Gas-Fueled Internal Combustion Engine and Control Method for Gas-Fueled Internal Combustion Engine
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Accused Products
Abstract
In a gas-fueled internal combustion engine, an ignition device (16, 6O, 62, 64, 66) is arranged in a moving direction of a stream of the gaseous fuel injected from an in-cylinder injection valve (40) in a combustion chamber. The ignition device can directly ignite the fuel stream and diffusive combustion of the gaseous fuel can be executed by sequentially injecting the gaseous fuel toward a flame created by the ignition. Further, premix combustion of the gaseous fuel can also be performed by igniting an air-fuel mixture after the gaseous fuel injected from the in-cylinder injection valve has been sufficiently mixed with the air. As an operation mode of the engine, a lean premix combustion operation is selected when the engine is operated in a prescribed operation region, and the operation mode is changed to a diffusive combustion operation when the engine is operated in a higher load operation region than the prescribed operation region.
29 Citations
43 Claims
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1-23. -23. (canceled)
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24. A gas-fueled internal combustion engine operable with hydrogen gas as gaseous fuel, comprising:
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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. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. A control method for a gas-fueled internal combustion engine operable with hydrogen gas as gaseous fuel, including an in-cylinder injection valve for injecting the gaseous fuel directly into a combustion chamber, and an ignition device arranged along the path of a stream of the gaseous fuel injected from the in-cylinder injection valve, comprising:
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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; and calculating an air excess ratio based on a hydrogen supply amount and an air intake amount, wherein, 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 is selected when the internal combustion engine is operated in an operation region where the air excess ratio an be kept substantially equal to or greater than 2, and a diffusive combustion operation for diffusion-combusting the gaseous fuel is selected 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.
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Specification