CN102455416A - Self-check system of LED alarm lamp of automobile instrument - Google Patents
Self-check system of LED alarm lamp of automobile instrument Download PDFInfo
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- CN102455416A CN102455416A CN2010105151527A CN201010515152A CN102455416A CN 102455416 A CN102455416 A CN 102455416A CN 2010105151527 A CN2010105151527 A CN 2010105151527A CN 201010515152 A CN201010515152 A CN 201010515152A CN 102455416 A CN102455416 A CN 102455416A
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Abstract
The invention, which relates to the automobile fault detection system, relates to a self-check system of an LED alarm lamp of an automobile instrument. The self-check system is characterized in that: the work process of the system comprises the following steps: an ignition and self-check step is carried out; an LED state reading step is carried out; more particularly, if an LED is broken down and there is a short circuit fault, a detected voltage value is a low level that exceeds a range and a master control chip makes determination according to the detected voltage value; a step of detecting whether the LED is normal or not by carrying out comparison on a storage normal value; more particularly, if it is detected that a state of an LED at any one path or states of more LEDs is/are abnormal, processing is carried out on state information, the processed information is converted into preset fault codes that are DTCs, wherein the preset fault codes are corresponded to all alarm lamps, and the preset fault codes are stored into a plug-in E<2>PROM; and a step of sending CAN; more particularly, a one-chip microcomputer sends a frame of fault code data that are CAN messages to a CAN Bus as well as a corresponded module is informed of information that there is an fault on an alarm lamp. According to the invention, a mated diagnostic apparatus can be used to read a fault code value; and a concrete fault line is searched out according to a fault code list; therefore, investigation work is simplified and time is saved.
Description
Technical field
The present invention relates to fault detection system for automobile, be specifically related to the self-checking system of automobile instrument fault.
Background technology
In the general automobiles instrument; Because warning circuit just just can be worked under the situation that fault takes place; In order to know the state of alarm lamp; Some important alarm lamps can be lighted for 3 seconds when automotive ignition, in this 3 second, whether were lighted the quality of judging these alarm lamps through the visual inspection alarm lamp by the driver.Along with the continuous development of automotive electronics, the quantity of alarm lamp is more and more on the automobile instrument, and the alarm lamp of lighting during the igniting self check is also more and more.Just have in this money instrument that nearly 4 alarm lamps need self check when igniting.Because the alarm lamp of self check is too much, the driver is also noted that other information of vehicles when automotive ignition, be easy to ignore the state of self check alarm lamp.Thereby omit important warning message, make automobile storage in potential safety hazard.In addition, the initiation conditions of a warning circuit cisco unity malfunction has a lot of possibilities.Common instrument will confirm that trouble location needs inspection layer by layer---be that sensor damages, or wire harness have problem, also or instrument panel fault or the like.Such situation has brought very big workload for maintenance personal's maintenance, often will could confirm trouble location through a large amount of investigation work.Therefore, use the testing circuit of a LED alarm lamp that the driver will no longer be concentrated on notice on the self check information of instrument, also eliminated the potential safety hazard of bringing because alarm lamp damages.Simultaneously it also can help the maintenance personal in the maintenance testing process, not only to make judgement fast but also accurately, has reduced the man-hour and the technical requirement of car inspection and repair.
Summary of the invention
The LED alarming lamp self-checking system that the purpose of this invention is to provide a kind of automobile instrument; The invention solves existing because the alarm lamp of self check is too much; And common instrument will confirm that trouble location needs inspection layer by layer, thereby will could confirm the problem of trouble location through a large amount of investigation work.
The LED alarming lamp self-checking system of automobile instrument of the present invention comprises following process:
The igniting self check: instrument has the self check in 3 seconds in igniting ON, and this moment, the LED alarm lamp can be lighted through the analog input of software;
Read led state: if the breakdown short trouble that occurs of LED, then detected magnitude of voltage should be an off-limits low level, and main control chip is made judgement thus;
Whether normal with storage normal value comparison if detecting LED: if detect any one the road or the state of more LED undesired, and status information handled, convert the preset corresponding failure code DTC of each alarm lamp to, and store plug-in E into
2Among the PROM;
Send CAN: last single-chip microcomputer will send a frame failure code data CAN message to CAN Bus, tell the information that corresponding module alarm lamp breaks down.
The LED alarming lamp self-checking system of automobile instrument of the present invention can be through the diagnostic equipment read failure code value of coupling, and finds concrete instrument fault circuit according to failure code tabulation.Simplify investigation work, practiced thrift the time.
Description of drawings
Fig. 1 is a system flowchart of the present invention;
Fig. 2 is red LED tube voltage drop and current curve diagram;
Fig. 3 is White LED tube voltage drop and current curve diagram.
Embodiment
Below in conjunction with accompanying drawing and with illustrated embodiments the present invention is done detailed explanation.
The wafer that the core of LED is made up of p N-type semiconductor N and n N-type semiconductor N has a transition bed between p N-type semiconductor N and n N-type semiconductor N, be called p-n junction.In the PN junction of some semiconductor material, the minority carrier of injection and majority carrier compound tense can discharge the form of unnecessary energy with light, thereby directly convert electric energy into luminous energy.Therefore, LED communicates with common diode principle, and definite " forward conduction voltage drop " is also all arranged on the presentation.Different is because the forward voltage drop of the difference LED on the physical characteristics is high slightly, generally between 1.8-3.5V.We guarantee the electric current (R1-R4 in the schematic diagram) on the LED through joining lamp resistance.Relation between its electric current and the voltage is shown in Fig. 1-2.
Consult Fig. 1, the LED alarming lamp self-checking system of automobile instrument, after current value in the circuit was confirmed, the forward voltage drop of LED was to be stabilized in the very little interval.We utilize this characteristic to detect the quality of our instrument onboard led just.
At first, the igniting self check: instrument has the self check in 3 seconds in igniting ON, and this moment, the LED alarm lamp can be lighted through the analog input of software;
Read led state: when the LED lamp carries out self check (control chip that we select for use is its direct driving LED of NECUPD78F0828A); Send instruction to single-chip microcomputer; His forward voltage when measuring the LED conducting is judged its whether operate as normal, and the detection feedback data.Concrete grammar is following: if LED is intact that constant pressure drop just should be arranged.Our testing circuit just can measure one in scope with interior (can be defined as 1.7V-1.9V is example with the red LED) correct magnitude of voltage.Open circuit fault occurs if LED damages, quilt is burnt, then detected value should be a high level (as: 12V) that exceeds monitoring range; If the breakdown short trouble that occurs of LED, then detected magnitude of voltage should be an off-limits low level (as: 0.7V).Main control chip is made judgement thus.
Whether normal with storage normal value comparison if detecting LED: if detect any one the road or the state of more LED undesired, and status information handled, convert the preset corresponding failure code DTC of each alarm lamp to, and store plug-in E into
2Among the PROM;
Send CAN: last single-chip microcomputer will send a frame failure code data CAN message to CAN Bus, tell the information that corresponding module alarm lamp breaks down.In maintenance process, the user can pass through the diagnostic equipment read failure code value of coupling, and concrete instrument fault circuit is found in tabulation according to failure code.Simplify investigation work, practiced thrift the time.
Characteristic of the present invention: 1. all testing processes are all accomplished by same main control chip through software with coding.2. realize the state of each alarm lamp LED is encoded through software, and be stored in plug-in E
2Among the PROM.
Above embodiment is more preferably embodiment a kind of of the present invention, and common variation that those skilled in the art carry out in present technique scheme scope and replacement should be included in protection scope of the present invention.
Claims (1)
1. the LED alarming lamp self-checking system of automobile instrument is characterized in that, comprises following process:
The igniting self check: instrument has the self check in 3 seconds in igniting ON, and this moment, the LED alarm lamp can be lighted through the analog input of software;
Read led state: if the breakdown short trouble that occurs of LED, then detected magnitude of voltage should be an off-limits low level, and main control chip is made judgement thus;
Whether normal with storage normal value comparison if detecting LED: if detect any one the road or the state of more LED undesired, and status information handled, convert the preset corresponding failure code DTC of each alarm lamp to, and store plug-in E into
2Among the PROM;
Send CAN: last single-chip microcomputer will send a frame failure code data CAN message to CAN Bus, tell the information that corresponding module alarm lamp breaks down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105151527A CN102455416A (en) | 2010-10-20 | 2010-10-20 | Self-check system of LED alarm lamp of automobile instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105151527A CN102455416A (en) | 2010-10-20 | 2010-10-20 | Self-check system of LED alarm lamp of automobile instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102455416A true CN102455416A (en) | 2012-05-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105151527A Pending CN102455416A (en) | 2010-10-20 | 2010-10-20 | Self-check system of LED alarm lamp of automobile instrument |
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| CN (1) | CN102455416A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116139A (en) * | 2013-01-23 | 2013-05-22 | 重庆恒又源科技发展有限公司 | Detection method, detection device and detection system of street lamp failure |
| CN106970282A (en) * | 2017-04-20 | 2017-07-21 | 星光农机股份有限公司 | The ECU apparatus for monitoring working state and monitoring method of a kind of electronic controlled diesel |
| CN107291605A (en) * | 2017-07-11 | 2017-10-24 | 郑州云海信息技术有限公司 | The processing method and system of a kind of system journal |
| CN105890642B (en) * | 2016-04-01 | 2018-06-29 | 湖北工程学院 | Four commercial vehicle instrument external control status indicator lamp automatic detection circuit of state and method |
| CN112078515A (en) * | 2020-08-05 | 2020-12-15 | 东风电驱动系统有限公司 | TFT screen alarm lamp detection method and system |
| CN112078514A (en) * | 2020-08-05 | 2020-12-15 | 东风电驱动系统有限公司 | TFT screen alarm lamp self-checking method and device |
| CN112078364A (en) * | 2020-08-05 | 2020-12-15 | 东风电驱动系统有限公司 | UART-based TFT screen alarm lamp self-checking method and system |
| CN113381874A (en) * | 2020-03-10 | 2021-09-10 | 上海杰之能软件科技有限公司 | Fault signal processing method, storage medium and terminal |
-
2010
- 2010-10-20 CN CN2010105151527A patent/CN102455416A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116139A (en) * | 2013-01-23 | 2013-05-22 | 重庆恒又源科技发展有限公司 | Detection method, detection device and detection system of street lamp failure |
| CN103116139B (en) * | 2013-01-23 | 2016-03-23 | 重庆恒又源科技发展有限公司 | Street lamp fault detection method, pick-up unit and detection system thereof |
| CN105890642B (en) * | 2016-04-01 | 2018-06-29 | 湖北工程学院 | Four commercial vehicle instrument external control status indicator lamp automatic detection circuit of state and method |
| CN106970282A (en) * | 2017-04-20 | 2017-07-21 | 星光农机股份有限公司 | The ECU apparatus for monitoring working state and monitoring method of a kind of electronic controlled diesel |
| CN107291605A (en) * | 2017-07-11 | 2017-10-24 | 郑州云海信息技术有限公司 | The processing method and system of a kind of system journal |
| CN113381874A (en) * | 2020-03-10 | 2021-09-10 | 上海杰之能软件科技有限公司 | Fault signal processing method, storage medium and terminal |
| CN113381874B (en) * | 2020-03-10 | 2023-06-02 | 上海杰之能软件科技有限公司 | Fault signal processing method, storage medium and terminal |
| CN112078515A (en) * | 2020-08-05 | 2020-12-15 | 东风电驱动系统有限公司 | TFT screen alarm lamp detection method and system |
| CN112078514A (en) * | 2020-08-05 | 2020-12-15 | 东风电驱动系统有限公司 | TFT screen alarm lamp self-checking method and device |
| CN112078364A (en) * | 2020-08-05 | 2020-12-15 | 东风电驱动系统有限公司 | UART-based TFT screen alarm lamp self-checking method and system |
| CN112078515B (en) * | 2020-08-05 | 2022-03-04 | 东风电驱动系统有限公司 | TFT screen alarm lamp detection method and system |
| CN112078364B (en) * | 2020-08-05 | 2022-07-01 | 东风电驱动系统有限公司 | UART-based TFT screen alarm lamp self-checking method and system |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120516 |