Abstract:  For hydrogen fueled engine problems and exhaust gas heat loss, this paper presents a modified spark ignite (SI) electronic-controlled engine that used the hydrogen mixture as fuel which was generated from methanol dissociated by the exhaust heat. The performance and emission test on the engine was performed on the bench using AVL Digas 4000 Light emission analyzer. The results indicate that the engine fueled with dissociated methanol can operate for very lean mixture conditions because of its wide ignition limits. When the excess air ratio is 1.4, there is an order of magnitude reduction of  NO and CO comparing to the baseline engine, with NOx reduced at 90%, and CO almost by zero emission levels, but with HC being equivalent to gasoline. Equivalent specific fuel consumption of methanol is also reduced by 14.3%-30.7 % compared with gasoline. Therefore, applying dissociated methanol to SI electronic-controlled engine is a new approach to clean and high efficiency combustion with methanol fuel.

Key words: spark ignite (SI) engines, hydrogen mixture, methanol, exhaust heat