- Home
- Companies
- PURitech Gmbh
- Products
- PURItech - Model DAS-DBS - Diesel ...
PURItech - Model DAS-DBS -Diesel Particle Filter
The DAS-DBS system is a combined regeneration filter system, comprising an active regeneration component (external fuel injection) and a passive component (catalytic filter coating or fuel borne catalyst). The filter system is designed for vehicles and machines operating often on a severe duty cycle (low exhaust gas temp.). It is intended for applications, where purely passive regeneration would not work. The filter regeneration with the DAS-DBS system is electronically controlled (backpressure) and occurs automatically during normal vehicle operation.
- Buzzer + LED display (functional monitoring)
- Central processing unit: ECU, injection pump, system monitoring, datalogger, CAN-port
- Backpressure measuring line
- Temperature sensor 1+2
- Injection nozzle
- Diesel particle filter
- Pre-filter
- Fuel line
- Additive tank (only Type A)
- External fuel injection to increase the exhaust gas temperature (+320°C)
- Increase of exhaust gas temperature in order to implement the filter regeneration
- Type A System: Regeneration by fuel-additive (on-board dosing system)
- Type B System: Regeneration by catalytic coating of filter monolith
- Operation at medium exhaust gas temp. (Type B: >250°C/ Type A >280°C): Passive self-regeneration, no filter loading with soot particles
- At lower exhaust gas temp. (<250°C/
- Increase of exhaust gas backpressure, activation of backpressure signal Automatic fuel injection through backpressure signal
- Injection of diesel fuel into the exhaust pipe upstream of filter system through injection nozzle and injection pump (component of central unit)
- Catalytic oxidation of the injected fuel in the pre-filter, leads to an increase of exhaust gas temperature upstream of the particulate filter
- Increase of exhaust gas temp. from 190 to 500°C for fast regeneration
- Automatic monitoring / control of
- start of fuel injection (T1 >180°C / Δp)
- duration of fuel injection (Δp/backpressure)
- fuel quantity (T1 >180°C / T2 <500°C)
- stop fuel injection (T1 <180°C)
controlled via temperatur and pressure signal (sensors on pre-filter) by means of the electronic control unit with integrated PID-regulation.
- Permanent Regeneration from 180°C exhaust gastemperature
- Lowback pressure
- Perfect system for TIER-3 / EURO-5 diesel engines
- 24-hours continous operation
- Automatic controlled regeneration during operation
If the vehicle is operated at sufficient load (250-350°C), the filter system regenerates solely passively (catalytic filter coating/ Type B or dieseladditive/ Type A). The injection of fuel is not necessary at that point. The filter will be charged with soot particles at lower load operation and the backpressure increases. At a specific backpressure level (e.g. 80mbars/ free-adjustable), the ECU automatically activates the fuel injection and starts the filter regeneration. The pre-filter oxidizes the injected fuel catalytically and this reaction heat raises the exhaust gas temperature.
- Applicable for: Severe duty cycle (low load) / Stop-and-go operation
- Regeneration Type: Combined Regeneration: Active + Passive
- Regeneration Temp.: from 180°C exhaust temp. > 15% of operation time
- Regeneration Time: Permanent self-cleaning during operation
- Emission Reduction: Particle mass -95% / Carbonmonoxide (CO) -95%
- Nanoparticles -99% / Hydrocarbons (HC) -99%
- Filter Medium: Silicone Carbide (SiC) Monolith
- Certified by: TRGS/TÜV/KBA/AUVA/VERT + CARB (in test)
- Maintenance: Injection nozzle: 500 hrs / filter cleaning: 1.000 hrs
- Installation: Filter installation in place of silencer