Hey Guys, I've got an idea in my head I'd like to execute if possible. Wishing to do away with the MAF sensor on my OBD1 Bosch Motronic 3.3 in my '95 bmw 540i. I've got an Innovate wideband O2 sensor and gauge installed in the car and wondering if I could build a circuit that would send MAF voltage to the vehicles computer based on wideband gauge analog output. Essentially it would be a variable 0V-5V output that would would adjust in order to maintain a 2.5v input. I'm starting with 2.5v for 14.7AFR as the test to see if it's even possible before altering input voltages for different AFR's.
As input voltage to the circuit from the wideband increases (leaner) the output voltage of the circuit would also need to increase to richen the mixture and stabilize AFR and thus bring the input voltage down. It would do the opposite to lean the mixture, as input voltage decreases (richer) the circuit lowers voltage to take fuel away. The output would be constantly changing as engine RPM, load, driving conditions change. At idle it would be around 1V to maintain a 2.5v input, driving and light throttle cruise would be 1.3v-3v range.Acceleration and higher RPM would be 3v-4.8v...all in the name of maintaining 2.5v.
Like how a voltage regulator takes a higher and fluctuating input voltage and converts to a solid output voltage, this would be the opposite.
Is such a creature even possible? Thanks in advance for any help.
ys,
As input voltage to the circuit from the wideband increases (leaner) the output voltage of the circuit would also need to increase to richen the mixture and stabilize AFR and thus bring the input voltage down. It would do the opposite to lean the mixture, as input voltage decreases (richer) the circuit lowers voltage to take fuel away. The output would be constantly changing as engine RPM, load, driving conditions change. At idle it would be around 1V to maintain a 2.5v input, driving and light throttle cruise would be 1.3v-3v range.Acceleration and higher RPM would be 3v-4.8v...all in the name of maintaining 2.5v.
Like how a voltage regulator takes a higher and fluctuating input voltage and converts to a solid output voltage, this would be the opposite.
Is such a creature even possible? Thanks in advance for any help.
ys,