CN115095431B - Method for inhibiting knocking of gasoline engine - Google Patents
Method for inhibiting knocking of gasoline engine Download PDFInfo
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- CN115095431B CN115095431B CN202210801031.1A CN202210801031A CN115095431B CN 115095431 B CN115095431 B CN 115095431B CN 202210801031 A CN202210801031 A CN 202210801031A CN 115095431 B CN115095431 B CN 115095431B
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 230000002401 inhibitory effect Effects 0.000 title abstract description 9
- 238000002485 combustion reaction Methods 0.000 claims abstract description 105
- 238000002347 injection Methods 0.000 claims abstract description 41
- 239000007924 injection Substances 0.000 claims abstract description 41
- 230000002269 spontaneous effect Effects 0.000 claims abstract description 15
- 238000007789 sealing Methods 0.000 claims description 48
- 230000002829 reductive effect Effects 0.000 claims description 15
- 230000009471 action Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 abstract description 13
- 230000000694 effects Effects 0.000 abstract description 7
- 230000008859 change Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 78
- 230000008569 process Effects 0.000 description 11
- 238000001816 cooling Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000007865 diluting Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/10—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air having secondary air added to the fuel-air mixture
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
The invention relates to a method for inhibiting knocking of a gasoline engine, which utilizes a one-way valve and an air injection device to inject external air with the temperature lower than that of air in a combustion chamber into the combustion chamber from outside near the inner wall of the combustion chamber near the cylinder sleeve in the stage that spontaneous combustion of the tail end air mixture is possible to occur, so as to dilute the tail end air mixture in the combustion chamber, reduce the temperature of the tail end air mixture and destroy the condition that the tail end air mixture is spontaneous in order to inhibit knocking. The invention provides a new idea for inhibiting knocking from consideration of the condition of destroying spontaneous combustion of the tail end gas mixture. The method of the invention does not need to change the structural parameters of the combustion chamber of the original gasoline engine, only adds the air injection device and the external one-way valve, selects the control parameters according to the actual parameters of each gasoline engine, and carries out accurate control, thus achieving the purpose of suppressing knocking, and having strong pertinence, wide application range and better effect.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method for inhibiting knocking of a gasoline engine.
Background
The gasoline engine is widely applied to a power system of traffic and transportation equipment such as automobiles, and the performance of the gasoline engine determines the power performance of the traffic and transportation equipment. In research on gasoline engines, improving the thermal efficiency of gasoline engines is a hotspot of current research. One of the major obstacles to further improving the thermal efficiency of gasoline engines is the knocking phenomenon.
The gasoline engine undergoes four strokes in one working cycle (refer to fig. 1): the air suction-the piston 4 runs downwards, and the premixed gas enters the combustion chamber through an air inlet channel 22 and an air inlet valve 21 in the cylinder cover 2; the compression-the piston 4 goes upward to compress the premixed gas, when the piston 4 approaches the top dead center, the spark plug 3 ignites, the ignited mixed gas pushes the piston 4 to do work downward and outward, and the exhaust-the exhaust gas is discharged out of the cylinder through the exhaust valve 23 and the exhaust passage 24.
Knock is typically caused by auto-ignition of the end mixture in the cylinder. In the cylinder of the gasoline engine, after the ignition of the spark plug, flame is continuously developed, the mixed gas in the cylinder is gradually combusted, and when the flame is not combusted to the mixed gas at the edge of the combustion chamber, the mixed gas is rapidly increased in pressure and temperature under the action of combustion heat release of the combusted mixed gas and compression of the piston, so that spontaneous combustion occurs, the pressure in the cylinder is further rapidly increased, a violent oscillating pressure wave is generated in the cylinder, the gasoline engine is enabled to generate obvious knocking sound and violent vibration, and the phenomenon in the cylinder is called knocking.
Knocking can have a plurality of adverse effects on the engine, so that the engine is overheated and parts are damaged, and meanwhile, the power of the gasoline engine is reduced, the operation is unstable and the thermal efficiency is reduced.
Suppressing the autoignition of the end mixture is a fundamental strategy to avoid knocking from the mechanism of occurrence of knocking, and the autoignition of the end mixture is determined by its temperature, pressure, and composition. Then reducing the temperature, pressure, and changing the composition of the mixture at the end is an important method of suppressing knocking.
In the prior art, common knock suppression methods are: reasonably designing the shape of the combustion chamber and properly arranging the spark plug positions so as to shorten the flame propagation distance; the clearance height is reduced, and the cooling of the end mixed gas which is farthest from the spark plug is enhanced; the intake and exhaust overlap period is prolonged, and the temperature of the mixed gas in the cylinder is reduced. In these methods, the cylinder is closed and the total amount of the air-fuel mixture in the cylinder is not changed without the participation of external air, so that the effect of suppressing knocking is limited.
At present, knocking still exists widely, and a new and more effective method for suppressing the knocking is still needed to be explored so as to improve the thermal efficiency of the gasoline engine.
Disclosure of Invention
In order to overcome the defects or shortcomings of the prior art, the invention provides a novel method for inhibiting the knocking of the gasoline engine, which is used for achieving the purpose of more effectively inhibiting the knocking by spraying external gas near the inner wall surface of the cylinder sleeve of the combustion chamber, diluting the tail end mixed gas and reducing the temperature of the tail end mixed gas.
In order to solve the technical problems, the invention comprises the following components:
the invention relates to a method for inhibiting knocking of a gasoline engine, which is characterized in that a plurality of external one-way valves capable of being opened from the outside are arranged on the circumference of one side of a round cylinder gasket facing the outside between a cylinder cover and a cylinder sleeve of a gasoline engine cylinder; the air injection device is arranged and communicated with the external one-way valve, and the air injection device is stored and can inject external gas into the combustion chamber; the jet device is combined with the combined action of the external check valve, and in the stage of spontaneous combustion of the tail end mixed gas, the external gas is sprayed into the combustion chamber from the outside, the tail end mixed gas in the combustion chamber is diluted, the temperature of the tail end mixed gas is reduced, and the jet method comprises the following steps:
s1: the air injection device is a compressible sealing body arranged at the inner wall of the cylinder sleeve below the cylinder cover in the combustion chamber, a cavity capable of containing external air is formed in the compressible sealing body, the cavity is communicated with the external one-way valve, the external air can enter the cavity through the external one-way valve, the compressible sealing body is telescopic, the volume of the cavity is variable, and a plurality of internal one-way valves capable of being opened from the inside of the compressible sealing body are arranged on the circumference of the compressible sealing body facing one side of the combustion chamber;
s2: starting to inhale, when the piston runs downwards, the air pressure in the combustion chamber is reduced, the compressible sealing body is expanded, the pressure in the cavity is reduced until the outer one-way valve on the cylinder gasket is automatically opened, the compressible sealing body starts to inhale the external air with the temperature lower than the temperature of the air in the combustion chamber from the outside, at the moment, the pressure in the cavity is lower than the pressure of the air in the combustion chamber, and the inner one-way valve is in a closed state;
s3: stopping the air suction, and starting to compress the premixed gas in the combustion chamber when the piston moves upwards after reaching the bottom dead center, wherein the compressible sealing body is compressed, the pressure in the cavity rises along with the premixed gas until the pressure rises to the outside, the one-way valve is closed, and the compressible sealing body stops the air suction;
s4, the following steps: after the air injection is started and the air suction is finished, the piston still continues to ascend, the gas pressure in the combustion chamber continues to rise, the compressible sealing body is further compressed, the gas pressure in the cavity rises, when the compressible sealing body rises to open the inner one-way valve, the external gas stored in the compressible sealing body starts to be sprayed into the inner wall of the cylinder sleeve in the combustion chamber from the inner one-way valve, and at the moment, the outer one-way valve is in a closed state because the pressure of the cavity is higher than the external pressure;
s5: stopping air injection, descending when the piston reaches the upper dead point, gradually reducing the pressure of the gas in the combustion chamber, reducing the pressure in the cavity, closing the inner one-way valve, and stopping air injection to the cylinder by the compressible sealing body;
s6: the gasoline engine enters the next working cycle, and the steps S2, S3, S4 and S5 are repeated.
On the basis of the above-mentioned air injection method, the following modifications may be made:
s1: each external one-way valve on the cylinder pad is connected with an external air source through an air pipe, and an electronic control unit of the gasoline engine is connected with and controls an external air source switch;
s2: when the gas pressure in the combustion chamber is lower than a pressure set value b preset by the electronic control unit, the electronic control unit controls an external gas source to be opened, and the external one-way valve is opened, so that the compressible sealing body starts to suck air;
s3: when the gas pressure in the combustion chamber is higher than the preset pressure set value a of the electronic control unit, the electronic control unit controls the external gas source to be closed, the external one-way valve is closed, and the compressible sealing body stops sucking.
The air injection method can also comprise the following steps:
a1: the air injection device is a high-pressure air tank arranged outside the air cylinder, the high-pressure air tank is connected with each external one-way valve through a pneumatic pipe, and an electronic control unit of the gasoline engine is connected with the high-pressure air tank and controls the opening and closing of a valve of the high-pressure air tank;
a2: starting air injection, and when the piston ascends to compress premixed gas in the combustion chamber, and the pressure of the premixed gas is higher than a pressure set value c preset by the electronic control unit, the electronic control unit controls the high-pressure air tank to be opened, the high-pressure gas opens an external one-way valve from the outside, and external air with the temperature lower than that of the combustion chamber is automatically injected into the combustion chamber;
a3: and stopping air injection, wherein when the ignited gas pushes the piston to run downwards, the pressure in the combustion chamber is reduced, and when the pressure is lower than a preset pressure set value d, the electronic control unit controls the high-pressure air tank to be closed, and the external one-way valve is closed to stop air injection into the combustion chamber.
A4: the gasoline engine enters the next working cycle, and the steps A2 and A3 are repeated.
The external gas is air or combustion exhaust gas.
The plurality of outer check valves are uniformly arranged along the circumference of the cylinder gasket.
The plurality of internal check valves are uniformly disposed along the circumference of the compressible seal.
The pressure set point a, b, c, d of the electronic control unit is obtained through specific parameter tests of each gasoline engine.
The pneumatic tube is preferably a polyurethane yarn clamping tube with high pressure resistance.
Compared with the prior art, the invention has the advantages that:
according to the invention, from the consideration of the condition of destroying the spontaneous combustion of the tail end mixed gas, a new idea for suppressing knocking is provided, namely, the external gas with the temperature lower than that of the gas in the combustion chamber is sprayed into the inner wall of the cylinder sleeve of the combustion chamber at proper time, the characteristics of diluting and cooling the gas in the combustion chamber by the external gas are fully utilized, so that the tail end mixed gas cannot have the spontaneous combustion condition, and further, the spontaneous combustion of the tail end mixed gas is avoided, thereby suppressing knocking.
The method of the invention does not need to change the structural parameters of the combustion chamber of the original gasoline engine, only adds the air injection device and the external one-way valve, selects the control parameters according to the actual parameters of each gasoline engine (even each gasoline engine), and carries out accurate control, thus achieving the purpose of suppressing knocking, and having strong pertinence, wide application range and better effect.
Drawings
Fig. 1: a front view of a first embodiment of the present invention;
fig. 2: a cross-sectional view at A-A of embodiment one of the present invention;
fig. 3: A-A of the second embodiment of the invention;
fig. 4: a cross-sectional view at A-A of embodiment three of the present invention.
Detailed Description
The conception, specific structure, and technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, features, and effects of the present invention.
Knocking of a gasoline engine is caused by spontaneous combustion of a tip mixture after a pre-combustion gas in a combustion chamber is ignited. The combustion chamber of the gasoline engine is a closed space formed by the bottom surface (including an air valve) of the cylinder cover 2, the inner wall of the cylinder sleeve 1 and the top surface of the piston 4, wherein a cylinder gasket 7 is arranged between the cylinder cover 2 and the cylinder sleeve 1, and the cylinder gasket 7 is also arranged in the combustion chamber.
The method for suppressing knocking of the gasoline engine is to inject gas into the combustion chamber from the outside of the combustion chamber near the inner wall of the combustion chamber close to the cylinder sleeve 1 in the stage that spontaneous combustion of the tail end mixed gas is likely to occur, dilute the tail end mixed gas in the combustion chamber, reduce the temperature of the tail end mixed gas and destroy the condition that spontaneous combustion of the tail end mixed gas occurs, thereby suppressing knocking.
As shown in fig. 1 to 4, the injection of the external air into the combustion chamber is achieved by the co-action of the air injection means and the external check valve 51 on the head gasket 7. The present invention provides a plurality of external check valves 51 which can be opened from the outside on the circumference of the side of the circular gasket 7 facing the outside between the cylinder liner 1 and the cylinder head 2. The air injection device is communicated with the outer check valve 51, and the air injection device stores and timely injects external air into the combustion chamber. When the gas pressure in the combustion chamber is higher than a certain set value, external gas with the temperature lower than that of the gas in the combustion chamber is sprayed into the inner wall of the combustion chamber cylinder sleeve 1 through the external one-way valve 51 and the air spraying device; when the pressure in the combustion chamber is lower than another set value, the air injection into the combustion chamber is stopped. And (3) spraying external air into the cylinder once when the gasoline engine completes one working cycle.
The outer check valve 51 and the air injection device are arranged in different positions and modes, and the air injection method for suppressing knocking is also different. The following three examples are given to illustrate various embodiments of the present invention for suppressing knocking.
An embodiment one is described with reference to fig. 1 and 2.
The air injection device of the embodiment is a compressible sealing body 5 arranged at the inner wall of a cylinder sleeve 1 below a cylinder cover 2 in a combustion chamber, a cavity 8 capable of containing external air is arranged in the compressible sealing body 5, the cavity 8 is communicated with each external one-way valve 51, the external air can enter the cavity 8 through the external one-way valves 51, the compressible sealing body 5 can stretch and retract, the volume of the cavity 8 can be changed, and a plurality of internal one-way valves 54 capable of opening from the inside of the compressible sealing body 5 are arranged on the circumference of the side of the compressible sealing body 5 facing the combustion chamber.
The air injection method of the first embodiment specifically comprises the following steps: when the gasoline engine piston 4 runs downwards, the air pressure in the combustion chamber is reduced, the compressible sealing body 5 expands, the pressure in the cavity 8 is reduced, when the pressure in the cavity 8 is reduced to be lower than the atmospheric pressure and the pressure difference value is larger than the opening pressure of the outer one-way valve 51, the outer one-way valve 51 is automatically opened from the outside, and the compressible sealing body 5 starts to suck the external air with the temperature lower than the temperature of the air in the combustion chamber from the outside; when the piston 4 moves up after reaching the bottom dead center, the premixed gas in the combustion chamber starts to be compressed, the compressible sealing body 5 is compressed, the pressure in the cavity 8 rises along with the premixed gas, when the pressure in the cavity 8 rises to be higher than the atmospheric pressure or the pressure in the cavity 8 is lower than the atmospheric pressure, but the pressure difference value is smaller than the opening pressure of the outer one-way valve 51, the outer one-way valve 51 is closed, the compressible sealing body 5 stops sucking, and in the process, the inner one-way valve 54 is in a closed state because the pressure in the cavity 8 is lower than the pressure of the gas in the combustion chamber, and the process is the sucking process of the compressible sealing body 5. The start and stop of the inhalation process is automatically controlled by the opening pressure of the outer check valve 51.
After the air suction process is finished, the piston 4 still continues to ascend, the gas pressure in the combustion chamber continues to rise, the compressible sealing body 5 is further compressed, the gas pressure in the smaller cavity 8 rises rapidly, and when the internal one-way valve 54 is opened, the external gas stored in the compressible sealing body 5 starts to be sprayed into the inner wall of the cylinder sleeve 1 in the combustion chamber from the internal one-way valve 54; when the piston 4 descends after reaching the top dead center, the pressure of the gas in the combustion chamber gradually decreases, the pressure in the cavity 8 decreases along with the decrease, the inner check valve 54 closes, the compressible sealing body 5 stops injecting air into the cylinder, and in the process, the outer check valve 51 is closed because the pressure in the cavity 8 is higher than the atmospheric pressure, and the air injection process is performed. The start and stop of the air injection process is automatically controlled by the opening pressure of the inner check valve 54.
The compressible sealing body 5 sucks air and jets air once every time the petrol engine completes one working cycle.
The plurality of outer check valves 51 are equally disposed along the circumference of the cylinder head gasket 7, and the plurality of inner check valves 54 are equally disposed along the circumference of the compressible sealing body 5 (see fig. 2).
Embodiment two is described with reference to fig. 3.
On the basis of the first embodiment, the second embodiment is added with an external air source (not shown in the figure), the external air source is connected with each external one-way valve 51 on the cylinder gasket 7 through an air pipe, and an Electronic Control Unit (ECU) of the gasoline engine is connected with and controls the on-off of the external air source.
In the air suction process of the first air injection method, in the second embodiment, the opening pressure of the outer check valve 51 is not automatically controlled, but the electronic control unit controls the opening and closing of the outer air source and the outer check valve 51 according to the relation between the detected combustion chamber pressure value and the preset value. Specifically, when the gas pressure in the combustion chamber is lower than the pressure set value b preset by the electronic control unit, the electronic control unit controls the external gas source to be opened, the external one-way valve 51 is opened (the pressure of the external gas source is adjustable according to the pressure in the cavity 8), the compressible sealing body 5 sucks in the external gas, and when the gas pressure in the combustion chamber is higher than the pressure set value a preset by the electronic control unit, the electronic control unit controls the external gas source to be closed, and the external one-way valve 51 is closed accordingly to stop sucking.
Embodiment two actively controls the start and end of the suction process of the compressible sealing body 5 according to the pressure value of the combustion chamber. The subsequent air injection process is the same as in example one.
Embodiment three is described with reference to fig. 4.
In the second embodiment, the compressible sealing body 5 of the first embodiment is removed, a high-pressure air tank (not shown in the figure) is arranged outside the air cylinder as an air injection device, the high-pressure air tank is connected with each external one-way valve 51 on the cylinder pad 7 through an air pipe, and an Electronic Control Unit (ECU) of the gasoline engine is connected with the high-pressure air tank. The electronic control unit controls the opening and closing of the high-pressure gas tank valve according to a preset pressure set value c and a preset pressure set value d in the combustion chamber, and then controls the gas injection in the combustion chamber at proper time.
Specifically, when the piston 4 is up compressing the premixed gas in the combustion chamber, the pressure in the combustion chamber rises, and the pressure is higher than the pressure set value c preset by the electronic control unit, the electronic control unit controls the high-pressure gas tank to open, the high-pressure gas opens the external one-way valve 51 from the outside, and the external gas with the temperature lower than the temperature of the combustion chamber is injected into the combustion chamber; when the ignited gas pushes the piston 4 to run downwards, the pressure in the combustion chamber is reduced, and when the pressure is lower than a preset pressure set value d, the electronic control unit controls the high-pressure gas tank to be closed, and the outer one-way valve 51 is closed accordingly, so that the gas injection into the combustion chamber is stopped.
The opening pressure of the outer check valve 51 of this embodiment is much greater than that of the outer check valves 51 of the first and second embodiments.
The pneumatic tube of this embodiment is preferably a high pressure resistant Polyurethane (PU) yarn clamping tube.
The plurality of outer check valves 51 are equally arranged along the circumference of the cylinder head gasket 7.
In the above second and third embodiments, the pressure setting value a, b, c, d of the electronic control unit is obtained by a specific parameter test of each gasoline engine.
The external air sprayed into the combustion chamber can be air or waste gas after combustion.
From the three embodiments, the invention breaks through the technical scheme of solving knocking from the structural design and control parameters of the combustion chamber in the prior art, and brings forward a completely different new thought from the consideration of the condition of destroying spontaneous combustion of the tail end mixed gas, namely, the external gas with the temperature lower than that of the gas in the combustion chamber is sprayed into the inner wall of the cylinder sleeve of the combustion chamber at proper time, and the characteristics of diluting and cooling the gas in the combustion chamber by the external gas are fully utilized, so that the tail end mixed gas cannot have the spontaneous combustion condition, and further the spontaneous combustion of the tail end mixed gas is avoided, thereby inhibiting knocking.
The method of the invention does not need to change the structural parameters of the combustion chamber of the original gasoline engine, only adds the air injection device and the external one-way valve, selects the control parameters according to the actual parameters of each gasoline engine (even each gasoline engine), and carries out accurate control, thus achieving the purpose of suppressing knocking, and having strong pertinence, wide application range and better effect.
The above embodiments are only for illustrating the present invention, and are not limiting of the present invention. While the invention has been described in detail with reference to the embodiments, those skilled in the art will appreciate that various combinations, modifications, and equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and it is intended to cover the scope of the claims of the present invention.
Claims (6)
1. A method for suppressing knocking of a gasoline engine, characterized in that a plurality of external check valves (51) capable of being opened from the outside are provided on the circumference of a circular gasket (7) between a cylinder head (2) and a cylinder liner (1) of a gasoline engine cylinder toward the outside; an air injection device is arranged and communicated with the outer one-way valve (51), and the air injection device is stored and can inject external air into the combustion chamber; by utilizing the combined action of the air injection device and the outer one-way valve (51), in the stage that the spontaneous combustion of the tail end mixed gas occurs, the external gas is injected into the combustion chamber from the outside, the tail end mixed gas in the combustion chamber is diluted, the temperature of the tail end mixed gas is reduced, and the air injection method comprises the following steps:
s1: the air injection device is a compressible sealing body (5) arranged at the inner wall of the cylinder sleeve (1) below the cylinder cover (2) in the combustion chamber, a cavity (8) capable of containing external air is formed in the compressible sealing body (5), the cavity (8) is communicated with the external one-way valve (51), the external air can enter the cavity (8) through the external one-way valve (51), the compressible sealing body (5) is telescopic, so that the volume of the cavity (8) is variable, and a plurality of internal one-way valves (54) capable of being opened from the inside of the compressible sealing body (5) are arranged on the circumference of one side of the compressible sealing body (5) facing the combustion chamber;
s2: starting to inhale, when the piston (4) runs downwards, the air pressure in the combustion chamber is reduced, the compressible sealing body (5) is expanded, the pressure in the cavity (8) is reduced until the outer one-way valve (51) on the cylinder gasket (7) is automatically opened, the compressible sealing body (5) starts to inhale the external air with the temperature lower than the temperature of the air in the combustion chamber from the outside, at the moment, the pressure of the cavity (8) is lower than the pressure of the air in the combustion chamber, and the inner one-way valve (54) is in a closed state;
s3: terminating the suction, when the piston (4) moves upwards after reaching the bottom dead center, starting to compress the premixed gas in the combustion chamber, wherein the compressible sealing body (5) is compressed, the pressure in the cavity (8) rises along with the premixed gas until the pressure rises until the outer one-way valve (51) is closed, and the compressible sealing body (5) stops the suction;
s4: starting air injection, after air suction is finished, the piston (4) still continues to ascend, the gas pressure in the combustion chamber continues to rise, the compressible sealing body (5) is further compressed, the gas pressure in the cavity (8) rises, when the internal one-way valve (54) is opened, external gas stored in the compressible sealing body (5) starts to be injected into the inner wall of the cylinder sleeve (1) in the combustion chamber from the internal one-way valve (54), and at the moment, the external one-way valve (51) is in a closed state because the pressure in the cavity (8) is higher than the external pressure;
s5: terminating the air injection, descending the piston (4) after reaching the upper dead point, gradually reducing the pressure of the gas in the combustion chamber, reducing the pressure in the cavity (8) along with the descending until the inner one-way valve (54) is closed, and stopping the air injection into the cylinder by the compressible sealing body (5);
s6: the gasoline engine enters the next working cycle, and the steps S2, S3, S4 and S5 are repeated.
2. The method for suppressing knocking of a gasoline engine according to claim 1, wherein said air injection method comprises the steps of:
s1: each outer one-way valve (51) on the cylinder gasket (7) is connected with an external air source through an air pipe, and an electronic control unit of the gasoline engine is connected with and controls an external air source switch;
s2: when the gas pressure in the combustion chamber is lower than a pressure set value b preset by the electronic control unit, the electronic control unit controls an external gas source to be opened, the external one-way valve (51) is opened, and the compressible sealing body (5) starts to suck air;
s3: when the gas pressure in the combustion chamber is higher than a pressure set value a preset by the electronic control unit, the electronic control unit controls to close an external gas source, the external one-way valve (51) is closed, and the compressible sealing body (5) terminates the suction.
3. The method for suppressing knocking of a gasoline engine according to claim 1 or 2, wherein the external air is air or combustion exhaust gas.
4. Method for suppressing knocking of a gasoline engine according to claim 1 or 2, characterized in that a plurality of said outer check valves (51) are uniformly arranged along the circumference of said cylinder head gasket (7).
5. Method for suppressing knocking in a gasoline engine according to claim 1 or 2, characterized in that a plurality of said internal non-return valves (54) are uniformly arranged along the circumference of said compressible sealing body (5).
6. The method for suppressing knocking of a gasoline engine according to claim 2, wherein the pressure setting values a, b of the electronic control unit are obtained by specific parameter tests of each gasoline engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210801031.1A CN115095431B (en) | 2022-07-08 | 2022-07-08 | Method for inhibiting knocking of gasoline engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210801031.1A CN115095431B (en) | 2022-07-08 | 2022-07-08 | Method for inhibiting knocking of gasoline engine |
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| Publication Number | Publication Date |
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| CN115095431A CN115095431A (en) | 2022-09-23 |
| CN115095431B true CN115095431B (en) | 2024-01-05 |
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| CN202210801031.1A Active CN115095431B (en) | 2022-07-08 | 2022-07-08 | Method for inhibiting knocking of gasoline engine |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5246210A (en) * | 1975-10-08 | 1977-04-12 | Toyo Bearing Mfg Co | Air supply valve device for engine |
| JP2004003428A (en) * | 2002-04-24 | 2004-01-08 | Toyota Motor Corp | Auxiliary combustion device for internal combustion engine |
| CN107725169A (en) * | 2017-12-06 | 2018-02-23 | 重庆理工大学 | A kind of anti-knock engine |
| CN107747517A (en) * | 2017-11-28 | 2018-03-02 | 天津大学 | It is a kind of to be used to suppress double direct-injection systems in the cylinder of pinking |
| JP2021008874A (en) * | 2019-07-03 | 2021-01-28 | 株式会社Ｓｕｂａｒｕ | Engine system |
| KR20210148675A (en) * | 2020-06-01 | 2021-12-08 | 현대자동차주식회사 | Apparatus of injecting fuel for engine |
| CN114412648A (en) * | 2022-01-27 | 2022-04-29 | 南昌济铃新能源科技有限责任公司 | Combustion organization method and system for inhibiting gasoline engine knocking |
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2022
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| JPS5246210A (en) * | 1975-10-08 | 1977-04-12 | Toyo Bearing Mfg Co | Air supply valve device for engine |
| JP2004003428A (en) * | 2002-04-24 | 2004-01-08 | Toyota Motor Corp | Auxiliary combustion device for internal combustion engine |
| CN107747517A (en) * | 2017-11-28 | 2018-03-02 | 天津大学 | It is a kind of to be used to suppress double direct-injection systems in the cylinder of pinking |
| CN107725169A (en) * | 2017-12-06 | 2018-02-23 | 重庆理工大学 | A kind of anti-knock engine |
| JP2021008874A (en) * | 2019-07-03 | 2021-01-28 | 株式会社Ｓｕｂａｒｕ | Engine system |
| KR20210148675A (en) * | 2020-06-01 | 2021-12-08 | 현대자동차주식회사 | Apparatus of injecting fuel for engine |
| CN114412648A (en) * | 2022-01-27 | 2022-04-29 | 南昌济铃新能源科技有限责任公司 | Combustion organization method and system for inhibiting gasoline engine knocking |
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| CN115095431A (en) | 2022-09-23 |
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