CN109973230B - Internal combustion engine starting method, internal combustion engine starting device, engine control apparatus, and storage medium - Google Patents
Internal combustion engine starting method, internal combustion engine starting device, engine control apparatus, and storage medium Download PDFInfo
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- CN109973230B CN109973230B CN201910327221.2A CN201910327221A CN109973230B CN 109973230 B CN109973230 B CN 109973230B CN 201910327221 A CN201910327221 A CN 201910327221A CN 109973230 B CN109973230 B CN 109973230B
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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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
- F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
- F02D2200/0406—Intake manifold pressure
Abstract
The present application relates to a starting method and apparatus for an internal combustion engine, an engine control device for an internal combustion engine, and a storage medium. The method comprises the following steps: after the ignition signal is detected, if the fuel in the cylinder reaches an over-rich condition, the fuel injection amount is attenuated according to a first attenuation coefficient; judging whether the air pressure in the air inlet pipe is stable or not according to the measured pressure parameter and the theoretical pressure parameter; wherein the theoretical pressure parameter is determined from a plurality of measured pressure parameters; if the air pressure in the air inlet pipe is unstable, fuel oil is injected according to the target flow; the target flow is determined according to the theoretical pressure parameter and a preset fuel map. The method can simplify the starting structure of the internal combustion engine and effectively reduce the starting cost of the internal combustion engine.
Description
Technical Field
The present application relates to the field of power machine control technology, and in particular, to a starting method and device for an internal combustion engine, an engine control device for an internal combustion engine, and a storage medium.
Background
When an internal combustion engine is started in a cold state, the amount of oil supplied to the engine is generally increased to ensure the startability of the internal combustion engine. This mode is commonly referred to as start-up delta compensation. In the process of realizing heat engine along with the continuous operation of the engine, an Engine Control Unit (ECU) continuously attenuates the starting increment to zero by monitoring the temperature of the engine to finish the starting increment mode, but flameout occurs under the condition that the engine is not heated, and a large amount of liquid fuel injected is easy to remain in an air passage and a cylinder wall. Under the condition that the unvaporized residual oil exists, the engine is restarted, so that the fuel in the cylinder is too rich, the starting is difficult, and even the situation that the spark plug is drowned and cannot be started occurs. The conventional scheme usually estimates the degree of residual oil volatilization (residual oil amount) by the ECU memorizing the stop time between the shutdown and the restart, and appropriately reduces the incremental compensation at the restart. The premise of realizing the starting of the internal combustion engine by the traditional scheme is that the ECU can be correspondingly judged and memorized only by being in a power-on state and being provided with a corresponding memory device, so that the purpose of starting the internal combustion engine is achieved, the cost for starting the internal combustion engine is high, and the poor starting performance is caused by the deviation of estimation precision under the complex conditions of different fuel components, different air pressures, different environmental temperatures and the like.
Disclosure of Invention
In view of the above, it is necessary to provide an internal combustion engine starting method, an apparatus, an engine control device of an internal combustion engine, and a storage medium capable of improving starting performance in a manner of reducing starting cost of the internal combustion engine and determining an injection amount according to an actual operation condition, in view of the above-described technical problems.
A method of starting an internal combustion engine, the method comprising:
after the ignition signal is detected, if the fuel in the cylinder reaches an over-rich condition, the fuel injection amount is attenuated according to a first attenuation coefficient;
judging whether the air pressure in the air inlet pipe is stable or not according to the measured pressure parameter and the theoretical pressure parameter;
if the air pressure in the air inlet pipe is unstable, fuel oil is injected according to the target flow; the target flow is determined according to the theoretical pressure parameter and a preset fuel map.
In one embodiment, the determining whether the air pressure in the intake pipe is stable according to the measured pressure parameter and the theoretical pressure parameter includes:
and if the difference between the actual measurement pressure parameter and the theoretical pressure parameter is not within the preset difference range, determining that the air pressure in the air pipe is unstable.
In one embodiment, the determining of the theoretical pressure parameter may include:
and eliminating the peak value in the plurality of actually measured pressure parameters, and determining the theoretical pressure parameter according to the actually measured pressure parameters after the peak value is eliminated.
In one embodiment, the determining of the theoretical pressure parameter may further include:
and performing smooth filtering processing on the current actual pressure parameter and the previous actual pressure parameter to obtain a theoretical pressure parameter.
In one embodiment, after detecting the ignition signal, the method further comprises:
and continuously attenuating the fuel injection quantity according to a second attenuation coefficient, and when the fuel injection quantity is attenuated to a set injection value, if the engine speed is lower than a first speed threshold value, determining that the fuel in the cylinder reaches an over-rich condition.
As an example, before continuously attenuating the fuel injection amount by the second attenuation coefficient, the scheme further includes:
and reading an initial fuel injection quantity value corresponding to the current temperature from a preset injection quantity table, and injecting fuel according to the initial fuel injection quantity value.
In one embodiment, after detecting the ignition signal, the method further comprises:
and detecting the rotating speed reduction speed of the engine after the rotating speed reaches the rotating speed peak value, and if the rotating speed reduction speed is greater than a second rotating speed threshold value, judging that the fuel oil in the cylinder reaches an over-rich condition.
An internal combustion engine starting apparatus, the apparatus comprising:
the attenuation module is used for attenuating the fuel injection quantity according to a first attenuation coefficient if the fuel in the cylinder reaches an over-rich condition after the ignition signal is detected;
the judging module is used for judging whether the air pressure in the air inlet pipe is stable or not according to the measured pressure parameter and the theoretical pressure parameter;
the injection control module is used for injecting fuel oil according to the target flow rate if the air pressure in the air inlet pipe is unstable; the target flow is determined according to the theoretical pressure parameter and a preset fuel map.
An engine control apparatus of an internal combustion engine, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
after the ignition signal is detected, if the fuel in the cylinder reaches an over-rich condition, the fuel injection amount is attenuated according to a first attenuation coefficient;
judging whether the air pressure in the air inlet pipe is stable or not according to the measured pressure parameter and the theoretical pressure parameter;
if the air pressure in the air inlet pipe is unstable, fuel oil is injected according to the target flow; the target flow is determined according to the theoretical pressure parameter and a preset fuel map.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
after the ignition signal is detected, if the fuel in the cylinder reaches an over-rich condition, the fuel injection amount is attenuated according to a first attenuation coefficient;
judging whether the air pressure in the air inlet pipe is stable or not according to the measured pressure parameter and the theoretical pressure parameter;
if the air pressure in the air inlet pipe is unstable, fuel oil is injected according to the target flow; the target flow is determined according to the theoretical pressure parameter and a preset fuel map.
According to the internal combustion engine starting method and device, the engine control equipment and the storage medium of the internal combustion engine, after the ignition signal is detected, when the fuel in the cylinder reaches the over-rich condition, the fuel injection amount is attenuated according to the first attenuation coefficient, and when the air pressure in the air inlet pipe is unstable, the fuel is injected according to the target flow corresponding to the theoretical pressure parameter, so that the internal combustion engine is smoothly started, the starting process of the internal combustion engine can be simplified, correspondingly, the starting structure of the internal combustion engine is simplified, and the starting cost of the internal combustion engine is effectively reduced.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for starting an internal combustion engine according to one embodiment;
FIG. 2 is a schematic diagram of smoothing filtering of a measured curve according to an embodiment;
FIG. 3 is a block diagram showing the construction of a starting apparatus for an internal combustion engine according to one embodiment;
fig. 4 is an internal structural view of an engine control apparatus of an internal combustion engine in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The internal combustion engine starting method provided by the application can be applied to an Engine Control Unit (ECU) of an internal combustion engine. After the engine control unit detects the ignition signal, if the fuel in the cylinder is identified to reach an over-rich condition, the fuel injection amount is attenuated according to a first attenuation coefficient; judging whether the air pressure in the air inlet pipe is stable or not according to the measured pressure parameter and the theoretical pressure parameter; if the air pressure in the air inlet pipe is unstable, fuel is injected according to a target flow determined according to a theoretical pressure parameter and a preset fuel map, so that the internal combustion engine is started, the starting structure of the internal combustion engine is simplified, and the starting cost of the internal combustion engine is reduced.
In one embodiment, as shown in fig. 1, there is provided a starting method of an internal combustion engine, which is described by taking an ECU applied to the internal combustion engine as an example, and includes the steps of:
and S210, after the ignition signal is detected, if the fuel in the cylinder reaches an over-rich condition, the fuel injection amount is attenuated according to a first attenuation coefficient.
The ECU detects whether the internal combustion engine where the ECU is located is ignited or not, after an ignition signal of the internal combustion engine is detected, starting parameters such as the rotating speed of the engine are read, whether the fuel in the cylinder of the internal combustion engine is over-rich or not is judged according to the starting parameters, if the fuel in the cylinder of the internal combustion engine is over-rich, namely the fuel in the cylinder reaches an over-rich condition, the fuel injection quantity is greatly attenuated according to a first attenuation coefficient, and redundant residual fuel in the cylinder is swept.
The first attenuation coefficient may be set according to the configuration characteristics of the engine in the internal combustion engine, for example, set to a large attenuation value such as 80%, and the fuel injection amount may be rapidly attenuated to 20% of the original injection amount according to the first attenuation coefficient. After the fuel injection quantity is greatly attenuated, the redundant residual oil in the cylinder is continuously reduced, the rotating speed of the engine is gradually increased by proper air-fuel ratio, and the ECU can be switched to a mode after starting from a mode at the starting time after ignition according to mode switching conditions.
Alternatively, the start-time mode and the post-start mode may be determined according to the engine speed, where the internal combustion engine is in the start-time mode before the engine speed reaches a certain speed threshold (e.g., a first speed threshold), and the start-up process after the engine speed reaches the speed threshold is in the post-start mode.
S230, judging whether the air pressure in the air inlet pipe is stable or not according to the actual measurement pressure parameter and the theoretical pressure parameter;
the theoretical pressure parameter is an air pressure value which should be possessed in the intake pipe after the intake pressure in the intake pipe is stable, and can be determined according to a plurality of actually measured pressure parameters which are currently measured in the intake pipe. After ignition of the engine, the ECU may read the air pressure in the manifold at regular intervals to obtain a plurality of measured pressure parameters. Because the rotating speed is extremely low and the air pressure in the air inlet pipe is extremely unstable, stable air inlet pressure cannot be formed in the air inlet pipe. Under the operating condition, if the ECU estimates the air intake quantity according to the read pressure parameter, calculates and executes fuel injection, the injected fuel will exceed the fuel injection quantity actually required by the engine, and the internal combustion engine is likely to be incapable of being started smoothly.
In one example, the theoretical pressure parameter may be determined according to a measured pressure parameter and a preset value of the ECU, such as an average value of the measured pressure parameter and the preset value, and the like. The preset value may be obtained in advance through an experiment and preset in the ECU (for example, set to 50Kpa), in a front stage of the start mode (start-time mode, that is, in a period from ignition to start, it may be understood as ambient temperature), because the in-cylinder temperature does not reach a normal operating temperature (the in-cylinder temperature is the same as the ambient temperature at start), the pressure parameter detected by the pressure sensor is disordered and cannot be directly used for determining the fuel injection amount, but the detected pressure value and the preset value are smoothed and used for determining the fuel injection amount; when the temperature in the cylinder reaches the normal operating temperature after the start, the value obtained by the smoothing calculation process is transitioned to a value directly using the detected pressure value to determine the fuel injection amount. When the temperature does not reach the working temperature value, the value after smoothing treatment can be used for replacing the actual detection value, and after the temperature reaches the working temperature, the actual detection value (the actual measurement pressure parameter) can be directly used for injection control.
S250, if the air pressure in the air inlet pipe is unstable, injecting fuel oil according to the target flow rate; the target flow is determined according to the theoretical pressure parameter and a preset fuel map.
The fuel map can record fuel injection control parameters such as fuel flow and/or throttle opening corresponding to each pressure parameter. Specifically, the fuel injection control parameter corresponding to the theoretical pressure parameter can be searched in the fuel map, the target flow rate is determined according to the fuel injection control parameter, and the fuel is injected according to the target flow rate, so that the air pressure in the air inlet pipe is stabilized, and the internal combustion engine can be started smoothly.
The fuel map acquiring process may include: and carrying out multiple starting experiments aiming at the corresponding internal combustion engine, detecting fuel injection control parameters such as fuel flow and/or throttle opening and the like corresponding to each pressure parameter in the air inlet pipe in the process of smoothly starting the internal combustion engine, and generating a fuel map according to the fuel injection control parameters corresponding to each pressure parameter. And pre-storing the fuel map to the ECU so that the ECU can determine the fuel flow corresponding to the theoretical pressure parameter in the process of controlling the starting of the internal combustion engine.
According to the starting method of the internal combustion engine, after the ignition signal is detected, when the fuel oil in the cylinder reaches the over-rich condition, the fuel oil injection amount is attenuated according to the first attenuation coefficient, and when the air pressure in the air inlet pipe is unstable, the fuel oil is injected according to the target flow rate corresponding to the theoretical pressure parameter, so that the internal combustion engine is started smoothly, the starting process of the internal combustion engine can be simplified, correspondingly, the starting structure of the internal combustion engine is simplified, and the starting cost of the internal combustion engine is effectively reduced.
In order to accurately detect the stability of the air pressure in the air inlet pipe, in an embodiment, the determining whether the air pressure in the air inlet pipe is stable according to the measured pressure parameter and the theoretical pressure parameter includes:
and if the difference between the actual measurement pressure parameter and the theoretical pressure parameter is not within the preset difference range, determining that the air pressure in the air pipe is unstable.
The above-described difference range may be set depending on the configuration characteristics of the internal combustion engine, for example, to a range of-0.1 Pa (pascal) to 0.1 Pa. If the difference between the actual measurement pressure parameter and the theoretical pressure parameter is within the preset difference range, that is, the theoretical pressure parameter is very close to the pressure measurement parameter, a good balance relation associated with the rotating speed is established in the intake pipe at this time, it can be determined that the intake pressure in the intake pipe is in a stable state (the air pressure in the intake pipe is stable), and the corresponding internal combustion engine can be started according to a conventional manner. If the difference between the measured pressure parameter and the theoretical pressure parameter is not within the preset difference range, it is indicated that the air pressure in the air pipe has not reached a stable state, and at this time, if the internal combustion engine is started in a conventional manner, the internal combustion engine cannot be started smoothly, the target flow rate needs to be determined again according to the theoretical pressure parameter, and fuel oil is injected according to the target flow rate to start the internal combustion engine smoothly.
In one embodiment, the process of determining the theoretical pressure parameter may include:
and eliminating the peak value in the plurality of actually measured pressure parameters, and determining the theoretical pressure parameter according to the actually measured pressure parameters after the peak value is eliminated.
Specifically, after the peak values in the plurality of measured pressure parameters are removed, the theoretical pressure parameters can be determined according to the average value of each measured pressure parameter after the peak values are removed, so that the interference caused by noise in the pressure parameter measuring process is weakened, and the accuracy of the determined theoretical pressure parameters is improved.
As an example, referring to fig. 2, an actual measurement curve (as shown by a solid line in fig. 2) corresponding to a plurality of actual measurement pressure parameters may be drawn, and the actual measurement curve is subjected to a smoothing filtering process to remove a peak value in the actual measurement curve, so as to obtain a smooth curve (as shown by a dashed line in fig. 2), and a corresponding theoretical pressure parameter is determined according to the smooth curve.
In another embodiment, the process of determining the theoretical pressure parameter may further include:
and performing smooth filtering processing on the current actual pressure parameter and the previous actual pressure parameter to obtain a theoretical pressure parameter.
Specifically, the current actual pressure parameter and the previous actual pressure parameter may be respectively substituted into the smoothing filter formula to calculate the corresponding theoretical pressure parameter. The smoothing filter formula includes:
PM'＝PM1+δ×PM1-PM2，
wherein PM' represents a theoretical pressure parameter, PM1Representing the current actual pressure parameter, delta the smoothing factor, PM2Representing the previous measured pressure parameter. The smoothing coefficient δ may be set according to the filtering accuracy.
In this embodiment, the current actual pressure parameter and the previous actual pressure parameter are subjected to smoothing filtering, so that a more accurate theoretical pressure parameter can be obtained.
According to the traditional scheme, a concentration detection sensor is usually adopted to detect the fuel concentration in a cylinder and judge whether the fuel concentration reaches an over-rich condition, however, the concentration detection sensor can only accurately acquire the fuel concentration under a specific temperature environment (such as 200-300 ℃), however, the temperature in the cylinder is often difficult to maintain in the specific temperature environment, and thus, whether the fuel in the cylinder reaches the over-rich condition is difficult to accurately detect.
To more accurately detect whether the fuel in the cylinder has reached the over-rich condition, in one embodiment, after detecting the ignition signal, the method further comprises:
and continuously attenuating the fuel injection quantity according to a second attenuation coefficient, and when the fuel injection quantity is attenuated to a set injection value, if the engine speed is lower than a first speed threshold value, determining that the fuel in the cylinder reaches an over-rich condition.
The second attenuation factor may be set to a relatively small attenuation factor, for example to 5% of the value. The above-described set injection value may be set according to the configuration characteristics of the internal combustion engine, for example, to be 30% equivalent of the original injection value of the engine. The first speed threshold may be set to a speed value of 1200 rpm or the like.
After the ECU detects the ignition signal, namely at the initial stage of injection control, the fuel injection quantity is gradually reduced according to a second attenuation coefficient, namely the fuel quantity injected each time is attenuated by a proportion corresponding to the second attenuation coefficient (for example, the fuel quantity injected each time is attenuated by 5%), when the fuel injection quantity is attenuated to a set injection value, the rotating speed of the engine is still lower than a first rotating speed threshold value, the fuel in the cylinder reaches an over-rich condition, the engine is not started smoothly, and at the moment, the fuel injection quantity needs to be attenuated by a large quantity.
As an example, before continuously attenuating the fuel injection amount by the second attenuation coefficient, the scheme further includes:
and reading an initial fuel injection quantity value corresponding to the current temperature from a preset injection quantity table, and injecting fuel according to the initial fuel injection quantity value.
When just starting to ignite, the in-cylinder temperature is low (equal to ambient temperature), and the pressure is close to the vacuum, and engine slew velocity is extremely low (driven by the starter motor and passive rotation), can't carry out the injection according to the data in Map (fuel Map) when normal operating, can predetermine injection scale (Table) this moment, and the data constitution in the Table is than in Map is simple, only is used for the stage when starting: different from Map recording a pressure value (or throttle opening), an engine speed and/or an oil injection three-dimensional Table, Table records: the cylinder temperature and oil injection quantity two-dimensional table can show the corresponding relation between the cylinder temperature and the oil injection quantity, such as: immediately after ignition, when the ambient temperature (in-cylinder temperature) is minus 5 degrees, the fuel injection amount corresponding to minus 5 degrees is injected, and when the ambient temperature is 0 degrees, the fuel injection amount corresponding to 0 degrees is injected. The fuel may be attenuated by a predetermined proportion on the basis of the second attenuation coefficient on the basis of the preset value on the previous time at a time, and may be attenuated by a large proportion on the basis of the previous time when it is determined that the fuel is excessively rich on the basis of the first attenuation coefficient.
The embodiment can read the initial fuel injection quantity value corresponding to the current temperature from the preset injection quantity table after the internal combustion engine is ignited so as to control fuel injection, so that the determined initial fuel injection quantity value is matched with the real-time temperature in the cylinder, and the starting effect of the internal combustion engine can be further improved.
To more accurately detect whether the fuel in the cylinder has reached the over-rich condition, in another embodiment, after detecting the ignition signal, the method may further comprise:
and detecting the rotating speed reduction speed of the engine after the rotating speed reaches the rotating speed peak value, and if the rotating speed reduction speed is greater than a second rotating speed threshold value, judging that the fuel oil in the cylinder reaches an over-rich condition.
The second rotation speed threshold may be set according to the configuration characteristics of the internal combustion engine, such as 300 rpm or the like. After the ignition signal is detected, the rotating speed of the engine gradually rises, the rotating speed of the engine possibly falls after rising to a rotating speed peak value, if the rotating speed falling speed of the engine is too high and is specifically larger than a second rotating speed threshold value, it is indicated that the fuel oil in the cylinder reaches an over-rich condition, the engine is not started smoothly, and at the moment, a large amount of fuel oil injection quantity needs to be attenuated.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps in fig. 1 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performance of the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
In one embodiment, as shown in fig. 3, there is provided an internal combustion engine starting apparatus including: an attenuation module 210, a determination module 230, and an injection control module 250, wherein:
the attenuation module 210 is configured to attenuate the fuel injection amount according to a first attenuation coefficient if the fuel in the cylinder reaches an over-rich condition after the ignition signal is detected;
the judging module 230 is configured to judge whether the air pressure in the air inlet pipe is stable according to the actual measurement pressure parameter and the theoretical pressure parameter;
an injection control module 250, configured to inject fuel according to a target flow rate if air pressure in the intake pipe is unstable; the target flow is determined according to the theoretical pressure parameter and a preset fuel map.
In one embodiment, the determining module is further configured to:
and if the difference between the actual measurement pressure parameter and the theoretical pressure parameter is not within the preset difference range, determining that the air pressure in the air pipe is unstable.
In one embodiment, the above-described internal combustion engine starting apparatus further includes:
and the rejecting module is used for rejecting a peak value in the plurality of measured pressure parameters and determining a theoretical pressure parameter according to the measured pressure parameters after the peak value is rejected.
In one embodiment, the above-described internal combustion engine starting apparatus further includes:
and the smoothing filter processing module is used for performing smoothing filter processing on the current actual pressure parameter and the previous actual pressure parameter to obtain a theoretical pressure parameter.
In one embodiment, the above-described internal combustion engine starting apparatus further includes:
and the first determination module is used for continuously attenuating the fuel injection quantity according to the second attenuation coefficient, and when the fuel injection quantity is attenuated to a set injection value, if the rotating speed of the engine is lower than a first rotating speed threshold value, the fuel in the cylinder is determined to reach an over-rich condition.
As an embodiment, the above-described internal combustion engine starting apparatus further includes:
the reading module is used for reading an initial fuel injection quantity value corresponding to the current temperature from a preset injection quantity table and injecting fuel according to the initial fuel injection quantity value; the injection quantity meter records the corresponding relation between the temperature and the fuel injection quantity.
In one embodiment, the above-described internal combustion engine starting apparatus further includes:
and the second determination module is used for detecting the rotating speed reduction speed after the rotating speed of the engine reaches the rotating speed peak value, and if the rotating speed reduction speed is greater than a second rotating speed threshold value, determining that the fuel oil in the cylinder reaches an over-rich condition.
For specific limitations of the engine starting device, reference may be made to the above limitations of the engine starting method, which are not described in detail herein. The respective modules in the above-described internal combustion engine starting apparatus may be realized in whole or in part by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, there is provided an engine control apparatus of an internal combustion engine, which may be a terminal, and whose internal configuration view may be as shown in fig. 4. The engine control device of the internal combustion engine comprises a processor, a memory, a network interface and a display screen which are connected through a system bus. Wherein the processor of the engine control device of the internal combustion engine is adapted to provide the calculation and control capabilities. The memory of the engine control device of the internal combustion engine includes a nonvolatile storage medium, an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The network interface of the engine control device of the internal combustion engine is used for communicating with an external terminal through network connection. The computer program is executed by a processor to implement a method of starting an internal combustion engine. The display screen of the engine control apparatus of the internal combustion engine may be a liquid crystal display screen or an electronic ink display screen.
Those skilled in the art will appreciate that the configuration shown in fig. 4 is a block diagram of only a part of the configuration related to the present application, and does not constitute a limitation of the engine control apparatus of the internal combustion engine to which the present application is applied, and that a specific engine control apparatus of the internal combustion engine may include more or less components than those shown in the drawings, or may combine some components, or have a different arrangement of components.
In one embodiment, there is provided an engine control apparatus for an internal combustion engine, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
after the ignition signal is detected, if the fuel in the cylinder reaches an over-rich condition, the fuel injection amount is attenuated according to a first attenuation coefficient;
judging whether the air pressure in the air inlet pipe is stable or not according to the measured pressure parameter and the theoretical pressure parameter;
if the air pressure in the air inlet pipe is unstable, fuel oil is injected according to the target flow; the target flow is determined according to the theoretical pressure parameter and a preset fuel map.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and if the difference between the actual measurement pressure parameter and the theoretical pressure parameter is not within the preset difference range, determining that the air pressure in the air pipe is unstable.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and eliminating the peak value in the plurality of actually measured pressure parameters, and determining the theoretical pressure parameter according to the actually measured pressure parameters after the peak value is eliminated.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and performing smooth filtering processing on the current actual pressure parameter and the previous actual pressure parameter to obtain a theoretical pressure parameter.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and continuously attenuating the fuel injection quantity according to a second attenuation coefficient, and when the fuel injection quantity is attenuated to a set injection value, if the engine speed is lower than a first speed threshold value, determining that the fuel in the cylinder reaches an over-rich condition.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
reading an initial fuel injection quantity value corresponding to the current temperature from a preset injection quantity table, and injecting fuel according to the initial fuel injection quantity value; the injection quantity meter records the corresponding relation between the temperature and the fuel injection quantity.
In one embodiment, the processor, when executing the computer program, further performs the steps of:
and detecting the rotating speed reduction speed of the engine after the rotating speed reaches the rotating speed peak value, and if the rotating speed reduction speed is greater than a second rotating speed threshold value, judging that the fuel oil in the cylinder reaches an over-rich condition.
In one embodiment, a computer-readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, performs the steps of:
after the ignition signal is detected, if the fuel in the cylinder reaches an over-rich condition, the fuel injection amount is attenuated according to a first attenuation coefficient;
judging whether the air pressure in the air inlet pipe is stable or not according to the measured pressure parameter and the theoretical pressure parameter;
if the air pressure in the air inlet pipe is unstable, fuel oil is injected according to the target flow; the target flow is determined according to the theoretical pressure parameter and a preset fuel map.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and if the difference between the actual measurement pressure parameter and the theoretical pressure parameter is not within the preset difference range, determining that the air pressure in the air pipe is unstable.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and eliminating the peak value in the plurality of actually measured pressure parameters, and determining the theoretical pressure parameter according to the actually measured pressure parameters after the peak value is eliminated.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and performing smooth filtering processing on the current actual pressure parameter and the previous actual pressure parameter to obtain a theoretical pressure parameter.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and continuously attenuating the fuel injection quantity according to a second attenuation coefficient, and when the fuel injection quantity is attenuated to a set injection value, if the engine speed is lower than a first speed threshold value, determining that the fuel in the cylinder reaches an over-rich condition.
In one embodiment, the computer program when executed by the processor further performs the steps of:
reading an initial fuel injection quantity value corresponding to the current temperature from a preset injection quantity table, and injecting fuel according to the initial fuel injection quantity value; the injection quantity meter records the corresponding relation between the temperature and the fuel injection quantity.
In one embodiment, the computer program when executed by the processor further performs the steps of:
and detecting the rotating speed reduction speed of the engine after the rotating speed reaches the rotating speed peak value, and if the rotating speed reduction speed is greater than a second rotating speed threshold value, judging that the fuel oil in the cylinder reaches an over-rich condition.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The terms "first \ second \ third" related to the embodiments of the present application are merely used for distinguishing similar objects, and do not represent a specific ordering for the objects, and it should be understood that "first \ second \ third" may exchange a specific order or sequence when allowed. It should be understood that "first \ second \ third" distinct objects may be interchanged under appropriate circumstances such that the embodiments of the application described herein may be implemented in an order other than those illustrated or described herein.
The terms "comprising" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product, or device that comprises a list of steps or modules is not limited to the listed steps or modules but may alternatively include other steps or modules not listed or inherent to such process, method, product, or device.
Reference herein to "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A method of starting an internal combustion engine, the method comprising:
after an ignition signal is detected, gradually reducing the fuel injection quantity according to a second attenuation coefficient, when the fuel injection quantity is attenuated to a preset injection value, if the rotating speed of the engine is smaller than a first rotating speed threshold value, judging that the fuel in the cylinder reaches an over-rich condition, and attenuating the fuel injection quantity according to a first attenuation coefficient; when the rotating speed of the engine rises to the first rotating speed threshold value, the rotating speed is reduced, if the reduction speed of the rotating speed is larger than a second rotating speed threshold value, the fact that the fuel in the cylinder reaches an over-rich condition is judged, and the fuel injection amount is attenuated according to the first attenuation coefficient;
after the fuel injection quantity is attenuated according to the first attenuation coefficient, whether the air pressure in the air inlet pipe is stable or not is judged according to the measured pressure parameter and the theoretical pressure parameter;
if the air pressure in the air inlet pipe is unstable, fuel oil is injected according to the target flow; the target flow is determined according to the theoretical pressure parameter and a preset fuel map.
2. The method of claim 1, wherein determining whether the air pressure in the intake duct is stable based on the measured pressure parameter and the theoretical pressure parameter comprises: and if the difference between the actual measurement pressure parameter and the theoretical pressure parameter is not within the preset difference range, determining that the air pressure in the trachea is unstable.
3. The method of claim 1, wherein the determination of the theoretical pressure parameter comprises:
and eliminating the peak value in the plurality of measured pressure parameters, and determining the theoretical pressure parameter according to the measured pressure parameter after the peak value is eliminated.
4. The method of claim 1, wherein the determination of the theoretical pressure parameter comprises:
and performing smooth filtering processing on the current actual pressure parameter and the previous actual pressure parameter to obtain the theoretical pressure parameter.
5. The method of claim 1, wherein before continuing to attenuate the fuel injection amount by the second attenuation factor, the method further comprises:
reading an initial fuel injection quantity value corresponding to the current temperature from a preset injection quantity table, and injecting fuel according to the initial fuel injection quantity value; and the injection quantity meter records the corresponding relation between the temperature and the injection quantity.
6. An internal combustion engine starting apparatus, characterized in that the apparatus comprises:
the attenuation module is used for gradually reducing the fuel injection quantity according to a second attenuation coefficient after detecting the ignition signal, and when the fuel injection quantity is attenuated to a preset injection value, if the rotating speed of the engine is less than a first rotating speed threshold value, determining that the fuel in the cylinder reaches an over-rich condition, and attenuating the fuel injection quantity according to a first attenuation coefficient; when the rotating speed of the engine rises to the first rotating speed threshold value, the rotating speed is reduced, if the reduction speed of the rotating speed is larger than a second rotating speed threshold value, the fact that the fuel in the cylinder reaches an over-rich condition is judged, and the fuel injection amount is attenuated according to the first attenuation coefficient;
the judgment module is used for judging whether the air pressure in the air inlet pipe is stable or not according to the actual measurement pressure parameter and the theoretical pressure parameter after the fuel injection quantity is attenuated according to the first attenuation coefficient;
the injection control module is used for injecting fuel oil according to a target flow rate if the air pressure in the air inlet pipe is unstable; the target flow is determined according to the theoretical pressure parameter and a preset fuel map.
7. An engine control apparatus of an internal combustion engine, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method according to any one of claims 1 to 6 are implemented when the computer program is executed by the processor.
8. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 6.
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