Experimental Analysis of a Uniflow Scavenged Two-Stroke Concept
- Delivery
- Available on this site
- Format
- Price
- Non-members (tax incl.)：￥1,100 Members (tax incl.)：￥880
- Publication code
- 20229012
- Paper/Info type
- SETC
No.2022-32-0012
- Pages
- 1-8(Total 8 p)
- Date of publication
- Oct 2022
- Publisher
- JSAE
- Language
- English
- Event
- SETC2022
Detailed Information
| Author(E) | 1) Stefan Sturm, 2) Stephan Schmidt, 3) Michael Lang, 4) Roland Kirchberger |
|---|---|
| Affiliation(E) | 1) Graz University of Technology, 2) Graz University of Technology, 3) Graz University of Technology, 4) Graz University of Technology |
| Abstract(E) | The target data for a modern two-stroke engine used in the automotive sector, for example as a hybrid compound in a Plugin Hybrid Electric Vehicle (PHEV) or Range Extender Electric Vehicle (REX), include a range of demands and challenges to be a viable alternative to the four-stroke engine. A modern two-stroke concept must fulfill at least the same level of durability requirements and should have also advantages in terms of packaging, cost and weight. A major challenge is to generate a gas-exchange process which reduces the loss of fuel and air during the scavenging process to a minimum and enables a stochiometric exhaust gas. In a two-stroke engine, the in-cylinder burned gases of the previous combustion cycle are scavenged out of the cylinder by the inflowing fresh air. Therefore, an implementation of a 3-way catalyst as an effective aftertreatment system with operation at a stochiometric combustion requires a highly efficient scavenging and fuel injection strategy throughout the entire operational range to avoid possible losses of fresh air and fuel towards the exhaust line.One solution approach includes a novel uniflow scavenging concept with a direct injection system and separate auxiliaries. On the basis of a prior concept and simulation study [1,2], a promising two-stroke prototype was developed and prepared for testbench verification. In order to prove the functionality of this concept, a single cylinder research engine was built using an external electric scavenging blower, a separated cooling and lubrication system and an external high pressure fuel preparation. This method ensures a high level of design freedom during the development process and flexibility for the engine parameters on the testbench.For validation, the developed uniflow prototype concept is compared to a reference engine, a classic loop scavenging principle with the same geometrical dimensions. Both engine types are based on the same crankshaft, conrod, piston and crankcase with the same oil, fuel and blower periphery system, differing by cylinder and cylinder head due to the different scavenging principles. |
