Oxygen sensor heating method and device and medium

Abstract

The embodiment of the invention relates to an oxygen sensor heating method and device and a medium, and the method comprises the steps that after an engine in a vehicle is started, whether an exhaust system in the vehicle passes a dew point stage or not is monitored; before the dew point passing stage of the exhaust system, the real-time temperature of the oxygen sensor is obtained, and heating control is conducted on the oxygen sensor according to the comparison result of the real-time temperature and a first preset temperature threshold value; when the real-time temperature of the oxygen sensor is smaller than a first preset temperature threshold value, the oxygen sensor is heated based on the first preset voltage; when the real-time temperature of the oxygen sensor is larger than or equal to the first preset temperature threshold value, the first preset voltage is reduced according to the real-time temperature of the oxygen sensor and the first preset temperature threshold value, and the oxygen sensor is heated based on the reduced first preset voltage. In the technical scheme, before the dew point passing stage, the oxygen sensor is heated with a low voltage value, it is guaranteed that the temperature of the oxygen sensor is not higher than the first preset temperature threshold value, and damage to the oxygen sensor in the dew point passing stage is avoided.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle control technology, and in particular to an oxygen sensor heating method, device and medium. Background Art

[0002] The oxygen sensor is used in the feedback system of the electronically controlled fuel injection device in the electronic control system. The oxygen sensor is installed on the exhaust pipe to measure the oxygen content in the exhaust gas and determine whether the gasoline and air are completely burned to ensure that the three-way catalytic converter has the maximum conversion efficiency for hydrocarbons, carbon monoxide and nitrogen oxides in the exhaust gas. Therefore, it is very important to ensure that the oxygen sensor is not damaged.

[0003] In the related art, the oxygen sensor must reach a certain temperature to work properly, so it is common to heat the oxygen sensor to reach the working temperature.

[0004] However, during the heating process of the oxygen sensor, if its temperature is relatively high before the dew point stage, there is a risk of damage. For example, since the exhaust pipe in the exhaust system is in a slow heating state from cold to hot after the vehicle is started, the water vapor in the exhaust system will condense when it encounters the colder pipe wall. If the oxygen sensor is in a heating state at this time, the temperature of the ceramic body in the oxygen sensor rises to a certain temperature, the hotter oxygen sensor ceramic body will shatter due to thermal shock when it encounters condensed water, thereby causing damage to the oxygen sensor. Summary of the invention

[0005] In order to solve the above technical problem or at least partially solve the above-mentioned technical problem that during the heating process of the oxygen sensor, if its temperature is relatively high before the dew point stage, the hotter oxygen sensor ceramic body will be broken due to thermal shock when encountering condensed water, the present disclosure provides an oxygen sensor heating method, device and medium.

[0006] An embodiment of the present disclosure provides an oxygen sensor heating method, the method comprising the following steps: after an engine in a vehicle is started, monitoring whether an exhaust system in the vehicle passes a dew point stage; before the exhaust system passes the dew point stage, acquiring a real-time temperature of the oxygen sensor, and controlling the heating of the oxygen sensor according to a comparison result between the real-time temperature and a first preset temperature threshold; when the real-time temperature of the oxygen sensor is less than the first preset temperature threshold, heating the oxygen sensor based on a first preset voltage, wherein the first preset voltage is less than a preset voltage threshold; when the real-time temperature of the oxygen sensor is greater than or equal to the first preset temperature threshold, reducing the first preset voltage according to the real-time temperature of the oxygen sensor and the first preset temperature threshold, and heating the oxygen sensor based on the reduced first preset voltage.

[0007] The disclosed embodiment also provides an oxygen sensor heating device, the device comprising: a monitoring module, used to monitor whether the exhaust system in the vehicle passes the dew point stage after the engine in the vehicle is started; a heating processing module, used to obtain the real-time temperature of the oxygen sensor, and perform heating control on the oxygen sensor according to the comparison result between the real-time temperature and a first preset temperature threshold, the heating processing module is specifically used to heat the oxygen sensor based on a first preset voltage when the real-time temperature of the oxygen sensor is less than the first preset temperature threshold, wherein the first preset voltage is less than a preset voltage threshold, and when the real-time temperature of the oxygen sensor is greater than or equal to the first preset temperature threshold, the first preset voltage is reduced according to the real-time temperature of the oxygen sensor and the first preset temperature threshold, and the oxygen sensor is heated based on the reduced first preset voltage.

[0008] An embodiment of the present disclosure also provides a vehicle control device, which includes: a processor; a memory for storing executable instructions of the processor; the processor is used to read the executable instructions from the memory and execute the instructions to implement the oxygen sensor heating method provided in the embodiment of the present disclosure.

[0009] The embodiment of the present disclosure further provides a computer-readable storage medium, wherein the storage medium stores a computer program, and the computer program is used to execute the oxygen sensor heating method provided in the embodiment of the present disclosure.

[0010] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0011] After the engine in the vehicle is started, the exhaust system in the vehicle is monitored to see if it has passed the dew point stage. Before the exhaust system passes the dew point stage, the real-time temperature of the oxygen sensor is obtained, and the oxygen sensor is heated and controlled according to the comparison result between the real-time temperature and the first preset temperature threshold. When the real-time temperature of the oxygen sensor is less than the first preset temperature threshold, the oxygen sensor is heated by the first preset voltage, wherein the first preset voltage is less than the preset voltage threshold. When the real-time temperature of the oxygen sensor is greater than or equal to the first preset temperature threshold, the first preset voltage is reduced according to the real-time temperature of the oxygen sensor and the first preset temperature threshold, and the oxygen sensor is heated according to the reduced first preset voltage. In the technical solution, before the dew point stage, the oxygen sensor is heated with a lower voltage value to ensure that the temperature of the oxygen sensor is not higher than the first preset temperature threshold, thereby avoiding damage to the oxygen sensor during the dew point stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0013] Figure 1 A schematic diagram of a flow chart of an oxygen sensor heating method provided in an embodiment of the present disclosure;

[0014] Figure 2 A schematic flow chart of another oxygen sensor heating method provided in an embodiment of the present disclosure;

[0015] Figure 3 A schematic flow chart of another oxygen sensor heating method provided in an embodiment of the present disclosure;

[0016] Figure 4 A schematic diagram of a heating voltage curve of a front oxygen sensor provided in an embodiment of the present disclosure;

[0017] Figure 5 A schematic flow chart of another oxygen sensor heating method provided in an embodiment of the present disclosure;

[0018] Figure 6 A schematic diagram of a heating voltage curve of a rear oxygen sensor provided in an embodiment of the present disclosure;

[0019] Figure 7 A schematic structural diagram of an oxygen sensor heating device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0020] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are only for exemplary purposes and are not intended to limit the scope of protection of the present disclosure.

[0021] It should be understood that the various steps described in the method embodiments of the present disclosure may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present disclosure is not limited in this respect.

[0022] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0023] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0024] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0025] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0026] In order to solve the above problems, an embodiment of the present disclosure provides an oxygen sensor heating method, which is introduced below in conjunction with a specific embodiment.

[0027] Figure 1 The present invention provides a flow chart of an oxygen sensor heating method provided in an embodiment of the present invention. The method can be performed by an oxygen sensor heating device, wherein the device can be implemented by software and / or hardware and can generally be integrated into a vehicle control device. Figure 1 As shown, the method includes:

[0028] Step 101 , after the engine in the vehicle is started, monitoring whether the exhaust system in the vehicle passes the dew point stage.

[0029] It should be noted that after the engine in the vehicle is started, the temperature of the exhaust pipe in the exhaust system begins to rise. Before the dew point stage, due to the low temperature in the exhaust pipe, the exhaust gas will condense into water on the pipe wall when passing through the exhaust pipe. As the temperature of the exhaust pipe gradually rises, the gas condensed into water will begin to evaporate. After the temperature of the exhaust pipe wall rises to a certain value (for example, about 50°C), it will stagnate for a period of time due to the overlap of the condensation and evaporation of water vapor. This stage is called the dew point stage.

[0030] Among them, in different application scenarios, the methods of monitoring whether the exhaust system in the vehicle has passed the dew point stage are different, as shown below:

[0031] In some possible examples, the temperature of the exhaust pipe wall in the exhaust system of the vehicle may be monitored, and when the temperature of the exhaust pipe wall is greater than or equal to a preset dew point temperature threshold, it is determined that the exhaust system is in the dew point stage. When the temperature of the exhaust pipe wall is greater than or equal to the preset dew point temperature threshold, it indicates that the condensed water in the exhaust gas previously condensed on the exhaust pipe wall is being evaporated or has been evaporated.

[0032] In some possible examples, image information of the exhaust pipe wall can be collected by a camera pre-set near the exhaust pipe wall, and image analysis can be performed to determine whether condensed water in the exhaust gas previously condensed on the exhaust pipe wall is evaporating or has been evaporated. When the condensed water is evaporating or has been evaporated, it is determined that the exhaust system is in the dew point stage.

[0033] Step 102 : before the exhaust system passes the dew point stage, the real-time temperature of the oxygen sensor is obtained, and heating control of the oxygen sensor is performed according to a comparison result between the real-time temperature and a first preset temperature threshold.

[0034] Step 103 : When the real-time temperature of the oxygen sensor is less than a first preset temperature threshold, heating the oxygen sensor based on a first preset voltage, wherein the first preset voltage is less than a preset voltage threshold.

[0035] Step 104 , when the real-time temperature of the oxygen sensor is greater than or equal to a first preset temperature threshold, reducing the first preset voltage according to the real-time temperature of the oxygen sensor and the first preset temperature threshold, and heating the oxygen sensor based on the reduced first preset voltage.

[0036] It should be understood that steps 101 - 104 described in the method implementation of the present disclosure may be performed in different orders and / or in parallel.

[0037] In one embodiment of the present disclosure, before the exhaust system passes the dew point stage, the real-time temperature of the oxygen sensor is obtained, and the oxygen sensor is heated and controlled based on a comparison result between the real-time temperature and a first preset temperature threshold, that is, dynamic heating control of the oxygen sensor is implemented based on the above comparison result.

[0038] It can be understood that when it is known according to the comparison result that the real-time temperature of the oxygen sensor is greater than the first preset temperature threshold, the condensed water in the exhaust pipe drips onto the oxygen sensor, which may cause the ceramic body in the oxygen sensor to burst due to thermal influence and other damages. When it is known according to the comparison result that the real-time temperature of the oxygen sensor is not greater than the first preset temperature threshold, the temperature of the ceramic body of the oxygen sensor is relatively low and may not burst due to the drop of condensed water.

[0039] The first preset temperature threshold may be calibrated according to experimental data. In some possible embodiments, the first preset temperature threshold is 250°C.

[0040] Therefore, in this embodiment, when the real-time temperature of the oxygen sensor is lower than the first preset temperature threshold, the oxygen sensor is heated by the first preset voltage, wherein the first preset voltage is lower than the preset voltage threshold, and the preset voltage threshold may be a smaller value. Heating the oxygen sensor by the smaller first preset voltage may avoid the oxygen sensor having a higher temperature before the dew point stage.

[0041] In this embodiment, when the real-time temperature of the oxygen sensor is greater than or equal to the first preset temperature threshold, the first preset voltage can be further reduced, that is, the first preset voltage can be reduced according to the first preset temperature threshold, and the oxygen sensor can be heated according to the reduced first preset voltage. The first preset voltage is related to the model and type of the oxygen sensor, for example, in some possible embodiments, when the oxygen sensor is an LSU type front oxygen sensor, the first preset voltage can be 6V, etc., and when the oxygen sensor is an LSF type rear oxygen sensor, the first preset voltage can be 4V, etc.

[0042] It should be noted that in different application scenarios, the first preset voltage is reduced in different ways according to the real-time temperature of the oxygen sensor and the first preset temperature threshold. Different calculation methods have different advantages. In actual application, the specific way of reducing the first preset voltage can be selected according to the needs of the scenario. Examples are as follows:

[0043] In some possible embodiments, the first real-time temperature difference between the real-time temperature of the oxygen sensor and the first preset temperature threshold value may be determined, and the voltage reduction amount may be determined according to the first real-time temperature difference value. For example, a unit voltage reduction amount W1 corresponding to a unit temperature difference value may be preset, and the first real-time temperature difference value and W1 may be multiplied to determine the voltage reduction amount. Then, the first preset voltage may be reduced according to the calculated voltage reduction amount to obtain the reduced first preset voltage. In this embodiment, the voltage reduction amount is determined based on the first real-time temperature difference between the real-time temperature and the first preset temperature threshold value, and the first preset temperature threshold value is used as a reference, so that the greater the difference from the first preset temperature threshold value, the greater the degree of reduction of the first preset voltage, and the risk of damage to the real-time temperature of the oxygen sensor due to high temperature before the dew point stage is effectively avoided.

[0044] In some possible embodiments, a preset table may be queried according to the real-time temperature of the oxygen sensor, wherein the preset table contains a correspondence between the real-time temperature of the oxygen sensor and the voltage reduction amount, and the first preset voltage is reduced according to the queried voltage reduction amount. In this embodiment, the voltage reduction amount is determined based on the table lookup method, which improves the efficiency of determining the voltage reduction amount, thereby improving the efficiency of reducing the first preset voltage.

[0045] Of course, in the actual implementation process, if the temperature of the oxygen sensor is too low, in order to ensure that the oxygen sensor can quickly reach the working temperature, the first preset voltage can also be increased. For example, after the preset heating duration, if the real-time temperature of the oxygen sensor is less than the preset minimum temperature value (the minimum temperature value is usually less than the first preset temperature threshold, and the minimum temperature value is a small value, then when the real-time temperature is less than the minimum temperature value, it indicates that the temperature of the oxygen sensor is too low), the first preset voltage is increased, wherein the method for increasing the first preset voltage can refer to the method for reducing the first preset voltage, for example, the temperature difference between the first preset temperature threshold and the real-time temperature of the oxygen sensor can be calculated, and the voltage increase amount is determined according to the temperature difference, for example, the unit voltage increase amount W2 corresponding to the unit temperature difference is pre-set, and the temperature difference and W2 are multiplied to determine the voltage increase amount. Then, the first preset voltage is increased according to the calculated voltage increase amount. That is, when the temperature of the oxygen sensor is too low, in order to ensure that the oxygen sensor can quickly reach its working voltage, the first preset voltage is increased.

[0046] In general, in the embodiments of the present disclosure, in order to protect the oxygen sensor, a small voltage is used for heating before the dew point stage, and in order to ensure that the temperature of the oxygen sensor is not greater than the first preset temperature threshold, that is, to avoid the oxygen sensor from bursting and being damaged, the first preset voltage can also be adjusted in real time based on the real-time temperature of the oxygen sensor before the dew point. For example, when the first preset temperature threshold is 250°C, before the dew point stage, if the temperature of the ceramic inside the oxygen sensor exceeds 250°C, there is a risk of cracking, so the temperature of the ceramic body inside the oxygen sensor should be controlled to be lower than 250°C before the dew point. If the temperature of the ceramic body of the oxygen sensor exceeds 250°C, the first preset voltage needs to be reduced, that is, when the temperature of the oxygen sensor is too high, the first preset voltage is increased.

[0047] In summary, the oxygen sensor heating method of the embodiment of the present disclosure monitors whether the exhaust system in the vehicle has passed the dew point stage after the engine in the vehicle is started, obtains the real-time temperature of the oxygen sensor before the exhaust system passes the dew point stage, and controls the heating of the oxygen sensor according to the comparison result between the real-time temperature and the first preset temperature threshold, and heats the oxygen sensor based on the first preset voltage when the real-time temperature of the oxygen sensor is less than the first preset temperature threshold, wherein the first preset voltage is less than the preset voltage threshold, and when the real-time temperature of the oxygen sensor is greater than or equal to the first preset temperature threshold, reduces the first preset voltage according to the real-time temperature of the oxygen sensor and the first preset temperature threshold, and heats the oxygen sensor based on the reduced first preset voltage. In the present technical solution, before the dew point stage, the oxygen sensor is heated with a lower voltage value to ensure that the temperature of the oxygen sensor is not higher than the first preset temperature threshold, thereby avoiding damage to the oxygen sensor when the dew point stage is passed.

[0048] Based on the above embodiment, after the dew point stage, in order to make the oxygen sensor reach the operating temperature, the oxygen sensor is heated by the second preset voltage after the exhaust system passes the dew point stage, wherein the second preset voltage is greater than the first preset voltage. That is, in the embodiment of the present disclosure, after the dew point stage, the oxygen sensor is heated by the second preset voltage higher than the first preset voltage, and no longer continues to be heated by the lower first preset voltage, which accelerates the speed at which the oxygen sensor reaches the operating temperature while ensuring that the oxygen sensor is not damaged.

[0049] Among them, the second preset voltage may be related to the model and type of the oxygen sensor. For example, in some possible embodiments, when the oxygen sensor is an LSU-type front oxygen sensor, the second preset voltage may be 10V, etc., and when the oxygen sensor is an LSF-type rear oxygen sensor, the second preset voltage may be 8V, etc.

[0050] After jumping to the second preset voltage, the second preset voltage will not be continuously used for heating, because continuous heating with the higher second preset voltage will cause the oxygen sensor to be overheated. After heating with the second preset voltage, the heating voltage will be reduced when the corresponding conditions (the specific conditions are related to the oxygen sensor) are met, and finally the closed-loop heating stage will be entered. In the closed-loop heating stage, the temperature of the oxygen sensor will be controlled to be close to its operating target temperature.

[0051] Since different oxygen sensors are arranged at different positions in the exhaust system and have different internal structures, the above-mentioned heating process after switching to the second preset voltage is also different. The following takes the oxygen sensors including the front oxygen sensor and the rear oxygen sensor as examples to illustrate the subsequent heating process after heating with the second preset voltage, as follows:

[0052] In one embodiment of the present disclosure, when the oxygen sensor includes a front oxygen sensor, as shown in FIG. Figure 2 As shown, after the exhaust system passes the dew point stage, after heating the oxygen sensor by a second preset voltage, the method further includes:

[0053] Step 201 , determining whether the front oxygen sensor meets a preset condition for entering the heating phase.

[0054] In this embodiment, it is determined whether the front oxygen sensor meets the preset heating stage entry condition, wherein the preset heating stage entry condition includes:

[0055] The heating duration of the oxygen sensor is greater than a second preset duration, wherein the second preset duration may be calibrated according to scene requirements. In some possible embodiments, the second preset duration may be 8 seconds, etc.; and / or,

[0056] The real-time temperature of the oxygen sensor is greater than the second preset temperature threshold, wherein the second preset temperature threshold is greater than the first preset temperature threshold. The second preset temperature threshold can be calibrated according to the needs of the scene. In some possible embodiments, the second preset temperature threshold is 640°C. It should be noted that, since the exhaust system will heat the oxygen sensor with a second preset voltage greater than the first preset voltage after passing the dew point stage, the real-time temperature of the front oxygen sensor will increase rapidly and soon increase to a value greater than the first preset temperature threshold. However, in order to extend the heating time of the front oxygen sensor as much as possible and avoid the oxygen sensor reaching the operating temperature in a short time, which will cause the loss of the life of the oxygen sensor, it is also necessary to identify whether the real-time temperature of the front oxygen sensor is greater than the second preset temperature threshold, so that after it is greater than the second preset temperature threshold, the voltage for heating the front oxygen sensor can be reduced.

[0057] Among them, it should be emphasized that since a higher second preset voltage is used for heating in this stage, after continuously heating with the second preset voltage for the second preset time, the real-time temperature of the front oxygen sensor will most likely be greater than the second preset temperature threshold, or close to the second preset temperature threshold, etc., that is, the front oxygen sensor will usually meet the preset conditions for entering the heating stage.

[0058] Step 202, when the preset heating stage entry condition is met, the front oxygen sensor is heated according to a first preset duration and a third preset voltage, wherein the third preset voltage is greater than the first preset voltage, and the third preset voltage is less than the second preset voltage.

[0059] When the preset conditions for entering the heating stage are met, the front oxygen sensor is heated according to the first preset duration and the third preset voltage, wherein the third preset voltage can be set according to the scene. In some possible embodiments, the second preset voltage is 12V, the first preset voltage is 6V, the third preset voltage is 9V, etc. The above-mentioned first preset duration can be set according to the needs of the scene. In some possible embodiments, the first preset duration can be 1.5s, etc. Among them, in order to extend the duration of heating as much as possible and avoid the front oxygen sensor from overheating in a short period of time and causing it to exceed the operating temperature by a large margin, the first preset duration can also be adjusted according to the real-time temperature of the oxygen sensor, that is, the corresponding relationship between the real-time temperature of the oxygen sensor and the first preset duration is pre-set, and the corresponding relationship is queried based on the real-time temperature of the oxygen sensor to determine the first preset duration, etc.

[0060] That is, in this embodiment, after the front oxygen sensor is heated based on a higher second preset voltage, when the temperature of the front oxygen sensor reaches a second preset temperature threshold that is relatively close to the operating temperature, in order to prevent the temperature of the oxygen sensor from quickly exceeding the operating target temperature, it is necessary to start heating the front oxygen sensor with a relatively low third preset voltage.

[0061] Further, after a first preset time period, it is monitored whether the front oxygen sensor meets a preset front oxygen closed-loop heating phase entry condition.

[0062] Among them, in some possible embodiments, the preset front oxygen closed-loop heating stage entry conditions may include: the second real-time temperature difference between the real-time temperature of the front oxygen sensor and the preset working target temperature is less than the third preset temperature threshold value. When the real-time temperature of the front oxygen sensor is very close to the preset working target temperature, it is determined that the preset front oxygen closed-loop heating stage entry conditions are met, wherein the third preset temperature threshold value can be set according to scene requirements. For example, the preset working target temperature is 780°C, and the third preset temperature threshold value can be 5°C. Then, when the real-time temperature of the front oxygen sensor is greater than 775°C, it is determined that the preset front oxygen closed-loop heating stage entry conditions are met.

[0063] When the preset conditions for entering the front oxygen closed-loop heating stage are not met, the front oxygen sensor is heated according to the first preset unit time voltage increment and the third preset voltage, wherein the first preset unit time voltage increment can be set according to scene requirements, for example, the first preset unit time voltage increment is 0.3V / s.

[0064] That is, in this embodiment, when the preset front oxygen closed-loop heating stage entry conditions are not met, the heating voltage is increased incrementally with the third preset voltage as the initial voltage according to the first preset unit time voltage increment, and the heating voltage is increased to heat the front oxygen sensor. On the one hand, increasing the heating voltage of the front oxygen sensor ensures that the front oxygen sensor can quickly reach its operating temperature. On the other hand, increasing the heating voltage of the front oxygen sensor is a gradient increase to avoid directly heating the front oxygen sensor with a higher heating voltage, which may cause the front oxygen sensor to exceed its operating temperature, thereby affecting the life of the front oxygen sensor.

[0065] Of course, in the actual implementation process, the heating voltage will not be increased indefinitely. When the heating voltage is increased according to the first preset unit time voltage increment, if the heating voltage reaches the preset maximum heating voltage (which can be set according to the scene requirements, for example, it can be 12V), the heating voltage will no longer be increased but the heating will continue at the maximum heating voltage. Alternatively, after the heating voltage reaches the preset maximum heating voltage, the above-mentioned preset front oxygen closed-loop heating stage is directly entered, wherein, when the heating voltage reaches the preset maximum heating voltage, the difference between the real-time temperature of the front oxygen sensor and the second real-time temperature of the preset working target temperature is usually less than the third preset temperature threshold, or the difference between the real-time temperature of the front oxygen sensor and the second real-time temperature of the preset working target temperature and the third preset temperature threshold is smaller (in the above two cases, it can also be considered that the preset front oxygen closed-loop heating stage entry conditions are met).

[0066] When the preset front oxygen closed-loop heating stage entry conditions are met, the real-time temperature of the front oxygen sensor and the second real-time temperature difference of the preset working target temperature of the front oxygen sensor are monitored, the real-time heating voltage of the front oxygen sensor is determined according to the second real-time temperature difference and the first preset control factor, and the front oxygen sensor is heated according to the real-time heating voltage of the front oxygen sensor. That is, in the preset front oxygen closed-loop heating stage, the real-time heating voltage is dynamically adjusted according to the second real-time temperature difference to achieve closed-loop control.

[0067] The first preset control factor may be pre-calibrated according to experimental data. The first preset control factor is used to normalize the second real-time temperature difference and to convert the second real-time temperature difference into a corresponding real-time heating voltage.

[0068] In some possible embodiments, Figure 3 As shown, the step of determining the real-time heating voltage of the front oxygen sensor according to the second real-time temperature difference and the first preset control factor includes:

[0069] Step 301, calculating a first product value of a second real-time temperature difference and a first preset control factor.

[0070] After the second real-time temperature difference is obtained, a first product value of the second real-time temperature difference and the first preset control factor is calculated.

[0071] Among them, in some possible embodiments, in order to avoid high-amplitude oscillation of the heating voltage, when the amplitude of the heating voltage exceeds the preset amplitude threshold, it is confirmed that high-amplitude oscillation occurs. Thus, in order to avoid high-amplitude oscillation, the first preset control factor can be reduced, that is, after the high-amplitude oscillation occurs, the amplitude difference between the amplitude of the heating voltage (which can be the average amplitude) and the preset amplitude threshold is calculated, and the preset corresponding relationship is queried to determine the control factor reduction value corresponding to the amplitude difference. The first preset control factor is reduced according to the control factor reduction value, and the reduced first preset control factor is used to participate in the calculation of the real-time heating voltage at the next moment.

[0072] Step 302 : Calculate the difference between the historical heating voltage of the front oxygen sensor at the last moment and the first product value to determine the real-time heating voltage of the front oxygen sensor.

[0073] After obtaining the first product value, the difference between the historical heating voltage of the front oxygen sensor at the previous moment and the first product value is calculated to determine the real-time heating voltage of the front oxygen sensor. Since the real-time temperature difference can be positive or negative, the determined real-time heating voltage can be smaller or larger than the heating voltage at the previous moment.

[0074] Among them, in some possible embodiments, in order to avoid the real-time heating voltage reaching the preset maximum heating voltage after the heating voltage is increased according to the first preset unit time voltage increment in the above-mentioned gradient heating stage, causing the front oxygen sensor to exceed its operating temperature, thereby affecting the service life of the front oxygen sensor, when entering the preset front oxygen closed-loop heating stage, the real-time heating voltage can also be reduced to a fifth preset voltage, wherein the fifth preset voltage can be a smaller value relative to the maximum heating voltage, and the fifth preset voltage is greater than the first preset voltage, for example, the fifth preset voltage can be 8.2V, etc.

[0075] In this embodiment, the historical heating voltage of the front oxygen sensor at the last moment that is first obtained in the preset front oxygen closed-loop heating stage may be 8.2V.

[0076] Based on the above, the heating process of the front oxygen sensor can be regarded as two parts, one part is the open-loop control stage after starting, and the other part is the preset front oxygen closed-loop heating stage, wherein the open-loop control stage can be divided into a curve heating stage, a holding heating stage and a gradient heating stage, wherein in the curve heating stage, heating is ensured with a smaller first preset voltage before the dew point stage, to avoid the temperature of the front oxygen sensor being greater than the first preset temperature threshold before the dew point stage, and after the dew point stage, the first preset voltage is quickly increased to the second preset voltage to achieve rapid heating of the front oxygen sensor, and after rapid heating to the second preset temperature threshold, the holding heating stage is entered. stage, that is, in order to prolong the heating process and avoid the real-time temperature of the front oxygen sensor being greater than the preset working temperature, the second preset voltage is reduced to the third preset voltage for continuous heating for a period of time, and then, in order to allow the front oxygen sensor to enter the preset front oxygen closed-loop heating stage, the real-time heating voltage of the front oxygen sensor is increased in a gradient increasing manner in the gradient heating stage to enter the preset front oxygen closed-loop heating stage, and the real-time heating voltage is closed-loop controlled based on the second real-time temperature difference between the real-time temperature of the front oxygen sensor and the preset working target temperature of the front oxygen sensor in the preset front oxygen closed-loop heating stage to ensure that the real-time temperature of the front oxygen sensor is near its preset working target temperature.

[0077] The following is a specific example to illustrate the heating process of the front oxygen sensor: Figure 4 As shown, after the engine in the vehicle is started, the exhaust system in the vehicle is monitored to see if it passes the dew point stage. Before the exhaust system passes the dew point stage, when the real-time temperature of the front oxygen sensor is less than 250°C (a first preset temperature threshold), the front oxygen sensor is heated by a heating voltage of 6V (a first preset voltage). When the real-time temperature of the front oxygen sensor is greater than or equal to 250°C, the heating voltage is adjusted according to the real-time temperature of the front oxygen sensor and 250°C, and the adjusted heating voltage is less than 6V.

[0078] After the dew point stage, the heating voltage is increased to 12V (the second preset voltage). If this stage lasts for 8s (the second preset duration) or the real-time temperature of the front oxygen sensor is greater than 640°C (the second preset temperature threshold), the heating maintenance stage can be entered. In this heating maintenance stage, the front oxygen sensor is heated at 1.5s (the first preset duration) and 9V (the third preset voltage). After 1.5s, the gradient heating stage is entered. In the gradient heating stage, the heating voltage is increased by 0.3V / s (the first preset voltage increment per unit time) until it reaches 12V. If the temperature of the oxygen sensor is greater than 775°C, the preset front oxygen closed-loop heating stage is entered. When entering the preset front oxygen closed-loop heating stage, in order to avoid the oxygen sensor from being continuously heated at the maximum heating voltage of 12V, the heating voltage can be reduced to 8.2V (the fifth preset voltage). Then, the second real-time temperature difference between the real-time temperature of the front oxygen sensor and the preset operating target temperature of the front oxygen sensor is monitored, the real-time heating voltage of the front oxygen sensor is determined according to the second real-time temperature difference, and the front oxygen sensor is heated according to the real-time heating voltage of the front oxygen sensor.

[0079] In another embodiment of the present disclosure, when the oxygen sensor includes a rear oxygen sensor, as shown in FIG. Figure 5 As shown, after the exhaust system passes the dew point stage, after heating the oxygen sensor by a second preset voltage, the method further includes:

[0080] Step 501 : heating the rear oxygen sensor according to the second preset voltage increment per unit time and the fourth preset voltage, and monitoring whether the real-time heating voltage of the rear oxygen sensor is greater than or equal to the second preset voltage when heating the rear oxygen sensor.

[0081] The second preset voltage increment per unit time may be calibrated according to the scenario. For example, in some possible application scenarios, the second preset voltage increment per unit time may be 0.5 V / s.

[0082] In this embodiment, according to the second preset voltage increment per unit time, with the fourth preset voltage as the starting voltage, the heating voltage is gradually increased to achieve heating of the rear oxygen sensor, and in order to avoid the loss of the oxygen sensor due to excessive heating voltage, when the rear oxygen sensor is heated, it is monitored whether the real-time heating voltage of the rear oxygen sensor is greater than or equal to the second preset voltage, wherein the second preset voltage can be set according to the needs of the scene. In some possible embodiments, the second preset voltage is 10.5V.

[0083] Step 502 : When the real-time heating voltage of the rear oxygen sensor is greater than or equal to the second preset voltage, the rear oxygen sensor is heated according to the second preset voltage and a third preset time.

[0084] When the real-time heating voltage of the rear oxygen sensor is greater than or equal to the second preset voltage, in order to quickly increase the temperature of the rear oxygen sensor to quickly reach the preset operating target temperature of the rear oxygen sensor, the rear oxygen sensor is continuously heated for a third preset time according to the second preset voltage. The third preset time can be set according to the scene requirements, for example, the third preset time is 26s.

[0085] Further, in order to prevent the temperature from quickly exceeding the preset operating target temperature of the rear oxygen sensor, reduced voltage heating may be started.

[0086] Specifically, after heating for a third preset time according to the second preset voltage, the voltage of the rear oxygen sensor is reduced with the second preset voltage as the starting voltage, wherein the method of reducing the voltage can be set according to the needs of the scene. In some possible embodiments, the voltage can be reduced with the second preset voltage as the initial voltage according to the preset unit time voltage reduction amount, wherein the preset unit time voltage reduction amount can be set according to the needs of the scene. In some possible embodiments, the preset unit time voltage reduction amount is 0.3V / s, etc.

[0087] In this embodiment, when the voltage reduction process is performed, it is monitored whether the vehicle meets the preset feedforward control stage entry conditions. For example, in some possible embodiments, a real-time table lookup voltage corresponding to the real-time reference voltage can be obtained. When the real-time reference voltage reduced by the above voltage reduction process is less than the corresponding real-time table lookup voltage, it can be considered that the preset feedforward control stage entry conditions are met. When the preset feedforward control stage entry conditions are met, the real-time table lookup voltage of the rear oxygen sensor is obtained, and the rear oxygen sensor is heated according to the real-time table lookup voltage. In this implementation, after the preset feedforward control stage entry conditions are met, it is considered that the real-time reference voltage reduced by the voltage reduction process of the rear oxygen sensor may be smaller than the table lookup voltage. Therefore, in order to balance the time it takes for the rear oxygen sensor to reach the operating temperature, the rear oxygen sensor is heated according to the real-time table lookup voltage, that is, the larger value of the real-time reference voltage and the real-time table lookup voltage is used to heat the rear oxygen sensor.

[0088] In one embodiment of the present disclosure, the current exhaust temperature and the current exhaust flow of the exhaust system may be obtained, and a preset table may be queried according to the current exhaust temperature and the current exhaust flow to obtain a real-time table lookup voltage.

[0089] In this embodiment, a possible preset table may be shown in Table 1 below, where the horizontal coordinate of the preset table is the exhaust flow rate (corresponding to the X-axis in Table 1, in units of L), and the vertical coordinate is the exhaust temperature (corresponding to the Y-axis in Table 1, in units of ° C). Thus, the preset table may be queried based on the current exhaust temperature and the current exhaust flow rate to obtain the real-time table lookup voltage, wherein the unit of the real-time table lookup voltage is V:

[0090] Table 1

[0091]

[0092] Among them, the relevant data in the constructed preset table can be calibrated on the hub.

[0093] In one embodiment of the present disclosure, if it is determined that the rear oxygen sensor does not meet the preset feedforward control stage entry conditions, it is considered that the real-time reference voltage to which the rear oxygen sensor voltage is reduced during the voltage reduction process may be relatively large relative to the table lookup voltage. Therefore, in order to balance the time it takes for the rear oxygen sensor to reach the operating temperature, the rear oxygen sensor is heated according to the real-time reference voltage, that is, the larger value of the real-time reference voltage and the real-time table lookup voltage is used to heat the rear oxygen sensor.

[0094] Furthermore, in an embodiment of the present disclosure, after entering the preset feedforward control stage, it is also monitored whether the rear oxygen sensor meets the preset rear oxygen closed-loop heating stage entry condition, wherein the preset rear oxygen closed-loop heating stage entry condition can be set according to the scenario. For example, in some possible embodiments, when the difference between the real-time temperature of the rear oxygen sensor and the preset operating target temperature of the rear oxygen sensor is less than a predetermined value, it is considered that the preset rear oxygen closed-loop heating stage entry condition is met; for another example, when the heating duration is greater than the preset time threshold and the heating of the rear oxygen sensor cannot be stopped due to the high exhaust temperature in the exhaust pipe, it is considered that the preset rear oxygen closed-loop heating stage entry condition is met.

[0095] In some possible embodiments, after the preset rear oxygen closed-loop heating stage entry conditions are met, the real-time resistance difference between the real-time heating resistance of the rear oxygen sensor and the preset standard heating resistance of the rear oxygen sensor is monitored, the real-time heating voltage of the rear oxygen sensor is determined according to the real-time resistance difference and the second preset control factor, and the rear oxygen sensor is heated according to the real-time heating voltage of the rear oxygen sensor. That is, in this embodiment, the real-time heating voltage of the rear oxygen sensor is dynamically adjusted according to the real-time resistance difference and the second preset control factor to achieve closed-loop control of the rear oxygen sensor. According to experimental data, the closed-loop control of the rear oxygen sensor keeps the temperature constant during driving, effectively preventing the rear oxygen sensor from being damaged due to excessive exhaust temperature. Among them, the second preset control factor can be calibrated according to experimental data, and the second preset control factor is used to normalize the real-time resistance difference into the real-time heating voltage, wherein the real-time resistance difference reflects the difference between the real-time heating resistance of the rear oxygen sensor and the preset standard heating resistance of the rear oxygen sensor, that is, reflects the difference between the actual heating resistance and the theoretical heating resistance. The real-time heating voltage determined based on this difference can ensure that when the rear oxygen sensor is heated according to the determined real-time heating voltage, the rear oxygen sensor will not be damaged due to excessive temperature.

[0096] Among them, the step of determining the real-time heating voltage of the rear oxygen sensor according to the real-time resistance difference and the second preset control factor may include: calculating the second product value of the real-time resistance difference and the second preset control factor, calculating the difference between the heating voltage of the rear oxygen sensor at the previous moment and the second product value, so as to determine the real-time heating voltage of the rear oxygen sensor.

[0097] Based on the above, the heating process of the rear oxygen sensor can be regarded as two parts, one is the heating control stage after starting, and the other is the heating stage during the vehicle driving process. In the heating control stage after starting, heating is performed with a smaller first preset voltage before the dew point stage to avoid the temperature of the rear oxygen sensor being greater than the first preset temperature threshold before the dew point stage. After the dew point stage, the first preset voltage is quickly increased to the second preset voltage to achieve rapid heating of the rear oxygen sensor. Furthermore, in order to avoid the rear oxygen sensor exceeding its operating temperature, after heating for a third preset time based on the second preset voltage, the voltage reduction process of the rear oxygen sensor is performed with the second preset voltage as the starting voltage. When the vehicle enters the driving state, it is first determined whether the rear oxygen sensor meets the preset feedforward control stage entry condition. When the preset feedforward control stage entry condition is met, the real-time table lookup voltage of the rear oxygen sensor is obtained, and the rear oxygen sensor is heated according to the real-time table lookup voltage. After the preset rear oxygen closed-loop heating stage entry condition is met, the closed-loop control of the rear oxygen sensor heating is started based on the real-time resistance difference between the real-time heating resistor of the rear oxygen sensor and the preset standard heating resistor of the rear oxygen sensor. Among them, in the preset rear oxygen closed loop heating stage, the temperature of the rear oxygen sensor is usually near its preset working target temperature. That is, the heating stage during vehicle driving can be divided into a preset feedforward control stage and a preset rear oxygen closed loop heating stage.

[0098] The following is a specific example to illustrate: Figure 6 As shown, after the engine in the vehicle is started, the exhaust system in the vehicle is monitored to see if it passes the dew point stage. Before the exhaust system passes the dew point stage, when the real-time temperature of the rear oxygen sensor is less than 250°C (a first preset temperature threshold), the rear oxygen sensor is heated by a heating voltage of 4V (a first preset voltage). When the real-time temperature of the oxygen sensor is greater than or equal to 250°C, the heating voltage is adjusted according to the real-time temperature of the oxygen sensor and 250°C, and the adjusted heating voltage is less than 4V.

[0099] After the dew point stage, the heating voltage is increased to 8V (the fourth preset voltage), and then the heating voltage for heating the rear oxygen sensor is increased from 8V according to 0.5V / s (the second preset voltage increment per unit time). When it is increased to 10.5V (the second preset voltage), heating is continued for 26s (the third preset duration). Then, the real-time heating voltage of the rear oxygen sensor is reduced with the second preset voltage as the initial voltage. When the voltage reduction process is performed, it is monitored whether the rear oxygen sensor meets the preset feedforward control stage entry conditions, that is, whether the real-time reference heating voltage is less than the real-time table lookup voltage. When the real-time reference heating voltage is less than the real-time table lookup voltage, the rear oxygen sensor is heated according to the real-time table lookup voltage. When the real-time reference heating voltage is greater than or equal to the real-time table lookup voltage, the rear oxygen sensor is heated according to the real-time reference heating voltage.

[0100] Monitor whether the rear oxygen sensor meets the preset rear oxygen closed-loop heating stage entry conditions. After the preset rear oxygen closed-loop heating stage entry conditions are met, monitor the real-time resistance difference between the real-time heating resistance of the rear oxygen sensor and the preset standard heating resistance of the rear oxygen sensor, determine the real-time heating voltage of the rear oxygen sensor according to the real-time resistance difference, and heat the rear oxygen sensor according to the real-time heating voltage of the rear oxygen sensor.

[0101] In summary, the oxygen sensor heating method of the embodiment of the present disclosure selects different heating strategies for heating treatment based on the type of oxygen sensor after the dew point stage, thereby ensuring that the oxygen sensor can quickly reach the operating target voltage while avoiding damage to the oxygen sensor.

[0102] In order to implement the above embodiments, the present disclosure also proposes an oxygen sensor heating device. Figure 7 This is a schematic diagram of the structure of an oxygen sensor heating device provided by an embodiment of the present disclosure. The device can be implemented by software and / or hardware and can generally be integrated into a vehicle control device. Figure 7 As shown, the device includes: a monitoring module 710 and a heating processing module 720, wherein:

[0103] A monitoring module 710 is used to monitor whether the exhaust system in the vehicle passes the dew point stage after the engine in the vehicle is started;

[0104] The heating processing module 720 is used to obtain the real-time temperature of the oxygen sensor and perform heating control on the oxygen sensor according to the comparison result between the real-time temperature and the first preset temperature threshold.

[0105] The heating processing module 720 is specifically used to heat the oxygen sensor based on a first preset voltage when the real-time temperature of the oxygen sensor is less than a first preset temperature threshold, wherein the first preset voltage is less than the preset voltage threshold, and when the real-time temperature of the oxygen sensor is greater than or equal to the first preset temperature threshold, the first preset voltage is reduced according to the real-time temperature of the oxygen sensor and the first preset temperature threshold, and the oxygen sensor is heated based on the reduced first preset voltage.

[0106] The oxygen sensor heating device provided in the embodiments of the present disclosure can execute the oxygen sensor heating method provided in any embodiment of the present disclosure, and has the corresponding functional modules and beneficial effects of the execution method.

[0107] In order to implement the above embodiments, the present disclosure further proposes a computer program product, including a computer program / instruction, which implements the oxygen sensor heating method in the above embodiments when executed by a processor.

[0108] In order to achieve the above-mentioned embodiment, the present disclosure also proposes a vehicle control device that heats an oxygen sensor by executing the above-mentioned oxygen sensor heating method.

[0109] In order to implement the above embodiments, the present disclosure further proposes a computer-readable storage medium, which stores a computer program for executing the oxygen sensor heating method provided in the embodiments of the present disclosure.

[0110] It should be noted that the computer-readable medium disclosed above may be a computer-readable signal medium or a computer-readable storage medium or any combination of the above two. The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or device, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In the present disclosure, a computer-readable storage medium may be any tangible medium containing or storing a program that may be used by or in combination with an instruction execution system, device or device. In the present disclosure, a computer-readable signal medium may include a data signal propagated in a baseband or as part of a carrier wave, in which a computer-readable program code is carried. This propagated data signal may take a variety of forms, including but not limited to an electromagnetic signal, an optical signal, or any suitable combination of the above. The computer readable signal medium may also be any computer readable medium other than a computer readable storage medium, which may send, propagate or transmit a program for use by or in conjunction with an instruction execution system, apparatus or device. The program code contained on the computer readable medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (radio frequency), etc., or any suitable combination of the above.

[0111] The computer-readable medium may be included in the vehicle control device; or may exist independently without being assembled into the vehicle control device.

[0112] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present disclosure. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some implementations as replacements, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0113] The units involved in the embodiments described in the present disclosure may be implemented by software or hardware, wherein the name of a unit does not, in some cases, limit the unit itself.

[0114] The functions described above herein may be performed at least in part by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), complex programmable logic devices (CPLDs), and the like.

[0115] In the context of the present disclosure, a machine-readable medium may be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, device, or equipment. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or equipment, or any suitable combination of the foregoing. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0116] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution.

[0117] In addition, although each operation is described in a specific order, this should not be understood as requiring these operations to be performed in the specific order shown or in a sequential order. Under certain circumstances, multitasking and parallel processing may be advantageous. Similarly, although some specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present disclosure. Some features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination mode.

[0118] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. A method for heating an oxygen sensor, characterized in that: The following steps are involved: After an engine in a vehicle is started, monitoring whether an exhaust system in the vehicle passes a dew point stage; Before the exhaust system passes through the dew point stage, obtaining a real-time temperature of an oxygen sensor, and performing heating control on the oxygen sensor according to a comparison result between the real-time temperature and a first preset temperature threshold; When the real-time temperature of the oxygen sensor is less than a first preset temperature threshold, heating the oxygen sensor based on a first preset voltage, wherein the first preset voltage is less than a preset voltage threshold; When the real-time temperature of the oxygen sensor is greater than or equal to the first preset temperature threshold, the first preset voltage is reduced according to the real-time temperature of the oxygen sensor and the first preset temperature threshold, and the oxygen sensor is heated based on the reduced first preset voltage.

2. The method according to claim 1, characterized in that The step of reducing the first preset voltage according to the real-time temperature of the oxygen sensor and the first preset temperature threshold comprises: determining a first real-time temperature difference between the real-time temperature of the oxygen sensor and the first preset temperature threshold; determining a voltage reduction amount according to the first real-time temperature difference; The first preset voltage is reduced according to the voltage reduction amount to obtain the reduced first preset voltage.

3. The method according to claim 1 or 2, characterized in that Also includes: After the exhaust system passes the dew point stage, the oxygen sensor is heated by a second preset voltage, wherein the second preset voltage is greater than the first preset voltage.

4. The method according to claim 3, characterized in that When the oxygen sensor includes a front oxygen sensor, it further includes: determining whether the front oxygen sensor meets a preset condition for entering the heating stage; When the preset heating stage entry condition is met, the front oxygen sensor is heated according to a first preset duration and a third preset voltage, wherein the third preset voltage is greater than the first preset voltage, and the third preset voltage is less than the second preset voltage.

5. The method according to claim 4, characterized in that The preset conditions for entering the heating stage include: The heating duration of the oxygen sensor is greater than a second preset duration; and / or, The real-time temperature of the oxygen sensor is greater than a second preset temperature threshold, wherein the second preset temperature threshold is greater than the first preset temperature threshold.

6. The method according to claim 4, characterized in that Also includes: After heating for the first preset time period, monitoring whether the front oxygen sensor meets a preset front oxygen closed-loop heating phase entry condition; When the preset front oxygen closed-loop heating stage entry condition is not met, heating the front oxygen sensor according to the first preset voltage increment per unit time and the third preset voltage; When the preset front oxygen closed-loop heating stage entry condition is met, monitoring a second real-time temperature difference between the real-time temperature of the front oxygen sensor and the preset working target temperature of the front oxygen sensor; A real-time heating voltage of the front oxygen sensor is determined according to the second real-time temperature difference and a first preset control factor, and the front oxygen sensor is heated according to the real-time heating voltage of the front oxygen sensor.

7. The method according to claim 3, characterized in that When the oxygen sensor includes a rear oxygen sensor, it further includes: After heating for a third preset time period according to the second preset voltage, performing a voltage reduction process on the rear oxygen sensor with the second preset voltage as a starting voltage; When performing the voltage reduction process, monitoring whether the rear oxygen sensor meets a preset feedforward control phase entry condition; When the preset feedforward control stage entry condition is met, the real-time table lookup voltage of the rear oxygen sensor is obtained, and the rear oxygen sensor is heated according to the real-time table lookup voltage.

8. The method according to claim 7, characterized in that The preset feedforward control stage entry conditions include: The voltage reduction process reduces the voltage to a real-time reference voltage that is smaller than the corresponding real-time table lookup voltage.

9. The method according to claim 7, characterized in that Also includes: monitoring whether the rear oxygen sensor meets a preset rear oxygen closed-loop heating phase entry condition; After the preset rear oxygen closed-loop heating stage entry condition is met, monitoring the real-time resistance difference between the real-time heating resistance of the rear oxygen sensor and the preset standard heating resistance of the rear oxygen sensor; The real-time heating voltage of the rear oxygen sensor is determined according to the real-time resistance difference and a second preset control factor, and the rear oxygen sensor is heated according to the real-time heating voltage of the rear oxygen sensor.

10. The method according to claim 7, characterized in that The obtaining of the real-time table lookup voltage of the rear oxygen sensor includes: Acquiring a current exhaust temperature and a current exhaust flow rate of the exhaust system; A preset table is queried according to the current exhaust temperature and the current exhaust flow rate to obtain the real-time table lookup voltage.

11. An oxygen sensor heating device, characterized in that: include: A monitoring module, for monitoring whether an exhaust system in the vehicle passes a dew point stage after an engine in the vehicle is started; a heating processing module, used for obtaining the real-time temperature of the oxygen sensor and performing heating control on the oxygen sensor according to a comparison result between the real-time temperature and a first preset temperature threshold, The heating processing module is specifically used to heat the oxygen sensor based on a first preset voltage when the real-time temperature of the oxygen sensor is less than a first preset temperature threshold, wherein the first preset voltage is less than a preset voltage threshold, and when the real-time temperature of the oxygen sensor is greater than or equal to the first preset temperature threshold, the first preset voltage is reduced according to the real-time temperature of the oxygen sensor and the first preset temperature threshold, and the oxygen sensor is heated based on the reduced first preset voltage.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and the computer program is used to execute the oxygen sensor heating method according to any one of claims 1 to 10.

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