load deadline (early fault period time) is set as t2s；Average time between failures threshold value is set as
MTBFsOr fault-rate threshold is set as λs；Judged according to principle below：If t2 < t2s, MTBF < MTBFs(λ >
λs), and detect step (3)There is parameter to exceed the threshold value of its setting in the parameter of process, then judges that hydraulic system is deposited
It in incipient fault, shuts down, by the step of detecting failure, positioning failure, isolated fault, then takes counter-measure to eliminate potential
Failure after Failure elimination, starts hydraulic system, continues implementation steps (3)Process calculates average time between failures
MTBF or failure rate λ；If t2 < t2s, MTBF >=MTBFs(λ≤λs), and detect step (3)The ginseng of process
There is parameter to exceed the threshold value of its setting in number, then judging hydraulic system, there are incipient faults, shut down, by detecting failure, positioning
Then the step of failure, isolated fault, takes counter-measure to eliminate incipient fault, after Failure elimination, start hydraulic system, continue
Carry out step (3)Process calculates average time between failures MTBF or failure rate λ；If t2 >=t2s, MTBF <
MTBFs(λ > λs), and detect step (3)There is parameter to exceed the threshold value of its setting in the parameter of process, then judges
There are incipient faults for hydraulic system, shut down, by the step of detecting failure, positioning failure, isolated fault, then reply are taken to arrange
It applies elimination incipient fault, after Failure elimination, starts hydraulic system, continue step (3)Process, and calculate average event
Hinder interval time MTBF or failure rate λ；If t2 >=t2s, MTBF >=MTBFs(λ≤λs), then it shuts down, it is early to terminate hydraulic system
Phase failure is actively eliminated.
More specifically, each service condition and each parameter threshold specifically could be provided as in above-mentioned steps (3), run item
Part：Environment temperature is 10 DEG C~40 DEG C, and each work site is in fully loaded lower work, and the clamping of each work site is loosened, under upper top
The operating frequencies such as draw to use maximum actuation frequency, hydraulic system pressure 8MPa, flow rate of hydraulic system 5L/min, hydraulic oil is
No. 46 antiwear hydraulic oils, volume of fuel tank 230L；The setting of parameter threshold：Load deadline t2sIt is set as 720h, mean failure rate
Interval time threshold value MTBFsIt is set as 100h or fault-rate threshold λsIt is set as 1%.
The hydraulic system initial failure active removing method of the present invention is by on-line checking hydraulic system early stage operation rank
The operating parameter of section predicts incipient fault, and counter-measure is then taken to eliminate incipient fault.This method will examine qualified hydraulic pressure
System debug is good, by the operating parameter under on-line checking shutdown status, no-load running state and full-load run state, and will inspection
The operating parameter measured is compared with corresponding threshold value, judges that hydraulic system whether there is incipient fault；If it is determined that liquid
There are incipient faults for pressure system, then before failure occurs or develops into catastrophe failure, pass through fault detect, fault location, event
Phragma from the step of, analyze incipient fault the reason of, then take counter-measure eliminate failure, realization actively eliminate hydraulic system
The purpose of failure；And it is for statistical analysis to hydraulic system historical failure data, it sets hydraulic system unloaded deadline and adds
Carry cut-off condition (early fault period) so that its failure is eliminated in hydraulic system early fault period.It can be pre- by this method
Incipient fault information is timely feedbacked to repair and is safeguarded by the incipient fault for measuring hydraulic system operation early stage (Frequent Troubles phase)
Personnel, reasonable arrangement time and the elimination failure that takes measures, improve hydraulic system runnability and reliability, reduce hydraulic system
Operating cost promotes reliability of the numerically-controlled machine tool complete machine in operation early stage, shortens numerically-controlled machine tool early fault period.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not limitation, all essences in the present invention with the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (3)
1. a kind of hydraulic system initial failure active removing method is included in after finding hydraulic system initial failure, then to early stage
The step of failure is eliminated；It is characterized in that, before being eliminated to initial failure, first liquid is actively discovered using following steps
The initial failure of pressure system：
A, according to the historical data of the numerically-controlled machine tool initial failure with model, early fault period time t2 is obtaineds, numerically-controlled machine tool
Average time between failures MTBFsOr failure rate λs；Historical data when occurring initial failure according to numerically-controlled machine tool simultaneously determines
The threshold value of following parameters：Fluid level threshold Ls, oil liquid temperature threshold value Ts, fluid granule number threshold valueReturn filter particle
Number threshold valueHydraulic system pressure threshold value Ps, flow rate of hydraulic system threshold value Qs, liquid level change rate threshold value VLs, rate of temperature change threshold
Value VTs, fluid granule number change rate threshold valueReturn filter granule number change rate threshold valuePressure change rate threshold value
VPs, flow change rate threshold value VQs；
B, the hydraulic system of failure to be canceled is installed into numerically-controlled machine tool, has debugged the functional status of numerically-controlled machine tool, ensure number
Control lathe can be correctly completed all feature operations；
C, start hydraulic system is made its each operating point be in full load condition, is waited for liquid with maximum actuation frequency operating numerical control lathe
After pressure system steady operation, the liquid level L of continuous on-line detection fluid2, the temperature T of continuous on-line detection fluid2, continuous online inspection
Survey fluid granule numberContinuous on-line detection return oil filter granule numberContinuous on-line detection hydraulic system pressure P2, even
Continuous on-line checking flow rate of hydraulic system Q2, by continuous on-line detection to above-mentioned parameter be real-time transmitted on computer, calculate each
Parameter changes with time rate：Liquid level change rate VL2, rate of temperature change VT2, fluid granule number change rateReturn filter
Granule number change ratePressure change rate VP2, flow change rate VQ2；In early fault period time t2sIt is interior, by above-mentioned parameter point
Not corresponding given threshold is compared, and any parameter is more than its corresponding given threshold, and average time between failures
MTBF < MTBFsOr λ > λs；Then indicate the initial failure of discovery hydraulic system.
2. hydraulic system initial failure active removing method as described in claim 1, which is characterized in that before carrying out step C,
Further include being actively discovered to the initial failure of hydraulic system in the unloaded state, and the step of being eliminated, to hydraulic pressure system
The step of initial failure of system in the unloaded state is actively discovered is as follows：Start hydraulic system, ensures each of numerically-controlled machine tool
Work site is in relaxation state, after hydraulic system steady operation, the liquid level L of continuous on-line detection fluid1, continuous online
Detect the temperature T of fluid1, continuous on-line detection fluid granule numberContinuous on-line detection return oil filter granule numberEven
Continuous on-line checking hydraulic system pressure P1, continuous on-line detection flow rate of hydraulic system Q1；The above-mentioned parameter that continuous on-line detection is arrived
It is real-time transmitted on computer, calculates each parameter and change with time rate, liquid level change rate VL1, rate of temperature change VT1, fluid
Grain number change rateReturn filter granule number change ratePressure change rate VP1, flow change rate VQ1；It is cut in zero load
Only time t1sIt is interior；By above-mentioned parameter, corresponding given threshold is compared respectively, and any parameter is more than its corresponding setting
Threshold value, then it represents that find the initial failure of hydraulic system in the unloaded state.
3. hydraulic system initial failure active removing method as claimed in claim 2, which is characterized in that exist to hydraulic system
Further include to hydraulic system in shutdown status before the step of initial failure under shutdown status is actively discovered and eliminated
Under initial failure the step of being actively discovered and being eliminated, initial failure of the hydraulic system under shutdown status is carried out
The step of actively discovering is as follows：Under shutdown status, the liquid level L of fluid is detected one by one0, detect the temperature T of fluid0, detect fluid
Granule numberDetect return oil filter granule numberAnd corresponding given threshold is compared respectively, once it is more than it
Corresponding given threshold, then it represents that find initial failure of the hydraulic system under shutdown status.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111795143A (en) * | 2019-04-03 | 2020-10-20 | 奥迪股份公司 | Method for operating a hydraulic valve of a motor vehicle transmission and motor vehicle transmission |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111795143A (en) * | 2019-04-03 | 2020-10-20 | 奥迪股份公司 | Method for operating a hydraulic valve of a motor vehicle transmission and motor vehicle transmission |
| CN111795143B (en) * | 2019-04-03 | 2021-11-23 | 奥迪股份公司 | Method for operating a hydraulic valve of a motor vehicle transmission and motor vehicle transmission |
| US11542965B2 (en) | 2019-04-03 | 2023-01-03 | Audi Ag | Method for operating a hydraulic valve of a hydraulic device of a motor vehicle transmission device as well as a motor vehicle transmission device |
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| CN108757643B (en) | 2019-09-27 |
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