CN104458239A - Stuck-open fault detection method and device for hydraulic torque converter - Google Patents
Stuck-open fault detection method and device for hydraulic torque converter Download PDFInfo
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- CN104458239A CN104458239A CN201410788122.1A CN201410788122A CN104458239A CN 104458239 A CN104458239 A CN 104458239A CN 201410788122 A CN201410788122 A CN 201410788122A CN 104458239 A CN104458239 A CN 104458239A
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Abstract
The invention discloses a stuck-open fault detection method for a hydraulic torque converter. The method includes the steps of judging whether a gearbox enters a limp home mode or not, judging whether the hydraulic torque converter is in the locked state or not and whether the slip value of the hydraulic torque converter is larger than the slip threshold value or not when the gearbox does not enter the limp home mode, and determining that the stuck-open fault exists in the hydraulic torque converter and sending a hydraulic torque converter starting command to the hydraulic torque converter when the judgment result shows that the hydraulic torque converter is in the locked state and the slip value of the hydraulic torque converter is larger than the slip threshold value. According to the method, whether the gearbox enters the limp home mode or not is judged first, whether the stuck-open fault exists in the hydraulic torque converter or not is determined through the locking state of the hydraulic torque converter and the slip value of the hydraulic torque converter under the condition that the hydraulic torque converter does not enter the limp home state, the detection process is simple, and the detection result is accurate. In addition, the invention further discloses a corresponding stuck-open fault detection device for the hydraulic torque converter.
Description
Technical field
The present invention relates to fault diagnosis field, particularly relate to a kind of fluid torque-converter and often open fault detection method and fluid torque-converter often leaves failure detector.
Background technology
Fluid torque-converter is the link between the engine of automatic catch automobile and wheel box, is actuating medium with hydraulic oil, make between engine and wheel box be connected to become nonrigid, to facilitate gearbox gear-shift.The effect of fluid torque-converter is transmitting torque, bending moment, speed change and clutch.Therefore, fluid torque-converter plays vital effect in whole gearbox gear-shift process.
Fluid torque-converter generally includes housing, guide wheel, turbine and pump impeller etc.Fluid torque-converter has two states in practical work process, and one is blocking, and one is released state.Under normal circumstances, when fluid torque-converter is when being in blocking, its engine and the transmission of wheel box direct mechanical, now, still there is difference in the pump impeller rotating speed of fluid torque-converter and secondary speed, i.e. slippery difference, but this slippery difference is usually less.When fluid torque-converter is at released state, engine and wheel box are hydrodynamic drive, and the pump impeller rotating speed of fluid torque-converter and secondary speed allow to exist comparatively large-slip value.
In actual moving process, fluid torque-converter may occur often opening fault, if fluid torque-converter is in for a long time often open fault, fluid torque-converter can be caused to damage, even cause vehicle normally not run.Therefore, in car running process, need to detect at any time fluid torque-converter whether exist and often open fault, and take corresponding safeguard measure.
Summary of the invention
The object of this invention is to provide a kind of fluid torque-converter and often open fault detection method, whether there is fault for detecting fluid torque-converter, and take corresponding measure.In addition, the present invention is also supplied to a kind of fluid torque-converter corresponding with the method and often opens failure detector.
For solving the problems of the technologies described above, the invention provides a kind of fluid torque-converter and often opening fault detection method, comprising:
Judge whether wheel box enters limp-home mode;
When described wheel box does not enter limp-home mode, judge whether fluid torque-converter is in blocking and whether the slippery difference of described fluid torque-converter is greater than slippage threshold value;
When judged result characterize described fluid torque-converter be in blocking and the slippery difference of described fluid torque-converter is greater than described slippage threshold value time, determine that described fluid torque-converter exists and often open fault, and send fluid torque-converter to described fluid torque-converter and open order.
Preferably, describedly judge whether wheel box enters limp-home mode and comprise:
Obtain the safeguard measure parameter of wheel box current state;
Judge whether the safeguard measure parameter of described wheel box current state equals 1;
When the safeguard measure parameter of described wheel box current state equals 1, determine that described wheel box enters limp-home mode; Otherwise, determine that described wheel box does not enter limp-home mode.
Preferably, describedly judge whether the slippery difference of fluid torque-converter is greater than slippage threshold value and comprises:
Obtain the rotating speed of engine and the rotating speed of transformer turbine;
The slippery difference of fluid torque-converter is calculated according to the rotating speed of described engine and the rotating speed of described transformer turbine;
The slippery difference of more described fluid torque-converter and the size of described slippage threshold value.
Preferably, describedly judge whether fluid torque-converter is in blocking and comprises:
Obtain described fluid torque-converter electromagnetic valve current value;
Judge whether described fluid torque-converter electromagnetic valve current value reaches the minimum essential requirement current value of converter lockout state;
When described fluid torque-converter electromagnetic valve current value reaches the minimum essential requirement current value of described converter lockout state, determine that described fluid torque-converter is in blocking; Otherwise, determine that described fluid torque-converter is not in blocking.
A kind of fluid torque-converter often opens failure detector, comprising:
Limp-home mode judging unit, for judging whether wheel box enters limp-home mode;
Often open breakdown judge unit, for when described wheel box does not enter limp-home mode, judge whether fluid torque-converter is in blocking and whether the slippery difference of described fluid torque-converter is greater than slippage threshold value;
Control module, for characterize when judged result described fluid torque-converter be in blocking and the slippery difference of described fluid torque-converter is greater than described slippage threshold value time, determine that described fluid torque-converter exists and often open fault, and open order to described fluid torque-converter transmission fluid torque-converter.
Preferably, described limp-home mode judging unit comprises:
Limp-home mode obtains subelement, for obtaining the safeguard measure parameter of wheel box current state;
Limp-home mode judgment sub-unit, for judging whether the safeguard measure parameter of described wheel box current state equals 1;
Limp-home mode determination subelement, for when the safeguard measure parameter of described wheel box current state equals 1, determines that described wheel box enters limp-home mode; Otherwise, determine that described wheel box does not enter limp-home mode.
Preferably, described breakdown judge unit of often opening comprises:
Slippery difference obtains subelement, for the rotating speed of the rotating speed and transformer turbine that obtain engine;
Slippery difference computation subunit, for calculating the slippery difference of fluid torque-converter according to the rotating speed of described engine and the rotating speed of described transformer turbine;
Slippery difference compares subelement, for the slippery difference of more described fluid torque-converter and the size of described slippage threshold value.
Preferably, described breakdown judge unit of often opening also comprises:
Blocking obtains subelement, for obtaining described fluid torque-converter electromagnetic valve current value;
Blocking judgment sub-unit, for judging whether described fluid torque-converter electromagnetic valve current value reaches the minimum essential requirement current value of converter lockout state;
Blocking determination subelement, for when described fluid torque-converter electromagnetic valve current value reaches the minimum essential requirement current value of described converter lockout state, determines that described fluid torque-converter is in blocking; Otherwise, determine that described fluid torque-converter is not in blocking.
Fluid torque-converter provided by the present invention often opens fault detection method, first judge whether wheel box enters limp-home mode, under the prerequisite not entering limp-home mode, carry out follow-up judgement again, when wheel box enters limp-home mode, do not carry out follow-up judgement, be conducive to like this saving detection time.When wheel box does not enter limp-home mode, when fluid torque-converter is in blocking and the slippery difference of fluid torque-converter is greater than slippage threshold value, determines that fluid torque-converter exists and often open fault.This method directly judges the blocking of fluid torque-converter and the slippery difference of fluid torque-converter, and determine whether fluid torque-converter exists with this and often open fault, therefore, testing process is simple, testing result is accurate.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention, simple introduction is done below by the accompanying drawing used required in embodiment, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the process flow diagram that fault detection method often opened by a kind of fluid torque-converter provided by the invention;
Fig. 2 is a kind of process flow diagram whether wheel box enters the method for limp-home mode that judges provided by the invention;
Fig. 3 is a kind of process flow diagram whether slippery difference of fluid torque-converter is greater than the method for slippage threshold value that judges provided by the invention;
Fig. 4 is a kind of process flow diagram whether fluid torque-converter is in the method for blocking that judges provided by the invention;
Fig. 5 is the structural drawing that failure detector often opened by a kind of fluid torque-converter provided by the invention;
Fig. 6 is the structural drawing of a kind of limp-home mode judging unit provided by the invention;
Fig. 7 is a kind of structural drawing often opening breakdown judge unit provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not making under creative work prerequisite, and the every other embodiment obtained, all belongs to scope.
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Core of the present invention is to provide a kind of fluid torque-converter and often opens fault detection method, often opens fault, in addition, also provide a kind of fluid torque-converter based on said method often to open failure detector for what detect fluid torque-converter in automatic catch automobile.
Embodiment one
Fig. 1 is the process flow diagram that fault detection method often opened by a kind of fluid torque-converter provided by the invention.The method comprises the following steps:
S10: judge whether wheel box enters limp-home mode;
Limp-home mode refers to when more serious fault appears in wheel box, ECU (Electrical Control Unit) in control module can cut off solenoid valve immediately, make wheel box enter the limp-home mode of hydrostatic control, automobile keeps in repair by automobile home, James or to neighbouring vehicle repairing factory with limp-home gear.If automobile enters limp-home mode, the power supply of solenoid valve is cut off, the electromagnetic valve current value of the fluid torque-converter collected is also just inaccurate, also just the judgement that fault often left by fluid torque-converter cannot be carried out, therefore, when judging whether that fault is often opened in existence, first judge whether enter limp-home mode when front gear box.
S11: when described wheel box does not enter limp-home mode, judges whether fluid torque-converter is in blocking and whether the slippery difference of described fluid torque-converter is greater than slippage threshold value;
When determining that wheel box does not enter limp-home mode, follow-up deterministic process is just meaningful, namely judges whether fluid torque-converter is in blocking, and judges whether the slippery difference of fluid torque-converter is greater than slippage threshold value.By judging whether fluid torque-converter is in blocking and whether fluid torque-converter is greater than slippage threshold value, further could judge whether fluid torque-converter exists and often opening fault.
S12: when judged result characterize described fluid torque-converter be in blocking and the slippery difference of described fluid torque-converter is greater than described slippage threshold value time, determine that described fluid torque-converter exists and often open fault, and open order to described fluid torque-converter transmission fluid torque-converter.
Through the judgement of above-mentioned steps, when wheel box does not enter limp-home mode, when judged result sign fluid torque-converter is in blocking and the slippery difference of fluid torque-converter is greater than slippage threshold value, namely fluid torque-converter is in blocking, but slippery difference is comparatively large, just determines that fluid torque-converter exists and often open fault.In order to reduce the wearing and tearing of described fluid torque-converter, also needing to send fluid torque-converter to fluid torque-converter simultaneously and opening order.
First the present embodiment judges whether wheel box enters limp-home mode, when wheel box enters limp-home mode, does not carry out follow-up judgement work, saves detection time.In addition, this method directly judges the blocking of fluid torque-converter and slippery difference, and often open fault to determine whether fluid torque-converter exists, therefore, testing process is simple, testing result is accurate.
It should be noted that, in present specification, said slippage threshold value refers to, concrete numerical value, i.e. a preset value in the difference of pump impeller rotating speed and secondary speed, such as, can be set as 40rpm.This value can set according to actual conditions, is not a changeless value.
Fig. 2 is a kind of process flow diagram whether wheel box enters the method for limp-home mode that judges provided by the invention.Describedly judge whether wheel box enters limp-home mode and comprise the following steps:
S20: the safeguard measure parameter obtaining wheel box current state;
Wheel box is made up of fluid torque-converter, planet wheel and hydraulic control system, is reached the effect of speed change by the method for fluid power transmission and gear combination.The normal operation guarantee wheel box of wheel box all parts normally runs, and when certain parts occurs abnormal, control module can take corresponding safeguard measure, to solve abnormal conditions.Under normal circumstances, if automobile normally runs, then the safeguard measure parameter of wheel box is zero; If when wheel box enters limp-home mode, its safeguard measure parameter is 1.Therefore, when judging whether wheel box enters limp-home mode, need the safeguard measure parameter obtaining wheel box current state.
S21: judge whether the safeguard measure parameter of described wheel box current state equals 1;
Limp-home mode is a kind of situation that catastrophic failure appears in wheel box, and when there is this fault, the safeguard measure parameter of wheel box is just 1, characterizes wheel box be in limp-home mode with this.
S22: when the safeguard measure parameter of described wheel box current state equals 1, determine that described wheel box enters limp-home mode;
S23: otherwise, determine that described wheel box does not enter limp-home mode.
By the judgement of last step, if the safeguard measure parameter of wheel box current state equals 1, then determine that wheel box enters limp-home mode; If the safeguard measure parameter of wheel box current state is not 1, then determine that wheel box does not enter limp-home mode.
Whether equal 1 by the safeguard measure parameter of wheel box current state and judge whether wheel box enters limp-home mode, determination methods is simple, does not need additionally to increase step, therefore judges speed.
Fig. 3 is a kind of process flow diagram whether slippery difference of fluid torque-converter is greater than the method for slippage threshold value that judges provided by the invention.Describedly judge whether the slippery difference of fluid torque-converter is greater than slippage threshold value and comprises:
S30: obtain the rotating speed of engine and the rotating speed of transformer turbine;
S31: the slippery difference calculating fluid torque-converter according to the rotating speed of described engine and the rotating speed of described transformer turbine;
Because engine is connected with the pump impeller of fluid torque-converter, the slippery difference of current fluid torque-converter just can be calculated by the step S30 acquisition rotating speed of engine and the rotating speed of transformer turbine.
S32: the slippery difference of more described fluid torque-converter and the size of described slippage threshold value.
The slippery difference calculated according to step S31 and slippage threshold value compare, thus determine to judge whether fluid torque-converter exists larger cunning and rub.
Above-mentionedly judge the method whether slippery difference of fluid torque-converter is greater than slippage threshold value, step is simple, directly.
Fig. 4 is a kind of process flow diagram whether fluid torque-converter is in the method for blocking that judges provided by the invention.Describedly judge whether fluid torque-converter is in blocking and comprises:
S40: obtain described fluid torque-converter electromagnetic valve current value;
Flow through the size of the electric current of fluid torque-converter solenoid valve by adjustment, just can control oil pressure, thus control fluid torque-converter is in blocking or released state.
S41: judge whether described fluid torque-converter electromagnetic valve current value reaches the minimum essential requirement current value of converter lockout state;
In concrete enforcement, by comparing the size of the minimum essential requirement current value of fluid torque-converter electromagnetic valve current value and converter lockout state, could judge whether fluid torque-converter is in blocking.
S42: when described fluid torque-converter electromagnetic valve current value reaches the minimum essential requirement current value of described converter lockout state, determine that described fluid torque-converter is in blocking;
S43: otherwise, determine that described fluid torque-converter is not in blocking.
By last step, if fluid torque-converter electromagnetic valve current value reaches the minimum essential requirement current value of described converter lockout state, just illustrate that fluid torque-converter is in blocking; If fluid torque-converter electromagnetic valve current value does not reach the minimum essential requirement current value of described converter lockout state, just illustrate that fluid torque-converter is not in blocking.
Above-mentionedly judge the method whether fluid torque-converter is in blocking, with fluid torque-converter electromagnetic valve current for breach, judge whether fluid torque-converter is in blocking further, step is simple, quick and precisely can judge the state of fluid torque-converter.
It should be noted that, in the present embodiment, this value of minimum essential requirement current value of converter lockout state can set according to actual conditions, and such as, minimum essential requirement current value can be 850mA.
Embodiment two
Fig. 5 is the structural drawing that failure detector often opened by a kind of fluid torque-converter provided by the invention.Fluid torque-converter often leaves failure detector and comprises: limp-home mode judging unit 50, often open breakdown judge unit 51 and control module 52.
Limp-home mode judging unit 50, for judging whether wheel box enters limp-home mode.
Limp-home mode judging unit 50 is connected with wheel box, for judging whether wheel box enters limp-home mode.
Often open breakdown judge unit 51, for when described wheel box does not enter limp-home mode, judge whether fluid torque-converter is in blocking and whether the slippery difference of described fluid torque-converter is greater than slippage threshold value.
Often open breakdown judge unit 51 to be connected with limp-home mode judging unit 50, when limp-home mode judging unit 50 judges that wheel box does not enter limp-home mode, often open breakdown judge unit 51 and judge whether the slippery difference of fluid torque-converter is greater than slippage threshold value, and judge whether fluid torque-converter is in blocking.
Control module 52, for characterize when judged result described fluid torque-converter be in blocking and the slippery difference of described fluid torque-converter is greater than described slippage threshold value time, determine that described fluid torque-converter exists and often open fault, and open order to described fluid torque-converter transmission fluid torque-converter.
Control module 52 wheel box do not enter limp-home mode and judged result characterize fluid torque-converter be in blocking and the slippery difference of fluid torque-converter is greater than slippage threshold value time, namely fluid torque-converter is in blocking, but slippery difference is comparatively large, just determines that fluid torque-converter exists and often open fault.In order to avoid fluid torque-converter is in fault for a long time, control module 52, when determining that fault is often left in fluid torque-converter existence, sends fluid torque-converter to fluid torque-converter and opens order.
In the present embodiment, limp-home mode judging unit judges whether wheel box enters limp-home mode, and when wheel box enters limp-home mode, other unit, without the need to carrying out follow-up judgement work, save detection time.In addition, this device is not when wheel box enters limp-home mode, directly judge the blocking of fluid torque-converter and the slippery difference of fluid torque-converter, determine whether fluid torque-converter exists with this and often open fault, testing process is simple, testing result is accurate.
Fig. 6 is the structural drawing of a kind of limp-home mode judging unit provided by the invention.Limp-home mode judging unit 50 comprises:
Limp-home mode obtains subelement 500, for obtaining the safeguard measure parameter of wheel box current state;
Limp-home mode judgment sub-unit 501, for judging whether the safeguard measure parameter of described wheel box current state equals 1;
Limp-home mode determination subelement 502, for when the safeguard measure parameter of described wheel box current state equals 1, determines that described wheel box enters limp-home mode; Otherwise, determine that described wheel box does not enter limp-home mode.
Fig. 7 is a kind of structural drawing often opening breakdown judge unit provided by the invention.Often open breakdown judge unit 51 to comprise:
Slippery difference obtains subelement 510, for the rotating speed of the rotating speed and transformer turbine that obtain engine;
Slippery difference computation subunit 511, for calculating the slippery difference of fluid torque-converter according to the rotating speed of described engine and the rotating speed of described transformer turbine;
Slippery difference compares subelement 512, for the slippery difference of more described fluid torque-converter and the size of described slippage threshold value.
Often open breakdown judge unit 51 also to comprise:
Blocking obtains subelement 514, for obtaining described fluid torque-converter electromagnetic valve current value;
Blocking judgment sub-unit 515, for judging whether described fluid torque-converter electromagnetic valve current value reaches the minimum essential requirement current value of converter lockout state;
Blocking determination subelement 516, for when described fluid torque-converter electromagnetic valve current value reaches the minimum essential requirement current value of described converter lockout state, determines that described fluid torque-converter is in blocking; Otherwise, determine that described fluid torque-converter is not in blocking.
Because the present embodiment is device corresponding to the method for embodiment one, only provide the structure between device here, concrete implementation procedure is with reference to the explanation of embodiment one.
Above often fault detection method is opened to fluid torque-converter provided by the present invention and device is described in detail.Apply specific case herein to set forth principle of the present invention and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
Claims (8)
1. fluid torque-converter often leaves a fault detection method, it is characterized in that, comprising:
Judge whether wheel box enters limp-home mode;
When described wheel box does not enter limp-home mode, judge whether fluid torque-converter is in blocking and whether the slippery difference of described fluid torque-converter is greater than slippage threshold value;
When judged result characterize described fluid torque-converter be in blocking and the slippery difference of described fluid torque-converter is greater than described slippage threshold value time, determine that described fluid torque-converter exists and often open fault, and send fluid torque-converter to described fluid torque-converter and open order.
2. method according to claim 1, is characterized in that, describedly judges whether wheel box enters limp-home mode and comprise:
Obtain the safeguard measure parameter of wheel box current state;
Judge whether the safeguard measure parameter of described wheel box current state equals 1;
When the safeguard measure parameter of described wheel box current state equals 1, determine that described wheel box enters limp-home mode; Otherwise, determine that described wheel box does not enter limp-home mode.
3. method according to claim 1, is characterized in that, describedly judges whether the slippery difference of fluid torque-converter is greater than slippage threshold value and comprises:
Obtain the rotating speed of engine and the rotating speed of transformer turbine;
The slippery difference of fluid torque-converter is calculated according to the rotating speed of described engine and the rotating speed of described transformer turbine;
The slippery difference of more described fluid torque-converter and the size of described slippage threshold value.
4. method according to claim 1, is characterized in that, describedly judges whether fluid torque-converter is in blocking and comprises:
Obtain described fluid torque-converter electromagnetic valve current value;
Judge whether described fluid torque-converter electromagnetic valve current value reaches the minimum essential requirement current value of converter lockout state;
When described fluid torque-converter electromagnetic valve current value reaches the minimum essential requirement current value of described converter lockout state, determine that described fluid torque-converter is in blocking; Otherwise, determine that described fluid torque-converter is not in blocking.
5. fluid torque-converter often leaves a failure detector, it is characterized in that, comprising:
Limp-home mode judging unit, for judging whether wheel box enters limp-home mode;
Often open breakdown judge unit, for when described wheel box does not enter limp-home mode, judge whether fluid torque-converter is in blocking and whether the slippery difference of described fluid torque-converter is greater than slippage threshold value;
Control module, for characterize when judged result described fluid torque-converter be in blocking and the slippery difference of described fluid torque-converter is greater than described slippage threshold value time, determine that described fluid torque-converter exists and often open fault, and open order to described fluid torque-converter transmission fluid torque-converter.
6. device according to claim 5, is characterized in that, described limp-home mode judging unit comprises:
Limp-home mode obtains subelement, for obtaining the safeguard measure parameter of wheel box current state;
Limp-home mode judgment sub-unit, for judging whether the safeguard measure parameter of described wheel box current state equals 1;
Limp-home mode determination subelement, for when the safeguard measure parameter of described wheel box current state equals 1, determines that described wheel box enters limp-home mode; Otherwise, determine that described wheel box does not enter limp-home mode.
7. device according to claim 5, is characterized in that, described breakdown judge unit of often opening comprises:
Slippery difference obtains subelement, for the rotating speed of the rotating speed and transformer turbine that obtain engine;
Slippery difference computation subunit, for calculating the slippery difference of fluid torque-converter according to the rotating speed of described engine and the rotating speed of described transformer turbine;
Slippery difference compares subelement, for the slippery difference of more described fluid torque-converter and the size of described slippage threshold value.
8. device according to claim 7, is characterized in that, described breakdown judge unit of often opening also comprises:
Blocking obtains subelement, for obtaining described fluid torque-converter electromagnetic valve current value;
Blocking judgment sub-unit, for judging whether described fluid torque-converter electromagnetic valve current value reaches the minimum essential requirement current value of converter lockout state;
Blocking determination subelement, for when described fluid torque-converter electromagnetic valve current value reaches the minimum essential requirement current value of described converter lockout state, determines that described fluid torque-converter is in blocking; Otherwise, determine that described fluid torque-converter is not in blocking.
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| CN201410788122.1A CN104458239A (en) | 2014-12-17 | 2014-12-17 | Stuck-open fault detection method and device for hydraulic torque converter |
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| CN113092129B (en) * | 2021-03-30 | 2022-10-11 | 盛瑞传动股份有限公司 | Monitoring method for IUPR rate of gearbox |
| CN114607507A (en) * | 2022-03-11 | 2022-06-10 | 中国第一汽车股份有限公司 | Engine rotating speed detection method and device, computer equipment and medium |
| CN114607507B (en) * | 2022-03-11 | 2023-06-02 | 中国第一汽车股份有限公司 | Engine rotating speed detection method and device, computer equipment and medium |
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Application publication date: 20150325 |