CN118815607A - Diesel engine cold start control method and system, and electronic equipment - Google Patents
Diesel engine cold start control method and system, and electronic equipment Download PDFInfo
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- CN118815607A CN118815607A CN202411169086.0A CN202411169086A CN118815607A CN 118815607 A CN118815607 A CN 118815607A CN 202411169086 A CN202411169086 A CN 202411169086A CN 118815607 A CN118815607 A CN 118815607A
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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
- F02D41/008—Controlling each cylinder individually
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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
- F02D31/00—Use of speed-sensing governors to control combustion engines, not otherwise provided for
- F02D31/001—Electric control of rotation speed
- F02D31/007—Electric control of rotation speed controlling fuel supply
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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
- F02D41/0205—Circuit arrangements for generating control signals using an auxiliary engine speed control
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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
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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
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- 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)
Abstract
The application relates to the field of diesel engines, and provides a cold start control method and system for a diesel engine and electronic equipment, wherein the method comprises the following steps: obtaining the rotating speed of the diesel engine at the moment of N times of oil injection nearest to the current moment; calculating the speed increasing rate of the diesel engine based on the obtained N diesel engine speeds; judging whether the rotation speed increasing rate meets a first preset condition or not; and stopping oil supply to at least one cylinder which is supplied with oil in the diesel engine if the first preset condition is met. The method and the device are used for solving the defects that the speed of the diesel engine is increased too fast when the diesel engine is started in a cold mode, the speed increase rate is not matched with the temperature increase rate of the diesel engine, stable work of the diesel engine is possibly affected, severe fluctuation of the speed of the diesel engine and frequent fire are caused, the speed increase rate can be calculated based on the acquired speed of the diesel engine, and if the speed increase rate meets the set condition, oil supply to a cylinder is stopped, so that the speed increase of the diesel engine is stable, and the problems of severe fluctuation of the speed and the fire of the diesel engine are reduced.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to a cold start control method and system for a diesel engine and electronic equipment.
Background
The diesel engine is low in temperature during cold start, incomplete fuel combustion may cause poor ignition stability of the diesel engine, and easy flameout.
In the related art, an effective control means for the rotating speed in the cold start process is lacked, so that the rotating speed of the diesel engine is increased too fast in the cold start process, the rotating speed increasing rate is not matched with the heating speed of the diesel engine, further the stable work of the diesel engine is possibly influenced, and the problems of severe fluctuation of the rotating speed of the diesel engine, frequent fire and the like occur.
Disclosure of Invention
The application provides a cold start control method and system of a diesel engine and electronic equipment, which are used for solving the defects that the stable work of the diesel engine is possibly influenced and the severe fluctuation of the rotation speed and frequent fire of the diesel engine occur due to the fact that the rotation speed of the diesel engine is excessively fast in cold start and the rotation speed rising rate is not matched with the temperature rising rate of the diesel engine.
The invention provides a cold start control method of a diesel engine, which comprises the following steps:
obtaining the rotating speed of the diesel engine at the moment of N times of oil injection nearest to the current moment;
Calculating the rotational speed increasing rate of the diesel engine based on the obtained N rotational speeds of the diesel engine;
judging whether the rotation speed increasing rate meets a first preset condition or not;
And stopping oil supply to at least one cylinder supplied with oil in the diesel engine if the first preset condition is met.
According to the method for controlling cold start of diesel engine provided by the invention, the judging whether the rotation speed increasing rate meets the first preset condition comprises the following steps:
comparing the rate of increase of rotational speed to a first rate of increase threshold;
And if the rotation speed increasing rate is larger than the first rotation speed increasing rate threshold value and at least one cylinder which is supplied with oil exists in the diesel engine, determining that the rotation speed increasing rate meets the first preset condition.
According to the cold start control method of the diesel engine provided by the invention, the method for stopping the oil supply to at least one cylinder supplied with oil in the diesel engine further comprises the following steps:
And judging whether the rotating speed of the diesel engine is at a stable level, and if the rotating speed of the diesel engine is not at the stable level, returning to and executing the step of obtaining the rotating speed of the diesel engine at the moment of N times of oil injection closest to the current moment.
The cold start control method of the diesel engine provided by the invention further comprises the following steps:
judging whether the rotation speed increasing rate meets a second preset condition or not;
And if the second preset condition is met, re-supplying oil to at least one cylinder of the diesel engine, wherein the cylinder is stopped from being supplied with oil.
According to the method for controlling cold start of diesel engine provided by the invention, the judging whether the rotation speed increasing rate meets the second preset condition comprises the following steps:
comparing the rate of increase of rotational speed to a second rate of increase threshold;
and if the rotation speed increasing rate is smaller than the second rotation speed increasing rate threshold value and at least one cylinder which is stopped from being supplied with oil exists in the diesel engine, determining that the rotation speed increasing rate meets the second preset condition.
The cold start control method of the diesel engine provided by the invention further comprises the following steps:
Judging whether the rotation speed increasing rate meets a third preset condition or not;
If the third preset condition is met, continuously calculating the rotation speed increasing rate of the diesel engine based on the obtained rotation speed of the diesel engine, and judging whether the rotation speed increasing rate meets the third preset condition or not until the diesel engine is started stably.
According to the method for controlling cold start of diesel engine provided by the invention, the judging whether the rotation speed increasing rate meets the third preset condition comprises the following steps:
Comparing the rate of increase of the rotational speed with the first rate of increase threshold and the second rate of increase threshold;
And if the rotation speed increasing rate is smaller than or equal to the first rotation speed increasing rate threshold and is larger than or equal to the second rotation speed increasing rate threshold, determining that the rotation speed increasing rate meets the third preset condition.
According to the cold start control method of the diesel engine provided by the invention, the method for obtaining the diesel engine rotating speed of the diesel engine at the moment of N times of oil injection closest to the current moment comprises the following steps:
and receiving a trigger signal after the diesel engine finishes oil injection to the cylinder, and obtaining the rotational speed of the diesel engine at the latest three oil injection moments after the oil injection completion moment.
The invention also provides a cold start control system of the diesel engine, which comprises:
The rotating speed acquisition module is used for acquiring the rotating speed of the diesel engine at the moment of N times of oil injection nearest to the current moment;
A rotation speed calculation module for calculating a rotation speed increasing rate of the diesel engine based on the obtained N diesel engine rotation speeds;
The judging module is used for judging whether the rotation speed increasing rate meets a first preset condition or not;
and the oil supply stopping module is used for stopping oil supply to at least one cylinder supplied with oil in the diesel engine if the first preset condition is met.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the cold start control method of any diesel engine when executing the program.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a diesel engine cold start control method as any one of the above.
The invention also provides a computer program product comprising a computer program which when executed by a processor implements a diesel engine cold start control method as described above.
According to the diesel engine cold start control method provided by the application, the N times of rotation speed signals of the diesel engine can be obtained, the rotation speed rising rate of the diesel engine can be calculated and determined based on the obtained rotation speed signals, if the rotation speed rising rate accords with preset conditions, the problems that the current rotation speed rising rate of the diesel engine is too fast, the rotation speed fluctuation is large and the diesel engine is in fire can be caused, at the moment, the oil supply can be stopped for at least one cylinder which is supplied with oil, the power of the diesel engine can be reduced after the oil supply is stopped, the purpose of reducing the rotation speed rising rate is achieved, the rotation speed can be stably increased during the cold start of the diesel engine, and the stability and the safety of the cold start process are improved.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a rotational speed change process in a start-up process according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the relationship between the rotational speed of a diesel engine and the position of a piston according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a cold start control method of a diesel engine according to an embodiment of the present invention;
FIG. 4 is a second flow chart of a cold start control method of a diesel engine according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a cold start control system of a diesel engine according to an embodiment of the present invention;
Fig. 6 is a schematic diagram of an entity structure of an electronic device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the starting process of the diesel engine, when the ignition in the cylinder is too late, the whole ignition process occurs in the descending stage of the piston, and the indication work of the diesel engine is very low. When the ignition time is 30 degrees CA later than the upper dead point, the indication work of the cycle is reduced sharply, and the thermal moment is reduced obviously, so the ignition process before the upper dead point is 30 degrees CA is regarded as an effective working range.
Fig. 1 is a schematic diagram of a rotational speed change process in a starting process according to an embodiment of the present invention.
Under cold start conditions, the in-cylinder thermal stress state has a significant impact on the fire lag phase. As can be seen from a comparison of the rotational speed variation between the normal start and the cold start in fig. 1, the rotational speed fluctuation of the diesel engine is very severe under the cold start condition, and in this stage, the ignition of the diesel engine is very unstable, and the misfire phenomenon occurs frequently, which results in that the thermal moment of the diesel engine is sometimes absent, and the dynamic moment matching is seriously unbalanced.
Fig. 2 is a schematic diagram of a relationship between a rotational speed of a diesel engine and a piston position according to an embodiment of the present invention.
As shown in fig. 2, in the case of a diesel engine, the ignition and flame-retardant period in terms of crank angle is related to the rotational speed of the diesel engine as follows: the ignition and stagnation period recorded by the crank angle is shortened and then increased along with the increase of the rotation speed of the diesel engine, and the ignition start point is delayed when the rotation speed of the diesel engine is too high, because the change of the thermal force condition in the cylinder is reduced at the high rotation speed of the diesel engine, the stagnation period recorded by the time is almost unchanged, but the ignition start point is pushed after the ignition start point is recorded by the crank angle after the rotation speed is multiplied. Under the working condition that the thermal state of the diesel engine is good, the flame-retarding period is short enough, and the diesel engine can stably do work and output thermal power moment as long as the diesel engine is ensured to be above the critical rotating speed. When the thermal state of a diesel engine is poor, the flame-retardant period is too long, and the change of the thermal state is a slower process compared with the working cycle of the diesel engine, so when the thermal state is still low (namely the cooling water temperature, the wall temperature of a combustion chamber is low and the gap between piston rings is large), the too high rotation speed can cause the ignition point to delay to be behind the effective working interval. Therefore, in a low thermal state, an effective working speed interval exists, and the diesel engine can stably output the thermal torque only in the speed, namely when the speed increasing rate of the diesel engine is too high, the speed increasing rate of the diesel engine exceeds the improvement speed of the thermal state, and the phenomena of sudden drop of the thermal torque and severe fluctuation of the speed of the diesel engine can occur.
Based on the control method, the control method is applied to the cold start process of the diesel engine, and the rotation speed rising rate in the cold start process can be effectively controlled.
Fig. 3 is a schematic flow chart of a cold start control method of a diesel engine according to an embodiment of the present invention.
As shown in fig. 3, the present embodiment provides a cold start control method of a diesel engine, including:
Step 301, obtaining the diesel engine rotation speed of the diesel engine at N times of oil injection time closest to the current time;
Step 302, calculating the rotation speed increasing rate of the diesel engine based on the obtained N diesel engine rotation speeds;
Step 303, judging whether the rotation speed increasing rate meets a first preset condition;
And step 304, stopping oil supply to at least one cylinder which is supplied with oil in the diesel engine if the first preset condition is met.
In practical application, the triggering timing of the control method disclosed in this embodiment may be the timing when the cold start of the diesel engine starts, and the triggering signal that is triggered by the operator may be the timing when the cold start starts, that is, the triggering timing of the control method in this embodiment.
In this embodiment, the rotation speed of the diesel engine may be determined by detecting the output shaft of the diesel engine, and the rotation speed of the diesel engine may be detected after each injection is completed.
In implementation, in step 301, the diesel engine rotation speed of the diesel engine at the N injection moments closest to the current moment may be obtained after each injection of the diesel engine is completed, or the diesel engine rotation speed of the diesel engine at the N injection moments closest to the current moment may be obtained at each set time interval.
The diesel engine rotation speed of the diesel engine at the moment of the N nearest to the current moment is obtained after each injection is completed, and N is 3, for example, the injection can be performed once every 5 seconds, for example, the first injection is performed at the 5 th second, the second injection is performed at the 10 th second, the third injection is performed at the 15 th second, the fourth injection is performed at the 20 th second, the fifth injection is performed at the 25 th second, similarly, the rotational speed of the diesel engine may be obtained 3 times after each injection is completed, for example, the rotational speeds of the diesel engine after the first injection, the second injection, and the third injection are obtained when the 10 th second injection is completed, and the rotational speeds of the diesel engine after the second injection, the third injection, and the third injection are obtained when the 15 th second injection is completed.
In practical applications, when calculating the rotation speed increasing rate based on the rotation speed of the diesel engine, the rotation speed increasing rate between two adjacent collected rotation speeds of the diesel engine may be calculated first, then the rotation speed increasing rate may be obtained by dividing the last rotation speed increasing rate by the last rotation speed increasing rate, and still taking N as 3 as an example, the obtained 3 rotation speeds of the diesel engine may be the rotation speed after the first injection, the rotation speed after the second injection and the rotation speed after the third injection, then the first rotation speed increasing rate may be calculated based on the rotation speed after the first injection and the rotation speed after the second injection, the second rotation speed increasing rate may be calculated based on the rotation speed after the second injection and the rotation speed after the third injection, and then the rotation speed increasing rate may be obtained by dividing the second rotation speed increasing rate by the first rotation speed increasing rate.
In implementation, the first preset condition in this embodiment may be one or more criteria for determining whether the rotation speed increasing rate is too high, when the rotation speed increasing rate meets the first preset condition, the rotation speed increasing rate represents that the rotation speed increasing rate of the diesel engine is too high, there may be risks of unstable rotation speed increasing, fire and the like, and subsequent operations need to be performed to reduce the rotation speed increasing rate of the diesel engine.
In practical application, after the fuel supply to at least one cylinder to be supplied is stopped, the steps of obtaining the rotational speed of the diesel engine and calculating the rotational speed increasing rate can be continuously repeated, and if the rotational speed increasing rate still meets the first preset condition, the fuel supply to the rest cylinders to be supplied is continuously stopped until the rotational speed increasing rate does not meet the first preset condition.
In the diesel engine cold start control method provided by the embodiment, the N times of rotation speed signals of the diesel engine can be obtained, the rotation speed increasing rate of the diesel engine can be calculated and determined based on the obtained rotation speed signals, if the rotation speed increasing rate accords with preset conditions, the problem that the current rotation speed of the diesel engine is increased too fast, the fluctuation of the rotation speed is large and the diesel engine is possibly caused is solved, at the moment, the oil supply can be stopped for at least one cylinder which is supplied with oil, the power of the diesel engine can be reduced after the oil supply is stopped, the purpose of reducing the rotation speed increasing rate is achieved, the rotation speed can be increased steadily during the cold start of the diesel engine, and the stability and the safety of the cold start process are improved.
In an exemplary embodiment, the obtaining the diesel engine rotational speed of the diesel engine at the N fuel injection moments closest to the current moment includes:
and receiving a trigger signal after the diesel engine finishes oil injection to the cylinder, and obtaining the rotational speed of the diesel engine at the latest three oil injection moments after the oil injection completion moment.
In an exemplary embodiment, the determining whether the rotation speed increasing rate meets a first preset condition includes:
comparing the rate of increase of rotational speed to a first rate of increase threshold;
And if the rotation speed increasing rate is larger than the first rotation speed increasing rate threshold value and at least one cylinder which is supplied with oil exists in the diesel engine, determining that the rotation speed increasing rate meets the first preset condition.
In this embodiment, a first rotational speed increasing rate threshold is set for the rotational speed increasing rate, the threshold being an upper limit value of the rotational speed increasing rate in a steady state, when the rotational speed increasing rate of the diesel engine is greater than or equal to the first rotational speed increasing rate threshold, it may be determined that the rotational speed of the diesel engine is increasing too fast, and at this time, if at least one cylinder to be supplied with oil is present in the diesel engine, it may be determined that the rotational speed increasing rate meets a first preset condition.
In practical application, the value of the first rotation speed increasing rate threshold value can be 1, that is, the rotation speed increasing value of the last time cannot exceed the rotation speed increasing value obtained by the previous calculation, so that the stable increase of the rotation speed of the diesel engine can be ensured.
In an exemplary embodiment, the stopping the supply of the fuel to the at least one supplied cylinder in the diesel engine further includes:
And judging whether the rotating speed of the diesel engine is at a stable level, and if the rotating speed of the diesel engine is not at the stable level, returning to and executing the step of obtaining the rotating speed of the diesel engine at the moment of N times of oil injection closest to the current moment.
In practical application, if the rotation speed increasing rate of the diesel engine is always higher, but the diesel engine has no cylinder supplied with oil, no additional processing can be performed, a trigger signal can be generated, and early warning is performed on the basis of the trigger signal.
In practical application, a start success signal can be generated after the diesel engine is successfully started, and the start control of the diesel engine is stopped after the start success signal is received.
In an exemplary embodiment, further comprising:
judging whether the rotation speed increasing rate meets a second preset condition or not;
And if the second preset condition is met, re-supplying oil to at least one cylinder of the diesel engine, wherein the cylinder is stopped from being supplied with oil.
In practical applications, when the diesel engine starts for a period of time, one or more cylinders may be in the stage of stopping oil supply, at this time, the rotational speed increasing rate of the diesel engine may be lower than the first rotational speed increasing rate threshold value, if the rotational speed increasing rate of the diesel engine continues to be too low, the engine may be started difficultly, at this time, the cylinders which are stopped from oil supply may be re-supplied with oil, in this process, it may be determined whether the rotational speed increasing rate of the diesel engine meets the second preset condition, if the second preset condition is met, it means that the rotational speed increasing rate of the diesel engine is too low, at least one cylinder which is stopped from oil supply in the diesel engine may be re-supplied with oil at this time, that is, one cylinder may be re-supplied with oil, or a plurality of cylinders may be re-supplied with oil, until the rotational speed increasing rate of the diesel engine does not meet the second preset condition.
In an exemplary embodiment, the determining whether the rotation speed increasing rate meets a second preset condition includes:
comparing the rate of increase of rotational speed to a second rate of increase threshold;
and if the rotation speed increasing rate is smaller than the second rotation speed increasing rate threshold value and at least one cylinder which is stopped from being supplied with oil exists in the diesel engine, determining that the rotation speed increasing rate meets the second preset condition.
In this embodiment, a second speed increasing rate threshold is set for the speed increasing rate, where the second speed increasing rate threshold is equal to a lower limit value of the speed increasing rate of the diesel engine in a steady state, when the speed increasing rate of the diesel engine is less than or equal to the second speed increasing rate threshold, it is indicated that the speed increasing rate of the diesel engine is too low, at this time, if at least one cylinder in the diesel engine that has been stopped from being supplied with fuel is present, it may be determined that the speed increasing rate meets a second preset condition, and further, the supply of fuel to the cylinder that has stopped from being supplied with fuel may be gradually resumed, so as to increase the speed increasing rate of the diesel engine.
In an exemplary embodiment, further comprising:
Judging whether the rotation speed increasing rate meets a third preset condition or not;
If the third preset condition is met, continuously calculating the rotation speed increasing rate of the diesel engine based on the obtained rotation speed of the diesel engine, and judging whether the rotation speed increasing rate meets the third preset condition or not until the diesel engine is started stably.
In practical application, the third preset condition is to judge whether the rotation speed increasing rate of the diesel engine is stable, if the rotation speed increasing rate meets the third preset condition, the current rotation speed of the diesel engine is increased at a relatively stable increasing rate, no additional control is needed for the rotation speed increasing rate, and the rotation speed of the diesel engine is continuously obtained in a circulating way and continuously judged, so that the rotation speed increasing rate of the diesel engine continuously meets the third preset condition, and the diesel engine can be stably started.
In an exemplary embodiment, the determining whether the rotation speed increasing rate meets a third preset condition includes:
Comparing the rate of increase of the rotational speed with the first rate of increase threshold and the second rate of increase threshold;
And if the rotation speed increasing rate is smaller than or equal to the first rotation speed increasing rate threshold and is larger than or equal to the second rotation speed increasing rate threshold, determining that the rotation speed increasing rate meets the third preset condition.
In practical applications, when the rotational speed increasing rate of the diesel engine is between the first rotational speed increasing rate threshold value and the second rotational speed increasing rate threshold value, it may be determined that the rotational speed increasing rate meets a third preset condition, that is, the rotational speed of the diesel engine is increasing steadily.
In an exemplary embodiment, the first rotational speed increase rate threshold has a value of 1.
In an exemplary embodiment, the first rotational speed increase rate threshold value and the second rotational speed increase rate threshold value may be the same value, in which case the third preset condition, i.e., the rotational speed increase rate, is equal to the same value.
Fig. 4 is a second flowchart of a cold start control method of a diesel engine according to an embodiment of the present invention.
The following describes a diesel engine cold start control method provided by the scheme of the application with a specific embodiment in combination with fig. 4, and the method comprises the following steps:
When the diesel engine starts to work under the cold start condition, the rotating speed of the diesel engine is continuously collected;
Transmitting the rotational speed of the diesel engine after continuous three times of oil injection of the diesel engine to a processing module of the diesel engine, wherein the oil injection of the three times is the rotational speed after the nth, the (n+1) th and the (n+2) th oil injection, and acquiring RPM n、RPMn+1、RPMn+2 to obtain three rotational speed values altogether;
based on the three rotation speed values, the rotation speed increasing rate is calculated,
Rn+1＝(RPMn+3-RPMn+2)/(RPMn+2-RPMn+1)
Comparing the calculated rotation speed increasing rate with a preset rotation speed increasing rate threshold Rs, wherein the result is that Rn is more than or equal to Rs or Rn is less than Rs;
if Rn is larger than or equal to Rs, namely the rotation speed increasing rate of the diesel engine is too large, the control module transmits an oil cut-off signal to the execution module, the operation of stopping oil injection of a normal working cylinder is executed in the next oil injection, and if no working cylinder exists at the moment, no operation is executed; if Rn is smaller than Rs, namely the rotation speed increasing rate of the diesel engine does not exceed the preset value, the control module transmits a continuous oil supply signal to the execution module, and the execution module resumes the oil supply of a cylinder which does not normally work when the next oil injection is performed.
The control method for the diesel engine is continuous from the start of the diesel engine until the rotating speed of the diesel engine is increased to a stable level, and the stable level can be flexibly determined according to actual conditions.
The cold start control system of the diesel engine provided by the invention is described below, and the cold start control system of the diesel engine described below and the cold start control method of the diesel engine described above can be referred to correspondingly.
Fig. 5 is a schematic structural diagram of a diesel engine cold start control system according to an embodiment of the present invention.
As shown in fig. 5, the cold start control system for a diesel engine provided in this embodiment includes:
The rotating speed obtaining module 501 is configured to obtain a rotating speed of a diesel engine at N times of fuel injection closest to a current time;
a rotation speed calculation module 502, configured to calculate a rotation speed increase rate of the diesel engine based on the obtained N rotation speeds of the diesel engine;
A judging module 503, configured to judge whether the rotation speed increasing rate meets a first preset condition;
and the fuel cut-off module 504 is configured to cut off fuel supply to at least one cylinder that is supplied with fuel in the diesel engine if the first preset condition is met.
In an exemplary embodiment, the determining module 503 is specifically configured to:
comparing the rate of increase of rotational speed to a first rate of increase threshold;
And if the rotation speed increasing rate is larger than the first rotation speed increasing rate threshold value and at least one cylinder which is supplied with oil exists in the diesel engine, determining that the rotation speed increasing rate meets the first preset condition.
In an exemplary embodiment, the stopping oil supply module 504 is further configured to determine whether the rotational speed of the diesel engine is at a steady level, and if not, return to and execute the step of obtaining the rotational speed of the diesel engine at the N fuel injection moments closest to the current moment.
In an exemplary embodiment, the system further includes a second judging module, where the second judging module is specifically configured to:
judging whether the rotation speed increasing rate meets a second preset condition or not;
And if the second preset condition is met, re-supplying oil to at least one cylinder of the diesel engine, wherein the cylinder is stopped from being supplied with oil.
In an exemplary embodiment, the second determining module is further configured to:
comparing the rate of increase of rotational speed to a second rate of increase threshold;
and if the rotation speed increasing rate is smaller than the second rotation speed increasing rate threshold value and at least one cylinder which is stopped from being supplied with oil exists in the diesel engine, determining that the rotation speed increasing rate meets the second preset condition.
In an exemplary embodiment, the apparatus further includes a third judging module, where the third judging module is specifically configured to:
Judging whether the rotation speed increasing rate meets a third preset condition or not;
If the third preset condition is met, continuously calculating the rotation speed increasing rate of the diesel engine based on the obtained rotation speed of the diesel engine, and judging whether the rotation speed increasing rate meets the third preset condition or not until the diesel engine is successfully started.
In an exemplary embodiment, the third determining module is further configured to:
Comparing the rate of increase of the rotational speed with the first rate of increase threshold and the second rate of increase threshold;
And if the rotation speed increasing rate is smaller than or equal to the first rotation speed increasing rate threshold and is larger than or equal to the second rotation speed increasing rate threshold, determining that the rotation speed increasing rate meets the third preset condition.
In the exemplary embodiment, rotational speed acquisition module 501 is also configured to:
and receiving a trigger signal after the diesel engine finishes oil injection to the cylinder, and obtaining the rotational speed of the diesel engine at the latest three oil injection moments after the oil injection completion moment.
In an exemplary embodiment, the first rotational speed increase rate threshold has a value of 1.
The specific implementation method of the diesel engine cold start control system provided in this embodiment may be implemented with reference to the foregoing embodiments, and will not be described herein again.
Fig. 6 illustrates a physical schematic diagram of an electronic device, as shown in fig. 6, which may include: processor 610, communication interface (Communications Interface) 620, memory 630, and communication bus 640, wherein processor 610, communication interface 620, memory 630 communicate with each other via communication bus 640. The processor 610 may invoke logic instructions in the memory 630 to perform a diesel cold start control method comprising:
obtaining the rotating speed of the diesel engine at the moment of N times of oil injection nearest to the current moment;
Calculating the rotational speed increasing rate of the diesel engine based on the obtained N rotational speeds of the diesel engine;
judging whether the rotation speed increasing rate meets a first preset condition or not;
And stopping oil supply to at least one cylinder supplied with oil in the diesel engine if the first preset condition is met.
Further, the logic instructions in the memory 630 may be implemented in the form of software functional units and stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method of the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, randomAccess Memory), a magnetic disk, an optical disk, or other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product, the computer program product including a computer program, the computer program being storable on a non-transitory computer readable storage medium, the computer program, when executed by a processor, being capable of executing the diesel engine cold start control method provided by the above methods, the method comprising:
obtaining the rotating speed of the diesel engine at the moment of N times of oil injection nearest to the current moment;
Calculating the rotational speed increasing rate of the diesel engine based on the obtained N rotational speeds of the diesel engine;
judging whether the rotation speed increasing rate meets a first preset condition or not;
And stopping oil supply to at least one cylinder supplied with oil in the diesel engine if the first preset condition is met.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform the diesel engine cold start control method provided by the above methods, the method comprising:
obtaining the rotating speed of the diesel engine at the moment of N times of oil injection nearest to the current moment;
Calculating the rotational speed increasing rate of the diesel engine based on the obtained N rotational speeds of the diesel engine;
judging whether the rotation speed increasing rate meets a first preset condition or not;
And stopping oil supply to at least one cylinder supplied with oil in the diesel engine if the first preset condition is met.
The apparatus embodiments described above are merely illustrative, wherein elements illustrated as separate elements may or may not be physically separate, and 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 invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on such understanding, the foregoing technical solutions may be embodied essentially or in part in the form of a software product, which may be stored in a computer-readable storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform the various embodiments or methods of some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The cold start control method of the diesel engine is characterized by comprising the following steps:
obtaining the rotating speed of the diesel engine at the moment of N times of oil injection nearest to the current moment;
Calculating the rotational speed increasing rate of the diesel engine based on the obtained N rotational speeds of the diesel engine;
judging whether the rotation speed increasing rate meets a first preset condition or not;
And stopping oil supply to at least one cylinder supplied with oil in the diesel engine if the first preset condition is met.
2. The method according to claim 1, wherein the determining whether the rotation speed increase rate meets a first preset condition includes:
comparing the rate of increase of rotational speed to a first rate of increase threshold;
And if the rotation speed increasing rate is larger than the first rotation speed increasing rate threshold value and at least one cylinder which is supplied with oil exists in the diesel engine, determining that the rotation speed increasing rate meets the first preset condition.
3. The diesel engine cold start control method according to claim 1, characterized in that the stopping of the supply of the fuel to at least one cylinder of the diesel engine to which the fuel is supplied, further comprises thereafter:
And judging whether the rotating speed of the diesel engine is at a stable level, and if the rotating speed of the diesel engine is not at the stable level, returning to and executing the step of obtaining the rotating speed of the diesel engine at the moment of N times of oil injection closest to the current moment.
4. The diesel engine cold start control method according to claim 2, characterized by further comprising:
judging whether the rotation speed increasing rate meets a second preset condition or not;
And if the second preset condition is met, re-supplying oil to at least one cylinder of the diesel engine, wherein the cylinder is stopped from being supplied with oil.
5. The method according to claim 4, wherein the determining whether the rotation speed increase rate meets a second preset condition includes:
comparing the rate of increase of rotational speed to a second rate of increase threshold;
and if the rotation speed increasing rate is smaller than the second rotation speed increasing rate threshold value and at least one cylinder which is stopped from being supplied with oil exists in the diesel engine, determining that the rotation speed increasing rate meets the second preset condition.
6. The diesel engine cold start control method according to claim 5, characterized by further comprising:
Judging whether the rotation speed increasing rate meets a third preset condition or not;
If the third preset condition is met, continuously calculating the rotation speed increasing rate of the diesel engine based on the obtained rotation speed of the diesel engine, and judging whether the rotation speed increasing rate meets the third preset condition or not until the diesel engine is started stably.
7. The method according to claim 6, wherein the determining whether the rotation speed increase rate meets a third preset condition includes:
Comparing the rate of increase of the rotational speed with the first rate of increase threshold and the second rate of increase threshold;
And if the rotation speed increasing rate is smaller than or equal to the first rotation speed increasing rate threshold and is larger than or equal to the second rotation speed increasing rate threshold, determining that the rotation speed increasing rate meets the third preset condition.
8. The method for controlling cold start of diesel engine according to claim 1, wherein said obtaining the diesel engine rotational speed of the diesel engine at the N fuel injection timings closest to the current timing comprises:
and receiving a trigger signal after the diesel engine finishes oil injection to the cylinder, and obtaining the rotational speed of the diesel engine at the latest three oil injection moments after the oil injection completion moment.
9. The cold start control system of the diesel engine, characterized by comprising:
The rotating speed acquisition module is used for acquiring the rotating speed of the diesel engine at the moment of N times of oil injection nearest to the current moment;
A rotation speed calculation module for calculating a rotation speed increasing rate of the diesel engine based on the obtained N diesel engine rotation speeds;
The judging module is used for judging whether the rotation speed increasing rate meets a first preset condition or not;
and the oil supply stopping module is used for stopping oil supply to at least one cylinder supplied with oil in the diesel engine if the first preset condition is met.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the diesel engine cold start control method according to any one of claims 1-8 when executing the program.
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