CN116447005A - Elliptic piston rotary engine based on liquid hydrogen fuel and control method thereof - Google Patents

Elliptic piston rotary engine based on liquid hydrogen fuel and control method thereof Download PDF

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CN116447005A
CN116447005A CN202310307595.4A CN202310307595A CN116447005A CN 116447005 A CN116447005 A CN 116447005A CN 202310307595 A CN202310307595 A CN 202310307595A CN 116447005 A CN116447005 A CN 116447005A
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output signal
temperature sensor
air
engine
hydrogen
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纪常伟
史梦圆
汪硕峰
杨金鑫
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Beijing University of Technology
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Beijing University of Technology
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B53/00—Internal-combustion aspects of rotary-piston or oscillating-piston engines
    • F02B53/10—Fuel supply; Introducing fuel to combustion space
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B53/00—Internal-combustion aspects of rotary-piston or oscillating-piston engines
    • F02B53/02—Methods of operating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B53/00—Internal-combustion aspects of rotary-piston or oscillating-piston engines
    • F02B53/04—Charge admission or combustion-gas discharge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B53/00—Internal-combustion aspects of rotary-piston or oscillating-piston engines
    • F02B53/04—Charge admission or combustion-gas discharge
    • F02B53/08—Charging, e.g. by means of rotary-piston pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B55/00—Internal-combustion aspects of rotary pistons; Outer members for co-operation with rotary pistons
    • F02B55/02—Pistons

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

本发明设计了一种基于液氢燃料的椭圆活塞旋转发动机及其控制方法，属于发动机领域，具体涉及一种根据发动机转速，通过调节冷风风扇流量大小来控制氢气的进气温度的控制策略。本发明根据转速、冷却介质温差和流量、液氢前后温差与流量的输出信号为依据，将发动机转速划分为三个区间，通过冷却风扇来调节不同转速下氢气的进气温度，利用其低温及汽化潜热的特性来抑制发动机回火、爆震和异常燃烧现象发生。

The invention designs an elliptical piston rotary engine based on liquid hydrogen fuel and a control method thereof, which belongs to the field of engines, and specifically relates to a control strategy for controlling the intake temperature of hydrogen by adjusting the flow rate of a cooling fan according to the engine speed. According to the rotation speed, the temperature difference and flow rate of the cooling medium, and the output signals of the temperature difference and flow rate of liquid hydrogen, the engine speed is divided into three intervals, and the intake temperature of hydrogen gas at different speeds is adjusted through the cooling fan, and the low temperature and The characteristics of the latent heat of vaporization can inhibit the occurrence of engine flashback, knocking and abnormal combustion.

Description

一种基于液氢燃料的椭圆活塞旋转发动机及其控制方法An elliptical piston rotary engine based on liquid hydrogen fuel and its control method

技术领域technical field

本发明设计了一种基于液氢燃料的椭圆活塞旋转发动机及其控制方法，属于内燃机技术领域。The invention designs an elliptical piston rotary engine based on liquid hydrogen fuel and a control method thereof, belonging to the technical field of internal combustion engines.

背景技术Background technique

氢能具有零排放、可再生、高能量密度等特点。液氢储存是满足大规模与长距离的运输的理想方式。液氢作为燃料时，发动机采用进气道喷射，液氢其汽化潜热的特性，可以有效的抑制发动机的回火、爆震与异常燃烧现象。Hydrogen energy has the characteristics of zero emission, renewable and high energy density. Liquid hydrogen storage is an ideal way to meet large-scale and long-distance transportation. When liquid hydrogen is used as fuel, the engine uses intake port injection. The latent heat of vaporization of liquid hydrogen can effectively suppress the phenomenon of tempering, knocking and abnormal combustion of the engine.

椭圆活塞旋转发动机作为一款高动力性发动机，很好弥补了氢能作为燃料时动力不足的问题；椭圆活塞旋转发动机体积小、功率密度大可以应用于寒冷高空运行的无人机领域，液氢由于其特性可以作为其发动机燃料。因此，本申请设计了一种基于液氢燃料的椭圆活塞旋转发动机及其控制方法，可以很好的利用液氢自身特性，抑制发动机回火、爆震与异常燃烧现象。As a high-power engine, the elliptical piston rotary engine makes up for the lack of power when hydrogen is used as fuel; the elliptical piston rotary engine is small in size and high in power density and can be applied to the field of unmanned aerial vehicles operating in cold and high altitudes. Liquid hydrogen Due to its characteristics it can be used as fuel for its engine. Therefore, this application designs an elliptical piston rotary engine based on liquid hydrogen fuel and its control method, which can make good use of the characteristics of liquid hydrogen and suppress engine backfire, knocking and abnormal combustion.

发明内容Contents of the invention

为了提升椭圆活塞旋转发动机性能，减少回火等现象，本发明设计了一种基于液氢燃料的椭圆活塞旋转发动机及其控制方法，具体涉及一种根据发动机转速，通过调节冷风风扇流量大小来控制氢气的进气温度的控制策略，包括：进气管路(P1)，其上串联分别为空气滤清器(1)、第一空气流量计(2)、节气门(3)、进气压力传感器(4)；液氢管路(P2)，其上串联分别液氢罐(13)、第一温度传感器(12)、换热器(11)、第二温度传感器(10)、液氢流量计(9)、减压阀(8)、压力调节阀(7)、阻火器(6)、氢气喷嘴(5)；冷却管路(P3)，其上串联分别为第二空气流量计(14)，第三温度传感器(15)、换热器(11)、第四温度传感器(16)、冷却风扇(17)。In order to improve the performance of the elliptical piston rotary engine and reduce flashback and other phenomena, the present invention designs an elliptical piston rotary engine based on liquid hydrogen fuel and its control method, which specifically relates to a control method based on the engine speed by adjusting the flow rate of the cold air fan. The control strategy for the intake air temperature of hydrogen includes: an intake pipeline (P1), connected in series with an air filter (1), a first air flow meter (2), a throttle valve (3), and an intake air pressure sensor (4); the liquid hydrogen pipeline (P2), on which the liquid hydrogen tank (13), the first temperature sensor (12), the heat exchanger (11), the second temperature sensor (10), and the liquid hydrogen flow meter are connected in series (9), pressure reducing valve (8), pressure regulating valve (7), flame arrester (6), hydrogen nozzle (5); cooling pipeline (P3), on which the second air flow meter (14) is connected in series respectively , a third temperature sensor (15), a heat exchanger (11), a fourth temperature sensor (16), and a cooling fan (17).

ECU接受来自转速传感器(18)输出信号A2、液氢流量计(9)输出信号A4、第四温度传感器(16)输出信号A5、第二温度传感器(10)输出信号A6、第三温度传感器(15)输出信号A7、第二空气流量计(14)输出信号A8、第一温度传感器(12)输出信号A9、第一空气流量计(2)输出信号A10；ECU向喷嘴(5)发出信号A1、向冷却风扇(17)发出信号A3。The ECU receives the output signal A2 from the rotational speed sensor (18), the output signal A4 of the liquid hydrogen flow meter (9), the output signal A5 of the fourth temperature sensor (16), the output signal A6 of the second temperature sensor (10), and the output signal of the third temperature sensor ( 15) Output signal A7, second air flow meter (14) output signal A8, first temperature sensor (12) output signal A9, first air flow meter (2) output signal A10; ECU sends signal A1 to nozzle (5) , Send a signal A3 to the cooling fan (17).

氢气喷嘴(5)将氢气喷入进气管路(P1)与空气混合后进入椭圆活塞旋转发动机(19)，经历一个热力学循环后由发动机排气管路(P5a、P5b)排至外界环境。The hydrogen nozzle (5) injects hydrogen into the intake pipeline (P1) and mixes it with air to enter the elliptical piston rotary engine (19). After a thermodynamic cycle, it is discharged to the external environment by the engine exhaust pipeline (P5a, P5b).

换热器(11)将液氢管路(P1)与冷却管路(P3)进行热量交换；冷却管路分为缸体冷却管路(P4a、P4b)和转子冷却管路(P5a、P5b)，管路之间相互串联，进入发动机冷却通道进行冷却。The heat exchanger (11) exchanges heat between the liquid hydrogen pipeline (P1) and the cooling pipeline (P3); the cooling pipeline is divided into cylinder cooling pipelines (P4a, P4b) and rotor cooling pipelines (P5a, P5b) , the pipelines are connected in series with each other and enter the engine cooling channel for cooling.

发动机ECU接受来自转速传感器(18)输出信号A2、液氢流量计(9)输出信号A4、第四温度传感器(16)输出信号A5、第二温度传感器(10)输出信号A6、第三温度传感器(15)输出信号A7、第二空气流量计(14)输出信号A8、第一温度传感器(12)输出信号A9、第一空气流量计(2)输出信号A10。The engine ECU receives the output signal A2 from the speed sensor (18), the output signal A4 from the liquid hydrogen flow meter (9), the output signal A5 from the fourth temperature sensor (16), the output signal A6 from the second temperature sensor (10), and the output signal from the third temperature sensor. (15) Output signal A7, second air flow meter (14) output signal A8, first temperature sensor (12) output signal A9, first air flow meter (2) output signal A10.

ECU接受转速传感器(18)输出信号A2，发动机转速由n＝0rpm变为n≠0rpm时，发动机处于启动阶段，此时采用稀薄燃烧，持续时间为4秒；ECU接受第一空气流量计(2)输出信号A10向氢气喷嘴(5)输入信号A1，使得过量空气系数λ＝1.6，其中λ＝Qair/(QH2×2.38)，其中Qair为空气的体积流量，QH2为氢气的体积流量。ECU accepts the output signal A2 of the speed sensor (18). When the engine speed changes from n=0rpm to n≠0rpm, the engine is in the start-up phase. At this time, lean combustion is adopted and the duration is 4 seconds; the ECU receives the first air flow meter (2 ) output signal A10 to the hydrogen nozzle (5) input signal A1, so that the excess air coefficient λ=1.6, where λ=Q air /(Q H2 × 2.38), where Q air is the volume flow of air, and Q H2 is the volume of hydrogen flow.

ECU接受转速传感器(18)输出信号A2，发动机转速0＜n≤7000rpm时，转子机正常运行，ECU接受第一空气流量计(2)输出信号A10向氢气喷嘴(5)输入信号A1，使得过量空气系数λ＝1。The ECU receives the output signal A2 of the rotational speed sensor (18). When the engine rotational speed is 0<n≤7000rpm, the rotor machine operates normally. The air coefficient λ=1.

当发动机转速0＜n≤3000rpm时，此时发动机处于低速运行；ECU接受液氢流量计(9)输出信号A4、第四温度传感器(16)输出信号A5、第二温度传感器(10)输出信号A6、第三温度传感器(15)输出信号A7、第二空气流量计(14)输出信号A8、第一温度传感器(12)输出信号A9，此时冷却空气通过充满液氢的换热器，温度降低，液氢温度升高；此时向冷却风扇(17)发出信号A3，使第二温度传感器(10)监测温度T2＝-n/300-20(单位为℃)；通过减压阀后，液氢变为氢气进入进气管路与空气混合，低温氢气和其汽化潜热的特性减小了发动机回火等现象的发生。When the engine speed is 0<n≤3000rpm, the engine is running at a low speed; the ECU receives the output signal A4 of the liquid hydrogen flow meter (9), the output signal A5 of the fourth temperature sensor (16), and the output signal of the second temperature sensor (10) A6, the third temperature sensor (15) output signal A7, the second air flow meter (14) output signal A8, the first temperature sensor (12) output signal A9, now the cooling air passes through the heat exchanger full of liquid hydrogen, the temperature Decrease, liquid hydrogen temperature raises; Send signal A3 to cooling fan (17) this moment, make the second temperature sensor (10) monitor temperature T2=-n/300-20 (unit is ℃); After passing through pressure reducing valve, Liquid hydrogen turns into hydrogen and enters the intake pipe to mix with air. The characteristics of low-temperature hydrogen and its latent heat of vaporization reduce the occurrence of engine backfire and other phenomena.

当发动机转速3000＜n≤5000rpm时，此时发动机在中间转速运行，发动机内部化学反应加剧，需要较低温度的氢气；此时ECU接受液氢流量计(9)输出信号A4、第四温度传感器(16)输出信号A5、第二温度传感器(10)输出信号A6、第三温度传感器(15)输出信号A7、第二空气流量计(14)输出信号A8、第一温度传感器(12)输出信号A9，此时向冷却风扇(17)发出信号A3，使第二温度传感器(10)监测温度T2＝(3000-n)/100-30(单位为℃)，达到低温氢气。When the engine speed is 3000<n≤5000rpm, the engine is running at a middle speed, the internal chemical reaction of the engine is intensified, and hydrogen at a lower temperature is required; at this time, the ECU receives the output signal A4 of the liquid hydrogen flowmeter (9) and the fourth temperature sensor (16) output signal A5, the second temperature sensor (10) output signal A6, the third temperature sensor (15) output signal A7, the second air flow meter (14) output signal A8, the first temperature sensor (12) output signal A9, send a signal A3 to the cooling fan (17) at this time, so that the second temperature sensor (10) monitors the temperature T2=(3000-n)/100-30 (unit is ℃), reaching low-temperature hydrogen.

当发动机转速5000＜n≤7000rpm时，发动机处于高速运转，内部化学反应剧烈；ECU接受液氢流量计(9)输出信号A4、第四温度传感器(16)输出信号A5、第二温度传感器(10)输出信号A6、第三温度传感器(15)输出信号A7、第二空气流量计(14)输出信号A8、第一温度传感器(12)输出信号A9，此时向冷却风扇(17)发出信号A3，使第二温度传感器(10)监测温度T2＝3(5000-n)/200-50(单位为℃)。When the engine speed is 5000<n≤7000rpm, the engine is running at high speed, and the internal chemical reaction is violent; the ECU receives the output signal A4 of the liquid hydrogen flow meter (9), the output signal A5 of the fourth temperature sensor (16), and the output signal of the second temperature sensor (10 ) output signal A6, the third temperature sensor (15) output signal A7, the second air flow meter (14) output signal A8, the first temperature sensor (12) output signal A9, send signal A3 to cooling fan (17) at this moment , make the second temperature sensor (10) monitor the temperature T2=3(5000-n)/200-50 (the unit is ℃).

ECU接受转速传感器(18)输出信号A2，转子机转速n＞7000rpm时，此时被认定为超速运行，ECU向氢气喷嘴(5)发入信号A1，停止氢气的供给。ECU receives the output signal A2 of the rotational speed sensor (18), and when the rotational speed of the rotor machine n>7000rpm, it is considered as overspeed operation at this moment, and the ECU sends signal A1 to the hydrogen nozzle (5) to stop the supply of hydrogen.

附图说明Description of drawings

图1为本发明的结构原理图。Fig. 1 is the structure schematic diagram of the present invention.

图1中：空气滤清器(1)、第一空气流量计(2)、节气门(3)、进气压力传感器(4)、氢气喷嘴(5)、阻火器(6)、压力调节阀(7)、减压阀(8)、液氢流量计(9)、第二温度传感器(10)、换热器(11)、第一温度传感器(12)、液氢罐(13)、第二空气流量计(14)，第三温度传感器(15)、第四温度传感器(16)、冷却风扇(17)、转速传感器(18)、椭圆活塞旋转发动机(19)、进气管路(P1)、液氢管路(P2)、冷却管路(P3)、缸体冷却管路(P4a、P4b)、转子冷却管路(P5a、P5b)。此外，ECU向喷嘴(5)发出信号A1、向冷却风扇(17)发出信号A3、ECU接受来自转速传感器(18)输出信号A2、液氢流量计(9)输出信号A4、第四温度传感器(16)输出信号A5、第二温度传感器(10)输出信号A6、第三温度传感器(15)输出信号A7、第二空气流量计(14)输出信号A8、第一温度传感器(12)输出信号A9、第一空气流量计(2)输出信号A10。In Fig. 1: air filter (1), first air flow meter (2), throttle valve (3), intake pressure sensor (4), hydrogen nozzle (5), flame arrester (6), pressure regulating valve (7), pressure reducing valve (8), liquid hydrogen flow meter (9), second temperature sensor (10), heat exchanger (11), first temperature sensor (12), liquid hydrogen tank (13), the first Two air flow meters (14), the third temperature sensor (15), the fourth temperature sensor (16), cooling fan (17), speed sensor (18), elliptical piston rotary engine (19), intake pipeline (P1) , Liquid hydrogen pipeline (P2), cooling pipeline (P3), cylinder block cooling pipeline (P4a, P4b), rotor cooling pipeline (P5a, P5b). In addition, the ECU sends a signal A1 to the nozzle (5), sends a signal A3 to the cooling fan (17), the ECU receives the output signal A2 from the rotational speed sensor (18), the output signal A4 from the liquid hydrogen flowmeter (9), and the fourth temperature sensor ( 16) Output signal A5, second temperature sensor (10) output signal A6, third temperature sensor (15) output signal A7, second air flow meter (14) output signal A8, first temperature sensor (12) output signal A9 , The first air flow meter (2) outputs a signal A10.

图2为椭圆活塞旋转发动机缸体、转子结构示意图。Fig. 2 is a structural schematic diagram of an elliptical piston rotary engine block and a rotor.

图2中：缸体(20)、转子(21)、偏心轴(22)、转子内部进气通道(23)、转子内部排气口(24)。Among Fig. 2: cylinder block (20), rotor (21), eccentric shaft (22), rotor internal air intake channel (23), rotor internal exhaust port (24).

具体实施方式Detailed ways

下面结合附图进一步说明本发明具体实施方式：Further illustrate the specific embodiment of the present invention below in conjunction with accompanying drawing:

包括：进气管路(P1)，其上串联分别为空气滤清器(1)、第一空气流量计(2)、节气门(3)、进气压力传感器(4)；液氢管路(P2)，其上串联分别液氢罐(13)、第一温度传感器(12)、换热器(11)、第二温度传感器(10)、液氢流量计(9)、减压阀(8)、压力调节阀(7)、阻火器(6)、氢气喷嘴(5)；冷却管路(P3)，其上串联分别为第二空气流量计(14)，第三温度传感器(15)、换热器(11)、第四温度传感器(16)、冷却风扇(17)。Including: intake pipeline (P1), connected in series with air filter (1), first air flow meter (2), throttle valve (3), intake pressure sensor (4); liquid hydrogen pipeline ( P2), on which the liquid hydrogen tank (13), the first temperature sensor (12), the heat exchanger (11), the second temperature sensor (10), the liquid hydrogen flowmeter (9), and the pressure reducing valve (8) are connected in series. ), a pressure regulating valve (7), a flame arrester (6), a hydrogen nozzle (5); a cooling pipeline (P3), on which the second air flow meter (14) is connected in series, the third temperature sensor (15), Heat exchanger (11), fourth temperature sensor (16), cooling fan (17).

ECU接受来自转速传感器(18)输出信号A2、液氢流量计(9)输出信号A4、第四温度传感器(16)输出信号A5、第二温度传感器(10)输出信号A6、第三温度传感器(15)输出信号A7、第二空气流量计(14)输出信号A8、第一温度传感器(12)输出信号A9、第一空气流量计(2)输出信号A10；ECU向喷嘴(5)发出信号A1、向冷却风扇(17)发出信号A3。The ECU receives the output signal A2 from the rotational speed sensor (18), the output signal A4 of the liquid hydrogen flow meter (9), the output signal A5 of the fourth temperature sensor (16), the output signal A6 of the second temperature sensor (10), and the output signal of the third temperature sensor ( 15) Output signal A7, second air flow meter (14) output signal A8, first temperature sensor (12) output signal A9, first air flow meter (2) output signal A10; ECU sends signal A1 to nozzle (5) , Send a signal A3 to the cooling fan (17).

氢气喷嘴(5)将氢气喷入进气管路(P1)与空气混合后进入椭圆活塞旋转发动机(19)，经历一个热力学循环后由发动机排气管路(P5a、P5b)排至外界环境。The hydrogen nozzle (5) injects hydrogen into the intake pipeline (P1) and mixes it with air to enter the elliptical piston rotary engine (19). After a thermodynamic cycle, it is discharged to the external environment by the engine exhaust pipeline (P5a, P5b).

换热器(11)将液氢管路(P1)与冷却管路(P3)进行热量交换；冷却管路分为缸体冷却管路(P4a、P4b)和转子冷却管路(P5a、P5b)，管路之间相互串联，进入发动机冷却通道进行冷却。The heat exchanger (11) exchanges heat between the liquid hydrogen pipeline (P1) and the cooling pipeline (P3); the cooling pipeline is divided into cylinder cooling pipelines (P4a, P4b) and rotor cooling pipelines (P5a, P5b) , the pipelines are connected in series with each other and enter the engine cooling channel for cooling.

发动机ECU接受来自转速传感器(18)输出信号A2、液氢流量计(9)输出信号A4、第四温度传感器(16)输出信号A5、第二温度传感器(10)输出信号A6、第三温度传感器(15)输出信号A7、第二空气流量计(14)输出信号A8、第一温度传感器(12)输出信号A9、第一空气流量计(2)输出信号A10。The engine ECU receives the output signal A2 from the speed sensor (18), the output signal A4 from the liquid hydrogen flow meter (9), the output signal A5 from the fourth temperature sensor (16), the output signal A6 from the second temperature sensor (10), and the output signal from the third temperature sensor. (15) Output signal A7, second air flow meter (14) output signal A8, first temperature sensor (12) output signal A9, first air flow meter (2) output signal A10.

ECU接受转速传感器(18)输出信号A2，发动机转速由n＝0rpm变为n≠0rpm时，发动机处于启动阶段，此时采用稀薄燃烧，持续时间为4秒；ECU接受第一空气流量计(2)输出信号A10向氢气喷嘴(5)输入信号A1，使得过量空气系数λ＝1.6，其中λ＝Qair/(QH2×2.38)，其中Qair为空气的体积流量，QH2为氢气的体积流量。ECU accepts the output signal A2 of the speed sensor (18). When the engine speed changes from n=0rpm to n≠0rpm, the engine is in the start-up phase. At this time, lean combustion is adopted and the duration is 4 seconds; the ECU receives the first air flow meter (2 ) output signal A10 to the hydrogen nozzle (5) input signal A1, so that the excess air coefficient λ=1.6, where λ=Q air /(Q H2 × 2.38), where Q air is the volume flow of air, and Q H2 is the volume of hydrogen flow.

ECU接受转速传感器(18)输出信号A2，发动机转速0＜n≤7000rpm时，转子机正常运行，ECU接受第一空气流量计(2)输出信号A10向氢气喷嘴(5)输入信号A1，使得过量空气系数λ＝1。The ECU receives the output signal A2 of the rotational speed sensor (18). When the engine rotational speed is 0<n≤7000rpm, the rotor machine operates normally. The air coefficient λ=1.

当发动机转速0＜n≤3000rpm时，此时发动机处于低速运行；ECU接受液氢流量计(9)输出信号A4、第四温度传感器(16)输出信号A5、第二温度传感器(10)输出信号A6、第三温度传感器(15)输出信号A7、第二空气流量计(14)输出信号A8、第一温度传感器(12)输出信号A9，此时冷却空气通过充满液氢的换热器，温度降低，液氢温度升高；此时向冷却风扇(17)发出信号A3，使第二温度传感器(10)监测温度T2＝-n/300-20(单位为℃)；通过减压阀后，液氢变为氢气进入进气管路与空气混合，低温氢气和其汽化潜热的特性减小了发动机回火等现象的发生。When the engine speed is 0<n≤3000rpm, the engine is running at a low speed; the ECU receives the output signal A4 of the liquid hydrogen flow meter (9), the output signal A5 of the fourth temperature sensor (16), and the output signal of the second temperature sensor (10) A6, the third temperature sensor (15) output signal A7, the second air flow meter (14) output signal A8, the first temperature sensor (12) output signal A9, now the cooling air passes through the heat exchanger full of liquid hydrogen, the temperature Decrease, liquid hydrogen temperature raises; Send signal A3 to cooling fan (17) this moment, make the second temperature sensor (10) monitor temperature T2=-n/300-20 (unit is ℃); After passing through pressure reducing valve, Liquid hydrogen turns into hydrogen and enters the intake pipe to mix with air. The characteristics of low-temperature hydrogen and its latent heat of vaporization reduce the occurrence of engine backfire and other phenomena.

当发动机转速3000＜n≤5000rpm时，此时发动机在中间转速运行，发动机内部化学反应加剧，需要较低温度的氢气；此时ECU接受液氢流量计(9)输出信号A4、第四温度传感器(16)输出信号A5、第二温度传感器(10)输出信号A6、第三温度传感器(15)输出信号A7、第二空气流量计(14)输出信号A8、第一温度传感器(12)输出信号A9，此时向冷却风扇(17)发出信号A3，使第二温度传感器(10)监测温度T2＝(3000-n)/100-30(单位为℃)，达到低温氢气。When the engine speed is 3000<n≤5000rpm, the engine is running at a middle speed, the internal chemical reaction of the engine is intensified, and hydrogen at a lower temperature is required; at this time, the ECU receives the output signal A4 of the liquid hydrogen flowmeter (9) and the fourth temperature sensor (16) output signal A5, the second temperature sensor (10) output signal A6, the third temperature sensor (15) output signal A7, the second air flow meter (14) output signal A8, the first temperature sensor (12) output signal A9, send a signal A3 to the cooling fan (17) at this time, so that the second temperature sensor (10) monitors the temperature T2=(3000-n)/100-30 (unit is ℃), reaching low-temperature hydrogen.

当发动机转速5000＜n≤7000rpm时，发动机处于高速运转，内部化学反应剧烈；ECU接受液氢流量计(9)输出信号A4、第四温度传感器(16)输出信号A5、第二温度传感器(10)输出信号A6、第三温度传感器(15)输出信号A7、第二空气流量计(14)输出信号A8、第一温度传感器(12)输出信号A9，此时向冷却风扇(17)发出信号A3，使第二温度传感器(10)监测温度T2＝3(5000-n)/200-50(单位为℃)。When the engine speed is 5000<n≤7000rpm, the engine is running at high speed, and the internal chemical reaction is violent; the ECU receives the output signal A4 of the liquid hydrogen flow meter (9), the output signal A5 of the fourth temperature sensor (16), and the output signal of the second temperature sensor (10 ) output signal A6, the third temperature sensor (15) output signal A7, the second air flow meter (14) output signal A8, the first temperature sensor (12) output signal A9, send signal A3 to cooling fan (17) at this moment , make the second temperature sensor (10) monitor the temperature T2=3(5000-n)/200-50 (the unit is ℃).

ECU接受转速传感器(18)输出信号A2，转子机转速n＞7000rpm时，此时被认定为超速运行，ECU向氢气喷嘴(5)发入信号A1，停止氢气的供给。ECU receives the output signal A2 of the rotational speed sensor (18), and when the rotational speed of the rotor machine n>7000rpm, it is considered as overspeed operation at this moment, and the ECU sends signal A1 to the hydrogen nozzle (5) to stop the supply of hydrogen.

Claims (2)

1. An elliptical piston rotary engine based on liquid hydrogen fuel, comprising: an air inlet pipeline (P1) is connected in series with an air filter (1), a first air flowmeter (2), a throttle valve (3) and an air inlet pressure sensor (4) respectively; the liquid hydrogen pipeline (P2) is connected in series with a liquid hydrogen tank (13), a first temperature sensor (12), a heat exchanger (11), a second temperature sensor (10), a liquid hydrogen flowmeter (9), a pressure reducing valve (8), a pressure regulating valve (7), a flame arrester (6) and a hydrogen nozzle (5), wherein the hydrogen nozzle (5) sprays hydrogen into an air inlet pipeline (P1) to be mixed with air, then enters an elliptic piston rotary engine (19), and is discharged to the external environment through an engine exhaust pipeline after undergoing a thermodynamic cycle; the cooling pipeline (P3) is connected in series with a second air flow meter (14), a third temperature sensor (15), a heat exchanger (11), a fourth temperature sensor (16) and a cooling fan (17) respectively; the heat exchanger (11) exchanges heat between the liquid hydrogen pipeline (P1) and the cooling pipeline (P3); the cooling pipeline is divided into a cylinder cooling pipeline and a rotor cooling pipeline, the pipelines are connected in series, and the cylinder cooling pipeline and the rotor cooling pipeline enter an engine cooling channel for cooling; the ECU receives an output signal A2 from a rotating speed sensor (18), an output signal A4 of a liquid hydrogen flowmeter (9), an output signal A5 of a fourth temperature sensor (16), an output signal A6 of a second temperature sensor (10), an output signal A7 of a third temperature sensor (15), an output signal A8 of a second air flowmeter (14), an output signal A9 of a first temperature sensor (12) and an output signal A10 of a first air flowmeter (2); the ECU sends a signal A1 to the nozzle (5) and a signal A3 to the cooling fan (17).
2. A method of controlling an elliptical piston rotary engine as recited in claim 1, wherein:
the engine ECU receives an output signal A2 from a rotating speed sensor (18), an output signal A4 of a liquid hydrogen flowmeter (9), an output signal A5 of a fourth temperature sensor (16), an output signal A6 of a second temperature sensor (10), an output signal A7 of a third temperature sensor (15), an output signal A8 of a second air flowmeter (14), an output signal A9 of a first temperature sensor (12) and an output signal A10 of a first air flowmeter (2);
the ECU receives the output signal A2 of the rotation speed sensor (18), when the rotation speed of the engine is changed from n=0 rpm to n noteq 0rpm, the engine is in a starting stage, and lean combustion is adopted at the moment, and the duration is 4 seconds; the ECU receives the output signal A10 of the first air flow meter (2) and inputs the signal A1 to the hydrogen nozzle (5) so that the excess air coefficient lambda=1.6, wherein lambda=Q air /(Q H2 X 2.38), where Q air For the volume flow of air, Q H2 Is the volume flow of hydrogen;
the ECU receives an output signal A2 of a rotation speed sensor (18), when the engine rotation speed is more than 0 and less than or equal to 7000rpm, the rotor machine normally operates, and receives an output signal A10 of a first air flow meter (2) to input a signal A1 to a hydrogen nozzle (5) so that the excess air coefficient lambda=1; wherein:
(1) When the engine speed n is more than 0 and less than or equal to 3000rpm, the ECU receives an output signal A4 of the liquid hydrogen flowmeter (9), an output signal A5 of the fourth temperature sensor (16), an output signal A6 of the second temperature sensor (10), an output signal A7 of the third temperature sensor (15), an output signal A8 of the second air flowmeter (14) and an output signal A9 of the first temperature sensor (12), and at the moment, a signal A3 is sent to the cooling fan (17) to enable the second temperature sensor (10) to monitor the temperature T2= -n/300-20 in the unit of DEG C;
(2) When the engine speed is 3000 < n and less than or equal to 5000rpm, the ECU receives an output signal A4 of a liquid hydrogen flowmeter (9), an output signal A5 of a fourth temperature sensor (16), an output signal A6 of a second temperature sensor (10), an output signal A7 of a third temperature sensor (15), an output signal A8 of a second air flowmeter (14) and an output signal A9 of a first temperature sensor (12), and at the moment, a signal A3 is sent to a cooling fan (17) to enable the second temperature sensor (10) to monitor the temperature T2= (3000-n)/100-30 in the unit of DEG C;
(3) When the rotation speed of the engine is 5000 < n and is less than or equal to 7000rpm, the ECU receives an output signal A4 of the liquid hydrogen flowmeter (9), an output signal A5 of the fourth temperature sensor (16), an output signal A6 of the second temperature sensor (10), an output signal A7 of the third temperature sensor (15), an output signal A8 of the second air flowmeter (14) and an output signal A9 of the first temperature sensor (12), and at the moment, a signal A3 is sent to the cooling fan (17) to enable the second temperature sensor (10) to monitor the temperature T2 = 3 (5000-n)/200-50, wherein the unit is the temperature;
when the ECU receives the output signal A2 from the rotation speed sensor (18) and the rotation speed n of the rotor machine is more than 7000rpm, the ECU is judged to be in overspeed operation, and sends a signal A1 to the hydrogen nozzle (5) to stop the supply of hydrogen.
CN202310307595.4A 2023-03-28 2023-03-28 Elliptic piston rotary engine based on liquid hydrogen fuel and control method thereof Pending CN116447005A (en)

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KR20190130934A (en) * 2018-05-15 2019-11-25 엘지전자 주식회사 Rotary engine having enhanced sealing structure
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