Patent ID: 7822530
Filing Date: 2010-10-26
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. A gas-fueled internal combustion engine operable with hydrogen gas as gaseous fuel, comprising: an in-cylinder injection valve for injecting the gaseous fuel directly into a combustion chamber; an ignition device arranged along the path of a stream of the gaseous fuel injected from the in-cylinder injection valve; and a control unit for controlling operation timing of the ignition device and operation timing of the in-cylinder injection valve to thereby change combustion types of the gaseous fuel injected from the in-cylinder injection valve, between premix combustion and diffusive combustion, wherein: the control unit calculates the air excess ratio based on a hydrogen supply amount and an air intake amount, and the control unit selects, as an operation mode of the internal combustion engine, a lean premix combustion operation for premixing and combusting the gaseous fuel at a lean air-fuel ratio, when the internal combustion engine is operated in an operation region where the air excess ratio can be kept substantially equal to or greater than 2, and selects, as the operation mode of the internal combustion engine, a diffusive combustion operation for diffusion-combusting the gaseous fuel, when the internal combustion engine is operated in an operation region where the air excess ratio cannot be kept substantially equal to or greater than 2.