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 exceptional durability, even with undesirable knocking events. Commonly used fiber optical sensors require a heatshield that in time clogs with soot and causes a sensor fail. Because of the unique design the ArenaRed CPS does not require a heat shield for protecting the sensor.
A drawback of this kind of fiber optical CPS is that thermal expansion causes displacement of the membrane that will be seen as an erroneous pressure change, which is known as thermal shock error. The ArenaRed CPS electronics use membrane position measurements at two locations to eliminate the thermal shock error (patented). Using this feature the sensor gives information about the cylinder temperature, which can be used to optimize engine efficiency by reducing heat loss.
The combustion temperature is derived from the combustion pressure and the cylinder volume (patented). The emissions are optimized by keeping the combustion temperature below the thermal NOx formation temperature for the relevant timescales and above the CO and CH 4 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 can be in the range of 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 fibers are placed in a separate unit which is held in place in the injector using the internal tension forces of the injector. The D2,5mm sensor head is not placed in line with the membrane, which makes it easier to circumvent the diesel injector. ArenaRed is able to produce diesel nozzles with eccentric placed needle(s), which makes it possible to integrate the sensor within small diesel injectors used in the smallest personal cars.
A feasibility study in 2017 has shown that the development of the CPS will be succesfully finished in 2018.
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