We did not stop at real-time ECU programming and decided to start expanding our narrow specialization in the field of devices for tuning ICE control systems, and the next product was ExTuner - a system for measuring and monitoring the parameters of the air-fuel ratio (A / F Ratio) and temperature exhaust gases (EGT), as well as additional functions, such as connecting most of the sensors to monitor additional parameters (for example, boost pressure, coolant temperature, oil, etc.); emulation of a signal of a narrow-band oxygen sensor (0-1V); support Innovate serial protocol (LC-1 / LM-1,2) for the ability to output AFR readings to any software that supports this protocol and others.
Background. What attention was paid to when creating
It took more than a year to develop this device, when the release dates were outlined in half a year after writing the first line of code. Why? The fact is that most of the time was spent on creating a competent controller for a wideband oxygen sensor (hereinafter AFR), namely, great attention was paid to the accuracy of readings and reliability. The fact is that initially the accuracy of the AFR controller system was based on the use of the internal calibration resistance of the sensor, the resistance of which is selected during production, depending on the individual characteristics of the sensor, and during operation, the controller automatically takes into account this resistance to correct the readings. This approach is the simplest, but with its own nuances, which we will discuss below.