Smart Combustion Technology

M5 CPS (patented)M5 CPS (patented)

Combustion Pressure Sensor

ArenaRed’s Combustion Pressure Sensor (CPS) is a fiber optical sensor that measures the light intensity reflected by a membrane exposed to the pressure. The uniquely designed fixation of the fibers and heat conductivity of the sensor ensures an exceptionally extended life length, even with undesirable knocking events. Ordinary fiber optical sensors require a heatshield that within a certain time clogs with soot and causes a sensor fail. Because of the unique design of the ArenaRed CPS it does not require a heat shield for protecting the sensor.  

A drawback of this kind of fiber optical CPS is that thermal expansion gives a displacement of the membrane that will be seen as an erroneous pressure change, this effect is also known as thermal shock error. The ArenaRed CPS electronics uses membrane position measurements at 2 locations to eliminate the thermal shock error (patented). Due to this feature the sensor also gives information about the cylinder temperature, this value can be used to optimise engine efficiency by reducing heat loss.

The combustion temperature is derived from the combustion pressure and cylinder volume (Patented). The emissions are optimized by keeping the combustion temperature below the NOx formation temperature and above the CO and CH4 oxidation limit (patented). This is the major control parameter that the ArenaRed ECU uses to reduce its emissions.  
The CPS Electronics give a Canbus diagnostics readout.

The power feed is allowed to be 5 to 32 volt

CPS integrated in diesel injector

This sensor has the same membrane and electronics as the M5 version with the difference that the membrane is welded upside down into the diesel nozzle. The fibres are placed in a separate unit which is held in place in the injector using the tension force of the injector. The D2,5mm sensor head is not placed in line with the membrane. This makes it easier to pass the diesel injector. ArenaRed is able to produce diesel nozzles with eccentric placed needle(s), this creates the possibility to integrate the sensor within a small diesel injector also for the smallest personal car. 


Design specification CPS M5

Design specifications CPS D2.5

Het haalbaarheidsonderzoek in 2017 heeft aangetoond dat we de CPS succesvol kunnen afronden in 2018.

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