CN113153549A - Control method and system for improving performance of engine after starting and storage medium - Google Patents
Control method and system for improving performance of engine after starting and storage medium Download PDFInfo
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- CN113153549A CN113153549A CN202110374652.1A CN202110374652A CN113153549A CN 113153549 A CN113153549 A CN 113153549A CN 202110374652 A CN202110374652 A CN 202110374652A CN 113153549 A CN113153549 A CN 113153549A
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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
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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
- F02D41/08—Introducing corrections for particular operating conditions for idling
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Abstract
The invention discloses a control method, a system and a storage medium for improving the performance of an engine after starting, wherein the control method for improving the performance of the engine after starting comprises the following steps: the method comprises the steps of obtaining the actual rotating speed of an engine after the engine is started, and controlling the engine to gradually reduce the speed to the idle rotating speed when the actual rotating speed of the engine meets a preset condition.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a control method and a control system for improving the performance of an engine after starting and a storage medium.
Background
Successively experience when the engine starts and drag in proper order, the engine is from the moving, the rotational speed is gone up to the peak value, fall back to the process of vehicle idle speed gradually, the first time vehicle that rolls off the production shop starts the difficulty for the first time, be subject to whole car arrangement structure, when the vehicle is rolled off the production line for the first time and is igniteed, oil in the oil tank passes through the oil pump, get into engine combustion chamber in-process via fuel pipe etc. because inside such as fuel pipeline has the air, it is not abundant to burn when making the first time ignition of engine combustion chamber, and the engine speed falls back too fast and can't discharge the air of inside such as fuel pipeline when low excessively, and the ambient temperature is unfavorable for control engine speed when than low and stable and the ride comfort: after the rotating speed of the engine is increased to the peak rotating speed, the engine directly returns to the idling rotating speed of the vehicle, the water temperature of the engine is not favorably increased, the fluctuation of the rotating speed is large, and the intuitive feeling given to a user is that the vehicle has large jitter and poor perception quality in the starting process.
Disclosure of Invention
The invention mainly aims to provide a control method, a control system and a storage medium for improving the performance of an engine after starting, and aims to solve the problems that the idle speed of a vehicle is directly returned to after the rotating speed of the engine is increased to the peak rotating speed, the water temperature of the engine is not favorably improved, and a user feels large jitter and poor perception quality in the starting process of the vehicle due to large rotating speed fluctuation.
In order to achieve the above object, the present invention provides a control method for improving the performance of an engine after starting, comprising the steps of:
acquiring the actual rotating speed of the engine after the engine is started;
and when the actual rotating speed of the engine meets a preset condition, controlling the engine to gradually reduce the speed to the idle rotating speed.
Optionally, the preset condition is that there is a speed reduction command and the actual rotation speed is a peak rotation speed.
Optionally, when the actual rotation speed of the engine meets a preset condition, the step of controlling the engine to gradually reduce the rotation speed to the idle rotation speed comprises:
acquiring the transitional rotating speed of the engine according to the running state parameters of the engine;
and when the actual rotating speed of the engine is reduced to the transitional rotating speed, controlling the engine to maintain the transitional rotating speed to operate for a preset time.
Optionally, the step of controlling the engine to maintain the transitional rotation speed for a preset time when the actual rotation speed of the engine is reduced to the transitional rotation speed further comprises:
after the engine keeps the transitional rotating speed to operate for a preset time period, controlling the engine to continuously reduce the speed;
and controlling the engine to maintain the idle speed operation when the engine speed is reduced to the idle speed.
Optionally, the operating state parameters according to the engine include an engine operating time and a water temperature at which the engine operates.
Optionally, the idle speed is v0Said transitional rotational speed is v1The running time of the engine is T, and the water temperature of the engine during running is M;
the step of obtaining the transitional rotation speed of the engine according to the running state parameters of the engine comprises the following steps:
when v is0At 750rpm, -40 ℃ or more, M or less and-25 ℃ or less, and T or less than 0s or less and 30s, then v11300 rpm; or the like, or, alternatively,
when v is0＝750rpm，-20℃<M is less than or equal to-15 ℃, and T is less than or equal to 0s and less than or equal to 30s, then v11250 rpm; or the like, or, alternatively,
when v is0＝750rpm，-7℃<M is less than or equal to 10 ℃, and T is less than or equal to 0s and less than or equal to 20s, then v11250 rpm; or the like, or, alternatively,
when v is0＝750rpm，20℃<M is less than or equal to 30 ℃, and T is less than or equal to 0s and less than or equal to 20s, then v11240 rpm; or the like, or, alternatively,
when v is0＝750rpm，32℃<M is less than or equal to 70 ℃, and T is less than or equal to 0s and less than or equal to 10s, then v11100 rpm; or the like, or, alternatively,
when v is0(iii) 750rpm, M is 72 ℃, and T is 0s ≦ 10s, then v1＝950rpm。
Optionally, the step of obtaining the transitional rotation speed of the engine according to the operating state parameter of the engine further comprises:
acquiring an actual idle speed of the engine;
acquiring an idle speed difference value between the actual idle speed and the idle speed;
and acquiring the actual transition rotating speed according to the idle speed difference value.
Optionally, the idle speed difference is H, and the actual transitional rotation speed is v3Said actual transitional rotational speed satisfies v3＝v1+H。
Further, to achieve the above object, the present invention also proposes an engine control system comprising:
an engine main body; and the number of the first and second groups,
and a control device electrically connected to the engine main body, wherein the control device includes a memory, a processor, and an engine control program stored in the memory and executable on the processor, and the engine control program is configured to implement the steps of the control method for improving the performance of the engine after starting.
In addition, in order to achieve the above object, the present invention further provides a storage medium storing a control program for improving the performance after the engine start, wherein the control program for improving the performance after the engine start realizes the steps of the control method for improving the performance after the engine start as described above when being executed by a processor.
According to the technical scheme provided by the invention, the actual rotating speed of the engine after the engine is started is obtained, when the actual rotating speed of the engine meets the preset condition, the engine is controlled to be decelerated step by step to the idling rotating speed, the air of a fuel pipeline can be quickly discharged, the water temperature of the engine is improved, the control of the emission and the oil consumption of the whole vehicle is finally facilitated, the core competitiveness of the vehicle is continuously improved, and the phenomenon that a user feels large jitter and poor perception quality when the engine is decelerated suddenly from the actual rotating speed to the idling rotating speed due to large rotating speed fluctuation is avoided.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating the effect of a prior art engine speed control method;
FIG. 2 is a schematic structural diagram of a control device of a hardware operating environment according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a first embodiment of a control method for improving engine performance after start-up provided by the present invention;
FIG. 4 is a schematic diagram illustrating the effects of the engine speed control method of FIG. 3;
FIG. 5 is a schematic flowchart of step S20 in FIG. 3;
FIG. 6 is a schematic flowchart of step S201 in FIG. 5;
FIG. 7 is a flow chart of a test performed on an engine according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Successively experience when the engine starts and drag in proper order, the engine is from the moving, the rotational speed is gone up to the peak value, fall back to the process of vehicle idle speed gradually, the first time vehicle that rolls off the production shop starts the difficulty for the first time, be subject to whole car arrangement structure, when the vehicle is rolled off the production line for the first time and is igniteed, oil in the oil tank passes through the oil pump, get into engine combustion chamber in-process via fuel pipe etc. because inside such as fuel pipeline has the air, it is not abundant to burn when making the first time ignition of engine combustion chamber, and the engine speed falls back too fast and can't discharge the air of inside such as fuel pipeline when low excessively, and be unfavorable for when ambient temperature is than the low control engine speed stability and ride comfort: referring to fig. 1, a section a shows an engine autonomous operation process, a section b shows a process that an engine is reduced from a peak rotating speed to an idle rotating speed, and the engine directly returns to the idle rotating speed of the vehicle after the rotating speed of the engine is increased to the peak rotating speed, so that the water temperature of the engine is not improved, the rotating speed fluctuation is large, and the intuitive feeling given to a user is that the vehicle shakes greatly in the starting process and the perception quality is poor.
In order to solve the above technical problem, the present invention provides an engine control system including an engine main body and a control device electrically connected to the engine main body, wherein the control device includes a memory, a processor, and an engine control program stored in the memory and operable on the processor, and the engine control program is configured to implement the steps of a control method for improving the performance of an engine after start-up.
As shown in fig. 2, the control device 120 may include: a processor 121, e.g. a CPU, a communication bus 122, a user interface 123, a network interface 124, a memory 125. Wherein a communication bus 122 is used to enable the connection communication between these components. The user interface 123 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 123 may also include a standard wired interface, a wireless interface. The network interface 124 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 125 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). The memory 125 may alternatively be a storage device separate from the processor 121 described above.
Those skilled in the art will appreciate that the control device configuration shown in FIG. 2 does not constitute a limitation of the control device, and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
As shown in fig. 2, the memory 125, which is one type of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and an engine control program.
In the control device 120 shown in fig. 2, the processor 121 may call an engine control program stored in the memory 125, and perform the following operations:
acquiring the actual rotating speed of the engine after the engine is started;
and when the actual rotating speed of the engine meets a preset condition, controlling the engine to gradually reduce the speed to the idle rotating speed.
Further, the processor 121 may invoke an engine control program stored in the memory 125, and also perform the following operations:
the preset condition is that a speed reduction instruction exists and the actual rotating speed is the peak rotating speed.
Further, the processor 121 may invoke an engine control program stored in the memory 125, and also perform the following operations:
when the actual rotating speed of the engine meets a preset condition, the step of controlling the engine to gradually reduce the rotating speed to the idle rotating speed comprises the following steps:
acquiring the transitional rotating speed of the engine according to the running state parameters of the engine;
and when the actual rotating speed of the engine is reduced to the transitional rotating speed, controlling the engine to maintain the transitional rotating speed to operate for a preset time.
Further, the processor 121 may invoke an engine control program stored in the memory 125, and also perform the following operations:
when the actual rotating speed of the engine is reduced to the transition rotating speed, the step of controlling the engine to maintain the transition rotating speed for the preset time is followed by the following steps:
after the engine keeps the transitional rotating speed to operate for a preset time period, controlling the engine to continuously reduce the speed;
and controlling the engine to maintain the idle speed operation when the engine speed is reduced to the idle speed.
Further, the processor 121 may invoke an engine control program stored in the memory 125, and also perform the following operations:
the running state parameters of the engine comprise the running time of the engine and the water temperature when the engine runs.
Further, the processor 121 may invoke an engine control program stored in the memory 125, and also perform the following operations:
the idling speed is v0The transitional rotating speed is v1, the running time of the engine is T, and the water temperature of the engine is M;
the step of obtaining the transitional rotation speed of the engine according to the running state parameters of the engine comprises the following steps:
when v is0At 750rpm, -40 ℃ or more, M or less and-25 ℃ or less, and T or less than 0s or less and 30s, then v11300 rpm; or the like, or, alternatively,
when v is0＝750rpm，-20℃<M is less than or equal to-15 ℃, and T is less than or equal to 0s and less than or equal to 30s, then v11250 rpm; or the like, or, alternatively,
when v is0＝750rpm，-7℃<M is less than or equal to 10 ℃, and T is less than or equal to 0s and less than or equal to 20s, then v11250 rpm; or the like, or, alternatively,
when v is0＝750rpm，20℃<M is less than or equal to 30 ℃, and T is less than or equal to 0s and less than or equal to 20s, then v1＝1240rpm; or the like, or, alternatively,
when v is0＝750rpm，32℃<M is less than or equal to 70 ℃, and T is less than or equal to 0s and less than or equal to 10s, then v11100 rpm; or the like, or, alternatively,
when v is0(iii) 750rpm, M is 72 ℃, and T is 0s ≦ 10s, then v1＝950rpm。
Further, the processor 121 may invoke an engine control program stored in the memory 125, and also perform the following operations:
the step of obtaining the transitional rotation speed of the engine according to the operating state parameter of the engine further comprises:
acquiring an actual idle speed of the engine;
acquiring an idle speed difference value between the actual idle speed and the idle speed;
and acquiring the actual transition rotating speed according to the idle speed difference value.
Further, the processor 121 may invoke an engine control program stored in the memory 125, and also perform the following operations:
the idle speed difference value is H, and the actual transition rotating speed is v3Said actual transitional rotational speed satisfies v3＝v1+H。
Based on the above hardware structure, a specific embodiment of the control method for improving the performance of the engine after starting is provided.
Referring to fig. 3 and 4, the first embodiment of the control method for improving the performance of the engine after starting according to the present invention includes the following steps:
step S10: acquiring the actual rotating speed of the engine after the engine is started;
step S20: and when the actual rotating speed of the engine meets a preset condition, controlling the engine to gradually reduce the speed to the idle rotating speed.
According to the technical scheme provided by the invention, the actual rotating speed of the engine after the engine is started is obtained, when the actual rotating speed of the engine meets the preset condition, the engine is controlled to be decelerated step by step to the idling rotating speed, the air of a fuel pipeline can be quickly discharged, the water temperature of the engine is improved, the control of the emission and the oil consumption of the whole vehicle is finally facilitated, the core competitiveness of the vehicle is continuously improved, and the phenomenon that a user feels large jitter in the starting process of the vehicle due to large rotating speed fluctuation when the engine is decelerated suddenly from the actual rotating speed to the idling rotating speed is avoided.
Further, the preset condition is that a speed reduction instruction exists and the actual rotating speed is the peak rotating speed.
In this embodiment, the deceleration instruction means that the operator steps on the brake, works as in the embodiment of this application actual rotational speed is peak value rotational speed, and the operator steps on the brake in order to realize it is right peak value rotational speed slows down to idle rotational speed, because in this application, control the engine slows down to idle rotational speed step by step, avoids the engine by actual rotational speed suddenly slows down to when idle rotational speed, because rotational speed fluctuation is big for the user experiences and has great shake in the vehicle start-up process, and perception quality is poor.
Specifically, referring to fig. 5, the step of controlling the engine to gradually decelerate to the idle rotation speed when the actual rotation speed of the engine meets the preset condition in step S20 includes:
step S201, acquiring a transition rotating speed of the engine according to the running state parameters of the engine;
specifically, in this embodiment, the operating state parameters of the engine include an engine operating time and a water temperature during engine operation, the engine operating time and the water temperature during engine operation are obtained in real time, and then the transition rotation speed of the engine is obtained according to the engine operating time and the water temperature during engine operation.
And S202, controlling the engine to maintain the transitional rotating speed for a preset time when the actual rotating speed of the engine is reduced to the transitional rotating speed.
In this embodiment, when the actual rotational speed of the engine is reduced to the transition rotational speed, the engine is controlled to maintain the transition rotational speed for the preset operation time, so that the engine moves smoothly in the reduction process, the combustion stability of the engine can be improved remarkably, and when the rotational speed of the engine is high, the gas in the fuel pipeline can be discharged as soon as possible.
Further, the step of controlling the engine to maintain the transient rotational speed for a preset time when the actual rotational speed of the engine is reduced to the transient rotational speed in step S202 further includes:
step S203, controlling the engine to continuously reduce the speed after the engine keeps the transitional rotating speed to operate for a preset time period;
and step S204, when the rotating speed of the engine is reduced to the idling rotating speed, controlling the engine to maintain the idling rotating speed to operate.
In this embodiment, in the process of reducing the actual rotation speed to the idle rotation speed, the actual rotation speed is reduced to the transition rotation speed, after the engine maintains the transition rotation speed for a preset time period, the engine is controlled to continue reducing the speed, and when the engine rotation speed is reduced to the idle rotation speed, the engine is controlled to maintain the idle rotation speed, so that the transition rotation speed is set between the actual rotation speed and the idle rotation speed, so that the engine moves smoothly in the reduction process, the combustion stability of the engine can be improved remarkably, and when the engine rotation speed is high, the fuel pipeline gas can be discharged as soon as possible.
Referring to fig. 4, a section c shows a process of reducing an actual rotation speed of the engine to a transition rotation speed, and then reducing the engine speed from the transition rotation speed to an idle rotation speed, in fig. 4, after the engine autonomously operates to a peak rotation speed, in a process of reducing the engine speed from the peak rotation speed to the idle rotation speed, firstly reducing the engine speed from the peak rotation speed to the transition rotation speed, after maintaining the transition rotation speed for a preset time, reducing the engine speed from the transition rotation speed to the idle rotation speed, and maintaining the idle rotation speed for operation.
Further, in the embodiment of the present application, the idle rotation speed is v0Said transitional rotational speed is v1The step S201 of obtaining the transitional rotation speed of the engine according to the operating state parameter of the engine includes:
step S2011a, when v0At 750rpm, -40 ℃ or more, M or less and-25 ℃ or less, and T or less than 0s or less and 30s, then v1＝1300rpm；
In the embodiment, when the idling speed is 750rpm, the water temperature of the running engine is in the range of-40 ℃ to M to 25 ℃ and the running time of the engine is in the range of 0s to T to 30s, the obtained transitional speed is 1300rpm, namely when the engine is decelerated, the engine is decelerated from the actual speed to the transitional speed 1300rpm firstly, the transitional speed 1300rpm is maintained to run for a preset time, and then the engine is decelerated to the idling speed of 750rpm continuously.
Step S2011b, when v0＝750rpm，-20℃<M is less than or equal to-15 ℃, and T is less than or equal to 0s and less than or equal to 30s, then v1 is 1250 rpm;
in the embodiment, when the idle speed is 750rpm, the water temperature of the running engine is in the range of-20 ℃ and less than or equal to M and less than or equal to-15 ℃, the running time of the engine is in the range of 0s and less than or equal to T and less than or equal to 30s, and the obtained transitional speed is 1250rpm, namely when the engine is decelerated, firstly the engine is decelerated from the actual speed to the transitional speed 1250rpm, the transitional speed 1250rpm is maintained for a preset time, and then the engine is decelerated to the idle speed of 750 rpm.
Step S2011c, when v0＝750rpm，-7℃<M is less than or equal to 10 ℃, and T is less than or equal to 0s and less than or equal to 20s, then v1＝1250rpm；
In this embodiment, when the idle speed is 750rpm, the water temperature when the engine runs is in the range of-7 ℃ < M ≦ 10 ℃, and the running time of the engine is in the range of 0s ≦ T ≦ 20s, and the obtained transition speed is 1250rpm, that is, when the engine is decelerated, the engine is decelerated from the actual speed to the transition speed 1250rpm first, the transition speed is maintained at 1250rpm for a preset time, and then the engine is decelerated to the idle speed of 750 rpm.
Step S2011d, when v0＝750，20℃<M is less than or equal to 30 ℃, and T is less than or equal to 0s and less than or equal to 20s, then v1＝1240rpm；
In this embodiment, when the idle speed is 750rpm, the water temperature when the engine runs is in the range of 20 ℃ < M ≦ 30 ℃, and the running time of the engine is in the range of 0s ≦ T ≦ 20s, and the obtained transition speed is 1240rpm, that is, when the engine is decelerated, the engine is decelerated from the actual speed to the transition speed 1240rpm first, the transition speed 1240rpm is maintained for a preset time, and then the engine is decelerated to the idle speed of 750rpm continuously.
Step S2011e, when v0＝750，32℃<M is less than or equal to 70 ℃, and T is less than or equal to 0s and less than or equal to 10s, then v1＝1100rpm；
In this embodiment, when the idle speed is 750rpm, the water temperature range during the operation of the engine is 32 ℃ < M ≦ 70 ℃, the range of the operation time of the engine is 0s ≦ T ≦ 10s, and the obtained transition speed is 1100rpm, that is, when the engine is decelerated, the engine is decelerated from the actual speed to the transition speed 1100rpm first, the transition speed 1100rpm is maintained for the preset time, and then the engine is decelerated to the idle speed of 750 rpm.
Step S2011f, when v0750, M is 72 ℃, and 0s ≦ T ≦ 10s, then v1＝950rpm。
In this embodiment, when the idle speed is 750rpm, the water temperature when the engine operates is in a range of M-72 ℃, and the engine operating time is in a range of 0s ≤ T ≤ 10s, and the obtained transition speed is 950rpm, that is, when the engine is decelerated, the engine is decelerated from the actual speed to the transition speed 950rpm, the transition speed 950rpm is maintained for a preset time, and then the engine is decelerated to the idle speed of 750 rpm.
The control method for improving the performance of the engine after starting is characterized in that the corresponding transition rotating speed is selected according to the running time of the engine and the running water temperature of the engine, the combustion stability of the engine can be obviously improved due to the existence of the transition rotating speed in the process of reducing the actual rotating speed of the engine to the idle rotating speed, the gas in a fuel pipeline can be discharged as soon as possible, the transition rotating speed is selected according to the corresponding temperature, the smoothness and the stability of the rotating speed are facilitated, the increasingly severe requirements of national emission and fuel consumption regulations are met, the brand image of a host factory is improved, the requirements of consumers on the dynamic property, the economical property, the comfort property and the like of the vehicle are met, and the requirement of the starting performance of the engine under the environment with normal temperature, low temperature and high temperature is met synchronously on the premise of taking account of the requirements.
In other embodiments, a plurality of transition rotation speeds may be provided, and the plurality of transition rotation speeds are sequentially provided from large to small, and respectively include a first transition rotation speed, a second transition rotation speed, and a third transition rotation speed, by decelerating the actual rotation speed to the first transition rotation speed and maintaining the first transition rotation speed for a preset time, then the speed is reduced from the first transition rotating speed to the second transition rotating speed, the second transition rotating speed is maintained to operate for a preset time, the speed is reduced from the second transition rotating speed to the third transition rotating speed, and the third transitional rotating speed is maintained to run for a preset time, and the speed is reduced from the third transitional rotating speed to the idle rotating speed, so that the engine moves smoothly in the speed reduction process, the combustion stability of the engine can be obviously improved, and when the rotating speed of the engine is high, the gas in the fuel pipeline can be discharged as soon as possible.
Further, referring to fig. 6, in this embodiment, in order to enable the control method for improving the performance of the engine after starting to be applied to different vehicles in consideration of different actual idle speeds of different vehicles, the step of obtaining the transient rotation speed of the engine according to the operating state parameter of the engine in step S201 further includes:
step S2012, acquiring the actual idle speed of the engine;
step S2013, acquiring an idle speed difference value between the actual idle speed and the idle speed;
and S2014, acquiring an actual transition rotating speed according to the idle speed difference value.
In this embodiment, the actual idle speed of the engine is obtained first, an idle difference is obtained according to the actual idle speed and the idle speed, and an actual transition speed is obtained according to the idle difference, so that the control method for improving the performance of the engine after starting can be applied to different vehicles.
Further, the idle speed difference value is H, and the actual transitional rotation speed is v3Said actual transitional rotational speed satisfies v3＝v1+ H, for example, when the idle speed is 750rpm, the corresponding transition speed is 1300rpm, the obtained actual idle speed is 900rpm, and the corresponding obtained idle difference is 150rpm, thereby obtaining the actual transition speed of 1450 rpm.
Fig. 7 is a flow chart of engine testing, and referring to fig. 7, a notebook computer is provided, INCA7.2.3 (or higher version), ES581/582, a calibration sample vehicle capable of being used normally and corresponding ECU software are installed, a testing device is connected, INCA7.2.3 testing software is opened according to requirements, the ES581/582 is connected with a vehicle through the ECU software, the engine speed platform is set and taught according to different environmental temperatures, and test data are analyzed and processed by MDA.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A control method for improving performance after engine start, comprising the steps of:
acquiring the actual rotating speed of the engine after the engine is started;
and when the actual rotating speed of the engine meets a preset condition, controlling the engine to gradually reduce the speed to the idle rotating speed.
2. The control method for improving performance after engine start according to claim 1, wherein the preset condition is a downshift instruction and the actual rotation speed is a peak rotation speed.
3. The control method for improving the performance after the engine is started according to claim 1, wherein the step of controlling the engine to gradually decelerate to the idle speed when the actual speed of the engine meets a preset condition comprises:
acquiring the transitional rotating speed of the engine according to the running state parameters of the engine;
and when the actual rotating speed of the engine is reduced to the transitional rotating speed, controlling the engine to maintain the transitional rotating speed to operate for a preset time.
4. The control method for improving the performance after engine start according to claim 3, wherein the step of controlling the engine to maintain the transient rotational speed for a preset time when the actual rotational speed of the engine is decelerated to the transient rotational speed further comprises, after the step of controlling the engine to maintain the transient rotational speed for a preset time:
after the engine keeps the transitional rotating speed to operate for a preset time period, controlling the engine to continuously reduce the speed;
and controlling the engine to maintain the idle speed operation when the engine speed is reduced to the idle speed.
5. A control method for improving engine post-start performance as set forth in claim 3, wherein the operating state parameters of the engine include engine run time and water temperature at which the engine is running.
6. The control method for improving engine post-start performance according to claim 5, characterized in that the idle speed is v0The transitional rotating speed is v1, the running time of the engine is T, and the water temperature of the engine is M;
the step of obtaining the transitional rotation speed of the engine according to the running state parameters of the engine comprises the following steps:
when v is0(ii) 750rpm, -40 ℃ or more, M or less and-25 ℃ or less, and 0s or less, T or less and 30s or less, then v1 is 1300 rpm; or the like, or, alternatively,
when v is0＝750rpm，-20℃<M is less than or equal to-15 ℃, and T is less than or equal to 0s and less than or equal to 30s, then v1 is 1250 rpm; or the like, or, alternatively,
when v is0＝750rpm，-7℃<M is less than or equal to 10 ℃, and T is less than or equal to 0s and less than or equal to 20s, then v1 is 1250 rpm; or the like, or, alternatively,
when v is0＝750rpm，20℃<M is less than or equal to 30 ℃, and T is less than or equal to 0s and less than or equal to 20s, then v1 is 1240 rpm; or the like, or, alternatively,
when v is0＝750rpm，32℃<M is less than or equal to 70 ℃, and T is less than or equal to 0s and less than or equal to 10s, then v1 is 1100 rpm; or the like, or, alternatively,
when v is0(iii) 750rpm, M is 72 ℃, and T is 0s ≦ 10s, then v1＝950rpm。
7. The control method for improving the performance after engine start according to claim 6, wherein the step of obtaining the transitional rotation speed of the engine based on the operating state parameter of the engine further comprises:
acquiring an actual idle speed of the engine;
acquiring an idle speed difference value between the actual idle speed and the idle speed;
and acquiring the actual transition rotating speed according to the idle speed difference value.
8. The control method for improving engine post-start performance according to claim 7, wherein the idle speed difference is H, and the actual transient rotational speed is v3Said actual transitional rotational speed satisfies v3＝v1+H。
9. An engine control system, comprising:
an engine main body; and the number of the first and second groups,
a control device electrically connected to the engine main body, the control device including a memory, a processor, and an engine control program stored on the memory and executable on the processor, the engine control program being configured to implement the steps of the control method for improving the post-engine-start performance according to any one of claims 1 to 8.
10. A storage medium having stored thereon a control program for improving the performance after engine start, the control program, when executed by a processor, implementing the steps of the control method for improving the performance after engine start according to any one of claims 1 to 8.
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