The Effect of Control Strategies on the Gasoline Compression Ignition (GCI) Engine: Injection Strategy, Exhaust Residual Gas Strategy, Biodiesel Addition Strategy, and Oxygen Content Strategy

Abstract

In the internal combustion engine types, the gasoline compression ignition engine (GCI engine) presents the potential and effective method to improve engine thermal efficiency and lower pollution emissions when compared to the spark-ignition engine (SI) and the compression ignition engine (CI engine), respectively. To improve those advantages of the GCI engine, new engine technologies are being developed to help the engine efficiently work with higher compression ratios or lower octane gasoline fuel at part load conditions. However, high smoke, soot, HC and CO formations, the part-load stability of the combustion phase, or autoignition at high load conditions are still challenging with the GCI engine. This chapter will introduce some technologies that help solve the GCI engine's challenges, these technologies are such as: injection strategy, exhaust residual gas strategy, biodiesel addition, and oxygen content. After the aforementioned technological implementations, a detailed investigation will be carried out to lay the scope on the GCI engine performance and its emission characteristics. Multiple injections may help improve combustion stability and engine efficiency when compared to a single injection strategy. The HC and CO emissions can be decreased when the engine applies a multiple injection strategy and GB05 as fuel. The increase in EGR helps to reduce autoignition for both single and numerous ignition strategies. The oxygen concentration has a sensitive effect on the delay of the ignition process. The reduced amount of oxygen concentration induces an increase in the ignition delay, which helps to reduce the auto-ignition.KeywordsGCI engineInjection strategyEGRGB blendsOxygen concentrate