Fumigation system for a diesel engine
First Claim
1. A gaseous-fuel fumigation system for interconnection to a diesel engine, comprising:
- a valve disposed in a flow path between a gaseous-fuel supply and an air intake stream of a diesel engine, the valve being operative to regulate a flow volume of a gaseous-fuel through the flow path;
an oxygen sensor operative to generate a signal indicative of an oxygen content of an exhaust stream of the diesel engine;
a controller operative to receive the signal from the oxygen sensor and adjust the valve to regulate the flow volume of the gaseous-fuel through the flow path to maintain a predetermined minimum oxygen content in the exhaust stream.
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Accused Products
Abstract
A system and method is provided to reduce particulate and NOx emissions from diesel engines through the use of a duel-fuel fumigation system. The system injects a gaseous-fuel flow into the air intake stream of a diesel engine. This results in more complete combustion within the engine as well as reduced diesel fuel usage, which each work to reduce emission outputs of the engine. As presented, the system is operative to meter the gaseous-fuel flow into the diesel engine based on one or more engine parameters such as, for example, exhaust gas temperature, exhaust oxygen levels, engine speed and/or engine load. Monitoring one or more engine parameters allows fine-tuning the flow of gaseous fuel into the engine and thereby prevents loss of engine power at high-end loads while maintaining favorable emission outputs over substantially the entire operating range of the engine.
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Citations
20 Claims
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1. A gaseous-fuel fumigation system for interconnection to a diesel engine, comprising:
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a valve disposed in a flow path between a gaseous-fuel supply and an air intake stream of a diesel engine, the valve being operative to regulate a flow volume of a gaseous-fuel through the flow path;
an oxygen sensor operative to generate a signal indicative of an oxygen content of an exhaust stream of the diesel engine;
a controller operative to receive the signal from the oxygen sensor and adjust the valve to regulate the flow volume of the gaseous-fuel through the flow path to maintain a predetermined minimum oxygen content in the exhaust stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for operating a gaseous-fuel fumigation system interconnected to a diesel engine, comprising:
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establishing a gaseous-fuel flow path between a gaseous-fuel supply and an intake stream of a diesel engine;
identifying an oxygen content of an exhaust stream of the engine;
based on the oxygen content, regulating a flow volume of gaseous-fuel through the flow path to maintain a predetermined oxygen content in the exhaust stream; and
injecting the second flow volume into an air intake stream of the engine. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A gaseous-fuel fumigation system for interconnection to a diesel engine, comprising:
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an oxygen senor for generating an output related to an oxygen content of an exhaust gas stream;
an electronic control unit including programming operable to;
receive the output related to the oxygen content of the exhaust gas stream; and
generate a control output signal for adjusting a flow volume of a gaseous fuel injected into an intake of the engine; and
a regulator operative to receive the control output signal and regulate gaseous-fuel flow through a flow path between a gaseous fuel supply and the engine. - View Dependent Claims (18, 19, 20)
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Specification