EURO 5 EMISSION STANDARD 
The Euro 5 emission standard is one of the strictest automotive emission standards being widely implemented worldwide, including in Vietnam. The purpose of the Euro 5 emission standard is to create environmentally friendly automotive products and enhance the quality of life. 

The Euro 5 standard sets limits on emissions, including carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NOx), and fine particulate matter, helping to minimize negative impacts on the environment and human health. 

To meet this stringent emission standard, Hino has applied DPR technology to the Hino Series 300, aiming to reduce fine particulate matter generated from the incomplete combustion of diesel fuel. 

DPR EMISSION TREATMENT SYSTEM 

The DPR emission treatment system—short for Diesel Particulate Active Reduction System—is an after-treatment system that helps reduce soot (also known as PM) in exhaust emissions. The DPR system is implemented in the Hino Series 300 to significantly reduce the amount of PM in the engine exhaust before it is released into the environment. 

BASIC COMPONENTS OF THE DPR SYSTEM 

1. Fuel Cut Valve: A protective device in case of system faults or failures. 
2. ACT: A catalyst located after the turbocharger to increase the temperature of the exhaust gases. 
3. Fifth Injector: Injects fuel before the filter of the DPR system to burn the soot trapped there. 
4. Silencer (DPR Catalyst): Contains the soot filter elements and catalysts to reduce the amount of soot released into the environment. 

OPERATION PRINCIPLE 

• The ACT is a small catalyst located right after the engine, where exhaust gas temperatures are highest. This helps the upstream DOC (Diesel Oxidation Catalyst) immediately reach operational status (around 200°C or higher). 
• The fuel supplement valve injects fuel into the exhaust to further increase the exhaust temperature in the upstream DOC, activating it (around 200°C or higher). The temperature increase in the upstream DOC is due to the oxidation reaction of the injected fuel in the exhaust.
• Inside the silencer, there are three main components:
  1. The upstream DOC is used to convert hydrocarbons (unburned fuel) into heat through a chemical reaction (oxidation), thus further increasing the exhaust gas temperature. This helps raise the temperature during the DPR regeneration process and burn PM inside the DPR filter.
  2. The PM filter captures particulate matter from the exhaust. By filtering PM, the amount of PM released from the silencer is significantly reduced. Accumulated PM is burned (regenerated) inside the DPR filter by raising its temperature using exhaust gases.
  3. The downstream DOC is installed to prevent white smoke from escaping during engine startup.

BENEFITS 

The DPR treatment system is applied to the Hino Series 300 to meet the Euro 5 emission standard, complying with current regulations of the Vietnamese Government. The DPR system limits soot emissions, helping to reduce environmental pollution and protect human health, while also mitigating the factors contributing to climate change. 

Additionally, it demonstrates Hino’s commitment to the community by providing high-quality products and fulfilling environmental protection commitments.