Dab tsi yog cov txheej txheem pov thawj rau 3-xaim sensors

Cov txheej txheem pov thawj rau 3-hloov sensors yuav tsum tau ua kom haum rau cov hom sensor tshwj xeeb thiab daim ntawv thov scenario, siv qhov kev sim zoo li qub, kev tshuaj xyuas cov lus teb, thiab kev sib piv ntawm cov txheej txheem kom paub meej tias kev ua haujlwm zoo. Cov hauv qab no qhia txog cov txheej txheem pov thawj tseem ceeb:

I. General Basic Verification (muaj feem xyuam rau tag nrho 3-xaim sensors)

Kev Tshawb Fawb Kev Siv Hluav Taws Xob thiab Hluav Taws Xob

Siv ib lub multimeter los ntsuas qhov voltage ntawm cov khoom siv hluav taws xob (xws li, cov xaim xim av) thiab hauv av (xiav hlau);

Tus nqi ib txwm yuav tsum yog DC 24V ± 10% (ie, 21.6V txog 26.4V).

Kev txuas ntxiv thiab luv luv -Circuit Testing

Nrog lub hwj chim tawm, xyuas kom meej tias tsis muaj qhov luv luv ntawm ib qho ntawm peb cov xov hlau;

Xyuas kom lub shielding txheej yog grounded ntawm ib kawg nkaus kom tsis txhob muaj kev cuam tshuam hauv av.

II. Kev txheeb xyuas cov txheej txheem cais los ntawm Sensor Hom

1. Kuj-Type Sensors (xws li PT100)

Offline Resistance Verification:

Ntsuas qhov tsis kam ntawm ob lub xov hlau ntawm tib xim thiab cov hlau ntawm cov xim sib txawv; tus nqi no yuav tsum sib haum rau tus nqi nominal tsis kam ntawm qhov ntsuas kub tam sim no (piv txwv li, kwv yees li 109.7Ω ntawm 25 degree);

Qhov kev tawm tsam ntawm ob txoj hlua hluav taws xob yuav tsum nyob ze rau 0Ω (raws li lawv luv luv -circuited ntawm qhov kawg sensor).

Online Signal Verification:

Tom qab siv lub tshuab hluav taws xob, saib lub ntsuas ntsuas los xyuas seb qhov ntsuas qhov ntsuas kub puas ruaj khov thiab plausible;

Yog hais tias cov zaub qhia "infinity" los yog fluctuates hnyav, qhov no yuav qhia tau hais tias ib tug qhib Circuit Court los yog ib tug xov tooj yuam kev.

Fault Indicators: Infinite kuj → Qhib Circuit Court; Tsis kam ntawm 0Ω → Short circuit; Tus nqi drift → Kev sib cuag tsis zoo.

2. Discrete (Switching) Sensors (piv txwv li, Sib Nqus Hloov, Hall Sensors)

Output Level Test:

PNP Hom: Thaum tshwm sim, qhov hluav taws xob ntawm cov kab teeb liab (dub hlau) txheeb ze rau GND yuav tsum nce mus rau ≈24V;

NPN Hom: Thaum tshwm sim, qhov hluav taws xob ntawm cov teeb liab kab ntsig txog GND yuav tsum poob rau ≈0V.

Dynamic Response Testing:

Manually ua rau lub sensor (xws li, los ntawm kev nqa ib qho khoom siv hlau los ze rau nws) thiab saib seb qhov sib thooj PLC input point teb li cas tiag - sij hawm;

Siv lub oscilloscope los xyuas seb cov zis waveform yog ib lub voj voog huv si, tsis muaj glitches lossis distortion.

Cov teeb meem tshwm sim: Cov teeb liab qeeb, tsis ua hauj lwm, los yog qhov tshwm sim tsis tseeb yog feem ntau tshwm sim los ntawm cov khoom siv hluav taws xob tsis ruaj khov lossis cuam tshuam hluav taws xob.

3. Analog Output Sensors (piv txwv li, 4-20mA, 0-10V)

Tam sim no / Voltage tso zis pov thawj:

4-20mA Hom: Txuas lub multimeter hauv series (siv qhov tam sim no ntau yam) los ntsuas seb qhov tso zis sib txawv li cas rau qhov ntsuas ntsuas;

Piv txwv li: Cov zis yog 4mA ntawm 0% kua theem thiab 20mA ntawm tag nrho cov nplai.

0-10V Hom: Ncaj nraim ntsuas qhov hluav taws xob ntawm cov teeb liab kab thiab GND; qhov kev nyeem ntawv yuav tsum sib txawv zoo nyob rau hauv cov lus teb rau cov kev hloov nyob rau hauv input parameter.

Load Capacity Check:

Xyuas kom tag nrho cov voj voog load Tsawg dua los yog sib npaug rau 500Ω (rau 4-20mA systems) los tiv thaiv teeb liab distortion los ntawm voltage poob.

4. Automotive-Specific 3-Wire Sensors (xws li, Crankshaft Position Sensors)

Kev Ntsuas Kev Tiv Thaiv:

Sib nqus- Hom Hluav Taws Xob: Tus nqi tiv thaiv ntawm ob kab teeb liab yuav tsum nyob hauv thaj tsam ntawm 400-600Ω;

Hall- Yam Ntxim Saib Ntxim Ua: Qhov hluav taws xob nruab nrab ntawm cov khoom siv hluav taws xob thiab cov khoom siv hauv av yuav tsum yog 5V lossis 12V, thiab cov kab teeb liab yuav tsum tso tawm ib lub voj voog square.

Teeb liab Waveform Detection:

Siv lub oscilloscope los saib seb puas muaj lub teeb liab AC lossis square yoj ib txwm muaj thaum lub cav cranking;

Raws li lub cav ceev nce, lub teeb liab zaus yuav tsum nce, thaum lub amplitude tseem nyob ruaj khov.

Data Stream Reading (ntawm Diagnostic Scanner):

Xyuas seb qhov tsis xws li lub cav RPM thiab cov roj txhaj tshuaj tau hloov kho li qub.

III. Advanced Verification Methods (Txhim kho qhov tseeb qhov tseeb)

Pom zoo Troubleshooting Workflow:

Fais fab tuag: Kos qhov tsis kam → Fais fab tuag: Ntsuas Voltage → Trigger: Test Signal Output → System: Verify Feedback