Oxygen sensor control method, controller, vehicle and storage medium

Abstract

The present invention relates to an oxygen sensor control method, controller, vehicle, and storage medium, belonging to the field of oxygen sensor control technology. The oxygen sensor is mounted on an engine exhaust pipe, and the method includes: obtaining a first cumulative exhaust heat amount and a first wall temperature at the oxygen sensor mounting location; determining whether the first cumulative exhaust heat amount is greater than an exhaust heat threshold and whether the first wall temperature is greater than a dew point temperature; and activating the oxygen sensor if the first cumulative exhaust heat amount is greater than the exhaust heat threshold and the first wall temperature is greater than the dew point temperature. The present invention determines whether all condensed water at the oxygen sensor mounting location has evaporated by comparing the first cumulative exhaust heat amount with the exhaust heat threshold, and determines whether further condensed water will form at the location by comparing the first wall temperature with the dew point temperature. The oxygen sensor is activated when it is determined that all condensed water at the oxygen sensor mounting location has evaporated and no further condensed water will form at the location. This reduces the risk of damage to the oxygen sensor.

Description

Technical Field

[0001] The present invention relates to the technical field of oxygen sensor control, and in particular to an oxygen sensor control method, a controller, a vehicle, and a storage medium. Background Art

[0002] A wide-band oxygen sensor is a sensor used to measure the oxygen content in engine exhaust. This measurement of exhaust oxygen allows for closed-loop air-fuel ratio control, optimizing combustion efficiency and reducing emissions. Wide-band oxygen sensors are typically installed in the engine exhaust pipe and generally consist of a metal housing, a ceramic body, an oxygen ion conductive layer, and electrodes. The wide-band oxygen sensor performs optimally when its temperature is within the range of 780 ± 10°C, so it is necessary to control the heating of the wide-band oxygen sensor to its operating temperature. However, if condensed water is present at the wide-band oxygen sensor's installation location, rapidly heating it directly to operating temperature could result in the ceramic components of the wide-band oxygen sensor being damaged and cracked by the thermal shock of the condensed water droplets.

[0003] Related technologies determine whether there is condensed water in the exhaust pipe by comparing the exhaust heat in the engine exhaust pipe with the exhaust heat threshold. If there is no condensed water, the wide-range oxygen sensor is turned on to avoid the wide-range oxygen sensor from being subjected to thermal shock from condensed water droplets. However, this method does not fully consider the presence of condensed water at the installation location of the wide-range oxygen sensor, resulting in inaccurate control of the oxygen sensor. Summary of the Invention

[0004] In view of this, it is necessary to provide an oxygen sensor control method, controller, vehicle and storage medium to solve the problem that the relevant technology does not fully consider the occurrence of condensed water at the installation position of the wide-range oxygen sensor, resulting in inaccurate control of the oxygen sensor.

[0005] In order to solve the above problems, in a first aspect, the present invention provides an oxygen sensor control method, wherein the oxygen sensor is installed on the exhaust pipe of the engine, and the method comprises:

[0006] Obtaining a first accumulated exhaust heat and a first wall temperature at the oxygen sensor installation location;

[0007] determining whether the first accumulated exhaust heat is greater than an exhaust heat threshold, and whether the first wall temperature is greater than a dew point temperature;

[0008] If the first accumulated exhaust heat is greater than the exhaust heat threshold and the first wall temperature is greater than the dew point temperature, the oxygen sensor is turned on.

[0009] Optionally, the exhaust pipe further includes a catalyst; and obtaining a first accumulated exhaust heat at the installation position of the oxygen sensor includes:

[0010] The first accumulated exhaust heat at the oxygen sensor installation location is determined by the following formula:

[0011] ;

[0012] in, is the first accumulated exhaust heat at the installation position of the oxygen sensor at the current moment; is the second accumulated exhaust heat at the oxygen sensor installation position at the previous moment; is the change in exhaust heat at the oxygen sensor installation location at the current moment;

[0013] When the engine is in a stopped state, ,in, is the first wall temperature at the oxygen sensor installation location at the current moment; is the second wall temperature at the oxygen sensor installation position at the previous moment; is the heat coefficient corresponding to temperature change;

[0014] When the engine is in operation, ,in, is the first exhaust gas mass flow in the exhaust pipe at the current moment; is the exhaust temperature in the exhaust pipe at the current moment; represents an exhaust temperature threshold value that brings heat to the installation location of the oxygen sensor; is the exhaust specific heat capacity; is an influencing factor on the change in exhaust heat when the catalyst is operating.

[0015] Optionally, the exhaust heat threshold is determined based on the third wall temperature at the oxygen sensor installation position when the engine is started, the engine cooling water temperature, and the number of repeated engine starts.

[0016] Optionally, the method further includes:

[0017] When the oxygen sensor is turned on, the stall information of the engine is determined in real time;

[0018] Determining whether the stall information meets a preset condition;

[0019] If the stall information satisfies a preset condition, the oxygen sensor is turned off, and the process returns to the step of obtaining the accumulated exhaust heat and the wall temperature at the oxygen sensor installation location.

[0020] Optionally, the stall information of the engine includes: a supply relationship characterization value, where the supply relationship characterization value is a ratio of the combustion heat of the engine to a corresponding coefficient of the second exhaust mass flow in the exhaust pipe; and determining whether the stall information satisfies a preset condition includes:

[0021] Determining whether the supply relationship characterization value is less than a preset characterization threshold;

[0022] If the stall information satisfies a preset condition, the oxygen sensor is turned off, and the process returns to the step of obtaining the accumulated exhaust heat and the wall temperature at the oxygen sensor installation location, including:

[0023] If the supply relationship characterization value is less than the preset characterization threshold, the oxygen sensor is turned off, and the process returns to the step of obtaining the cumulative exhaust heat and the wall temperature at the oxygen sensor installation location.

[0024] Optionally, the preset characterization threshold is determined according to the ambient temperature.

[0025] Optionally, the method further includes:

[0026] When the oxygen sensor is turned on, the third wall temperature at the oxygen sensor installation position is obtained in real time;

[0027] determining whether the third wall temperature is less than the dew point temperature;

[0028] If the third wall temperature is lower than the dew point temperature, the oxygen sensor is turned off, and the process returns to the step of obtaining the accumulated exhaust heat and the wall temperature at the oxygen sensor installation location.

[0029] In a second aspect, the present invention further provides a controller for executing the steps in any one of the above-mentioned oxygen sensor control methods.

[0030] In a third aspect, the present invention further provides a vehicle, comprising an oxygen sensor, an engine, an exhaust pipe, and the aforementioned controller; wherein the oxygen sensor is mounted on the exhaust pipe of the engine.

[0031] In a fourth aspect, the present invention further provides a computer-readable storage medium for storing a computer-readable program, wherein the program or instructions, when executed by a processor, can implement the steps in any one of the above-mentioned oxygen sensor control methods.

[0032] The beneficial effects of the present invention are:

[0033] The present invention determines whether all condensed water at the oxygen sensor installation location has evaporated by comparing the first accumulated exhaust heat at the oxygen sensor installation location with the exhaust heat threshold, and determines whether condensed water will still form at the location by comparing the first wall temperature at the oxygen sensor installation location with the dew point temperature. The oxygen sensor is turned on when it is determined that the first accumulated exhaust heat is greater than the exhaust heat threshold and the first wall temperature is greater than the dew point temperature, that is, when it is determined that all condensed water at the oxygen sensor installation location has evaporated and no condensed water will be formed at the location. This can reduce the risk of the oxygen sensor being subjected to thermal shock from condensed water when turned on, and enable the oxygen sensor to operate normally.

[0034] The present invention controls the opening of the oxygen sensor by comprehensively considering the evaporation of condensed water at the installation position of the oxygen sensor and the formation of condensed water, which is more comprehensive and can more effectively reduce the risk of damage to the oxygen sensor after opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of an engine after-treatment emission system provided by the present invention;

[0036] Figure 2 A schematic flow chart of an embodiment of the oxygen sensor control method provided by the present invention;

[0037] Figure 3 A flow chart of another embodiment of the oxygen sensor control method provided by the present invention;

[0038] Figure 4 A schematic diagram of a dew point state control flow of an oxygen sensor provided by the present invention;

[0039] 10-Engine; 20-Electronic Control Unit; 30-Oxygen Sensor; 40-Exhaust Temperature Sensor; 50-Three-Way Catalytic Converter. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] In the description of the embodiments of the present invention, unless otherwise specified, "plurality" means two or more. Terms such as "first" and "second" in the embodiments of the present invention are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, technical features specified as "first" or "second" may explicitly or implicitly include at least one such feature.

[0042] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0043] Reference Figure 1 , which shows a schematic diagram of an engine aftertreatment emission system provided by the present invention. The system includes an engine 10; an electronic control unit (ECU) 20; a wide-band oxygen sensor 30; an exhaust temperature sensor 40; and a three-way catalytic converter (TWC) 50.

[0044] The electronic control unit 20 is used to acquire various types of engine information, calculate and monitor engine behavior. In this embodiment, the electronic control unit 20 is primarily used to implement the following functions: ① Acquire the current engine operating condition information, which includes exhaust mass flow rate, exhaust temperature at the wide-band oxygen sensor installation location, engine speed, and ambient temperature; ② Calculate the wall temperature, dew point temperature, accumulated exhaust heat, exhaust heat threshold, combustion heat, and the ratio of the corresponding coefficient of exhaust mass flow rate at the wide-band oxygen sensor installation location based on the engine operating condition information; ③ Determine the dew point state at the wide-band oxygen sensor installation location based on the calculated wall temperature, dew point temperature, accumulated exhaust heat, exhaust heat threshold, combustion heat, and the ratio of the corresponding coefficient of exhaust mass flow rate; ④ Control the wide-band oxygen sensor on and off based on the dew point state at the wide-band oxygen sensor installation location.

[0045] The wide-range oxygen sensor 30 is used to detect the oxygen content in the engine exhaust pipe to obtain the actual fuel-air ratio of the current working conditions and perform closed-loop correction on the fuel.

[0046] The exhaust temperature sensor 40 is used to detect the exhaust temperature at the installation location of the wide-range oxygen sensor to calculate the relevant signal for dew point diagnosis.

[0047] Reference Figure 2 , shows a flow chart of an embodiment of an oxygen sensor control method provided by the present invention, wherein the oxygen sensor is installed on the exhaust pipe of the engine, and the method includes:

[0048] S101 , obtaining a first accumulated exhaust heat amount and a first wall temperature at an oxygen sensor installation location.

[0049] The oxygen sensor can be a wide-band oxygen sensor. The first accumulated exhaust heat and first wall temperature at the oxygen sensor installation location can be calculated based on the engine's operating condition information. For example, when the engine is running, the first wall temperature at the oxygen sensor installation location can be calculated based on the exhaust temperature at the oxygen sensor installation location, exhaust mass flow rate, vehicle speed, ambient temperature, and other conditions, taking into account heat exchange between the exhaust gas and the exhaust pipe wall, and between the exhaust pipe wall and the external environment. When the engine is stopped, with no exhaust passing through the exhaust pipe, the first wall temperature at the oxygen sensor installation location can be calculated based on the downtime, ambient temperature, and other conditions, taking into account heat exchange between the oxygen sensor wall and the external environment.

[0050] The first wall temperature can also be directly detected by a temperature detection device.

[0051] S102 , determining whether a first accumulated exhaust heat amount is greater than an exhaust heat threshold, and whether a first wall temperature is greater than a dew point temperature.

[0052] The exhaust heat threshold can be determined based on the third wall temperature at the oxygen sensor installation location when the engine is started, the engine cooling water temperature, and the number of repeated engine starts.

[0053] The dew point temperature is the temperature at which the gas reaches saturation with water vapor under a certain pressure. The dew point temperature can be obtained by checking the exhaust gas pressure and temperature at the oxygen sensor installation location using the MAP.

[0054] S103: If the first accumulated exhaust heat is greater than the exhaust heat threshold and the first wall temperature is greater than the dew point temperature, the oxygen sensor is turned on.

[0055] When the first accumulated exhaust heat at the oxygen sensor installation position is greater than the exhaust heat threshold, there is no condensed water at the oxygen sensor installation position; when the first accumulated exhaust heat at the oxygen sensor installation position is less than the exhaust heat threshold, there is condensed water at the oxygen sensor installation position.

[0056] When the first wall temperature at the oxygen sensor installation location is greater than the dew point temperature, no condensed water will form at the oxygen sensor installation location; when the temperature at the sensor installation location is less than the dew point temperature, water vapor in the exhaust gas will form condensed water in the exhaust pipe.

[0057] Therefore, when the first accumulated exhaust heat is greater than the exhaust heat threshold and the first wall temperature is greater than the dew point temperature, the dew point state at this time is determined to be the dew point passing state, and the oxygen sensor is turned on; and when the first accumulated exhaust heat is less than or equal to the exhaust heat threshold, or the first wall temperature is less than or equal to the dew point temperature, the dew point state at this time is determined to be the dew point not passing state, and the oxygen sensor is kept in the closed state.

[0058] The present invention determines whether all condensed water at the oxygen sensor installation location has evaporated by comparing the first accumulated exhaust heat at the oxygen sensor installation location with the exhaust heat threshold, and determines whether condensed water will still form at the location by comparing the first wall temperature at the oxygen sensor installation location with the dew point temperature. When it is determined that the first accumulated exhaust heat is greater than the exhaust heat threshold, and the first wall temperature is greater than the dew point temperature, that is, when it is determined that all condensed water at the oxygen sensor installation location has evaporated and no condensed water will be formed at the location, the oxygen sensor is turned on. This can reduce the risk of the oxygen sensor being subjected to thermal shock from condensed water after being turned on, and enable the oxygen sensor to operate normally.

[0059] The present invention controls the opening of the oxygen sensor by comprehensively considering the evaporation of condensed water at the installation position of the oxygen sensor and the formation of condensed water, which is more comprehensive and can more effectively reduce the risk of damage to the oxygen sensor after opening.

[0060] In one embodiment, the exhaust pipe further includes a catalyst; S101 may specifically include: determining a first accumulated exhaust heat at the oxygen sensor installation location using the following formula:

[0061] ;

[0062] in, The first accumulated exhaust heat at the oxygen sensor installation position at the current moment; The second accumulated exhaust heat at the oxygen sensor installation position at the previous moment; It is the change in exhaust heat at the oxygen sensor installation location at the current moment.

[0063] When the engine is first started in each driving cycle, the accumulated exhaust heat is set to 0; when the engine is started, the high-temperature exhaust flow transfers heat to the oxygen sensor installation location, and the accumulated exhaust heat at the oxygen sensor installation location continues to increase; after the engine is stopped, there is no exhaust to provide heat, and the heat exchange with the external environment causes the accumulated exhaust heat at the oxygen sensor installation location to continue to decrease. Therefore, it is necessary to calculate based on the start / stop state of the engine. .

[0064] When the engine is stopped, ,in, The first wall temperature at the oxygen sensor installation location at the current moment; is the second wall temperature at the oxygen sensor installation location at the previous moment; is the heat coefficient corresponding to the temperature change.

[0065] When the engine is running, ,in, is the first exhaust mass flow in the exhaust pipe at the current moment; is the exhaust temperature in the exhaust pipe at the current moment; Indicates the exhaust temperature threshold that brings heat to the oxygen sensor installation location; is the exhaust specific heat capacity; It is the factor that affects the change in exhaust heat when the catalyst is running.

[0066] In one embodiment, the exhaust heat threshold is approximately proportional to the amount of heat required to transfer exhaust heat to the exhaust pipe wall after the engine is started so that no condensed water forms at the oxygen sensor installation location. The exhaust heat threshold can be calculated based on the wall temperature at the sensor installation location when the engine is started, the engine cooling water temperature, and the number of repeated starts. Specifically, the exhaust heat threshold The calculation formula is:

[0067]

[0068] in, is the original exhaust heat threshold, The factor that affects the exhaust heat threshold due to the number of repeated engine starts within a preset time period.

[0069] The original exhaust heat threshold can be calculated by checking the MAP based on the first wall temperature at the oxygen sensor installation location and the engine cooling water temperature during engine cold start. The size of the original exhaust heat threshold decreases as the first wall temperature at the oxygen sensor installation location and the engine cooling water temperature increase.

[0070] If the dew point is not reached in the previous driving cycle, the condensed water in the exhaust system is not completely evaporated, and more condensed water is expected to exist at the next start, requiring more accumulated exhaust heat. Therefore, the more repeated starts, the Therefore, the original exhaust heat threshold needs to be corrected based on the engine restart counter. ① If the dew point endpoint has not been reached when the engine is powered off, the restart counter is incremented by 1. ② If the dew point endpoint is reached when the engine is powered off, the restart counter is reset to 0. ③ The original exhaust heat threshold is corrected based on the restart counter value. The larger the restart counter value, the more accumulated exhaust heat is required, and the larger the heat correction to the original exhaust heat threshold.

[0071] Reference Figure 3 , shows a flow chart of another embodiment of the oxygen sensor control method provided by the present invention, the method comprising:

[0072] S201 , obtaining a first accumulated exhaust heat amount and a first wall temperature at an oxygen sensor installation location.

[0073] S202 , determining whether a first accumulated exhaust heat amount is greater than an exhaust heat threshold, and whether a first wall temperature is greater than a dew point temperature.

[0074] S203: If the first accumulated exhaust heat is greater than the exhaust heat threshold and the first wall temperature is greater than the dew point temperature, the oxygen sensor is turned on.

[0075] S204: After the oxygen sensor is turned on, engine stall information is determined in real time.

[0076] Stall refers to the situation where the engine suddenly stops running during operation. Stalling usually occurs in the following situations: ① Improper throttle control: The driver suddenly releases the accelerator or steps on the brake while driving, causing the engine to lose sufficient air intake and fuel supply and stop running. ② Engine failure: Mechanical failure inside the engine (such as spark plug failure, fuel pump failure, etc.) may cause the engine to fail to operate normally and eventually stall. ③ Improper clutch operation: In a manual transmission vehicle, if the driver does not operate the clutch correctly when shifting gears, it may cause the engine to stall. ④ Air flow sensor failure: A failure of the air flow sensor may cause the engine control system to be unable to correctly adjust the mixture ratio of fuel and air, resulting in a stall.

[0077] When the engine stalls, the wall temperature at the oxygen sensor's mounting location may fall below the dew point again, causing condensation to form at the sensor's location. Therefore, after the dew point is passed and the oxygen sensor is activated, real-time monitoring of engine stall information is necessary. Stall information can include stall duration and severity. The severity of the stall can be determined by measuring fuel consumption and engine speed.

[0078] S205: Determine whether the stall information meets a preset condition.

[0079] S206: If the stall information meets the preset conditions, the oxygen sensor is turned off, and the process returns to the step of obtaining the accumulated exhaust heat and the wall temperature at the oxygen sensor installation location.

[0080] If the stall time is too long and / or the stall degree is too large, the dew point state may be set to dew point failure, and the oxygen sensor may be turned off. Then, the process returns to S101 to determine whether the oxygen sensor meets the opening condition.

[0081] This embodiment monitors the engine stall information after the oxygen sensor is turned on to determine whether condensed water will re-form at the oxygen sensor installation location after the oxygen sensor is turned on. If it is determined that condensed water will re-form, the oxygen sensor is turned off to prevent the oxygen sensor from being damaged by thermal shock of the condensed water.

[0082] In one embodiment, the stall information of the engine includes: a supply relationship characterization value, which is the ratio of the combustion heat of the engine to the corresponding coefficient of the second exhaust mass flow in the exhaust pipe; then S205 may specifically include: determining whether the supply relationship characterization value is less than a preset characterization threshold; S206 may specifically include: if the supply relationship characterization value is less than the preset characterization threshold, turning off the oxygen sensor, and returning to the step of obtaining the accumulated exhaust heat and wall temperature at the oxygen sensor installation position.

[0083] When fuel consumption is low, the corresponding heat supply is smaller. When engine speed is high, the corresponding mass flow rate is larger. Low exhaust heat input to the oxygen sensor installation location and high exhaust mass flow rate indicate that the engine is stalled. Therefore, a value representing the supply relationship between the engine's combustion heat and the second exhaust mass flow rate in the exhaust pipe can be determined based on engine fuel consumption and engine speed. This supply relationship value is used to represent the relative magnitude of the engine's combustion heat and the second exhaust mass flow rate in the exhaust pipe.

[0084] Specifically, a signal fac1 can be obtained by querying the MAP based on fuel consumption. fac1 increases with increasing fuel consumption. A signal fac2 can be obtained by querying the MAP based on engine speed. fac2 increases with increasing engine speed. The ratio fac of fac1 and fac2 can be used as a value representing the supply relationship between the engine's combustion heat and the second exhaust mass flow rate in the exhaust pipe.

[0085] The preset characterization threshold is related to the ambient temperature. The lower the ambient temperature, the larger the corresponding preset characterization threshold. Therefore, the preset characterization threshold can be determined according to the ambient temperature.

[0086] In one embodiment, the oxygen sensor control method further includes: after turning on the oxygen sensor, obtaining in real time the third wall temperature at the oxygen sensor installation location; determining whether the third wall temperature is less than the dew point temperature; if the third wall temperature is less than the dew point temperature, turning off the oxygen sensor and returning to S101.

[0087] When the engine is in a stall, the wall temperature at the oxygen sensor installation location may be lower than the dew point temperature again. At this time, condensed water will re-form. Therefore, after the oxygen sensor is turned on, it is necessary to detect the third wall temperature at the oxygen sensor installation location in real time. When the third wall temperature is lower than the dew point temperature, the oxygen sensor is turned off.

[0088] Reference Figure 4, showing a schematic diagram of a dew point state control process of an oxygen sensor provided by the present invention. First, a dew point pass judgment of the wide-range oxygen sensor is performed, specifically: judging whether the first cumulative exhaust heat is greater than the exhaust heat threshold and whether the first wall temperature is greater than the dew point temperature; if the first cumulative exhaust heat is greater than the exhaust heat threshold and the first wall temperature is greater than the dew point temperature, the dew point state of the wide-range oxygen sensor is set to dew point pass, and the wide-range oxygen sensor is turned on; then a dew point reset judgment of the wide-range oxygen sensor is performed, specifically: after the wide-range oxygen sensor is turned on, judging whether the supply relationship characterization value is less than a preset characterization threshold and whether the third wall temperature at the installation position of the wide-range oxygen sensor is less than the dew point temperature; if the supply relationship characterization value is less than the preset characterization threshold, or the third wall temperature at the installation position of the wide-range oxygen sensor is less than the dew point temperature, the dew point state of the wide-range oxygen sensor is set to dew point fail, and the wide-range oxygen sensor is turned off, and the process returns to the step of judging the dew point pass of the wide-range oxygen sensor.

[0089] In one embodiment, the present invention further provides a controller for executing the steps in any one of the above-mentioned oxygen sensor control methods. The controller may be an ECU.

[0090] In one embodiment, the present invention further provides a vehicle comprising an oxygen sensor, an engine, an exhaust pipe, and the above-mentioned controller; wherein the oxygen sensor is mounted on the exhaust pipe of the engine, and the controller is used to perform the steps in any one of the above-mentioned oxygen sensor control methods.

[0091] In one embodiment, the present invention further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of any one of the above-mentioned oxygen sensor control methods are implemented.

[0092] Those skilled in the art will appreciate that all or part of the process steps of the above-described embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, such as a magnetic disk, an optical disk, a read-only memory, or a random access memory.

[0093] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. An oxygen sensor control method, characterized in that: The oxygen sensor is mounted on an exhaust pipe of an engine, and the method comprises: Obtaining a first accumulated exhaust heat and a first wall temperature at the oxygen sensor installation location; determining whether the first accumulated exhaust heat is greater than an exhaust heat threshold, and whether the first wall temperature is greater than a dew point temperature; If the first accumulated exhaust heat is greater than the exhaust heat threshold and the first wall temperature is greater than the dew point temperature, the oxygen sensor is turned on.

2. The oxygen sensor control method according to claim 1, characterized in that: The exhaust pipe further includes a catalyst; and obtaining a first accumulated exhaust heat at the oxygen sensor installation position includes: The first accumulated exhaust heat at the oxygen sensor installation location is determined by the following formula: ; in, is the first accumulated exhaust heat at the installation position of the oxygen sensor at the current moment; is the second accumulated exhaust heat at the oxygen sensor installation position at the previous moment; is the change in exhaust heat at the oxygen sensor installation location at the current moment; When the engine is in a stopped state, ,in, is the first wall temperature at the oxygen sensor installation location at the current moment; is the second wall temperature at the oxygen sensor installation position at the previous moment; is the heat coefficient corresponding to temperature change; When the engine is in operation, ,in, is the first exhaust gas mass flow in the exhaust pipe at the current moment; is the exhaust temperature in the exhaust pipe at the current moment; represents an exhaust temperature threshold value that brings heat to the installation location of the oxygen sensor; is the exhaust specific heat capacity; is an influencing factor on the change in exhaust heat when the catalyst is operating.

3. The oxygen sensor control method according to claim 1, characterized in that: The exhaust heat threshold is determined according to a third wall temperature at the oxygen sensor installation location when the engine is started, an engine cooling water temperature, and a number of repeated engine starts.

4. The oxygen sensor control method according to claim 1, characterized in that: The method further comprises: When the oxygen sensor is turned on, the stall information of the engine is determined in real time; Determining whether the stall information meets a preset condition; If the stall information satisfies a preset condition, the oxygen sensor is turned off, and the process returns to the step of obtaining the accumulated exhaust heat and the wall temperature at the oxygen sensor installation location.

5. The oxygen sensor control method according to claim 4, characterized in that: The stall information of the engine includes: a supply relationship characterization value, wherein the supply relationship characterization value is a ratio of the combustion heat of the engine and a corresponding coefficient of the second exhaust mass flow in the exhaust pipe; and determining whether the stall information meets a preset condition includes: Determining whether the supply relationship characterization value is less than a preset characterization threshold; If the stall information satisfies a preset condition, the oxygen sensor is turned off, and the process returns to the step of obtaining the accumulated exhaust heat and the wall temperature at the oxygen sensor installation location, including: If the supply relationship characterization value is less than the preset characterization threshold, the oxygen sensor is turned off, and the process returns to the step of obtaining the cumulative exhaust heat and the wall temperature at the oxygen sensor installation location.

6. The oxygen sensor control method according to claim 5, characterized in that: The preset characterization threshold is determined according to the ambient temperature.

7. The oxygen sensor control method according to claim 1, characterized in that: The method further comprises: When the oxygen sensor is turned on, the third wall temperature at the oxygen sensor installation position is obtained in real time; determining whether the third wall temperature is less than the dew point temperature; If the third wall temperature is lower than the dew point temperature, the oxygen sensor is turned off, and the process returns to the step of obtaining the accumulated exhaust heat and the wall temperature at the oxygen sensor installation location.

8. A controller, characterized in that: Used to execute the steps of the oxygen sensor control method according to any one of claims 1 to 7.

9. A vehicle, characterized in that: The vehicle comprises an oxygen sensor, an engine, an exhaust pipe, and the controller as claimed in claim 8; wherein the oxygen sensor is mounted on the exhaust pipe of the engine.

10. A computer-readable storage medium, characterized in that Used to store a computer-readable program, wherein when the program or instruction is executed by a processor, the steps of the oxygen sensor control method according to any one of claims 1 to 7 can be implemented.

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