An Investigation of a New Type Direct-injection Stratified- Charge Combustion System for Gasoline Engines

1996 ◽  
Author(s):  
Hui Zhao ◽  
Xiaofeng Yang ◽  
Longbao Zhou ◽  
Shenghua Liu
Keyword(s):  
Direct Injection ◽  
Combustion System ◽  
Stratified Charge ◽  
Gasoline Engines ◽  
New Type

Microwave-based ignition principle for gasoline engines with direct injection and spray guided combustion system

MTZ worldwide ◽  
2006 ◽  
Vol 67 (6) ◽  
pp. 29-31 ◽  
Author(s):  
Maurice Kettner ◽  
Andreas Nauwerck ◽  
Ulrich Spicher ◽  
Jürgen Seidel ◽  
Klaus Linkenheil
Keyword(s):  
Direct Injection ◽  
Combustion System ◽  
Gasoline Engines

Study of Multimode Combustion System With Gasoline Direct Injection

2006 ◽  
Vol 129 (4) ◽  
pp. 1079-1087 ◽  
Author(s):  
Zhi Wang ◽  
Jian-Xin Wang ◽  
Shi-Jin Shuai ◽  
Yan-Jun Wang ◽  
Guo-Hong Tian ◽  
...  
Keyword(s):  
Fuel Injection ◽  
Direct Injection ◽  
Spark Ignition ◽  
Gasoline Direct Injection ◽  
Compression Ignition ◽  
Combustion System ◽  
Stratified Charge ◽  
Part Load ◽  
Valve Overlap ◽  
Homogeneous Charge

In this paper, a multimode combustion system was developed in a gasoline direct injection engine. A two-stage fuel-injection strategy, including flexible injection timings and flexible fuel quantity, is adopted as a main means to form desired mixture in the cylinder. The combustion system can realize five combustion modes. The homogeneous charge spark ignition (HCSI) mode was used at high load to achieve high-power output density; stratified charge spark ignition (SCSI) was adopted at intermediate load to get optimum fuel economy; stratified charge compression ignition (SCCI) was introduced at transient operation between SI and CI mode. Homogeneous charge compression ignition (HCCI) was utilized at part load to obtain ultralow emissions. Reformed charge compression ignition (RCCI) was imposed at low load to extend the HCCI operation range. In SI mode, the stratified concentration is formed by introducing a second fuel injection in the compression stroke. This kind of stratified mixture has a faster heat release than the homogeneous mixture and is primarily optimized to reduce the fuel consumption. In CI mode, the cam phase configurations are switched from positive valve overlap to negative valve overlap (NVO). The test results reveal that the CI combustion is featured with a high gradient pressure after ignition and has advantages in high thermal efficiency and low NOx emissions over SI combustion at part load.

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