Wide-range oxygen sensor start-up control method and device

Abstract

This invention discloses a wide-range oxygen sensor start-up control method and device. The invention relates to the field of diesel engine control technology, and includes: preheating the wide-range oxygen sensor after power-on, and collecting the exhaust temperature and flow rate of the exhaust pipe during the preheating process; calculating the exhaust heat and heat threshold of the exhaust pipe based on the exhaust temperature and flow rate; detecting whether condensate droplets will form in the exhaust pipe based on the exhaust heat and heat threshold; if condensate droplets form in the exhaust pipe, controlling the wide-range oxygen sensor to stop working and restart; if no condensate droplets form in the exhaust pipe, controlling the wide-range oxygen sensor to heat up rapidly until the temperature of the wide-range oxygen sensor reaches the operating temperature, thus completing the start-up. By applying the technical solution of this application, damage to the wide-range oxygen sensor due to thermal shock from condensate droplets can be avoided.

Description

Technical Field

[0001] This invention relates to the field of diesel engine control technology, and more specifically, to a wide-range oxygen sensor start-up control method and device. Background Technology

[0002] Diesel engines generally employ turbocharging and lean combustion, requiring a wide-range oxygen sensor to detect the oxygen concentration in the exhaust pipe in order to achieve closed-loop control of the air-fuel ratio.

[0003] Currently, after the engine starts, the wide-range oxygen sensor is typically heated directly to the high temperature required for operation. However, if there are condensation droplets in the pipes, the ceramic surface of the wide-range oxygen sensor, which is directly heated to the required operating temperature, is likely to be damaged by the thermal shock of the condensation droplets. Summary of the Invention

[0004] This invention provides a method and apparatus for controlling the start-up of a wide-range oxygen sensor, which mainly avoids damage to the wide-range oxygen sensor from thermal shock caused by condensation droplets.

[0005] According to a first aspect of the present invention, a wide-range oxygen sensor start-up control method is provided, comprising:

[0006] The wide-range oxygen sensor is preheated after being powered on, and the exhaust temperature and exhaust flow rate of the exhaust pipe are collected during the preheating process.

[0007] Based on the exhaust temperature and the exhaust flow rate, calculate the exhaust heat and heat threshold of the exhaust pipe, respectively;

[0008] Based on the exhaust heat and the heat threshold, detect whether condensate droplets will form in the exhaust pipe;

[0009] If condensation droplets form in the exhaust pipe, the wide-range oxygen sensor will stop working and restart.

[0010] If no condensate droplets form in the exhaust pipe, the wide-range oxygen sensor is controlled to heat up rapidly until its temperature reaches the operating temperature, at which point the startup is complete.

[0011] According to a second aspect of the present invention, a wide-range oxygen sensor start-up control device is provided, comprising:

[0012] The preheating unit is used to preheat the wide-range oxygen sensor after it is powered on, and to collect the exhaust temperature and exhaust flow rate of the exhaust pipe during the preheating process.

[0013] The calculation unit is used to calculate the exhaust heat and heat threshold of the exhaust pipe based on the exhaust temperature and the exhaust flow rate, respectively.

[0014] The detection unit is used to detect whether condensate droplets will form in the exhaust pipe based on the exhaust heat and the heat threshold.

[0015] The control unit is configured to stop the wide-range oxygen sensor from operating and restart it if condensation droplets form in the exhaust pipe.

[0016] The control unit is configured to control the wide-range oxygen sensor to heat up rapidly if no condensation droplets form in the exhaust pipe, until the temperature of the wide-range oxygen sensor reaches the operating temperature, and then complete the startup.

[0017] According to a third aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, performs the following steps:

[0018] The wide-range oxygen sensor is preheated after being powered on, and the exhaust temperature and exhaust flow rate of the exhaust pipe are collected during the preheating process.

[0019] Based on the exhaust temperature and the exhaust flow rate, calculate the exhaust heat and heat threshold of the exhaust pipe, respectively;

[0020] Based on the exhaust heat and the heat threshold, detect whether condensate droplets will form in the exhaust pipe;

[0021] If condensation droplets form in the exhaust pipe, the wide-range oxygen sensor will stop working and restart.

[0022] If no condensate droplets form in the exhaust pipe, the wide-range oxygen sensor is controlled to heat up rapidly until its temperature reaches the operating temperature, at which point the startup is complete.

[0023] According to a fourth aspect of the present invention, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to perform the following steps:

[0024] The wide-range oxygen sensor is preheated after being powered on, and the exhaust temperature and exhaust flow rate of the exhaust pipe are collected during the preheating process.

[0025] Based on the exhaust temperature and the exhaust flow rate, calculate the exhaust heat and heat threshold of the exhaust pipe, respectively;

[0026] Based on the exhaust heat and the heat threshold, detect whether condensate droplets will form in the exhaust pipe;

[0027] If condensation droplets form in the exhaust pipe, the wide-range oxygen sensor will stop working and restart.

[0028] If no condensate droplets form in the exhaust pipe, the wide-range oxygen sensor is controlled to heat up rapidly until its temperature reaches the operating temperature, at which point the startup is complete.

[0029] The innovative aspects of this invention include:

[0030] 1. Adding condensation droplet detection during the preheating process to prevent the wide-range oxygen sensor from being damaged by the thermal shock of condensation droplets is one of the innovative features of this invention.

[0031] 2. One of the innovative aspects of this invention is that after the wide-range oxygen sensor enters normal operating mode, it continues to detect condensate droplets to ensure the safe operation of the wide-range oxygen sensor.

[0032] 3. One of the innovative aspects of this invention is the use of PID control mode to precisely control the temperature of the wide-range oxygen sensor.

[0033] This invention provides a wide-range oxygen sensor start-up control method and apparatus. Compared with existing technologies that directly control the wide-range oxygen sensor to heat up to the required operating temperature, this method preheats the wide-range oxygen sensor after power-on. During preheating, it collects the exhaust temperature and flow rate of the exhaust pipe. Simultaneously, based on the exhaust temperature and flow rate, it calculates the exhaust heat and heat threshold of the exhaust pipe. Based on the exhaust heat and heat threshold, it detects whether condensation droplets will form in the exhaust pipe. If condensation droplets form, the wide-range oxygen sensor stops working and restarts. If no condensation droplets form, the wide-range oxygen sensor heats up rapidly until its temperature reaches the operating temperature, completing the start-up. Therefore, by adding condensation droplet detection during the heating process, this invention prevents the wide-range oxygen sensor from being damaged by thermal shock from condensation droplets. It also allows for precise control of the heating process, effectively ensuring the safety of the wide-range oxygen sensor while achieving rapid start-up.

[0034] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This diagram illustrates a flowchart of a wide-range oxygen sensor start-up control method provided by an embodiment of the present invention.

[0037] Figure 2 A schematic diagram of the control principle of the wide-range oxygen sensor provided in an embodiment of the present invention is shown;

[0038] Figure 3 This invention provides a schematic flowchart of another wide-range oxygen sensor start-up control method according to an embodiment of the present invention.

[0039] Figure 4 This diagram illustrates the structure of a wide-range oxygen sensor start-up control device according to an embodiment of the present invention.

[0040] Figure 5 This invention provides a schematic diagram of another wide-range oxygen sensor start-up control device according to an embodiment of the present invention.

[0041] Figure 6 A schematic diagram of the physical structure of an electronic device provided by an embodiment of the present invention is shown. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be noted that the terms "comprising" and "having," and any variations thereof, in the embodiments and drawings of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0044] In existing technologies, if there are condensation droplets in the pipeline, the ceramic on the surface of the wide-range oxygen sensor, which is directly heated to the high temperature required for operation, is likely to be damaged by the thermal shock of the condensation droplets.

[0045] To overcome the above-mentioned shortcomings, embodiments of the present invention provide a wide-range oxygen sensor start-up control method, such as... Figure 1 As shown, the method includes:

[0046] Step 101: Preheat the wide-range oxygen sensor after power-on, and collect the exhaust temperature and exhaust flow rate of the exhaust pipe during the preheating process.

[0047] The wide-range oxygen sensor includes an oxygen concentration detection circuit and a heating circuit.

[0048] The embodiments of this invention are mainly applicable to scenarios involving controlling the activation of a wide-range oxygen sensor. The executing entity of these embodiments is a device or equipment capable of controlling the activation of a wide-range oxygen sensor.

[0049] To prevent the wide-range oxygen sensor, which is heated to the required high operating temperature, from being damaged by thermal shock from condensation droplets, this embodiment of the invention adds condensation droplet detection during the heating start-up process of the wide-range oxygen sensor. The overall control logic of the wide-range oxygen sensor is as follows: Figure 2 As shown, after the wide-range oxygen sensor is powered on, it is preheated. During the preheating process, condensation droplet detection is performed. If the wide-range oxygen sensor fails the condensation droplet detection, it is controlled to restart. If the wide-range oxygen sensor passes the condensation droplet detection, it is controlled to heat up quickly. When the operating temperature is reached, a PID control mode is used to maintain the temperature and enter the normal operating stage. Condensation droplet detection is still performed during the operating stage. If the engine idle time is too long, resulting in low exhaust temperature and condensation droplets, the wide-range oxygen sensor is controlled to restart and reheat.

[0050] Specifically, when the engine is powered on or enabled, the wide-range oxygen sensor automatically powers on. Then, the heating circuit of the wide-range oxygen sensor is controlled to maintain low-pressure, low-temperature heating. During this low-temperature preheating process, condensation droplet detection is performed, specifically detecting whether condensation droplets will form in the exhaust pipe. Furthermore, to perform condensation droplet detection, this embodiment of the invention collects the exhaust temperature and exhaust flow rate in the exhaust pipe in real time. The exhaust temperature can be measured by an additionally installed temperature sensor, and the exhaust flow rate can be obtained from the engine's real-time parameters.

[0051] Step 102: Based on the exhaust temperature and the exhaust flow rate, calculate the exhaust heat and heat threshold of the exhaust pipe, respectively.

[0052] In this embodiment of the invention, before formally performing condensate droplet detection, it is necessary to determine whether the condensate droplet detection shutdown condition is not activated. If the condensate droplet detection shutdown condition is not activated, it is necessary to further determine whether the condensate droplet detection trigger condition is activated. If the condensate droplet detection trigger condition is activated, the condensate droplet detection can be formally performed based on the exhaust heat and heat threshold. Based on this, the method further includes: acquiring the engine speed; if the engine speed is higher than a preset speed threshold and the exhaust temperature is higher than a preset exhaust temperature threshold, it is determined that the condensate droplet detection shutdown condition is not activated; acquiring the engine power-on time and running time; if both the power-on time and the running time meet the corresponding time requirements, it is determined that the condensate droplet detection trigger condition is activated; and calculating the exhaust heat and heat threshold of the exhaust pipe based on the exhaust temperature and the exhaust flow rate.

[0053] The preset speed threshold, preset exhaust temperature threshold, power-on time requirement, and running time requirement can be set according to actual business needs, and the embodiments of the present invention do not impose specific limitations on them.

[0054] Specifically, if the engine speed is lower than or equal to a preset speed threshold, or the exhaust temperature is lower than or equal to a preset exhaust temperature threshold, the condensate droplet detection shutdown condition is activated, and condensate droplet detection is not required. If the engine speed is higher than the preset speed threshold and the exhaust temperature is higher than the preset exhaust temperature threshold, the condensate droplet detection shutdown condition is not activated. In this case, it is necessary to further check whether the engine power-on time and running time meet the corresponding time requirements. If the engine power-on time and running time reach the corresponding time thresholds, the condensate droplet detection trigger condition is activated, and condensate droplet detection can be formally performed based on exhaust temperature and exhaust flow. If the engine power-on time or running time does not reach the corresponding time thresholds, the condensate droplet detection trigger condition is not activated, and condensate droplet detection is not required.

[0055] Furthermore, if the condensate droplet detection shutdown condition is not activated, but the condensate droplet detection trigger condition is activated, the engine temperature and oil temperature can be acquired. Based on these temperatures, an average detection temperature is calculated. Then, based on this average detection temperature and the measured exhaust temperature, a heat threshold is calculated. Simultaneously, based on the measured exhaust temperature and exhaust flow rate, exhaust heat is calculated. This exhaust heat and heat threshold are used to determine whether condensate droplets will form in the exhaust pipe, potentially damaging the wide-range oxygen sensor. The specific calculation process for exhaust heat and the heat threshold is detailed in steps 202-204.

[0056] Step 103: Based on the exhaust heat and the heat threshold, detect whether condensation droplets will form in the exhaust pipe.

[0057] In this embodiment of the invention, if the exhaust heat is greater than the heat threshold, it means that the current heat has fully evaporated and vaporized the water in the pipe, and no condensate droplets will be generated in the exhaust pipe. That is, the condensate droplet detection is passed, and the heating function of the wide-range oxygen sensor can be fully activated at this time. Conversely, if the exhaust heat is less than or equal to the preset heat threshold, it means that the current heat has not evaporated and vaporized the water in the pipe, and condensate droplets will be generated in the exhaust pipe. That is, the condensate droplet detection is not passed.

[0058] Step 104: If condensation droplets form in the exhaust pipe, control the wide-range oxygen sensor to stop working and restart it.

[0059] In this embodiment of the invention, if condensation droplets are detected in the exhaust pipe during the low-temperature preheating process, the wide-range oxygen sensor needs to be restarted to prevent the ceramic on the surface of the wide-range oxygen sensor from being damaged by the thermal shock of the condensation droplets.

[0060] Step 105: If no condensate droplets form in the exhaust pipe, control the wide-range oxygen sensor to heat up rapidly until the temperature of the wide-range oxygen sensor reaches the operating temperature, and then complete the startup.

[0061] In this embodiment of the invention, if no condensate droplets are detected in the exhaust pipe during the low-temperature preheating process, the heating circuit of the wide-range oxygen sensor can be controlled to heat rapidly until the operating temperature is reached. As an optional implementation, the method for controlling this rapid heating process includes: controlling the heating circuit of the wide-range oxygen sensor to increase its voltage at the maximum rate within the operating voltage change range; if the wide-range oxygen sensor has already reached the operating temperature before reaching the maximum voltage, then controlling the wide-range oxygen sensor to directly enter the constant temperature holding stage; if the wide-range oxygen sensor has not yet reached the operating temperature before reaching the maximum voltage, then maintaining the maximum voltage until the temperature of the wide-range oxygen sensor reaches the operating temperature.

[0062] Furthermore, after the wide-range oxygen sensor is heated to its operating temperature, it will enter a normal operating mode. At this time, the temperature can be controlled in a closed-loop manner using PID regulation mode to achieve precise temperature control.

[0063] The present invention provides a wide-range oxygen sensor start-up control method, which, by adding condensate droplet detection during the heating process, can prevent the wide-range oxygen sensor from being damaged by the thermal shock of condensate droplets. At the same time, it can accurately control the heating process of the wide-range oxygen sensor, effectively ensuring the safety of the wide-range oxygen sensor while achieving rapid start-up.

[0064] Furthermore, as a refinement and extension of the above embodiments, this invention provides another wide-range oxygen sensor start-up control method, such as... Figure 3 As shown, the method includes:

[0065] Step 201: Preheat the wide-range oxygen sensor after power-on, and collect the exhaust temperature and exhaust flow rate of the exhaust pipe during the preheating process.

[0066] In this embodiment of the invention, for pipes with simple structures, the pipe wall temperature can be directly read and used to detect condensate droplets; for pipes with complex structures, it is still necessary to use the exhaust temperature and exhaust heat to detect condensate droplets in order to ensure the detection accuracy of condensate droplets.

[0067] Step 202: Obtain oil temperature, engine temperature, number of cold starts, and condensate temperature, and calculate the average detection temperature based on the engine temperature and the oil temperature.

[0068] In this embodiment of the invention, if the condensate droplet detection shutdown condition is not activated, but the condensate droplet detection trigger condition is activated, condensate droplet detection can be formally performed. During detection, it is necessary to obtain the oil temperature, engine temperature, number of cold starts, and condensate temperature from relevant engine parameters. Then, based on the engine temperature and oil temperature, the average detection temperature is calculated. The method for calculating the average detection temperature includes: obtaining a first temperature correction coefficient, and determining a second temperature correction coefficient based on the first temperature correction coefficient; multiplying the first temperature correction coefficient by the engine temperature to obtain a first multiplication result; multiplying the second temperature correction coefficient by the oil temperature to obtain a second multiplication result; and adding the first multiplication result and the second multiplication result to obtain the average detection temperature. The specific calculation formula for the average detection temperature is as follows:

[0069] T Dew =K EngTemp ·T Eng +(1-K EngTemp )·T Oil

[0070] Among them, T Dew To average the detected temperature, K EngTemp T is the first temperature correction factor. Eng Engine temperature, 1-K EngTemp T is the second temperature correction factor. Oil This refers to the oil temperature. The first temperature correction factor can be set according to actual business needs.

[0071] Step 203: Calculate the heat threshold based on the average detection temperature, the number of cold starts, and the exhaust temperature.

[0072] In this embodiment of the invention, when detecting condensate droplets, a heat threshold also needs to be calculated. The calculation process for this heat threshold includes: querying a preset basic heat threshold table based on the average detection temperature and the exhaust temperature to determine the corresponding basic heat threshold; obtaining a heat threshold correction coefficient and a cold start correction coefficient; and multiplying the basic heat threshold by the number of cold starts based on the heat threshold correction coefficient and the cold start correction coefficient to obtain the heat threshold. The specific calculation formula for the heat threshold is as follows:

[0073] H ThresPls =k Pls ·(1+K CldStrt )·C CldStrt ·H ThresBas

[0074] Among them, H ThresPls k is the caloric threshold. Pls C is the calorie threshold correction factor. CldStrt K represents the number of cold starts. CldStrt H is the cold start correction factor. ThresBas The basic heat threshold is set to 0. When the condensate droplet detection trigger condition is activated, the initial value of the basic heat threshold is updated by querying the preset basic heat threshold table based on the average detection temperature and exhaust temperature; otherwise, it remains unchanged.

[0075] Step 204: Calculate the exhaust heat based on the condensate temperature, the exhaust temperature, and the exhaust flow rate.

[0076] In this embodiment of the invention, when detecting condensate droplets, in addition to calculating the average detection temperature and heat threshold, it is also necessary to calculate the exhaust heat. The specific calculation process for this exhaust heat includes: subtracting the exhaust temperature from the condensate temperature to obtain the condensate temperature difference; determining the exhaust specific heat capacity corresponding to the exhaust temperature based on the exhaust specific heat capacity curve; and integrating the condensate temperature difference, the exhaust specific heat capacity, and the exhaust flow rate over time to obtain the exhaust heat. The specific formula for calculating the exhaust heat is as follows:

[0077] H EG =∫(T) Cat -T WC )·C EG ·M ExhMod dt

[0078] Among them, H EG For exhaust heat, T Cat T represents the exhaust temperature. WC C represents the condensate temperature. EG M is the specific heat capacity of the exhaust gas.ExhMod The exhaust flow rate is H. When the condensate detection shutdown condition is activated or the exhaust temperature is lower than the preset shutdown temperature threshold, the exhaust heat H is... EG Set to 0.

[0079] Step 205: Obtain the temperature of the oxidation catalyst. During engine cold start, if the exhaust heat is greater than the heat threshold, and the oxidation catalyst temperature is greater than the preset cold start temperature threshold for a preset duration, and the average detected temperature is greater than the preset detected temperature threshold, then it is determined that no condensate droplets will form in the exhaust pipe. During engine hot start, if the oxidation catalyst temperature is greater than the preset hot start temperature threshold for a preset duration, and the average detected temperature is greater than the preset detected temperature threshold, then it is determined that no condensate droplets will form in the exhaust pipe.

[0080] The preset detection temperature threshold, preset cold start temperature threshold, preset hot start temperature threshold, and preset duration can be set according to actual business needs.

[0081] In this embodiment of the invention, during engine cold start, if the exhaust heat is less than or equal to a preset heat threshold, or the average detected temperature is less than or equal to a preset detected temperature threshold, or the duration for which the oxidation catalyst temperature is greater than the preset cold start temperature threshold does not reach a preset duration, then it is determined that condensate droplets may form in the exhaust pipe; during engine hot start, if the duration for which the oxidation catalyst temperature is greater than the preset hot start temperature threshold does not reach a preset duration, or the average detected temperature is less than or equal to the preset detected temperature threshold, then it is determined that condensate droplets may form in the exhaust pipe.

[0082] Step 206: If condensation droplets form in the exhaust pipe, control the wide-range oxygen sensor to stop working and restart it.

[0083] In this embodiment of the invention, if condensation droplets are detected in the exhaust pipe during the low-temperature preheating process, the wide-range oxygen sensor needs to be restarted to prevent the ceramic on the surface of the wide-range oxygen sensor from being damaged by the thermal shock of the condensation droplets.

[0084] Step 207: If no condensate droplets form in the exhaust pipe, control the wide-range oxygen sensor to heat up rapidly until the temperature of the wide-range oxygen sensor reaches the operating temperature, and then complete the startup.

[0085] In this embodiment of the invention, after the wide-range oxygen sensor rapidly heats up and enters normal operating mode, condensation droplet detection can continue to ensure the safety of the wide-range oxygen sensor in normal operating mode. Based on this, the method further includes: after the wide-range oxygen sensor reaches its normal operating temperature, controlling the wide-range oxygen sensor to enter normal operating mode and continuing to detect condensation droplets; if the condensation droplet detection fails, controlling the wide-range oxygen sensor to stop working and restarting it.

[0086] Specifically, if condensation droplets are detected in the exhaust pipe during the normal operation of the wide-range oxygen sensor, the wide-range oxygen sensor will be stopped and restarted by heating.

[0087] Another method for controlling the start-up of a wide-range oxygen sensor provided in this embodiment of the invention can prevent the wide-range oxygen sensor from being damaged by the thermal shock of condensation droplets by adding condensation droplet detection during the heating process. At the same time, it can accurately control the heating process of the wide-range oxygen sensor, effectively ensuring the safety of the wide-range oxygen sensor while achieving rapid start-up.

[0088] Furthermore, as Figure 1 In a specific implementation, this invention provides a wide-range oxygen sensor start-up control device, such as... Figure 4 As shown, the device includes: a preheating unit 31, a calculation unit 32, a detection unit 33, and a control unit 34.

[0089] The preheating unit 31 can be used to preheat the wide-range oxygen sensor after it is powered on, and to collect the exhaust temperature and exhaust flow rate of the exhaust pipe during the preheating process.

[0090] The calculation unit 32 can be used to calculate the exhaust heat and heat threshold of the exhaust pipe based on the exhaust temperature and the exhaust flow rate, respectively.

[0091] The detection unit 33 can be used to detect whether condensate droplets will form in the exhaust pipe based on the exhaust heat and the heat threshold.

[0092] The control unit 34 can be used to control the wide-range oxygen sensor to stop working and restart if condensation droplets are formed in the exhaust pipe.

[0093] The control unit 34 can also be used to control the wide-range oxygen sensor to heat up rapidly if no condensate droplets are formed in the exhaust pipe, until the temperature of the wide-range oxygen sensor reaches the operating temperature, and then start up.

[0094] In specific application scenarios, the computing unit 32, such as Figure 5 As shown, it includes: an acquisition module 321 and a calculation module 322.

[0095] The acquisition module 321 can be used to acquire oil temperature, engine temperature, number of cold starts, and condensate temperature.

[0096] The calculation module 322 can be used to calculate the average detection temperature based on the engine temperature and the oil temperature.

[0097] The calculation module 322 can also be used to calculate the heat threshold based on the average detection temperature, the number of cold starts, and the exhaust temperature.

[0098] The calculation module 322 can also be used to calculate the exhaust heat based on the condensate temperature, the exhaust temperature and the exhaust flow rate.

[0099] Furthermore, the calculation module 322 can be specifically used to obtain a first temperature correction coefficient, and determine a second temperature correction coefficient based on the first temperature correction coefficient; multiply the first temperature correction coefficient by the engine temperature to obtain a first multiplication result; multiply the second temperature correction coefficient by the oil temperature to obtain a second multiplication result; and add the first multiplication result and the second multiplication result to obtain the average detection temperature.

[0100] Furthermore, the calculation module 322 can also be specifically used to query a preset basic heat threshold table based on the average detection temperature and the exhaust temperature to determine the corresponding basic heat threshold; obtain the heat threshold correction coefficient and the cold start correction coefficient; and multiply the basic heat threshold by the number of cold starts based on the heat threshold correction coefficient and the cold start correction coefficient to obtain the heat threshold.

[0101] Furthermore, the calculation module 322 can also be specifically used to subtract the exhaust temperature from the condensate temperature to obtain the condensate temperature difference; determine the exhaust specific heat capacity corresponding to the exhaust temperature according to the exhaust specific heat capacity curve; and multiply the condensate temperature difference, the exhaust specific heat capacity, and the exhaust flow rate and integrate over time to obtain the exhaust heat.

[0102] In specific application scenarios, the detection unit 33 can be used to obtain the temperature of the oxidation catalyst. During engine cold start, if the exhaust heat is greater than the heat threshold and the oxidation catalyst temperature is greater than the preset cold start temperature threshold for a preset duration, and the average detection temperature is greater than the preset detection temperature threshold, then it is determined that no condensate droplets will form in the exhaust pipe. During engine hot start, if the oxidation catalyst temperature is greater than the preset hot start temperature threshold for a preset duration and the average detection temperature is greater than the preset detection temperature threshold, then it is determined that no condensate droplets will form in the exhaust pipe.

[0103] In specific application scenarios, the device further includes: a determining unit 35.

[0104] The determining unit 35 can be used to obtain the engine speed; if the engine speed is higher than a preset speed threshold and the exhaust temperature is higher than a preset exhaust temperature threshold, it is determined that the condensate droplet detection shutdown condition is not activated, and the engine power-on time and running time are obtained; if both the power-on time and the running time meet the corresponding time requirements, it is determined that the condensate droplet detection trigger condition is activated, and the exhaust heat and heat threshold of the exhaust pipe are calculated based on the exhaust temperature and the exhaust flow rate.

[0105] In specific application scenarios, the control unit 34 can be used to control the heating circuit of the wide-range oxygen sensor to perform voltage boosting heating at the maximum rate within the operating voltage change rate range; if the wide-range oxygen sensor has reached the operating temperature before reaching the maximum voltage, the wide-range oxygen sensor is controlled to directly enter the constant temperature holding stage; if the wide-range oxygen sensor has not yet reached the operating temperature before reaching the maximum voltage, the maximum voltage is maintained until the temperature of the wide-range oxygen sensor reaches the operating temperature.

[0106] Furthermore, the control unit 34 can also be used to control the wide-range oxygen sensor to enter a normal working mode after the wide-range oxygen sensor reaches its normal working temperature, and continue to detect condensation droplets on the wide-range oxygen sensor; when the condensation droplet detection fails, the control unit can control the wide-range oxygen sensor to stop working and restart.

[0107] It should be noted that other corresponding descriptions of the functional modules involved in the wide-range oxygen sensor start-up control device provided in this embodiment of the invention can be found in [reference]. Figure 1 The corresponding description of the method shown will not be repeated here.

[0108] Based on the above, Figure 1Accordingly, this embodiment of the invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, performs the following steps: preheating the wide-range oxygen sensor after power-on, and collecting the exhaust temperature and exhaust flow rate of the exhaust pipe during the preheating process; calculating the exhaust heat and heat threshold of the exhaust pipe based on the exhaust temperature and the exhaust flow rate; detecting whether condensate droplets will form in the exhaust pipe according to the exhaust heat and the heat threshold; if condensate droplets will form in the exhaust pipe, controlling the wide-range oxygen sensor to stop working and restarting; if no condensate droplets will form in the exhaust pipe, controlling the wide-range oxygen sensor to heat up rapidly until the temperature of the wide-range oxygen sensor reaches the operating temperature, thus completing the startup.

[0109] Based on the above, Figure 1 The method shown and as Figure 4 The embodiment of the device shown in the invention also provides a physical structural diagram of an electronic device, such as... Figure 6 As shown, the electronic device includes: a processor 41, a memory 42, and a computer program stored in the memory 42 and executable on the processor. Both the memory 42 and the processor 41 are mounted on a bus 43. When the processor 41 executes the program, it performs the following steps: preheating the wide-range oxygen sensor after power-on, and collecting the exhaust temperature and flow rate of the exhaust pipe during the preheating process; calculating the exhaust heat and heat threshold of the exhaust pipe based on the exhaust temperature and the exhaust flow rate; detecting whether condensate droplets will form in the exhaust pipe based on the exhaust heat and the heat threshold; if condensate droplets form in the exhaust pipe, controlling the wide-range oxygen sensor to stop working and restarting; if no condensate droplets form in the exhaust pipe, controlling the wide-range oxygen sensor to heat rapidly until the temperature of the wide-range oxygen sensor reaches the operating temperature, thus completing the startup.

[0110] This invention, by adding condensation droplet detection during the heating process, can prevent the wide-range oxygen sensor from being damaged by the thermal shock of condensation droplets. At the same time, it can precisely control the heating process of the wide-range oxygen sensor, effectively ensuring the safety of the wide-range oxygen sensor while enabling rapid start-up.

[0111] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing the present invention.

[0112] Those skilled in the art will understand that the modules in the apparatus of the embodiments can be distributed in the apparatus of the embodiments as described in the embodiments, or they can be located in one or more devices different from this embodiment with corresponding changes. The modules of the above embodiments can be combined into one module, or they can be further divided into multiple sub-modules.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the start-up of a wide-range oxygen sensor, characterized in that, include: The wide-range oxygen sensor is preheated after being powered on. During the preheating process, the exhaust temperature and exhaust flow rate of the exhaust pipe are collected, and the engine speed is obtained. If the engine speed is higher than the preset speed threshold and the exhaust temperature is higher than the preset exhaust temperature threshold, and the generator power-on time and running time both meet the corresponding time requirements, then the condensate droplet detection trigger condition is activated. When the condensate droplet detection trigger condition is activated, the heat threshold of the exhaust pipe is calculated based on the exhaust temperature and exhaust flow rate, combined with engine temperature, oil temperature, and number of cold starts. Simultaneously, the exhaust heat of the exhaust pipe is calculated based on the condensate temperature. The specific formula for calculating the exhaust heat is as follows: H EG =∫(T Cat -T WC )·C EG ·M ExhMod dt Among them, H EG For exhaust heat, T Cat T represents the exhaust temperature. WC C represents the condensate temperature. EG M is the specific heat capacity of the exhaust gas. ExhMod The exhaust flow rate is H. When the condensate detection shutdown condition is activated or the exhaust temperature is lower than the preset shutdown temperature threshold, the exhaust heat H is... EG Set to 0; Based on the exhaust heat and the heat threshold, detect whether condensate droplets will form in the exhaust pipe; If condensation droplets form in the exhaust pipe, the wide-range oxygen sensor will stop working and restart. If no condensate droplets form in the exhaust pipe, the wide-range oxygen sensor is controlled to heat up rapidly until the temperature of the wide-range oxygen sensor reaches the operating temperature, and then the startup is completed. The method of controlling the rapid heating of the wide-range oxygen sensor includes: The heating circuit of the wide-range oxygen sensor is controlled to increase the pressure and heat at the maximum rate within the operating voltage change rate range; If the wide-range oxygen sensor has reached the operating temperature before reaching the maximum voltage, then the wide-range oxygen sensor is controlled to directly enter the constant temperature holding stage. If the wide-range oxygen sensor has not reached the operating temperature before reaching the maximum voltage, the maximum voltage is maintained until the temperature of the wide-range oxygen sensor reaches the operating temperature. The step of calculating the exhaust heat and heat threshold of the exhaust pipe based on the exhaust temperature and the exhaust flow rate includes: Get oil temperature, engine temperature, number of cold starts, and condensate temperature; Calculate the average detected temperature based on the engine temperature and the oil temperature; The heat threshold is calculated based on the average detection temperature, the number of cold starts, and the exhaust temperature. The heat of the exhaust gas is calculated based on the condensate temperature, the exhaust gas temperature, and the exhaust gas flow rate. The step of calculating the average detection temperature based on the engine temperature and the oil temperature includes: Obtain a first temperature correction factor, and determine a second temperature correction factor based on the first temperature correction factor; Multiply the first temperature correction coefficient by the engine temperature to obtain the first multiplication result; Multiply the second temperature correction factor by the oil temperature to obtain the second multiplication result; Add the first multiplication result and the second multiplication result to obtain the average detection temperature; The step of calculating the heat threshold based on the average detection temperature, the number of cold starts, and the exhaust temperature includes: The corresponding basic heat threshold is determined by querying the preset basic heat threshold table based on the average detected temperature and the exhaust temperature. Obtain the heat threshold correction coefficient and the cold start correction coefficient. Based on the heat threshold correction coefficient and the cold start correction coefficient, multiply the base heat threshold by the number of cold starts to obtain the heat threshold. The step of calculating the exhaust heat based on the condensate temperature, the exhaust temperature, and the exhaust flow rate includes: Subtracting the exhaust temperature from the condensate temperature yields the condensate temperature difference; The exhaust specific heat capacity corresponding to the exhaust temperature is determined based on the exhaust specific heat capacity curve. The exhaust heat is obtained by multiplying the condensate temperature difference, the exhaust specific heat capacity, and the exhaust flow rate and integrating over time. The step of detecting whether condensate droplets will form in the exhaust pipe based on the exhaust heat and the heat threshold includes: Obtain the temperature of the oxidation catalyst; During engine cold start, if the exhaust heat is greater than the heat threshold, and the oxidation catalyst temperature is greater than the preset cold start temperature threshold for a preset duration, and the average detection temperature is greater than the preset detection temperature threshold, then it is determined that no condensate droplets will form in the exhaust pipe. During engine hot start, if the oxidation catalyst temperature is higher than the preset hot start temperature threshold for a preset duration, and the average detected temperature is higher than the preset detected temperature threshold, then it is determined that no condensate droplets will form in the exhaust pipe.

2. The method according to claim 1, characterized in that, Before calculating the exhaust heat and heat threshold of the exhaust pipe based on the exhaust temperature and the exhaust flow rate, the method further includes: Get engine speed; If the engine speed is higher than a preset speed threshold and the exhaust temperature is higher than a preset exhaust temperature threshold, it is determined that the condensate droplet detection shutdown condition is not activated, and the engine power-on time and running time are obtained. If both the power-on time and the running time meet the corresponding time requirements, the condensate droplet detection trigger condition is activated. Based on the exhaust temperature and the exhaust flow rate, the exhaust heat and heat threshold of the exhaust pipe are calculated respectively.

3. The method according to claim 1, characterized in that, The method further includes: After the wide-range oxygen sensor reaches its normal operating temperature, the wide-range oxygen sensor is controlled to enter the normal operating mode, and the detection of condensation droplets continues. If the condensate droplet detection fails, the wide-range oxygen sensor is controlled to stop working and restart.

4. A wide-range oxygen sensor start-up control device, characterized in that, include: The preheating unit is used to preheat the wide-range oxygen sensor after it is powered on. During the preheating process, the exhaust temperature and exhaust flow of the exhaust pipe are collected, and the engine speed is obtained. The activation determination unit is used to determine that the condensate droplet detection trigger condition is activated if the engine speed is higher than a preset speed threshold, the exhaust temperature is higher than a preset exhaust temperature threshold, and the generator power-on time and running time both meet the corresponding time requirements. The calculation unit is used to calculate the heat threshold of the exhaust pipe based on the exhaust temperature and exhaust flow rate, combined with engine temperature, oil temperature, and number of cold starts, when the condensate droplet detection trigger condition is activated. Simultaneously, it calculates the exhaust heat of the exhaust pipe based on the condensate temperature. The specific calculation formula for the exhaust heat is as follows: H EG =∫(T Cat -T WC )·C EG ·M ExhMod dt Among them, H EG For exhaust heat, T Cat T represents the exhaust temperature. WC C represents the condensate temperature. EG M is the specific heat capacity of the exhaust gas. ExhMod The exhaust flow rate is H. When the condensate detection shutdown condition is activated or the exhaust temperature is lower than the preset shutdown temperature threshold, the exhaust heat H is... EG Set to 0; The detection unit is used to detect whether condensate droplets will form in the exhaust pipe based on the exhaust heat and the heat threshold. The control unit is configured to stop the wide-range oxygen sensor from operating and restart it if condensation droplets form in the exhaust pipe. The control unit is further configured to, if no condensation droplets form in the exhaust pipe, control the wide-range oxygen sensor to heat rapidly until the temperature of the wide-range oxygen sensor reaches the operating temperature, thus completing the startup process; wherein, the control unit controls the wide-range oxygen sensor to heat rapidly by: controlling the heating circuit of the wide-range oxygen sensor to increase the voltage at the maximum rate within the operating voltage change rate range; if the wide-range oxygen sensor has reached the operating temperature before reaching the maximum voltage, then controlling the wide-range oxygen sensor to directly enter the constant temperature holding stage; if the wide-range oxygen sensor has not yet reached the operating temperature before reaching the maximum voltage, then maintaining the maximum voltage until the temperature of the wide-range oxygen sensor reaches the operating temperature; The calculation unit calculates the exhaust heat and heat threshold of the exhaust pipe based on the exhaust temperature and the exhaust flow rate, specifically for: acquiring oil temperature, engine temperature, number of cold starts, and condensate temperature; calculating the average detection temperature based on the engine temperature and the oil temperature; calculating the heat threshold based on the average detection temperature, the number of cold starts, and the exhaust temperature; and calculating the exhaust heat based on the condensate temperature, the exhaust temperature, and the exhaust flow rate. The calculation unit calculates the average detection temperature based on the engine temperature and the oil temperature, specifically by: obtaining a first temperature correction coefficient and determining a second temperature correction coefficient based on the first temperature correction coefficient; multiplying the first temperature correction coefficient by the engine temperature to obtain a first multiplication result; multiplying the second temperature correction coefficient by the oil temperature to obtain a second multiplication result; and adding the first multiplication result and the second multiplication result to obtain the average detection temperature. The calculation unit calculates the heat threshold based on the average detected temperature, the number of cold starts, and the exhaust temperature. Specifically, it is used to: query a preset basic heat threshold table based on the average detected temperature and the exhaust temperature to determine the corresponding basic heat threshold; obtain a heat threshold correction coefficient and a cold start correction coefficient; and multiply the basic heat threshold by the number of cold starts based on the heat threshold correction coefficient and the cold start correction coefficient to obtain the heat threshold. The calculation unit calculates the exhaust heat based on the condensate temperature, the exhaust temperature, and the exhaust flow rate. Specifically, it is used to: subtract the condensate temperature from the exhaust temperature to obtain the condensate temperature difference; determine the exhaust specific heat capacity corresponding to the exhaust temperature based on the exhaust specific heat capacity curve; and multiply the condensate temperature difference, the exhaust specific heat capacity, and the exhaust flow rate and integrate over time to obtain the exhaust heat. The detection unit detects whether condensation droplets will form in the exhaust pipe based on the exhaust heat and the heat threshold. Specifically, it is used to: obtain the oxidation catalyst temperature; during engine cold start, if the exhaust heat is greater than the heat threshold, and the oxidation catalyst temperature is greater than a preset cold start temperature threshold for a preset duration, and the average detected temperature is greater than a preset detected temperature threshold, then it is determined that condensation droplets will not form in the exhaust pipe; during engine hot start, if the oxidation catalyst temperature is greater than a preset hot start temperature threshold for a preset duration, and the average detected temperature is greater than a preset detected temperature threshold, then it is determined that condensation droplets will not form in the exhaust pipe.

5. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 3.

6. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 3.

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