Thursday, March 13, 2014

Update #1 on Airflow potentiometer replacement project

Following my post about replacing the airflow potentiometer with a modern alternative, here are some updates

Parts are in.

Simulated input vs output testing.

Using a truck throttle position sensor to vary the input signal and created the output signal.

Using PWM to drive a RC circuit to achieve an analog signal to be seen by the ECU correctly.

The results are quite pleasing. Achieving less than 10ms of delay between the actual response of the output signal mirroring the input PWM.

Click to enlarge to see the 2 lines more clearly

Here is the actual hardware setup

Won't be long before this unit will be installed on a W124 for data collection and calibration.