CN113685283A - Fuel vehicle, control method and device for ice breaking of electronic throttle valve of fuel vehicle, and ECU - Google Patents

Fuel vehicle, control method and device for ice breaking of electronic throttle valve of fuel vehicle, and ECU Download PDF

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Publication number
CN113685283A
CN113685283A CN202110785887.XA CN202110785887A CN113685283A CN 113685283 A CN113685283 A CN 113685283A CN 202110785887 A CN202110785887 A CN 202110785887A CN 113685283 A CN113685283 A CN 113685283A
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China
Prior art keywords
ice
throttle valve
preset
electronic throttle
opening degree
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CN202110785887.XA
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Chinese (zh)
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CN113685283B (en
Inventor
何元章
雷雪
戴敏
刘爽
张立
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Dongfeng Motor Corp
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Dongfeng Motor Corp
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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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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
    • F02D41/0002—Controlling intake air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
    • F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
    • F02D9/10—Throttle valves specially adapted therefor; Arrangements of such valves in conduits having pivotally-mounted flaps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/04—Engine intake system parameters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • 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)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

The invention discloses a control method for ice breaking of an electronic throttle valve of a gasoline engine, which comprises the following steps: acquiring a first actual opening degree of the electronic throttle valve when the vehicle is powered on; if the absolute value of the difference value between the first actual opening degree and the self-checking target opening degree is more than a first preset value and a vehicle starting signal is received, acquiring a second actual opening degree of the electronic throttle valve after the vehicle is started, and acquiring the variation differential of the second actual opening degree and the temperature of an intake manifold; and when the absolute value of the difference value between the second actual opening and the current target opening is above the first preset value, the absolute value of the change differential is within a second preset value, and the temperature of the intake manifold is lower than a preset temperature, controlling the electronic throttle valve to open ice according to a first preset ice-breaking strategy. By the aid of the scheme, the ice breaking strategy of the vehicle can still be used after the vehicle is started quickly, and driving safety hazards caused by icing of the throttle valve plate are eliminated.

Description

Fuel vehicle, control method and device for ice breaking of electronic throttle valve of fuel vehicle, and ECU
Technical Field
The application relates to the technical field of vehicle control, in particular to a fuel vehicle and a control method, a device and an ECU (electronic control unit) for ice breaking of an electronic throttle valve of the fuel vehicle.
Background
With the development of automobile manufacturing technology, as a key control gateway of a gasoline engine air intake system, the precise control of an electronic throttle valve becomes more and more important. The electronic throttle valve mainly comprises an electric drive motor, a driving gear, two position sensors, a driving shaft and a valve plate. The ECU firstly calculates or looks up a table to obtain the required air inflow and the corresponding opening degree of the throttle according to the requirement of an accelerator pedal of the whole vehicle; and finally, the requirement of controlling the air input accurately in real time is met through a voltage signal fed back by the position sensor. In the case of power failure, the valve plate is returned to or held at the initial or default position by the combined action of the return spring and the torsion spring.
Due to the limitation of the arrangement environment and the working principle of the electronic throttle valve, after the electronic throttle valve is stopped in an environment with lower temperature, water vapor in a crankshaft ventilation system is condensed at a throttle valve plate to form ice beads or ice blocks, so that when the vehicle is started next time, the ice beads/ice blocks clamp the throttle valve plate to enable the valve plate to be in a state that the valve plate cannot be opened or closed, the position of the valve plate cannot reach the required opening degree, and the fault occurs; therefore, ice breaking control strategies equipped with an electric throttle are commonly used on fuel-powered vehicles at present.
In order to reduce the clamping influence of ice beads or ice cubes on a valve plate of a throttle valve, the current EMS system suppliers mainly adopt the operation check of opening and closing the valve plate of the throttle valve under the condition that a vehicle is powered on (key on), and ice breaking is carried out if ice is found. For example, CN111946457A discloses an ice breaking control method for an electronic throttle of a gasoline engine, which is to determine the severity of icing of the throttle when the vehicle is powered on and the engine is not running, and then enter a corresponding ice breaking mode according to the severity of icing. However, the problems with this solution are: to the motorcycle type that can a key start or quick start, can appear and can't effectively open the condition of ice to the throttle.
Disclosure of Invention
The invention provides a fuel vehicle and a control method, a device and an ECU (electronic control unit) for ice breaking of an electronic throttle valve of the fuel vehicle, and aims to solve or partially solve the technical problems that the existing throttle valve ice breaking strategy is suitable for the existing throttle valve ice breaking strategy, and the ice breaking of a vehicle started by one key or quickly cannot be effectively carried out, so that the potential safety hazard of driving is generated.
In order to solve the above technical problem, according to an alternative embodiment of the present invention, there is provided a method for controlling ice breaking of an electronic throttle valve of a gasoline engine, including:
acquiring a first actual opening degree of the electronic throttle valve when the vehicle is powered on;
if the absolute value of the difference value between the first actual opening degree and the self-checking target opening degree is more than a first preset value and a vehicle starting signal is received, acquiring a second actual opening degree of the electronic throttle valve after the vehicle is started, and acquiring the variation differential of the second actual opening degree and the temperature of an intake manifold;
and when the absolute value of the difference value between the second actual opening and the current target opening is above the first preset value, the absolute value of the change differential is within a second preset value, and the temperature of the intake manifold is lower than a preset temperature, controlling the electronic throttle valve to open ice according to a first preset ice-breaking strategy.
Optionally, before the controlling the electronic throttle to open ice according to the first preset ice-breaking policy, the control method further includes:
determining the icing direction of the electronic throttle valve according to the second actual opening and the current target opening; the icing direction includes a closing direction and an opening direction.
Further, if the icing direction is the closing direction, the controlling the electronic throttle valve to open ice according to a first preset ice-breaking strategy includes:
controlling the throttle motor to circularly break ice according to a duty ratio of 83-87% and a driving voltage from-11V to-9V;
if the icing direction is the opening direction, controlling the electronic throttle valve to open ice according to a first preset ice-breaking strategy, including:
and controlling the throttle motor to circularly break ice according to the duty ratio of 83-87% and the driving voltage of 9-11V.
Further, after the controlling the throttle motor to perform the cyclic ice breaking, the control method further includes:
acquiring the times of ice breaking and the actual opening of the electronic throttle valve after ice breaking;
and when the ice breaking times are larger than first preset times or the absolute value of the difference between the actual opening after ice breaking and the current target opening is within the first preset value, quitting the first preset ice breaking strategy.
According to another optional embodiment of the present invention, if the absolute value of the difference between the first actual opening degree and the self-checking target opening degree is greater than or equal to a first preset value and the vehicle start signal is not received, the control method further includes:
and controlling the electronic throttle valve to open ice according to a second preset ice-breaking strategy.
Further, before the controlling the electronic throttle valve to open ice according to the second preset ice-breaking strategy, the control method further includes:
determining the icing direction of the electronic throttle valve according to the first actual opening and the self-checking target opening; the icing direction includes a closing direction and an opening direction.
Further, if the icing direction is the closing direction, the controlling the electronic throttle valve to open ice according to a second preset ice-breaking strategy includes:
controlling the electronic throttle valve to perform circulating ice breaking according to the preset ice breaking opening degree of 0% and the second preset time of 8-12 times;
if the icing direction is the opening direction, controlling the electronic throttle valve to open ice according to a second preset ice-breaking strategy, including:
and controlling the electronic throttle valve to perform circulating ice breaking according to the preset ice breaking opening degree of 83-87% and the second preset time of 8-12 times.
According to still another alternative embodiment of the present invention, there is provided a control apparatus for ice breaking of an electronic throttle valve of a gasoline engine, comprising:
the obtaining module is used for obtaining a first actual opening degree of the electronic throttle valve when the vehicle is powered on; if the absolute value of the difference value between the first actual opening degree and the self-checking target opening degree is more than a first preset value and a vehicle starting signal is received, acquiring a second actual opening degree of the electronic throttle valve after the vehicle is started, and acquiring the variation differential of the second actual opening degree and the temperature of an intake manifold;
and the ice breaking module is used for controlling the electronic throttle valve to break ice according to a first preset ice breaking strategy when the absolute value of the difference value between the second actual opening and the current target opening is above the first preset value, the absolute value of the change differential is within a second preset value, and the temperature of the intake manifold is lower than a preset temperature.
According to yet another alternative embodiment of the present invention, there is provided an engine control unit ECU comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the control method of any one of the preceding claims when executing the computer program.
According to still another alternative embodiment of the present invention, there is provided a fuel powered vehicle including the engine control unit ECU in the foregoing aspect.
Through one or more technical schemes of the invention, the invention has the following beneficial effects or advantages:
the invention provides a control method for ice breaking of an electronic throttle valve of a gasoline engine, which comprises the steps of detecting whether a throttle valve plate is frozen or not at the moment through an absolute value of a difference value between a first actual opening and a self-checking target opening when a vehicle is powered on, and if freezing is detected and a vehicle starting signal is detected at the same time, starting the vehicle preferentially; after the vehicle is started and enters a running state, starting a first preset ice breaking strategy in the running state; firstly, confirming the starting condition of the ice breaking strategy: the absolute value of the difference value between the started second actual opening degree and the current target opening degree is above a first preset value, the variation differential of the second actual opening degree is within a second preset value, and the temperature of the intake manifold is lower than a preset temperature; the judgment of the variation differential of the actual opening degree of the throttle valve is introduced to ensure that the opening degree of the throttle valve is in a stable state, namely, an ice breaking strategy is executed under the condition that the vehicle is in a stable running working condition, so that the damage of a throttle valve plate and even the burning of a throttle motor are avoided, and the normal running of the vehicle is ensured; and then, the difference value of the actual opening degree and the target opening degree of the throttle valve and the temperature of the intake manifold are combined, and when the throttle valve plate is judged to be frozen, the electronic throttle valve is controlled to ice-break according to an ice-breaking strategy in a running state. Generally speaking, the scheme provides an ice breaking strategy of a vehicle in a running state, and supports a user to preferentially ensure the vehicle to start when the vehicle is started in an emergency or the vehicle is started by one key, and then to start executing the ice breaking strategy when the vehicle enters a steady-state working condition after being started, so that the condition that the existing throttle valve ice breaking strategy is only suitable for the vehicle to be powered on and an engine is not started is avoided, the ice breaking strategy of the vehicle can still be used after the vehicle is started quickly, and the potential safety hazard of driving caused by icing and jamming of a throttle valve block is eliminated.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic view showing the structure of an electronic throttle valve according to an embodiment of the invention;
FIG. 2 is a flow chart illustrating a method for controlling ice breaking of an electronic throttle according to an embodiment of the invention;
FIG. 3 illustrates a schematic view of an ice breaking action of a throttle plate according to an embodiment of the present invention;
FIG. 4 is a schematic control flow diagram illustrating integration of first and second predetermined ice breaking strategies according to another embodiment of the present invention;
FIG. 5 shows a schematic diagram of a control device for ice breaking of an electronic throttle according to yet another embodiment of the invention.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments. Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control. Unless otherwise specifically stated, various apparatuses and the like used in the present invention are either commercially available or can be prepared by existing methods.
Research shows that the current ice breaking scheme mainly aims at the working conditions that the vehicle key is in an electrified state and the engine is not started, so that the ice breaking scheme has certain limitations: for a vehicle with a one-key starting or emergency starting function, a customer can directly start the vehicle in an emergency state to enable the vehicle to rapidly enter a running state, so that a key on power-on state is skipped, on one hand, the existing ice breaking strategy cannot be involved, on the other hand, the risk that the throttle valve plate is stuck by ice beads or ice blocks is increased after the vehicle is started, and potential safety hazards of driving are caused. Taking the related technology mentioned in the background technology as an example, the icing detection is carried out within a certain time after the power is supplied again only after the power is completely supplied for the last time, and the priority of the ice breaking action is higher than that of self-learning and normal control; meanwhile, whether the engine runs or not is detected within the set time after the power-on, the engine does not operate if the engine is not frozen, and the engine can break ice even if the engine is started if the engine is frozen, so that certain influence is brought to the starting. Because the power-on detection and the ice breaking time are short, if the ice breaking is unsuccessful, the engine can not perform other ice breaking actions after being started, and the ice breaking effect is limited. Especially for one-key starting vehicle types, the ice breaking control can not be basically entered.
Based on the reasons of the problems, the overall idea of the control method for ice breaking of the electronic throttle valve provided by the invention is as follows:
acquiring a first actual opening degree of the electronic throttle valve when the vehicle is powered on; if the absolute value of the difference value between the first actual opening degree and the self-checking target opening degree is more than a first preset value and a vehicle starting signal is received, acquiring a second actual opening degree of the electronic throttle valve after the vehicle is started, and acquiring the variation differential of the second actual opening degree and the temperature of an intake manifold; and when the absolute value of the difference value between the second actual opening and the current target opening is above the first preset value, the absolute value of the change differential is within a second preset value, and the temperature of the intake manifold is lower than a preset temperature, controlling the electronic throttle valve to open ice according to a first preset ice-breaking strategy.
The improved principle of the scheme is as follows: when the vehicle is powered on, detecting whether the throttle valve plate is frozen or not at the moment through the absolute value of the difference value between the first actual opening and the self-checking target opening, and if freezing is detected and a vehicle starting signal is detected at the same time, preferentially starting the vehicle; after the vehicle is started and enters a running state, starting a first preset ice breaking strategy in the running state; firstly, confirming the starting condition of the ice breaking strategy: the absolute value of the difference value between the started second actual opening degree and the current target opening degree is above a first preset value, the variation differential of the second actual opening degree is within a second preset value, and the temperature of the intake manifold is lower than a preset temperature; the judgment of the variation differential of the actual opening degree of the throttle valve is introduced to ensure that the opening degree of the throttle valve is in a stable state, namely, an ice breaking strategy is executed under the condition that the vehicle is in a stable running working condition, so that the damage of a throttle valve plate and even the burning of a throttle motor are avoided, and the normal running of the vehicle is ensured; and then, when the difference value of the actual opening degree and the target opening degree of the throttle valve and the temperature of the intake manifold are combined, the throttle valve plate is judged to be frozen, and the electronic throttle valve is controlled to break ice according to an ice breaking strategy in a running state. Generally speaking, the scheme provides an ice breaking strategy of a vehicle in a running state, and supports that a user preferentially ensures the vehicle to start when the vehicle is started quickly or the vehicle is started by one key, and then starts to execute the ice breaking strategy when the vehicle enters a steady-state working condition after being started, so that the condition that the existing throttle valve ice breaking strategy is only suitable for the vehicle power-on and the engine is not started is avoided, the ice breaking strategy of the vehicle can still be used after the vehicle is started quickly, and the potential safety hazard of driving caused by icing of a throttle valve plate is eliminated.
In the following, the above-described embodiments will be further described with reference to the specific embodiments.
According to an alternative embodiment, the control method for ice breaking of the electronic throttle valve is applied to an engine control unit ECU of a vehicle type in which the following components are relevant to the present scheme: the engine comprises an electronic throttle valve, an air inlet manifold, a curved pipe, a cylinder body, a cylinder cover, an accelerator pedal, a rotating speed sensor and an engine control unit. The electronic throttle valve can realize the Control from the minimum opening degree of the valve plate to the maximum opening degree range from 0% to 100% according to a target opening degree requirement given by an Engine controller/Unit (Engine Control Unit or Engine management System), and can feed back the actual opening degree of the throttle valve through a position sensor. The control unit of the engine controls the throttle valve by acquiring signals of an accelerator pedal, a throttle position sensor and a rotating speed sensor through calculation and judgment. Generally, the larger the opening degree of the valve plate of the electronic throttle valve, the larger the intake air amount of the engine and the larger the intake pressure, the smaller the intake resistance at the same engine speed.
Fig. 1 shows an electronic throttle structure, wherein an electronic throttle 1 is arranged on an engine intake manifold 2, fresh air or pressurized gas enters the intake manifold 2 through an electronic throttle valve plate, and is mixed with water vapor 3 from a curved pipe 4 to form mixed gas, and the mixed gas enters a combustion chamber of a cylinder head 5 to participate in combustion. When the engine is stopped, water vapor 3 adheres in the vicinity of the throttle blade, i.e., the position circled in fig. 1. Under low temperature environment, the water vapor is condensed into ice beads and ice blocks. After the vehicle is started next time, the initial position of the throttle valve 1 is detected and judged according to the control strategy of the ECU:
s1: acquiring a first actual opening degree of the electronic throttle valve when the vehicle is powered on;
specifically, when the electronic throttle valve is powered on and subjected to self-test, the ECU provides a self-test target opening, the throttle valve sheet acts in response to the self-test target opening, and the first actual opening of the electronic throttle valve at the moment is obtained through the throttle position sensor.
Then, whether the throttle valve plate is frozen or not is detected:
s2: if the absolute value of the difference value between the first actual opening degree and the self-checking target opening degree is more than a first preset value and a vehicle starting signal is received, acquiring a second actual opening degree of the electronic throttle valve after the vehicle is started, and acquiring the variation differential of the second actual opening degree and the temperature of an intake manifold;
specifically, whether the icing phenomenon exists or not is judged according to the difference value between the first actual opening degree and the self-checking target opening degree of the throttle valve sheet when the key is on. And if the absolute value of the difference value between the first actual opening degree and the self-checking target opening degree is larger than a first preset value, the fact that icing exists around the valve plate at the moment is indicated, and then conditions for entering a throttle valve ice breaking strategy are prepared to be judged.
When the icing problem is detected, if a vehicle starting signal, namely the input of an engine starting signal is detected, the vehicle/engine is started preferentially, namely, the ice breaking detection or ice breaking strategy is not carried out in a key on state. After the vehicle is started and enters a running state, the ice breaking strategy of the running state is entered.
Under the ice breaking strategy in running state, firstly, whether the current ice breaking condition is met is judged, and the valve plate is separated from the icing state after the valve plate is possibly started, so that the ice is not broken. The judgment is made by acquiring a current second actual opening degree of the electronic throttle valve, acquiring a variation differential according to the second actual opening degree, and the intake manifold temperature. The variation differential is a calculated differential of the rate of change of the second actual opening degree. Alternatively, the mathematical expression of the variation differential of the second actual opening degree in the present embodiment is as follows:
Figure BDA0003158750160000091
in the above formula, n represents the number of error summations, t1Indicating the accumulated time of the number of summations, d Δ Pct/dt0Representing the differentiation of the position change per unit time.
S3: and when the absolute value of the difference value between the second actual opening and the current target opening is above the first preset value, the absolute value of the change differential is within a second preset value, and the temperature of the intake manifold is lower than a preset temperature, controlling the electronic throttle valve to open ice according to a first preset ice-breaking strategy.
Optionally, the first preset ice breaking policy includes: and controlling the throttle motor to circularly break ice according to the preset duty ratio and the preset driving voltage.
Specifically, the step provides a first preset ice breaking strategy, namely, the starting condition of the ice breaking strategy in the running state. The absolute value of the change differential is within a second preset value, which indicates that the engine speed is stable and the throttle opening is stable at the moment and meets the starting condition of the ice breaking strategy; the difference absolute value of the second actual opening and the current target opening is more than a first preset value, which shows that the actual opening of the throttle valve at the moment can not reach the target opening given by the engine ECU and has more difference; and the temperature of the intake manifold is lower than the preset temperature, which indicates that the ambient temperature is low when the vehicle is started, and the throttle valve is still in the icing state comprehensively. The specific parameters of the first preset value, the second preset value and the preset temperature can be calibrated according to different requirements. For example, for a certain vehicle type, the first preset value may be 3%, the second preset value may be 5% of variation within 2ms of the control period, and the preset temperature is 125 ℃; when the absolute value of the change differential of the second actual opening within 2ms is less than 5% and the condition that the temperature of the intake manifold is less than 125 ℃ is met at the same time, the opening condition of the running ice breaking strategy is met when the | target opening of the throttle valve-actual opening | ≧ 3%.
And after the starting condition is met, the ice breaking action can be started. One alternative to the ice breaking action is shown in conjunction with figures 1 and 3: the engine control unit 9 gives a minimum target opening 12 of the throttle valve plate and then gives an opening requirement of a maximum target opening 13 of the valve plate, and the electronic throttle motor 11 drives the valve plate to circularly act between the two target opening positions so as to achieve the purposes of breaking ice and cleaning ice blocks.
Further research shows that the icing direction of the throttle valve plate is judged before ice breaking, which is beneficial to improving the ice breaking efficiency, so that the control method further comprises the following steps of: determining the icing direction of the electronic throttle valve according to the second actual opening and the current target opening; the icing direction includes a closing direction and an opening direction.
Specifically, taking the first preset value as 3% as an example, if the second actual opening-the current target opening is greater than 3%, it is indicated that the throttle valve plate cannot be further reduced to reach the target opening at this time, and the throttle valve plate is frozen in the closing direction; and if the second actual opening-the current target opening is less than-3%, the throttle valve plate cannot be further increased to reach the target opening, and the throttle valve plate is frozen in the opening direction.
In combination with the above-mentioned ice breaking direction, the embodiment provides an ice breaking action more suitable for running state, which is as follows:
if the icing direction is the closing direction, controlling the throttle motor to circularly break ice according to a duty ratio of 83-87 percent and a driving voltage of-11V to-9V; preferably, the duty ratio is 85% and the driving voltage is-10V.
If the icing direction is the opening direction, controlling the throttle motor to circularly break ice according to a duty ratio of 83-87% and a driving voltage of 9-11V; preferably, the duty ratio is 85% and the driving voltage is 10V.
In the above scheme, the duration of single ice breaking (including the action time and the rest time of the throttle valve plate) may be 0.04 seconds, and the cycle number, i.e., the first preset number, may be 3 or 4. The duration and the number of cycles are set to avoid affecting the normal driving of the vehicle.
Therefore, after the running ice breaking strategy is executed, the control method further comprises
Acquiring the times of ice breaking and the actual opening of the electronic throttle valve after ice breaking;
and when the ice breaking times are larger than first preset times or the absolute value of the difference between the actual opening after ice breaking and the current target opening is within the first preset value, quitting the first preset ice breaking strategy.
This section specifies the exit conditions for running icebreaking policy: if the throttle valve plate can reach the target position after the ice breaking action is finished, exiting the ice breaking strategy; or the throttle valve plate fails to reach the target position, and the maximum actuating cycle number of the ice breaking strategy does not exceed 3 or 4 times.
In summary, the present embodiment provides an ice breaking strategy in a running state, which can be executed after the vehicle enters the running state. The ice breaking opening criterion of the change differential of the actual position of the throttle valve is added, so that the opening of the throttle valve is ensured to be in a stable state, namely, the ice breaking strategy of the vehicle under a stable working condition is ensured, and the normal operation of the vehicle is prevented from being influenced; furthermore, when the throttle valve is used for ice breaking, the control requirement of the driving voltage of a throttle valve motor within the range of +/-9-11V is provided, the duty ratio of the motor is 83% -87% in cooperation with the driving, and the ice breaking force and the ice breaking effect are ensured through the repeated back closing and opening actions of the throttle valve plate; furthermore, the single ice breaking and ice breaking cycle times are provided to ensure that the running ice breaking strategy does not influence the normal use of the vehicle.
The foregoing embodiment provides an ice breaking policy in a running state, and for a key on state, the present invention also provides a set of ice breaking policies, so on the basis of the foregoing embodiment, in another optional embodiment, an ice breaking policy in a key on state is provided, which is specifically as follows:
if the absolute value of the difference value between the first actual opening degree and the self-checking target opening degree is above a first preset value and the vehicle starting signal is not received, the control method further comprises the following steps: and controlling the electronic throttle valve to open ice according to a second preset ice-breaking strategy.
Optionally, the second preset ice breaking policy includes: and controlling the electronic throttle valve to circularly open ice according to the preset ice opening and the second preset times.
Specifically, when the vehicle is powered on by key on, the problem that the throttle valve plate is blocked by icing is detected, at the moment, a vehicle starting signal is input, and if the starting signal is not input, a second ice breaking strategy in a key on power-on state is entered. Optionally, the starting condition of the ice breaking policy in the key on state may be: the vehicle key state is ACC, the engine is not running, and there is no start request currently.
Similarly, the icing direction of the valve plate is determined before ice breaking, so that the ice breaking efficiency is improved, and optionally, the icing direction of the electronic throttle valve is determined according to the first actual opening and the self-checking target opening; the icing direction includes a closing direction and an opening direction.
For example, taking the first preset value as 3%, the target opening degree of the closing direction self-check may be set to be 3%, and if the actual opening degree of the throttle valve is greater than 6%, the closing direction is considered to be frozen; the opening direction self-checking target opening degree can be set to be 15%, and if the actual opening degree of the throttle valve plate is smaller than 12%, the opening direction is considered to be frozen.
After the icing direction is determined, an ice breaking action is performed next, the principle of the ice breaking strategy being as described above: the engine control unit gives the minimum target opening of the throttle valve plate and then gives the opening requirement of the maximum target opening of the valve plate, so that the valve plate acts continuously between the two target opening positions, and the size of the target opening and the cycle number can be determined through calibration.
An alternative ice breaking solution is as follows:
if the icing direction is the closing direction, controlling the electronic throttle valve to circularly break ice according to the preset ice breaking opening degree of 0 percent and the second preset times of 8-12 times, preferably 10 times;
and if the icing direction is the opening direction, controlling the electronic throttle valve to circularly open ice according to the preset ice opening degree of 83-87%, preferably 85%, and the second preset time of 8-12 times, preferably 10 times.
Specifically, when ice is broken in the icing direction, the minimum target opening degree is set to be 0% for breaking ice; when the ice is broken in the opening direction, the ice is broken by setting the maximum target opening to 83-87%. Optionally, the interval between each ice breaking action is 10 ms; the maximum target opening degree may be selected to be 83% to 87% when ice is broken in the freezing direction, and the minimum target opening degree may be selected to be 0% when ice is broken in the opening direction.
After ice breaking is finished, checking the ice breaking effect, and similarly, acquiring the ice breaking times and the actual opening degree of the electronic throttle valve after ice breaking; and when the ice breaking times are larger than second preset times, or the absolute value of the difference between the actual opening after ice breaking and the current target opening is within the first preset value, or an engine starting signal is received, and the second preset ice breaking strategy is exited.
In summary, the embodiment provides an ice breaking strategy in a key on state, and therefore, whether | the target self-detection opening degree-the actual opening degree | exceeds a first preset value is set as a criterion for determining whether the throttle valve reaches the target opening degree, mainly considering that in a stable state, the actual opening degree of the throttle valve, namely, the opening degree of the valve plate is continuously adjusted under PID control, and has a slight change continuously instead of a fixed value, so that a first preset value, such as 3%, is adopted as a determination limit value, and the parameter is a calibratable value. If a smaller limit value is adopted, the throttle valve can continuously carry out an ice breaking strategy, and driving and comfort are influenced. The opening of an icebreaking target is set to be 83-87% when the ice is frozen in the opening direction, and the icebreaking target is mainly used for ensuring the strength of an icebreaking strategy and avoiding damage caused by overload of a motor; if the setting is too small, the ice breaking force is possibly too small, and the ice breaking effect cannot be achieved; if too large, the throttle motor may be damaged, affecting the reliability of the throttle motor.
In summary, in combination with the key on ice breaking strategy and running ice breaking strategy, the control scheme for throttle ice breaking provided by the invention is shown in fig. 4:
(1) when a key on is powered on, detecting whether the absolute value of the difference between the actual opening degree of the throttle valve and the self-checking target opening degree is more than or equal to 3%; if not, the ice breaking function is not started;
(2) if yes, judging whether an engine starting signal is input, if not, entering an ice breaking strategy under a key on state:
key on icebreaking strategy:
starting conditions are as follows:
the key state is ACC, the engine does not run, and no starting request is made;
detecting the icing direction:
and detecting the closing direction and then detecting the opening direction, and if the closing direction is frozen, performing ice breaking in the closing direction and then detecting the opening direction.
Closing direction detection: setting the self-checking target opening degree to be 3%, if the actual opening degree is larger than 6%, determining that the closing direction is frozen, and immediately executing ice breaking in the closing direction;
detecting the opening direction: and setting the self-checking target opening degree to be 15%, if the actual opening degree is less than 12%, determining that the opening direction of the throttle valve is frozen, and immediately executing ice breaking in the opening direction.
The ice breaking action:
opening ice in the closing direction: setting a target ice-breaking opening degree of 0%, impacting 10 times at most, each time with an interval of 10ms, detecting an actual position after each execution is finished, and if the actual opening degree can be less than 3%, determining that ice breaking is successful;
opening direction ice breaking, setting target ice breaking opening degree of 85%, impacting 10 times at most, each time with an interval of 10ms, detecting actual opening degree after each execution is finished, and if the actual opening degree can be larger than 12%, determining that the ice breaking is successful.
Fourthly, implementing an ice breaking strategy:
open-loop control is adopted, so that abnormal operation of an engine or a vehicle is avoided;
quitting conditions:
exiting the ice breaking strategy after the actual opening degree reaches the self-checking target opening degree;
or the key on ice breaking strategy is exited after the engine starting signal is received.
(3) If an engine starting signal is input, starting the vehicle preferentially, and not performing an ice breaking strategy in a key on state; after the vehicle is started, the vehicle is in a running state, and then an ice breaking strategy of the running state is entered:
running ice breaking strategy:
starting conditions are as follows:
the engine speed is stable, the throttle opening is stable, namely the change differential of the actual throttle opening within 2ms of a control period is averaged, the absolute value is required to be less than 5%, the absolute value of the difference between the target throttle opening and the actual throttle opening is more than or equal to 3%, and the temperature of an intake manifold is less than 125 ℃;
detecting the icing direction:
and detecting the closing direction and then detecting the opening direction, and if the closing direction is frozen, performing ice breaking in the closing direction and then detecting the opening direction.
Closing direction detection: if the target opening-actual opening of the throttle valve is less than-3%, the closing direction is considered to be frozen, and ice breaking in the closing direction is immediately carried out;
detecting the opening direction: and if the target opening degree-actual opening degree of the throttle valve is greater than 3%, the opening direction of the throttle valve is considered to be frozen, and the ice breaking in the opening direction is immediately executed.
The ice breaking action:
and after the starting condition is met, starting ice breaking action:
if the opening direction is frozen, setting the duty ratio of the motor to be 85% and setting the driving voltage to be 10V; if the ice is frozen in the closing direction, setting the duty ratio of the motor to be 85 percent and the driving voltage to be-10V, and performing a circulating ice breaking action, wherein the duration time of each time is 0.04s (action + rest time);
fourthly, implementing an ice breaking strategy:
open-loop control is adopted, so that abnormal operation of an engine or a vehicle is avoided;
quitting conditions:
exiting the ice breaking strategy after the actual opening degree reaches the target opening degree;
and if the absolute value of the difference between the actual opening degree and the target opening degree is still greater than 3%, and the number of the actuating cycles of the ice breaking strategy reaches 3.
Based on the same inventive concept of the previous embodiment, in yet another alternative embodiment, there is provided a control device for ice breaking of an electronic throttle valve of a gasoline engine, comprising:
the obtaining module 10 is used for obtaining a first actual opening degree of the electronic throttle valve when the vehicle is powered on; if the absolute value of the difference value between the first actual opening degree and the self-checking target opening degree is more than a first preset value and a vehicle starting signal is received, acquiring a second actual opening degree of the electronic throttle valve after the vehicle is started, and acquiring the variation differential of the second actual opening degree and the temperature of an intake manifold;
and the ice breaking module 20 is configured to control the electronic throttle valve to break ice according to a first preset ice breaking strategy when an absolute value of a difference between the second actual opening and the current target opening is greater than or equal to the first preset value, an absolute value of the change differential is within a second preset value, and the temperature of the intake manifold is lower than a preset temperature.
Optionally, the ice breaking module 20 is configured to:
determining the icing direction of the electronic throttle valve according to the second actual opening and the current target opening; the icing direction includes a closing direction and an opening direction.
Further, if the icing direction is the closing direction, the ice breaking module 20 is configured to:
and controlling the throttle motor to circularly break ice according to the duty ratio of 83-87 percent and the driving voltage from-11V to-9V.
If the icing direction is the opening direction, the ice breaking module 20 is configured to:
and controlling the throttle motor to circularly break ice according to the duty ratio of 83-87% and the driving voltage of 9-11V.
Further, the ice breaking module 20 is configured to:
acquiring the times of ice breaking and the actual opening of the electronic throttle valve after ice breaking;
and when the ice breaking times are larger than first preset times or the absolute value of the difference between the actual opening after ice breaking and the current target opening is within the first preset value, quitting the first preset ice breaking strategy.
As for the above-mentioned control device, if the absolute value of the difference between the first actual opening degree and the self-checking target opening degree is greater than or equal to the first preset value and the vehicle start signal is not received, the ice breaking module 20 is configured to:
and controlling the electronic throttle valve to open ice according to a second preset ice-breaking strategy.
Further, the ice breaking module 20 is configured to:
determining the icing direction of the electronic throttle valve according to the first actual opening and the self-checking target opening; the icing direction includes a closing direction and an opening direction.
Further, if the icing direction is the closing direction, the ice breaking module 20 is configured to:
controlling the electronic throttle valve to perform circulating ice breaking according to the preset ice breaking opening degree of 0% and the second preset time of 8-12 times;
if the icing direction is the opening direction, the ice breaking module 20 is configured to:
and controlling the electronic throttle valve to perform circulating ice breaking according to the preset ice breaking opening degree of 83-87% and the second preset time of 8-12 times.
Based on the same inventive concept of the foregoing embodiments, in yet another alternative embodiment, there is provided an engine control unit ECU comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the control method in the foregoing embodiments when executing the computer program.
Based on the same inventive concept of the foregoing embodiment, in yet another alternative embodiment, there is provided a fuel powered vehicle including the engine control unit ECU of the foregoing embodiment.
Through one or more embodiments of the present invention, the present invention has the following advantageous effects or advantages:
the invention provides a control method and a device for ice breaking of an electronic throttle valve of a gasoline engine and an ECU (electronic control unit). when the vehicle is powered on, whether a throttle valve plate is frozen at the moment is detected through the absolute value of the difference between a first actual opening and a self-checking target opening, and if freezing is detected and a vehicle starting signal is detected at the same time, the vehicle is started preferentially; after the vehicle is started and enters a running state, starting a first preset ice breaking strategy in the running state; firstly, confirming the starting condition of the ice breaking strategy: the absolute value of the difference value between the started second actual opening degree and the current target opening degree is above a first preset value, the variation differential of the second actual opening degree is within a second preset value, and the temperature of the intake manifold is lower than a preset temperature; the judgment of the variation differential of the actual opening degree of the throttle valve is introduced to ensure that the opening degree of the throttle valve is in a stable state, namely, an ice breaking strategy is executed under the condition that the vehicle is in a stable running working condition, so that the damage of a throttle valve plate and even the burning of a throttle motor are avoided, and the normal running of the vehicle is ensured; and then, the difference value of the actual opening degree and the target opening degree of the throttle valve and the temperature of the intake manifold are combined, and when the throttle valve plate is judged to be frozen, the electronic throttle valve is controlled to ice-break according to an ice-breaking strategy in a running state. Generally speaking, the scheme provides an ice breaking strategy of a vehicle in a running state, and supports a user to preferentially ensure the vehicle to start when the vehicle is started in an emergency or the vehicle is started by one key, and then to start executing the ice breaking strategy when the vehicle enters a steady-state working condition after being started, so that the condition that the existing throttle valve ice breaking strategy is only suitable for the vehicle to be powered on and an engine is not started is avoided, the ice breaking strategy of the vehicle can still be used after the vehicle is started quickly, and the potential safety hazard of driving caused by icing and jamming of a throttle valve block is eliminated.
While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (10)

1. A control method for ice breaking of an electronic throttle valve of a gasoline engine is characterized by comprising the following steps:
acquiring a first actual opening degree of the electronic throttle valve when the vehicle is powered on;
if the absolute value of the difference value between the first actual opening degree and the self-checking target opening degree is more than a first preset value and a vehicle starting signal is received, acquiring a second actual opening degree of the electronic throttle valve after the vehicle is started, and acquiring the variation differential of the second actual opening degree and the temperature of an intake manifold;
and when the absolute value of the difference value between the second actual opening and the current target opening is above the first preset value, the absolute value of the change differential is within a second preset value, and the temperature of the intake manifold is lower than a preset temperature, controlling the electronic throttle valve to open ice according to a first preset ice-breaking strategy.
2. The control method according to claim 1, wherein before said controlling the electronic throttle valve to open ice according to the first preset ice-opening policy, the control method further comprises:
determining the icing direction of the electronic throttle valve according to the second actual opening and the current target opening; the icing direction includes a closing direction and an opening direction.
3. The control method according to claim 2, wherein if the icing direction is the closing direction, the controlling the electronic throttle valve to open ice according to a first preset ice-breaking strategy includes:
controlling the throttle motor to circularly break ice according to a duty ratio of 83-87% and a driving voltage from-11V to-9V;
if the icing direction is the opening direction, controlling the electronic throttle valve to open ice according to a first preset ice-breaking strategy, including:
and controlling the throttle motor to circularly break ice according to the duty ratio of 83-87% and the driving voltage of 9-11V.
4. The control method according to claim 3, characterized in that after the controlling the throttle motor to perform cyclic ice breaking, the control method further comprises:
acquiring the times of ice breaking and the actual opening of the electronic throttle valve after ice breaking;
and when the ice breaking times are larger than first preset times or the absolute value of the difference between the actual opening after ice breaking and the current target opening is within the first preset value, quitting the first preset ice breaking strategy.
5. The control method according to any one of claims 1 to 4, wherein if the absolute value of the difference between the first actual opening degree and the self-checking target opening degree is above a first preset value and the vehicle start signal is not received, the control method further comprises:
and controlling the electronic throttle valve to open ice according to a second preset ice-breaking strategy.
6. The control method according to claim 5, wherein before said controlling the electronic throttle valve to open ice according to the second preset ice-opening policy, the control method further comprises:
determining the icing direction of the electronic throttle valve according to the first actual opening and the self-checking target opening; the icing direction includes a closing direction and an opening direction.
7. The control method according to claim 6, wherein if the icing direction is the closing direction, the controlling the electronic throttle valve to open ice according to a second preset ice-breaking strategy comprises:
controlling the electronic throttle valve to perform circulating ice breaking according to the preset ice breaking opening degree of 0% and the second preset time of 8-12 times;
if the icing direction is the opening direction, controlling the electronic throttle valve to open ice according to a second preset ice-breaking strategy, including:
and controlling the electronic throttle valve to perform circulating ice breaking according to the preset ice breaking opening degree of 83-87% and the second preset time of 8-12 times.
8. A control device for ice breaking of an electronic throttle valve of a gasoline engine is characterized by comprising:
the obtaining module is used for obtaining a first actual opening degree of the electronic throttle valve when the vehicle is powered on; if the absolute value of the difference value between the first actual opening degree and the self-checking target opening degree is more than a first preset value and a vehicle starting signal is received, acquiring a second actual opening degree of the electronic throttle valve after the vehicle is started, and acquiring the variation differential of the second actual opening degree and the temperature of an intake manifold;
and the ice breaking module is used for controlling the electronic throttle valve to break ice according to a first preset ice breaking strategy when the absolute value of the difference value between the second actual opening and the current target opening is above the first preset value, the absolute value of the change differential is within a second preset value, and the temperature of the intake manifold is lower than a preset temperature.
9. An Engine Control Unit (ECU) 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 steps of the control method according to any one of claims 1 to 4, 6, 7 when executing the computer program.
10. A fuel powered vehicle, characterized in that it comprises an engine control unit ECU as claimed in claim 9.
CN202110785887.XA 2021-07-12 2021-07-12 Fuel vehicle, control method and device for ice breaking of electronic throttle valve of fuel vehicle, and ECU Active CN113685283B (en)

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