CN117662349A - Engine ignition method, device, medium and ECU - Google Patents
Engine ignition method, device, medium and ECU Download PDFInfo
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- CN117662349A CN117662349A CN202311642375.3A CN202311642375A CN117662349A CN 117662349 A CN117662349 A CN 117662349A CN 202311642375 A CN202311642375 A CN 202311642375A CN 117662349 A CN117662349 A CN 117662349A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 206010044048 Tooth missing Diseases 0.000 claims abstract description 12
- 238000005070 sampling Methods 0.000 claims description 13
- 230000000737 periodic effect Effects 0.000 claims description 4
- 238000012790 confirmation Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 238000010304 firing Methods 0.000 abstract 1
- 238000002347 injection Methods 0.000 description 12
- 239000007924 injection Substances 0.000 description 12
- 239000000243 solution Substances 0.000 description 8
- 239000000446 fuel Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000011217 control strategy Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Ignition Installations For Internal Combustion Engines (AREA)
Abstract
The invention relates to the technical field of engine control, in particular to an engine ignition method, an engine ignition device, a medium and an ECU. In the absence of a camshaft position sensor signal, the present invention can determine the missing tooth position by the crankshaft position sensor, but the firing period is 720, so the missing tooth position may be 0 or 360. And respectively setting an ignition angle and a scheme under two conditions, and performing double ignition on each cylinder in one ignition period until the cylinder judgment is finished to finish the confirmation of the ignition angle, and determining the actual angle of the tooth missing position and then the actual ignition angle. Aiming at the motorcycle engine, only DG can be installed, so that the use cost and the installation space are saved, and the ignition stability of the engine is ensured.
Description
Technical Field
The invention relates to the technical field of engine control, in particular to an engine ignition method, an engine ignition device, a medium and an ECU.
Background
The working principle of the electronic injection ECU is that the fuel injector is controlled to inject fuel after the input of various sensors is calculated by the ECU, and the ignition coil is controlled to charge and discharge near the compression upper stop, and the mixed gas in the cylinder is ignited to drive the engine to rotate positively. And then the vehicle is driven to drive forwards or backwards by engaging a proper gear. Here, the input of the sensor is of vital importance. The most important of the various sensors is a camshaft position sensor (PG) and a crankshaft position sensor (DG), and the signal input of the two sensors determines the positions of fuel injection and ignition of the engine.
In the current domestic automobile market, PG and DG are installed simultaneously to become standard. In the motorcycle market, only a very small number of motorcycle types are provided with two types of sensors at the same time due to the problems of mounting structures and cost, and generally only DGs are mounted. This can create challenges for the control strategy of the electronic injection ECU, especially for three-cylinder engines of asymmetric layout. Firstly, the engine starts to drag the crankshaft from the starter to the electronic injection ECU to identify the correct cylinder sequence and apply the correct ignition fuel injection, and a process is carried out in the middle, wherein the process needs to ensure the starting stability and the starting time of the engine to be within a reasonable range. In order to ensure the starting stability of the engine and to shorten the starting time, an excellent control strategy is required.
Disclosure of Invention
The invention discloses an engine ignition method, an engine ignition device, a medium and an ECU, which can realize engine ignition under the condition of lacking a camshaft position sensor signal.
To achieve the above object, in one aspect, an engine ignition method is provided for igniting a four-stroke engine in the absence of a camshaft position sensor signal, which specifically includes:
starting the engine, and marking the rotation angle of the crankshaft corresponding to the tooth missing position as a possible reference angle when the tooth missing position is detected by the crankshaft position sensor;
the method comprises the steps that the engine is double-ignited under the assumption that a possible reference angle is 0 DEG or 360 DEG respectively;
judging the cylinder of the engine until the cylinder judgment is successful;
and after the cylinder judgment is successful, taking the angle corresponding to the possible reference angle when the cylinder judgment is successful as an actual reference angle, taking the rotation angle of the ignition crankshaft of the cylinder corresponding to the actual reference angle as the reference, and sequentially igniting each cylinder in each crankshaft rotation period.
An advantage of this embodiment is that in the absence of a camshaft position sensor signal, the missing tooth position can be determined by the crankshaft position sensor, but the ignition period is 720 °, so the missing tooth position may be 0 ° or 360 °. Setting up ignition angle and scheme respectively under two conditions, carrying out double ignition on each cylinder in one ignition period until the cylinder judgment is finished to finish the confirmation of the ignition angle, determining the actual angle of the tooth missing position, and further determining the ignition scheme.
Optionally, the engine is single cylinder, double cylinder, three cylinder or four cylinder.
Further, it is assumed that the possible reference angles are 0 ° or 360 ° respectively, and the specific method is as follows:
assuming that the possible reference angle is 0 degree, acquiring the number of cylinders of the engine and the software reference point angle of a first cylinder, calculating the corresponding crankshaft rotation angle when each cylinder ignites, and recording and generating a first ignition scheme;
assuming that the possible reference angle is 360 degrees, acquiring the number of cylinders of the engine and the software reference point angle of the first cylinder, calculating the corresponding crankshaft rotation angle when each cylinder ignites, and recording to generate a second ignition scheme;
when the crankshaft rotates to the ignition angles recorded by the first ignition scheme and the second ignition scheme, the corresponding cylinders are ignited.
Further, assuming that the possible reference angle is 0 °, a first ignition scheme is generated, the specific method is as follows:
marking the software reference point angle of the first cylinder as the corresponding crankshaft rotation angle when the first cylinder ignites, wherein every other fixed angle is the corresponding crankshaft rotation angle when the subsequent cylinder ignites on the basis of the corresponding crankshaft rotation angle when the first cylinder ignites, and repeating cycle ignition until all cylinders are sequentially ignited within a cycle of 720 degrees;
the fixed angle is equal to 720 ° divided by the number of cylinders.
Further, assuming that the possible reference angle is 360 °, a second ignition scheme is generated, the specific method is as follows:
dividing 720 degrees by the number of cylinders to obtain a fixed angle;
after the software reference point angle of the first cylinder, sequentially marking the ignition angle of the subsequent cylinder at fixed angles at intervals;
selecting a cylinder corresponding to the last ignition angle after 360 degrees to perform first ignition;
and sequentially igniting the subsequent cylinders at the subsequent ignition angle until all the subsequent cylinders are sequentially ignited within one period of 720 degrees, and repeating the periodic ignition.
Further, after the cylinder judgment is successful, the ignition scheme corresponding to the successful ignition is determined, and the other ignition scheme is deleted, so that the ignition scheme corresponding to the successful ignition is determined to continuously ignite the engine.
Further, the cylinder judgment method for the engine comprises the following steps:
the pressure sensor is arranged at a certain cylinder position, a first sampling angle and a second sampling angle are respectively set on the rotation stroke of the crankshaft, and the stroke position of the cylinder is judged by comparing the air inlet pressure value of the cylinder when the crankshaft is at the first sampling angle and the second sampling angle.
In order to achieve the above object, another aspect of the present embodiment provides an engine ignition device, including a possible reference calibration module, a test ignition module, a cylinder judgment module, and a calibration reference ignition module;
the possible reference calibration module starts the engine, and marks the crankshaft rotation angle corresponding to the tooth missing position as a possible reference angle when the crankshaft position sensor detects the tooth missing position;
the test ignition module respectively performs double ignition on the engine under the assumption that the possible reference angle is 0 DEG or 360 DEG;
the cylinder judging module judges the cylinder of the engine until the cylinder judgment is successful;
and the calibration reference ignition module is used for sequentially igniting each cylinder in each crankshaft rotation period by taking an angle corresponding to a possible reference angle as an actual reference angle and taking a cylinder ignition crankshaft rotation angle corresponding to the actual reference angle as a reference after the cylinder judgment is successful.
In order to achieve the above object, in another aspect, the present embodiment provides a storage medium storing a plurality of instructions, and a processor loads the plurality of instructions to perform the engine ignition method.
In order to achieve the above object, in another aspect, the present embodiment provides an ECU including the engine ignition device described above, and/or the storage medium described above.
It should be noted that, the terms "first", "second", and the like are used herein merely to describe each component in the technical solution, and do not constitute a limitation on the technical solution, and are not to be construed as indicating or implying importance of the corresponding component; elements with "first", "second" and the like mean that in the corresponding technical solution, the element includes at least one.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the technical effects, technical features and objects of the present invention will be further understood, and the present invention will be described in detail below with reference to the accompanying drawings, which form a necessary part of the specification, and together with the embodiments of the present invention serve to illustrate the technical solution of the present invention, but not to limit the present invention.
Like reference numerals in the drawings denote like parts, in particular:
fig. 1 is a schematic diagram of the first synchronization of the rotational angle of the corresponding crankshaft in embodiment 2.
Fig. 2 is a schematic diagram of the ignition angle corresponding to the rotation angle of the crankshaft in embodiment 2.
Fig. 3 is a schematic diagram of the cylinder judgment in embodiment 2.
Fig. 4 is a schematic diagram of the ignition flow of the three-cylinder engine in embodiment 2.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. Of course, the following specific examples are set forth only to illustrate the technical solution of the present invention, and are not intended to limit the present invention. Furthermore, the parts expressed in the examples or drawings are merely illustrative of the relevant parts of the present invention, and not all of the present invention.
As shown in figure 1 of the drawings,
an engine ignition method for igniting a four-stroke engine in the absence of a camshaft position sensor signal, comprising the steps of:
s1, starting the engine, and marking the crankshaft rotation angle corresponding to the tooth missing position as a possible reference angle when the crankshaft position sensor detects the tooth missing position.
And S2, respectively, assuming that the possible reference angle is 0 DEG or 360 DEG, and igniting the engine.
Specifically, it is assumed that the possible reference angles are 0 ° or 360 ° respectively, and ignition is performed respectively, and the specific method is as follows:
s21, assuming that a possible reference angle is 0 degree, acquiring the number of engine cylinders and a software reference point angle of a first cylinder, calculating a corresponding crankshaft rotation angle when each cylinder ignites, and recording and generating a first ignition scheme.
Specifically, when a first ignition scheme is generated under the condition that a possible reference angle is 0 ℃, marking a software reference point angle of a first cylinder as a corresponding crankshaft rotation angle when the first cylinder ignites, wherein every other fixed angle is respectively a corresponding crankshaft rotation angle when a subsequent cylinder ignites on the basis of the corresponding crankshaft rotation angle when the first cylinder ignites, and repeating periodic ignition until all cylinders are sequentially ignited within one period 720 ℃; the fixed angle is equal to 720 ° divided by the number of cylinders.
S22, assuming that a possible reference angle is 360 degrees, acquiring the number of engine cylinders and a software reference point angle of a first cylinder, calculating a corresponding crankshaft rotation angle when each cylinder ignites, and recording and generating a second ignition scheme.
Specifically, assuming that the possible reference angle is 360 ° when the second ignition scheme is generated, a fixed angle is calculated by dividing 720 ° by the cylinder number; after the software reference point angle of the first cylinder, sequentially marking the ignition angle of the subsequent cylinder at fixed angles at intervals; selecting a cylinder corresponding to the last ignition angle after 360 degrees to perform first ignition; and sequentially igniting the subsequent cylinders at the subsequent ignition angle until all the subsequent cylinders are sequentially ignited within one period of 720 degrees, and repeating the periodic ignition.
And S23, when the crankshaft rotates to the ignition angles recorded by the first ignition scheme and the second ignition scheme, the corresponding cylinders are ignited.
S3, judging the cylinder of the engine until the cylinder judgment is successful.
Specifically, the cylinder judgment method for the engine comprises the following steps: the pressure sensor is arranged at a certain cylinder position, a first sampling angle and a second sampling angle are respectively set on the rotation stroke of the crankshaft, and the stroke position of the cylinder is judged by comparing the air inlet pressure value of the cylinder when the crankshaft is at the first sampling angle and the second sampling angle.
And S4, after the cylinder judgment is successful, taking the angle corresponding to the possible reference angle when the cylinder judgment is successful as an actual reference angle, taking the rotation angle of the ignition crankshaft of the cylinder corresponding to the actual reference angle as the reference, and sequentially igniting each cylinder in each crankshaft rotation period.
Specifically, after the cylinder judgment is successful, the ignition scheme corresponding to the successful ignition is determined, and the other set of ignition scheme is deleted to determine that the ignition scheme corresponding to the successful ignition is continuously ignited for the engine.
Example 2:
the ignition method of the three-cylinder engine comprises the following specific steps:
s1, starting an engine, wherein each cylinder consists of four strokes, namely an air inlet stroke, a compression stroke, a working stroke and an exhaust stroke, and each stroke corresponds to a 180-degree rotation angle of a crankshaft. Each rotation of the crankshaft is 360 degrees, and each two circles are a complete working cycle. This results in a complete working cycle, i.e. 720 ° crank angle.
S2, when the starter drags the crankshaft to operate forwards, DG starts to identify tooth signals. As shown in FIG. 1, when the system first identifies a missing tooth position at point S0, then the engine position identification is considered successful and the position is calibrated. Because of the two crank angles being one duty cycle, and because of the absence of PG, the system is not able to determine this position as 0 or 360. According to the angle relation between the installation position of DG and the compression stroke top dead center of the first cylinder, according to the number of cylinders of the three-cylinder engine being 3 and the ignition interval of the straight-line 3-cylinder engine being 240 degrees, dividing 720 degrees into 3 calculation points, such as S0, S1 and S2 in the figure 1, which are 24-2-tooth three-cylinder engines in the figure, when the signal input of DG passes through S0, triggering the program to execute once, and setting the angle S1=S0+240 degrees of the next program execution; when the signal input of DG passes through S1, the program is triggered to execute once, and the angle s2=s1+240° of the next program execution is set; when the signal input of DG passes through S2, the program is triggered to execute once, and the angle s0=s2+240° of the next program execution is set; and so on.
S3, before judging the cylinders, in order to avoid starting failure caused by 360 degrees of dislocation of ignition positions of the cylinders, mirror image ignition is needed by taking two missing teeth as references. As shown in fig. 2, ign1, ign2, and ign3 are ignition positions set based on BM0, which are 105 °, 345 °, 585 °, respectively; the ign1 double, ign2 double, and ign3 double are ignition positions set based on BM1, respectively 465 °, 705 °, 225 °. The position of the oil injection in the starting stage has less influence on starting, and the oil injection can be carried out in a single injection mode every 720 degrees according to the reference of BM0, as shown in figure 2, and in 1, in 2 and in 3.
S4, as shown in fig. 3, the first cylinder pressure sensors set a sampling angle PS1 and PS2 based on BM0 and BM1, respectively.
S5, comparing the intake pressure values sampled by the two reference points to obtain BM0 or BM1 as a real reference point 0 degrees.
S6, if the reference point 0 degree is BM0, the currently executed oil injection ignition position is considered to be unnecessary to switch, the arrangement of ign1 double, ign2 double and ign3 double is closed at the moment S1, the next calculation point S2=S1+240 degree is arranged at the moment S1, and the system is prompted that the current system has successfully judges the cylinder; if the reference point 0 DEG is BM1, the currently executed fuel injection ignition position is considered to need to be switched.
Setting a next calculation point s2=s1+120° at the time of S1; when the S2 angle is generated, S2 is set as a new S0, and the ign1 double, the ign2 double and the ign3 double are closed, and the injection angles inj1, inj2 and inj3 are adjusted to be injected based on the new S0. And prompts the system that the current system has judged that the cylinder is successful.
And S7, after the cylinder judgment is completed, the system calculates 240-degree intervals according to the new reference angle, and performs oil injection ignition on each cylinder.
It should be noted that the foregoing examples are merely for clearly illustrating the technical solution of the present invention, and those skilled in the art will understand that the embodiments of the present invention are not limited to the foregoing, and that obvious changes, substitutions or alterations can be made based on the foregoing without departing from the scope covered by the technical solution of the present invention; other embodiments will fall within the scope of the invention without departing from the inventive concept.
Claims (10)
1. An engine ignition method, characterized by igniting a four-stroke engine in the absence of a camshaft position sensor signal, comprising:
starting the engine, and marking the rotation angle of the crankshaft corresponding to the tooth missing position as a possible reference angle when the tooth missing position is detected by the crankshaft position sensor;
the method comprises the steps that the engine is double-ignited under the assumption that a possible reference angle is 0 DEG or 360 DEG respectively;
judging the cylinder of the engine until the cylinder judgment is successful;
and after the cylinder judgment is successful, taking the angle corresponding to the possible reference angle when the cylinder judgment is successful as an actual reference angle, taking the rotation angle of the ignition crankshaft of the cylinder corresponding to the actual reference angle as the reference, and sequentially igniting each cylinder in each crankshaft rotation period.
2. The engine ignition method of claim 1, wherein the engine is single cylinder, double cylinder, three cylinder or four cylinder.
3. The engine ignition method according to claim 1, characterized in that ignition is performed assuming that the possible reference angle is 0 ° or 360 ° respectively, by the following method:
assuming that the possible reference angle is 0 degree, acquiring the number of cylinders of the engine and the software reference point angle of a first cylinder, calculating the corresponding crankshaft rotation angle when each cylinder ignites, and recording and generating a first ignition scheme;
assuming that the possible reference angle is 360 degrees, acquiring the number of cylinders of the engine and the software reference point angle of the first cylinder, calculating the corresponding crankshaft rotation angle when each cylinder ignites, and recording to generate a second ignition scheme;
when the crankshaft rotates to the ignition angles recorded by the first ignition scheme and the second ignition scheme, the corresponding cylinders are ignited.
4. An engine ignition method according to claim 3, characterized in that the first ignition scheme is generated assuming a possible reference angle of 0 °, in particular as follows:
marking the software reference point angle of the first cylinder as the corresponding crankshaft rotation angle when the first cylinder ignites, wherein every other fixed angle is the corresponding crankshaft rotation angle when the subsequent cylinder ignites on the basis of the corresponding crankshaft rotation angle when the first cylinder ignites, and repeating cycle ignition until all cylinders are sequentially ignited within a cycle of 720 degrees;
the fixed angle is equal to 720 ° divided by the number of cylinders.
5. An engine ignition method according to claim 3, characterized in that the second ignition scheme is generated assuming a possible reference angle of 360 °, in particular as follows:
dividing 720 degrees by the number of cylinders to obtain a fixed angle;
after the software reference point angle of the first cylinder, sequentially marking the ignition angle of the subsequent cylinder at fixed angles at intervals;
selecting a cylinder corresponding to the last ignition angle after 360 degrees to perform first ignition;
and sequentially igniting the subsequent cylinders at the subsequent ignition angle until all the subsequent cylinders are sequentially ignited within one period of 720 degrees, and repeating the periodic ignition.
6. An engine ignition method according to claim 3, wherein after the cylinder determination is successful, an ignition scheme corresponding to the successful ignition is determined, and another set of ignition schemes is deleted to determine that the ignition scheme corresponding to the successful ignition is continued to ignite the engine.
7. The engine ignition method of claim 1, characterized in that the engine cylinder judgment is performed by the following steps:
the pressure sensor is arranged at a certain cylinder position, a first sampling angle and a second sampling angle are respectively set on the rotation stroke of the crankshaft, and the stroke position of the cylinder is judged by comparing the air inlet pressure value of the cylinder when the crankshaft is at the first sampling angle and the second sampling angle.
8. The engine ignition device is characterized by comprising a possible reference calibration module, a test ignition module, a cylinder judgment module and a calibration reference ignition module;
the possible reference calibration module starts the engine, and marks the crankshaft rotation angle corresponding to the tooth missing position as a possible reference angle when the crankshaft position sensor detects the tooth missing position;
the test ignition module respectively performs double ignition on the engine under the assumption that the possible reference angle is 0 DEG or 360 DEG;
the cylinder judging module judges the cylinder of the engine until the cylinder judgment is successful;
and the calibration reference ignition module is used for sequentially igniting each cylinder in each crankshaft rotation period by taking an angle corresponding to a possible reference angle as an actual reference angle and taking a cylinder ignition crankshaft rotation angle corresponding to the actual reference angle as a reference after the cylinder judgment is successful.
9. A storage medium having stored thereon instructions which are loaded by a processor to perform the engine ignition method of any one of claims 1 to 7.
10. An ECU comprising the engine ignition device according to claim 8, and/or the storage medium according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311642375.3A CN117662349A (en) | 2023-12-04 | 2023-12-04 | Engine ignition method, device, medium and ECU |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311642375.3A CN117662349A (en) | 2023-12-04 | 2023-12-04 | Engine ignition method, device, medium and ECU |
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| Publication Number | Publication Date |
|---|---|
| CN117662349A true CN117662349A (en) | 2024-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311642375.3A Pending CN117662349A (en) | 2023-12-04 | 2023-12-04 | Engine ignition method, device, medium and ECU |
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|---|---|
| CN (1) | CN117662349A (en) |
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- 2023-12-04 CN CN202311642375.3A patent/CN117662349A/en active Pending
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