CN115142972A - Control method, device and system for out-of-control pre-ignition of engine - Google Patents
Control method, device and system for out-of-control pre-ignition of engine Download PDFInfo
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- CN115142972A CN115142972A CN202110338262.9A CN202110338262A CN115142972A CN 115142972 A CN115142972 A CN 115142972A CN 202110338262 A CN202110338262 A CN 202110338262A CN 115142972 A CN115142972 A CN 115142972A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 239000000446 fuel Substances 0.000 claims description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000002485 combustion reaction Methods 0.000 claims description 9
- 230000010354 integration Effects 0.000 claims description 4
- 230000002028 premature Effects 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 9
- 230000004913 activation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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- 230000000979 retarding effect Effects 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/02—Circuit arrangements for generating control signals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/027—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions using knock sensors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
The invention relates to the technical field of engines, in particular to a method, a device and a system for controlling the out-of-control pre-ignition of an engine, which comprises the following steps: acquiring the current state of a first cylinder, the current state of a second cylinder, the current state of an oil sprayer and the current opening degree of an accelerator pedal; controlling the first cylinder to cut off oil according to the current state of the first cylinder in the pre-ignition state and the current state of the oil injector in the oil injection state; and controlling the first cylinder to recover oil supply and the second cylinder to cut off oil according to the condition that the current state of the second cylinder is in the pre-ignition state or the current opening degree of an accelerator pedal is zero, so that the condition that the pre-ignition at medium and large loads is out of control can be effectively inhibited.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method, a device and a system for controlling the out-of-control pre-ignition of an engine.
Background
In the prior art, the requirements of various national regulations on automobile emission and oil consumption are higher and higher, the miniaturization and pressurization of the engine are effective methods for meeting the requirements, but the miniaturization and pressurization of the engine can generate a negative problem, namely the preignition of low speed and large load. The pre-ignition refers to abnormal combustion in which large-area spontaneous combustion occurs when the oil-gas mixture reaches the spontaneous combustion condition before normal ignition. And therefore cannot be prevented by retarding the ignition angle, which is completely different from conventional knocking. When pre-ignition occurs, very high combustion temperatures and pressures (typically maximum burst pressures greater than 100 bar) are typically generated, and are accompanied by high frequency oscillations. Pre-ignition can be a significant hazard to the engine, leading to failure of the spark plug (electrode burn, ceramic break and misfire), piston ring break, piston crown ablation, connecting rod bending, etc., resulting in engine damage. For a small-displacement supercharged engine with easy occurrence of pre-ignition, a pre-ignition control method is also necessary besides pre-ignition pre-control.
There are two methods for controlling the engine to cope with pre-ignition. The first is air-fuel ratio enrichment, adjustment of variable valve timing, and load limiting. The method sacrifices certain oil consumption and emission, but can ensure most of power. The second is to cut off fuel to the pre-firing cylinders. This method is a further measure in the case where the first method cannot suppress pre-ignition, will sacrifice fuel consumption, emissions and also will cause engine shudder, but can ensure basic power and engine safety.
The method generally adopts a pre-ignition cylinder fuel cut-off mode, and fuel supply is recovered after fuel cut-off under certain triggering conditions (such as accelerator homing, ECU power cut-off and the like). However, before the conditions are triggered, other cylinders are out of control of the pre-ignition, and the ECU cannot cut off the oil of the cylinders, so that the pre-ignition is continuously generated. This is because if both cylinders are de-fueled, the vehicle loses half of its power and the engine experiences severe jerking.
Therefore, in the prior art, the control method for the out-of-control pre-ignition of the engine cannot cope with the condition that the out-of-control pre-ignition occurs in multiple cylinders.
Disclosure of Invention
The invention aims to solve the problem that in the prior art, a control method for the out-of-control pre-ignition of an engine cannot cope with the condition that the out-of-control pre-ignition occurs in multiple cylinders.
In order to achieve the aim, the invention provides a control method for the runaway of the pre-ignition of an engine, which comprises the following specific steps:
acquiring the current state of a first cylinder, the current state of a second cylinder, the current state of an oil sprayer and the current opening degree of an accelerator pedal;
controlling the first cylinder to cut off fuel according to the current state of the first cylinder in a pre-ignition state and the current state of the fuel injector in a fuel injection state;
and controlling the first cylinder to recover oil supply and the second cylinder to cut off oil supply according to the condition that the current state of the second cylinder is in a pre-ignition state or the condition that the current opening degree of the accelerator pedal is zero.
Optionally, the pre-ignition state according to the current state of the first cylinder further comprises:
acquiring a pre-ignition threshold value and a current pre-ignition integral value of the first cylinder;
controlling a counter to count a pre-ignition count value according to the condition that the pre-ignition integral value of the first cylinder is larger than the pre-ignition threshold value;
and detecting that the current state of the first cylinder is in a pre-ignition state according to the condition that the pre-ignition count value is greater than a preset pre-ignition time threshold value.
Optionally, the obtaining the pre-ignition threshold value includes:
acquiring the current load of an engine and the current rotating speed of the engine;
the pre-ignition threshold is obtained based on a current load of the engine and a current speed of the engine.
Optionally, the acquiring the current pre-ignition integration value of the first cylinder comprises:
and acquiring the value of a knock sensor of the first cylinder, and acquiring the current pre-ignition integral value of the first cylinder according to the value of the knock sensor of the first cylinder.
Optionally, the controlling the counter to count the pre-ignition count value according to the fact that the pre-ignition integral value of the first cylinder is greater than the pre-ignition threshold value further includes:
and controlling the pre-ignition count value to be reduced according to the condition that the pre-ignition count value is not greater than a preset pre-ignition time threshold value.
Optionally, before acquiring the current state of the first cylinder and the current state of the second cylinder, the method further includes:
acquiring the current load of the engine, the current water temperature of the engine and the current state of a knock sensor;
and carrying out the next step according to the conditions that the current load of the engine is greater than the preset load, the current water temperature of the engine is greater than the preset water temperature and the current state of the knock sensor is a working state.
Optionally, the controlling the first cylinder to cut off oil further includes:
and controlling the counter to clear the pre-ignition count value.
Optionally, the pre-ignition state according to the current state of the first cylinder further comprises:
and judging that the current state of the first cylinder is in a pre-ignition state in the power stroke time of the engine.
The invention of the present application also provides a control device for engine pre-ignition runaway, which is used for executing the control method for engine pre-ignition runaway as described above, wherein the control device for engine pre-ignition runaway comprises: an acquisition unit, and an oil control unit, wherein:
the acquiring unit is used for acquiring the current state of the first cylinder, the current state of the second cylinder, the current state of the oil sprayer and the current opening degree of an accelerator pedal;
the oil control unit is used for controlling the first cylinder to cut off oil according to the fact that the current state of the first cylinder is in a pre-ignition state and the current state of the oil injector is in an oil injection state; and controlling the first cylinder to recover oil supply and the second cylinder to cut off oil supply according to the condition that the current state of the second cylinder is in a pre-ignition state or the condition that the current opening of the accelerator pedal is zero.
The invention also provides a control system for the early ignition runaway of the engine, which comprises the control device for the early ignition runaway of the engine, wherein the control device comprises a control module and a control module;
the control device for the early combustion runaway of the engine further comprises: an ECU controller;
the ECU controller controls the oil sprayer of the first cylinder to be opened or closed;
and the ECU controller controls the fuel injectors of the second cylinders to be opened or closed respectively.
The embodiment of the invention has the following technical effects:
according to the control method for the out-of-control pre-ignition of the engine, the first cylinder is controlled to be cut off according to the fact that the current state of the first cylinder is in the pre-ignition state, the current state of the oil injector is in the oil injection state, the first cylinder is controlled to recover oil supply and the second cylinder is controlled to be cut off according to the fact that the current state of the second cylinder is in the pre-ignition state or the current opening degree of the accelerator pedal is zero, the pre-ignition at medium and large loads is effectively inhibited, and the condition that the out-of-control pre-ignition occurs in multiple cylinders can be met.
Drawings
FIG. 1 is a flow chart of a method for controlling runaway of pre-ignition of an engine provided in embodiment 1 of the invention;
FIG. 2 is a logic diagram of a control method for runaway pre-ignition of the engine in the embodiment shown in FIG. 1;
FIG. 3 is a logic diagram illustrating the calculation of a pre-ignition flag in the control method for runaway pre-ignition of the engine shown in FIG. 2;
FIG. 4 is a logic diagram of the preignition detection activation flag in the control method for runaway preignition of the engine in the embodiment shown in FIG. 2.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
In the present invention, the knock sensor: engine vibrations are detected. If pre-ignition occurs, the sensor will detect an abnormal vibration frequency. Therefore, the knock sensor must be operating normally when detecting pre-ignition.
The various components involved in the various embodiments of the engine preignition runaway control apparatus of the present application are explained above to facilitate understanding by those skilled in the art. It should be noted that the above listed components are not necessarily included in the control device for the premature ignition runaway of the engine in the present application.
As shown in FIG. 1, the method for controlling the runaway of the pre-ignition of the engine provided by the application comprises the following specific steps:
s1, acquiring the current state of a first cylinder, the current state of a second cylinder, the current state of an oil sprayer and the current opening degree of an accelerator pedal;
s2, controlling the first cylinder to cut off fuel according to the fact that the current state of the first cylinder is in a pre-ignition state and the current state of the fuel injector is in a fuel injection state;
and S3, controlling the first cylinder to recover oil supply and the second cylinder to cut off oil supply according to the condition that the current state of the second cylinder is in the pre-ignition state or the condition that the current opening degree of an accelerator pedal is zero.
Specifically, the pre-ignition conditions of other cylinders are continuously detected after fuel cut is executed, and if the pre-ignition runaway of other cylinders also occurs, the fuel supply of the fuel cut cylinder is restored, and the fuel cut of other cylinders with the pre-ignition runaway occurs. Under the condition of keeping basic power, the condition that a certain cylinder continuously ignites for a long time to damage an engine is avoided.
Optionally, the pre-ignition state according to the current state of the first cylinder further comprises:
s21, acquiring a pre-ignition threshold value and a current pre-ignition integral value of a first cylinder;
s22, controlling a counter to count a pre-ignition count value according to the condition that the pre-ignition integral value of the first cylinder is larger than a pre-ignition threshold value;
and S23, detecting that the current state of the first cylinder is in the pre-ignition state according to the fact that the pre-ignition count value is larger than the preset pre-ignition time threshold value.
Specifically, the current state of the first cylinder can be detected to be in the pre-ignition state by the pre-ignition count value being greater than the preset pre-ignition time threshold value, and the detection method of the pre-ignition state of the second cylinder is the same as the detection method of the pre-ignition state of the first cylinder.
Optionally, obtaining the pre-ignition threshold comprises: acquiring the current load of an engine and the current rotating speed of the engine; the pre-ignition threshold is obtained based on a current load of the engine and a current speed of the engine.
Specifically, the pre-ignition is manufactured by human experiment, the engine is adjusted to a specific rotating speed and a specific load, and the pre-ignition integral value of the first cylinder is obtained, wherein the pre-ignition integral value of the first cylinder is the pre-ignition threshold value. The pre-ignition threshold is a value calibrated in advance.
Optionally, the acquiring the current pre-ignition integration value of the first cylinder comprises:
a value of a knock sensor of the first cylinder is acquired, and a current pre-ignition integration value of the first cylinder is acquired based on the value of the knock sensor of the first cylinder.
Specifically, the knock sensor outputs a signal, and the pre-ignition integral value is obtained through integral calculation.
Optionally, the controlling the counter to count the pre-ignition count value according to the pre-ignition integrated value of the first cylinder being greater than the pre-ignition threshold value further includes:
specifically, the pre-ignition count value is controlled to be reduced according to the fact that the pre-ignition count value is not larger than a preset pre-ignition time threshold value.
Optionally, before acquiring the current state of the first cylinder and the current state of the second cylinder, the method further includes: acquiring the current load of the engine, the current water temperature of the engine and the current state of a knock sensor; and carrying out the next step according to the conditions that the current load of the engine is greater than the preset load, the current water temperature of the engine is greater than the preset water temperature and the current state of the knock sensor is a working state.
Specifically, the pre-ignition detection function is activated according to the fact that the current load of the engine is larger than the preset load, the current water temperature of the engine is larger than the preset water temperature, and the current state of the knock sensor is a working state, if the pre-ignition detection function is not activated, the condition of pre-ignition missing judgment can occur, and further the engine can be damaged.
Optionally, after controlling the first cylinder to cut off oil, the method further includes: and the control counter clears the pre-ignition count value.
Specifically, if the number of preignitions in a period of time is less than the preignition number threshold, the preignition count is gradually decreased to 0 or is detected again during the decrease, such that the count is increased.
Optionally, the pre-ignition state according to the current state of the first cylinder further comprises: and judging that the current state of the first cylinder is in a pre-ignition state in the working stroke time of the engine.
Specifically, whether pre-ignition occurs is judged, and the judged cycle time is the working stroke time of the engine, for example, the four-cylinder engine works twice after one rotation, and the judgment is carried out twice.
The invention of the present application also provides an engine pre-ignition runaway control device, which is used for executing the above engine pre-ignition runaway control method, wherein the engine pre-ignition runaway control device comprises: an acquisition unit, and an oil control unit, wherein:
the acquiring unit is used for acquiring the current state of the first cylinder, the current state of the second cylinder, the current state of the oil sprayer and the current opening degree of an accelerator pedal;
the oil control unit is used for controlling the first cylinder to cut off oil according to the current state of the first cylinder in the pre-ignition state and the current state of the oil sprayer in the oil spraying state; and controlling the first cylinder to recover oil supply and the second cylinder to cut off oil supply according to the condition that the current state of the second cylinder is in the pre-ignition state or the condition that the current opening degree of an accelerator pedal is zero.
The invention also provides a control system for the runaway of the pre-ignition of the engine, which comprises the control device for the runaway of the pre-ignition of the engine;
the control device for the early combustion runaway of the engine further comprises: an ECU controller;
the ECU controller controls the oil sprayer of the first cylinder to be opened or closed;
and the ECU controller controls the oil injectors of the second cylinders to be opened or closed respectively.
Specifically, the fuel injector on the first cylinder is controlled to be closed to cut off fuel, and the fuel injector on the second cylinder is controlled to supply fuel.
The specific work of the control method for the engine early combustion out of control provided by the invention is as follows: the method comprises the steps of obtaining a water temperature signal, a load signal, a rotating speed signal and a knock sensor signal, then judging whether the pre-ignition occurs or not, and finally taking measures to inhibit the continuous occurrence of the pre-ignition. The first step is to determine whether pre-ignition detection is enabled. The enabling conditions are: the current load is greater than a preset load limit value; the current water temperature exceeds a preset water temperature limit value; the knock sensor is in a normal operating state. And the second step is to calculate the pre-ignition threshold value of the current working condition point according to the current rotating speed and the current load. The pre-ignition threshold value has difference along with the change of the rotating speed load and is interpolated by a three-dimensional curved surface. And the third step is to judge whether the pre-ignition occurs or not and finally output a pre-ignition flag value. The judged cycle time is the working stroke time of the engine, for example, the four-cylinder engine works twice after rotating one circle, and the judgment is carried out twice. And fourthly, counting the number of preignition times in a period of time, if the number of preignition times is larger than a preignition time threshold value, judging that the cylinder is out of control of preignition, and performing fuel cut on the cylinder. If the number of preignitions in a period of time is less than the preignition number threshold, the preignition count is gradually decreased to 0 or is detected again during the decrease, such that the count is increased. And fifthly, continuously detecting the pre-ignition conditions of other cylinders after the oil cut is executed, and if the pre-ignition of other cylinders is out of control, recovering the oil supply of the other cylinders and cutting off the oil of the other cylinders. Under the condition of keeping basic power, the condition that a certain cylinder continuously pre-ignites for a long time to damage an engine is avoided.
As shown in fig. 2 to fig. 4, the specific logic of the control method for the engine pre-ignition runaway provided by the invention is as follows: (1) The knock sensor is in operation, namely the activation flag bit =1 of the knock sensor; (2) When the load of the engine is larger than the load limit value, no pre-ignition can occur when the load is too small; (3) When the water temperature of the engine is higher than the water temperature limit value, the water temperature is too low, and pre-ignition is not possible; (4) The three conditions are met, so that the pre-ignition detection function is activated, namely the pre-ignition detection activation flag bit is set; (5) Calculating to obtain a pre-ignition threshold value of the current engine according to the rotating speed and the load, wherein the pre-ignition threshold value is obtained by pre-ignition calibration; (6) Setting the pre-ignition flag bit when the pre-ignition integral value is greater than the pre-ignition threshold value under the condition of activating the pre-ignition detection flag bit; (7) And the pre-ignition mark position is once, and the pre-ignition count is increased by one. When the pre-ignition count is greater than the pre-ignition out-of-control times threshold value and the fuel cut-off flag bit is equal to 0, setting the pre-ignition out-of-control flag bit and the fuel cut-off flag bit, and triggering measures for fuel cut-off of the pre-ignition out-of-control cylinder; (8) After the fuel cut-off flag position is set, the pre-ignition calculation is set to zero, and the pre-ignition out-of-control flag position is set to zero; (9) And after the fuel cut-off flag bit is set, starting to monitor whether the accelerator pedal returns to zero or whether the pre-ignition out-of-control flag bit is zero, if one of the pre-ignition out-of-control flag bits is true, recovering the fuel cut-off of the cylinder which originally cuts off the fuel, and enabling the fuel cut-off flag bit to be zero.
In summary, according to the control method for the runaway pre-ignition of the engine provided by the invention, the fuel cut-off of the first cylinder is controlled according to the fact that the current state of the first cylinder is in the pre-ignition state and the current state of the fuel injector is in the fuel injection state, and the fuel supply recovery of the first cylinder and the fuel cut-off of the second cylinder are controlled according to the fact that the current state of the second cylinder is in the pre-ignition state or the current opening degree of an accelerator pedal is zero, so that the pre-ignition at medium and large loads can be effectively inhibited, and the runaway multi-cylinder pre-ignition condition can be responded.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In addition, the terms "first", "second", and the like are employed in the present invention to describe various information, but the information should not be limited to these terms, which are used only to distinguish the same type of information from each other. For example, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information, without departing from the scope of the present invention.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A control method for the early combustion out of control of an engine is characterized by comprising the following specific steps:
acquiring the current state of a first cylinder, the current state of a second cylinder, the current state of an oil sprayer and the current opening degree of an accelerator pedal;
controlling the first cylinder to cut off fuel according to the current state of the first cylinder in a pre-ignition state and the current state of the fuel injector in a fuel injection state;
and controlling the first cylinder to recover oil supply and the second cylinder to cut off oil supply according to the condition that the current state of the second cylinder is in a pre-ignition state or the condition that the current opening degree of the accelerator pedal is zero.
2. The control method for runaway of engine pre-ignition of claim 1, wherein the pre-ignition state based on the current state of the first cylinder further comprises:
acquiring a pre-ignition threshold value and a current pre-ignition integral value of the first cylinder;
controlling a counter to count a pre-ignition count value according to the pre-ignition integral value of the first cylinder being greater than the pre-ignition threshold value;
and detecting that the current state of the first cylinder is in a pre-ignition state according to the condition that the pre-ignition count value is greater than a preset pre-ignition time threshold value.
3. The control method for runaway engine pre-ignition of claim 2, wherein the obtaining the pre-ignition threshold comprises:
acquiring the current load of an engine and the current rotating speed of the engine;
the pre-ignition threshold is obtained based on a current load of the engine and a current speed of the engine.
4. The control method for runaway of engine pre-ignition of claim 2, wherein the obtaining the current pre-ignition integration value for the first cylinder comprises:
and acquiring the value of a knock sensor of the first cylinder, and acquiring the current pre-ignition integral value of the first cylinder according to the value of the knock sensor of the first cylinder.
5. The method for controlling the runaway of the pre-ignition of the engine as recited in claim 2, wherein the controlling the counter to count the pre-ignition count value in response to the pre-ignition integral value of the first cylinder being greater than the pre-ignition threshold value further comprises:
and controlling the pre-ignition count value to be reduced according to the condition that the pre-ignition count value is not greater than a preset pre-ignition time threshold value.
6. The method for controlling the runaway of the pre-ignition of the engine as recited in claim 2, wherein the obtaining the current state of the first cylinder and the current state of the second cylinder further comprises:
acquiring the current load of the engine, the current water temperature of the engine and the current state of a knock sensor;
according to the condition that the current load of the engine is greater than the preset load, the current water temperature of the engine is greater than the preset water temperature and the current state of the knock sensor is a working state, proceed to the next step.
7. The method for controlling engine pre-ignition runaway as recited in claim 2, further comprising, after controlling the first cylinder to de-fuel:
and controlling the counter to clear the pre-ignition count value.
8. The control method for runaway of engine pre-ignition of claim 1, wherein the pre-ignition state based on the current state of the first cylinder further comprises:
and judging that the current state of the first cylinder is in a pre-ignition state in the working stroke time of the engine.
9. An engine pre-ignition runaway control apparatus for executing the engine pre-ignition runaway control method as recited in claim 1, characterized by comprising: an acquisition unit, and an oil control unit, wherein:
the acquiring unit is used for acquiring the current state of the first cylinder, the current state of the second cylinder, the current state of the oil sprayer and the current opening degree of an accelerator pedal;
the oil control unit is used for controlling the first cylinder to cut off oil according to the fact that the current state of the first cylinder is in a pre-ignition state and the current state of the oil injector is in an oil injection state; and controlling the first cylinder to recover oil supply and the second cylinder to cut off oil supply according to the condition that the current state of the second cylinder is in a pre-ignition state or the condition that the current opening degree of the accelerator pedal is zero.
10. A control system for runaway premature ignition of an engine, the control system comprising the control device for runaway premature ignition of the engine as recited in claim 9;
the control device for the early combustion runaway of the engine further comprises: an ECU controller;
the ECU controller controls the oil sprayer of the first cylinder to be opened or closed;
and the ECU controller controls the fuel injectors of the second cylinders to be opened or closed respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110338262.9A CN115142972B (en) | 2021-03-29 | 2021-03-29 | Control method, device and system for engine pre-ignition runaway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110338262.9A CN115142972B (en) | 2021-03-29 | 2021-03-29 | Control method, device and system for engine pre-ignition runaway |
Publications (2)
| Publication Number | Publication Date |
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| CN115142972A true CN115142972A (en) | 2022-10-04 |
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