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Emission Reduction Technology Using Secondary Air for Generator Engine

Article of Honda R&D Technical Review Vol.27 No.2


An emission reduction system that uses secondary air injection and a catalyst was developed to meet emission standards for domestic gasoline engine generators enacted by India in 2014.
Gasoline engine generators require a compact size and high portability, so there are many restrictions on the exhaust system layout, and it has been a challenge to realize secondary air injection using the exhaust pulsation effect.
This development discovered the proper exhaust pipe and secondary air pipe lengths that increase the pulsation effect of the secondary air pipe, and realized a compact system that complies with both emission and generator noise standards and fits within the mass-production generator chassis.
In addition, regarding emission measurement methods, the raw gas measurement method and dilute gas measurement method were compared and verified, and a measurement method that does not influence the secondary air quantity was found.


(1) Indian emission standards for generator sets on petrol and kerosene
(2) Yasoshina, S., Saito, R.: Pulsed Secondary Air Injection System for Emission Reduction in Small Generator Sets, SAE Technical Paper, 2014-32-0035, (2014)
(3) ISO 8178-1:2006 2nd edition: Exhaust emission measurement

Author (organization or company)

Ryo SAITO(Power Products R&D Center)、Takanori SATO(Power Products R&D Center)、Sayaka YASOSHINA(Power Products R&D Center)、Yusuke NINOMIYA(Power Products R&D Center)

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