Biography - Thailand Automotive Institute

Development of Natural Gas Engine for Heavy Duty Truck
Mr. Chakrit Jailor
Chief of Medium Duty Truck Division,
Commercial Vehicle Product Planning & Engineering Department, Isuzu Technical Center of Asia Co.,Ltd.
E-mail: chakrit_jailor@ita.isuzu.co.jp
Abstracts
The increase of diesel price had a big affect on the transportation industry that operated primary by using
diesel engine. Thus the adjustment of diesel engine for the renewable or alternative energy was focused in
order to be the way to reduce expenses. Natural gas was the outstanding alternative energy that Isuzu
researched to use for the regular diesel engine. The methodology of Isuzu diesel engine development for
efficient use with natural gas (dedicated or mono gas system engine) was firstly to tune up the engine
compression ratio, secondly to renew the intake system, thirdly to install the fuel control system as well as
exhaust-gas control system.
The only natural gas-used Isuzu engine was officially experimented in Thai transportation industry in 2007.
The prototype vehicle, in which natural gas-used Isuzu engine was assembled, was produced as the Bangkok
Mass Transit Authority’s bus. The bus was experimentally used in the daily regular operation, whereas the gas
control system was tuned up especially for Thai gas.
The experimental result was satisfied both energy consumption ratio and driving efficiency. As a
consequence, the achievement brought about the production of Isuzu’s heavy duty trucks which started
marketing on 2008.
Biography
Mr. Chakrit Jailor is the chief engineer of the Medium Heavy Duty Truck Division,
Commercial Vehicle Product Planning & Engineering Department, Isuzu Technical
Center of Asia Co.,Ltd. He has a B.Eng degree in Mechanical Engineering from the
Faculty of Engineering, Khonkaen University. Mr.Chakrit also succeeded 3-years
Engineering Apprenticeship Programme from Isuzu Motors, Kawasaki, Japan.
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