Self-adaptive multi-fuel integrated ignition frequency conversion control method and system

Abstract

The invention discloses a self-adaptive multi-fuel integrated ignition frequency conversion control system, relates to the technical field of general gasoline engine ignition control, and solves the problem of effective ignition period recognition by improving an existing general gasoline engine, so that fuel is fully combusted by adjusting the air inlet amount, and the emission amount is reduced. The internal combustion engine comprises a crankshaft, a flywheel is fixedly arranged on the crankshaft, a trigger is arranged on the outer side of the outer diameter of the flywheel, and the trigger corresponds to the outer contour of a cam. A first contact, a trigger contact and a second contact are arranged on the outer contour of the flywheel at intervals, and the outer diameter arc length of the first contact and the trigger contact is equal to the outer diameter arc length of the flywheel corresponding to the trigger contact and the second contact; the device further comprises a control module and an adjusting valve, the adjusting valve is used for controlling the fuel inlet amount of the internal combustion engine, and the trigger is electrically connected with the control module and used for recording the contact time and time intervals of all the contacts and the trigger. The control module controls the opening angle of the regulating valve according to the time interval.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engine ignition control, and particularly relates to a self-adaptive multi-fuel integrated ignition frequency conversion control system. BACKGROUND

[0002] In a fuel generator, which is a device converting chemical energy, internal energy, mechanical energy and electrical energy, currently, existing domestic multi-fuel frequency conversion generators generally adopt mechanical closed door control of fuel in and out, that is, a mechanical valve is opened during the suction stroke and is closed during the working stroke. However, the above structure has the following defects: complex structure and high cost, the mechanical valve system needs to be precisely machined and assembled, thereby increasing the manufacturing cost; and low combustion efficiency.

[0003] During the valve opening and closing overlap period (about 14% to 10% of the cycle), the unburned fuel is directly discharged into the muffler, resulting in a fuel waste rate of 8% to 11%; the emission pollution is serious: the incomplete combustion makes the CO and hydrocarbon emissions exceed the standard, which does not meet the environmental protection standard; and there is a lack of dynamic adjustment: the fixed mechanical structure cannot optimize the air-fuel ratio in real time according to the working conditions (such as temperature and load). Although individual electronic control schemes attempt to improve, they have not solved the problems of effective ignition identification and multi-parameter collaborative compensation, resulting in high energy consumption and emission. SUMMARY

[0004] I. Technical problems solved The present application proposes a self-adaptive multi-fuel integrated ignition frequency conversion control system to solve the problem of effective ignition cycle identification by improving the existing engine, and further adjusts the air intake to make the fuel fully burn and reduce the emission.

[0005] II. Specific technical solutions A self-adaptive multi-fuel integrated ignition frequency conversion control system is applied to the control of an internal combustion engine of a generator, the internal combustion engine comprising a crankshaft, a flywheel being fixedly arranged on the crankshaft, a trigger being arranged outside the outer diameter of the flywheel, the trigger corresponding to the outer contour of the cam, and a first contact point, a trigger contact point and a second contact point being arranged at intervals on the outer contour of the flywheel, wherein the flywheel outer diameter arc length corresponding to the first contact point and the trigger contact point is equal to the flywheel outer diameter arc length corresponding to the trigger contact point and the second contact point. The system further comprises a control module and an adjusting valve electrically connected to the control module, the adjusting valve being used to control the fuel intake of the internal combustion engine, the trigger being electrically connected to the control module, and the trigger being used to record the contact time and time interval of each contact point and the trigger; and the control module controls the opening angle of the adjusting valve according to the time interval.

[0006] Implementation principle and working principle: The difference between the scheme and the prior art includes the flywheel structure and the valve for fuel entering; when the flywheel rotates, the trigger outside the flywheel triggers the first contact, the trigger contact and the second contact in turn, and the interval time of the first contact and the trigger contact and the interval time of the trigger contact and the second contact can determine whether the internal combustion engine is in the optimal ignition interval, so that the fuel can be ignited in time, and the situation that part of the fuel is discharged without being fully burned is avoided; the opening angle of the adjusting valve can also be controlled by the setting program, so as to control the amount of fuel entering, improve the combustion efficiency, and also reduce the problem of fuel leakage of the mechanical valve; the adjusting valve replaces the existing gate valve, which can adjust the amount of different fuels entering the cylinder and meet the application of different fuels.

[0007] As preferred, the arc length corresponding to the first contact and the second contact is arc length A; the arc length corresponding to the second contact and the third contact is arc length B; the arc length of the first contact and the third contact on the side opposite to the second contact is arc length C, wherein arc length A is equal to arc length B, and both are smaller than arc length C; the beneficial effect of the present preferred embodiment is that the trigger misjudgment rate can be effectively reduced by setting the distance between the contacts.

[0008] As preferred, a rotation speed sensing module is further arranged on the crankshaft of the internal combustion engine, the rotation speed sensing module is electrically connected with the control module, and the control module controls the opening angle of the adjusting valve according to the rotation data; the beneficial effect of the present preferred embodiment is that the cooperation of the rotation speed sensor and the opening angle setting can be beneficial to avoiding the imbalance of fuel ratio at high rotation speed.

[0009] As preferred, a temperature detection module is further arranged on the shell of the internal combustion engine, the temperature detection module is electrically connected with the control module, and the control module controls the opening angle of the adjusting valve according to the temperature data; the beneficial effect of the present preferred embodiment is that the control module can reduce the ignition delay caused by excessively high temperature through the temperature data.

[0010] As preferred, a pressure sensing module is further arranged on the intake pipe of the internal combustion engine, the pressure sensing module is electrically connected with the control module, and the control module controls the opening angle of the adjusting valve according to the intake pressure; the beneficial effect of the present preferred embodiment is that the control module can reduce the insufficient combustion caused by the fluctuation of intake pressure by controlling the opening degree of the adjusting valve through the data of the pressure sensing module.

[0011] As preferred, an output power collecting module is further included; the output power collecting module is electrically connected with the control module, and the control module adjusts the opening angle of the adjusting valve according to the output power; the beneficial effect of the present preferred embodiment is that the control module can avoid the unstable output caused by sudden load increase by controlling the adjusting valve through the data of the output power collecting module.

[0012] The adaptive multi-fuel integrated ignition variable frequency control method is applied to the adaptive multi-fuel integrated ignition variable frequency control system, and comprises the following steps: S1, identifying an effective ignition trigger point through a non-uniformly divided symmetrical flywheel, a first contact point, a trigger contact point and a second contact point on the flywheel; S2, identifying an effective ignition cycle based on a trigger and a flywheel rotation timing: acquiring an interval time T1 from the first contact point to the trigger contact point when the flywheel rotates clockwise, and an interval time T2 between the trigger contact point and the second contact point, if T1 < T2, it is determined that it is an effective ignition cycle, at this time, it is a compression rotation power stroke, if T1 > T2, it is determined that it is an ineffective ignition cycle, at this time, it is an exhaust rotation and air intake stroke; S3, collecting engine state parameters in real time: including fuel type, which can be specifically identified through a switching switch, output power, cylinder head temperature, intake pressure and rotation speed; S4, adaptive fuel control: presetting a matching program of state parameters and adjusting valve opening degrees of different fuels in a control module, and the control module matches corresponding adjusting valve opening angles and time lengths according to the fuel type and real-time state parameters.

[0013] In the method, the controller can solve the entering amount of different fuels by controlling the opening degree of the adjusting valve, and adapt to the combustion demand of different fuels; in steps S1 and S2, the effective ignition cycle can be better identified by comparing the time difference of triggering of each contact point and the trigger, fuel is ignited in the effective ignition cycle, and the direct discharge amount of fuel or unignited fuel caused by the coincidence of the ignition cycle and the non-ignition cycle of the traditional mechanical valve can be avoided; in steps S3 and S4, the fuel entering amount and the opening degree setting of the adjusting valve at different fuels can improve the compatibility of the internal combustion engine to fuels, and the optimal working condition of the internal combustion engine at different fuels can also be achieved, the waste rate and the emission rate are greatly reduced, and the stability is greatly improved.

[0014] Preferably, in step S3, when it is identified that the rotation speed is increased, the opening angle of the electromagnetic valve is reduced by negative compensation; when it is identified that the temperature of the internal combustion engine is increased, the action delay of the electromagnetic valve is shortened by negative compensation; when it is identified that the load power is increased, the opening angle of the electromagnetic valve is increased by positive compensation; and when it is identified that the intake pressure is increased, the angle increase amount is reduced by negative compensation.

[0015] The beneficial effects of the present application are: 1, in the scheme, the flywheel is improved, that is, the first contact point, the trigger contact point and the second contact point are arranged on the flywheel, wherein each contact point is protruding and cooperates with the trigger, and the distance between each contact point is set, so that the controller can identify the effective ignition interval for ignition, avoid direct discharge of unburned fuel, and be more in line with emission standards.

[0016] 2. The controller combines the five parameters of fuel type, power, temperature, pressure, and speed, and establishes a segmented compensation function to adjust the opening of the regulating valve, making the internal combustion engine compatible with different fuels; it can also reduce fuel waste and improve the reliability and stability of internal combustion engine combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Fig. 1 Schematic diagram of the layout of the minute wheel and trigger according to an embodiment of the present invention.

[0018] Fig. 2 This is a connection diagram of an adaptive multi-fuel integrated ignition frequency conversion control system according to an embodiment of the present invention.

[0019] Description of reference numerals: Flywheel 1, trigger 2, first contact 3, trigger contact 4, second contact 5. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings to make the advantages and features of the present invention easier for those skilled in the art to understand, thereby making a clearer and more precise definition of the scope of protection of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0021] like Figs. 1-2 As shown: An adaptive multi-fuel integrated ignition frequency conversion control system is used for internal combustion engine control of generators. Specifically, the internal combustion engine is a generator-type engine, which includes a flywheel arranged on the crankshaft by a key connection or other fixed connection method; in a specific implementation, a trigger 2 is arranged on the outside of the outer diameter of the flywheel 1, and the trigger 2 is an electromagnetic induction trigger, and the trigger 2 corresponds to the outer contour of the cam 1; a first contact 3, a trigger contact 4 and a second contact 5 are arranged at intervals on the outer contour of the flywheel 1, wherein each contact is a convex hull arranged on the outside of the minute wheel 1. In a specific implementation, the trigger 2 uses a Hall sensor, and the convex hull height is preferably 1.5 to 2 mm.

[0022] The arc length of the flywheel outer diameter corresponding to the first contact 3 and the trigger contact 4 is equal to the arc length of the flywheel outer diameter corresponding to the trigger contact 4 and the second contact 5. The system also includes a control module, which specifically adopts an HC32L MCU. The control module is electrically connected to a regulating valve, and the opening of the regulating valve can be adjusted from 0 to full opening. The opening of the regulating valve can adjust the amount of fuel entering the internal combustion engine. The trigger 2 is electrically connected to the control module. The trigger 2 is used to record the trigger time and trigger time interval of each contact and the trigger 2. The control module controls the opening angle of the regulating valve according to the time interval and also ignites when it is triggered by the trigger contact 4.

[0023] In implementation, the arc length corresponding to the first contact 3 and the second contact 4 is arc length A; the arc length corresponding to the second contact 3 and the third contact 4 is arc length B; the arc length of the first contact 4 and the third contact 5 on the side opposite to the second contact 4 is arc length C, wherein arc length A is equal to arc length B, and both are smaller than arc length C; in specific implementation, the included angle corresponding to arc length A is preferably 28-32°; through the distance setting between the contacts, the trigger misjudgment rate can be effectively reduced.

[0024] In implementation, a rotating speed sensing module is further arranged on the crankshaft of the internal combustion engine, which specifically adopts a magneto type tachometer and is specifically installed at the end of the crankshaft; the rotating speed sensing module is electrically connected with the control module; the control module controls the opening angle of the adjusting valve according to the rotating speed data, specifically, the opening degree is negatively compensated, that is, the rotating speed becomes faster and the opening angle becomes smaller; through the cooperation of the rotating speed sensor and the opening angle setting, it is beneficial to avoid the imbalance of the fuel ratio at high rotating speed.

[0025] In implementation, a temperature detection module is further arranged on the shell of the internal combustion engine, which specifically adopts an NTC thermistor embedded in the cylinder head; the temperature detection module is electrically connected with the control module; the control module controls the ignition time of the internal combustion engine according to the temperature data, specifically, the opening degree is delayed negatively, that is, the opening degree adjusting time is increased when the temperature rises; through the temperature data, the control module can reduce the ignition delay caused by the excessively high temperature.

[0026] In implementation, a pressure sensing module is further arranged on the intake pipeline of the internal combustion engine, which specifically adopts a piezoresistive sensor; the pressure sensing module is electrically connected with the control module; the control module controls the opening angle of the adjusting valve according to the intake pressure; specifically, the opening degree is negatively compensated, and the opening angle is adjusted when the pressure value increases; through the data of the pressure sensing module, the control module controls the opening degree of the adjusting valve, which can reduce the insufficient combustion caused by the fluctuation of the intake pressure.

[0027] In implementation, an output power acquisition module is further included, which specifically adopts a current transformer and is arranged at the output end of the frequency converter and electrically connected with the control module; the control module adjusts the opening angle of the adjusting valve according to the output power; specifically, the opening degree is positively compensated, and the larger the power output is, the larger the opening angle of the adjusting valve is; through the data of the output power acquisition module, the control module controls the adjusting valve, which can avoid the unstable output caused by the sudden increase of the load.

[0028] An adaptive multi-fuel integrated ignition variable frequency control method is applied to the adaptive multi-fuel integrated ignition variable frequency control system, which includes the following steps: S1, identifying the effective ignition trigger point through the non-uniformly divided symmetrical flywheel, the first contact 3, the trigger contact 4 and the second contact 5 on the flywheel; S2, based on the trigger and flywheel rotation timing recognition effective ignition week: the flywheel clockwise rotation interval time T1 from the first contact to the trigger contact and the trigger contact and the second contact interval time T2, if T1 < T2 is determined as effective ignition week, at this time for compression to do work stroke, if T1 > 2 is determined as invalid ignition week, at this time for exhaust to intake stroke; Specifically in the implementation of step S1 and S2, flywheel 1 rotation, the controller module records the trigger (3) and each contact or convex trigger time, the control module calculates the ratio K, wherein K = T1 / T2, T1 is the time interval from contact 3 to contact 4, T2 is the time interval from contact 4 to contact 5, if K < 1 (such as T1 = 8ms, T2 = 12ms), it is judged as effective ignition week (compression → do work); if K > 1 (such as T1 = 15ms, T2 = 10ms), it is judged as invalid ignition week (exhaust → intake); and in the effective ignition, the control module ignites according to the trigger signal of the trigger contact 4 and the trigger 2; S3, real-time acquisition of engine state parameters: including fuel type, specific can be identified by switching switch, output power, cylinder head temperature, intake pressure and speed; Specifically, when the speed is identified to rise, the negative compensation is reduced to reduce the opening angle of the electromagnetic valve; when the temperature of the internal combustion engine is identified to rise, the negative compensation is delayed to delay the ignition action; when the load power is identified to increase, the positive compensation is increased to increase the opening angle of the electromagnetic valve; when the intake pressure is identified to increase, the negative compensation is reduced to reduce the angle increase.

[0029] S4, adaptive fuel control: in the control module, the state parameters of different fuels and the matching program of the adjusting valve opening degree are preset, and the control module matches the corresponding adjusting valve opening angle and time according to the fuel type and real-time state parameter; Before the specific implementation of steps S3 and S4, the compensation formula is preset in the control module, which is specifically θ = θ 0 + Δθ power+ Δθ rpm + Δθ press, T = t + Δt temp Among them, θ 0 is the basic opening degree of the adjusting valve, Δθ power is the load opening compensation, Δθ rpm speed opening compensation, Δθ press pressure opening compensation; T is the actual ignition time, t is the basic ignition time, Δt tempTo compensate for temperature changes; wherein, θ 0 Set according to fuel type; as an example, when natural gas is used Δθ power = +0.2° / %; Δθ rpm = -0.05° / (100rpm), that is, for every 100 rpm of rotation speed, the opening is reduced by 0.05°, Δθ press = -0.3° / kPa, that is, for every 1 kPa of intake pressure, the opening increment is reduced by 0.3°, Δθ press = +0.2° / %, that is, for every 1% increase in load, the opening is increased by 0.2°; Δttemp = -0.01 ms / ℃, that is, for every 1℃ of temperature, the action delay is shortened by 1 ms.

[0030] In specific implementation, the opening of the adjusting valve is also controlled through the power collection sensor, and the specific relationship is as shown in the following table: In the method, the controller can solve the entering amount of different fuels and adapt to the combustion demand of different fuels by controlling the opening of the adjusting valve; wherein, in steps S1 and S2, the time difference triggered by each contact and the trigger can better identify the effective ignition cycle, and the fuel can be ignited in the effective ignition cycle, so that the direct discharge amount of fuel or unignited fuel caused by the coincidence of the ignition cycle and the non-ignition cycle of the traditional mechanical valve can be avoided; in steps S3 and S4, by setting the entering amount of fuel and the opening of the adjusting valve when different fuels, the compatibility of the internal combustion engine to fuel can be improved, and at the same time, the optimal working condition of the internal combustion engine when different fuels can be achieved, the waste rate and the emission rate are greatly reduced, and the stability is greatly improved.

[0031] In actual operation, the scheme replaces the mechanical valve by cooperation of the non-uniform flywheel, the time sequence trigger and the adjusting valve, eliminates the complexity of the installation structure, and controls the ignition time delay and the opening of the adjusting valve by establishing a segmented compensation function based on five-dimensional parameters of fuel type, power, temperature, pressure and rotation speed, so that the combustion efficiency, the elimination of high-temperature knock, the gas mixing ratio and the load effect efficiency are improved.

[0032] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims.

Claims

1. An adaptive multi-fuel integrated ignition frequency conversion control system, applied to the internal combustion engine control of the generator, characterized by: The internal combustion engine comprises a crankshaft, a flywheel (1) is fixedly arranged on the crankshaft, and a trigger (2) is arranged outside the outer diameter of the flywheel (1); a first contact (3), a trigger contact (4) and a second contact (5) are arranged at intervals on the outer contour of the flywheel (1), wherein the arc length of the flywheel outer diameter corresponding to the first contact (3) and the trigger contact (4) is equal to the arc length of the flywheel outer diameter corresponding to the trigger contact (4) and the second contact (5); the system also comprises a control module and a regulating valve electrically connected to the control module, the regulating valve is used to control the amount of fuel entering the internal combustion engine, the trigger is electrically connected to the control module, and the trigger is used to record the contact time and time interval between each contact and the trigger; the control module controls the opening angle of the regulating valve according to the time interval.

2. The adaptive multi-fuel integrated ignition frequency conversion control system according to claim 1, characterized in that: The arc length corresponding to the first contact (3) and the second contact (4) is arc length A; the arc length corresponding to the second contact (3) and the third contact (4) is arc length B; the arc length of the first contact (4) and the third contact (5) on the side opposite to the second contact (4) is arc length C, wherein arc length A is equal to arc length B, and both are smaller than arc length C.

3. The adaptive multi-fuel integrated ignition frequency conversion control system according to claim 1, characterized in that: A rotation speed sensing module is also provided on the crankshaft of the internal combustion engine. The rotation speed sensing module is electrically connected to the control module. The control module controls the opening angle and opening time of the regulating valve according to the rotation speed data.

4. The adaptive multi-fuel integrated ignition frequency conversion control system according to claim 1, characterized in that: A temperature detection module is also provided on the housing of the internal combustion engine. The temperature detection module is electrically connected to the control module. The control module controls the change of the ignition timing of the internal combustion engine according to temperature data.

5. The adaptive multi-fuel integrated ignition frequency conversion control system according to claim 1, characterized in that: A pressure sensing module is also provided on the intake pipe of the internal combustion engine. The pressure sensing module is electrically connected to the control module. The control module controls the opening angle of the regulating valve according to the intake pressure.

6. The adaptive multi-fuel integrated ignition frequency conversion control system according to claim 1, characterized in that: The system further comprises an output power acquisition module which is electrically connected to the control module, and the control module adjusts the opening angle of the regulating valve according to the output power.

7. An adaptive multi-fuel integrated ignition frequency conversion control method, characterized in that: The adaptive multi-fuel integrated ignition frequency conversion control system applied to any one of claims 1 to 6 comprises the following steps: S1, identifying an effective ignition trigger point by using an unequally divided symmetrical flywheel, and a first contact, a trigger contact, and a second contact on the flywheel; S2. Identify a valid ignition cycle based on the trigger and flywheel rotation timing: Obtain the interval time T1 from the first contact to the trigger contact and the interval time T2 from the trigger contact to the second contact when the flywheel rotates clockwise. If T1 < T2, it is determined to be a valid ignition cycle, which is a compression-to-power stroke. If T1 > T2, it is determined to be an invalid ignition cycle, which is an exhaust-to-intake stroke. S3. Real-time collection of engine status parameters: including fuel type, which can be identified by switching on and off, output power, cylinder head temperature, intake pressure, and speed; S4. Adaptive fuel control: A matching program between the state parameters of different fuels and the regulating valve opening is preset in the control module. The control module matches the corresponding regulating valve opening angle and duration according to the fuel type and real-time state parameters.

8. The multi-fuel integrated ignition frequency conversion control method according to claim 7, characterized in that: In step S3, when it is recognized that the speed increases, the solenoid valve opening angle is reduced according to negative compensation; when it is recognized that the temperature of the internal combustion engine increases, the solenoid valve action delay is shortened according to negative compensation; when it is recognized that the load power increases, the solenoid valve opening angle is increased according to positive compensation; when it is recognized that the intake pressure increases, the angle increase is reduced according to negative compensation.

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