CN104501997A - Clutch temperature detection method and system for wet-type double-clutch automatic gearbox - Google Patents
Clutch temperature detection method and system for wet-type double-clutch automatic gearbox Download PDFInfo
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- CN104501997A CN104501997A CN201410706437.7A CN201410706437A CN104501997A CN 104501997 A CN104501997 A CN 104501997A CN 201410706437 A CN201410706437 A CN 201410706437A CN 104501997 A CN104501997 A CN 104501997A
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Abstract
The invention discloses a clutch temperature detection method and system for a wet-type double-clutch automatic gearbox, and belongs to the technical field of automobiles. The method comprises the following steps: detecting a circuit where a temperature sensor is located and judging whether a fault happens to the circuit or not according to detection results; detecting the temperature of a clutch through the temperature sensor if there is no fault happening to the circuit, and judging whether the temperature of the clutch is reliable or not; and employing a temperature model to calculate the temperature of the clutch if the temperature of the clutch is reliable. According to the method, the temperature model can be employed to calculate the temperature of the clutch under the condition that the temperature information, detected by the temperature sensor, is not reliable, thereby guaranteeing the accurate and reliable temperature information of the clutch.
Description
Technical field
The present invention relates to automobile technical field, particularly a kind of clutch temp detection method of wet-type double-clutch automatic speed-change case and system.
Background technology
The gearing of typical wet-type double-clutch automatic speed-change case, by two coaxial nested or clutch couplinges of being arranged in parallel, coaxially, two input shafts of inside and outside nested arrangement, two output shafts be arranged in parallel, be arranged in the multiple synchromesh gears on output shaft, multiple selector fork, and a differential mechanism composition.Variator odd, even number gear input gear is arranged on two input shafts, by switching and the different synchronizer action of two clutch couplinges, realizes torque conversion and output via different output shaft.Complete in wheel box control procedure, need to monitor in real time the temperature of the clutch coupling in wet-type double-clutch automatic speed-change case.
In prior art, usually at the oil-out mounting temperature sensor of clutch coupling, carry out clutch temp detection, but when temperature sensor breaks down, easily cause detected temperature information unreliable.When clutch temp is too high, easily cause clutch mechanism they deteriorate, thus cannot control automatic gear-box.
Summary of the invention
Embodiments provide a kind of clutch temp detection method and system of wet-type double-clutch automatic speed-change case, in the insecure situation of temperature information that temperature sensor detects, temperature model can be adopted to calculate the temperature of clutch coupling, thus ensure that clutch temp information accurately, reliably.
The technical scheme that the embodiment of the present invention provides is as follows:
On the one hand, provide a kind of clutch temp detection method of wet-type double-clutch automatic speed-change case, comprising:
Temperature sensor place circuit is detected, and judges whether described circuit exists fault according to testing result;
If not, then detected the temperature of clutch coupling by temperature sensor, and judge that whether the temperature of described clutch coupling is reliable;
If not, then temperature model is adopted to calculate the temperature of described clutch coupling.
Preferably, also comprise: judging that the temperature of described clutch coupling can rearward, stop adopting described temperature model to calculate the temperature of described clutch coupling, the temperature detected by described temperature sensor is as the temperature of described clutch coupling.
Preferably, whether the described temperature judging described clutch coupling is reliable, comprising: judge that the temperature of described clutch coupling is whether in preset temperature range, if not, then judges that the temperature of described clutch coupling is unreliable.
Preferably, if the temperature of described clutch coupling is in preset temperature range, also comprise: judge whether the rate of temperature change of described clutch coupling exceedes preset temperature rate of change, if so, then judge that the temperature of described clutch coupling is unreliable.
Preferably, before employing temperature model calculates the temperature of described clutch coupling, also comprise: whether reliably verify described temperature model, if so, then adopt described temperature model to calculate the temperature of described clutch coupling.
On the other hand, provide a kind of clutch temp detection system of wet-type double-clutch automatic speed-change case, comprising:
Detection module, for detecting temperature sensor place circuit;
First judge module, for judging according to the testing result of described detection module whether described temperature sensor place circuit exists fault;
Temperature sensor, for judging that described circuit is not deposited after a failure at described first judge module, detects the temperature of clutch coupling;
Second judge module, whether the temperature for the described clutch coupling detected described temperature sensor reliably judges;
Computing module, after judging that at described second judge module the temperature of the described clutch coupling that described temperature sensor detects is unreliable, adopts temperature model to calculate the temperature of described clutch coupling.
Preferably, also comprise: control module, for judging that at described second judge module the temperature of described clutch coupling can rearward, stop adopting described temperature model to calculate the temperature of described clutch coupling, the temperature detected by described temperature sensor is as the temperature of described clutch coupling.
Preferably, described second judge module comprises: the first judging unit, for judging that the temperature of described clutch coupling is whether in preset temperature range, if not, then judges that the temperature of described clutch coupling is unreliable.
Preferably, described second judge module also comprises: the second judging unit, for after described first judging unit judges that the temperature of described clutch coupling is in preset temperature range, judge whether the rate of temperature change of described clutch coupling exceedes preset temperature rate of change, if so, then judge that the temperature of described clutch coupling is unreliable.
Preferably, also comprise: correction verification module, before calculating the temperature of described clutch coupling at employing temperature model, whether reliably verify described temperature model, if so, then adopt described temperature model to calculate the temperature of described clutch coupling.
The clutch temp detection method of the wet-type double-clutch automatic speed-change case that the embodiment of the present invention provides and system, the temperature of clutch coupling is detected by temperature sensor, and judging in the insecure situation of the temperature of clutch coupling, temperature model is adopted to calculate the temperature of clutch coupling, adopt the temperature that the temperature calculated replaces temperature sensor to detect, thus the clutch temp information that guarantee obtains accurately and reliably, can effectively prevent clutch temp too high and damage mechanical part, when temperature sensor breaks down, still can control effectively to automatic gear-box.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the present invention, for those of ordinary skill in the art, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the process flow diagram of the clutch temp detection method of a kind of wet-type double-clutch automatic speed-change case that the embodiment of the present invention provides;
Fig. 2 is the TCU interface circuit schematic diagram that the embodiment of the present invention provides;
Fig. 3 is the process flow diagram of the clutch temp detection method of the second wet-type double-clutch automatic speed-change case that the embodiment of the present invention provides;
Fig. 4 is the process flow diagram of the clutch temp detection method of the third wet-type double-clutch automatic speed-change case that the embodiment of the present invention provides;
Fig. 5 is the process flow diagram of the clutch temp detection method of the 4th kind of wet-type double-clutch automatic speed-change case that the embodiment of the present invention provides;
Fig. 6 is the process flow diagram of the clutch temp detection method of the 5th kind of wet-type double-clutch automatic speed-change case that the embodiment of the present invention provides;
Fig. 7 is the structural representation of the clutch temp detection system of a kind of wet-type double-clutch automatic speed-change case that the embodiment of the present invention provides;
Fig. 8 is the structural representation of the clutch temp detection system of the second wet-type double-clutch automatic speed-change case that the embodiment of the present invention provides;
Fig. 9 is the structural representation of the clutch temp detection system of the third wet-type double-clutch automatic speed-change case that the embodiment of the present invention provides;
Figure 10 is the structural representation of the clutch temp detection system of the 4th kind of wet-type double-clutch automatic speed-change case that the embodiment of the present invention provides;
Figure 11 is the structural representation of the clutch temp detection system of the 5th kind of wet-type double-clutch automatic speed-change case that the embodiment of the present invention provides.
Embodiment
In order to the scheme making those skilled in the art person understand the embodiment of the present invention better, below in conjunction with drawings and embodiments, the embodiment of the present invention is described in further detail.
Embodiments provide a kind of clutch temp detection method of wet-type double-clutch automatic speed-change case, as shown in Figure 1, comprise the following steps:
Step 101: temperature sensor place circuit is detected.
Specifically, by TCU (Transmission Control Unit, automatic gear-box control module) bottom diagnostic routine, temperature sensor place circuit is detected, to find whether there is the fault such as short circuit, open circuit.
Step 102: judge whether described circuit exists fault according to testing result.
As shown in Figure 2, TCU inside provides 5V voltage by Vcc, and temperature sensor resistance value is R, and divider resistance resistance is R
l, signal wire output voltage is under normal circumstances: Vcc/ (R
l+ R); When signal wire and earth short, then signal wire output voltage is: Vcc/R
l; When there is open circuit, signal wire is unsettled, and output voltage is infinitely great; When signal wire is shorted to 5V voltage, output signal is 5V; TCU, by detecting voltage swing, can judge whether temperature sensor place circuit exists fault, at least can judge to be shorted to ground, to be shorted to electricity and several fault of open circuit.
When judging to there is fault by step 102, will jump to corresponding fault mode, reminding user eliminates fault.If judge to there is not fault by step 102, then perform step 103: the temperature being detected clutch coupling by temperature sensor, then perform step 104: judge that whether the temperature of clutch coupling is reliable.
As shown in Figure 4, judge that the temperature of clutch coupling is whether reliable, can step 201 be comprised: judge that the temperature of clutch coupling is whether in preset temperature range, if not, then judges that the temperature of clutch coupling is unreliable.
Specifically, a temperature range (preset temperature range) can be pre-set according to the operating temperature range of clutch coupling, when temperature sensor detects that the temperature of clutch coupling is in this preset temperature range, tentatively think that the temperature of detected clutch coupling is reliable; On the contrary, if the temperature detected is not in this preset temperature range, then thinks that the temperature of clutch coupling is unreliable, need the true temperature determining clutch coupling further.
In order to whether reliably judge the temperature of clutch coupling further, as shown in Figure 5, after judging that the temperature of clutch coupling is in preset temperature range by step 201, also comprise step 202: judge whether the rate of temperature change of clutch coupling exceedes preset temperature rate of change, if so, then judge that the temperature of clutch coupling is unreliable; Otherwise, through judging that rate of temperature change does not exceed preset temperature rate of change, then judge that the temperature of clutch coupling is reliable.
Because TCU is when carrying out signals collecting, signals collecting can be carried out with fixed sampling frequency, such as, every 10ms can detect a temperature, record rate of temperature change, wherein, rate of temperature change referred to the ratio of the temperature that this temperature gathered and a upper sampling period collect simultaneously.Specifically can pre-set a rate of temperature change (preset temperature rate of change) according to the precision of temperature sensor and actual needs, if through judging that rate of temperature change does not exceed preset temperature rate of change, then judge that the temperature of clutch coupling is reliable, this clutch temp can be adopted to carry out the control of automatic gear-box; And when detecting that rate of temperature change exceedes preset temperature rate of change, then think that the temperature of clutch coupling there occurs saltus step, because the temperature of clutch coupling under normal circumstances saltus step can not occur, can think that the clutch temp that temperature sensor gathers is unreliable, need to adopt other modes to obtain clutch temp value, to substitute insecure temperature value.
As shown in Figure 5, after judging that clutch temp is unreliable, perform step 105: adopt temperature model to calculate the temperature of clutch coupling.
In embodiments of the present invention, when building temperature model, need wheel box integrally to consider, the parts of existing generation heat in wheel box, also there is thermal component, by producing after heat that the parts of heat produce deducts the heat that thermal component distributes, easily calculating temperature change value.Wherein, the parts producing heat in wheel box have: double clutch, bearing, solenoid valve, synchronizer, engine cooling water (when cooling water temperature is higher than gearbox lubrication oil temperature), axle system etc.; In wheel box, the parts of distribute heat have: the housing contacted with air, refrigeratory, engine cooling water (when cooling water temperature is lower than gearbox lubrication oil temperature).The signal gathered is needed to have in temperature model building process: engine cooling water temperature, Engine Inlet Temperature signal, gear box oil sump temperature signal, engine speed, clutch rotational speed, inside/outside input shaft rotating speed, output shaft rotating speed and wheel box cooling valve opening signal, wherein, wheel box cooling valve is for controlling to the cutting oil uninterrupted of clutch coupling.After collecting above-mentioned signal, then in conjunction with the specific heat capacity of clutch coupling material, the contact area between material, according to law of conservation of energy, can build clutch coupling intensification computing formula, thus construct temperature model.
Specifically, after vehicle powers on, according to the oil sump temperature signal of the wheel box that gear box control unit gathers, judge the temperature of current oil drain pan, detect engine cooling water signal simultaneously, judge the temperature of present engine chilled water; When after engine ignition, also intake air temperature signals can be read, after collection oil sump temperature signal, using the basic value of current oil sump temperature as wheel box fluid, in wheel box operational process, according to the friction factor of clutch friction material, by clutch fluid compressing cylinder to the contact area of clutch surface applied pressure, double clutch friction material, speed discrepancy between clutch driving plate and clutch plate, carry out the calculating of work of slipping, thus draw the heat that clutch coupling produces in operational process.
Because clutch coupling cutting oil can take away partial heat in the process flowing through clutch coupling, the lubricating oil of oil sump is drawn onto in hydraulic circuit by oil pump, controlled by the aperture cooling valve, the uninterrupted of thermal component to the liquid coolant of clutch coupling can be drawn, according to the heat radiation power of thermal component, the oil temperature of the cutting oil outputting to clutch coupling can be calculated.Concrete computation process is: the flow Q of engine cooling water, the specific heat capacity C of engine cooling water, the size of heat interchange is judged according to the heat radiation power of thermal component, thus obtain unit volume dispersed heat, thus obtain being input to the temperature of cutting oil on clutch coupling, the amount flowing through the cutting oil of clutch coupling can be obtained by the aperture size cooling valve, heat is walked because the lubricating oil flowing through thermal component can all flow through clutch band, therefore, the heat that clutch coupling produces can be adopted, in units of the time, calculate the temperature of the current fluid thrown away from clutch coupling, temperature model constructed by utilization, clutch temp can be calculated.
As shown in Figure 3, calculate in the process of clutch temp adopting temperature model, continue through the temperature that temperature sensor detects clutch coupling, and perform step 106: judge that whether the temperature of clutch coupling is reliable, judging that the temperature of the clutch coupling that temperature sensor gathers can be rearward, perform step 107: stop adopting temperature model to calculate the temperature of clutch coupling, the temperature detected by temperature sensor is as the temperature of clutch coupling.
Wherein, step 106: judge that the temperature of clutch coupling is whether reliable, comprise step 301: judge that the temperature of clutch coupling is whether in preset temperature range, if so, then tentatively judges that the temperature of clutch coupling is reliable; If not, then judge that the temperature of clutch coupling is unreliable.Judged that by step 301 temperature of clutch coupling rearward, can pass through step 302 further: judge whether the rate of temperature change of clutch coupling exceedes preset temperature rate of change, judge that whether the temperature of clutch coupling is reliable.If rate of temperature change exceedes preset temperature rate of change, then judge that the temperature of clutch coupling is unreliable; If rate of temperature change does not exceed preset temperature rate of change, then judge that the temperature of clutch coupling is reliable.
Because temperature sensor may occur short trouble, this fault may can be eliminated within a short period of time, therefore, after generation short trouble situation, need not think the clutch temp unreliable information that temperature sensor detects always, and adopt temperature model to carry out clutch temp calculating.In embodiments of the present invention, after adopting temperature model to calculate clutch temp, continue to adopt temperature sensor to detect the temperature of clutch coupling, and judging in the reliable situation of clutch temp information, automatically the temperature detected by temperature sensor switches to clutch temp to use, can when temperature sensor breaks down, interim employing temperature model calculates clutch temp temperature as an alternative, the temperature information preventing temperature sensor from detecting is unreliable, and judging that the temperature information that temperature sensor detects can be rearward, automatically be that clutch temp uses by this temperature return, stop the calculating of clutch temp, thus double counting work can be reduced.
As shown in Figure 6, before employing temperature model calculates the temperature of described clutch coupling, also comprise step 401: whether verification temperature model is reliable, if so, then adopt temperature model to calculate the temperature of clutch coupling.
According to the related description of overhead temperature model construction, the structure of temperature model depends on the collection of a large amount of physical signalling, due to the complicacy of actual condition, easily cause going wrong in certain or some signal acquisition process, thus cause temperature model itself to depart from actual conditions, and then the clutch temp information causing adopting this temperature model to calculate is also unreliable, therefore, need to increase checking procedure, to judge that whether temperature model is reliable.
In embodiments of the present invention, whether checking procedure mainly comprises and accurately verifying gathered physical signalling itself, such as, the signals such as input shaft rotating speed, the outer input shaft rotating speed of wheel box, cooling valve opening size in engine speed, engine torque, car load vehicle speed signal, engine cooling water temperature, fan swicth signal, gear box oil sump temperature signal, wheel box input speed, wheel box are verified.The verification of these signals is mainly adopted and obtains signal by different approach and to compare realization, such as, the data read by CAN are compared with the data gathered by sensor, thus judge that whether these physical quantity informations are reliable, those skilled in the art easily set concrete comparison rules and then realize verification, do not repeat them here.If do not had problems through verifying the physical quantity inputted, then thinking reliable based on the temperature model constructed by these physical quantitys, this temperature model can be utilized to calculate the temperature of clutch coupling.If find through verification to have problems in the physical quantity of input, then think that temperature model is unreliable, now, the clutch temp information gathered due to temperature sensor can not be adopted, temperature model can not be adopted to carry out the calculating of clutch temp, can jump to fault model by program setting, thus reminding user is fixed a breakdown in time.
The clutch temp detection method of the wet-type double-clutch automatic speed-change case that the embodiment of the present invention provides, the temperature of clutch coupling is detected by temperature sensor, and judging in the insecure situation of the temperature of clutch coupling, temperature model is adopted to calculate the temperature of clutch coupling, adopt the temperature that the temperature calculated replaces temperature sensor to detect, thus the clutch temp information that guarantee obtains accurately and reliably, can effectively prevent clutch temp too high and damage mechanical part, when temperature sensor breaks down, still can control effectively to automatic gear-box.
Correspondingly, the embodiment of the present invention additionally provides a kind of clutch temp detection system of wet-type double-clutch automatic speed-change case, as shown in Figure 7, comprising:
Detection module 501, for detecting temperature sensor 503 place circuit;
First judge module 502, for judging according to the testing result of detection module 501 whether temperature sensor place circuit exists fault;
Temperature sensor 503, for judging that described circuit is not deposited after a failure at the first judge module 502, detects the temperature of clutch coupling;
Second judge module 504, whether the temperature for the clutch coupling detected temperature sensor 503 reliably judges;
Computing module 505, after judging that the temperature of the clutch coupling that temperature sensor 503 detects is unreliable at the second judge module 504, adopts temperature model to calculate the temperature of clutch coupling.
As shown in Figure 8, the clutch temp detection system of above-mentioned wet-type double-clutch automatic speed-change case, also comprises:
Control module 506, for judging that at the second judge module 504 temperature of clutch coupling can rearward, stop adopting temperature model to calculate the temperature of clutch coupling, the temperature detected by temperature sensor 503 is as the temperature of clutch coupling.
As shown in Figure 9, above-mentioned second judge module 504 comprises:
First judging unit 601, for judging that the temperature of clutch coupling is whether in preset temperature range, if not, then judges that the temperature of clutch coupling is unreliable.
As shown in Figure 10, above-mentioned second judge module 504 also comprises:
Second judging unit 602, for after the first judging unit 601 judges that the temperature of clutch coupling is in preset temperature range, judges whether the rate of temperature change of clutch coupling exceedes preset temperature rate of change, if not, then judges that the temperature of clutch coupling is unreliable.
As shown in figure 11, the clutch temp detection system of above-mentioned wet-type double-clutch automatic speed-change case, also comprises:
Correction verification module 701, for before the temperature adopting temperature model calculating clutch coupling, whether verification temperature model is reliable, if so, then adopts temperature model to calculate the temperature of clutch coupling.
The clutch temp detection system of the wet-type double-clutch automatic speed-change case that the embodiment of the present invention provides, the temperature of clutch coupling is detected by temperature sensor, and judging in the insecure situation of the temperature of clutch coupling, temperature model is adopted to calculate the temperature of clutch coupling, adopt the temperature that the temperature calculated replaces temperature sensor to detect, thus the clutch temp information that guarantee obtains accurately and reliably, can effectively prevent clutch temp too high and damage mechanical part, when temperature sensor breaks down, still can control effectively to automatic gear-box.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a clutch temp detection method for wet-type double-clutch automatic speed-change case, is characterized in that, comprising:
Temperature sensor place circuit is detected, and judges whether described circuit exists fault according to testing result;
If not, then detected the temperature of clutch coupling by temperature sensor, and judge that whether the temperature of described clutch coupling is reliable;
If not, then temperature model is adopted to calculate the temperature of described clutch coupling.
2. the clutch temp detection method of wet-type double-clutch automatic speed-change case according to claim 1, it is characterized in that, also comprise: judging that the temperature of described clutch coupling can be rearward, stop adopting described temperature model to calculate the temperature of described clutch coupling, the temperature detected by described temperature sensor is as the temperature of described clutch coupling.
3. the clutch temp detection method of wet-type double-clutch automatic speed-change case according to claim 2, it is characterized in that, describedly judge that whether the temperature of described clutch coupling is reliable, comprise: judge that the temperature of described clutch coupling is whether in preset temperature range, if not, then judge that the temperature of described clutch coupling is unreliable.
4. the clutch temp detection method of wet-type double-clutch automatic speed-change case according to claim 3, it is characterized in that, if the temperature of described clutch coupling is in preset temperature range, also comprise: judge whether the rate of temperature change of described clutch coupling exceedes preset temperature rate of change, if so, then judge that the temperature of described clutch coupling is unreliable.
5. the clutch temp detection method of wet-type double-clutch automatic speed-change case according to claim 4, it is characterized in that, before employing temperature model calculates the temperature of described clutch coupling, also comprise: whether reliably verify described temperature model, if so, then described temperature model is adopted to calculate the temperature of described clutch coupling.
6. a clutch temp detection system for wet-type double-clutch automatic speed-change case, is characterized in that, comprising:
Detection module, for detecting temperature sensor place circuit;
First judge module, for judging according to the testing result of described detection module whether described temperature sensor place circuit exists fault;
Temperature sensor, for judging that described circuit is not deposited after a failure at described first judge module, detects the temperature of clutch coupling;
Second judge module, whether the temperature for the described clutch coupling detected described temperature sensor reliably judges;
Computing module, after judging that at described second judge module the temperature of the described clutch coupling that described temperature sensor detects is unreliable, adopts temperature model to calculate the temperature of described clutch coupling.
7. the clutch temp detection system of wet-type double-clutch automatic speed-change case according to claim 6, is characterized in that, also comprise:
Control module, for judging that at described second judge module the temperature of described clutch coupling can rearward, stop adopting described temperature model to calculate the temperature of described clutch coupling, the temperature detected by described temperature sensor is as the temperature of described clutch coupling.
8. the clutch temp detection system of wet-type double-clutch automatic speed-change case according to claim 7, is characterized in that, described second judge module comprises:
First judging unit, for judging that the temperature of described clutch coupling is whether in preset temperature range, if not, then judges that the temperature of described clutch coupling is unreliable.
9. the clutch temp detection system of wet-type double-clutch automatic speed-change case according to claim 8, is characterized in that, described second judge module also comprises:
Second judging unit, for after described first judging unit judges that the temperature of described clutch coupling is in preset temperature range, judge whether the rate of temperature change of described clutch coupling exceedes preset temperature rate of change, if so, then judge that the temperature of described clutch coupling is unreliable.
10. the clutch temp detection system of wet-type double-clutch automatic speed-change case according to claim 9, is characterized in that, also comprise:
Whether reliable correction verification module, before calculating the temperature of described clutch coupling at employing temperature model, verify described temperature model, if so, then adopt described temperature model to calculate the temperature of described clutch coupling.
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