Hino buses have fuss-free emission compliance

By: Graham Gardiner


Hino's latest range of buses are now equipped with Hino's exhaust gas recirculation (EGR) system, a pivotal feature in complying

Hino's latest range of buses are now equipped with Hino's exhaust gas recirculation (EGR) system, a pivotal feature in complying with ADR 80/02 emission standards.

Since January 1, 2008, all new heavy vehicles must be fitted with Australian Design Rule (ADR) 80/02-compliant engines.

The Hino EGR system mixes exhaust gases with the air intake to reduce combustion temperature and slow down combustion in the cylinder via an electronically-controlled and water-cooled exhaust gas recirculation valve.

The system significantly reduces nitrogen oxide (NOx) emissions.

A cooler is set in the path of the EGR, which further decreases the combustion temperature, reducing NOx emissions compared with non-cooled EGR systems.

Hino FD 230, RK8J and RN8J buses are all equipped with EGR.

All three buses are powered by Hino's 7.7-litre J08E engine.

The FD 230 is powered by a 168kW common-rail turbo diesel engine producing 686Nm of torque, while the RN8J and RK8J is equipped with a higher power rating of 190kW and 794Nm of torque (all ISO Net).

The alternate emission control system to EGR is SCR - selective catalytic reduction. The SCR system, however, needs a separate tank mounted on the vehicle which needs to be regularly filled with a urea product that is injected into the exhaust chamber.

"The EGR system is a fuss-free technology that is very effective in minimising emissions and thus complies with ADR80/02," says Kevin Fielding, manager bus product, Hino Australia.

The number of filling stations for SCR-equipped buses is limited, or requires the installation of filling tanks at depots.

"Compared to SCR, which requires the topping up of a separate tank in order to control emissions to adhere to ADR 80/02, EGR requires no additional input from the operator except for filling up on diesel - it's simply turn the key and go," he says.

Hino does not use the SCR system in its bus or truck range.

Hino's line-up of EGR-equipped vehicles was recently bolstered with three new SS 700 heavy-duty trucks

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