CN113655426A - Test equipment and method for detecting TFT instrument - Google Patents
Test equipment and method for detecting TFT instrument Download PDFInfo
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- CN113655426A CN113655426A CN202110942440.9A CN202110942440A CN113655426A CN 113655426 A CN113655426 A CN 113655426A CN 202110942440 A CN202110942440 A CN 202110942440A CN 113655426 A CN113655426 A CN 113655426A
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 23
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- 230000002457 bidirectional effect Effects 0.000 claims abstract description 5
- 238000010998 test method Methods 0.000 claims description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
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Abstract
The invention discloses a test device and a method for detecting a TFT instrument, which comprises a current detection module, a judgment module and a control module, wherein the current detection module and the judgment module are respectively connected with the control module in a bidirectional way; the current detection module is used for detecting the real-time current of the TFT instrument; and the judging module is used for judging whether the TFT instrument has a fault or not and sending a judgment result to the control module. According to the invention, the test equipment sends the operation signal and the CAN signal for a long time and performs abnormal power-on and power-off operation to the TFT instrument for detection, and whether the MCU of the instrument works normally or not and whether the LED screen is black or not are judged after the operation, so that the delivery quality of the TFT is improved, and better experience is brought to users.
Description
Technical Field
The invention relates to the technical field of instrument detection, in particular to a test device and a method for detecting a TFT instrument.
Background
With the progress of society and the development of technology, vehicles have entered into people's lives, TFT meters are used as parts of vehicles to play an important role in displaying information of vehicles, such as speed, oil quantity, rotating speed and the like, during driving, and therefore, the quality requirements for TFT meters are higher and higher.
In the prior art, a TFT instrument is generally arranged on a vehicle to operate for a period of time, and whether a fault occurs or not is judged, but time is wasted, and the quality is not completely detected, so that great potential safety hazards exist.
Disclosure of Invention
Aiming at the problem of lower quality detection efficiency of a TFT instrument in the prior art, the invention provides a test device and a method for detecting the TFT instrument.
In order to achieve the purpose, the invention provides the following technical scheme:
a test device for detecting a TFT instrument comprises a current detection module, a judgment module and a control module, wherein the current detection module and the judgment module are respectively connected with the control module in a bidirectional way;
the current detection module is used for detecting the real-time current of the TFT instrument; and the judging module is used for judging whether the TFT instrument has a fault or not and sending a judgment result to the control module.
Preferably, the device also comprises a storage module, a signal sending module and a signal receiving module which are respectively connected with the control module in a bidirectional way;
the storage module is used for storing the current value, the limit value and the standard feedback signal; the signal sending module is used for sending an operation signal and a CAN signal to the TFT instrument; and the signal receiving module is used for receiving the current value and the feedback signal returned by the TFT instrument.
Preferably, the device also comprises a display screen and an alarm module which are respectively connected with the control module in a bidirectional way;
the display screen is used for displaying 'NG' or 'OK' according to the judgment result of the judgment module; and the alarm module is used for sending out an alarm prompt when the display screen displays 'NG'.
The invention also provides a test method for detecting the TFT instrument, which comprises test equipment and specifically comprises the following steps:
s1: connecting a TFT instrument to be tested with test equipment;
s2: the testing equipment sends a first operation signal to the TFT instrument, reads a first current value of the TFT instrument in real time and compares the first current value with a threshold value;
if the first current value is smaller than the threshold value, the testing equipment judges that the TFT instrument has a fault, the display screen displays NG, and the TFT instrument keeps the current state; if the first current value is greater than or equal to the threshold value, the display screen displays 'OK', and the process goes to S3;
s3: the testing equipment sends a first CAN signal to a controller of the TFT instrument, and the controller of the TFT instrument sends a first feedback signal to the testing equipment after receiving the first CAN signal;
if the first feedback signal is different from a standard feedback signal preset on the test equipment, the test equipment judges that the state of a control module of the TFT instrument is abnormal, and a display screen displays 'NG'; if the first feedback signal is the same as the preset standard feedback signal on the test equipment, the display screen displays 'OK', and the process goes to S4;
s4: the test equipment sends a second operation signal to the TFT instrument, and the current detection module reads a second current value of the TFT instrument in real time and compares the second current value with a threshold value;
if the second current value is smaller than the threshold value, the testing equipment judges that the TFT instrument has a fault, the display screen displays NG, and the TFT instrument keeps the current state; if the second current value is larger than or equal to the threshold value, the display screen displays 'OK'.
Preferably, the method further comprises the step of S5:
when the second current value is larger than or equal to the threshold value, the testing equipment sends a second CAN signal to the controller of the TFT instrument again, and the controller of the TFT instrument sends a second feedback signal to the testing equipment after receiving the second CAN signal;
if the second feedback signal is different from a standard feedback signal preset on the test equipment, the test equipment judges that the state of the control module of the TFT instrument is abnormal, and a display screen displays 'NG'; and if the second feedback signal is the same as the preset standard feedback signal on the test equipment, displaying 'OK' on the display screen.
Preferably, the first operation signal is a full lighting signal, which is maintained for 30 minutes or the test equipment sends vehicle speed 240 to 0, rotation speed 8000 to 0 and turn-on/off of the turn signal periodically (2 seconds) in one period (for example, 4 seconds).
Preferably, the second operation signal comprises an abnormal power-on and power-off operation, that is, the test equipment sends a power-on signal to power on the TFT instrument for a certain time T, and then sends a power-off signal to power off the TFT instrument, wherein the power-off duration time is 0.5S each time.
In summary, due to the adoption of the technical scheme, compared with the prior art, the invention at least has the following beneficial effects:
according to the invention, the test equipment sends the operation signal and the CAN signal (simulating CAN data on a real vehicle) for a long time and performs abnormal power-on and power-off operation to the TFT instrument for detection, and whether the MCU of the instrument works normally or not and whether the LED screen is black or not are judged after the operation, so that the delivery quality of the TFT is improved, and better experience is brought to users.
Description of the drawings:
FIG. 1 is a schematic diagram of a testing apparatus for testing a TFT meter according to an exemplary embodiment of the present invention.
Fig. 2 is a flowchart illustrating a testing method for testing a TFT meter according to an exemplary embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples and embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
As shown in fig. 1, the present invention provides a testing apparatus for testing a TFT instrument, which includes a current detection module, a storage module, a determination module, a signal transmission module, a signal reception module, a display screen, an alarm module, and a control module, wherein the current detection module, the storage module, the determination module, the signal transmission module, the signal reception module, the display screen, and the alarm module are respectively connected to the control module in two ways.
The current detection module is used for detecting the real-time current of the TFT instrument; the storage module is used for storing data, including current values, limit values, standard feedback signals and the like; the judgment module is used for judging whether the TFT instrument has a fault according to the threshold value and the standard feedback signal; the signal sending module is used for sending an operation signal and a CAN signal to the TFT instrument; the signal receiving module is used for receiving a current value and a feedback signal returned by the TFT instrument; the display screen is used for displaying 'NG' or 'OK' according to the result of the judging module; the alarm module is used for sending out an alarm prompt when the display screen displays NG; and the control module is used for processing data among the modules.
As shown in fig. 2, the present invention provides a testing method for testing equipment based on a TFT detection instrument, which specifically includes the following steps:
s1: and connecting the TFT instrument with the test equipment, and then operating the test equipment.
S2: the testing equipment reads device information (such as model, specification and the like) of the TFT instrument, the testing equipment sends a first abnormal operation signal to the TFT instrument, and the current detection module reads a first current value of the TFT instrument in real time and compares the first current value with a threshold value.
When the first current value is smaller than the threshold value, the testing equipment judges that the LED screen of the TFT instrument has a fault (such as a black screen), the status indicator lamp of the testing equipment is on red, the display screen displays NG, the buzzer buzzes, the TFT instrument keeps the current status for other personnel to analyze, and after the analysis is finished, the reset button can be pressed, and S1 is repeated to test the next TFT instrument; when the first current value is greater than or equal to the threshold value, the indicator lamp is turned on green, and the display screen displays "OK" to proceed to S3.
In the present embodiment, the first abnormal operation signal is a signal of full lighting (i.e., the signal lights of the meter are all on, such as speed, rotation speed, oil amount, temperature, etc.), and is maintained for 30 minutes. The first abnormal operation signal further includes the test device sending vehicle speed 240 to 0, rotation speed 8000 to 0, and turn signal lights on and off periodically (2 seconds) in one period (e.g., 4 seconds).
S3: the testing equipment sends a CAN signal to a controller of the TFT instrument, and the controller of the TFT instrument sends a feedback signal to the testing equipment after receiving the CAN signal;
if the feedback signal is different from a standard feedback signal preset on the testing equipment, the testing equipment judges that the controller state of the TFT instrument is abnormal, an alarm operation is carried out, an indicator lamp lights a red lamp, a display screen displays 'NG', a buzzer buzzes, the TFT instrument keeps the current state for other personnel to analyze, and after the analysis is finished, a reset button can be pressed, and S1 is repeated to carry out the test of the next instrument; if the feedback signal is the same as the standard feedback signal preset on the test equipment, the indicator light lights the green light, the display screen displays 'OK', and the process goes to S4.
For example, the data of the CAN signal sent by the test equipment to the TFT meter is 0x1, the standard feedback signal preset on the test equipment is 0x2, and if the data of the feedback signal sent back by the TFT meter is 0x0, the test equipment determines that the MCU state of the TFT meter is abnormal.
S4: and the test equipment sends a second abnormal operation signal to the TFT instrument, and the current detection module reads a second current value of the TFT instrument in real time and compares the second current value with a threshold value.
When the second current value is smaller than the threshold value, the testing equipment judges that the TFT instrument is dark, a status indicator lamp of the testing equipment is bright red, a display screen displays NG, a buzzer buzzes to indicate that the TFT instrument breaks down, the TFT instrument keeps the current state for other personnel to analyze, and after the analysis is finished, a reset button can be pressed, and S1 is repeated to test the next TFT instrument; when the second current value is greater than or equal to the threshold value, the indicator lamp is turned on green, the display screen displays "OK", and S3 is repeated. If the display screen displays NG, the buzzer buzzes, the TFT instrument keeps the current state for other personnel to analyze, and after the analysis is finished, the reset button can be pressed, S1 is repeated, and the next instrument is tested; if the display screen displays 'OK', the ODO mileage value is cleared, namely 0,
the second abnormal operation signal comprises abnormal power-on and power-off operations, namely after the test equipment sends a power-on signal to power on the instrument, a power-down signal is sent within a certain time T (starting from 2S and increasing to 4S by 100ms each time), the power-down duration is 0.5S each time, and the duration of the whole step is not less than 20 minutes. This allows the durability of the TFT meter to be verified.
For example, the test equipment sends a power-on signal to the TFT instrument, after the TFT instrument is powered on for 2s for the first time, the test equipment sends a power-off signal to the TFT instrument, and the TFT instrument is powered off for 0.5 s; the test equipment sends a power-on signal to the TFT instrument again, after the power is powered on for 2.1s for the second time, the test equipment sends a power-off signal to the TFT instrument, and the power of the TFT instrument is turned off for 0.5 s.
In this embodiment, other test signals may be sent for detection according to the actual condition of the TFT meter, and S2-S3 may be repeated.
The invention aims to send a CAN signal (simulating CAN data on a real vehicle) to the TFT instrument for a long time through the testing equipment and carry out abnormal power-on and power-off operation, judge whether the MCU of the TFT instrument works normally or not after the operation, and judge whether the LED screen is black or not, thereby improving the quality detection efficiency of the TFT instrument and further improving the quality of the TFT instrument.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (7)
1. A test device for detecting a TFT instrument is characterized by comprising a current detection module, a judgment module and a control module, wherein the current detection module and the judgment module are respectively connected with the control module in a bidirectional way;
the current detection module is used for detecting the real-time current of the TFT instrument; and the judging module is used for judging whether the TFT instrument has a fault or not and sending a judgment result to the control module.
2. The test equipment for detecting the TFT instrument as claimed in claim 1, further comprising a storage module, a signal transmitting module, a signal receiving module which are respectively connected with the control module bidirectionally;
the storage module is used for storing the current value, the limit value and the standard feedback signal; the signal sending module is used for sending an operation signal and a CAN signal to the TFT instrument; and the signal receiving module is used for receiving the current value and the feedback signal returned by the TFT instrument.
3. The test equipment for detecting the TFT instrument as claimed in claim 1, further comprising a display screen and an alarm module which are respectively connected with the control module in two directions;
the display screen is used for displaying 'NG' or 'OK' according to the judgment result of the judgment module; and the alarm module is used for sending out an alarm prompt when the display screen displays 'NG'.
4. A test method for testing a TFT meter, comprising a test apparatus according to any one of claims 1 to 3, comprising the steps of:
s1: connecting a TFT instrument to be tested with test equipment;
s2: the testing equipment sends a first operation signal to the TFT instrument, reads a first current value of the TFT instrument in real time and compares the first current value with a threshold value;
if the first current value is smaller than the threshold value, the testing equipment judges that the TFT instrument has a fault, the display screen displays NG, and the TFT instrument keeps the current state; if the first current value is greater than or equal to the threshold value, the display screen displays 'OK', and the process goes to S3;
s3: the testing equipment sends a first CAN signal to a controller of the TFT instrument, and the controller of the TFT instrument sends a first feedback signal to the testing equipment after receiving the first CAN signal;
if the first feedback signal is different from a standard feedback signal preset on the test equipment, the test equipment judges that the state of a control module of the TFT instrument is abnormal, and a display screen displays 'NG'; if the first feedback signal is the same as the preset standard feedback signal on the test equipment, the display screen displays 'OK', and the process goes to S4;
s4: the test equipment sends a second operation signal to the TFT instrument, and the current detection module reads a second current value of the TFT instrument in real time and compares the second current value with a threshold value;
if the second current value is smaller than the threshold value, the testing equipment judges that the TFT instrument has a fault, the display screen displays NG, and the TFT instrument keeps the current state; if the second current value is larger than or equal to the threshold value, the display screen displays 'OK'.
5. The test method for testing the TFT meter as recited in claim 4, further comprising S5:
when the second current value is larger than or equal to the threshold value, the testing equipment sends a second CAN signal to the controller of the TFT instrument again, and the controller of the TFT instrument sends a second feedback signal to the testing equipment after receiving the second CAN signal;
if the second feedback signal is different from a standard feedback signal preset on the test equipment, the test equipment judges that the state of the control module of the TFT instrument is abnormal, and a display screen displays 'NG'; and if the second feedback signal is the same as the preset standard feedback signal on the test equipment, displaying 'OK' on the display screen.
6. The test method for testing the TFT instrument according to claim 4, wherein the first operation signal is a full lighting signal, the duration is 30 minutes or the test equipment sends a vehicle speed of 240 to 0, a rotation speed of 8000 to 0 and a turn signal lamp to be turned on and off periodically (2 seconds) in one period (e.g. 4 seconds).
7. The test method for detecting the TFT instrument as claimed in claim 4, wherein the second operation signal comprises an abnormal power-up and power-down operation, namely the test device sends a power-up signal to power up the TFT instrument for a certain time T, and then sends a power-down signal to power down the TFT instrument, wherein each power-down duration is 0.5S.
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| CN202110942440.9A CN113655426A (en) | 2021-08-17 | 2021-08-17 | Test equipment and method for detecting TFT instrument |
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| CN202110942440.9A CN113655426A (en) | 2021-08-17 | 2021-08-17 | Test equipment and method for detecting TFT instrument |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH052695A (en) * | 1991-02-04 | 1993-01-08 | Yokogawa Electric Corp | Signal transmitter and signal transmission method |
| CN203224610U (en) * | 2013-05-03 | 2013-10-02 | 绍兴县博菱德电子有限公司 | Motormeter light automatic tester |
| CN207335757U (en) * | 2017-10-19 | 2018-05-08 | 安徽江淮汽车集团股份有限公司 | A kind of test system of automobile combination meter |
| CN108444517A (en) * | 2018-03-21 | 2018-08-24 | 航天科技控股集团股份有限公司 | Portable multi-function Meter Test load test case and instrument detecting method |
| CN110207744A (en) * | 2019-06-27 | 2019-09-06 | 上海仪电汽车电子系统有限公司 | A kind of Meter Test system and method |
-
2021
- 2021-08-17 CN CN202110942440.9A patent/CN113655426A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH052695A (en) * | 1991-02-04 | 1993-01-08 | Yokogawa Electric Corp | Signal transmitter and signal transmission method |
| CN203224610U (en) * | 2013-05-03 | 2013-10-02 | 绍兴县博菱德电子有限公司 | Motormeter light automatic tester |
| CN207335757U (en) * | 2017-10-19 | 2018-05-08 | 安徽江淮汽车集团股份有限公司 | A kind of test system of automobile combination meter |
| CN108444517A (en) * | 2018-03-21 | 2018-08-24 | 航天科技控股集团股份有限公司 | Portable multi-function Meter Test load test case and instrument detecting method |
| CN110207744A (en) * | 2019-06-27 | 2019-09-06 | 上海仪电汽车电子系统有限公司 | A kind of Meter Test system and method |
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