System Of Additional Treatment Of Exhaust Gases; Conditions For Dpf Operation; Dpf Signalization - Zetor CRYSTAL HD 150 Operator's Manual

SYSTEM OF ADDITIONAL TREATMENT OF EXHAUST GASES

The tractor is equipped with the engine fulfilling emission limits STAGE IV and TIER 4f. The compliance with
the emission limit is achieved, among others, by the combination of two systems of treatment of exhaust
gases:
a - Diesel Particulate Filter (DPF) designed for purification of exhaust gases. In the diesel particulate filter,
solid particles (carbon black) formed during incomplete combustion of diesel fuel are gathered and then
burnt. The oxidation catalyst (DOC) is a part of the DPF unit as well.
b - SCR - the SCR abbreviation stands for system for cleaning of exhaust gases of diesel engines using the
selective catalytic reduction decreasing the amount of NOx in the exhaust gases. At the same time, the
reduction agent injected into the exhaust system reacts in SCR catalyst with NOx emissions contained in
exhaust gases which are reduced to nitrogen (N2) and water (H2O). The control of the injected amount of
urea is performed using the control unit itself in connection with the control unit of the engine.
To ensure proper functioning of the system, several its parts are monitored so to meet the
required emission limits:
- The level and quality of urea injected in the catalyst SCR.
- The amount of NOx in exhaust gases and temperature in the system.
- Detection of an illegal intervention and any handling to put the system out of order.

Conditions for DPF operation

During operation of the tractor, the DPF filter is clogged with solid particles generated by the fuel combustion
as the engine is running.
Passive regeneration of the clogged DPF filter occurs in the event of an increased exhaust temperature
above 250 ° C at higher engine load.
Active particle filter regeneration must be triggered by the tractor operator under predefined conditions.

DPF signalization

DPF filtering activities and malfunctions are signaled by
the instrument panel LEDs
- the orange light (1) flashes and the orange light (4) is on
- the DPF filter is soothed - DPF filter regeneration is
required
- red light (2) blinks and the orange light (4) is on - DPF
filter clogged with ash - contact service center
- green LED illuminated - DPF filter regeneration
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