**1. Introduction**

There is a big responsibility regarding the combustion motors residual compromises, as well as caring their effects on pollution. Consequently, there were prepared some agreements to get action over that problematic, for instance: "What could happen with the older busses and automobiles (which use ICM) in countries where it will not be easy to take them off them from the public/private transport?".

The described question above has not a simple answer, due to the fact that the public transport in many countries (such as in Latin-American) depends on very older ICM, even though there are expectations on new motors as part of the buses on public transport, which are based on electrical motors or hydrogen ICM. Nevertheless, changing their old transport will not be practical for many drivers, and it is expected that different adapted and hybrid systems will be prepared in order to provide adapted ICM with the capability to use hydrogen or different mixing of fuel. Otherwise, this will be trouble due to it must be warranted to get optimal systems to measure the good quality, purity, and concentration of the used fuel. For this reason, this research is proposed a smart sensor to measure the fuel flow with the possibility of giving information on the presence of oxygen or different hydrocarbon molecules.

Therefore, **Figure 1** represents the designed smart sensor as part of an ICM system, in which "ϕ1" means the input of fuel flow to the combustion motor "CM", from which it is possible to obtain torque "T" and revolution per minute "RPM" to be used for machines. Notwithstanding, inside the "CM" is fixed the designed smart sensor "SS" that receives the static difference of pressure "ΔP" that is achieved through the road of the flow on the transducers of "NS". In fact, the estimated signal obtained after the processing of the smart sensor can be sent to an external user through wireless (EW1).

Therefore, the designed smart sensor has the capability to identify fuel based on hydrogen, even though the sensitivity of their transducers also can identify the presence of either oxygen or some molecules of hydrocarbons, in order to give this information to the user through wireless or wire mechanisms [1–5]. That information is quite important to proportionate a diagnostic of the ICM operation, as well as the presence of molecules that can cause disturbance in the optimal operation, by other side the vibration of the motor can be also considered as some kind of disturbances quite important to be studied in the ICM analysis [6, 7].
