CN115596838A - Active diagnostic method and system for main oil pressure system of continuously variable transmission - Google Patents
Active diagnostic method and system for main oil pressure system of continuously variable transmission Download PDFInfo
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 45
- 238000002405 diagnostic procedure Methods 0.000 title claims description 20
- 238000003745 diagnosis Methods 0.000 claims abstract description 51
- 230000007935 neutral effect Effects 0.000 claims abstract description 6
- 230000003213 activating effect Effects 0.000 claims abstract description 4
- 230000001276 controlling effect Effects 0.000 claims description 32
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 abstract description 34
- 238000012360 testing method Methods 0.000 abstract description 17
- 239000003921 oil Substances 0.000 description 212
- 238000010586 diagram Methods 0.000 description 8
- 238000012545 processing Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
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- 230000009977 dual effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/12—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures
- F16H2061/1256—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected
- F16H2061/126—Detecting malfunction or potential malfunction, e.g. fail safe; Circumventing or fixing failures characterised by the parts or units where malfunctioning was assumed or detected the failing part is the controller
- F16H2061/1264—Hydraulic parts of the controller, e.g. a sticking valve or clogged channel
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Abstract
The invention provides an active diagnosis method and system for a main oil pressure system of a continuously variable transmission, wherein the method comprises the following steps: when the engine idle speed is within a stable threshold range and the vehicle is currently in park or neutral, activating an active diagnostic step comprising: controlling the current of the pressure control valve and the current of the oil pump switching control valve to the maximum value, and measuring the oil pressure; then the slope control oil pump switches the control valve current to the minimum value, measure the oil pressure; then the current of the pressure control valve is controlled to the minimum value in a slope mode, and the oil pressure is measured; then the current of the pressure control valve is controlled to the maximum value in a slope mode, and the oil pressure is measured; then the slope control oil pump switches the control valve current to the maximum value, and the oil pressure is measured; and judging whether an error is generated or not according to whether the oil pressure reaches a corresponding threshold value every time, wherein the error is normal. The invention utilizes the hydraulic principle of the main oil pressure system and combines the main oil pressure sensor to realize the active diagnosis and test of the hydraulic system, and can intervene in advance according to the test result to protect against further damage.
Description
Technical Field
The invention relates to an automobile main oil pressure system, in particular to an active diagnosis method for a main oil pressure system of a continuously variable transmission and a corresponding active diagnosis system.
Background
Continuously Variable Transmission (CVT) is widely used in automobiles. In the conventional continuously variable transmission, a main oil pressure control system having two oil pumps is designed, in which the operating modes of the two oil pumps are switched by an oil pump switching valve, and the main oil flow rate is adjusted by a pressure regulating valve.
The current control method of the main oil pressure system lacks the capability of active diagnosis and fault test, so that the fault of the main oil pressure system cannot be confirmed in advance, only when the pressure is monitored to be abnormal in the actual control process, the processing measures can be taken, and at the moment, the pressure is insufficient or other abnormal conditions are possibly generated to cause the abnormality of the next stage system, and even the gearbox is further damaged.
Disclosure of Invention
The invention aims to solve the problems that the existing control method of the main oil pressure system lacks the capability of actively diagnosing the main oil pressure system in advance, and the abnormality of the next-stage system can be caused when the main oil pressure is abnormal, and even the gearbox is further damaged.
In order to solve the above technical problem, the present invention provides an active diagnostic method for a main oil pressure system of a continuously variable transmission, comprising:
judging whether the idling of the engine is within a stable threshold range or not, and whether the current gear of the vehicle is in a parking gear or a neutral gear or not, and if so, activating an active diagnosis step; if not, continuing to judge;
the active diagnostic step comprises:
s1: controlling the pressure control valve current to a maximum value to request a minimum main oil pressure; controlling an oil pump to switch the current of a control valve to a maximum value so as to request a minimum main oil flow and detect whether the main oil pressure reaches a minimum threshold value; if the lowest threshold value cannot be reached, judging that an error 1 occurs; if the minimum threshold value can be reached, the step S2 is executed;
s2: the method comprises the following steps that a slope control oil pump switches control valve current to a minimum value to request maximum main oil flow; detecting whether the main oil pressure is within a middle threshold range; if the current time is not within the range of the middle threshold value, judging that an error 2 occurs; if the current time is within the middle threshold range, the step S3 is carried out;
s3: ramping the pressure control valve current to a minimum value to request a maximum main oil pressure; detecting whether the main oil pressure reaches a highest threshold value; if the maximum threshold value cannot be reached, judging that an error 3 occurs; if the maximum threshold value can be reached, the step S4 is executed;
s4: controlling the current of the pressure control valve to the maximum value by a slope so as to request the minimum main oil pressure, detecting whether the main oil pressure is in a middle threshold range, and if not, judging that an error occurs 4; if the current time is within the middle threshold range, the step S5 is executed;
s5: the method comprises the steps that a slope control oil pump switches control valve current to the maximum value to request the minimum main oil flow, whether main oil pressure reaches the minimum threshold value or not is detected, and if the main oil pressure cannot reach the minimum threshold value, an error is judged to occur 5; and if the minimum threshold value is reached, judging that the oil pressure of the main oil pressure system of the continuously variable transmission is normal.
By adopting the scheme, the diagnosis and the test of the highest pressure and the lowest pressure of the main oil pressure system and the reversing of the oil pump switching control valve are realized by setting specific currents for the oil pump switching control valve and the pressure control valve of the main oil pressure system and combining the detection of the change rule of the main oil pressure, and the control system can be intervened in advance according to the diagnosis result so as to protect the hardware of the gearbox from further damage; and the oil pump switching control valve and the pressure control valve are enabled to reciprocate for multiple times in the testing process, so that the clamping stagnation phenomenon which happens occasionally to occur to the oil pump switching control valve and the pressure control valve is eliminated.
According to another specific embodiment of the present invention, the active diagnosis method disclosed in the embodiment of the present invention, the active diagnosis step comprises: when at least one of error 1, error 2, error 3, error 4, and error 5 is determined to occur, the process repeats step S1.
By adopting the scheme, errors are further determined by repeating the diagnosis steps so as to eliminate the condition of inaccurate diagnosis occasionally, thereby improving the accuracy of the active diagnosis process.
According to another embodiment of the present invention, the active diagnosis method disclosed in the embodiment of the present invention repeats step S1 less than 3 times.
According to another specific embodiment of the present invention, the active diagnosis method disclosed in the embodiment of the present invention further includes:
when error 1 or error 5 occurs, recording error 1 or error 5;
when an error 2 or an error 4 occurs, requesting the infinitely variable speed pulley system to control the speed ratio change rate to be smaller than a change rate threshold value so as to avoid requesting the maximum main oil flow;
when error 3 occurs, control engine torque is requested to be less than a torque threshold, which is the maximum torque at which clamping force can be provided when torque is being transferred.
By adopting the scheme, the transmission system is requested to perform corresponding processing according to the diagnosis result, and then the transmission hardware is protected from further damage.
According to another specific embodiment of the present invention, the active diagnostic method disclosed in the embodiments of the present invention, the maximum value of the pressure control valve current is 1000mA, and the minimum value of the pressure control valve current is 0mA; the maximum value of the current of the oil pump switching control valve is 1000mA, and the minimum value of the current of the oil pump switching control valve is 0mA.
According to another specific embodiment of the present invention, the embodiment of the present invention discloses an active diagnostic method, wherein the minimum threshold value of the main oil pressure is 2bar ± 0.5bar; the highest threshold value of the main oil pressure is 60bar; the intermediate threshold range of the main oil pressure is 8 to 14bar.
The present invention also provides an active diagnostic system for a main oil pressure system of a continuously variable transmission for performing the active diagnostic method provided by the present invention, the active diagnostic system comprising:
the two oil pumps are connected with the main oil way;
the oil pump switching control valve is connected with the two oil pumps and is used for controlling and switching the working modes of the two oil pumps;
the pressure control valve is connected with the main oil way and used for controlling the main oil flow of the main oil way;
the pressure sensor is connected with the main oil way and used for detecting the main oil pressure;
the control unit controls and activates the active diagnosis system to perform the active diagnosis step; the control unit is respectively connected with the oil pump switching control valve and the pressure control valve so as to control the current of the oil pump switching control valve and the pressure control valve; the control unit is also connected with the pressure sensor to collect the main oil pressure; the control unit controls the current of an oil pump switching control valve and a pressure control valve and judges whether the oil pressure of the system is wrong or not according to the main oil pressure; wherein,
controlling the pressure control valve current to a maximum value to request a minimum main oil pressure; controlling the current of an oil pump switching control valve to be the maximum value so as to request the minimum main oil flow; when the main oil pressure can not reach the lowest threshold value, judging that an error 1 or an error 5 occurs;
controlling the pressure control valve current to a maximum value to request a minimum main oil pressure; controlling the current of an oil pump switching control valve to be the minimum value so as to request the maximum main oil flow; when the main oil pressure is not in the middle threshold range, judging that an error 2 or an error 4 occurs;
controlling the current of the pressure control valve to be the minimum value so as to request the maximum main oil pressure; controlling the current of an oil pump switching control valve to be the minimum value so as to request the maximum main oil flow; when the main oil pressure cannot reach the highest threshold value, judging that an error 3 occurs;
when none of error 1, error 2, error 3, error 4, and error 5 has occurred, it is determined that the oil pressure of the main hydraulic system of the continuously variable transmission is normal.
By adopting the scheme, the system execution active diagnosis method provided by the invention realizes active diagnosis test on the hydraulic system consisting of the main oil pressure control valve and the oil pump switching control valve by utilizing the hydraulic principle of the main oil pressure system and combining the main oil pressure sensor.
According to another embodiment of the present invention, an active diagnosis method is disclosed, wherein the control unit includes a recording module; the control unit is connected with the continuously variable transmission belt wheel system to send a request for controlling the speed ratio change rate of the continuously variable transmission belt wheel system; the control unit is also connected with an engine control system and sends a request to control the torque of the engine; wherein,
when an error 1 or an error 5 occurs, the recording module records the error 1 or the error 5;
when an error 2 or an error 4 occurs, the control unit requests the infinitely variable speed pulley system to control the speed ratio change rate to be smaller than a change rate threshold value so as to avoid requesting the maximum main oil flow;
when error 3 occurs, the control unit requests the engine control system to control the engine torque to be less than a torque threshold, which is the maximum torque that can provide the clamping force when torque is transmitted.
By adopting the scheme, the system requests the gearbox system to perform corresponding processing according to the diagnosis result, and then protects the gearbox hardware from further damage.
According to another embodiment of the present invention, the active diagnosis method disclosed in the embodiment of the present invention, the oil pump switching control valve is a normally high type solenoid valve and is connected to the two oil pumps through a switching valve; the pressure control valve is a normally high type electromagnetic valve and is connected with the main oil way through a pressure regulating valve.
The invention has the beneficial effects that:
the active diagnosis method and the active diagnosis system for the main oil pressure system of the continuously variable transmission provided by the invention realize the active diagnosis test of the main oil pressure system of the continuously variable transmission through multi-stage test, and carry out the active diagnosis test on a hydraulic system consisting of a main oil pressure control valve and an oil pump switching control valve by utilizing the hydraulic principle of the main oil pressure system and combining a main oil pressure sensor. The method specifically comprises the steps of setting specific currents for an oil pump switching control valve and a pressure control valve of a main oil pressure system, and combining the change rule of detecting the main oil pressure to diagnose and test whether the highest pressure and the lowest pressure of the main oil pressure system and the oil pump switching control valve are reversed. And in the testing process, the oil pump switching control valve and the pressure control valve are enabled to reciprocate for multiple times, so that the accidental clamping stagnation phenomenon of the oil pump switching control valve and the pressure control valve is eliminated, and the occurrence of faults is further repeatedly confirmed.
Drawings
FIG. 1 is a schematic diagram of power transmission of a main oil pressure system of a continuously variable transmission;
FIG. 2 is a flowchart of an active diagnosis method according to embodiment 1 of the present invention;
FIG. 3 is a schematic diagram showing a change in current of a pressure control valve according to the active diagnostic method of embodiment 1 of the present invention;
FIG. 4 is a schematic diagram showing the change in current of the oil pump switching control valve according to the active diagnostic method of embodiment 1 of the present invention;
FIG. 5 is a schematic diagram showing changes in the main oil pressure in a normal state in the active diagnostic method according to embodiment 1 of the present invention;
fig. 6 is a schematic diagram of an active diagnostic system according to embodiment 1 of the present invention.
Description of reference numerals:
1: an engine; 2: a hydraulic torque converter; 3: a D/R clutch; 4: a continuously variable pulley system; 5: a wheel end;
10: a first oil pump; 20: a second oil pump; 30: an oil pump switching control valve; 40: a pressure control valve; 50: a pressure sensor; 60: a main oil path; 70: a switching valve; 80: a pressure regulating valve; 90: a pressure reducing valve.
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure. While the invention will be described in conjunction with the preferred embodiments, it is not intended that the features of the invention be limited to that embodiment. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
It should be noted that in this specification, like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the product of the present invention is usually placed in when used, and are only used for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and therefore, should not be construed as limiting the present invention.
The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
In the description of the present embodiment, it should be further noted that, unless explicitly stated or limited otherwise, the terms "disposed," "connected," and "connected" are to be interpreted broadly, e.g., as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present embodiment can be understood in specific cases by those of ordinary skill in the art.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
The present invention provides an active diagnostic method for a main oil pressure system of a continuously variable transmission, wherein fig. 1 shows a power transmission process of the continuously variable transmission, wherein an arrow in the figure is a power transmission direction, power is output from an engine 1 to a hydraulic torque converter 2 with a lock-up clutch function, then to a D/R clutch 3 with forward and reverse control, and finally to a wheel end 5 through a continuously variable transmission pulley system 4. The active diagnostic method for the main oil pressure system of the continuously variable transmission, which includes the steps of:
judging whether the idling speed of the engine is in a stable threshold range or not and whether the current gear of the vehicle is in a parking gear (P gear) or a neutral gear (N gear) or not according to the driving related data, and if so, activating an active diagnosis step; if not, continuing to judge; the stable threshold range refers to the idle speed range of the engine in stable operation, and the stable threshold range of the idle speed of the common gasoline engine is 750 +/-100 rpm.
Fig. 2 is a flowchart of a pressure control valve in the active diagnosis method of the present invention, fig. 3 is a schematic diagram of a current change of the pressure control valve in the active diagnosis method of the present invention, fig. 4 is a schematic diagram of a current change of an oil pump switching control valve, fig. 5 is a schematic diagram of a change of a main oil pressure under a normal condition, and the following describes an activated active diagnosis step with reference to fig. 2 to 5, where the active diagnosis step includes:
s1: phase (1) of fig. 3-5, in which the pressure control valve current is controlled to a maximum value as shown in fig. 3 to request a minimum main oil pressure; controlling the oil pump to switch the control valve current to a maximum value as shown in fig. 4 to request a minimum main oil flow; detecting whether the main oil pressure reaches a lowest threshold value or not under the condition that the maximum value is stable; if the lowest threshold value cannot be reached, judging that an error 1 occurs; if the minimum threshold can be reached as shown in fig. 5, the process proceeds to step S2.
S2: namely, the (2) th and (3) th stages in fig. 3-5, wherein the (2) th stage is a control stage and the (3) th stage is a detection stage; wherein the pressure control valve current remains constant at a maximum value to request a minimum main oil pressure as shown in fig. 3; ramp-controlled oil pump switching control valve current to a minimum value as shown in fig. 4 to request maximum main oil flow; detecting whether the main oil pressure is increased to be within the middle threshold value range or not, wherein the main oil pressure is increased; if the current time is not within the range of the middle threshold value, judging that an error 2 occurs; if the threshold value is within the intermediate threshold value range as shown in fig. 5, the process proceeds to step S3.
S3: namely, the (4) th stage and the (5) th stage in fig. 3-5, wherein the (4) th stage is the control stage, and the (5) th stage is the detection stage; wherein the pressure control valve current is ramped to a minimum value as shown in FIG. 3 to request maximum main oil pressure; the oil pump switching control valve current is kept at a minimum value as shown in fig. 4 to request a maximum main oil flow; when the main oil pressure is increased to the highest value, detecting whether the main oil pressure reaches a highest threshold value; if the maximum threshold value cannot be reached, judging that an error 3 occurs; if the maximum threshold value can be reached as shown in fig. 5, the process proceeds to step S4.
S4: namely, the (6) th stage and the (7) th stage in fig. 3-5, wherein the (6) th stage is the control stage, and the (7) th stage is the detection stage; wherein the pressure control valve current is ramped to a maximum value as shown in FIG. 3 to request a minimum main oil pressure; the oil pump switching control valve current is kept at a minimum value as shown in fig. 4 to request a maximum main oil flow; if the main oil pressure is reduced to be within the middle threshold range, judging that an error 4 occurs; if the threshold value falls within the intermediate threshold value range as shown in fig. 5, the process proceeds to step S5.
S5: namely, the (8) th and (9) th stages in fig. 3-5, wherein the (8) th stage is a control stage, and the (9) th stage is a detection stage; wherein the pressure control valve current remains at a maximum value as shown in FIG. 3 to request a minimum main oil pressure; as shown in fig. 4, the oil pump is controlled to switch the control valve current to the maximum value by a slope to request the minimum main oil flow, at this time, the main oil pressure should be reduced to the minimum, whether the main oil pressure reaches the minimum threshold value is detected, and if the main oil pressure cannot reach the minimum threshold value, an error is determined to occur 5; if the minimum threshold value is reached as shown in fig. 5, it is determined that the hydraulic pressure of the main hydraulic system of the continuously variable transmission is normal.
It should be noted that throughout the active diagnostic process, the engine is required to maintain the idle speed within the stable threshold range and to monitor the engine speed within the corresponding range. The diagnostic steps described above may also be repeated multiple times to confirm, i.e., the diagnostic steps are repeated after any error is confirmed for further confirmation. After each judgment error occurs, the method can return to the starting step to diagnose and confirm again, can also carry out corresponding processing to eliminate the error, can also continue to carry out the next diagnosis, and records the error types. The maximum value and the minimum value of the pressure control valve current and the maximum value and the minimum value of the oil pump switching control valve current are determined according to the specific device model of the main oil pressure system of the continuously variable transmission and the like, and the maximum threshold value and the minimum threshold value of the main oil pressure are correspondingly determined. The maximum value of the common current is about 1000mA, and the minimum value is generally 0mA. The highest threshold value of the main oil pressure is 60bar or a certain pressure value more than 60bar, such as 65bar, 70bar and the like; the lowest threshold is close to 0, such as may be 2bar; the intermediate threshold is a number between the highest threshold and the lowest threshold, and may be determined in a calibration manner, such as 12bar.
By adopting the scheme, the active diagnosis test of the main oil pressure system of the continuously variable transmission is realized through multi-stage test, and the active diagnosis test of the hydraulic system consisting of the main oil pressure control valve and the oil pump switching control valve is carried out by utilizing the hydraulic principle of the main oil pressure system and combining the main oil pressure sensor. The method specifically comprises the steps of setting specific currents for an oil pump switching control valve and a pressure control valve of a main oil pressure system, and combining the change rule of detecting the main oil pressure to diagnose and test whether the highest pressure and the lowest pressure of the main oil pressure system and the oil pump switching control valve are reversed. And in the testing process, the oil pump switching control valve and the pressure control valve are enabled to reciprocate for multiple times, so that the clamping stagnation phenomenon happened by the oil pump switching control valve and the pressure control valve is eliminated, and the occurred faults are further confirmed repeatedly. The active diagnosis test method provided by the invention is suitable for any traditional fuel vehicle or hybrid vehicle with a continuously variable transmission.
According to another embodiment of the invention, the step of actively diagnosing comprises: when at least one of error 1, error 2, error 3, error 4, and error 5 is determined to occur, the process repeatedly proceeds to step S1.
Specifically, after a certain error is found, the diagnostic step S1 may be requested to be repeatedly entered; it is also possible to request repeated entering of the diagnosing step S1 after finding one or several errors after completing the steps S1-S5. The upper limit of the number of times of repeating the diagnosis may be determined according to the actual situation, and may be, for example, 1 to 5 times or the like. And before each request for repeatedly entering the process of the diagnosis step, whether the vehicle condition meets the conditions is further determined, namely whether the idle speed of the engine is within a stable threshold range and whether the current gear of the vehicle is in a parking gear (P gear) or a neutral gear (N gear) is determined.
By adopting the scheme, errors are further determined by repeating the diagnosis steps so as to eliminate the condition of inaccurate diagnosis occasionally, thereby improving the accuracy of the active diagnosis process.
According to another embodiment of the present invention, the number of times of repeatedly entering step S1 is less than 3. That is, the number of times of repeating the step S1 is 1 or 2, and the diagnosis is performed at most 3 times in total by adding the diagnosis step performed for the first time.
According to another embodiment of the invention, the step of actively diagnosing further comprises: when error 1 or error 5 occurs, the directional pressure control valve is stuck and cannot control to the lowest main oil pressure, and only record the pressure control valve is recorded, and record that error 1 or error 5 occurs.
When an error 2 or an error 4 occurs, the directional oil pump switching control valve cannot be switched normally, namely, the dual oil pumps cannot be provided to work normally, and at the moment, the flow control module of the infinitely variable speed pulley system is requested to control the speed ratio change rate to be smaller than the change rate threshold value so as to avoid requesting the maximum main oil flow; the speed ratio change rate when the change rate threshold value corresponds to the maximum main oil flow request; of course, a larger main oil flow may be defined, with the set rate of change threshold corresponding to the corresponding speed ratio rate of change at the time the larger main oil flow is requested.
When error 3 occurs, the pointing system may not reach the maximum pressure, possibly causing the clamping force to fail to reach the control target, and therefore the requested control engine torque is less than the torque threshold, which is the maximum torque that can provide the clamping force during torque transmission, to prevent excessive torque transmission from failing to provide sufficient clamping force and thereby slipping.
By adopting the scheme, the transmission system is requested to perform corresponding processing according to the diagnosis result, and then the transmission hardware is protected from further damage.
According to another embodiment of the present invention, the maximum value of the pressure control valve current is 1000mA, and the minimum value of the pressure control valve current is 0mA; the maximum value of the current of the oil pump switching control valve is 1000mA, and the minimum value of the current of the oil pump switching control valve is 0mA.
According to another embodiment of the invention, the minimum threshold value of the main oil pressure is 2bar ± 0.5bar; the highest threshold value of the main oil pressure is 60bar; the intermediate threshold range of the main oil pressure is 8 to 14bar.
Example 2
The present invention also provides an active diagnostic system for a main oil pressure system of a continuously variable transmission for performing the active diagnostic method of embodiment 1, which, as shown in fig. 6, includes two oil pumps 10 and 20, an oil pump switching control valve 30, a pressure control valve 40, a pressure sensor 50, and a control unit (not shown in the drawings).
The two oil pumps include a first oil pump 10 and a second oil pump 20, which are connected to the main oil path 60 and also connected to the engine and the oil tank to supply hydraulic oil by engine driving. The oil pump switching control valve 30 is connected to the first oil pump 10 and the second oil pump 20, and is used for controlling and switching the operation modes of the first oil pump 10 and the second oil pump 20. The operation modes of the first and second oil pumps 10 and 20 include that only the first oil pump 10 is operated, only the second oil pump 20 is operated, and the first and second oil pumps 10 and 20 are simultaneously operated. The pressure sensor 50 is connected to the main oil passage 60 for detecting the main oil pressure.
The control unit can acquire driving related data through a vehicle control device such as an Electronic Control Unit (ECU) and the like to judge whether the idle speed of the engine is within a stable threshold range or not and whether the current gear of the vehicle is in a parking gear or a neutral gear or not, and if so, an active diagnosis system is activated to perform an active diagnosis step; if not, continuously acquiring the data and judging. Wherein the control unit may specifically be an automatic gearbox control unit TCU.
The control unit is connected with the oil pump switching control valve 30 and the pressure control valve 40 respectively to control the current of the oil pump switching control valve 30 and the pressure control valve 40; the control unit is also connected with a pressure sensor 50 to collect the main oil pressure; the control unit controls the currents of the oil pump switching control valve 30 and the pressure control valve 40, and determines whether or not an error occurs in the system oil pressure based on the main oil pressure.
Wherein, as in the active diagnostic step in embodiment 1, the control unit controls the pressure control valve 40 current to the maximum value to request the minimum main oil pressure; controlling the current of the oil pump switching control valve 30 to be a maximum value to request a minimum main oil flow; when the main oil pressure cannot reach the minimum threshold, it is determined that error 1 or error 5 occurs. Controlling the pressure control valve 40 current to a maximum value to request a minimum main oil pressure; controlling the current of the oil pump switching control valve 30 to be the minimum value so as to request the maximum main oil flow; when the main oil pressure is not within the intermediate threshold range, it is judged that an error 2 or an error 4 occurs. Controlling the pressure control valve 40 current to a minimum value to request a maximum main oil pressure; controlling the current of the oil pump switching control valve 30 to be the minimum value so as to request the maximum main oil flow; when the main oil pressure cannot reach the maximum threshold value, it is determined that an error 3 occurs. When none of error 1, error 2, error 3, error 4, and error 5 has occurred, it is determined that the oil pressure of the main hydraulic system of the continuously variable transmission is normal.
By adopting the scheme, the system execution active diagnosis method provided by the invention realizes active diagnosis test on the hydraulic system consisting of the main oil pressure control valve and the oil pump switching control valve by utilizing the hydraulic principle of the main oil pressure system and combining the main oil pressure sensor.
According to another embodiment of the present invention, a control unit includes a recording module; the control unit is connected with the continuously variable transmission belt wheel system to send a request to control the speed ratio change rate of the continuously variable transmission belt wheel system, and specifically, the speed ratio change rate can be controlled by flow; the control unit is also connected to the engine control system and sends a request to control the torque of the engine.
When an error 1 or an error 5 occurs, the recording module records the error 1 or the error 5; when an error 2 or an error 4 occurs, the control unit requests the infinitely variable speed pulley system to control the speed ratio change rate to be smaller than a change rate threshold value so as to avoid requesting the maximum main oil flow; when error 3 occurs, the control unit requests the engine control system to control the engine torque to be less than a torque threshold, which is the maximum torque that can provide the clamping force when torque is transmitted.
By adopting the scheme, the system requests the gearbox system to perform corresponding processing according to the diagnosis result, and further protects the gearbox hardware from further damage.
According to another embodiment of the present invention, as shown in fig. 6, the oil pump switching control valve 30 is a normally high type solenoid valve and is connected to the two oil pumps 10 and 20 through a switching valve 70; the pressure control valve 40 is a normally high type solenoid valve and is connected to the main oil passage through a pressure regulating valve 80.
Specifically, as shown in fig. 6, one end of the switching valve 70 is connected to the output end of the oil pump switching control valve 30, and the other end is connected to the drain port of the pressure regulating valve 80, and the oil pump switching control valve 30 controls the switching of the switching valve 70 by the current change control. One end of the pressure regulating valve 80 is connected with the output end of the pressure control valve 40, the other end of the pressure regulating valve 80 is connected with the main oil path 60, the pressure control valve 40 regulates the pressure of the main oil path 60 through the current variable control pressure regulating valve 80, the pressure regulating valve 80 is connected with the main oil path 60, and when the main oil path 60 reaches the set pressure, redundant hydraulic oil can be discharged through the pressure regulating valve 80.
It should be noted that the main oil passage 60 may further include a pressure reducing valve 90, the oil pump switching control valve 30 and the pressure control valve 40 are connected to a pressure regulating valve 80, and the pressure regulating valve 80 may provide a stable input pressure to the oil pump switching control valve 30 and the pressure control valve 40.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing is a more detailed description of the invention, taken in conjunction with the specific embodiments thereof, and that no limitation of the invention is intended thereby. Various changes in form and detail, including simple deductions or substitutions, may be made by those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. An active diagnostic method for a main oil pressure system of a continuously variable transmission, characterized by comprising the steps of:
judging whether the idling of the engine is within a stable threshold range or not, and whether the current gear of the vehicle is in a parking gear or a neutral gear or not, and if so, activating an active diagnosis step; if not, continuing to judge;
the active diagnostic step comprises:
s1: controlling the pressure control valve current to a maximum value to request a minimum main oil pressure; controlling an oil pump to switch the current of a control valve to a maximum value so as to request a minimum main oil flow and detect whether the main oil pressure reaches a minimum threshold value; if the lowest threshold value cannot be reached, judging that an error 1 occurs; if the lowest threshold value can be reached, the step S2 is carried out;
s2: ramp controlling the oil pump switching control valve current to a minimum value to request a maximum main oil flow; detecting whether the main oil pressure is within an intermediate threshold range; if the current time is not within the middle threshold range, judging that an error 2 occurs; if the current time is within the intermediate threshold range, the step S3 is carried out;
s3: ramping the pressure control valve current to a minimum value to request a maximum main oil pressure; detecting whether the main oil pressure reaches a maximum threshold value; if the highest threshold value cannot be reached, judging that an error 3 occurs; if the maximum threshold value can be reached, the step S4 is carried out;
s4: ramp controlling the pressure control valve current to a maximum value to request the minimum main oil pressure, detecting whether the main oil pressure is within the intermediate threshold range, and if not, determining that an error occurs 4; if the current time is within the middle threshold range, the step S5 is executed;
s5: ramp-controlling the current of the oil pump switching control valve to a maximum value so as to request the minimum main oil flow, detecting whether the main oil pressure reaches the lowest threshold value, and if the main oil pressure cannot reach the lowest threshold value, judging that an error 5 occurs; and if the minimum threshold value is reached, judging that the oil pressure of the main oil pressure system of the continuously variable transmission is normal.
2. The active diagnostic method of claim 1, wherein the active diagnostic step comprises:
and when at least one of the errors 1, 2, 3, 4 and 5 is judged to occur, the step S1 is repeatedly executed.
3. The active diagnostic method according to claim 2, wherein the number of times of repeating the step S1 is less than 3.
4. The active diagnostic method according to any one of claims 1 to 3, wherein the active diagnostic step further comprises:
recording the error 1 or the error 5 when the error 1 or the error 5 occurs;
when the error 2 or the error 4 occurs, requesting a continuously variable transmission pulley system to control a speed ratio change rate to be smaller than a change rate threshold value so as to avoid requesting the maximum main oil flow;
when the error 3 occurs, the control engine torque is requested to be less than a torque threshold, which is the maximum torque at which the clamping force can be provided at the time of torque transmission.
5. The active diagnostic method of claim 4,
the maximum value of the pressure control valve current is 1000mA, and the minimum value of the pressure control valve current is 0mA;
the maximum value of the current of the oil pump switching control valve is 1000mA, and the minimum value of the current of the oil pump switching control valve is 0mA.
6. The active diagnostic method of claim 5,
the lowest threshold value of the main oil pressure is 2bar +/-0.5 bar; the highest threshold value of the main oil pressure is 60bar; the intermediate threshold range of the main oil pressure is 8-14 bar.
7. An active diagnostic system for a main oil pressure system of a continuously variable transmission for performing the active diagnostic method of any one of claims 1 to 6, the active diagnostic system comprising:
the two oil pumps are connected with the main oil way;
the oil pump switching control valve is connected with the two oil pumps and used for controlling and switching the working modes of the two oil pumps;
the pressure control valve is connected with the main oil way and used for controlling the main oil flow of the main oil way;
the pressure sensor is connected with the main oil circuit and used for detecting the main oil pressure;
a control unit which controls to activate the active diagnostic system to perform an active diagnostic step; the control unit is respectively connected with the oil pump switching control valve and the pressure control valve so as to control the current of the oil pump switching control valve and the pressure control valve; the control unit is also connected with the pressure sensor to collect the main oil pressure; the control unit controls the current of the oil pump switching control valve and the pressure control valve and judges whether the oil pressure of the system is wrong or not according to the main oil pressure; wherein,
controlling the pressure control valve current to a maximum value to request a minimum main oil pressure; controlling the current of the oil pump switching control valve to be a maximum value so as to request a minimum main oil flow; when the main oil pressure cannot reach the lowest threshold value, judging that an error 1 or an error 5 occurs;
controlling the pressure control valve current to a maximum value to request the minimum main oil pressure; controlling the current of the oil pump switching control valve to be the minimum value so as to request the maximum main oil flow; when the main oil pressure is not in the middle threshold range, judging that an error 2 or an error 4 occurs;
controlling the current of the pressure control valve to be the minimum value so as to request the maximum main oil pressure; controlling the current of the oil pump switching control valve to be the minimum value so as to request the maximum main oil flow; when the main oil pressure cannot reach the highest threshold value, judging that an error 3 occurs;
and when the errors 1, 2, 3, 4 and 5 do not occur, judging that the oil pressure of the main oil pressure system of the continuously variable transmission is normal.
8. The active diagnostic system of claim 7, wherein the control unit comprises a logging module; the control unit is connected with the continuously variable transmission belt wheel system to send a request for controlling the speed ratio change rate of the continuously variable transmission belt wheel system; the control unit is also connected with an engine control system and sends a request to control the torque of the engine; wherein,
when the error 1 or the error 5 occurs, the recording module records the error 1 or the error 5;
when the error 2 or the error 4 occurs, the control unit requests the infinitely variable speed pulley system to control a speed ratio change rate to be smaller than a change rate threshold value so as to avoid requesting the maximum main oil flow rate;
when the error 3 occurs, the control unit requests the engine control system to control the engine torque to be less than a torque threshold, which is a maximum torque capable of providing a clamping force at the time of torque transmission.
9. The active diagnostic system according to claim 8, wherein the oil pump switching control valve is a normally high type solenoid valve and is connected to both of the oil pumps through a switching valve; the pressure control valve is a normally high type electromagnetic valve and is connected with the main oil way through a pressure regulating valve.
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|---|---|---|---|
| CN202110771838.0A CN115596838A (en) | 2021-07-08 | 2021-07-08 | Active diagnostic method and system for main oil pressure system of continuously variable transmission |
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| CN202110771838.0A CN115596838A (en) | 2021-07-08 | 2021-07-08 | Active diagnostic method and system for main oil pressure system of continuously variable transmission |
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| CN202110771838.0A Pending CN115596838A (en) | 2021-07-08 | 2021-07-08 | Active diagnostic method and system for main oil pressure system of continuously variable transmission |
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| CN (1) | CN115596838A (en) |
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