CN110219916B - Monitoring method and system for switching working states of clutch and brake - Google Patents
Monitoring method and system for switching working states of clutch and brake Download PDFInfo
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- CN110219916B CN110219916B CN201910646882.1A CN201910646882A CN110219916B CN 110219916 B CN110219916 B CN 110219916B CN 201910646882 A CN201910646882 A CN 201910646882A CN 110219916 B CN110219916 B CN 110219916B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012544 monitoring process Methods 0.000 title claims abstract description 25
- 238000000926 separation method Methods 0.000 claims description 16
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000007257 malfunction Effects 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 32
- 230000009286 beneficial effect Effects 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 8
- 238000011217 control strategy Methods 0.000 description 7
- 239000004460 silage Substances 0.000 description 6
- 238000003306 harvesting Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D69/00—Driving mechanisms or parts thereof for harvesters or mowers
- A01D69/08—Clutches
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01D—HARVESTING; MOWING
- A01D69/00—Driving mechanisms or parts thereof for harvesters or mowers
- A01D69/10—Brakes
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D2066/005—Force, torque, stress or strain
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
- F16D2066/008—Arrangements for monitoring working conditions, e.g. wear, temperature of clutches
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Mechanical Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention provides a method and a system for monitoring the switching working state of a clutch and a brake, wherein the method comprises the following steps: respectively collecting and comparing pressure data on pipelines close to the clutch and the brake; and judging whether the clutch and the brake work normally or not according to the comparison result. By means of the monitoring method, whether the clutch and the controller work normally or not is timely found, and when the control system is maintained, a user knows whether the clutch or the brake is in failure, so that the user can maintain the control system conveniently, and maintenance efficiency is improved.
Description
Technical Field
The invention relates to the technical field of mechanical control, in particular to a method and a system for monitoring switching working states of a clutch and a brake.
Background
When the silage machine engine is used for harvesting, the engine outputs power, the main clutch is combined, and the transmission belt is used for transmitting and harvesting; when the harvester runs, the harvesting operation is stopped, the main clutch is separated, the brake clamps the main clutch disc and is in a braking state, so that the braking safety of the transmission belt system during the non-harvesting operation of the silage harvester is realized, and sufficient power is output under the combination of the main clutch for harvesting operation.
In the prior art, the switching between the clutch and the brake of the silage machine is manually operated, a first switch for controlling the opening and closing of the clutch and a second switch for controlling the opening and closing of the brake in the silage machine are independently arranged, and a user needs to automatically open and close the first switch and the second switch. The manual operation error rate of the silage machine in the prior art is high, whether the silage machine works normally or not cannot be determined, and the labor intensity is high.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a method and a system for monitoring the switching working state of a clutch and a brake.
The technical scheme for solving the technical problems is as follows: a method of monitoring a clutch and brake switching operating condition comprising: respectively collecting and comparing pressure data on pipelines close to the clutch and the brake;
and judging whether the clutch and the brake work normally or not according to the comparison result.
The beneficial effects of the invention are as follows: by designing a monitoring method for switching working states of the clutch and the brake, the safety and the reliability of the system are improved.
On the basis of the technical scheme, the invention can be improved as follows.
Further, before the step of collecting and comparing pressure data on the pipelines near the clutch and the brake respectively, the method further comprises the following steps:
The current start-up mode includes: controlling the first end port of the pressure reducing valve to be communicated with the third end port of the pressure reducing valve, and controlling the first end port of the hydraulic control valve to be communicated with the third end port of the hydraulic control valve, so that the brake is in a clamping braking state;
in the starting mode, simultaneously controlling a first end port of the proportional pressure reducing valve to be closed, and a second end port of the proportional pressure reducing valve to be communicated with a third end port of the proportional pressure reducing valve, so that the clutch is in a separation state;
current clutch engagement modes include: the first end port of the proportional pressure reducing valve is controlled to be communicated with the third end port of the proportional pressure reducing valve through a first electric signal, the valve core of the hydraulic control valve is driven by the output oil pressure of the proportional pressure reducing valve, so that the first end port of the hydraulic control valve is closed, and the second end port of the pressure reducing valve is controlled to be communicated with the third end port of the pressure reducing valve, so that the brake is in a released state;
the proportional pressure reducing valve is controlled to drive the clutch to be combined through a second electric signal;
the current clutch release modes include: controlling the first end port of the proportional pressure reducing valve to be closed, and controlling the second end port of the proportional pressure reducing valve to be communicated with the third end port of the proportional pressure reducing valve so that the clutch is in a separation state;
Meanwhile, a first end port of the pressure reducing valve is controlled to be communicated with a third end port of the pressure reducing valve, and a first end port of the hydraulic control valve is controlled to be communicated with the third end port of the hydraulic control valve, so that the brake is in a clamping braking state.
The beneficial effects of adopting the further scheme are as follows: by designing the control strategy, the control system generates corresponding control instructions according to the specific working modes, so that corresponding valves of the control system are controlled to perform corresponding work, the expected working modes are realized, and the automation of the system is improved.
Further, the step of judging whether the clutch and the brake work normally according to the comparison result includes:
under the current starting mode, comparing the brake pressure value detected by the second sensor with a first preset pressure value, and comparing the clutch pressure value detected by the first sensor with a second preset pressure value;
when the pressure value of the brake is larger than the first preset pressure value and the pressure value of the clutch is smaller than the second preset pressure value, normal operation of the clutch and the brake is indicated;
when the pressure value of the brake is smaller than or equal to the first preset pressure value or the pressure value of the clutch is larger than or equal to the second preset pressure value, controlling the alarm equipment to perform alarm work;
Or alternatively, the first and second heat exchangers may be,
under the current clutch combination mode, comparing the brake pressure value detected by the second sensor with a third preset pressure value, and comparing the clutch pressure value detected by the first sensor with a range from a fourth preset pressure value to a fifth preset pressure value;
when the brake pressure value is smaller than the third preset pressure value and the clutch pressure value is in the range from the fourth preset pressure value to the fifth preset pressure value, normal operation of the clutch and the brake is indicated;
when the brake pressure value is greater than or equal to the third preset pressure value or the clutch pressure value is out of the range from the fourth preset pressure value to the fifth preset pressure value, controlling the alarm device to perform alarm work;
or alternatively, the first and second heat exchangers may be,
under the current clutch release mode, comparing the brake pressure value detected by the second sensor with a sixth preset pressure value, and comparing the clutch pressure value detected by the first sensor with a seventh preset pressure value;
when the brake pressure value is larger than the sixth preset pressure value and the clutch pressure value is smaller than the seventh preset pressure value, normal operation of the clutch and the brake is indicated;
And when the pressure value of the brake is smaller than or equal to the sixth preset pressure value or the pressure value of the clutch is larger than or equal to the seventh preset pressure value, controlling the alarm equipment to perform alarm work.
The beneficial effects of adopting the further scheme are as follows: under a specific working mode, comparing the pressure detected by the sensor with a corresponding preset value in the controller, and judging whether the clutch and the brake work normally or not. And when the system works normally, a normal control strategy is kept, and when the system works abnormally, the controller controls the alarm equipment to carry out alarm processing, so that the safety and the reliability of the system are improved.
Further, in the current clutch engagement mode, when the brake pressure value is smaller than the third preset pressure value and the clutch pressure value is within the range from the fourth preset pressure value to the fifth preset pressure value, continuously controlling the proportional pressure reducing valve to operate for a first preset time through a first electric signal;
in the process of controlling the proportional pressure reducing valve to drive the clutch to be combined through a second electric signal, at least one of the following steps is executed:
when the pressure value of the brake is smaller than the third preset pressure value, controlling the alarm equipment to alarm the hydraulic control valve fault;
When the pressure value of the brake is smaller than the third preset pressure value and the pressure value of the clutch is smaller than the fourth preset pressure value, normal operation of the clutch and the brake is indicated;
when the brake pressure value is smaller than the third preset pressure value and the clutch pressure value is larger than the fifth preset pressure value, controlling the alarm device to alarm against a fault of a proportional pressure reducing valve;
and when the pressure value of the brake is larger than the third preset pressure value, controlling the alarm equipment to alarm the hydraulic control valve fault.
The beneficial effects of adopting the further scheme are as follows: under the clutch combination mode, the proportional pressure reducing valve is continuously controlled through a first electric signal to drive the hydraulic control valve to move so as to separate the brake, the clutch is continuously controlled through a second electric signal to combine, the pressure in the system is detected and analyzed in real time at different stages, the specific part is judged to have faults according to different analysis results, and the user is informed of the specific fault part and fault reasons through the alarm equipment, so that the intelligent degree of automatic control of the system is improved.
Further, in the clutch release mode, when the brake pressure value is smaller than or equal to the sixth preset pressure value, the alarm device is controlled to alarm the hydraulic control valve fault.
The beneficial effects of adopting the further scheme are as follows: and in the clutch release mode, detecting and analyzing the pressure in the system in real time, judging which part has faults according to different analysis results, informing a user of the specific fault part and fault reasons through alarm equipment, and improving the intelligent degree of automatic control of the system.
In addition, the invention also provides a monitoring system for switching working states of the clutch and the brake, which comprises the following components: a control device for switching the clutch and brake modes of operation, a first sensor for collecting clutch line pressure data, a second sensor for collecting brake line pressure data and a controller,
the first sensor and the second sensor are respectively connected with the controller;
the controller is used for comparing pressure data on a pipeline close to the clutch and the brake;
and judging whether the clutch and the brake work normally or not according to the comparison result.
The beneficial effects of the invention are as follows: through setting up the sensor, the running state of real-time supervision control system, in time discovers whether clutch and controller normally work to at the in-process to control system maintenance, pressure in the pipeline that gathers through two sensors, the user can easily know specifically clutch trouble or stopper trouble, and the user of being convenient for carries out accurate maintenance to control system, improves maintenance efficiency. The safety and the reliability of the system are improved.
On the basis of the technical scheme, the invention can be improved as follows.
Further, the control device includes: a pressure reducing valve, a proportional pressure reducing valve and a hydraulic control valve,
the pressure reducing valve, the proportional pressure reducing valve and the hydraulic control valve are respectively connected with the controller;
the first end port of the proportional pressure reducing valve is connected with a first pipeline, the second end port of the proportional pressure reducing valve is connected with an oil tank through a pipeline, the third end port of the proportional pressure reducing valve is connected with the input end of an oil cylinder of a clutch through a pipeline, the first sensor is arranged on the pipeline between the proportional pressure reducing valve and the oil cylinder of the clutch, and the first sensor is used for detecting the pressure in the pipeline;
the first end port of the pressure reducing valve is connected with a first pipeline, the second end port of the pressure reducing valve is connected with the oil tank through a pipeline, the third end port of the pressure reducing valve is connected with the first end port of the hydraulic control valve through a pipeline, the second end port of the hydraulic control valve is connected with the oil tank through a pipeline, and the third end port of the hydraulic control valve is connected with the input end of an oil cylinder of the brake through a pipeline; the valve core of the hydraulic control valve is connected with a pipeline between the proportional pressure reducing valve and the oil cylinder of the clutch through a pipeline, and is used for pushing the valve core of the hydraulic control valve to move by utilizing the pressure in the pipeline between the proportional pressure reducing valve and the clutch; the second sensor is disposed between the pilot operated valve and the brake cylinder, and is configured to detect a pressure in a line.
The beneficial effects of adopting the further scheme are as follows: the pressure states of the clutch and the brake are detected in real time through the sensor, and the controller analyzes and processes the pressure states, so that the safety and reliability of the system are improved.
Further, the method further comprises the following steps: and the alarm device is connected with the controller.
The beneficial effects of adopting the further scheme are as follows: and the alarm device is used for timely alarming to a user when the clutch or the brake works abnormally.
Further, the first sensor, the second sensor, the alarm device and the controller are connected through a CAN bus.
The beneficial effects of adopting the further scheme are as follows: signal transmission between the electrical parts is facilitated, and accuracy of detection results is improved.
Further, the first sensor and the second sensor are pressure sensors or flow sensors.
The beneficial effects of adopting the further scheme are as follows: the pressure in the system is detected through the sensor, whether the working state of the system is normal is detected, and the safety and reliability of the system are improved.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a monitoring system for switching working states of a clutch and a brake according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a monitoring system for switching working states of a clutch and a brake according to an embodiment of the present invention.
Fig. 3 is a schematic flow chart of a method for monitoring a switching operation state of a clutch and a brake according to an embodiment of the present invention.
Reference numerals illustrate: 1-a pressure reducing valve; 2-a proportional pressure reducing valve; 3-a hydraulically controlled valve; a 4-brake; 6-an oil tank; 7-clutch; 8-a first sensor; 9-a second sensor; 10-first pipeline.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 3, fig. 3 is a schematic flowchart of a method for monitoring a switching operation state of a clutch and a brake according to an embodiment of the present invention. The invention provides a method for monitoring the switching working state of a clutch and a brake, which comprises the following steps: respectively collecting and comparing pressure data on pipelines close to the clutch and the brake;
and judging whether the clutch and the brake work normally or not according to the comparison result.
The clutch is separated when the brake is braked by designing a monitoring method for switching the working states of the clutch and the brake; meanwhile, when the main clutch is combined, the brake is effectively separated, and the safety and reliability of the system are improved.
Further, before the step of collecting and comparing pressure data on the pipelines near the clutch and the brake respectively, the method further comprises the following steps:
the current start-up mode includes: controlling the first end port of the pressure reducing valve to be communicated with the third end port of the pressure reducing valve, and controlling the first end port of the hydraulic control valve to be communicated with the third end port of the hydraulic control valve, so that the brake is in a clamping braking state;
in the starting mode, simultaneously controlling a first end port of the proportional pressure reducing valve to be closed, and a second end port of the proportional pressure reducing valve to be communicated with a third end port of the proportional pressure reducing valve, so that the clutch is in a separation state;
current clutch engagement modes include: the first end port of the proportional pressure reducing valve is controlled to be communicated with the third end port of the proportional pressure reducing valve through a first electric signal, the valve core of the hydraulic control valve is driven by the oil pressure output by the proportional pressure reducing valve, so that the first end port of the hydraulic control valve is closed, and the second end port of the hydraulic control valve is controlled to be communicated with the third end port of the hydraulic control valve, so that the brake is in a released state;
The proportional pressure reducing valve is controlled to drive the clutch to be combined through a second electric signal;
the current clutch release modes include: controlling the first end port of the proportional pressure reducing valve to be closed, and controlling the second end port of the proportional pressure reducing valve to be communicated with the third end port of the proportional pressure reducing valve so that the clutch is in a separation state;
meanwhile, a first end port of the pressure reducing valve is controlled to be communicated with a third end port of the pressure reducing valve, and a first end port of the hydraulic control valve is controlled to be communicated with the third end port of the hydraulic control valve, so that the brake is in a clamping braking state.
By designing the control strategy, the control system generates corresponding control instructions according to the specific working modes, so that corresponding valves of the control system are controlled to perform corresponding work, the expected working modes are realized, and the automation of the system is improved.
Further, the step of judging whether the clutch and the brake work normally according to the comparison result includes:
under the current starting mode, comparing the brake pressure value detected by the second sensor with a first preset pressure value, and comparing the clutch pressure value detected by the first sensor with a second preset pressure value;
When the pressure value of the brake is larger than the first preset pressure value and the pressure value of the clutch is smaller than the second preset pressure value, normal operation of the clutch and the brake is indicated;
when the pressure value of the brake is smaller than or equal to the first preset pressure value or the pressure value of the clutch is larger than or equal to the second preset pressure value, controlling the alarm equipment to perform alarm work;
or alternatively, the first and second heat exchangers may be,
under the current clutch combination mode, comparing the brake pressure value detected by the second sensor with a third preset pressure value, and comparing the clutch pressure value detected by the first sensor with a range from a fourth preset pressure value to a fifth preset pressure value;
when the brake pressure value is smaller than the third preset pressure value and the clutch pressure value is in the range from the fourth preset pressure value to the fifth preset pressure value, normal operation of the clutch and the brake is indicated;
when the brake pressure value is greater than or equal to the third preset pressure value or the clutch pressure value is out of the range from the fourth preset pressure value to the fifth preset pressure value, controlling the alarm device to perform alarm work;
Or alternatively, the first and second heat exchangers may be,
under the current clutch release mode, comparing the brake pressure value detected by the second sensor with a sixth preset pressure value, and comparing the clutch pressure value detected by the first sensor with a seventh preset pressure value;
when the brake pressure value is larger than the sixth preset pressure value and the clutch pressure value is smaller than the seventh preset pressure value, normal operation of the clutch and the brake is indicated;
and when the pressure value of the brake is smaller than or equal to the sixth preset pressure value or the pressure value of the clutch is larger than or equal to the seventh preset pressure value, controlling the alarm equipment to perform alarm work.
Under a specific working mode, comparing the pressure detected by the sensor with a corresponding preset value in the controller, and judging whether the clutch and the brake work normally or not. And when the system works normally, a normal control strategy is kept, and when the system works abnormally, the controller controls the alarm equipment to carry out alarm processing, so that the safety and the reliability of the system are improved.
Further, in the current clutch engagement mode, when the brake pressure value is smaller than the third preset pressure value and the clutch pressure value is within the range from the fourth preset pressure value to the fifth preset pressure value, continuously controlling the proportional pressure reducing valve to operate for a first preset time through a first electric signal;
In the process of controlling the proportional pressure reducing valve to drive the clutch to be combined through a second electric signal, at least one of the following steps is executed:
when the pressure value of the brake is smaller than the third preset pressure value, controlling the alarm equipment to alarm the hydraulic control valve fault;
when the pressure value of the brake is smaller than the third preset pressure value and the pressure value of the clutch is smaller than the fourth preset pressure value, normal operation of the clutch and the brake is indicated;
when the brake pressure value is smaller than the third preset pressure value and the clutch pressure value is larger than the fifth preset pressure value, controlling the alarm device to alarm against a fault of a proportional pressure reducing valve;
and when the pressure value of the brake is larger than the third preset pressure value, controlling the alarm equipment to alarm the hydraulic control valve fault.
Under the clutch combination mode, the proportional pressure reducing valve is continuously controlled through a first electric signal to drive the hydraulic control valve to move so as to separate the brake, the clutch is continuously controlled through a second electric signal to combine, the pressure in the system is detected and analyzed in real time at different stages, the specific part is judged to have faults according to different analysis results, and the user is informed of the specific fault part and fault reasons through the alarm equipment, so that the intelligent degree of automatic control of the system is improved.
Further, in the clutch release mode,
and when the pressure value of the brake is smaller than or equal to the sixth preset pressure value, controlling the alarm equipment to alarm the hydraulic control valve fault.
And in the clutch release mode, detecting and analyzing the pressure in the system in real time, judging which part has faults according to different analysis results, informing a user of the specific fault part and fault reasons through alarm equipment, and improving the intelligent degree of automatic control of the system.
As shown in fig. 1 to 2, fig. 1 is a schematic structural diagram of a monitoring system for switching working states of a clutch and a brake according to an embodiment of the present invention. Fig. 2 is a schematic circuit diagram of a monitoring system for switching working states of a clutch and a brake according to an embodiment of the present invention.
In addition, the invention also provides a monitoring system for switching working states of the clutch and the brake, which comprises the following components: a control device for switching the clutch and brake operation modes, a first sensor 8 for collecting clutch line pressure data, a second sensor 9 for collecting brake line pressure data and a controller,
the first sensor 8 and the second sensor 9 are respectively connected with the controller;
The controller is used for comparing the pressure data on the pipelines close to the clutch 7 and the brake 4;
it is determined whether the clutch 7 and the brake 4 are operating normally or not based on the comparison result.
The clutch is separated when the brake is braked by designing a monitoring system for switching the working states of the clutch and the brake; meanwhile, when the main clutch is combined, the brake is effectively separated, and the safety and reliability of the system are improved.
In addition, the invention also provides a clutch and brake switching hydraulic system and a control method, which optimize the existing hydraulic system, thereby realizing clutch and separation when a brake brakes; meanwhile, when the main clutch is combined, the brake is effectively separated, and meanwhile, a flexible control strategy is provided, so that the brake has the characteristics of unique alarm function, practicality, safety and reliability.
The invention provides a hydraulic control system, which is shown in figure 1 and comprises a pressure reducing valve, a proportional pressure reducing valve, a hydraulic control valve, a pressure sensor and corresponding auxiliary elements (rubber pipes, joints and the like).
The present invention is described in further detail below in conjunction with fig. 1.
Working condition one: after the system is started, the proportional pressure reducing valve is powered off and is in an initial state, P-port pressure oil enters a brake cylinder cavity through the pressure reducing valve (1) to (3) and then enters the brake cylinder cavity through the hydraulic control valve (1) to (3), and the brake is in a clamping state. Meanwhile, if the electric proportional pressure reducing valve is not electrified, the opening (1) of the valve is closed, the openings (2) and (3) of the valve are communicated with the oil tank, and the clutch is in a separation state. The hydraulic pressure sensor P2 (i.e., the second sensor) collects a brake pressure signal, and performs control judgment as to whether the pressure is satisfied or not compared with the threshold value 1 (i.e., the first preset pressure value, which is slightly smaller than the pressure of the pressure reducing valve set by the system, avoiding erroneous judgment) set by the controller. Whether the pressure sensor P1 (i.e. the first sensor) collects pressure less than a set threshold 2 (i.e. a second preset pressure value, which is generally set to be slightly greater than zero, so as to prevent erroneous judgment caused by oil return back pressure) and whether the main clutch is separated.
Working condition II: when the main clutch combination control is operated, the electric proportional pressure reducing valve needs to be electrified, and according to program setting, a small electric signal is firstly applied to enable the electric proportional pressure reducing valve (1) to (3) (representing port) to be electrified with small pressure oil until the pressure reaches the valve core of the push hydraulic control valve, so that the ports (2) and (3) of the hydraulic control valve (1) are closed, the ports (2) and (3) are communicated to an oil tank, and a braking cavity is unloaded and is released. And continuously increasing the electric signal to enable the main clutch to be combined slowly, continuously controlling by using a slope signal to enable the pressure to be increased after the electric proportional pressure reducing valve until the main clutch is combined completely, and finally enabling the main clutch to reach a set pressure value to realize sufficient torque transmission.
Compared with the controller set threshold 3 (namely a third preset pressure value, which is generally set to be slightly larger than zero, so as to prevent erroneous judgment caused by the back pressure of oil return), the hydraulic pressure sensor P2 collects brake pressure signals, and meanwhile, the pressure sensor P1 collects whether the pressure is between the set threshold 4 (namely a fourth preset pressure value, the full opening pressure of a valve core of a hydraulic control valve) and the threshold 5 (namely a fifth preset pressure value, and the critical pressure of clutch energy transmission torque). There are several cases:
(1) If the set requirement is met, the system runs continuously for a few seconds in the state, the system is ensured to achieve switching of main clutch combination and complete brake separation, and then the electric proportional pressure reducing valve is controlled by a slope signal, so that the main clutch finally achieves the set torque transmission requirement.
(2) If the P2 signal is not less than the threshold 3, and the pressure sensor P1 collects pressure between the set threshold 4 (the valve core full opening pressure of the hydraulic control valve) and the threshold 5 (the critical pressure of the main clutch energy transmission torque), the electric proportional pressure reducing valve is kept in the constant current state, a certain threshold can be set for the duration (30 s can be set according to actual adjustment), if the P2 value is less than the threshold 3 after the state, the spring force of the hydraulic control valve is larger, the valve core fails to act in place, or if certain clamping stagnation exists, the valve core acts insensitively, and alarm reminding is performed.
(3) If the P2 signal is smaller than the threshold value 3 and the pressure collected by the pressure sensor P1 is smaller than the set threshold value 4 (the valve core full opening pressure of the hydraulic control valve), the fact that the valve core spring of the existing hydraulic control valve is smaller is indicated, and the use is not affected.
(4) If the P2 signal is smaller than the threshold 3, and the pressure sensor P1 collects that the pressure is greater than the set threshold 5 (the pressure near the main clutch energy transmission torque), it indicates that the electro-proportional pressure reducing valve may have a certain fault, and even if the program has a certain BUG. And (5) alarming and reminding.
(5) If the P2 signal is smaller than the threshold 3, and the pressure sensor P1 collects whether the pressure is between the set threshold 4 (the valve core full opening pressure of the hydraulic control valve) and the threshold 5 (the critical pressure of the clutch energy transmission torque), the electro-proportional pressure reducing valve is kept in the constant current state, a certain threshold (30 s can be set according to actual adjustment) can be set for the duration, if the P2 value is still greater than the threshold 3 after the state, the valve core is possibly completely stuck, or the spring force of the hydraulic control valve is too large, and the valve core cannot act. The alert is sent.
Only after (1) is satisfied, the signal of the system electric proportional valve is allowed to increase to a maximum value in a ramp signal according to program setting.
And (3) working condition III: and operating the main clutch release control, wherein the proportional pressure reducing valve is powered off, and the step mutation is set in a program to quickly unload. At the moment, when the pressure of the main clutch cavity is rapidly reduced, the valve core of the hydraulic control valve acts with a certain delay, after the main clutch pressure is basically completely unloaded, the pressure oil is consistent with the oil flow direction of the first working condition, meanwhile, the clutch pressure is rapidly returned to the oil tank through the port of the proportional pressure reducing valve (3) to (2), the main clutch is separated, and the pressure is from the pressure reducing valve to the hydraulic control valve (1) to (3), so that the system brake disc clamps and brakes.
The hydraulic pressure sensor P2 collects a braking pressure signal, whether the braking pressure signal is larger than a set threshold 6 (smaller than the maximum pressure after the pressure reducing valve) of the controller, and meanwhile, the pressure sensor P1 collects whether the pressure is smaller than a set threshold 7 (generally, a point slightly larger than zero is set, so that misjudgment caused by oil return back pressure is prevented). There are several cases:
(1) If the set requirements are met, the system is indicated to be well operated.
(2) If the P2 signal is not greater than the threshold 6 (namely, the sixth preset pressure value is slightly smaller than the maximum pressure after the pressure reducing valve), the hydraulic control valve is blocked, the braking cannot be released, and an alarm prompt is carried out.
The beneficial effects of the invention are mainly shown in the following steps: 1. the optimal matching of main clutch combination, separation and braking is realized; 2. the system is safe and reliable. 3. The invention discloses an optimal matching device for main clutch separation, combination and braking, which can realize slow combination and fast separation action switching. 4. According to the hydraulic pressure and control strategy disclosed by the invention, through the signal acquisition, analysis and processing functions, the hydraulic system is in a good running state, so that possible burning faults are avoided, and the action is safer and more reliable.
Further, the control device includes: the pressure reducing valve 1, the proportional pressure reducing valve 2 and the hydraulic control valve 3 are respectively connected with the controller;
the first end port of the proportional pressure reducing valve 2 is connected with a first pipeline 10, the second end port of the proportional pressure reducing valve 2 is connected with an oil tank 6 through a pipeline, the third end port of the proportional pressure reducing valve 2 is connected with the input end of an oil cylinder of the clutch 7 through a pipeline, the first sensor 8 is arranged on the pipeline between the proportional pressure reducing valve 2 and the oil cylinder of the clutch 7, and the first sensor 8 is used for detecting the pressure in the pipeline;
The first end port of the pressure reducing valve 1 is connected with a first pipeline 10, the second end port of the pressure reducing valve 1 is connected with the oil tank 6 through a pipeline, the third end port of the pressure reducing valve 1 is connected with the first end port of the hydraulic control valve 3 through a pipeline, the second end port of the hydraulic control valve 3 is connected with the oil tank 6 through a pipeline, and the third end port of the hydraulic control valve 3 is connected with the input end of an oil cylinder of the brake 4 through a pipeline; the valve core of the hydraulic control valve 3 is connected with the proportional pressure reducing valve 2 and the oil cylinder of the clutch 7 through a pipeline, and is used for pushing the valve core of the hydraulic control valve 3 to move by utilizing the pressure in the pipeline between the proportional pressure reducing valve 2 and the clutch 7; the second sensor 9 is arranged between the hydraulic control valve 3 and the oil cylinder of the brake 4, and the second sensor 9 is used for detecting the pressure in a pipeline.
The first line 10 is a line arranged between the hydraulic oil pump and the pressure-reducing valve 1, and is used for pressing hydraulic oil in the oil pump into the pressure-reducing valve 1.
Wherein the proportional pressure reducing valve 2 is an electric proportional pressure reducing valve.
The pressure states of the clutch and the brake are detected in real time through the sensor, and the controller analyzes and processes the pressure states, so that the safety and reliability of the system are improved.
The controller controls the pressure reducing valve, the proportional pressure reducing valve and the hydraulic control valve to work through electric signals according to the working mode input by a user;
the first sensor and the second sensor collect pressure data of the pipeline where the first sensor and the second sensor are located, and the pressure data are transmitted to the controller;
the controller is used for comparing pressure data on a pipeline close to the clutch and the brake;
and judging whether the clutch and the brake work normally or not according to the comparison result.
The step that the controller carries out work through the electrical signal control relief valve, proportion relief valve and hydraulically controlled valve according to the mode of operation of user input includes:
in a system starting mode, a controller controls a first end port of the pressure reducing valve to be communicated with a third end port of the pressure reducing valve, and controls a first end port of the hydraulic control valve to be communicated with the third end port of the hydraulic control valve, so that a brake is in a clamping braking state;
meanwhile, the controller controls the first end port of the proportional pressure reducing valve to be closed, and the second end port of the proportional pressure reducing valve is communicated with the third end port of the proportional pressure reducing valve, so that the clutch is in a separation state;
under a clutch combination mode, a controller controls a first end port of the proportional pressure reducing valve to be communicated with a third end port of the proportional pressure reducing valve through a first electric signal, a valve core of the hydraulic control valve is driven by oil pressure output by the proportional pressure reducing valve, so that the first end port of the hydraulic control valve is closed, and a second end port of the pressure reducing valve is controlled to be communicated with the third end port of the pressure reducing valve, so that a brake is in a released state;
The controller controls the proportional pressure reducing valve to drive the clutch to be combined through a second electric signal;
in a clutch release mode, the controller controls the first end port of the proportional pressure reducing valve to be closed, and the second end port of the proportional pressure reducing valve to be communicated with the third end port of the proportional pressure reducing valve, so that the clutch is in a separation state;
meanwhile, the controller controls the first end port of the pressure reducing valve to be communicated with the third end port of the pressure reducing valve, and controls the first end port of the hydraulic control valve to be communicated with the third end port of the hydraulic control valve, so that the brake is in a clamping braking state.
The controller compares the data acquired by the first pressure sensor and the second pressure sensor respectively to judge whether the oil cylinder of the clutch and the brake oil cylinder work normally or not, and the method comprises the following steps:
in a system starting mode, the controller compares the brake pressure value detected by the second sensor with a first preset pressure value stored in the controller, and compares the clutch pressure value detected by the first sensor with a second preset pressure value stored in the controller;
when the pressure value of the brake is larger than the first preset pressure value and the pressure value of the clutch is smaller than the second preset pressure value, normal operation of the clutch and the brake is indicated;
When the pressure value of the brake is smaller than or equal to the first preset pressure value or the pressure value of the clutch is larger than or equal to the second preset pressure value, the controller controls the alarm equipment to perform alarm work;
in a clutch combination mode, the controller compares the brake pressure value detected by the second sensor with a third preset pressure value stored in the controller, and compares the clutch pressure value detected by the first sensor with a range from a fourth preset pressure value stored in the controller to a fifth preset pressure value;
when the brake pressure value is smaller than the third preset pressure value and the clutch pressure value is in the range from the fourth preset pressure value to the fifth preset pressure value, normal operation of the clutch and the brake is indicated;
when the brake pressure value is greater than or equal to the third preset pressure value or the clutch pressure value is out of the range from the fourth preset pressure value to the fifth preset pressure value, the controller controls the alarm device to perform alarm work;
in a clutch release mode, the controller compares the brake pressure value detected by the second sensor with a sixth preset pressure value stored in the controller, and compares the clutch pressure value detected by the first sensor with a seventh preset pressure value stored in the controller;
When the brake pressure value is larger than the sixth preset pressure value and the clutch pressure value is smaller than the seventh preset pressure value, normal operation of the clutch and the brake is indicated;
and when the pressure value of the brake is smaller than or equal to the sixth preset pressure value or the pressure value of the clutch is larger than or equal to the seventh preset pressure value, the controller controls the alarm device to perform alarm work.
In a clutch combination mode, when the brake pressure value is smaller than the third preset pressure value and the clutch pressure value is in a range from the fourth preset pressure value to the fifth preset pressure value, the controller continuously controls the proportional pressure reducing valve to operate for a first preset time through a first electric signal;
in the process that the controller controls the proportional pressure reducing valve to drive the clutch to be combined through a second electric signal:
when the pressure value of the brake is smaller than the third preset pressure value, the controller controls the alarm device to alarm the hydraulic control valve fault;
when the pressure value of the brake is smaller than the third preset pressure value and the pressure value of the clutch is smaller than the fourth preset pressure value, normal operation of the clutch and the brake is indicated;
When the brake pressure value is smaller than the third preset pressure value and the clutch pressure value is larger than the fifth preset pressure value, the controller controls the alarm device to alarm against the fault of the proportional pressure reducing valve;
and when the pressure value of the brake is larger than the third preset pressure value, the controller controls the alarm device to alarm the hydraulic control valve fault.
In the clutch release mode of the vehicle,
and when the pressure value of the brake is smaller than or equal to the sixth preset pressure value, the controller controls the alarm device to alarm the hydraulic control valve fault.
Further, the method further comprises the following steps: and the alarm device is connected with the controller.
And the alarm device is used for timely alarming to a user when the clutch or the brake works abnormally.
Further, the method further comprises the following steps: the first sensor 8 and the second sensor 9 are pressure sensors or flow sensors.
The pressure in the system is detected through the sensor, whether the working state of the system is normal is detected, and the safety and reliability of the system are improved.
Further, the first sensor 8, the second sensor 9, the alarm device and the controller are in communication connection through a CAN bus.
Signal transmission between the electrical parts is facilitated, and accuracy of detection results is improved.
As shown in fig. 2, the core of the present invention is to provide a clutch brake switching hydraulic system and control with high reliability. The signals of the pressure sensor 1 and the pressure sensor 3 are communicated through CAN, analyzed and processed by the controller, and then the control strategy is output to perform corresponding control or output corresponding alarm signals.
As an alternative to the above-described solutions: alternative scheme one: the pressure sensor shown includes, but is not limited to, a pressure sensor capable of converting a current signal or a voltage signal. Alternative scheme II: the alarm includes alarm information not limited to audible, visual and screen cues. An alternative scheme III: the description of the present invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, and to enable others of ordinary skill in the art to understand the invention for various embodiments with various modifications as are suited to the particular use contemplated.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. A method for monitoring a clutch and brake switching operating condition, comprising: the current start-up mode includes: the first end port of the control pressure reducing valve is communicated with the third end port of the pressure reducing valve, and the first end port of the control hydraulic control valve is communicated with the third end port of the hydraulic control valve, so that the brake is in a clamping braking state; in the starting mode, simultaneously controlling a first end port of the proportional pressure reducing valve to be closed, and a second end port of the proportional pressure reducing valve to be communicated with a third end port of the proportional pressure reducing valve, so that the clutch is in a separation state; current clutch engagement modes include: the first end port of the proportional pressure reducing valve is controlled to be communicated with the third end port of the proportional pressure reducing valve through a first electric signal, the valve core of the hydraulic control valve is driven by the output oil pressure of the proportional pressure reducing valve, so that the first end port of the hydraulic control valve is closed, and the second end port of the pressure reducing valve is controlled to be communicated with the third end port of the pressure reducing valve, so that the brake is in a released state; the proportional pressure reducing valve is controlled to drive the clutch to be combined through a second electric signal; the current clutch release modes include: controlling the first end port of the proportional pressure reducing valve to be closed, and controlling the second end port of the proportional pressure reducing valve to be communicated with the third end port of the proportional pressure reducing valve so that the clutch is in a separation state; simultaneously, a first end port of the pressure reducing valve is controlled to be communicated with a third end port of the pressure reducing valve, and a first end port of the hydraulic control valve is controlled to be communicated with the third end port of the hydraulic control valve, so that the brake is in a clamping braking state; respectively collecting and comparing pressure data on pipelines close to the clutch and the brake;
Judging whether the clutch and the brake work normally or not according to the comparison result;
the step of judging whether the clutch and the brake work normally according to the comparison result comprises the following steps:
under the current starting mode, comparing the brake pressure value detected by the second sensor with a first preset pressure value, and comparing the clutch pressure value detected by the first sensor with a second preset pressure value;
when the pressure value of the brake is larger than the first preset pressure value and the pressure value of the clutch is smaller than the second preset pressure value, normal operation of the clutch and the brake is indicated;
when the pressure value of the brake is smaller than or equal to the first preset pressure value or the pressure value of the clutch is larger than or equal to the second preset pressure value, controlling alarm equipment to perform alarm work;
or alternatively, the first and second heat exchangers may be,
under the current clutch combination mode, comparing the brake pressure value detected by the second sensor with a third preset pressure value, and comparing the clutch pressure value detected by the first sensor with a range from a fourth preset pressure value to a fifth preset pressure value;
when the brake pressure value is smaller than the third preset pressure value and the clutch pressure value is in the range from the fourth preset pressure value to the fifth preset pressure value, normal operation of the clutch and the brake is indicated;
When the brake pressure value is greater than or equal to the third preset pressure value or the clutch pressure value is out of the range from the fourth preset pressure value to the fifth preset pressure value, controlling alarm equipment to perform alarm work;
or alternatively, the first and second heat exchangers may be,
under the current clutch release mode, comparing the brake pressure value detected by the second sensor with a sixth preset pressure value, and comparing the clutch pressure value detected by the first sensor with a seventh preset pressure value by the controller;
when the brake pressure value is larger than the sixth preset pressure value and the clutch pressure value is smaller than the seventh preset pressure value, normal operation of the clutch and the brake is indicated;
and when the pressure value of the brake is smaller than or equal to the sixth preset pressure value or the pressure value of the clutch is larger than or equal to the seventh preset pressure value, controlling the alarm device to perform alarm work.
2. A method for monitoring the switching operation state of a clutch and a brake according to claim 1, wherein,
under the current clutch combination mode, when the brake pressure value is smaller than the third preset pressure value and the clutch pressure value is in the range from the fourth preset pressure value to the fifth preset pressure value, continuously controlling the proportional pressure reducing valve to operate for a first preset time through a first electric signal;
In the process of controlling the proportional pressure reducing valve to drive the clutch to be combined through a second electric signal, at least one of the following steps is executed:
when the pressure value of the brake is smaller than the third preset pressure value, controlling the alarm equipment to alarm the hydraulic control valve fault;
when the pressure value of the brake is smaller than the third preset pressure value and the pressure value of the clutch is smaller than the fourth preset pressure value, normal operation of the clutch and the brake is indicated;
when the brake pressure value is smaller than the third preset pressure value and the clutch pressure value is larger than the fifth preset pressure value, controlling the alarm device to alarm against a fault of a proportional pressure reducing valve;
and when the pressure value of the brake is larger than the third preset pressure value, controlling the alarm equipment to alarm the hydraulic control valve fault.
3. The method for monitoring a switching operation state of a clutch and a brake according to claim 2, wherein the alarm device is controlled to alarm a malfunction of a pilot operated valve when the brake pressure value is less than or equal to the sixth preset pressure value in a clutch release mode.
4. A system for monitoring the switching of the operating state of a clutch and brake, comprising: a control device for switching the clutch and brake operation modes, a first sensor, a second sensor and a controller,
The first sensor and the second sensor are respectively connected with the controller;
the control device includes: a pressure reducing valve, a proportional pressure reducing valve and a hydraulic control valve,
the pressure reducing valve, the proportional pressure reducing valve and the hydraulic control valve are respectively connected with the controller;
the first end port of the proportional pressure reducing valve is connected with a first pipeline, the second end port of the proportional pressure reducing valve is connected with an oil tank through a pipeline, the third end port of the proportional pressure reducing valve is connected with the input end of an oil cylinder of a clutch through a pipeline, and the first sensor is arranged on the pipeline between the proportional pressure reducing valve and the oil cylinder of the clutch;
the first end port of the pressure reducing valve is connected with a first pipeline, the second end port of the pressure reducing valve is connected with the oil tank through a pipeline, the third end port of the pressure reducing valve is connected with the first end port of the hydraulic control valve through a pipeline, the second end port of the hydraulic control valve is connected with the oil tank through a pipeline, and the third end port of the hydraulic control valve is connected with the input end of an oil cylinder of the brake through a pipeline; the valve core of the hydraulic control valve is connected with a pipeline between the proportional pressure reducing valve and the oil cylinder of the clutch through a pipeline, and is used for pushing the valve core of the hydraulic control valve to move by utilizing the pressure in the pipeline between the proportional pressure reducing valve and the clutch; the second sensor is arranged between the hydraulic control valve and the brake oil cylinder;
The first sensor is used for collecting pressure data of a pipeline close to the clutch;
the second sensor is used for acquiring pressure data of a pipeline close to the brake;
the controller is used for comparing pressure data on a pipeline close to the clutch and the brake;
the controller is also used for judging whether the clutch and the brake work normally or not according to the comparison result;
the controller is further used for comparing the brake pressure value detected by the second sensor with a first preset pressure value and comparing the clutch pressure value detected by the first sensor with a second preset pressure value in a current starting mode;
when the pressure value of the brake is larger than the first preset pressure value and the pressure value of the clutch is smaller than the second preset pressure value, normal operation of the clutch and the brake is indicated;
the controller is further used for controlling the alarm device to alarm when the pressure value of the brake is smaller than or equal to the first preset pressure value or the pressure value of the clutch is larger than or equal to the second preset pressure value;
or alternatively, the first and second heat exchangers may be,
the controller is further configured to compare the brake pressure value detected by the second sensor with a third preset pressure value and compare the clutch pressure value detected by the first sensor with a range from a fourth preset pressure value to a fifth preset pressure value in a current clutch coupling mode;
When the brake pressure value is smaller than the third preset pressure value and the clutch pressure value is in the range from the fourth preset pressure value to the fifth preset pressure value, normal operation of the clutch and the brake is indicated;
the controller is further used for controlling the alarm device to perform alarm work when the brake pressure value is greater than or equal to the third preset pressure value or the clutch pressure value is out of the range from the fourth preset pressure value to the fifth preset pressure value;
or alternatively, the first and second heat exchangers may be,
the controller is further used for comparing the brake pressure value detected by the second sensor with a sixth preset pressure value in a current clutch release mode, and comparing the clutch pressure value detected by the first sensor with a seventh preset pressure value;
when the brake pressure value is larger than the sixth preset pressure value and the clutch pressure value is smaller than the seventh preset pressure value, normal operation of the clutch and the brake is indicated;
the controller is further used for controlling the alarm device to perform alarm work when the pressure value of the brake is smaller than or equal to the sixth preset pressure value or the pressure value of the clutch is larger than or equal to the seventh preset pressure value;
The current start-up mode includes: the first end port of the control pressure reducing valve is communicated with the third end port of the pressure reducing valve, and the first end port of the control hydraulic control valve is communicated with the third end port of the hydraulic control valve, so that the brake is in a clamping braking state; in the starting mode, simultaneously controlling a first end port of the proportional pressure reducing valve to be closed, and a second end port of the proportional pressure reducing valve to be communicated with a third end port of the proportional pressure reducing valve, so that the clutch is in a separation state; current clutch engagement modes include: the first end port of the proportional pressure reducing valve is controlled to be communicated with the third end port of the proportional pressure reducing valve through a first electric signal, the valve core of the hydraulic control valve is driven by the output oil pressure of the proportional pressure reducing valve, so that the first end port of the hydraulic control valve is closed, and the second end port of the pressure reducing valve is controlled to be communicated with the third end port of the pressure reducing valve, so that the brake is in a released state; the proportional pressure reducing valve is controlled to drive the clutch to be combined through a second electric signal; the current clutch release modes include: controlling the first end port of the proportional pressure reducing valve to be closed, and controlling the second end port of the proportional pressure reducing valve to be communicated with the third end port of the proportional pressure reducing valve so that the clutch is in a separation state; meanwhile, a first end port of the pressure reducing valve is controlled to be communicated with a third end port of the pressure reducing valve, and a first end port of the hydraulic control valve is controlled to be communicated with the third end port of the hydraulic control valve, so that the brake is in a clamping braking state.
5. The clutch and brake shift operating condition monitoring system of claim 4, further comprising: and the alarm device is connected with the controller.
6. The system of claim 4, wherein the first sensor, the second sensor, the alarm device and the controller are connected by a CAN bus.
7. A clutch and brake shift operating condition monitoring system according to any one of claims 4-6, wherein said first sensor and said second sensor are pressure sensors or flow sensors.
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| CN201910646882.1A CN110219916B (en) | 2019-07-17 | 2019-07-17 | Monitoring method and system for switching working states of clutch and brake |
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| CN201910646882.1A CN110219916B (en) | 2019-07-17 | 2019-07-17 | Monitoring method and system for switching working states of clutch and brake |
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| CN110219916B true CN110219916B (en) | 2024-02-06 |
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| CN111550512B (en) * | 2020-05-12 | 2021-08-24 | 深圳市科敏传感器有限公司 | Train brake cylinder pressure monitoring and collecting system |
| CN112377545B (en) * | 2020-11-26 | 2022-02-08 | 东风井关农业机械有限公司 | Fault diagnosis method for vehicle wet-type multi-plate clutch system |
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