In English

Förbränning av biogas/metan i en EcoMarathonmotor

Dan Andersson ; Felix Eriksson ; Henrik Karlsson ; Niklas Axelsson ; Björn Steinwall Jivenberg ; Anton Stenstrand
Göteborg : Chalmers tekniska högskola, 2016. Kandidatarbete / Institutionen för tillämpad mekanik, Chalmers tekniska högskola, ISSN 1654-4676; 2016:04, 2016.
[Examensarbete för kandidatexamen]

This report is about the process of converting a petrol-fuelled Honda GX35 engine to run on methane gas. The future goal is to use the engine in the engineering competition Shell Eco-marathon, where the aim is to drive a vehicle as far as possible with a set amount of fuel. To enable methane fuelling, the carburator of the GX35 was replaced with a gas fuel injector from the engine accessory company Ecotrons. This was attached to an aluminium intake pipe constructed by the project group. A new flywheel was constructed, equipped with twelve magnetic detection points instead of one for more accurate detection of the crankshaft position. A magnet was also attached to the upper cam pulley to enable position detection. The original exhaust system was replaced by a holder of a lambda sensor and a straight exhaust pipe. Together with the engine control unit (ECU) KATLA, developed earlier for a bachelor’s thesis at Chalmers, this enabled detailed control of ignition and fuel injection, as well as measurement of the air-fuel ratio. In order to test the engine with a load, a brake device was constructed. A moped was acquired, whose gearbox and rear brake was used to brake and gear down the output shaft of the methane engine. The flywheel of the methane engine was connected to the flywheel of the moped through a vibration reducing rubber disc and a steel adapter. The rear wheel of the moped was lifted from the ground with a support so that it could rotate freely. By doing this, the load of the engine could be controlled with the rear brake pedal of the moped. Methane was not available for the project group, so the engine was tested with liquefied petroleum gas instead, which is another gaseous fuel. Before the engine was started, the flow rate through the gas injector was measured. This data was used to set the fuel parameters in the ECU. With some minor adjustments the engine ran well during testing.

Publikationen registrerades 2017-01-02. Den ändrades senast 2017-08-02

CPL ID: 246586

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