Power Transmission
moulds protect electrical connections against moisture and corrosion.
Additionally the SCR system (AD Blue supply tank) is also
heated via the coolant circuit for which Gates is offering ECR (Electrochemical Chemical Resistant) EPDM hoses and which are colour-coded for easy selection and installation.
Optimal performance
The selective catalytic reduction system does not work until the fluid is thawed. Therefore if it takes x minutes to thaw the system, the vehicle will be operating for x minutes before the emissions are treated. Table 2 compares the performance of various SCR heated hose assembly designs out in the market. The time to thaw metric shows the comparison on how each design performs in the areas of power optimisation and fluid heating rate. The SCR heated hose
Fig. 2. Coiled wire designs.
assembly heat uniformity is compared below for each design. The coiled wire designs result in an uneven heating
pattern; therefore, resulting in a longer time to thaw. Gates carbon fibre braided sleeve design resulted in uniform heating throughout the hose assembly including the fittings. This resulted in the SCR heated hose assembly to thaw the ADBlue fluid quicker. Also the protection
of the connectors has been viewed as another important point for optimal performance of your SCR system. Field tests have
Fig. 3. Carbon Fibre braided sleeve design.
proven that moisture ingression can cause SCR assembly failure, due to electrical connections corroding and eventually stop working.
Over-mould design
With Gates thermoplastic over-mould design this concern is outruled. When subjected to salt spray testing per ASTM B390 for more than 18 months now, the assemblies have not had any change in electrical resistance which would affect the heating performance. ●
Enter 45A or ✔ at
www.engineerlive.com/ede
Marc Ostermann is Engineering Director, Fluid System - Global Automotive & Transportation Systems, Gates Corporation, Englewood, CO, USA.
www.gates.com/europe
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info@frizlen.com
Circle 45 or ✔ at
www.engineerlive.com/ede MOVEMENT!
Keep your braking energies under control with FRIZLEN power resistors. Our resistors ensure the dynamics you need when dealing with power electronics equipment, e.g. for cranes and hoisting units. We offer resistors for powers from 5 W to 250 kW, protection degrees up to IP 67, UL recognized.
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