Abstract:
The present invention provides friction-modifying fuel additives and fuel compositions including an alkanolamine, which are effective for enhancing engine performance wherein the additive is free of esters or the ratio of amides to esters is greater than 1.4 to 1 and methods for making and using the same.
Abstract:
A conformable fuel cell is provided which includes a basic structure that provides flexibility while providing a high compression along the active surface of the fuel cell's membrane electrode assembly, which can be achieved by an injection-molded frame. A suitable fuel is delivered to the anode aspect of the fuel cell. Effective water management could also be provided by appropriate diffusion layers. The fuel cell can be contour-molded to a desired shape, or can be constructed of an array of flexibly connected individual fuel cells that overall have a curvilinear shape, or can be constructed as a pliable fuel cell that can be incorporated into an application device or an article of clothing.
Abstract:
A fuel cell which provides improved performance during a cold start. Several embodiments are provided to enable the controlled introduction of fuel into the cathode of the fuel cell such that oxidation occurs, heat is released and the temperature of the fuel cell is raised. Such fuel may be introduced into the cathode directly or may be introduced into the anode and allowed to crossover an electrolytic membrane. Alternatively, the fuel may be directed through a special conduit which allows oxidation of some of the fuel as it flows through.
Abstract:
For a direct oxidation fuel cell system in which the source fuel is diluted with a diluting fluid prior to entering the fuel cell generally, and for a Direct Methanol Fuel Cell System (DMFC) in which the methanol source fuel is diluted with water, the dielectric constant of the fuel mix comprising the source fuel and the diluting fluid is measured to determine the relative proportions of source fuel and diluting fluid within this fuel mix. This measurement may then be used in a feedback loop to control the subsequent mixing of the source fuel with the diluting fluid, and in particular, to adjust the mix in the event the fuel mix is too rich or too dilute as compared to a desired mixing proportion. Additionally, a second dielectric constant measurement is used to determine the source fuel level of a fuel tank providing source fuel to the fuel cell. Finally, an optional telecommunications link is used to automatically order a source fuel refill when the source fuel runs low.
Abstract:
Apparatus and methods for regulating methanol concentration in a direct methanol fuel cell system are provided. The apparatus and methods do not require a methanol concentration sensor. One or more operating characteristics of the fuel cell, such as the potential across the load, open circuit potential or potential at the anode proximate to the end of the fuel flow path, are used to actively control the methanol concentration.
Abstract:
A method and apparatus for managing heat generated by a device that is powered at least in part by a direct oxidation fuel cell. Additional heat tends to improve the reaction in the direct oxidation fuel cell, and so unwanted heat produced by a powered device can be harnessed to increase the temperature of the reaction in the direct oxidation fuel cell. By doing so, the performance of the fuel cell can be enhanced and the temperature of the heat-generating portion of the device maintained.
Abstract:
Apparatus and methods for regulating methanol concentration in a direct methanol fuel cell system without the need for a methanol concentration sensor. One or more operating characteristics of the fuel cell, such as the potential across the load, open circuit potential, potential at the anode proximate to the end of the fuel flow path or short circuit current of the fuel cell, are used to actively control the methanol concentration.
Abstract:
A fuel cell system is specially adapted to provide enhanced air purification for stationary and mobile applications. An air purification subsystem may be installed along a cathode flow path to enhance air purification by utilization of fuel cell operating conditions. Synergistic automotive, residential, commercial and agricultural applications are thus provided. Air purification subsystems may include, for example, a multi-purpose platinum-based catalyst configuration adapted to convert carbon monoxide into carbon dioxide and ozone into diatomic oxygen.
Abstract:
A diagnostic method and method of controlling the preferential oxidation of CO in a reformed fuel gas stream includes periodically modulating the amount of air supplied to a preferential oxidation reactor at a specific operating characteristic of the fuel cell, such as power output or fuel flow rate, to determine the amount of air necessary to reduce the level of CO to an acceptable level.
Abstract:
A liquid jet fuel composition comprising:(a) a major portion of a liquid fuel; and(b) a minor effective portion of a thermal stabilizing additive prepared by(i) reacting a polyamine, an aldehyde and a phenol containing active hydrogen to form a phenol - aldehyde - amine condensate; and(ii) reacting said phenol - aldehyde - amine condensate and a succinic acid anhydride bearing a polyolefin - derived substituent containing residual unsaturation, thereby forming a phenol - aldehyde amine Mannich condensate polyamine succinimide product additive; and(iii) recovering said product additive.