阅读说明：本技术 一种无节气门转子发动机控制方法 (Control method for rotary engine without throttle valve ) 是由 纪常伟 常珂 汪硕峰 杨金鑫 辛固 史梦圆 杨振宇 于 2021-07-25 设计创作，主要内容包括：本发明设计了一种无节气门转子发动机控制方法,具体内容涉及转子发动机无节气门控制技术及氢气、汽油双燃料燃烧控制方法。本发明取消了转子发动机节气门装置,通过输出扭矩和平均指示压力循环变动系数合理调控转子发动机氢气和汽油双燃料喷射策略,保证转子发动机在无节气门状态下稳定运行。本发明在消除节气门节流损失、提高充量系数的同时利用氢气燃料喷射技术实现了转子发动机高效、清洁运行。(The invention designs a control method of a rotary engine without a throttle valve, and particularly relates to a rotary engine control technology without a throttle valve and a hydrogen and gasoline dual-fuel combustion control method. The invention cancels a throttle valve device of the rotary engine, reasonably regulates and controls the hydrogen and gasoline dual-fuel injection strategy of the rotary engine through the output torque and the average indication pressure cyclic variation coefficient, and ensures the stable operation of the rotary engine under the state without the throttle valve. The invention realizes the high-efficiency and clean operation of the rotary engine by utilizing the hydrogen fuel injection technology while eliminating throttle throttling loss and improving the charge coefficient.)

1. A control method of a rotary engine without a throttle valve is characterized in that the device used by the method specifically comprises the following steps: an intake line (P1) having thereon, in sequence: an air filter (1) and an air flow meter (2); a gasoline injection branch (P2) having thereon, in succession: the gasoline injection device comprises a gasoline nozzle (3), a gasoline flow controller (4), an oil pump (5), a gasoline filter (6) and a gasoline tank (7), wherein gasoline is mixed with air in an air inlet channel after being injected to form mixed gas; a hydrogen injection line (P3) having thereon, in sequence: the device comprises a hydrogen nozzle (8), a flame-retardant valve (9), a hydrogen flow controller (10), a hydrogen pressure reducing valve (11) and a hydrogen storage tank (12), wherein hydrogen is directly injected in a cylinder and is directly mixed with gasoline mixed gas in a combustion chamber; a spark plug (13), a cylinder pressure sensor (14), an eccentric shaft (15) and an electronic control unit ECU (16);

the electronic control unit ECU (16) is connected with the gasoline flow controller (4) and controls the gasoline fuel supply amount through a gasoline flow signal a;

the electronic control unit ECU (16) is connected with the air flow meter (2) and receives an air inlet flow signal b;

the electronic control unit ECU (16) is connected with the gasoline nozzle (3) and controls gasoline injection through a gasoline injection signal c;

the electronic control unit ECU (16) is connected with the cylinder pressure sensor (14) and receives a cylinder pressure signal d;

the electronic control unit ECU (16) is connected with the spark plug (13) and controls the ignition timing of the spark plug through a spark plug ignition signal e;

the electronic control unit ECU (16) is connected with the hydrogen flow controller (10) and controls the hydrogen fuel supply quantity through a hydrogen flow signal f;

the electronic control unit ECU (16) is connected with the hydrogen nozzle (8) and controls the hydrogen injection through a hydrogen injection signal g;

the electronic control unit ECU (16) is connected with the eccentric shaft (15) and obtains an output torque signal h through a torque measuring device.

2. The control method of a rotary engine without throttle according to claim 1, characterized in that:

when the rotating speed n of the rotary engine is changed from n ≠ 0 to n ≠ 0, the starting stage is performed, air sequentially passes through an air filter (1) and an air flow meter (2) in an air inlet channel, an Electronic Control Unit (ECU) (16) receives an air inlet flow signal b, and fuel injection quantity is calculated according to air inlet quantity and an equivalence ratio required in the starting process; an electronic control unit ECU (16) sends a gasoline flow signal a to supply gasoline fuel to a gasoline nozzle (3) through a gasoline tank (7), a gasoline filter (6), an oil pump (5) and a gasoline flow controller (4) and sends a gasoline injection signal c to control gasoline to be injected to an air inlet channel; gasoline and air form a mixed gas in the air inlet channel, the mixed gas enters a combustion chamber along with the rotation of the rotor to the opening moment of the air inlet valve, and a spark plug (13) jumps to ignite the mixed gas at the end of a compression stroke, so that the starting of the rotary engine without the throttle valve is realized;

after the rotor engine is started, the electronic control unit ECU (16) receives an output torque signal h through a torque measuring device connected with the eccentric shaft (15) and calculates an actual torque value, and meanwhile, the electronic control unit ECU (16) obtains a corresponding target torque in real time according to original machine calibration data; when the actual torque is higher than the target torque, the electronic control unit ECU (16) reduces the fuel injection quantity of the gasoline injection nozzle (3) through a gasoline injection signal c, so that the actual output torque of the rotary engine is reduced until the actual torque is the same as the target torque; when the actual torque is equal to the target torque, the electronic control unit ECU (16) controls the fuel injection quantity of the gasoline nozzle (3) to be kept unchanged through a gasoline injection signal c; when the actual torque is lower than the target torque, the electronic control unit ECU (16) increases the fuel injection quantity of the gasoline injection nozzle (3) through a gasoline injection signal c, so that the actual output torque of the rotary engine is increased until the actual torque is the same as the target torque;

in the process of regulating and controlling the oil injection quantity of the gasoline nozzle (3), an Electronic Control Unit (ECU) (16) calculates the cyclic variation coefficient CoVimep of average indicated effective pressure according to a cylinder pressure signal d output by a cylinder pressure sensor (14),

in the formula (1), i is the number of cycles, i is more than or equal to 100, and P_iThe effective pressure is indicated for the average of the i-th cycle,indicating the mean of the effective pressures for the average of i cycles;

the method comprises the following steps that an electronic control unit ECU (16) calculates a cyclic variation coefficient CoVimep of average indicated effective pressure in a cylinder through a formula (1), when the CoVimep is larger than 5%, the electronic control unit ECU (16) sends a hydrogen injection signal g, and hydrogen fuel is injected into the cylinder through a hydrogen storage tank (12), a hydrogen pressure reducing valve (11), a hydrogen flow controller (10), a flame-retardant valve (9) and a hydrogen nozzle (8) in sequence by utilizing the characteristic that the blended hydrogen fuel improves combustion stability until the CoVimep is smaller than or equal to 5%; when CoVimep is less than or equal to 5%, the electronic control unit ECU (16) stops sending the hydrogen injection signal g, and the operation of the rotary engine without the throttle valve is controlled only by the gasoline injection quantity.

Technical Field

The invention designs a control method of a rotary engine without a throttle valve, in particular relates to a rotary engine control technology without a throttle valve and a hydrogen and gasoline dual-fuel combustion control method, and belongs to the field of internal combustion engines.

Background

The rotor engine has wide application prospect in the fields of automobiles, small unmanned aerial vehicles and the like as an internal combustion engine with a special structural form. Compared with the internal combustion engine, the rotary engine cancels a crank connecting rod mechanism, replaces the reciprocating motion of a crank connecting rod by the rotary motion of the triangular rotor, and does not generate reciprocating inertia force. The rotary engine has the advantages of small volume, light weight, good high-speed performance, stable operation, low noise and the like, but the rotary engine has the problems of low charging efficiency, high emission content and the like due to a long and narrow combustion chamber structure and a special air intake and exhaust mechanism.

Since rotary engines do not have an intake valve mechanism, the presence of a throttle device is an important factor affecting the coefficient of charge. The elimination of the throttle device can directly and effectively eliminate the throttling loss at the throttle, and improve the charging coefficient of the rotary engine. The hydrogen fuel has good physical and chemical properties, the lean burn limit is about 5 to 10 times of that of the traditional fossil fuel, and the lower ignition energy of the hydrogen is very suitable for quickly regulating and controlling the cyclic variation coefficient of the average indicated effective pressure in the cylinder. The elimination of the throttle valve device and the use of the blended hydrogen fuel can not only eliminate the throttling loss and improve the air intake charge coefficient of the rotary engine, but also maintain the stable operation of the rotary engine and reduce the emission of carbon-based pollutants.

Based on the characteristics of the control of the rotary engine without the throttle valve and the combustion of the mixed hydrogen, the invention provides the control method of the rotary engine without the throttle valve, fills the blank of the dual-fuel control of the conventional rotary engine without the throttle valve, and realizes the high-efficiency and clean operation of the rotary engine.

The indicated average effective pressure is a general identification performance parameter of the engine and can be obtained by real-time measurement and calculation of the electronic control unit.

Disclosure of Invention

Aiming at the problem of low charging efficiency of the rotary engine, the invention provides a control method of the rotary engine without the throttle valve. The invention makes the rotor engine always in the full flow air intake state in the running process by canceling the throttle valve device, keeps the actual output torque consistent with the target torque by adjusting the gasoline fuel injection quantity, and controls the cyclic variation coefficient of the average indicated effective pressure in the cylinder by the hydrogen injection strategy, so that the rotor engine stably runs under the condition of no throttle.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method of controlling a rotary engine without throttle, comprising: an intake line P1 having thereon, in sequence: air cleaner 1, air flowmeter 2, petrol spray branch road P2, have in proper order on it: the device comprises a gasoline nozzle 3, a gasoline flow controller 4, an oil pump 5, a gasoline filter 6 and a gasoline tank 7, wherein gasoline is mixed with air in an air inlet channel after being sprayed to form mixed gas which enters a combustion chamber; a hydrogen injection line P3 on which are successively provided: the device comprises a hydrogen nozzle 8, a flame-retardant valve 9, a hydrogen flow controller 10, a hydrogen pressure reducing valve 11 and a hydrogen storage tank 12, wherein hydrogen is directly injected in a cylinder and is directly mixed with gasoline mixed gas in a combustion chamber; spark plug 13, cylinder pressure sensor 14, eccentric shaft 15, electronic control unit ECU 16;

the electronic control unit ECU16 is connected with the gasoline flow controller 4 and controls the gasoline fuel supply quantity through a gasoline flow signal a;

the electronic control unit ECU16 is connected to the airflow meter 2 and receives an intake air flow signal b;

the electronic control unit ECU16 is connected with the gasoline nozzle 3 and controls gasoline injection through a gasoline injection signal c;

the electronic control unit ECU16 is connected with the cylinder pressure sensor 14 and receives a cylinder pressure signal d;

the electronic control unit ECU16 is connected with the spark plug 13 and controls the ignition timing of the spark plug through a spark plug ignition signal e;

the ECU16 is connected to the hydrogen flow controller 10 and controls the hydrogen fuel supply amount by the hydrogen flow signal f;

the electronic control unit ECU16 is connected with the hydrogen nozzle 8 and controls the hydrogen injection through a hydrogen injection signal g;

the ECU16 is connected to the eccentric shaft 15 and obtains an output torque signal h through a torque measuring device.

A control method of a rotary engine without a throttle valve includes the following control processes:

when the rotating speed n of the rotary engine is changed from n ≠ 0 to n ≠ 0, the starting stage is that air sequentially passes through an air filter 1 and an air flow meter 2 in an air inlet channel, and an electronic control unit ECU16 receives an air inlet flow signal b and calculates the fuel injection quantity according to the air inlet quantity and the equivalence ratio required by the starting process; the electronic control unit ECU16 sends out a gasoline flow signal a to supply gasoline fuel to the gasoline nozzle 3 through the gasoline tank 7, the gasoline filter 6, the oil pump 5 and the gasoline flow controller 4 and sends out a gasoline injection signal c to control the gasoline to be injected to the air inlet channel; gasoline and air form the gas mixture in the intake duct, along with the rotor rotates to the moment that the intake valve opens, the gas mixture gets into the combustion chamber, spark plug 13 jumps and ignites the gas mixture at the end of the compression stroke, realize the start-up of the rotary engine without throttle.

After the rotary engine is started, the electronic control unit ECU16 receives the output torque signal h through the torque measuring device connected with the eccentric shaft 15 and calculates the actual torque value, and meanwhile, the electronic control unit ECU16 obtains the corresponding target torque in real time according to the original machine calibration data. When the actual torque is higher than the target torque, the electronic control unit ECU16 reduces the fuel injection quantity of the gasoline injector 3 through the gasoline injection signal c, so that the actual output torque of the rotary engine is reduced until the actual torque is the same as the target torque; when the actual torque is equal to the target torque, the electronic control unit ECU16 controls the fuel injection quantity of the gasoline injector 3 to be kept unchanged through the gasoline injection signal c; when the actual torque is lower than the target torque, the electronic control unit ECU16 increases the amount of fuel injected from the gasoline injector 3 by the gasoline injection signal c, thereby increasing the actual output torque of the rotary engine until the actual torque is the same as the target torque.

In the process of regulating and controlling the fuel injection quantity of the gasoline nozzle 3, the electronic control unit ECU16 calculates the cyclic variation coefficient CoVimep of the average indicated effective pressure according to the cylinder pressure signal d output by the cylinder pressure sensor 14,

in the formula (1), i is the number of cycles, i is more than or equal to 100, and P_iThe effective pressure is indicated for the average of the i-th cycle,the mean of the effective pressures is indicated for the average of i cycles.

The ECU16 calculates the cyclical variation coefficient CoVimep of the average indicated effective pressure in the cylinder through a formula (1), when the CoVimep is more than 5%, the ECU16 sends a hydrogen injection signal g, and the hydrogen fuel is sprayed into the cylinder through a hydrogen storage tank 12, a hydrogen pressure reducing valve 11, a hydrogen flow controller 10, a flame retardant valve 9 and a hydrogen nozzle 8 in sequence by utilizing the characteristic that the blended hydrogen fuel improves the combustion stability until the CoVimep is less than or equal to 5%; when the CoVimep is less than or equal to 5%, the electronic control unit ECU16 stops sending the hydrogen injection signal g, and the operation of the rotary engine without throttle is controlled only by the gasoline injection amount.

The beneficial effects of the invention are mainly as follows: a throttle valve device of the rotary engine is cancelled, the throttling loss at the throttle valve is directly eliminated, and the air inlet charge coefficient of the rotary engine is improved. The invention keeps the actual output torque consistent with the target torque by regulating and controlling the gasoline fuel injection amount, and controls the cyclic variation coefficient of the average indicated effective pressure in the cylinder by hydrogen injection, thereby realizing the stable operation of the rotary engine and reducing the emission of carbon-based pollutants.

Drawings

FIG. 1 is a structural working principle diagram of the present invention

In the figure: 1. the fuel gas engine comprises an air filter, 2, an air flow meter, 3, a gasoline nozzle, 4, a gasoline flow controller, 5, an oil pump, 6, a gasoline filter, 7, a gasoline tank, 8, a hydrogen nozzle, 9, a flame-retardant valve, 10, a hydrogen flow controller, 11, a hydrogen pressure reducing valve, 12, a hydrogen storage tank, 13, a spark plug, 14, a cylinder pressure sensor, 15, an eccentric shaft and 16, and an Electronic Control Unit (ECU);

a. gasoline flow signal, b intake flow signal, c gasoline injection signal, d cylinder pressure signal, e spark plug ignition signal, f hydrogen flow signal, g hydrogen injection signal and h output torque signal.

Detailed Description

The invention is further described with reference to the following figures and detailed description:

as shown in fig. 1, when the rotary engine speed n is changed from n ≠ 0 to n ≠ 0, it is a starting stage, the air passes through the air cleaner 1 and the air flow meter 2 in the air inlet channel in sequence, the electronic control unit ECU16 receives the air inlet flow signal b, and calculates the fuel injection quantity according to the air inlet quantity and the equivalence ratio required by the starting process; the electronic control unit ECU16 sends out a gasoline flow signal a to supply gasoline fuel to the gasoline nozzle 3 through the gasoline tank 7, the gasoline filter 6, the oil pump 5 and the gasoline flow controller 4 and sends out a gasoline injection signal c to control the gasoline to be injected to the air inlet channel; gasoline and air form the gas mixture in the intake duct, along with the rotor rotates to the moment that the intake valve opens, the gas mixture gets into the combustion chamber, spark plug 13 jumps and ignites the gas mixture at the end of the compression stroke, realize the start-up of the rotary engine without throttle.

After the rotary engine is started, the electronic control unit ECU16 receives the output torque signal h through the torque measuring device connected with the eccentric shaft 15 and calculates the actual torque value, and meanwhile, the electronic control unit ECU16 obtains the corresponding target torque in real time according to the original machine calibration data. When the actual torque is higher than the target torque, the electronic control unit ECU16 reduces the fuel injection quantity of the gasoline injector 3 through the gasoline injection signal c, so that the actual output torque of the rotary engine is reduced until the actual torque is the same as the target torque; when the actual torque is equal to the target torque, the electronic control unit ECU16 controls the fuel injection quantity of the gasoline injector 3 to be kept unchanged through the gasoline injection signal c; when the actual torque is lower than the target torque, the electronic control unit ECU16 increases the amount of fuel injected from the gasoline injector 3 by the gasoline injection signal c, thereby increasing the actual output torque of the rotary engine until the actual torque is the same as the target torque.

In the process of regulating and controlling the fuel injection quantity of the gasoline nozzle 3, the electronic control unit ECU16 calculates the cyclic variation coefficient CoVimep of the average indicated effective pressure according to the cylinder pressure signal d output by the cylinder pressure sensor 14,

in the formula (1), i is the number of cycles,i≥100，P_ithe effective pressure is indicated for the average of the i-th cycle,the mean of the effective pressures is indicated for the average of i cycles.

The ECU16 calculates the cyclical variation coefficient CoVimep of the average indicated effective pressure in the cylinder through a formula (1), when the CoVimep is more than 5%, the ECU16 sends a hydrogen injection signal g, and the hydrogen fuel is sprayed into the cylinder through a hydrogen storage tank 12, a hydrogen pressure reducing valve 11, a hydrogen flow controller 10, a flame retardant valve 9 and a hydrogen nozzle 8 in sequence by utilizing the characteristic that the blended hydrogen fuel improves the combustion stability until the CoVimep is less than or equal to 5%; when CoVimep is less than or equal to 5%, the electronic control unit ECU (16) stops sending the hydrogen injection signal g, and the operation of the rotary engine without the throttle valve is controlled only by the gasoline injection quantity.