The new digital sensor generation is mainly used in the automotive sector for sensors for boost pressure, intake manifold pressure and fuel pressure.
The advantage of these sensors is the fast, digital data transmission. The transmission itself is relatively uncritical when it comes to interference signals.
Within this transmission protocol, several different measured values can be transmitted on one line.
A boost pressure sensor, for example, is not only used to record the boost pressure and the charge air temperature, but also to control the injection quantity, for example. Changing the injection quantity alone, without recording and processing the SENT signals, no longer leads to optimization of the engine.
Capturing, processing and outputting modified SENT protocols in a processor is a very complex topic and requires special processor technology.
SENT sensors not only record values and pass them on digitally to the engine control unit, but also provide other data already stored in the sensor, such as sensor type, part number, counter, scaling, etc.
As a rule, a boost pressure, for example, is stored and transmitted in a 12-bit variable.
12 bits correspond to 4096 possibilities. So if a "possibility" equals 1 mbar, then scaling is quite easy.
Schematischer Aufbau eines SENT Protokolls:
Details - SENT Protokoll.pdf
The advantage of these sensors is the fast, digital data transmission. The transmission itself is relatively uncritical when it comes to interference signals.
Within this transmission protocol, several different measured values can be transmitted on one line.
A boost pressure sensor, for example, is not only used to record the boost pressure and the charge air temperature, but also to control the injection quantity, for example. Changing the injection quantity alone, without recording and processing the SENT signals, no longer leads to optimization of the engine.
Capturing, processing and outputting modified SENT protocols in a processor is a very complex topic and requires special processor technology.
SENT sensors not only record values and pass them on digitally to the engine control unit, but also provide other data already stored in the sensor, such as sensor type, part number, counter, scaling, etc.
As a rule, a boost pressure, for example, is stored and transmitted in a 12-bit variable.
12 bits correspond to 4096 possibilities. So if a "possibility" equals 1 mbar, then scaling is quite easy.
Schematischer Aufbau eines SENT Protokolls:
Details - SENT Protokoll.pdf