Daily_Driver wrote:At a minimum, I want to read the following factory sensors:
MAP (for boost, 0-5V, have factory data table)
Coolant temperature (0-5V, have factory data table)
Oil pressure (resistance in ohms to be determined)
As I read the manual, I do not need to read fuel level in order to display fuel economy and distance to empty. My car has an 8K pulse per mile speed sensor and I can connect to fuel injector #1 for the (-) PWM signal needed.
Daily_Driver wrote:I'm also using an added oil temperature sensor, it is a General Motors part and it has a data table (click for PDF).
For the coolant sensor, the car uses two- one for the gauge (resistance) and another for the ECU (voltage). I found the following data for the ECU sensor has data for temperature:volts from 110 degrees (F) up to 220 degrees.
Daily_Driver wrote:The factory MAP sensor has the data for pressure:volts from 14.31 PSI down to 24.01 hg.
Daily_Driver wrote:(...) I will likely add a 0-5V fuel pressure sensor as well.(...)_
For the oil pressure sender, I can use an air compressor and an ohm meter to get data points, but it should be about
10 PSI: 45-55 Ohms or Open,
90 PSI: 35-40 Ohms.
Daily_Driver wrote:I'll use Adc 1 for MAP, Adc 2 for coolant, Adc 3 for oil pressure, Adc 4 for oil temperature, and AdcVcc1 for fuel pressure. I can use the 18B20 for ambient outside air temperature and another inside if needed.
Yes, but fuel pressure measurement will affect on fuel consumption measurements (if you choose fuel pressure on Adc input than UTCOMP will include this measurement in fuel consumption). Petrol engines has fuel pressure regulator and fuel pressure on injectors (in comparison to pressure in manifold) is constant. If you will measure fuel pressure in comparison to atmospheric pressure than you will have error in fuel consumption measurements.
ArT wrote:Yes, but fuel pressure measurement will affect on fuel consumption measurements (if you choose fuel pressure on Adc input than UTCOMP will include this measurement in fuel consumption).
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