CN101149278A - Automobile instrument integral detection method - Google Patents
Automobile instrument integral detection method Download PDFInfo
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- CN101149278A CN101149278A CNA200710112965XA CN200710112965A CN101149278A CN 101149278 A CN101149278 A CN 101149278A CN A200710112965X A CNA200710112965X A CN A200710112965XA CN 200710112965 A CN200710112965 A CN 200710112965A CN 101149278 A CN101149278 A CN 101149278A
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Abstract
The invention discloses a kind of combination detection method for the vehicle meter. It is characterized in that the signal from program controlling signal generator is transformed to the detected meter after adjusting by the power amplifying amplitude; the resistance signal from resistance flashboard and controlling board are also transformed to the detected meter. The signal from meter is detected by the output voltage detection system to determine if it is quality. By above method, the detection efficient of vehicle meter has been improved greatly, so it can avoid the error and loss detection from human in detection process to pledge the meter quality.
Description
Technical field
The present invention relates to a kind of automobile instrument integral detection method that automobile instrument is carried out comprehensive detection.
Background technology
At present, because the automobile instrument model is various, parameter is different, and the detection problem of dispatching from the factory of instrument becomes the bottleneck of restriction enterprise large-scale production.Because instrumental technique content is higher, to safeguard, testing staff's competency profiling is than higher, and the factory inspection when producing in batches mainly is connected to each other by instruments such as artificial employing power supply instrument, signal generation tester, resistance box, multimeters instrument is detected; This detection mode not only exist labour intensity greatly, easily make mistakes, efficient is low, maintenance cost is high, be not easy to shortcomings such as management, and can not adapt to the demand of large-scale mass production.Institute thinks to make find out failure cause fast when instrument breaks down, and for the requirement that adapts to large-scale mass production provides detection means fast and accurately, then is that prior art has problem to be solved simultaneously.
Summary of the invention
Technical matters to be solved by this invention provides a kind of instrument detecting method that can the various unlike signals of simulated automotive, improves efficient and the accuracy that instrument detects to reach, and then improves instrument production efficiency.
For solving the problems of the technologies described above, technical scheme of the present invention is:
One,, guarantees instrument verification for automobile instrument provides the constant DC source.
Two, simulated automotive is supplied with the signal of instrument the electronic type speedometer of instrument, tachometer gage, fuel level gauge, water-thermometer, tensimeter etc. is tested.Mainly by the square-wave signal that takes place of the odometer sensor of automobile and speed probe 1,, this square-wave signal is produced by the program control signal generator simulating signal; 2, the resistance signal of level detector, cooling-water temperature sensor and pressure transducer (comprising: engine oil pressure pickup, baroceptor etc.) generation, this resistance signal is produced by the resistance signal system.
Three, the signal to instrument supply automobile detects, and reaches the requirement of regulation to guarantee it, mainly is the power supply signal that measuring instrument is supplied with the speedometer for automobile sensor, and this detection is finished by instrument output voltage monitoring system.
By taking above-mentioned instrument detecting method, the factory inspection efficient of automobile instrument is greatly improved, eliminated the sum of errors omission phenomenon that human factor causes in the checkout procedure.The instrument outgoing is guaranteed.
Description of drawings
Now in conjunction with the accompanying drawings the utility model is further described:
Fig. 1 is an one-piece construction block diagram of the present invention
Fig. 2 is a program control signal generator program flow diagram of the present invention
Fig. 3 is a resistance signal system program process flow diagram of the present invention
Fig. 4 is an instrument output voltage detection system process flow diagram of the present invention
Embodiment
As shown in Figure 1, the signal that the program control signal generator sends is sent to the instrument that needs detection after the power amplification amplitude is regulated, the signal that the resistance signal system that resistance plate and resistance control panel are formed sends also is sent to the instrument that needs detection, and the signal that instrument is sent detects through the output voltage detection system again judges whether instrument is qualified.Now specify the detection principle of analogue signal generating principle of the present invention and instrument output voltage in conjunction with the accompanying drawings.
One, program control signal generator principle and flow process:
Programmable signal generator is that simulated automotive odometer sensor and signals of rotational speed sensor are tested to instrument, through exporting instrument to behind power amplification circuit and the amplitude regulating circuit, the electronic type speedometer and the tachometer gage of automobile instrument is tested.
The programmable signal generator system mainly contains single-chip microcomputer PIC16F873A, parallel interface 8255A-5, reference frequency generator, 4527 coefficient multipliers, 1621LCD display module, ten frequency divider 74LS90, power supply, amplitude adjusting, power amplification, keyboard etc. and partly constitutes.This signal generator can be in the 1-10kHz scope presets arbitrarily and shows the frequency of generator, and in conjunction with the actual instrument detection method, predetermined frequency had increase progressively and decrement function, when detecting the instrument of different model, only need to set an original frequency value and get final product.
Principle of work is: single-chip microcomputer 16F873A is by analyzing keypad information and computing (is seen Fig. 2: program flow diagram), then 8255-5 is controlled, 8255 output binary-coded decimals are controlled BCD coefficient multiplier 4527, produce square-wave signal, through 74LS90 frequency division integer, obtain the ideal square wave signal again.Predetermined frequency value and output frequency value are sent to LCD display by single-chip microcomputer with serial mode and show.
Two, resistance signal system principle and flow process:
The resistance signal system can export the resistance signal of three road band error compensations, and can detect three simultaneously is the instrument of signal with the resistance, is made up of resistance control panel and resistance plate.The resistance control panel is used for controlling imports corresponding resistance value to instrument, selects 1 analog switch CD4067, field effect transistor IRF640,12 to select 1 waver to form by single-chip microcomputer PIC16F873A, 16.The resistance plate can be selected different resistance, to adapt to the requirement of various instrument different parameters.
Principle of work is: detect the waver and the resnstance transformer position of the switch by single-chip microcomputer, output binary-coded decimal control analog switch CD4067 wherein one tunnel output 12V power supply makes the IRF640 conducting, and the resistance on the plate can output to instrument by IRF640 and (see Fig. 3: program flow diagram).Because the conducting resistance of IRF640 is extremely low, is 0.18 Europe, so can not influence the precision of resistance.
Three, instrument output voltage detection system principle and flow process:
Instrument output voltage detection system is to utilize amplifier 741 to form voltage comparator to report to the police.Workflow is seen Fig. 4.
Principle of work is: when detection voltage was lower than setting voltage, 741 can make the triode conducting by the output high level, drive the hummer sounding then.
Claims (1)
1. automobile instrument integral detection method, it is characterized in that: the single-chip microcomputer 16F873A in the program control signal generator is by analyzing and computing keypad information, then 8255-5 is controlled, 8255 output binary-coded decimals are controlled BCD coefficient multiplier 4527, produce square-wave signal, through 74LS90 frequency division integer, obtain the ideal square wave signal again, predetermined frequency value and output frequency value are sent to LCD display by single-chip microcomputer with serial mode and show; In the resistance signal system, detect the waver and the resnstance transformer position of the switch by single-chip microcomputer, output binary-coded decimal control analog switch CD4067 wherein one tunnel output 12V power supply makes the IRF640 conducting, and the resistance on the plate can output to instrument by IRF640; In the instrument output voltage detection system, when detection voltage was lower than setting voltage, 741 can make the triode conducting by the output high level, drive the hummer sounding then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710112965XA CN101149278A (en) | 2007-09-24 | 2007-09-24 | Automobile instrument integral detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710112965XA CN101149278A (en) | 2007-09-24 | 2007-09-24 | Automobile instrument integral detection method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101149278A true CN101149278A (en) | 2008-03-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200710112965XA Pending CN101149278A (en) | 2007-09-24 | 2007-09-24 | Automobile instrument integral detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101149278A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101762296B (en) * | 2010-01-29 | 2012-02-08 | 北汽福田汽车股份有限公司 | Instrument fault detection device |
-
2007
- 2007-09-24 CN CNA200710112965XA patent/CN101149278A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101762296B (en) * | 2010-01-29 | 2012-02-08 | 北汽福田汽车股份有限公司 | Instrument fault detection device |
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| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080326 |