bah писал(а):Подскажите как откорректировать напряжение бортовой сети, БК показывает 14В тестер 14,4В?
Можно откалибровать напряжение, которое считывает сам елм адаптер:
https://hobdrive.userecho.com/knowledge ... ryazheniyaReading the Battery VoltageBefore proceding to the OBD Commands, we willshow an example of how to use an AT Command. Wewill assume that you have built (or purchased) a circuitwhich is similar to that of Figure 9 in the ExampleApplications section (page 56). This circuit provides aconnection to read the vehicle’s battery voltage, whichmany will find very useful.If you look in the AT Command list, you will seethere is one command that is listed as RV [Read theinput Voltage]. This is the command which you willneed to use. First, be sure that the prompt character isshown (that is the ‘>’ character), then simply enter ‘AT’followed by RV, and press return (or enter):>AT RVNote that we used upper case characters for thisrequest, but it was not required, as the ELM327 willaccept upper case (AT RV) as well as lower case(at rv) or any combination of these (At rV). It does notmatter if you insert space characters (‘ ’) between the‘AT’ and the ‘RV’ either, as they will be ignored by theELM327.A typical reposnse to this command will show avoltage reading, followed by another prompt character:12.6V>The accuracy of this reading depends on severalfactors. As shipped from the factory, the ELM327voltage reading circuitry will typically be accurate toabout 2%. For many, this is all that is needed. Somepeople may want to calibrate the circuitry for moreaccurate readings, however, so we have provided aspecial ‘Calibrate Voltage’ command for this.To change the internal calibration constants, youwill need to know the actual battery voltage to moreaccuracy than the ELM327 shows. Many quality digitalmultimeters can do this, but you should verify theaccuracy before making a change.For this example, let us assume that you haveconnected your multimeter, and you find that it reads12.47V. The ELM327 is a little high at 12.6V, and youwould like the ELM327 to read the same as yourmeter. Simply calibrate the ELM327 to that voltageusing the CV command:>AT CV 1247OKNote that you should not provide a decimal point inthe CV value, as the ELM327 knows that it should bebetween the second and the third digits.At this point, the internal calibration values havebeen changed (ie. written to EEPROM), and theELM327 now knows that the voltage at the input isactually 12.47V. To verify that the changes have takenplace, simply read the voltage again:>AT RV12.5V>The ELM327 always rounds off the measurementto one decimal place, so the 12.47V actually appearsas 12.5V (but the second decimal place is maintainedinternally for accuracy and is used in the calculations).There is currently no way to restore the ELM327 to thefactory setting once you have sent a CV command, sobe careful while experimenting with it.The ELM327 can be calibrated with any referencevoltage that you have available, but note that the CVcommand always expects to receive four charactersrepresenting the voltage at the input. If you had used a9V battery for your reference, and it is actually 9.32V,then you must add a leading zero to the actual voltagewhen calibrating the IC:>AT CV 0932OK>The other AT Commands are used in the samemanner. Simply type the letters A and T, then followthat with the command you want to send, then anyarguments that are required for that command, andpress return (or enter, depending on your keyboard).You can always insert space characters as often asyou wish if it improves the readability for you, as theyare ignored by the ELM327.
https://www.elmelectronics.com/wp-conte ... 327DSF.pdfМожете откалибровать с помощью elm327chat введя команды:
ATZ - сброс адаптера
ATRV - считать напряжение
ATCV 1400 - вводим правильное напряжение в даном примере 14,00В
ATRV - считываем еще раз напряжение с модуля елм