Faculty Members

Faculty of Engineering

Department of Mechanical Engineering

Key words
Heat engines, environmental load reduction technology, energy utilization, combustion

Doctor of Engineering / Professor

Haruyoshi Ida


Graduate School of Engineering, Fukui University of Technology (Doctoral Program Credits Completed)

Professional Background

Associate professor at Fukui University of Technology

Consultations, Lectures, and Collaborative Research Themes

Technical consultations concerning performance tests and exhaust gas measurements of small diesel engines. Lectures on engine performance and the mechanics of automobiles.

Main research themes and their characteristics

「Exhaust gas reduction in diesel engines using bio fuel」

 The combustion process and fuel used in diesel engines influence the generation of toxic substances such as PM (particulate matter) and NOx (nitrogen oxides). BDF (bio diesel fuel), which has recently drawn attention as an alternative fuel containing a lot of oxygen, promotes diesel engine combustion, thus promising improvements in thermal efficiency. However, minute atomization is not formed easily with BDF because of its high kinematic viscosity, so that PM emission tends to increase compared to the use of gas oil (Tab.1).
 This study examines the relations between exhaust gas characteristics and combustion characteristics in performance tests of a small diesel engine (Tab.2) with a common rail fuel injection system, which changes fuel injection pressure by using gas oil and BDF. Results clarified that thermal efficiency improved when BDF was injected at high pressure (Fig.1). Furthermore, previous research has found that using fuel with a mix of gas oil and BDF improves the exhaust gas characteristics of diesel engines, compared to using BDF alone.

 Elsewhere, EGR is widely used to reduce the NOx concentration in diesel engines, but it tends to increase PM emissions.
 Therefore, the purpose of this study is to grasp the effects of mixed gas oil and BDF fuel on the exhaust gas characteristics of diesel engines with EGR. To this end, engine performance testing using mixed gas oil and BDF fuels with different oxygen content ratios was performed.
The results showed that excellent exhaust gas characteristics can be obtained by using BDF appropriately mixed with gas oil when the EGR rate is increased within the range where normal operation can be maintained (Fig.2, Fig.3).

Major academic publications

H.Ida, and K.Khiriwan, “Effects of Mixed Gas Oil and BDF Fuel on Exhaust Gas Characteristics of Diesel Engines with EGR”, MEMOIRS OF FUKUI UNIVERSITY OF TECHNOLOGY, No.49(2019), pp.27-32.