at page 9 of this Huss emission technology magazine is something written about Zetor :
issuu.com
They have contracts to supply the DPF for TIER 4 final as well. That would probably mean in 2014 they add a new exhaust pipe with integrated AdBlue kat behind the DPF.
In the 100-175hp class they must reduce from 3.3 to 0.4g/kwh Nox so they can probably do this with just adding SCR and not wasting the engine responsiveness with more EGR... John Deere in the +175hp class (NoX emission in TIER 3B of 2gr/kwh, so quite lower than the 100-175hp class in which Zetor is operating) needs two turbos (a fixed plus a VGT which keeps getting stuck from EGR soot) in order to keep a little responsiveness, and their EGR rates need a throttle valve to squeeze the fresh air so the exhaust gas is able to enter the intake manifold... All in all a lot of pressure loss and additional cooling capacity required, while the fuel consumption is higher than any other competitor.
It is my assumption that Zetor adds SCR to the current engine, and all other parameters remain the same. With a mechanical fuel pump you dont have many options of providing multiple injections in order to reduce NoX and soot, and a mechanical fuel pump doesnt allow to gradually ramp up the fuel injection to let the turbo spool up, so they just need the DPF. An EGR only solution is not possible, that strategy allmost bankrupted Navistar trucks (USA) because of warranty claims, and after a change of management they are now developing SCR whilst paying a fine for every non-compliant truck they build right now untill they have compliant engines again... Navistar Expected to Alter Course - http://online.wsj.com/article/SB10001424052702304708604577503292076655510.html
So i think there wont be a lot of news for 09/2014 because SCR is inevitable even for John Deere with its shitload of junk they added to the engine, (they had to give in to SCR in the end, but not before highly increasing the complexity and cost of their engines in order to postpone SCR un the +175hp class for 3 more years, and no further gain at all) and Zetor already signed a contract for DPF supplies in the TIER 4 final...
So by the looks of things its going to be the current EGR-DPF with mechanical fuel injection engine, with SCR added for TIER 4f, or will they use the Motorpal common rail system to reduce soot, so they can go with a maintenance free SCR-DOC system like New Holland ? I dont think they have the time for such a change of strategy at this time (last minute change of strategy is the same reason why JD's TIER 4F engines are so complex while basically using the same technologies as others)


HUSS Magazine 9_EN
HUSS Group magazine, 2nd quarter 2011. Exhaust after treatment solutions worldwide. Zetor IIIB and IV project, Frankfurt fire brigade retrofits, TRU market review and the DOE school buses retrofit project in New York.
They have contracts to supply the DPF for TIER 4 final as well. That would probably mean in 2014 they add a new exhaust pipe with integrated AdBlue kat behind the DPF.
In the 100-175hp class they must reduce from 3.3 to 0.4g/kwh Nox so they can probably do this with just adding SCR and not wasting the engine responsiveness with more EGR... John Deere in the +175hp class (NoX emission in TIER 3B of 2gr/kwh, so quite lower than the 100-175hp class in which Zetor is operating) needs two turbos (a fixed plus a VGT which keeps getting stuck from EGR soot) in order to keep a little responsiveness, and their EGR rates need a throttle valve to squeeze the fresh air so the exhaust gas is able to enter the intake manifold... All in all a lot of pressure loss and additional cooling capacity required, while the fuel consumption is higher than any other competitor.
It is my assumption that Zetor adds SCR to the current engine, and all other parameters remain the same. With a mechanical fuel pump you dont have many options of providing multiple injections in order to reduce NoX and soot, and a mechanical fuel pump doesnt allow to gradually ramp up the fuel injection to let the turbo spool up, so they just need the DPF. An EGR only solution is not possible, that strategy allmost bankrupted Navistar trucks (USA) because of warranty claims, and after a change of management they are now developing SCR whilst paying a fine for every non-compliant truck they build right now untill they have compliant engines again... Navistar Expected to Alter Course - http://online.wsj.com/article/SB10001424052702304708604577503292076655510.html
So i think there wont be a lot of news for 09/2014 because SCR is inevitable even for John Deere with its shitload of junk they added to the engine, (they had to give in to SCR in the end, but not before highly increasing the complexity and cost of their engines in order to postpone SCR un the +175hp class for 3 more years, and no further gain at all) and Zetor already signed a contract for DPF supplies in the TIER 4 final...
So by the looks of things its going to be the current EGR-DPF with mechanical fuel injection engine, with SCR added for TIER 4f, or will they use the Motorpal common rail system to reduce soot, so they can go with a maintenance free SCR-DOC system like New Holland ? I dont think they have the time for such a change of strategy at this time (last minute change of strategy is the same reason why JD's TIER 4F engines are so complex while basically using the same technologies as others)
