ANALOGUE FUNCTION

Perfect Power Articles.

 

Analogue signals mean a DC voltage in the automotive environment. Actually, analogue means infinite resolution, as opposed to digital (binary) resolution.

In an analogue signal the information is contained in the voltage LEVEL. Therefore, if one modifies the voltage, then you modify the information the signal contains.

The normal range of an analogue signal is 0-5V. Very few cars have 0-10V signals. In the broader sense, an analogue signal can also be a current, but this is seldom used except in a wide band Lambda probe, and other exotic schemes.

 

So in other words an analogue signal is a voltage.

An analogue signal can be modified with resistors and Zener diodes. But – this is not mapping a signal. Mapping means “to modify the signal at a specific point” of the engine operation. The engine operating points can be classified as idle, light load, cruising, full power, and anything in-between.

Therefore, an analogue mapping function looks like:

  1. Scaling and digitizing the voltage
  2. Removing any electronic offset errors
  3. Adding/subtracting any map point value
  4. Converting it back to an analogue voltage

Of course, if the mapping information is ZERO, then the output should be the same as the input voltage.

There is a small concern about timing: If the analogue voltage changes very rapidly, will the output voltage follow? Modern electronics will do this, and it can be stated that engine signals are slow compared to the electronic speed.



WHICH SIGNALS ARE ANALOGUE?

  • Temperature
  • Airflow
  • Manifold pressure
  • Throttle position TPS
  • ETC feedback
  • Lambda (AFR)
  • Wide band AFR

 

ALL OF OUR PERFECT POWER PRODUCTS CAN DEAL WITH ANALOGUE SIGNALS IN THE 0-5V RANGE:

SMT8 piggy-back unit
SMT8L piggy-back unit
SMT8T piggy-back unit
SMT8-FT Fuel Tuner
XMS4 Stand Alone unit
E-Tune Ethanol Control unit
I-SWITCH unit
TF10 Turbo Fueller
FT20 Fuel Tuner

 

ONLY THE FOLLOWING PIGGY-BACK PRODUCTS CAN MODIFY ANALOGUE SIGNALS:

SMT8 piggy-back unit
SMT6 piggy-back unit

 

VISIT THE FOLLOWING LINKS FOR MORE INFORMATION ON THE ANALOGUE FUNCTION:

Product Manuals
Application Notes
FAQ’s