CN115929529B - Engine ignition device for methanol fuel vehicle, starting method and methanol fuel vehicle - Google Patents
Engine ignition device for methanol fuel vehicle, starting method and methanol fuel vehicle Download PDFInfo
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- CN115929529B CN115929529B CN202310044600.7A CN202310044600A CN115929529B CN 115929529 B CN115929529 B CN 115929529B CN 202310044600 A CN202310044600 A CN 202310044600A CN 115929529 B CN115929529 B CN 115929529B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an engine ignition device for a methanol fuel vehicle, a starting method and the methanol fuel vehicle, wherein the engine ignition device for the methanol fuel vehicle comprises an engine cylinder body, a main spark plug and a precombustion spark plug which are arranged on the engine cylinder body, the precombustion spark plug comprises a precombustion shell and a first heating device which is arranged on the precombustion shell, the first heating device is used for heating the precombustion chamber of the precombustion shell, a plurality of spray holes are uniformly arranged at the bottom of the precombustion shell at intervals along the circumferential direction, the engine ignition device for the methanol fuel vehicle further comprises a second heating device which is arranged at the communication position of an air inlet manifold and the air inlet manifold, and the second heating device is used for heating air in the air inlet manifold and the air inlet manifold. The method is suitable for vehicles using methanol as fuel, can effectively improve the phenomenon of difficult cold start of the engine, can effectively reduce the energy consumption of the engine during cold start, and can effectively improve the running stability of the engine.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to an engine ignition device for a methanol fuel vehicle, a starting method and the methanol fuel vehicle.
Background
The methanol has the advantages of rich raw material sources, mature production process, good combustion performance, less pollutant emission, low production cost, convenient transportation and storage and the like, so the methanol is considered as one of the most potential vehicle alternative fuels. However, the vaporization latent heat of methanol is substantially 3.7 times that of gasoline, and in particular, when the temperature of both methanol and gasoline is 20 ℃, the vaporization amount of the methanol fuel is only 1/4 of that of gasoline, and when the temperature of methanol is 7 ℃, the vaporization amount of the methanol fuel is 1/6 of that of 20 ℃, so that the vaporization amount of methanol is greatly affected by the temperature.
In the prior art, an engine ignition device is provided with a pre-ignition spark plug and a main spark plug, wherein the pre-ignition spark plug is mainly used for normal ignition, and the main spark plug is used for improving cold start. However, such an engine ignition device is not suitable for a methanol-fueled engine, and the starting method is not suitable for a methanol-fueled vehicle.
Disclosure of Invention
The invention aims to provide an engine ignition device for a methanol fuel vehicle, a starting method and the methanol fuel vehicle, so as to solve the problem that the engine ignition device in the prior art cannot be suitable for vehicles using methanol as fuel.
To achieve the purpose, the invention adopts the following technical scheme:
the engine ignition device for the methanol fuel vehicle comprises an engine cylinder body, a main spark plug and a pre-combustion spark plug, wherein the main spark plug and the pre-combustion spark plug are arranged on the engine cylinder body, the pre-combustion spark plug comprises a pre-combustion shell and a first heating device arranged on the pre-combustion shell, the first heating device is used for heating the pre-combustion chamber of the pre-combustion shell, a plurality of spray holes are uniformly arranged at the bottom of the pre-combustion shell along the circumferential direction at intervals, the engine ignition device for the methanol fuel vehicle further comprises a second heating device arranged at the communication position of an air inlet manifold and the air inlet manifold, and the second heating device is used for heating air in the air inlet manifold and the air inlet manifold.
Preferably, the first heating device comprises a resistance wire, the resistance wire is integrally formed in the pre-combustion shell, and an insulating layer is arranged on the outer peripheral surface of the resistance wire.
Preferably, the resistance wire is spirally wound in the precombustion housing.
Preferably, the engine cylinder body is provided with two intake valves and two exhaust valves, the two intake valves and the two exhaust valves are distributed at intervals along a first direction, the two intake valves are arranged at intervals along a second direction, the two exhaust valves are also arranged at intervals along the second direction, and the first direction and the second direction are perpendicular to each other and are perpendicular to the height direction of the engine cylinder body;
the pre-combustion spark plugs and the main spark plugs are distributed at intervals along the first direction, the pre-combustion spark plugs and the main spark plugs are distributed on a first symmetrical axis of the section of the engine cylinder body, the pre-combustion spark plugs are relatively close to the air inlet side of the main spark plugs, and the first symmetrical axis is parallel to the first direction.
Preferably, a distance between the pre-combustion spark plug and a second symmetry axis of the engine block section is L1, a distance between the main spark plug and the second symmetry axis of the engine block section is L2, L1 is less than L2, and the second symmetry axis is parallel to the second direction.
Preferably, the volume of the precombustion chamber is in the range of 1000mm 3 ～1500mm 3 。
Preferably, the aperture range of the spray hole is 1.2 mm-2 mm; the range of the spiral angle of the spray hole is 0-5 degrees.
The methanol fuel vehicle starting method is used for controlling the engine ignition device for the methanol fuel vehicle, and comprises the following steps:
s100, judging whether the engine is started in a cold mode according to the ambient temperature; wherein, the engine start comprises cold start and normal start;
if the engine is started in a cold state, executing step S200;
s200, starting a first heating device; activating the second heating device;
s300, after a first set period of time, closing the first heating device and the second heating device, and starting an engine;
s400, igniting the pre-ignition spark plug;
s500, judging whether the engine is started or not according to the rotation speed of the engine;
if the engine is started, sequentially executing steps S600 and S700;
if the engine is not started, returning to the step S200 until the engine is started;
s600, stopping ignition after the pre-ignition spark plug operates for a second set time period;
and S700, igniting the main spark plug.
Preferably, the specific step of judging whether the engine is cold started or not at the time of starting according to the ambient temperature comprises the following steps:
judging whether the ambient temperature is less than or equal to a set temperature;
if the ambient temperature is less than or equal to the set temperature, the engine is started in a cold mode;
and if the ambient temperature is higher than the set temperature, the engine is started normally when the engine is started.
Preferably, the set temperature is 16 ℃.
Preferably, the first set time period is 5 seconds or longer.
Preferably, the second setting time is 7 seconds or longer.
Preferably, if the engine is started normally, step S800 is executed;
s800, starting the engine;
and S900, igniting the main spark plug.
Preferably, the following steps are further included after both step S700 and step S900:
s1000, judging whether the engine speed and the engine torque are normal or not;
if the engine speed and the engine torque are normal, the engine is operated normally, and step S1100 is executed;
if there is an abnormality in one of the engine speed and the engine torque, step S1200 is performed;
s1100, the main spark plug operates and outputs a signal of normal ignition of the main spark plug;
s1200, the pre-ignition spark plug operates, and a main spark plug ignition abnormality signal is output.
Preferably, the specific step of judging whether the engine speed and the engine torque are normal includes:
judging whether the engine speed is increased or not and whether the engine torque is increased or not after the main spark plug is ignited;
if the engine speed is increased, the engine speed is normal;
if the engine torque increases, the engine torque is normal.
The methanol fuel vehicle comprises the engine ignition device for the methanol fuel vehicle.
The invention has the beneficial effects that:
the invention aims to provide an engine ignition device for a methanol fuel vehicle, a starting method and a methanol fuel vehicle, wherein the engine ignition device for the methanol fuel vehicle can be suitable for vehicles taking methanol as fuel, can effectively improve the phenomenon of difficult cold start of an engine, can effectively reduce the energy consumption during cold start of the engine, and can effectively improve the running stability of the engine.
The engine ignition device for the methanol fuel vehicle judges whether the engine is started cold or not according to the ambient temperature, if the engine is started cold, the first heating device and the second heating device are synchronously started, the precombustion chamber of the precombustion housing is heated through the first heating device, the mixed gas in the air inlet manifold is heated through the second heating device, and the air in the air inlet manifold is heated for a period of time, the first heating device and the second heating device are closed, and the engine is started, wherein the heating time is enough to enable the temperature in the precombustion chamber of the precombustion housing to rise to a certain temperature, the mixed gas flowing into the engine cylinder can be heated, and it can be understood that the mixed gas flowing into the engine cylinder can enter the precombustion chamber through the spray holes in the precombustion housing.
Drawings
FIG. 1 is a cross-sectional view of a pre-ignition spark plug of an engine ignition device for a methanol-fueled vehicle, taken along a first perspective, in accordance with an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a pre-ignition spark plug of an engine ignition device for a methanol-fueled vehicle, taken along a second perspective, in accordance with an embodiment of the present invention;
FIG. 3 is a schematic diagram of an engine ignition device for a methanol-fueled vehicle according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method for starting a methanol fuel vehicle in accordance with an embodiment of the present invention;
fig. 5 is a second flowchart of a method for starting a methanol fuel vehicle according to an embodiment of the present invention.
In the figure:
1. an engine block; 11. an intake valve; 12. an exhaust valve; 13. a first axis of symmetry; 14. a second symmetry axis;
2. a main spark plug;
3. a pre-ignition spark plug; 31. a precombustion housing; 32. a precombustion chamber; 33. a spray hole; 34. an electrode;
4. a resistance wire.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
In the prior art, an engine ignition device is provided with a pre-ignition spark plug and a main spark plug, wherein the pre-ignition spark plug is mainly used for normal ignition, and the main spark plug is used for improving cold start. However, such an engine ignition device is not suitable for a methanol-fueled engine, and the starting method is not suitable for a methanol-fueled vehicle.
The invention provides an engine ignition device for a methanol fuel vehicle, which comprises an engine cylinder body 1, a main spark plug 2 and a pre-combustion spark plug 3, wherein the main spark plug 2 and the pre-combustion spark plug 3 are arranged on the engine cylinder body 1, the pre-combustion spark plug 3 comprises a pre-combustion shell 31 and a first heating device arranged on the pre-combustion shell 31, the first heating device is used for heating a pre-combustion chamber 32 of the pre-combustion shell 31, a plurality of spray holes 33 are uniformly arranged at the bottom of the pre-combustion shell 31 at intervals along the circumferential direction, the engine ignition device for the methanol fuel vehicle also comprises a second heating device arranged at the communication position of an air inlet manifold and the air inlet manifold, and the second heating device is used for heating air in the air inlet manifold and the air inlet manifold.
The engine ignition device for the methanol fuel vehicle judges whether the engine is started cold or not according to the ambient temperature, if the engine is started cold, the first heating device and the second heating device are synchronously started, the pre-combustion chamber 32 of the pre-combustion shell 31 is heated through the first heating device, the mixed gas in the air inlet manifold is heated through the second heating device, and the air in the air inlet manifold is heated for a period of time, the first heating device and the second heating device are closed, and the engine is started, wherein the heating time is enough to enable the temperature in the pre-combustion chamber 32 of the pre-combustion shell 31 to rise to a certain temperature, the mixed gas flowing into the engine cylinder 1 can be heated, and the mixed gas flowing into the engine cylinder 1 can enter the pre-combustion chamber 32 through the spray holes 33 on the pre-combustion shell 31. In this embodiment, the second heating device is a grid heating device.
As shown in fig. 1 and 2, the first heating device includes a resistance wire 4, the resistance wire 4 is integrally formed in the precombustion housing 31, and an insulating layer is disposed on an outer peripheral surface of the resistance wire 4. Through the integrated forming of the resistance wire 4 in the precombustion shell 31, the resistance wire 4 can synchronously heat the precombustion shell 31 and the precombustion chamber 32, so that the temperature in the precombustion chamber 32 can be quickly increased, and the phenomenon of the volume increase of the precombustion spark plug 3 caused by the arrangement of the first heating device can be avoided; secondly, an insulating layer is arranged on the outer peripheral surface of the resistance wire 4, so that the electrification of the precombustion shell 31 and/or the engine cylinder body 1 caused by the electric leakage of the resistance wire 4 is avoided, and the reliability of the engine ignition device for the methanol fuel vehicle is improved.
Specifically, as shown in fig. 1, the pre-combustion spark plug 3 further includes an electrode 34 fixedly disposed in the pre-combustion casing 31, and the electrode 34 and the nozzle 33 are respectively distributed at two ends of the pre-combustion casing 31 along the height direction. It will be appreciated that ignition is by the electrode 34. The direction ef in fig. 1 is the height direction of the precombustion housing 31.
More specifically, the resistance wire 4 is spirally wound in the pre-combustion casing 31. So set up, can increase the length that resistance wire 4 set up in precombustion casing 31 for precombustion casing 31 and precombustion chamber 32 can be heated fast, and can make precombustion casing 31 and precombustion chamber 32 all even be heated.
As shown in fig. 3, the engine cylinder 1 is provided with two intake valves 11 and two exhaust valves 12, the two intake valves 11 and the two exhaust valves 12 are distributed at intervals along a first direction, the two intake valves 11 are arranged at intervals along a second direction, the two exhaust valves 12 are also arranged at intervals along the second direction, and the first direction and the second direction are perpendicular to each other and are perpendicular to the height direction of the engine cylinder 1; the pre-ignition spark plugs 3 and the main spark plugs 2 are distributed at intervals along the first direction, the pre-ignition spark plugs 3 and the main spark plugs 2 are distributed on a first symmetrical axis 13 of the section of the engine cylinder body 1, the pre-ignition spark plugs 3 are close to the intake valve 11 side relative to the main spark plugs 2, and the first symmetrical axis 13 is parallel to the first direction. It will be appreciated that the two intake valves 11 and the two exhaust valves 12 are in turn evenly spaced apart along the circumference of the engine block 1. Since the temperature near the exhaust valve 12 is high, when the main spark plug 2 does not ignite the mixture gas distributed near the exhaust valve 12, the phenomenon of spontaneous combustion occurs under the action of the temperature near the exhaust valve 12, and the phenomenon of knocking occurs in the engine cylinder 1, so the pre-ignition spark plug 3 is arranged near the intake valve 11 side relative to the main spark plug 2, and it is understood that the main spark plug 2 is arranged near the exhaust valve 12, so that the distance between the flame and the exhaust valve 12 side can be effectively shortened, and the phenomenon of knocking occurs in the engine cylinder 1 can be effectively improved.
Wherein the ab direction in fig. 3 is the first direction; the cd direction in fig. 3 is the second direction. The first direction is parallel to the first symmetry axis 13; the second direction is parallel to the second symmetry axis 14.
Specifically, as shown in fig. 3, the distance between the pre-ignition plug 3 and the second symmetry axis 14 of the section of the engine block 1 ranges from L1, the distance between the main ignition plug 2 and the second symmetry axis 14 of the section of the engine block 1 ranges from L2, L1 < L2, and the second symmetry axis 14 is parallel to the second direction. It is understood that the linear distance between the main ignition plug 2 and the exhaust valve 12 is smaller than the linear distance between the pre-ignition plug 3 and the intake valve 11, so that the distance of flame propagation to the exhaust valve 12 side is shortened, and the phenomenon of knocking occurring in the engine block 1 is effectively improved.
Specifically, in the present embodiment, the volume of the prechamber 32 ranges from 1000mm 3 ～1500mm 3 . It can be understood that the volume of the pre-combustion chamber 32 is far smaller than the volume of the engine block 1, so that the pre-combustion spark plug 3 is used for igniting the mixed gas in the pre-combustion chamber 32, the ignited mixed gas in the pre-combustion chamber 32 is injected into the engine block 1 through the injection hole 33 to ignite the mixed gas in the engine block 1, the phenomenon of difficult cold start of the engine can be effectively improved, and the energy consumption during cold start of the engine can be effectively reduced.
Further specifically, in the present embodiment, the aperture of the nozzle hole 33 ranges from 1.2mm to 2mm; the pitch angle of the nozzle hole 33 ranges from 0 ° to 5 °. Preferably, in this embodiment, the helix angle of the orifice 33 is 0 °. It will be appreciated that the mixture combusted in the prechamber 32 is injected into the engine block 1 along the central axis of the injection orifice 33. In this embodiment, three injection holes 33 are exemplified.
The ignition device of the engine for the methanol fuel vehicle further comprises a controller, wherein the controller is electrically connected with the electrode 34 of the pre-ignition spark plug 3, the resistance wire 4 of the first heating device, the second heating device and the main spark plug 2. The controller is able to control the operation of the electrode 34 of the pre-ignition plug 3, the resistance wire 4 of the first heating means, the second heating means and the main spark plug 2.
Specifically, the engine ignition device for the methanol fuel vehicle further comprises a temperature sensor arranged on the vehicle body, wherein the temperature sensor is electrically connected with the controller and is used for monitoring the ambient temperature. The controller controls the first heating means, the second heating means, the electrode 34 of the pre-ignition spark plug 3, and the operation of the main spark plug 2 in accordance with the electric signal initiated by the temperature sensor.
The specific structure of the main spark plug 2 belongs to the prior art, and is not described herein.
The invention also provides a methanol fuel vehicle starting method which is used for controlling the engine ignition device for the methanol fuel vehicle to ignite the engine. The phenomenon of difficult cold start of the engine can be effectively improved, the energy consumption of the engine during cold start can be effectively reduced, and the running stability of the engine can be effectively improved.
As shown in fig. 4 and 5, the methanol fuel vehicle starting method includes:
s100, judging whether the engine is started in a cold mode according to the ambient temperature; engine starting includes cold starting and normal starting, among others.
Specifically, the specific step of judging whether the engine is cold started or not when the engine is started according to the ambient temperature includes:
and judging whether the ambient temperature is less than or equal to the set temperature.
If the ambient temperature is less than or equal to the set temperature, the engine is started cold. Step S200 is performed.
If the ambient temperature is greater than the set temperature, the engine is started normally when started. Step S800 is performed.
Wherein the set temperature is an empirical value obtained from a number of previous experiments.
Specifically, in the present embodiment, the temperature was set to 16 ℃.
S200, starting a first heating device; the second heating means is activated. It will be appreciated that the first heating means and the second heating means are activated simultaneously, the prechamber 32 of the prechamber 31 is heated by the first heating means, the mixture in the inlet manifold is heated by the second heating means, and the air in the inlet manifold is heated.
S300, after a first set period of time, the first heating device and the second heating device are turned off, and the engine is started.
Specifically, the first set period is an empirical value obtained by a large number of experiments in the early stage.
Specifically, the first set time period is 5 seconds or longer. Preferably, in this embodiment, the first set duration is 5 seconds.
It will be appreciated that the first set period is sufficient to raise the temperature in the prechamber 32 of the prechamber 31 to a certain temperature, and also to heat the mixture flowing into the engine block 1, so that the mixture flowing into the prechamber 32 through the nozzle of the prechamber 31 can be quickly changed into a high-temperature mixture, which is convenient for the electrode 34 of the precharacterizing plug 3 to ignite the high-temperature mixture.
And S400, igniting the pre-ignition spark plug 3.
Specifically, because the volume of the precombustion chamber 32 is small, and the temperature in the precombustion chamber 32 is high under the heating of the first heating device, the mixed gas enters the engine cylinder body after being heated by the second heating device, and then enters the precombustion chamber 32 through the spray hole 33 on the precombustion shell 31, so that the mixed gas in the precombustion chamber 32 can be ignited quickly and efficiently through the ignition of the precombustion spark plug 3, the ignited mixed gas in the precombustion chamber 32 is sprayed into the engine cylinder body 1 through the spray hole 33 to ignite the mixed gas in the engine cylinder body 1, the phenomenon of difficult engine cold start can be effectively improved, and the energy consumption during the engine cold start can be effectively reduced.
S500, judging whether the engine is started or not according to the engine speed.
The specific steps for judging whether the engine is started or not according to the engine speed comprise:
and judging whether the engine rotating speed is larger than the set rotating speed.
If the engine speed is greater than the set speed, the engine is started. Steps S600 and S700 are sequentially performed.
If the engine speed is equal to or less than the set speed, the engine is not started. Step S200 is executed back until the engine is started.
Specifically, in the present embodiment, the rotation speed is set to zero. When the engine speed is greater than zero, it indicates that the engine is started.
And S600, stopping ignition after the pre-ignition spark plug 3 operates for a second set time period.
Wherein the second set time period is an empirical value obtained by a plurality of tests in the early stage.
Specifically, the second setting time is 7 seconds or longer. Preferably, in the present embodiment, the second set period is equal to 10 seconds.
And S700, igniting the main spark plug 2.
Specifically, after the pre-ignition spark plug 3 operates for a second set period, ignition is stopped, and then the main spark plug 2 is used for ignition, so that the operation of the engine can reach a stable state after the pre-ignition spark plug 3 operates for the second set period, and at the moment, the main spark plug 2 is used for normal ignition, so that the operation stability of the engine can be effectively improved.
Therefore, the engine ignition device for the methanol fuel vehicle is controlled by the starting method of the methanol fuel vehicle, the phenomenon of difficult cold start of the engine can be effectively improved, the energy consumption during cold start of the engine can be effectively reduced, and the running stability of the engine can be effectively improved.
S800, starting the engine.
And S900, igniting the main spark plug 2. It will be appreciated that when the ambient temperature is greater than the set temperature, the engine is started normally, so it is sufficient to fire directly through the main spark plug 2.
With the continuous accumulation of the service life of the main spark plug 2, carbon is easily deposited and coked near the electrode of the main spark plug 2, which may cause the main spark plug 2 to malfunction and cause ignition failure, as shown in fig. 5, the method for starting the methanol fuel vehicle further includes the following steps after steps S700 and S900:
s1000, judging whether the engine speed and the engine torque are normal or not.
If the engine speed and the engine torque are normal, the engine is operated normally, and step S1100 is performed.
If there is an abnormality in one of the engine speed and the engine torque, step S1200 is performed.
Specifically, the specific steps of determining the engine speed and the engine torque include:
it is determined whether the engine speed increases and the engine torque increases after ignition of the main ignition plug 2.
If the engine speed increases, the engine speed is normal.
If the engine torque increases, the engine torque is normal.
It can be understood that the engine speed and the engine torque are both indicative of the cylinder pressure in the engine block 1, and whether the cylinder pressure in the engine block 1 is normal can be effectively determined by determining whether the engine speed and the engine torque are normal.
Specifically, when the main ignition plug 2 is ignited, the engine speed and the engine torque are both increased, the engine is normally operated, the main ignition plug 2 can be normally ignited, and the cylinder pressure in the engine block 1 is normal; if there is no increase in one of the engine speed and the engine torque, the engine is not operated normally, which indicates that the ignition of the main ignition plug 2 is abnormal, and the cylinder pressure in the engine block 1 is abnormal, that is, the cylinder pressure in the engine block 1 does not reach the desired value.
S1200, the pre-ignition spark plug 3 operates, and outputs a "main spark plug ignition abnormality" signal.
It will be appreciated that the pre-ignition spark plug chamber 3 acts as a backup spark plug, and after failure of the primary spark plug 2, ignition is provided by the pre-ignition spark plug 3 so that the engine can continue to operate, thereby enhancing the operational reliability of the engine. And secondly, a main spark plug ignition abnormality signal is output, so that a driver can conveniently maintain or replace the main spark plug 2 in time according to the signal prompt.
S1100, the main spark plug 2 operates, and outputs a signal of 'normal ignition of the main spark plug'.
The invention also provides a methanol fuel vehicle, which comprises the engine ignition device for the methanol fuel vehicle. By controlling the engine ignition device for the methanol fuel vehicle to start the vehicle through the methanol fuel vehicle starting method, the phenomenon of difficult cold start of the engine can be effectively improved, the energy consumption during cold start of the engine can be effectively reduced, and the running stability of the engine can be effectively improved.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (14)
1. The method for starting the methanol fuel vehicle is characterized in that the engine ignition device for the methanol fuel vehicle comprises an engine cylinder body (1), a main spark plug (2) and a pre-ignition spark plug (3) which are arranged on the engine cylinder body (1), wherein the pre-ignition spark plug (3) comprises a pre-ignition shell (31) and a first heating device which is arranged on the pre-ignition shell (31), the first heating device is used for heating a pre-combustion chamber (32) of the pre-ignition shell (31), a plurality of spray holes (33) are uniformly arranged at the bottom of the pre-ignition shell (31) along the circumferential direction at intervals, and the engine ignition device for the methanol fuel vehicle further comprises a second heating device which is arranged at a communication position of an air inlet manifold and the air inlet manifold and is used for heating gas in the air inlet manifold;
the mixture flowing into the engine block (1) can enter the precombustion chamber (32) through the spray holes (33) on the precombustion shell (31);
the starting method of the methanol fuel vehicle comprises the following steps:
s100, judging whether the engine is started in a cold mode according to the ambient temperature; wherein, the engine start comprises cold start and normal start;
if the engine is started in a cold state, executing step S200;
s200, starting a first heating device; activating the second heating device;
s300, after a first set period of time, closing the first heating device and the second heating device, and starting an engine;
s400, igniting the pre-ignition spark plug (3);
s500, judging whether the engine is started or not according to the rotation speed of the engine;
if the engine is started, sequentially executing steps S600 and S700;
if the engine is not started, returning to the step S200 until the engine is started;
s600, stopping ignition after the pre-ignition spark plug (3) operates for a second set time period;
and S700, igniting the main spark plug (2).
2. The method for starting the methanol fuel vehicle according to claim 1, characterized in that the first heating device comprises a resistance wire (4), the resistance wire (4) is integrally formed in the precombustion housing (31), and an insulating layer is arranged on the outer peripheral surface of the resistance wire (4).
3. The method of starting a methanol fuel vehicle according to claim 2, characterized in that the resistance wire (4) is helically coiled inside the pre-combustion housing (31).
4. The method for starting a methanol fuel vehicle according to claim 1, characterized in that the engine block (1) is provided with two intake valves (11) and two exhaust valves (12), the two intake valves (11) and the two exhaust valves (12) being spaced apart along a first direction, the two intake valves (11) being spaced apart along a second direction, the two exhaust valves (12) being also spaced apart along the second direction, the first direction and the second direction being perpendicular to each other and to the height direction of the engine block (1);
the pre-combustion spark plugs (3) and the main spark plugs (2) are distributed at intervals along the first direction, the pre-combustion spark plugs (3) and the main spark plugs (2) are distributed on a first symmetrical axis (13) of the section of the engine cylinder body (1), the pre-combustion spark plugs (3) are close to the intake valve (11) side relative to the main spark plugs (2), and the first symmetrical axis (13) is parallel to the first direction.
5. The method of starting a methanol fuel vehicle according to claim 4, characterized in that the distance between the pre-ignition spark plug (3) and the second symmetry axis (14) of the engine block (1) cross-section ranges from L1, the distance between the main spark plug (2) and the second symmetry axis (14) of the engine block (1) cross-section ranges from L2, L1 < L2, the second symmetry axis (14) being parallel to the second direction.
6. A method of starting a methanol fuel vehicle according to claim 1, characterized in that the volume of the prechamber (32) ranges from 1000mm 3 ～1500mm 3 。
7. The methanol fuel vehicle starting method according to claim 1, characterized in that the aperture of the nozzle hole (33) ranges from 1.2mm to 2mm; the range of the spiral angle of the spray hole (33) is 0-5 degrees.
8. The method for starting a methanol fuel vehicle as claimed in claim 1, wherein the specific step of determining whether the engine is cold started according to the ambient temperature comprises:
judging whether the ambient temperature is less than or equal to a set temperature;
if the ambient temperature is less than or equal to the set temperature, the engine is started in a cold mode;
and if the ambient temperature is higher than the set temperature, the engine is started normally when the engine is started.
9. The methanol fuelled vehicle launch method of claim 8 wherein the set temperature is 16 ℃.
10. The methanol fuel vehicle starting method as recited in claim 1, wherein the first set time period is 5 seconds or longer.
11. The methanol fuel vehicle starting method as recited in claim 1, wherein the second set time period is 7 seconds or longer.
12. The method for starting a methanol fuel vehicle as claimed in claim 1, wherein,
if the engine is started normally, executing step S800;
s800, starting the engine;
s900, the main spark plug (2) is ignited.
13. The methanol fuel vehicle starting method as recited in claim 12, further comprising the steps of, after both step S700 and step S900:
s1000, judging whether the engine speed and the engine torque are normal or not;
if the engine speed and the engine torque are normal, the engine is operated normally, and step S1100 is executed;
if there is an abnormality in one of the engine speed and the engine torque, step S1200 is performed;
s1100, the main spark plug (2) operates and outputs a signal of normal ignition of the main spark plug;
s1200, the pre-ignition spark plug (3) operates, and a main spark plug ignition abnormality signal is output.
14. The methanol fuelled vehicle starting method as claimed in claim 13, wherein the specific step of determining whether the engine speed and the engine torque are normal comprises:
judging whether the engine speed is increased or not and whether the engine torque is increased or not after the ignition of the main spark plug (2);
if the engine speed is increased, the engine speed is normal;
if the engine torque increases, the engine torque is normal.
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| JP4195672B2 (en) * | 2004-03-23 | 2008-12-10 | 三菱重工業株式会社 | Sub-chamber internal combustion engine equipped with a high-frequency heating device |
| US8882863B2 (en) * | 2008-05-14 | 2014-11-11 | Alliant Techsystems Inc. | Fuel reformulation systems |
| US9828905B2 (en) * | 2015-01-02 | 2017-11-28 | Caterpillar Inc. | Combustion pre-chamber and method for operating same |
| CN111894726A (en) * | 2020-08-11 | 2020-11-06 | 天津大学 | Diesel engine cold start jet flame assisted ignition device and control method thereof |
| CN112502823B (en) * | 2020-11-27 | 2022-02-01 | 奇瑞汽车股份有限公司 | Dual-fuel active precombustion chamber engine and automobile |
| CN114992004A (en) * | 2022-05-25 | 2022-09-02 | 哈尔滨工程大学 | Ammonia-hydrogen fuel cold start system, engine, automobile and cold start method |
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