KRYOTEC ENGINE 118 Diesel engines produce a variety of particles during combustion of the fuel/air mix due to incomplete combustion. Diesel particulate matter resulting from the incomplete combustion of diesel fuel produces soot (black carbon) particles. Soot and other particles from diesel engines worsen the particulate matter pollution in the air and are harmful to health. Diesel particulate filters (DPF) are devices that physically capture diesel particulates to prevent their release to the atmosphere. The exhaust gases pass through the filter, which collects particles from the gases. Collected particulates are removed from the filter through thermal regeneration. SELECTIVE CATALYST REDUCTION (SCR) Selective Catalytic Reduction (SCR) is an advanced active emissions control technology system that injects a liquid reductant agent through a special catalyst into the exhaust stream of a diesel engine. The reductant source is Diesel Exhaust Fluid (DEF). This reductant is also known as Diesel Exhaust Fluid (kDEF). Diesel Exhaust Fluid (DEF) sets a chain of chemical reaction that converts nitrogen oxides into nitrogen, water and tiny amounts of carbon dioxide. Mixer is used to thoroughly mix ammonia in the with the exhaust gas. DIESEL EXHAUST FLUID (DEF) INJECTOR Dosing of precise amount of DEF (Diesel Exhaust Fluid (DEF)) is necessary for the required chemical reactions to begin in the SCR system. Diesel Exhaust Fluid (DEF) injector injects the precise amount of Diesel Exhaust Fluid (DEF) into the SCR on exhaust stream. Diesel Exhaust Fluid (DEF) contains two amino groups and when disintegrating in heat, they turn into ammonia, carbon dioxide and water. Within the SCR catalyst the NOx is catalytically reduced by the ammonia into water and nitrogen, which are both harmless. DPF related warning lamps The vehicle is equipped with a Diesel Particulate Filter (commonly known as DPF). DPF is a mechanical filter that physically traps particulate matter from diesel engine exhaust gas. DPF traps the particulate matter in the following way: Filtration – Particulates / soot are collected in the inlet channel of the filter. Regeneration – When the filter channels are filled up with soot, they are cleaned automatically by the engine management system. This process is known as DPF Regeneration and this will happen during normal running of the vehicle. DPF equipped in Harrier vehicle normally regenerates automatically which is controlled by engine management system. In certain specific driving conditions, DPF regeneration may not happen automatically as the desired temperatures required to regenerate soot many not be achievable due to specific driving conditions. This includes prolonged driving at low vehicle speeds for considerable amount of time (driving in heavy city traffic), prolonged running of the engine in idle conditions etc. In such cases, a warning lamp as indicated below will be illuminated in the instrument cluster indicating that soot regeneration is insufficient. This warning lamp switches ON constantly to indicate that the DPF needs to be regenerated. This lamp does not indicate any malfunction. The warning lamp remains OFF during normal vehicle behaviour and lights up only when driving condition requires the driver to be notified. When this lamp is ON, keep the car running ideally at 3rd gear 60kmph with engine speed over 2000 rpm until regeneration is completed and warning lamp goes OFF. The process normally takes about 20 minutes. Note: Do not shut down engine till the warning lamp goes OFF. The warning lamp remains OFF during normal vehicle behavior and lights up only when driving condition requires the driver to be notified. When this lamp is ON, keep the car running ideally at 3rd gear 60kmph with engine speed over 2000 rpm until regeneration is completed and warning lamp goes OFF. The process normally takes about 20
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