CN113266484A - Protection processing method, device, equipment and storage medium for oxygen sensor - Google Patents
Protection processing method, device, equipment and storage medium for oxygen sensor Download PDFInfo
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- CN113266484A CN113266484A CN202110742711.6A CN202110742711A CN113266484A CN 113266484 A CN113266484 A CN 113266484A CN 202110742711 A CN202110742711 A CN 202110742711A CN 113266484 A CN113266484 A CN 113266484A
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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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1493—Details
- F02D41/1494—Control of sensor heater
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/007—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring oxygen or air concentration downstream of the exhaust apparatus
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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
- F02D41/14—Introducing closed-loop corrections
- F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
- F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
- F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
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- 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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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Measuring Oxygen Concentration In Cells (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The application provides a protection processing method, a device, equipment and a storage medium for an oxygen sensor. Wherein, the method comprises the following steps: when liquid water is detected to exist around the oxygen sensor, acquiring the battery voltage of the engine, the ambient temperature of the engine and the exhaust temperature of the engine, determining a basic duty ratio according to the battery voltage and the ambient temperature, and determining a correction duty ratio according to the exhaust temperature; determining a preheating duty ratio according to the basic duty ratio and the correction duty ratio; and preheating the oxygen sensor according to the preheating duty ratio. The damage of liquid water around the oxygen sensor to the oxygen sensor is avoided when the oxygen sensor is controlled to be heated normally, and the subsequent normal work of the oxygen sensor is guaranteed; further ensuring the normal work of the engine and mechanical equipment.
Description
Technical Field
The present application relates to mechanical device technologies, and in particular, to a method, an apparatus, a device, and a storage medium for protecting an oxygen sensor.
Background
An engine is required to be arranged in the mechanical equipment, the engine is connected with an exhaust pipe, and an oxygen sensor is arranged in the exhaust pipe.
In the prior art, when the environmental temperature is low, if the engine is in a low-load state for a long time or the engine is changed from a high-load state to a fuel cut-off working condition state, the temperature of the position of the oxygen sensor in the exhaust pipe is rapidly reduced, and then liquid water is condensed around the oxygen sensor; at this time, if the normal operating state is turned on to perform normal heating processing on the oxygen sensor, the oxygen sensor may be damaged.
Therefore, how to remove the liquid water around the oxygen sensor is an urgent problem to be solved.
Disclosure of Invention
The application provides a protection processing method, a device, equipment and a storage medium of an oxygen sensor, which are used for solving the problem of how to remove liquid water around the oxygen sensor.
In a first aspect, the present application provides a method for protecting an oxygen sensor, the method comprising:
when the engine is in a low-load state within a preset time period or the engine is changed from a high-load state to an oil-cut working condition state, clearing the normal heating duty ratio represented by the heating information when detecting that liquid water exists around the oxygen sensor;
when the engine recovers oil supply, acquiring the battery voltage of the engine, the ambient temperature of the engine and the exhaust temperature of the engine, determining a basic duty ratio according to the battery voltage and the ambient temperature, and determining a correction duty ratio according to the exhaust temperature;
determining a preheating duty ratio according to the basic duty ratio and the correction duty ratio;
and preheating the oxygen sensor according to the preheating duty ratio.
In an alternative embodiment, determining a base duty cycle based on the battery voltage and the ambient temperature includes:
and determining the basic duty ratio corresponding to the battery voltage of the engine and the ambient temperature of the engine according to a first mapping relation, wherein the first mapping relation represents the corresponding relation among the battery voltage, the ambient temperature and the basic duty ratio.
In an alternative embodiment, determining a modified duty cycle based on the exhaust temperature comprises:
determining a correction duty cycle corresponding to an exhaust temperature of the engine based on a second mapping that characterizes a correspondence between exhaust temperature and correction duty cycle.
In an optional embodiment, after performing the preheating process on the oxygen sensor according to the preheating duty ratio, the method further includes:
obtaining protection control enabling time, and determining a correction factor according to the protection control enabling time;
correcting the exhaust gas energy integral value according to the correction factor to obtain a corrected exhaust gas energy integral value;
and if the corrected exhaust gas energy integral value is determined to be larger than a first preset threshold value, stopping the preheating treatment of the oxygen sensor.
In an alternative embodiment, determining a correction factor according to the protection control enabling time includes:
and determining a correction factor corresponding to the protection control enabling time according to a third mapping relation, wherein the third mapping relation represents the corresponding relation between the protection control enabling time and the correction factor.
In an optional embodiment, the method further comprises:
acquiring detection parameters and protection control enabling time, wherein the detection parameters comprise any of the following parameters: the detection method comprises the following steps of detecting the ambient temperature of the engine, the exhaust temperature of the engine, the working condition state of the engine, the speed of a vehicle where the engine is located and the dew point detection state;
and if the detection parameters are determined to meet the preset conditions and the protection control enabling time is greater than a second preset threshold value, determining that liquid water exists around the oxygen sensor.
In an optional embodiment, the detecting parameters meeting the preset conditions are:
the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, and the dew point detection state represents whether liquid water exists around the oxygen sensor or not and whether initial detection is carried out or not and removal treatment of the liquid water is completed;
or, the detection parameters meeting the preset conditions are as follows: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, the working condition state of the engine represents that the engine is in a fuel cut-off working condition state, and the dew point detection state represents that whether liquid water exists around the oxygen sensor or not is subjected to initial detection and the removal treatment of the liquid water is completed;
or, the detection parameters meeting the preset conditions are as follows: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, the speed of a vehicle where the engine is located is greater than or equal to a fifth preset threshold, and the dew point detection state represents whether liquid water exists around the oxygen sensor or not and whether initial detection is carried out on the liquid water or not and the removal treatment of the liquid water is completed;
or, the detection parameters meeting the preset conditions are as follows: the environment temperature of the engine is smaller than or equal to a third preset threshold value, the exhaust temperature of the engine is smaller than or equal to a fourth preset threshold value, the working condition state of the engine represents that the engine is in a fuel cut-off working condition state, the speed of a vehicle where the engine is located is larger than or equal to a fifth preset threshold value, and the dew point detection state represents that whether liquid water exists around the oxygen sensor or not is subjected to initial detection and removal treatment of the liquid water is completed.
In a second aspect, the present application provides a protective treatment device for an oxygen sensor, the device comprising:
the first acquisition unit is used for resetting the normal heating duty ratio represented by the heating information when detecting that liquid water exists around the oxygen sensor in a low-load state of the engine within a preset time period or in a fuel-cut working condition state of the engine from a high-load state;
a second acquisition unit for acquiring a battery voltage of the engine, an ambient temperature of the engine, and an exhaust temperature of the engine when fuel supply to the engine is resumed;
a first determining unit, configured to determine a basic duty ratio according to the battery voltage and the ambient temperature;
a second determination unit configured to determine a correction duty ratio according to the exhaust temperature;
a third determining unit, configured to determine a preheating duty ratio according to the basic duty ratio and the correction duty ratio;
and the preheating unit is used for preheating the oxygen sensor according to the preheating duty ratio.
In an optional implementation manner, the first determining unit is specifically configured to:
and determining the basic duty ratio corresponding to the battery voltage of the engine and the ambient temperature of the engine according to a first mapping relation, wherein the first mapping relation represents the corresponding relation among the battery voltage, the ambient temperature and the basic duty ratio.
In an optional implementation manner, the second determining unit is specifically configured to:
determining a correction duty cycle corresponding to an exhaust temperature of the engine based on a second mapping that characterizes a correspondence between exhaust temperature and correction duty cycle.
In an optional embodiment, the apparatus further comprises:
a third acquisition unit configured to acquire a protection control enable time after the preheating unit preheats the oxygen sensor according to the preheating duty;
a fourth determining unit, configured to determine a correction factor according to the protection control enabling time;
the correction unit is used for correcting the exhaust gas energy integral value according to the correction factor to obtain a corrected exhaust gas energy integral value;
and the processing unit is used for stopping the preheating processing of the oxygen sensor if the corrected exhaust gas energy integral value is determined to be larger than a first preset threshold value.
In an optional embodiment, the modifying unit is specifically configured to:
and determining a correction factor corresponding to the protection control enabling time according to a third mapping relation, wherein the third mapping relation represents the corresponding relation between the protection control enabling time and the correction factor.
In an alternative embodiment, the apparatus further comprises:
a fourth obtaining unit, configured to obtain a detection parameter and a protection control enabling time, where the detection parameter includes any of the following: the detection method comprises the following steps of detecting the ambient temperature of the engine, the exhaust temperature of the engine, the working condition state of the engine, the speed of a vehicle where the engine is located and the dew point detection state;
and the fifth determining unit is used for determining that liquid water exists around the oxygen sensor if the detection parameters meet the preset conditions and the protection control enabling time is greater than a second preset threshold value.
In an optional embodiment, the detecting parameters meeting the preset conditions are:
the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, and the dew point detection state represents whether liquid water exists around the oxygen sensor or not and whether initial detection is carried out or not and removal treatment of the liquid water is completed;
or, the detection parameters meeting the preset conditions are as follows: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, the working condition state of the engine represents that the engine is in a fuel cut-off working condition state, and the dew point detection state represents that whether liquid water exists around the oxygen sensor or not is subjected to initial detection and the removal treatment of the liquid water is completed;
or, the detection parameters meeting the preset conditions are as follows: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, the speed of a vehicle where the engine is located is greater than or equal to a fifth preset threshold, and the dew point detection state represents whether liquid water exists around the oxygen sensor or not and whether initial detection is carried out on the liquid water or not and the removal treatment of the liquid water is completed;
or, the detection parameters meeting the preset conditions are as follows: the environment temperature of the engine is smaller than or equal to a third preset threshold value, the exhaust temperature of the engine is smaller than or equal to a fourth preset threshold value, the working condition state of the engine represents that the engine is in a fuel cut-off working condition state, the speed of a vehicle where the engine is located is larger than or equal to a fifth preset threshold value, and the dew point detection state represents that whether liquid water exists around the oxygen sensor or not is subjected to initial detection and removal treatment of the liquid water is completed.
In a third aspect, the present application provides a control apparatus comprising: a memory and a processor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to perform the method of the first aspect.
In a fourth aspect, the present application provides a computer-readable storage medium having stored thereon computer-executable instructions for implementing the method according to the first aspect when executed by a processor.
In a fifth aspect, the present application provides a computer program product, comprising: a computer program stored in a readable storage medium from which at least one processor of a control device can read the computer program, execution of the computer program by the at least one processor causing the control device to perform the method of the first aspect.
In a sixth aspect, the present application is a vehicle provided with an engine, an oxygen sensor, and the control apparatus according to the third aspect.
According to the protection processing method, the device, the equipment and the storage medium of the oxygen sensor, when the situation that liquid water exists around the oxygen sensor is detected, the heating duty ratio is cleared firstly, so that the oxygen sensor is protected from being damaged. After the engine recovers oil supply, the oxygen removal sensor needs to be preheated to remove liquid water, the basic duty ratio is determined according to the voltage of the battery and the ambient temperature, and the correction duty ratio is determined according to the exhaust temperature; correcting the basic duty ratio by adopting the correction duty ratio so as to obtain an accurate preheating duty ratio; and carrying out preheating treatment on the oxygen sensor according to the preheating duty ratio so as to evaporate liquid water around the oxygen sensor, and then controlling the oxygen sensor to carry out normal heating so as to enable the oxygen sensor to enter a normal working state. The damage of liquid water around the oxygen sensor to the oxygen sensor is avoided when the oxygen sensor is controlled to be heated normally, the oxygen sensor is guaranteed not to be damaged, and the subsequent normal work of the oxygen sensor is guaranteed; further ensuring the normal work of the engine and mechanical equipment.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic flow chart illustrating a protection processing method for an oxygen sensor according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of a protection processing method for an oxygen sensor according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a protection processing device for an oxygen sensor according to an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of another protection processing device for an oxygen sensor according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a control device according to an embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
An engine is required to be arranged in the mechanical equipment, the engine is connected with an exhaust pipe, and an oxygen sensor is arranged in the exhaust pipe. If the oxygen sensor needs to work normally to collect signals, the oxygen sensor needs to reach a certain temperature, and then needs to be heated. For example, an oxygen sensor model LSU4.9 requires heating to 780 degrees to operate properly. Wherein the engine uses natural gas to provide power for mechanical equipment. Methane is one of the main components of natural gas, and can generate water after combustion, namely water vapor; water vapour is discharged along the exhaust pipe, wherein the water vapour content of the gas discharged from the engine is higher than the water vapour content of the gas discharged from the diesel engine, since the engine uses natural gas as fuel.
However, under the condition of low temperature of the external environment, if the engine runs under low load for a long time or the engine changes from high load to fuel cut-off working condition, the temperature of the position of the oxygen sensor in the exhaust pipe will drop rapidly, and then the water vapor will be condensed into water drops which will be attached to the periphery of the oxygen sensor; at this time, in order to meet the engine control requirement, the oxygen sensor is required to be controlled, so that the oxygen sensor needs to be heated, but if the oxygen sensor is normally heated, water drops around the oxygen sensor damage the oxygen sensor, and the oxygen sensor cannot normally work. Further, the engine and the mechanical equipment cannot work normally.
The application provides a protection processing method, a device, equipment and a storage medium for an oxygen sensor, and aims to solve the technical problems in the prior art.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart of a protection processing method for an oxygen sensor according to an embodiment of the present application, as shown in fig. 1, the method includes:
101. and when the engine is in a low-load state within a preset time period or the engine is changed from a high-load state to an oil-cut working condition state, clearing the normal heating duty ratio represented by the heating information when detecting that liquid water exists around the oxygen sensor.
For example, the execution main body of the embodiment may be an Electronic Control Unit (ECU) in a vehicle, or a Control Unit in a vehicle, or a controller in a vehicle, or other devices or apparatuses that can execute the embodiment, which is not limited in this respect. In the present embodiment, the execution subject is an electronic control unit in a vehicle.
An engine is exemplarily provided in a machine (e.g., a vehicle) to generate power, and thus, control the machine. The engine is connected with an exhaust pipe, and an oxygen sensor is arranged in the exhaust pipe. When the engine is in a low-load state within a preset time period or the engine is changed from a high-load state to a fuel cut-off working condition state, the heating duty ratio needs to be cleared firstly to protect the oxygen sensor from being damaged when liquid water around the oxygen sensor is detected.
102. When the engine resumes fueling, a battery voltage of the engine, an ambient temperature of the engine, and an exhaust temperature of the engine are obtained.
For example, when the engine is returned to fuel supply, the liquid water around the oxygen sensor needs to be removed; to remove liquid water around the oxygen sensor, the oxygen sensor needs to be heated, and an accurate preheat duty cycle needs to be determined before heating. In order to obtain an accurate preheating duty ratio, the electronic control unit needs to acquire the battery voltage of the engine, the ambient temperature of the engine, and the exhaust temperature of the engine first.
In one example, a first sensor is arranged on the engine and used for collecting the ambient temperature of the engine; further, the electronic control unit may acquire the ambient temperature of the engine collected by the first sensor.
A second sensor is arranged on an exhaust pipe of the engine and used for collecting the exhaust temperature of the engine; further, the electronic control unit may acquire the exhaust temperature of the engine collected by the second sensor.
The engine is provided with a third sensor, and the third sensor is used for collecting the battery voltage of the engine; further, the electronic control unit may acquire the battery voltage of the engine collected by the third sensor.
103. And determining a basic duty ratio according to the battery voltage and the ambient temperature, and determining a correction duty ratio according to the exhaust temperature.
Illustratively, to obtain an accurate preheat duty cycle, a base duty cycle may also be required. The corresponding relation among the battery voltage, the ambient temperature and the basic duty ratio of the engine is pre-established, and then the electronic control unit can determine the corresponding basic duty ratio according to the battery voltage and the ambient temperature.
In one example, a two-dimensional array indicating a correspondence relationship among a battery voltage, an ambient temperature, and a basic duty ratio of the engine is stored in advance; therefore, the electronic control unit can obtain the basic duty ratio of the preheating of the oxygen sensor by inquiring the two-dimensional array.
After the basic duty ratio is obtained, the oxygen sensor is not directly subjected to preheating treatment by adopting the basic duty ratio, but the basic duty ratio is required to be corrected; therefore, in order to correct the basic duty ratio, a correction duty ratio needs to be acquired. The corresponding relation between the exhaust temperature of the engine and the correction duty ratio is established in advance, and then the electronic control unit can determine the corresponding correction duty ratio according to the exhaust temperature of the engine.
In one example, a one-dimensional array indicating a correspondence between the exhaust temperature of the engine and the correction duty ratio is stored in advance; the electronic control unit can obtain the correction duty ratio by inquiring the one-dimensional array.
104. And determining the preheating duty ratio according to the basic duty ratio and the correction duty ratio.
Illustratively, the electronic control unit corrects the basic duty ratio by using the correction duty ratio according to the basic duty ratio and the correction duty ratio, and obtains the final preheating duty ratio through algebraic operation. The algebraic operation may be addition, subtraction, or other algebraic operation methods, but is not limited thereto.
105. And preheating the oxygen sensor according to the preheating duty ratio.
Illustratively, the electronic control unit performs a preheating process on the oxygen sensor, i.e., performs an initial heating of the oxygen sensor, according to a preheating duty ratio. Thereby evaporating the liquid water around the oxygen sensor, but the temperature of the oxygen sensor is not controlled to reach the normal operating temperature of the oxygen sensor. The manner of preheating is not limited herein.
In the embodiment, when the engine is in a low-load state within a preset time period or the engine is changed from a high-load state to a fuel cut-off working condition state, when liquid water around the oxygen sensor is detected, the heating duty ratio is cleared to protect the oxygen sensor from being damaged, when the engine recovers oil supply, the oxygen removal sensor is preheated to remove the liquid water, the basic duty ratio is determined according to the voltage of the battery and the ambient temperature, and the correction duty ratio is determined according to the exhaust temperature; correcting the basic duty ratio by adopting the correction duty ratio so as to obtain an accurate preheating duty ratio; and carrying out preheating treatment on the oxygen sensor according to the preheating duty ratio so as to evaporate liquid water around the oxygen sensor, and then controlling the oxygen sensor to carry out normal heating so as to enable the oxygen sensor to enter a normal working state. The damage of liquid water around the oxygen sensor to the oxygen sensor is avoided when the oxygen sensor is controlled to be heated normally, the oxygen sensor is guaranteed not to be damaged, and the subsequent normal work of the oxygen sensor is guaranteed; further ensuring the normal work of the engine and mechanical equipment.
Fig. 2 is a schematic flow chart of a protection processing method for an oxygen sensor according to an embodiment of the present application, as shown in fig. 1, the method includes:
201. acquiring detection parameters and protection control enabling time of the engine, wherein the detection parameters comprise any one or more of the following parameters: the detection method comprises the following steps of detecting the ambient temperature of the engine, the exhaust temperature of the engine, the working condition state of the engine, the speed of a vehicle where the engine is located and the dew point detection state.
The execution subject of the embodiment may be, for example and without limitation, an electronic control unit in a vehicle, or a controller in a vehicle, or other devices or apparatuses that may execute the embodiment. In the present embodiment, the execution subject is an electronic control unit in a vehicle.
The engine is connected with an exhaust pipe, an oxygen sensor is arranged in the exhaust pipe, and whether liquid water exists around the oxygen sensor needs to be detected before the oxygen sensor is preheated. When detecting whether liquid water exists around the oxygen sensor, it is necessary to acquire detection parameters and protect control enabling time.
The protection control enabling time represents the time when the engine is in the state of the fuel cut-off working condition. Alternatively, the protection control enable time is indicative of a time when the engine is in a state where the ambient temperature and the exhaust temperature are low. Or the protection control enabling time represents the time when the engine is in the fuel cut-off working condition and the engine is in the state that the ambient temperature and the exhaust temperature are lower.
The obtained detection parameters may be: the detection method comprises the following steps of detecting the ambient temperature of the engine, the exhaust temperature of the engine, the working condition state of the engine, the speed of a vehicle where the engine is located and the dew point detection state.
The working condition state of the engine refers to whether the engine is in a fuel cut-off working condition or not. The state of the fuel cut-off condition may also be referred to as an over run state. The state of the fuel cut-off condition is specifically that, under the condition that the engine is in normal operation, if the accelerator of the vehicle is not controlled, the accelerator has no other external torque demand, and the engine speed is greater than a certain value, the working state of the engine at the time is called an over run state. For example, when the vehicle is running downhill or when the accelerator of the vehicle is not controlled (in this case, the vehicle is in a free-wheeling running state), the engine of the vehicle is in an Overrun state, in which case the engine does not inject air or oil, and the injection valve of the engine is in a closed state.
The dew point detection process means that before the oxygen sensor is formally and normally heated (the oxygen sensor is normally heated to ensure the normal operation of the oxygen sensor), whether liquid water exists around the oxygen sensor needs to be judged, and the judgment process is the dew point detection process. The dew point detection state is whether or not the oxygen sensor is subjected to a dew point detection process, that is, whether or not the liquid water of the oxygen sensor is detected. For example, the dew point detection state may be 0 or 1, and when the dew point detection state may be 1, the process of detecting the passing dew point of the oxygen sensor is represented; and when the dew point detection state can be 0, representing that the process of detecting the dew point of the oxygen sensor is not carried out.
202. And if the detection parameters are determined to meet the preset conditions and the protection control enabling time of the engine is greater than a second preset threshold value, determining that liquid water exists around the oxygen sensor.
In one example, the detection parameters meeting the preset conditions are as follows: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, and the dew point detection state represents whether liquid water exists around the oxygen sensor or not, and the initial detection is carried out, so that the removal treatment of the liquid water is completed;
or the detection parameters meeting the preset conditions are as follows: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, the working condition state of the engine represents that the engine is in a fuel cut-off working condition state, and the dew point detection state represents that whether liquid water exists around the oxygen sensor or not is subjected to initial detection, and the removal treatment of the liquid water is completed;
or the detection parameters meeting the preset conditions are as follows: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, the speed of a vehicle where the engine is located is greater than or equal to a fifth preset threshold, and the dew point detection state represents whether liquid water exists around the oxygen sensor or not, so that the initial detection is carried out and the removal treatment of the liquid water is completed;
or the detection parameters meeting the preset conditions are as follows: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, the working condition state of the engine represents that the engine is in a fuel cut-off working condition state, the speed of a vehicle where the engine is located is greater than or equal to a fifth preset threshold, and the dew point detection state represents whether liquid water exists around the oxygen sensor or not, and the initial detection is carried out, and the removal treatment of the liquid water is completed.
For example, when determining whether liquid water exists around the oxygen sensor, the determination is made according to a plurality of parameters, that is, whether the liquid water exists around the oxygen sensor is determined by analyzing whether the detection parameters and the protection control enabling time obtained in step 201 are required or not. And if the detection parameters meet the preset conditions and the enabling time of the engine is greater than a second preset threshold value, determining that liquid water exists around the oxygen sensor. If the oxygen sensor is normally heated and controlled, the oxygen sensor is damaged, so that when liquid water is determined to exist around the oxygen sensor, the electronic control unit clears the existing heating duty ratio of the oxygen sensor, the oxygen sensor is not normally heated, and the oxygen sensor is protected.
If the detection parameters do not meet the preset conditions, new detection parameters and new enabling time protection control enabling time can be obtained again, and whether liquid water exists around the oxygen sensor or not can be analyzed and judged again.
203. When the engine resumes fueling, a battery voltage of the engine, an ambient temperature of the engine, and an exhaust temperature of the engine are obtained.
For example, this step may refer to step 102 in fig. 1, and is not described again.
204. And determining the basic duty ratio corresponding to the battery voltage of the engine and the ambient temperature of the engine according to the first mapping relation, wherein the first mapping relation represents the corresponding relation among the battery voltage, the ambient temperature and the basic duty ratio.
Illustratively, to obtain an accurate preheat duty cycle, a base duty cycle may also be required. The first mapping relation represents the corresponding relation among the battery voltage, the ambient temperature and the basic duty ratio of the engine, and the electronic control unit can determine the corresponding basic duty ratio according to the battery voltage and the ambient temperature through the first mapping relation.
In one example, a two-dimensional array indicating a correspondence relationship among a battery voltage, an ambient temperature, and a basic duty ratio of the engine is stored in advance; therefore, the electronic control unit can obtain the basic duty ratio of the preheating of the oxygen sensor by inquiring the two-dimensional array.
205. And determining a correction duty ratio corresponding to the exhaust temperature of the engine according to a second mapping relation, wherein the second mapping relation represents the corresponding relation between the exhaust temperature and the correction duty ratio.
Illustratively, after the base duty cycle is obtained, the oxygen sensor is not directly pre-heated with the base duty cycle, but needs to be corrected; therefore, in order to correct the basic duty ratio, a correction duty ratio needs to be acquired. The second mapping relationship represents a corresponding relationship between the exhaust temperature of the engine and the correction duty ratio, and the electronic control unit can determine the corresponding correction duty ratio according to the exhaust temperature of the engine through the second mapping relationship.
In one example, a one-dimensional array indicating a correspondence between the exhaust temperature of the engine and the correction duty ratio is stored in advance; the electronic control unit can obtain the correction duty ratio by inquiring the one-dimensional array.
206. And determining the preheating duty ratio according to the basic duty ratio and the correction duty ratio.
For example, this step may refer to step 104 in fig. 1, and is not described again.
207. And preheating the oxygen sensor according to the preheating duty ratio.
For example, this step may refer to step 105 of fig. 1, and is not described again.
208. And acquiring the protection control enabling time of the engine, and determining a correction factor according to the protection control enabling time.
In one example, the step 208 of "determining the correction factor according to the protection control enabling time" specifically includes the following steps:
determining a correction factor corresponding to the protection control enable time of the engine based on a third mapping relationship, wherein the third mapping relationship represents a correspondence relationship between the protection control enable time and the correction factor.
Illustratively, after preheating the oxygen sensor, the liquid water around the oxygen sensor begins to evaporate, while the temperature of the oxygen sensor is still not controlled to reach the normal operating temperature of the oxygen sensor. After the engine resumes fuel supply, in order to meet the engine control demand, the oxygen signal must be acquired, and the oxygen sensor needs to be heated to a normal temperature. In order to avoid damage to the oxygen sensor, before the electronic control unit formally heats the oxygen sensor, whether liquid water exists around the oxygen sensor needs to be judged, dew point detection is needed, in order to shorten the time for detecting the dew point of the oxygen sensor and enable the sensor to quickly enter a working state, an exhaust gas energy integral value in dew point detection control needs to be corrected, a correction factor of the exhaust gas energy integral value in dew point detection control needs to be acquired, a corresponding relation between the protection control enabling time of the engine and the correction factor is established in advance, and the electronic control unit can acquire the correction factor according to the protection control enabling time of the engine.
In one example, a third mapping relationship is pre-established, and the third mapping relationship is a one-dimensional array indicating a corresponding relationship between the protection control enabling time of the engine and the correction factor; the electronic control unit may obtain the correction factor by querying the third mapping relationship.
In one example, the smaller the protection control enable time for the engine, the larger the correction factor, i.e., the shorter the time the engine is operating at low load or the engine is operating at fuel cut off, the larger the correction factor.
209. And correcting the exhaust gas energy integral value according to the correction factor to obtain the corrected exhaust gas energy integral value.
Illustratively, the existing exhaust gas integral energy value is corrected according to the correction factor, and the corrected exhaust gas integral energy value is obtained through algebraic operation and then is corrected. The algebraic operation may be addition, subtraction, or other algebraic operation methods, but is not limited thereto.
In one example, the exhaust gas energy integral value is corrected according to a correction factor, and the larger the correction factor is, the larger the exhaust gas energy integral value is when the protection control enable time of the engine is smaller; conversely, when the engine protection control enabled time is longer, the smaller the correction factor is, the smaller the exhaust gas energy integration value is.
210. If it is determined that the corrected exhaust gas energy integrated value is greater than the first preset threshold value, the pre-heating process for the oxygen sensor is stopped.
Illustratively, the corrected integrated value of the energy of exhaust gas is compared with a preset first preset threshold value, and when the corrected integrated value of the energy of exhaust gas is greater than the first preset threshold value, the dew point detection is completed, and when no liquid water exists around the oxygen sensor, the preheating treatment of the oxygen sensor is stopped. Then, the electronic control unit can heat the oxygen sensor normally, and then make the oxygen sensor normally carry out the collection of oxygen signal, and then the engine control demand can be satisfied, and mechanical equipment can normally work.
In this embodiment, whether liquid water exists around the oxygen sensor is judged according to the detection parameters and the protection control enabling time, and when liquid water exists around the oxygen sensor (it is determined that the engine is in the fuel cut-off working condition and/or the time when the exhaust temperature of the engine is lower exceeds a certain limit value at this time), the heating duty ratio can be emptied first so as not to heat the oxygen sensor normally, thereby protecting the oxygen sensor. After the engine resumes oil supply, correcting the basic duty ratio through the correction duty ratio to obtain an accurate preheating duty ratio; adopt accurate duty ratio of preheating to preheat oxygen sensor, and then remove the liquid water around oxygen sensor fast, guaranteed that oxygen sensor can not damage, prolonged oxygen sensor's life-span. When the oxygen sensor is preheated, in order to accelerate the dew point detection time of the oxygen sensor, a correction factor is obtained according to the protection control enabling time of the engine, the existing exhaust gas integral energy value is corrected according to the correction factor, the corrected exhaust gas integral energy value is obtained through algebraic operation, the corrected exhaust gas energy integral value is compared with a preset first preset threshold, when the corrected exhaust gas energy integral value is larger than the first preset threshold, dew point detection is completed, liquid water does not exist around the oxygen sensor, preheating treatment of the oxygen sensor is stopped at the moment, and the electronic control unit can normally output heating to the oxygen sensor. The process accelerates the time of dew point detection, ensures that the oxygen sensor quickly enters a working state, further meets the control requirement of the engine, and ensures that mechanical equipment can normally work.
Fig. 3 is a schematic structural diagram of a protection processing device for an oxygen sensor according to an embodiment of the present application, and as shown in fig. 3, the protection processing device includes:
the first obtaining unit 31 is configured to clear the normal heating duty ratio represented by the heating information when detecting that liquid water exists around the oxygen sensor when the engine is in a low-load state within a preset time period of the engine or the engine is changed from a high-load state to an oil-cut working condition state.
The second obtaining unit 32 is used for obtaining the battery voltage of the engine, the ambient temperature of the engine and the exhaust temperature of the engine when the fuel supply of the engine is recovered.
A first determination unit 33 for determining the base duty cycle based on the battery voltage and the ambient temperature.
And a second determining unit 34 for determining the correction duty ratio according to the exhaust temperature.
A third determining unit 35, configured to determine the preheating duty ratio according to the base duty ratio and the correction duty ratio.
And a preheating unit 36 for preheating the oxygen sensor according to the preheating duty ratio.
For example, the present embodiment may refer to the above method embodiments, and the principle and the technical effect are similar and will not be described again.
Fig. 4 is a schematic structural diagram of another protection processing device for an oxygen sensor according to an embodiment of the present application, and based on the embodiment shown in fig. 3, as shown in fig. 4, the device includes:
the first determining unit 33 is specifically configured to: and determining the basic duty ratio corresponding to the battery voltage of the engine and the ambient temperature of the engine according to the first mapping relation, wherein the first mapping relation represents the corresponding relation among the battery voltage, the ambient temperature and the basic duty ratio.
In an example, the second determining unit 34 is specifically configured to: and determining a correction duty ratio corresponding to the exhaust temperature of the engine according to a second mapping relation, wherein the second mapping relation represents the corresponding relation between the exhaust temperature and the correction duty ratio.
In an example, the apparatus provided in this embodiment further includes:
a third acquisition unit 41 for acquiring the protection control enable time after the preheating unit 35 preheats the oxygen sensor in accordance with the preheating duty ratio.
A fourth determination unit 42, configured to determine the correction factor according to the protection control enable time.
And a correcting unit 43, configured to correct the exhaust gas energy integral value according to the correction factor to obtain a corrected exhaust gas energy integral value.
And a processing unit 44 for stopping the pre-heating process of the oxygen sensor if it is determined that the corrected exhaust gas energy integrated value is greater than a first preset threshold value.
In an example, the modifying unit 43 is specifically configured to: and determining a correction factor corresponding to the protection control enabling time according to a third mapping relation, wherein the third mapping relation represents the corresponding relation between the protection control enabling time and the correction factor.
In an example, the apparatus provided in this embodiment further includes:
a fourth obtaining unit 45, configured to obtain a detection parameter and a protection control enabling time, where the detection parameter includes any one or more of the following: the detection method comprises the following steps of detecting the ambient temperature of the engine, the exhaust temperature of the engine, the working condition state of the engine, the speed of a vehicle where the engine is located and the dew point detection state.
And a fifth determining unit 46, configured to determine that liquid water exists around the oxygen sensor if it is determined that the detection parameter meets the preset condition and the protection control enabling time is greater than the second preset threshold.
In one example, the detection parameters meeting the preset conditions are as follows: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, and the dew point detection state represents whether liquid water exists around the oxygen sensor or not, and the initial detection is carried out, so that the removal treatment of the liquid water is completed;
or the detection parameters meeting the preset conditions are as follows: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, the working condition state of the engine represents that the engine is in a fuel cut-off working condition state, and the dew point detection state represents that whether liquid water exists around the oxygen sensor or not is subjected to initial detection, and the removal treatment of the liquid water is completed;
or the detection parameters meeting the preset conditions are as follows: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, the speed of a vehicle where the engine is located is greater than or equal to a fifth preset threshold, and the dew point detection state represents whether liquid water exists around the oxygen sensor or not, so that the initial detection is carried out and the removal treatment of the liquid water is completed;
or the detection parameters meeting the preset conditions are as follows: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, the working condition state of the engine represents that the engine is in a fuel cut-off working condition state, the speed of a vehicle where the engine is located is greater than or equal to a fifth preset threshold, and the dew point detection state represents whether liquid water exists around the oxygen sensor or not, and the initial detection is carried out, and the removal treatment of the liquid water is completed.
For example, the present embodiment may refer to the above method embodiments, and the principle and the technical effect are similar and will not be described again.
Fig. 5 is a schematic structural diagram of a control device according to an embodiment of the present application, and as shown in fig. 5, the control device includes: memory 51, processor 52.
A memory 51; a memory for storing instructions executable by processor 52.
Wherein the processor 52 is configured to perform the method as provided in the above embodiments. In one example, the control device may be the electronic control unit described above.
Embodiments of the present application also provide a non-transitory computer-readable storage medium, where instructions in the storage medium, when executed by a processor of a control device, enable the control device to perform the method provided by the above embodiments.
An embodiment of the present application further provides a computer program product, where the computer program product includes: a computer program, stored in a readable storage medium, from which at least one processor of the control device can read the computer program, the execution of the computer program by the at least one processor causing the control device to carry out the solution provided by any of the embodiments described above.
The embodiment of the application also provides a vehicle, and the vehicle is provided with an engine, an oxygen sensor and the control equipment provided by any one of the embodiments. The control device may perform the procedures of the above-described method embodiments.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A method of protecting an oxygen sensor, the method comprising:
when the engine is in a low-load state within a preset time period or the engine is changed from a high-load state to an oil-cut working condition state, clearing the normal heating duty ratio represented by the heating information when detecting that liquid water exists around the oxygen sensor;
when the engine recovers oil supply, acquiring the battery voltage of the engine, the ambient temperature of the engine and the exhaust temperature of the engine, determining a basic duty ratio according to the battery voltage and the ambient temperature, and determining a correction duty ratio according to the exhaust temperature;
determining a preheating duty ratio according to the basic duty ratio and the correction duty ratio;
and preheating the oxygen sensor according to the preheating duty ratio.
2. The method of claim 1, wherein determining a base duty cycle based on the battery voltage and the ambient temperature comprises:
and determining the basic duty ratio corresponding to the battery voltage of the engine and the ambient temperature of the engine according to a first mapping relation, wherein the first mapping relation represents the corresponding relation among the battery voltage, the ambient temperature and the basic duty ratio.
3. The method of claim 1, wherein determining a modified duty cycle as a function of the exhaust temperature comprises:
determining a correction duty cycle corresponding to an exhaust temperature of the engine based on a second mapping that characterizes a correspondence between exhaust temperature and correction duty cycle.
4. The method of claim 1, further comprising, after pre-heating the oxygen sensor according to the pre-heating duty cycle:
obtaining protection control enabling time, and determining a correction factor according to the protection control enabling time;
correcting the exhaust gas energy integral value according to the correction factor to obtain a corrected exhaust gas energy integral value;
and if the corrected exhaust gas energy integral value is determined to be larger than a first preset threshold value, stopping the preheating treatment of the oxygen sensor.
5. The method of claim 4, wherein determining a correction factor based on the protection control enable time comprises:
and determining a correction factor corresponding to the protection control enabling time according to a third mapping relation, wherein the third mapping relation represents the corresponding relation between the protection control enabling time and the correction factor.
6. The method according to any one of claims 1-5, further comprising:
acquiring detection parameters and protection control enabling time, wherein the detection parameters comprise any of the following parameters: the detection method comprises the following steps of detecting the ambient temperature of the engine, the exhaust temperature of the engine, the working condition state of the engine, the speed of a vehicle where the engine is located and the dew point detection state;
and if the detection parameters are determined to meet the preset conditions and the protection control enabling time is greater than a second preset threshold value, determining that liquid water exists around the oxygen sensor.
7. The method according to claim 6, wherein the detecting parameters meet the preset conditions: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, and the dew point detection state represents whether liquid water exists around the oxygen sensor or not and whether initial detection is carried out or not and removal treatment of the liquid water is completed;
or, the detection parameters meeting the preset conditions are as follows: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, the working condition state of the engine represents that the engine is in a fuel cut-off working condition state, and the dew point detection state represents that whether liquid water exists around the oxygen sensor or not is subjected to initial detection and the removal treatment of the liquid water is completed;
or, the detection parameters meeting the preset conditions are as follows: the environmental temperature of the engine is less than or equal to a third preset threshold, the exhaust temperature of the engine is less than or equal to a fourth preset threshold, the speed of a vehicle where the engine is located is greater than or equal to a fifth preset threshold, and the dew point detection state represents whether liquid water exists around the oxygen sensor or not and whether initial detection is carried out on the liquid water or not and the removal treatment of the liquid water is completed;
or, the detection parameters meeting the preset conditions are as follows: the environment temperature of the engine is smaller than or equal to a third preset threshold value, the exhaust temperature of the engine is smaller than or equal to a fourth preset threshold value, the working condition state of the engine represents that the engine is in a fuel cut-off working condition state, the speed of a vehicle where the engine is located is larger than or equal to a fifth preset threshold value, and the dew point detection state represents that whether liquid water exists around the oxygen sensor or not is subjected to initial detection and removal treatment of the liquid water is completed.
8. A protective treatment device for an oxygen sensor, the device comprising:
the first acquisition unit is used for resetting the normal heating duty ratio represented by the heating information when detecting that liquid water exists around the oxygen sensor in a low-load state of the engine within a preset time period or in a fuel-cut working condition state of the engine from a high-load state;
a second acquisition unit for acquiring a battery voltage of the engine, an ambient temperature of the engine, and an exhaust temperature of the engine when fuel supply to the engine is resumed;
a first determining unit, configured to determine a basic duty ratio according to the battery voltage and the ambient temperature;
a second determination unit configured to determine a correction duty ratio according to the exhaust temperature;
a third determining unit, configured to determine a preheating duty ratio according to the basic duty ratio and the correction duty ratio;
and the preheating unit is used for preheating the oxygen sensor according to the preheating duty ratio.
9. A control apparatus, characterized by comprising: a memory and a processor;
a memory for storing the processor-executable instructions;
wherein the processor is configured to perform the method of any one of claims 1-7.
10. A vehicle characterized in that an engine, an oxygen sensor, and the control apparatus according to claim 9 are provided on the vehicle.
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| CN110987453A (en) * | 2019-12-19 | 2020-04-10 | 潍柴动力股份有限公司 | Dew point detection control method and device, controller and vehicle |
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| JPS6447965U (en) * | 1987-09-18 | 1989-03-24 | ||
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