CN111720249A - Phase judging method and phase judging device of electronic fuel injection system of universal small gasoline engine - Google Patents
Phase judging method and phase judging device of electronic fuel injection system of universal small gasoline engine Download PDFInfo
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- CN111720249A CN111720249A CN201910209636.XA CN201910209636A CN111720249A CN 111720249 A CN111720249 A CN 111720249A CN 201910209636 A CN201910209636 A CN 201910209636A CN 111720249 A CN111720249 A CN 111720249A
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- engine
- phase
- injection system
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- small gasoline
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
- F02M65/005—Measuring or detecting injection-valve lift, e.g. to determine injection timing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
A phase judging method and a phase judging device of an electronic injection system of a general small gasoline engine comprise the following steps: after the engine is started and the rotating speed is stabilized at a set value, starting to judge the phase; controlling ignition by an ECU and carrying out phase judgment; if the engine meets the stable operation condition, the phase judgment is successful, the ignition of the engine in the normal working compression stroke is judged, and the engine enters the normal working; and if the rotating speed of the engine continuously decreases and meets the set decreasing rotating speed condition, judging that the engine is ignited in the exhaust stroke of abnormal work, returning to the phase judgment again after the ignition is controlled by the ECU and the ignition phase is automatically switched until the phase judgment is successful. The invention also provides a phase judging device adopting the phase judging method of the electronic injection system of the universal small gasoline engine. The invention can effectively avoid misjudgment, has small rotation speed fluctuation in the phase judgment process, cannot cause rapid change of the rotation speed, and effectively reduces the cost of an electronic injection system.
Description
Technical Field
The invention relates to an electronic fuel injection system of a small engine, in particular to a phase judging method and a phase judging device of an electronic fuel injection system of a general small gasoline engine.
Background
Referring to fig. 1, fig. 1 is a schematic diagram of a phase determination device of a prior art engine. Phase recognition of a four-stroke engine refers to the ECU (electronic control unit) distinguishing the intake stroke from the power stroke, the compression stroke from the exhaust stroke of the engine. As shown in fig. 1, the phase determining device of the prior art includes a plurality of sensors, such as a camshaft position sensor 1, an intake pressure sensor 3, a throttle position sensor 4, a crankshaft position and rotation speed sensor 5, etc., to perform position and speed detection, the phase determination of the engine electronic fuel injection system is performed by the aid of the intake pressure sensor 3, and the phase determination of the multi-cylinder engine is performed by the camshaft position sensor 1. When the single-cylinder engine inhales, air pressure changes to form negative pressure, and an ECU (electronic control unit) 7 can acquire data of the air inlet pressure sensor 3 to obtain the position of the air pressure change, wherein the position of the air pressure change is the air suction stroke of the engine. The multi-cylinder engine is provided with a camshaft position sensor 1, when a camshaft passes through the camshaft position sensor 1, a pulse signal is sent to an ECU (electronic control unit) 7, and the ECU (electronic control unit) 7 can know whether the current stroke is a compression stroke or an exhaust stroke through the pulse. However, in the method of the prior art, before phase discrimination success is not achieved, the igniter 6 is ignited in the compression stroke and the exhaust stroke, the fuel injector 2 is used for injecting once per circle, half of the fuel is injected each time, so that the fuel injection angle cannot be accurately controlled, and energy for ignition in the exhaust stroke is wasted.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a phase judging method and a phase judging device of an electronic fuel injection system of a general small gasoline engine.
In order to achieve the purpose, the invention provides a phase judging method of an electronic injection system of a universal small gasoline engine, which comprises the following steps:
s100, after the engine is started, when the rotating speed is stabilized at a set value, phase judgment is started;
s200, controlling ignition by an ECU and carrying out phase judgment;
s300, if the engine meets the stable operation condition, the phase judgment is successful, the ignition of the engine in the normal working compression stroke is judged, and the engine enters the normal working; and
s400, if the rotating speed of the engine continuously decreases and meets the set decreasing rotating speed condition, judging that the engine is ignited in the exhaust stroke of abnormal work, returning to the step S200, automatically switching ignition phases, and then judging the phases again until the phase judgment is successful.
In the phase judging method of the electronic fuel injection system of the general small gasoline engine, in step S200, the ECU controls the engine to ignite once every two revolutions.
In the phase determining method of the electronic fuel injection system of the general small gasoline engine, in step S200, the ECU controls the ignition advance angle of one stroke of the engine to be positive, and the ignition advance angle of the other stroke of the engine to be reduced or the ignition advance angle to be negative.
In the phase judging method of the electronic fuel injection system of the universal small gasoline engine, in the step S100, the set value is the target rotating speed of the engine +/-10-1000 r/min.
In the phase judging method of the electronic fuel injection system of the universal small gasoline engine, in step S300, the stable operation condition is that the engine continuously and stably operates for 4-6000 circles.
In the phase judging method of the electronic fuel injection system of the general small gasoline engine, in step S400, the set reduction rotation speed condition is that the rotation speed of the engine continuously decreases every circle and exceeds the set reduction rotation speed by 10 to 900 r/min.
In order to better achieve the purpose, the invention further provides a phase judging device of the electronic injection system of the universal small gasoline engine, wherein the phase judging device comprises an ECU, an igniter and an oil injector, the igniter and the oil injector are respectively connected with the ECU and the engine, and the phase judging method of the electronic injection system of the universal small gasoline engine is adopted to judge the phase of the engine.
The invention has the technical effects that:
according to the invention, after the engine is started, under the condition that the rotating speed is stable, ignition is performed once in two circles, under the condition that the compression stroke and the exhaust stroke are unknown, the ignition can be performed in the compression stroke, the rotating speed can still be kept stable at the moment, if the ignition is performed in the exhaust stroke, the engine loses power at the moment, the rotating speed is continuously reduced in each circle, and thus whether the current ignition is performed in the compression stroke or the exhaust stroke can be identified. According to the invention, under the condition that the engine electronic injection system does not use an air inlet pressure sensor and cam position sensing, the phase judgment of the engine can be rapidly completed, the misjudgment can be effectively avoided, meanwhile, the rotation speed fluctuation is small in the phase judgment process, the rapid change of the rotation speed can not be caused, and the cost of the electronic injection system is effectively reduced under the condition of improving the user experience. The method is simple and convenient, easy to realize, and stable and reliable in judgment result.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
FIG. 1 is a schematic diagram of a prior art engine phase determination device;
FIG. 2 is a flowchart of a phase determination method according to an embodiment of the present invention;
fig. 3 is a flowchart of a phase determination method according to another embodiment of the present invention.
Wherein the reference numerals
1 camshaft position sensor
2 oil sprayer
3 air inlet pressure sensor
4 throttle position sensor
5 crankshaft position and rotating speed sensor
6 igniter
7 ECU
Detailed Description
The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:
referring to fig. 2, fig. 2 is a flowchart of a phase determination method according to an embodiment of the invention. The invention discloses a phase judging method of an electronic injection system of a universal small gasoline engine, which comprises the following steps:
step S100, after the engine is started, when the rotating speed is stabilized at a set value, phase judgment is started, wherein the set value is preferably the target rotating speed +/-10-1000 r/min of the engine;
s200, controlling ignition by an ECU and judging phases, wherein the ECU controls the ignition once every two revolutions of the engine; or referring to fig. 3, the ECU controls the ignition advance angle of one stroke of the engine to be positive, and the ignition advance angle of the other stroke of the engine to be reduced or the ignition advance angle to be negative;
step S300, if the engine meets a stable operation condition, judging that the phase is successful, judging that the engine is ignited in a compression stroke of normal work, and enabling the engine to enter the normal work, wherein the stable operation condition is preferably that the engine continuously and stably operates for 4-6000 circles; and
and S400, if the rotating speed of the engine continuously decreases and meets a set decreasing rotating speed condition, judging that the engine ignites in an exhaust stroke in abnormal work, returning to the step S200, automatically switching ignition phases, and then re-judging the phases until the phases are successfully judged, wherein the set decreasing rotating speed condition is preferably that the rotating speed of the engine continuously decreases every circle and exceeds the set decreasing rotating speed by 10-900 r/min.
The invention also provides a phase judging device of the electronic injection system of the universal small gasoline engine, which comprises an ECU, an igniter and an oil injector, wherein the igniter and the oil injector are respectively connected with the ECU and the engine, and the phase judging device adopts the phase judging method of the electronic injection system of the universal small gasoline engine to judge the phase of the engine. The engine may ignite in either the compression stroke or the exhaust stroke. If the ignition is performed in the compression stroke, the rotation speed is still kept stable at this time. If the ignition is performed in the exhaust stroke, the engine loses power at the moment, the rotating speed is continuously reduced every circle, and therefore whether the current ignition is performed in the compression stroke or the exhaust stroke can be identified. The composition, structure, connection relationship and operation principle of other parts of the phase determination device are mature prior art, and therefore are not described herein again.
The invention combines the characteristic that most of the universal engines are constant and auxiliary rotating speeds, and the phase judging method adopted on the basis of the characteristic can be applied to various single-cylinder and V-shaped double-cylinder engines. As shown in FIG. 2, when the engine is started and the engine speed is stabilized at a target speed of +/-10-1000 r/min, phase judgment is started, if the ignition is just right in the compression stroke of normal work of the engine, the engine speed is stabilized at the moment and continuously and stably runs for 4-6000 circles, ECU phase judgment is successful, and the engine enters a normal working state. If the ignition point is just at the exhaust stroke of abnormal work of the engine, the engine loses power at this time, the rotating speed of the engine continuously decreases every circle and exceeds the set decreasing rotating speed (10-900) r/min, the ECU controls ignition, the ignition phase is automatically switched, and the phase is judged again until the phase judgment is successful.
Another phase determination method is shown in fig. 3, when the engine is started and the engine speed is stabilized at the target speed ± (10-1000) r/min, phase determination is started, two ignition circles are started once when phase determination is started, ignition is performed only in the compression stroke or the exhaust stroke, and in practice, abnormal combustion of the engine may be caused if misfiring occurs. The invention can also be set to automatically rotate to that the engine rotates one circle to ignite according to the normal ignition advance angle, and the next circle to ignite according to the reduced ignition advance angle, even the negative ignition advance angle, so that the engine loses power when the phase is incorrect. And after phase judgment is started, detecting whether the rotating speed continuously drops, if the normal ignition advance angle ignition is just in the compression stroke of normal work of the engine, at the moment, the rotating speed of the engine is stable and continuously and stably runs for 4-6000 circles, and if the ECU judges that the phase judgment is successful, the engine enters a normal working state. If the ignition advance angle is reduced, even if the ignition advance angle is negative, the ignition advance angle is just right at the exhaust stroke of the engine, at the moment, the rotating speed of the engine continuously decreases every circle, and the continuously decreased rotating speed exceeds a certain rotating speed, for example, the continuously decreased rotating speed exceeds a set decreased rotating speed (10-900) r/min, another phase is switched to restart phase judgment, at the moment, the ECU controls ignition, the ignition phase is automatically switched, and the phase judgment is carried out again until the phase judgment is successful. And if the current rotating speed does not continuously drop to exceed a certain rotating speed and the continuous stable operation exceeds a certain number of turns, the current phase is considered to be correct, and the engine phase judgment is successful.
That is, the present invention ignites once for two revolutions first when the engine is started and the rotational speed is stabilized within a certain range without using the intake pressure sensor and the cam position sensor. Ignition may occur during the compression stroke or the exhaust stroke. If the ignition is performed in the compression stroke, the rotation speed is still kept stable at this time. If the ignition is performed in the exhaust stroke, the engine loses power at the moment, the rotating speed is continuously reduced every circle, and therefore whether the current ignition is performed in the compression stroke or the exhaust stroke can be identified.
In which two ignition cycles are initiated once at the beginning of the phase determination and only during the compression or exhaust stroke, in practice, if a misfire occurs, the engine may burn abnormally. The invention can also be set in such a way that the ignition advance angle of one stroke is normal, and the ignition advance angle of the other stroke is reduced, even negative, so that the engine loses power when the phase is incorrect. After the phase judgment is started, whether the rotating speed is continuously reduced or not is detected, and if the continuously reduced rotating speed exceeds a certain rotating speed, another phase is switched to restart the phase judgment; and if the current rotating speed does not continuously drop to exceed a certain rotating speed and the continuous stable operation exceeds a certain number of turns, the current phase is considered to be correct, and the engine phase judgment is successful.
According to the invention, under the condition that the engine electronic injection system does not use an air inlet pressure sensor and cam position sensing, the phase judgment of the engine can be rapidly completed, the misjudgment can be effectively avoided, meanwhile, the rotation speed fluctuation is small in the phase judgment process, the rapid change of the rotation speed can not be caused, and the cost of the electronic injection system is effectively reduced under the condition of improving the user experience.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A phase judging method of an electronic fuel injection system of a general small gasoline engine is characterized by comprising the following steps:
s100, after the engine is started, when the rotating speed is stabilized at a set value, phase judgment is started;
s200, controlling ignition by an ECU and carrying out phase judgment;
s300, if the engine meets the stable operation condition, the phase judgment is successful, the ignition of the engine in the normal working compression stroke is judged, and the engine enters the normal working; and
s400, if the rotating speed of the engine continuously decreases and meets the set decreasing rotating speed condition, judging that the engine is ignited in the exhaust stroke of abnormal work, returning to the step S200, automatically switching ignition phases, and then judging the phases again until the phase judgment is successful.
2. The method for determining the phase of an electronic fuel injection system of a general small gasoline engine as claimed in claim 1, wherein in step S200, the ECU controls the engine to ignite once every two revolutions.
3. The method for determining the phase of an electronic fuel injection system of a general small gasoline engine as claimed in claim 1, wherein in step S200, the ECU controls the ignition advance angle of one stroke of the engine to be positive, the ignition advance angle of the other stroke of the engine to be reduced or the ignition advance angle to be negative.
4. The method for determining the phase of an electronic fuel injection system of a general small gasoline engine as claimed in claim 1, 2 or 3, wherein in step S100, the set value is the target speed of the engine ± 10 to 1000 r/min.
5. The method for determining the phase of an electronic fuel injection system of a general small gasoline engine as claimed in claim 1, 2 or 3, wherein in step S300, the stable operation condition is that the engine continuously and stably operates for 4-6000 revolutions.
6. The method for determining the phase of an electronic fuel injection system of a general small gasoline engine as claimed in claim 4, wherein in step S300, the stable operation condition is that the engine continuously and stably operates for 4-6000 revolutions.
7. The method for determining the phase of an electronic fuel injection system of a general small gasoline engine as claimed in claim 1, 2 or 3, wherein in step S400, the set decreasing speed condition is that the engine speed continuously decreases every circle and exceeds the set decreasing speed by 10-900 r/min.
8. The method for determining the phase of an electronic fuel injection system of a general small gasoline engine as claimed in claim 4, wherein in step S400, the set drop speed condition is that the engine speed continuously drops every circle and exceeds the set drop speed by 10-900 r/min.
9. The method for determining the phase of an electronic fuel injection system of a general small gasoline engine as claimed in claim 5, wherein in step S400, the set drop speed condition is that the engine speed continuously drops every circle and exceeds the set drop speed by 10-900 r/min.
10. The phase judging device of the electronic injection system of the general small gasoline engine is characterized by comprising an ECU, an igniter and an oil injector, wherein the igniter and the oil injector are respectively connected with the ECU and the engine, and the phase of the engine is judged by adopting the phase judging method of the electronic injection system of the general small gasoline engine as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910209636.XA CN111720249A (en) | 2019-03-19 | 2019-03-19 | Phase judging method and phase judging device of electronic fuel injection system of universal small gasoline engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910209636.XA CN111720249A (en) | 2019-03-19 | 2019-03-19 | Phase judging method and phase judging device of electronic fuel injection system of universal small gasoline engine |
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| CN111720249A true CN111720249A (en) | 2020-09-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113294255A (en) * | 2021-05-19 | 2021-08-24 | 奇瑞汽车股份有限公司 | Cylinder judging method of phase-free sensor |
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| CN101701564A (en) * | 2009-11-05 | 2010-05-05 | 江门市蓬江区天迅科技有限公司 | Compression stroke ignition system for four-stroke engine |
| CN107201979A (en) * | 2016-12-26 | 2017-09-26 | 浙江亚特电器有限公司 | A kind of digital ignition control method of mini four-stroke engine |
| CN108730095A (en) * | 2018-06-05 | 2018-11-02 | 星科动力有限公司 | A kind of ignition control method and system of bi-block engine |
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2019
- 2019-03-19 CN CN201910209636.XA patent/CN111720249A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101338722A (en) * | 2007-07-05 | 2009-01-07 | 安德烈亚斯.斯蒂尔两合公司 | Method for running two-stroke engine |
| CN101440769A (en) * | 2008-12-17 | 2009-05-27 | 北京东方智明科技有限公司 | Engine ignition control method |
| CN201363227Y (en) * | 2008-12-17 | 2009-12-16 | 北京东方智明科技有限公司 | Engine ignition control device |
| CN101701564A (en) * | 2009-11-05 | 2010-05-05 | 江门市蓬江区天迅科技有限公司 | Compression stroke ignition system for four-stroke engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113294255A (en) * | 2021-05-19 | 2021-08-24 | 奇瑞汽车股份有限公司 | Cylinder judging method of phase-free sensor |
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Application publication date: 20200929 |