Heavy truck Tenneco urea pump A7T5 new Steyr Haowohao Han

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Tenneco postprocessing system introduced the country to meet four emissions regulations, there are two main techniques:? Which is a kind of exhaust gas recirculation (EGR) based processing part by catalytic oxidation of particles in (EGR+POC) or (EGR+DPF), and particle capture by catalysis for further reduction of nitrogen oxide ;? One is by adjusting the fuel injection and combustion, try to control the particles in the machine production, and in the postprocessing process, the selective reduction of nitrogen oxides by SCR urea aqueous solution. FEUP-SCR system is based on the three FEUP system (ECU for 3601115-98), increased Tenneco (including DCU) SCR system, this system installed only in DEUTZ engine, engine models such as BF6M2012-18E4-1429, the EGR scheme in four models such as the BF4M101318E4R1075 DEUTZ engine. SCR system requires the use of urea content of 32.5% urea solution (hereinafter referred to as the urea water solution) as the system reaction of the reducing agent.
FEUP-SCR Tenneco system structure diagram: schematic structure:
normal without the
1.5 generation system to cancel the working process of
SCR system: standby: power system is in standby state. When the engine is started, the system will be heated for a short period of time if the ambient temperature and urea tank temperature are below 5. After thawing, the system is in the condition of building pressure. Pressure: due to Tenneco nozzle is urea cycle cooling system, so in addition in the thawing process, the system will immediately start the engine after the establishment of 2bar (200KPa) pressure. When the postprocessing temperature reached 200 degrees above (before and after the exhaust temperature sensor average), established 5.5 bar urea pump (550kpa) pressure urea injection, when the postprocessing temperature lower than 200 DEG C, the system will return to 2bar again (200KPa). Cooling condition: when the engine is off, after the treatment to enter the cooling state, then the urea hydraulic system will maintain the 2bar pressure for a period of time, the purpose is to reduce the residual gas temperature on the impact of the nozzle. Empty state: after cooling down for some time, the urea pump will be inverted to return the urea in the urea pipeline to the urea tank. After the completion of the system will automatically shut down the system.
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