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Bi-fuel engine using hydrogen

An internal combustion engine, engine technology, applied in combustion engines, internal combustion piston engines, engine control and other directions, can solve problems such as increasing NOx emissions

Inactive Publication Date: 2009-03-18
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, hydrogen combustion is limited to operating at equivalence ratios of about 0.5 or less due to increased combustion harshness, which, if problematic, can rapidly increase NOx emissions

Method used

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Examples

Experimental program
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Embodiment Construction

[0014] figure 1 A four-cylinder internal combustion engine 10 is shown by way of example. Internal combustion engine 10 is supplied with air through intake manifold 12 and exhaust gases through exhaust manifold 14 . An intake conduit upstream of the intake manifold 12 contains a throttle valve 32 which, when activated, controls air flow to the internal combustion engine 10 . Sensors 34 and 36 installed in intake manifold 12 measure air temperature and mass air flow (MAF), respectively. Sensor 31 located in intake manifold 12 downstream of throttle valve 32 is a manifold absolute pressure (MAP) sensor. Partially closing throttle 32 causes the pressure in intake manifold 12 to drop compared to the pressure on the upstream side of throttle 32 . When there is a pressure drop in the intake manifold 12 , exhaust is forced to flow through an exhaust gas recirculation (EGR) conduit 19 connecting the exhaust manifold 14 to the intake manifold 12 . EGR valve 18 is located in EGR con...

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Abstract

The invention relates to a bi-fuel engine using hydrogen. A method is disclosed for making a transition from fueling an engine with hydrogen to another fuel. That other fuel may be gasoline, a gasoline and alcohol mixture, or gaseous fuels, as examples. The other fuel has the capability of providing higher BMEP than the hydrogen because of better air utilization and because the other fuel occupies less volume of the combustion chamber. Because a desirable equivalence ratio to burn hydrogen is at 0.5 or less and a desirable equivalence ratio to burn other fuel is at 1.0, when a demand for BMEPthat leads to a transition change from hydrogen fuel to the other fuel, the amount of air supplied to the engine is decreased to provide more torque and vice versa. During a transition in which liquid fuel supply is initiated, it may desirable to continue to provide some hydrogen, not leaner than 0.1 hydrogen equivalence ratio.

Description

technical field [0001] The present invention discloses a method of operating an internal combustion engine supplied with both hydrogen fuel and another fuel. Background technique [0002] Because of the focus on greenhouse gases emitted from carbonaceous fuels such as gasoline, diesel, and alcohol-based fuels, there has been intense interest in motor vehicles fueled with hydrogen that produces water upon combustion. Since hydrogen is a gaseous fuel occupying a large volume in the cylinder, especially compared to dense fuels like gasoline or diesel fuel, hydrogen fueled internal combustion engines experience lower power output compared to gasoline or diesel powered engines. Furthermore, hydrogen combustion is limited to operation at equivalence ratios of about 0.5 or less due to increased combustion harshness, which, if problematic, can rapidly increase NOx emissions. An equivalence ratio of 1 is stoichiometric, meaning that the ratio of fuel to air is such that all the oxyg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D19/06
CPCF02D19/0644F02D19/0692F02D19/084F02D19/061F02D19/081Y02T10/36F02D19/0689Y02T10/30
Inventor 威廉·弗朗西斯·施托克豪森戴安娜·道恩·布雷霍布
Owner FORD GLOBAL TECH LLC
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