CN114233496B - Cold start oil injection method and device for diesel engine and electronic equipment - Google Patents
Cold start oil injection method and device for diesel engine and electronic equipment Download PDFInfo
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- CN114233496B CN114233496B CN202111517534.8A CN202111517534A CN114233496B CN 114233496 B CN114233496 B CN 114233496B CN 202111517534 A CN202111517534 A CN 202111517534A CN 114233496 B CN114233496 B CN 114233496B
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- 238000002347 injection Methods 0.000 title claims abstract description 77
- 239000007924 injection Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 57
- 239000000446 fuel Substances 0.000 claims abstract description 38
- 239000007858 starting material Substances 0.000 claims description 11
- 239000003921 oil Substances 0.000 description 52
- 239000002283 diesel fuel Substances 0.000 description 14
- 239000000243 solution Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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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
- F02D41/064—Introducing corrections for particular operating conditions for engine starting or warming up for starting at cold start
-
- 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
- F02D41/3011—Controlling fuel injection according to or using specific or several modes of combustion
- F02D41/3017—Controlling fuel injection according to or using specific or several modes of combustion characterised by the mode(s) being used
-
- 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
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The application provides a diesel engine cold start oil injection method and device and electronic equipment, wherein the method comprises the following steps: acquiring the ambient temperature and voltage of the diesel engine; judging whether the diesel engine meets preset conventional starting conditions or not according to the ambient temperature and the voltage; if not, determining a cold start strategy according to a preset temperature range where the ambient temperature is located; wherein, the cold start strategies corresponding to different preset temperature ranges are different; therefore, the cold starting capability of the electric control diesel engine is improved by adding the fuel injection strategy in the cold starting process on the basis of not changing any structure and hardware of the engine.
Description
Technical Field
The application belongs to the technical field of cold start, and particularly relates to a diesel engine cold start oil injection method and device and electronic equipment.
Background
In winter, especially in severe cold regions, the intake air temperature is lowered due to low ambient temperature, the capacity of the storage battery is lowered, and the viscosity of the lubricating oil is increased, which causes difficult starting of the diesel engine.
In order to improve cold start performance of a diesel engine, many studies have been made by the industry, but when the diesel engine is started under low temperature conditions, the temperature and pressure of a compression end working medium are low due to low air inlet temperature and low combustion chamber temperature. Meanwhile, the piston movement speed is lower during starting, so that the air leakage loss is increased, and the temperature of the compression end point is reduced, so that the atomization and ignition conditions of the fuel oil are worsened, and the cold starting of the diesel engine is difficult.
In other words, in the cold start process of the diesel engine, the temperature in the cylinder is very low, diesel oil is difficult to ignite, and fuel injection according to a conventional fuel injection strategy can lead to the difficulty that the cold start is aggravated by the fact that unburned diesel oil is liquefied in the cylinder, so that vicious circulation is formed, and the vehicle is difficult to start.
Disclosure of Invention
In view of the above, the present application aims to provide a diesel engine cold start oil injection method and device, and an electronic device, which are used for increasing the cold start capability of an electronic control diesel engine by increasing a fuel injection strategy in the cold start process on the basis of not changing any structure and hardware of the engine.
The first aspect of the application discloses a diesel engine cold start oil injection method, which comprises the following steps:
acquiring the ambient temperature and voltage of the diesel engine;
judging whether the diesel engine meets preset conventional starting conditions or not according to the ambient temperature and the voltage;
if not, determining a cold start strategy according to a preset temperature range where the ambient temperature is located;
wherein, the preset temperature range includes: the first preset temperature range, the second preset temperature range and the third preset temperature range; the cold start strategies corresponding to the first preset temperature range, the second preset temperature range and the third preset temperature range are different.
Optionally, in the above method for cold starting of a diesel engine, determining whether the diesel engine meets a preset conventional starting condition according to the ambient temperature and the voltage includes:
judging whether the ambient temperature is less than a first preset temperature or not;
if the ambient temperature is less than the first preset temperature, judging whether the voltage is greater than a preset voltage or not; if yes, judging that the diesel engine does not meet preset conventional starting conditions; if not, judging that the diesel engine meets the preset conventional starting condition;
and if the ambient temperature is greater than the first preset temperature, judging that the diesel engine meets preset conventional starting conditions.
Optionally, in the above method for cold start of diesel engine, before determining the cold start strategy according to the preset temperature range where the ambient temperature is located, the method further includes:
the rotational speed of an engine in the diesel engine is detected.
Optionally, in the method for cold starting of a diesel engine, determining the cold starting strategy according to the preset temperature range in which the ambient temperature is located includes:
the diesel engine is not injected in a preset time after being started, and a starter of the diesel engine drives the engine to idle, so that the temperature in an engine cylinder is increased;
after the preset time, adopting a cold start oil injection strategy until the rotating speed of the engine reaches a preset duty ratio range of normal idling, and adopting a preset normal oil injection strategy; the cold start oil injection strategy is to inject a first preset time according to a first preset oil amount, wait for a second preset time and cycle to and fro;
wherein, the preset time and the preset duty ratio range corresponding to different temperature ranges are different.
Optionally, in the diesel engine cold start oil injection method, the preset time corresponding to the temperature range with lower temperature is longer than the preset time corresponding to the temperature range with higher temperature;
the preset duty cycle range with a lower temperature is greater than the preset duty cycle range with a higher temperature.
The second aspect of the application discloses a diesel engine cold start oil injection device, comprising:
the acquisition unit is used for acquiring the ambient temperature and the voltage of the diesel engine;
the judging unit is used for judging whether the diesel engine meets preset conventional starting conditions or not according to the ambient temperature and the voltage;
the cold start unit is used for determining a cold start strategy according to a preset temperature range where the ambient temperature is located if the judging result of the judging unit is negative;
wherein, the preset temperature range includes: the first preset temperature range, the second preset temperature range and the third preset temperature range; the cold start strategies corresponding to the first preset temperature range, the second preset temperature range and the third preset temperature range are different.
Optionally, in the cold start fuel injection device for a diesel engine, the judging unit is configured to judge, according to the ambient temperature and the voltage, whether the diesel engine meets a preset normal start condition, and specifically configured to:
judging whether the ambient temperature is less than a first preset temperature or not;
if the ambient temperature is less than the first preset temperature, judging whether the voltage is greater than a preset voltage or not; if yes, judging that the diesel engine does not meet preset conventional starting conditions; if not, judging that the diesel engine meets the preset conventional starting condition;
and if the ambient temperature is greater than the first preset temperature, judging that the diesel engine meets preset conventional starting conditions.
Optionally, in the cold start fuel injection device of a diesel engine, the obtaining unit is further configured to:
the rotational speed of an engine in the diesel engine is detected.
Optionally, in the diesel engine cold start fuel injection device, the cold start unit is configured to determine a cold start strategy according to a preset temperature range where the ambient temperature is located, where the cold start unit is specifically configured to:
the diesel engine is not injected in a preset time after being started, and a starter of the diesel engine drives the engine to idle, so that the temperature in an engine cylinder is increased;
after the preset time, adopting a cold start oil injection strategy until the rotating speed of the engine reaches a preset duty ratio range of normal idling, and adopting a preset normal oil injection strategy; the cold start oil injection strategy is to inject a first preset time according to a first preset oil amount, wait for a second preset time and cycle to and fro;
wherein, the preset time and the preset duty ratio range corresponding to the temperature range are different.
The third aspect of the present application discloses an electronic device, comprising:
one or more processors;
a storage device having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the diesel cold start fuel injection method according to any one of the first aspects of the present application.
As can be seen from the technical scheme, the oil injection method for cold start of the diesel engine provided by the application comprises the following steps: acquiring the ambient temperature and voltage of the diesel engine; judging whether the diesel engine meets preset conventional starting conditions or not according to the ambient temperature and the voltage; if not, determining a cold start strategy according to a preset temperature range where the ambient temperature is located; wherein, the cold start strategies corresponding to different preset temperature ranges are different; therefore, the cold starting capability of the electric control diesel engine is improved by adding the fuel injection strategy in the cold starting process on the basis of not changing any structure and hardware of the engine.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a cold start fuel injection method for a diesel engine according to an embodiment of the present application;
FIG. 2 is a flow chart of another cold start fuel injection method for a diesel engine according to an embodiment of the present application;
FIG. 3 is a flow chart of another cold start fuel injection method for a diesel engine according to an embodiment of the present application;
FIG. 4 is a flow chart of another cold start fuel injection method for a diesel engine according to an embodiment of the present application;
FIG. 5 is a flow chart of another cold start fuel injection method for a diesel engine according to an embodiment of the present application;
fig. 6 is a schematic diagram of a cold start fuel injection device of a diesel engine according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the application provides a diesel engine cold start oil injection method, which is used for solving the problems that in the prior art, in the cold start process of a diesel engine, the temperature in a cylinder is very low, diesel oil is difficult to ignite, and according to a conventional oil injection strategy, the diesel oil is injected, so that unburned diesel oil is liquefied in the cylinder to exacerbate the difficulty of cold start, thereby forming vicious circle and being difficult to start a vehicle.
Referring to fig. 1, the cold start fuel injection method of the diesel engine includes:
s101, acquiring the ambient temperature and the voltage of the diesel engine.
The ambient temperature and voltage may be obtained by a sensor. Specifically, the ambient temperature of the diesel engine is collected through a temperature sensor; and collecting the voltage of the diesel engine through a voltage sensor.
The voltage of the diesel engine may be the voltage of a battery powered by the diesel engine. Of course, other values may be adopted, and are not described in detail herein, as the actual situation may be required, and all values are within the protection scope of the present application.
S102, judging whether the diesel engine meets preset conventional starting conditions according to the ambient temperature and the voltage.
It should be noted that, when the diesel engine meets the preset normal starting condition, the normal starting strategy is directly adopted, and when the diesel engine does not meet the preset normal starting condition, the cold starting strategy is required.
The conventional starting strategy is mainly normal to the following cold starting strategy, and if the vehicle is started, normal fuel injection and normal diesel oil injection are carried out as in the conventional environment, the electric control diesel engine only needs to calibrate the fuel injection quantity, so that the fuel injection quantity is recovered to a certain fuel injection quantity and the calibration of alternate fuel injection is canceled after the condition is met.
Therefore, if the diesel engine does not meet the preset normal start condition, step S103 is performed.
S103, determining a cold start strategy according to a preset temperature range where the ambient temperature is located.
Wherein, preset temperature range includes: the first preset temperature range, the second preset temperature range and the third preset temperature range; the cold start strategies corresponding to the first preset temperature range, the second preset temperature range and the third preset temperature range are different.
Note that, the cold start is: the engine is started under the condition of low water temperature and low engine oil temperature; that is, the cold start strategy is: and (3) starting the engine under the condition of low water temperature and low engine oil temperature.
Specifically, when the ambient temperature is within a first preset temperature range, determining a first cold start strategy; determining a second cold start strategy when the ambient temperature is within a second preset temperature range; and determining a third cold start strategy when the ambient temperature is within a third preset temperature range.
The first preset temperature range, the second preset temperature range, and the third preset temperature range may be adjacent and non-overlapping ranges. That is, the first preset temperature range, the second preset temperature range, and the third preset temperature range are combined into one continuous range.
Specifically, the first preset temperature range may be a range in which the upper limit value is-30 ℃ and the lower limit value is-35 ℃; the second preset temperature range may be a range having an upper limit of-35 ℃ and a lower limit of-40 ℃; the third preset temperature range may be a range in which the upper limit value is infinitely small and the lower limit value is-40 ℃.
Of course, the method is not limited to the above examples, and selection of each preset temperature range is not repeated here, and the method is only required to be within the protection scope of the present application according to actual conditions.
In the embodiment, the ambient temperature and voltage of the diesel engine are obtained; judging whether the diesel engine meets preset conventional starting conditions or not according to the ambient temperature and the voltage; if not, determining a cold start strategy according to a preset temperature range where the ambient temperature is located; wherein, the cold start strategies corresponding to different preset temperature ranges are different; therefore, the cold starting capability of the electric control diesel engine is improved by adding the fuel injection strategy in the cold starting process on the basis of not changing any structure and hardware of the engine.
In practical application, referring to fig. 2, step S102, determining whether the diesel engine meets the preset normal starting condition according to the ambient temperature and the voltage includes:
s201, judging whether the ambient temperature is smaller than a first preset temperature.
If the ambient temperature is less than the first preset temperature, step S202 is executed; if the ambient temperature is greater than the first preset temperature, step S204 is performed.
S202, judging whether the voltage is larger than a preset voltage.
If yes, go to step S203; if not, step S204 is performed.
S203, judging that the diesel engine does not meet preset normal starting conditions.
S204, judging that the diesel engine meets preset normal starting conditions.
Specifically, the first preset temperature may be-30 ℃, and of course, may also be other values, which are not described in detail herein, and are all within the scope of the present application.
The preset voltage is not particularly limited herein, as long as the preset voltage can be the characteristic voltage, and is within the protection scope of the present application.
That is, firstly judging whether the ambient temperature is lower than-30 ℃, and if the ambient temperature does not meet the conditions, carrying out according to a conventional starting strategy; when the ambient temperature is lower than-30 ℃, judging the voltage, if the power supply voltage is lower, in order to ensure that the voltage requirement of the starter dragging the engine can be met, the method is carried out according to a conventional starting strategy, and the starting opportunity is prevented from being wasted due to low voltage.
In practical application, as shown in fig. 3, in step S103, before determining the cold start strategy according to the preset temperature range where the ambient temperature is located, the method further includes:
s301, detecting the rotation speed of an engine in the diesel engine.
The rotation speed of the engine may be detected by a rotation speed sensor, or may be calculated.
The specific process of detecting the rotation speed of the engine in the diesel engine is not repeated here, and the specific process is required according to actual conditions and is within the protection scope of the application.
In practical application, referring to fig. 4, step S103, determining a cold start strategy according to a preset temperature range where an ambient temperature is located includes:
s401, fuel is not injected in a preset time after the diesel engine is started, and a starter of the diesel engine drives the engine to idle, so that the temperature in a cylinder of the engine is increased.
The diesel engine is started, namely oil injection is delayed after ignition of a key, only work is performed on air, the function of heating air inlet is fully utilized, and the temperature in a cylinder is increased.
The specific value of the preset time is not repeated here, and can be determined according to actual conditions, and the specific value is within the protection scope of the application.
In addition, the preset time corresponding to different temperature ranges is different. That is, the preset time corresponding to the first preset temperature range is T1, the preset time corresponding to the second preset temperature range is T2, and the preset time corresponding to the third preset temperature range is T3; t1, T2 and T3 are not equal to each other.
S402, after a preset time, adopting a cold start oil injection strategy until the rotating speed of the engine reaches a preset duty ratio range of normal idling, and adopting a preset normal oil injection strategy.
The cold start oil injection strategy is to spray a first preset time according to a first preset oil quantity, wait a second preset time and cycle. Specifically, the first preset time is sprayed according to the first preset oil quantity, the second preset time is waited, the first preset time is sprayed by executing the first preset oil quantity, the second preset time is waited, and the like.
Wherein, the preset duty ratio ranges corresponding to different temperature ranges are different. That is, the preset duty ratio range corresponding to the first preset temperature range is D1, the preset duty ratio range corresponding to the second preset temperature range is D2, and the preset duty ratio range corresponding to the third preset temperature range is D3; d1, D2 and D3 are not equal to each other.
It should be noted that, the first preset time and the second preset time are used for increasing the cold start capability, the determination standard is that the faster and better the start is when the temperature is low, the better the start can be performed at the lower temperature, and the test result shows that the effect is achieved.
The first preset oil amount is a smaller oil amount than the oil amount under normal start. The small oil quantity interval oil injection can provide heat at a lower dragging rotating speed, reduce the amount of unburned diesel oil, and empty the unburned diesel oil at interval time.
In practical application, the preset time corresponding to the temperature range with lower temperature is longer than the preset time corresponding to the temperature range with higher temperature;
the preset duty cycle range with a lower temperature is greater than the preset duty cycle range with a higher temperature.
In the embodiment, the cold starting capacity of the diesel engine is optimized by adding a fuel injection strategy, and the engine is not required to be changed in structure; has no influence on the actual use experience of the user.
As shown in fig. 5, the method for injecting fuel for cold start of the diesel engine is described in a practical application scenario:
when the T15 is electrified, detecting the ambient temperature and the voltage value of the storage battery, firstly judging whether the ambient temperature is lower than minus 30 ℃, and if not, judging the voltage when the ambient temperature is lower than minus 30 ℃ according to a conventional starting strategy, if so, judging the voltage to be lower, and in order to ensure that the voltage requirement of a starter dragging engine can be met, according to the conventional starting strategy, avoiding the starting opportunity from being wasted due to low voltage.
When the environment temperature is lower than minus 30 ℃ and the power supply voltage is normal, different starting strategies are entered based on the environment temperature:
1. the temperature of the environment with the temperature of minus 35 ℃ is less than or equal to minus 30 ℃, the oil is not injected in the first 4 seconds after the ignition of the key, the engine is driven by the starter to idle, the compressed air is used for doing work, the air intake is fully utilized for heating, and the temperature in the engine cylinder is increased; after 4s, injecting the small oil quantity for t1s, avoiding increasing excessive unburned diesel oil under the conditions of low dragging rotating speed and low in-cylinder temperature, after stopping injection, injecting the small oil quantity for t1s again after an interval of t2s, continuously lifting the in-cylinder temperature and evacuating the unburned diesel oil in the previous cycle, repeating the interval small oil quantity injection strategy, and injecting the fuel normally until the rotating speed of the engine reaches 30% -35% of the normal idling speed.
2. The temperature of the environment at minus 40 ℃ is less than or equal to minus 35 ℃, the fuel is not injected in the first 5 seconds after the key is ignited, the engine is driven by the starter to idle, the compressed air is used for doing work, the air intake is fully utilized for heating, and the temperature in the engine cylinder is increased; after 5s, injecting the small oil quantity for t1s, avoiding increasing excessive unburned diesel oil under the conditions of low dragging rotating speed and low in-cylinder temperature, after stopping injection, injecting the small oil quantity for t1s again after an interval of t2s, continuously lifting the in-cylinder temperature and evacuating the unburned diesel oil in the previous cycle, repeating the interval small oil quantity injection strategy, and injecting the fuel normally until the rotating speed of the engine reaches 35-40% of normal idling.
3. The T environmental temperature is less than-40 ℃, the oil is not injected in the first 6s after the key is ignited, the engine is driven by the starter to idle, the compressed air is used for doing work, the air intake is fully utilized for heating, and the temperature in the engine cylinder is increased; after 6s, injecting the small oil quantity for t1s, avoiding increasing excessive unburned diesel oil under the conditions of low dragging rotating speed and low in-cylinder temperature, after stopping injection, injecting the small oil quantity for t1s again after an interval of t2s, continuously lifting the in-cylinder temperature and evacuating the unburned diesel oil in the previous cycle, repeating the interval small oil quantity injection strategy, and injecting the fuel normally until the rotating speed of the engine reaches 35-40% of normal idling.
It should be noted that, normal oil injection is: the diesel engine is controlled to calibrate the oil injection quantity, so that the diesel engine can recover to a certain oil injection quantity and cancel the calibration of oil injection at intervals after the condition is met.
The application further provides a cold start oil injection device of the diesel engine.
Referring to fig. 6, the cold start fuel injection device of the diesel engine includes:
an acquisition unit 10 for acquiring the ambient temperature and voltage of the diesel engine.
The judging unit 20 is configured to judge whether the diesel engine meets a preset normal starting condition according to the ambient temperature and the voltage.
The cold start unit 30 is configured to determine a cold start strategy according to a preset temperature range in which the ambient temperature is located if the determination result of the determination unit 20 is negative;
wherein, preset temperature range includes: the first preset temperature range, the second preset temperature range and the third preset temperature range; the cold start strategies corresponding to the first preset temperature range, the second preset temperature range and the third preset temperature range are different.
The details of the working process and principle of each unit are referred to the oil injection method for cold start of the diesel engine provided by the above embodiment, and are not described in detail herein, and are all within the protection scope of the present application.
In the present embodiment, the acquisition unit 10 acquires the ambient temperature and voltage of the diesel engine; the judging unit 20 judges whether the diesel engine meets preset normal starting conditions according to the ambient temperature and the voltage; the cold start unit 30 determines a cold start strategy according to a preset temperature range in which the ambient temperature is located if the judgment result of the judgment unit 20 is negative; wherein, the cold start strategies corresponding to different preset temperature ranges are different; therefore, the cold starting capability of the electric control diesel engine is improved by adding the fuel injection strategy in the cold starting process on the basis of not changing any structure and hardware of the engine.
In practical applications, the determining unit 20 is configured to determine, according to the ambient temperature and the voltage, whether the diesel engine meets a preset normal starting condition, and is specifically configured to:
and judging whether the ambient temperature is less than a first preset temperature.
If the ambient temperature is less than the first preset temperature, judging whether the voltage is greater than the preset voltage; if yes, judging that the diesel engine does not meet preset conventional starting conditions; if not, judging that the diesel engine meets the preset conventional starting condition.
If the ambient temperature is higher than the first preset temperature, judging that the diesel engine meets preset conventional starting conditions.
In practical application, the acquiring unit 10 is further configured to:
the rotational speed of the engine in the diesel engine is detected.
In practical applications, the cold start unit 30 is configured to determine a cold start strategy according to a preset temperature range in which an ambient temperature is located, and is specifically configured to:
the diesel engine is not injected in the preset time after being started, and the starter of the diesel engine drives the engine to idle, so that the temperature in the engine cylinder is increased.
After the preset time, adopting a cold start oil injection strategy until the rotating speed of the engine reaches a preset duty ratio range of normal idle speed, and adopting a preset normal oil injection strategy; the cold start oil injection strategy is to spray a first preset time according to a first preset oil quantity, wait a second preset time and cycle.
Wherein, the preset time and the preset duty ratio range corresponding to the temperature range are different.
The details of the working process and principle of each unit are referred to the cold start oil injection method of the diesel engine provided by the above embodiment, and are not described in detail herein, and are all within the protection scope of the present application.
Another embodiment of the present application provides an electronic device, including:
one or more processors.
A storage device having one or more programs stored thereon.
The one or more programs, when executed by the one or more processors, cause the one or more processors to implement the diesel cold start fuel injection method as provided in any of the embodiments above.
The specific working process and principle of the processor refer to the cold start oil injection method of the diesel engine provided by the embodiment for details, and are not described in detail herein, and are all within the protection scope of the application.
Features described in the embodiments in this specification may be replaced or combined, and identical and similar parts of the embodiments may be referred to each other, where each embodiment focuses on differences from other embodiments. In particular, for a system or system embodiment, since it is substantially similar to a method embodiment, the description is relatively simple, with reference to the description of the method embodiment being made in part. The systems and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present application without undue burden.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method of injecting fuel for a cold start of a diesel engine, comprising:
acquiring the ambient temperature and voltage of the diesel engine;
judging whether the diesel engine meets preset conventional starting conditions or not according to the ambient temperature and the voltage;
if not, determining a cold start strategy according to a preset temperature range where the ambient temperature is located; the process of determining the cold start strategy according to the preset temperature range where the ambient temperature is located comprises the following steps: the diesel engine is not injected in a preset time after being started, and the starter of the diesel engine drives the engine to idle, so that the temperature in the engine cylinder is increased; after the preset time, adopting a cold start oil injection strategy until the rotating speed of the engine reaches a preset duty ratio range of normal idling, and adopting a preset normal oil injection strategy; the cold start oil injection strategy is to inject a first preset time according to a first preset oil amount, wait for a second preset time and cycle to and fro; the preset time and the preset duty ratio range corresponding to different temperature ranges are different;
wherein, the preset temperature range includes: the first preset temperature range, the second preset temperature range and the third preset temperature range; the cold start strategies corresponding to the first preset temperature range, the second preset temperature range and the third preset temperature range are different.
2. The method for cold start fuel injection of a diesel engine according to claim 1, wherein determining whether the diesel engine satisfies a preset normal start condition according to the ambient temperature and the voltage comprises:
judging whether the ambient temperature is less than a first preset temperature or not;
if the ambient temperature is less than the first preset temperature, judging whether the voltage is greater than a preset voltage or not; if yes, judging that the diesel engine does not meet preset conventional starting conditions; if not, judging that the diesel engine meets the preset conventional starting condition;
and if the ambient temperature is greater than the first preset temperature, judging that the diesel engine meets preset conventional starting conditions.
3. The method of claim 1, further comprising, prior to determining a cold start strategy based on a preset temperature range in which the ambient temperature is located:
the rotational speed of an engine in the diesel engine is detected.
4. The method for cold start of diesel engine according to claim 1, wherein the preset time corresponding to the temperature range having a lower temperature is longer than the preset time corresponding to the temperature range having a higher temperature;
the preset duty cycle range with a lower temperature is greater than the preset duty cycle range with a higher temperature.
5. A diesel cold start fuel injection device, comprising:
the acquisition unit is used for acquiring the ambient temperature and the voltage of the diesel engine;
the judging unit is used for judging whether the diesel engine meets preset conventional starting conditions or not according to the ambient temperature and the voltage;
the cold start unit is used for determining a cold start strategy according to a preset temperature range where the ambient temperature is located if the judging result of the judging unit is negative; the process of determining the cold start strategy according to the preset temperature range where the ambient temperature is located comprises the following steps: the diesel engine is not injected in a preset time after being started, and the starter of the diesel engine drives the engine to idle, so that the temperature in the engine cylinder is increased; after the preset time, adopting a cold start oil injection strategy until the rotating speed of the engine reaches a preset duty ratio range of normal idling, and adopting a preset normal oil injection strategy; the cold start oil injection strategy is to inject a first preset time according to a first preset oil amount, wait for a second preset time and cycle to and fro; the preset time and the preset duty ratio range corresponding to different temperature ranges are different;
wherein, the preset temperature range includes: the first preset temperature range, the second preset temperature range and the third preset temperature range; the cold start strategies corresponding to the first preset temperature range, the second preset temperature range and the third preset temperature range are different.
6. The cold start fuel injection device of claim 5, wherein the judging unit is configured to judge whether the diesel engine meets a preset normal start condition according to the ambient temperature and the voltage, specifically configured to:
judging whether the ambient temperature is less than a first preset temperature or not;
if the ambient temperature is less than the first preset temperature, judging whether the voltage is greater than a preset voltage or not; if yes, judging that the diesel engine does not meet preset conventional starting conditions; if not, judging that the diesel engine meets the preset conventional starting condition;
and if the ambient temperature is greater than the first preset temperature, judging that the diesel engine meets preset conventional starting conditions.
7. The diesel cold start fuel injection device of claim 5, wherein the acquisition unit is further configured to:
the rotational speed of an engine in the diesel engine is detected.
8. An electronic device, comprising:
one or more processors;
a storage device having one or more programs stored thereon;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the diesel cold start fuel injection method of any one of claims 1-4.
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