[특허]Powerplant and related control system and method

AeroVironment Inc.

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Powerplant and related control system and method

국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F02M-021/02 F02D-041/30
미국특허분류(USC)	123/676; 123/525; 123/431
출원번호	US-0507072 (2012-05-31)
등록번호	US-8479718 (2013-07-09)
발명자 / 주소	Brooks, Alexander Nelson Daley, James Gallagher
출원인 / 주소	AeroVironment Inc.
대리인 / 주소	Aagaard, Eric J.
인용정보	피인용 횟수 : 0 인용 특허 : 27

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A hydrogen fueled powerplant including an internal combustion engine that drives a motor-generator, and has a two-stage turbocharger, for an aircraft. A control system controls the operation of the motor-generator to maintain the engine at a speed selected based on controlling the engine equivalence ratio. The control system controls an afterburner, an intercooler and an aftercooler to maximize powerplant efficiency. The afterburner also adds power to the turbochargers during high-altitude restarts. The turbochargers also include motor-generators that ex...

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1. A powerplant, comprising: an engine configured to react a first reactant with a gaseous stream of second reactant to produce energy and an exhaust stream, the gaseous stream of second reactant being provided to the engine at a flow rate; anda control system configured to control the flow rate of the gaseous stream of second reactant based on the operating condition of the engine such that an exhaust stream temperature is maintained below a temperature limit. 2. The powerplant of claim 1, and further comprising a temperature sensor positioned and configured to sense the temperature of the exhaust stream, wherein the control system is configured to monitor the temperature of the exhaust stream using the sensor, and wherein the control system is configured to control the flow rate of the gaseous stream of second reactant based on the monitored temperature. 3. The powerplant of claim 1, and further comprising a compressor configured to pressurize the gaseous stream of second reactant supplied to the engine, wherein the control system is configured to control the flow rate of the gaseous stream of second reactant by controlling the operation of the compressor. 4. The powerplant of claim 3, and further comprising a turbine, wherein the compressor is driven in rotation by a driving force from the turbine, wherein the turbine is propelled by the exhaust stream, and wherein the control system is configured to control the operation of the compressor by controlling the driving force from the turbine. 5. The powerplant of claim 4, and further comprising an afterburner in the exhaust stream intermediate the engine and the turbine, the afterburner being configured to react additional reactants in the exhaust stream, wherein the control system is configured to control the driving force from the turbine by controlling the amount of additional reactants reacted in the exhaust stream. 6. The powerplant of claim 5, wherein the afterburner is a catalytic afterburner. 7. The powerplant of claim 5, and further comprising an injector configured to inject a third reactant in the exhaust stream for reaction by the afterburner, wherein the control system is configured to control the amount of additional reactants reacted in the exhaust stream by controlling the quantity of the third reactant injected into the exhaust stream. 8. The powerplant of claim 7, wherein: the first reactant is a first fuel;the second reactant is a gaseous oxidizer; andthe third reactant is a second fuel. 9. The powerplant of claim 8, wherein the first fuel is hydrogen, wherein the second fuel is hydrogen, and wherein the engine is configured to operate at an equivalence ratio of less than one. 10. The powerplant of claim 1, wherein the temperature limit is a constant. 11. The powerplant of claim 1, wherein the engine drives a generator that generates electrical power. 12. The powerplant of claim 1, wherein the engine is a reciprocating internal combustion engine configured to combust hydrogen with air. 13. A method of limiting the temperature of an exhaust stream of an engine configured to react a first reactant with a gaseous stream of second reactant to produce energy and the exhaust stream, the gaseous stream of second reactant being provided to the engine at a flow rate, comprising: monitoring information indicative of an exhaust stream temperature; andcontrolling the flow rate of the gaseous stream of second reactant based on the monitored information such that the exhaust stream temperature is maintained below a temperature limit. 14. The method of claim 13, wherein the step of monitoring includes the step of sensing an exhaust stream temperature; and wherein the step of controlling comprises controlling the flow rate of the gaseous stream of second reactant based on the sensed exhaust stream temperature such that the exhaust stream temperature is maintained below a temperature limit. 15. The method of claim 13, wherein the engine is provided with a compressor configured to pressurize the gaseous stream of second reactant supplied to the engine,a turbine configured to drive the compressor, and configured to be propelled by the exhaust stream,a catalytic afterburner in the exhaust stream intermediate the engine and the turbine, the afterburner being configured to react additional reactants in the exhaust stream, andan injector configured to inject a third reactant in the exhaust stream for reaction by the afterburner;wherein in the step of controlling, the flow rate of the gaseous stream of second reactant is controlled by controlling the quantity of the third reactant injected into the exhaust stream by the injector. 16. An apparatus for limiting the temperature of an exhaust stream of an engine configured to react a first reactant with a gaseous stream of second reactant to produce energy and the exhaust stream, the gaseous stream of second reactant being provided to the engine at a flow rate, comprising: a means for monitoring information indicative of an exhaust stream temperature; anda means for controlling the flow rate of the gaseous stream of second reactant based on the monitored information such that the exhaust stream temperature is maintained below a temperature limit. 17. The apparatus of claim 16, and further comprising: a compressor configured to pressurize the gaseous stream of second reactant supplied to the engine;a turbine configured to drive the compressor, and configured to be propelled by the exhaust stream;a catalytic afterburner in the exhaust stream intermediate the engine and the turbine, the afterburner being configured to react additional reactants in the exhaust stream; andan injector configured to inject a third reactant in the exhaust stream for reaction by the afterburner;wherein the means for controlling is configured to control the flow rate of the gaseous stream of second reactant by controlling the quantity of the third reactant injected into the exhaust stream by the injector.

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Powerplant and related control system and method

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