Thesis work is a good way to come in contact with Scania and to build relations for the future. The thesis work will be performed at the gas exchange group, ENMGP, at the engine development department. ENMGP are responsible for the performance of the air handling in combustion engines. We primarily use system simulation tools such as GT-suite to capture the behaviour of the gas exchange system. Among our responsibilities are turbo matching, high altitude performance & installation requirements and we are very much involved in the development of new combustion engines regardless of type of fuel.
Background
One of the most promising possibilities of converting hydrogen (H2) to mechanical power in a truck application with zero tail pipe emissions is to burn it in a spark ignited otto engine at high Lambda (air to fuel ratio) without aftertreatment system.
Today Scania has otto engines running on methane (CH4) at Lambda equal to 1 (stoichiometry) with a three way catalyst aftertreatment. These engines are based on the current Diesel engines (5 cyl 9 litre and 6 cyl 13 litre). The intention is here to use the latest 13 litre Diesel engine as a base for a spark ignited hydrogen engine. In order to obtain very low engine out NOx levels the engine needs to run at a high Lambda (>2). Among the difficulties with this concept are e.g. that the specific power is low and that the response is poor.
Goal
The purpose here is to investigate possible ways to increase the response of an spark ignited otto engine running on hydrogen at high Lambda values. To be able to add more fuel quickly the gas exchange system must be able to quickly provide increased charge air. The turbo charger used the exhaust energy to increase its speed and thus the boost pressure but if no extra fuel can be added this will be very slow so something else needs to be added to the gas exchange system to help increasing boost pressure under transients.
Work description
- Literature study of possible ways/concepts to increase the boost pressure at low engine speeds
- Running engine simulations in GT-Power in order to test/validate these concepts
MSc program
Engineering Science
n:o students: 1
Start date: Januari 2024
Expected time: 20 weeks
Contact persons
Björn Lindgren, head of NMGP, +46855380573, bjorn.lindgren@scania.com
Dag Eriksson, NMGP, +4655370057, dag.eriksson@scania.com
Per Stålhammar, STA NPR, +46855370847, per.stalhammar@scania.com
Application
The application should include CV, personal letter and a grade transcript
About Scania
Scania is a world-leading provider of transport solutions. Together with our partners and customers we are driving the shift towards a sustainable transport system. In 2022, we delivered 80,238 trucks, 4,994 buses as well as 13,400 industrial and marine power systems to our customers. Net sales totalled to over SEK 170 billion, of which 21 percent were services related. Founded in 1891, Scania now operates in more than 100 countries and employs some 57,000 people. Research and development are mainly concentrated in Sweden. Production takes place in Europe and Latin America with regional product centres in Africa, Asia and Eurasia. Scania is part of TRATON GROUP. For more information visit: www.scania.com
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