An oxygen sensor calibration method and related device

Abstract

The present application discloses an oxygen sensor calibration method and related devices, which relate to the field of gas engine control technology and are applied to an engine controller in a gas vehicle. The gas vehicle also includes a gas engine, wherein a single-side oxygen sensor in the gas engine is located in its housing, and the surface of the housing has a plurality of through holes. A branch pipeline is provided on the single-side intercooler intake pipe between the compressor and the intercooler in the gas engine, and the outlet of the branch pipeline faces the oxygen sensor on the opposite side, and a bypass valve is provided on the branch pipeline. Determine the target oxygen sensor to be calibrated; when the engine on the side where the target oxygen sensor is located is in a stable working condition, read and record the first value of the target oxygen sensor, and control the bypass valve on the opposite side to open, and spray compressed gas to the target oxygen sensor through the intercooler intake pipe and the branch pipeline on the opposite side to form a surrounding atmosphere in the housing where the target oxygen sensor is located; perform atmospheric calibration on the target oxygen sensor. This can achieve efficient calibration of the oxygen sensor.

Description

Technical Field

[0001] The present application relates to the field of gas engine control technology, and in particular to an oxygen sensor calibration method and related devices. Background Art

[0002] At present, gas engines often use oxygen sensors to detect the oxygen content in the engine exhaust to evaluate the air-fuel ratio. However, after long-term use, the oxygen sensor will have measurement deviations, which will affect the judgment of the air-fuel ratio, causing the engine mixture to be too rich or too lean, affecting engine performance and reliability. This requires the calibration of the oxygen sensor.

[0003] At present, the commonly used calibration method is to stop the engine, and the maintenance technician manually removes the oxygen sensors on both sides and places them in the atmosphere for atmospheric calibration. After eliminating the deviation, the oxygen sensors on both sides are manually reinstalled. The whole calibration process is time-consuming and labor-intensive. Summary of the invention

[0004] In view of the above problems, the present application provides an oxygen sensor calibration method and related devices to achieve the purpose of efficient calibration of oxygen sensors. The specific scheme is as follows:

[0005] In a first aspect, the present application provides an oxygen sensor calibration method, which is applied to an engine controller in a gas vehicle, wherein the gas vehicle further comprises a gas engine, wherein a single oxygen sensor in the gas engine is located in a housing thereof, wherein a surface of the housing has a plurality of through holes, wherein a branch pipeline is provided on an air inlet pipe of an intercooler located between a compressor and an intercooler on a single side of the gas engine, wherein an air outlet of the branch pipeline faces the oxygen sensor on the opposite side, and a bypass valve is provided on the branch pipeline, wherein the oxygen sensor calibration method comprises:

[0006] Determine the target oxygen sensor to be calibrated;

[0007] When the engine on the side where the target oxygen sensor is located is in a stable operating condition, a first value of the target oxygen sensor is read and recorded, and the bypass valve on the opposite side is controlled to open, and compressed gas is sprayed toward the target oxygen sensor through the intercooler intake pipe on the opposite side and the branch pipeline to form a surrounding atmosphere in the housing where the target oxygen sensor is located;

[0008] The target oxygen sensor is calibrated in atmosphere.

[0009] In a possible implementation, the through holes are evenly distributed on the surface of the housing.

[0010] In a possible implementation, the housing is a stainless steel housing.

[0011] In a possible implementation, determining a target oxygen sensor to be calibrated includes:

[0012] If the specified detection cycle is currently reached, the oxygen sensor on each side of the gas engine is used as the target oxygen sensor; and / or

[0013] The second value of the oxygen sensor on each side of the gas engine is read, and the oxygen sensor whose second value is in an abnormal state is used as the target oxygen sensor.

[0014] In a possible implementation, the controlling the bypass valve on the opposite side to open includes:

[0015] Controlling the opening of the bypass valve from fully closed to a specified opening value, and maintaining the specified opening value for a specified time;

[0016] The bypass valve is controlled from the specified opening value to fully open according to the specified opening rate.

[0017] In a possible implementation, the oxygen sensor calibration method further includes:

[0018] After the atmospheric calibration is completed, reading a third value of the target oxygen sensor;

[0019] If the third value is in a normal state, determining that the target oxygen sensor has completed calibration;

[0020] If the third value is in an abnormal state, it is determined that the target oxygen sensor is malfunctioning.

[0021] The second aspect of the present application provides an oxygen sensor calibration device, which is applied to an engine controller in a gas vehicle, wherein the gas vehicle further comprises a gas engine, wherein a single oxygen sensor in the gas engine is located in a housing thereof, wherein a surface of the housing has a plurality of through holes, wherein a branch pipeline is provided on a single intercooler intake pipe located between a compressor and an intercooler in the gas engine, wherein an outlet of the branch pipeline faces the oxygen sensor on the opposite side, and a bypass valve is provided on the branch pipeline, wherein the oxygen sensor calibration device comprises:

[0022] A target determination module, used for determining a target oxygen sensor to be calibrated;

[0023] The atmospheric calibration module is used to read and record the first value of the target oxygen sensor when the engine on the side where the target oxygen sensor is located is in a stable operating condition, and control the bypass valve on the opposite side to open, and spray compressed gas to the target oxygen sensor through the intercooler intake pipe on the opposite side and the branch pipeline to form a surrounding atmosphere layer in the housing where the target oxygen sensor is located; and perform atmospheric calibration on the target oxygen sensor.

[0024] A third aspect of the present application provides a computer program product, comprising computer-readable instructions. When the computer-readable instructions are executed on an engine controller, the engine controller implements the oxygen sensor calibration method of the first aspect or any implementation of the first aspect.

[0025] A fourth aspect of the present application provides an engine controller, comprising at least one processor and a memory connected to the processor, wherein:

[0026] The memory is used to store computer programs;

[0027] The processor is used to execute the computer program so that the engine controller can implement the oxygen sensor calibration method of the first aspect or any implementation of the first aspect.

[0028] A fifth aspect of the present application provides a computer storage medium, which carries one or more computer programs. When the one or more computer programs are executed by an engine controller, the engine controller can implement the oxygen sensor calibration method of the first aspect or any implementation method of the first aspect.

[0029] By means of the above technical scheme, the present application provides an oxygen sensor calibration method and related device, which are applied to the engine controller in a gas vehicle. The gas vehicle also includes a gas engine. The oxygen sensor on one side of the gas engine is located in its shell, and the surface of the shell has multiple through holes. A branch pipeline is arranged on the air intake pipe of the intercooler on one side of the gas engine between the compressor and the intercooler, and the outlet of the branch pipeline faces the oxygen sensor on the opposite side. A bypass valve is arranged on the branch pipeline. Determine the target oxygen sensor to be calibrated; when the engine on the side where the target oxygen sensor is located is in a stable working condition, read and record the first value of the target oxygen sensor, and control the bypass valve on the opposite side to open, and spray compressed gas to the target oxygen sensor through the air intake pipe of the intercooler on the opposite side and the branch pipeline to form a surrounding atmosphere in the shell where the target oxygen sensor is located; perform atmospheric calibration on the target oxygen sensor.

[0030] That is to say, for one side of the gas engine, a branch pipeline with a bypass valve is set on the air intake pipe of the intercooler on that side, and at the same time, the oxygen sensor on that side is deployed in a shell with multiple through holes. When the engine is running stably, the bypass valve on the opposite side can be opened, and the compressed gas in the air intake pipe of the intercooler on the opposite side can be sprayed from the branch pipeline to the oxygen sensor on that side, and a surrounding atmosphere is formed around the oxygen sensor on that side through the shell, so that atmospheric calibration can be performed under the premise of normal operation of the engine. This application can achieve efficient calibration of oxygen sensors and improve engine performance and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] Figure 1 A schematic diagram of the structure of a gas engine provided in an embodiment of the present application;

[0033] Figure 2 A method flow chart of an oxygen sensor calibration method provided in an embodiment of the present application;

[0034] Figure 3 A partial method flow chart of an oxygen sensor calibration method provided in an embodiment of the present application;

[0035] Figure 4 Another method flow chart of an oxygen sensor calibration method provided in an embodiment of the present application;

[0036] Figure 5 A schematic diagram of the structure of an oxygen sensor calibration device provided in an embodiment of the present application;

[0037] Figure 6 A schematic diagram of the structure of an engine controller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following describes the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. The terms used in the implementation method section of the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application.

[0039] The embodiments of the present application are described below in conjunction with the accompanying drawings. Those skilled in the art will appreciate that, with the development of technology and the emergence of new scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0040] The terms "first", "second" etc. in the specification of the application and the above-mentioned drawings are used to distinguish similar objects, and need not be used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable in appropriate circumstances, and this is only to describe the distinction mode adopted by the objects of the same attributes when describing in the embodiments of the application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0041] To facilitate understanding of this application, the following first describes the relevant concepts involved in this application:

[0042] 1) Oxygen sensor: An oxygen sensor is a sensor used to detect the oxygen content in the engine exhaust. It measures the oxygen concentration in the exhaust gas and feeds back the signal to the engine control unit (ECU) to help adjust the fuel injection amount and keep the engine at the optimal air-fuel ratio, thereby achieving better combustion efficiency, reducing exhaust emissions, and improving engine performance.

[0043] 2) Atmospheric calibration: refers to the process of exposing the oxygen sensor to the atmosphere for calibration before use or after replacement. The purpose is to ensure that the oxygen sensor can accurately detect the oxygen content in the exhaust gas and convert it into an electrical signal and send it to the ECU so that the ECU can accurately control the fuel injection amount of the engine, thereby improving fuel economy and reducing exhaust emissions. A common method is to remove the oxygen sensor from the exhaust tail pipe, then expose it to the atmosphere and calibrate it using specific tools or equipment.

[0044] In order to solve the problem that the commonly used calibration methods are time-consuming and labor-intensive, ensure the efficient calibration of oxygen sensors, and improve the performance and reliability of engines, an embodiment of the present application provides an oxygen sensor calibration method. The following is a detailed introduction to an oxygen sensor calibration method of an embodiment of the present application in conjunction with the accompanying drawings.

[0045] An oxygen sensor calibration method provided in an embodiment of the present application is applied to an engine controller in a gas vehicle, and the gas vehicle also includes a gas engine. Figure 1 , Figure 1 This is a schematic diagram of the structure of the gas engine provided in the embodiment of the present application. Figure 1 As shown, the gas engine in the embodiment of the present application includes an A-side branch, a B-side branch and an intercooler, wherein the A-side branch includes a mixer A-1, a compressor A-2 ( Figure 1 The symbol C of the A-side branch is shown), engine A-3 (using a 6-cylinder engine with cylinders A1 to A6 as an example), turbine A-4 ( Figure 1 The symbol T of the A-side branch indicates that the oxygen sensor A-5, similarly, the B-side branch includes the mixer B-1, the compressor B-2 ( Figure 1 The symbol C of the branch on the B side indicates the engine B-3 (using the 6-cylinder engine with cylinders B1 to B6 as an example), turbine B-4 ( Figure 1 The symbol T of the B-side branch is represented by the oxygen sensor B-5.

[0046] It should be noted that the oxygen sensor A-5 and the oxygen sensor B-5 can be front oxygen sensors (i.e., oxygen sensors located before post-processing) or rear oxygen sensors (i.e., oxygen sensors located after post-processing), which is not limited in the embodiments of the present application.

[0047] Taking the A-side branch as an example to illustrate the working principle of the gas engine, the atmosphere and the gas are evenly mixed in the mixer A-1 and then enter the compressor A-2. The mixed gas is compressed in the compressor A-2 to form compressed gas, which is then passed through the intercooler intake pipe ( Figure 1 The solid line a-1 in the middle indicates that the compressed gas enters the intercooler, and after being cooled by the intercooler, it passes through the intake manifold ( Figure 1 The solid line a-2 indicates that the exhaust gas enters the cylinder of the engine A-3 and burns. The high-temperature exhaust gas after combustion passes through the exhaust manifold ( Figure 1 The dotted line a-3 indicates that the turbine A-4 is then exhausted through the exhaust tail pipe ( Figure 1 The high-temperature exhaust gas (indicated by the dotted line a-4) enters the oxygen sensor A-5. If the oxygen sensor A-5 is a front oxygen sensor, the high-temperature exhaust gas enters the post-processing after passing through the oxygen sensor A-5, and is then discharged into the atmosphere through the post-processing; if the oxygen sensor A-5 is a rear oxygen sensor, the high-temperature exhaust gas passes through the oxygen sensor A-5 and is then discharged into the atmosphere.

[0048] The same is true for the B-side branch. The atmosphere and fuel gas are evenly mixed in the mixer B-1 and then enter the compressor B-2. The mixed gas is compressed in the compressor B-2 to form compressed gas, which is then passed through the intercooler intake pipe ( Figure 1 The solid line b-1 indicates that the compressed gas enters the intercooler, and after being cooled by the intercooler, it passes through the intake manifold ( Figure 1 The solid line b-2 indicates that the exhaust gas enters the cylinder of the engine B-3 and burns. The high-temperature exhaust gas after combustion passes through the exhaust manifold ( Figure 1 The dotted line b-3 indicates that the turbine enters the turbine B-4 and then passes through the exhaust tail pipe ( Figure 1 The oxygen gas (indicated by the dashed line b-4) enters the oxygen sensor B-5.

[0049] Continuing with the example of the A-side branch, a housing A-6 is provided outside the oxygen sensor A-5, and the surface of the housing A-6 has a plurality of through holes. In addition, since the pressure of the mixed gas after being compressed by the compressor A-2 is high, it is easy to form a jet flow, so a branch pipeline with a bypass valve A-7 can be provided on the intercooler intake pipe a-1 between the compressor A-2 and the intercooler, one end of the branch pipeline is connected to the intercooler intake pipe a-1 as an air inlet, and the other end is used as an air outlet to face the oxygen sensor B-5 on the opposite side, so that the compressed gas of the A-side branch can be enveloped around the oxygen sensor B-5 to form a surrounding atmosphere, preparing for the subsequent atmospheric calibration of the oxygen sensor B-5. Of course, similarly, a branch pipe with a bypass valve B-7 is also provided on the intercooler intake pipe b-1 between the compressor B-2 and the intercooler. One end of the branch pipe is connected to the intercooler intake pipe b-1 as an air inlet, and the other end is an air outlet facing the oxygen sensor A-5 on the opposite side. In this way, the compressed gas from the B-side branch can cover the oxygen sensor A-5 to form a surrounding atmosphere, preparing for the subsequent atmospheric calibration of the oxygen sensor A-5.

[0050] Continuing to use the A-side branch as an example, in actual application, after the bypass valve B-7 of the B-side branch is opened, the compressed gas can be sprayed around the oxygen sensor A-5 after the turbine A-4 through the branch pipeline of the B-side branch, so that the compressed air enters the housing of the oxygen sensor A-5, forming a positive pressure surrounding the oxygen sensor A-5, thereby forming a surrounding atmosphere around the oxygen sensor A-5, and the surrounding atmosphere completely surrounds the probe of the oxygen sensor A-5, making the oxygen sensor A-5 like being placed in the atmosphere. Of course, during normal operation, the bypass valve B-7 of the B-side branch is closed, and the high-temperature exhaust gas of the A-side branch contacts the oxygen sensor A-5 through the through hole on the housing A-6, which does not affect the normal detection of the oxygen sensor A-5.

[0051] In a possible implementation, the through holes are evenly distributed on the surface of the housing. Continuing with the example of the A-side branch, in order to allow the compressed air of the B-side branch to evenly enter the housing of the oxygen sensor A-5 and form a uniform positive pressure surrounding the oxygen sensor A-5, through holes can be evenly arranged on the surface of the housing A-6. In addition, in order to ensure the practicality of the housing, preferably, the housing is a stainless steel housing.

[0052] See also Figure 2 , Figure 2 A method flow chart of an oxygen sensor calibration method provided in an embodiment of the present application. Figure 2 As shown, an oxygen sensor calibration method provided in an embodiment of the present application is applied to an engine controller and may include steps S10 to S30, and these steps are described in detail below.

[0053] S10, determining a target oxygen sensor to be calibrated.

[0054] In the embodiment of the present application, the target oxygen sensor is the oxygen sensor to be calibrated, which may be the oxygen sensor A-5 or the oxygen sensor B-5, which is not limited in the embodiment of the present application.

[0055] S20, when the engine on the side where the target oxygen sensor is located is in a stable operating condition, read and record the first value of the target oxygen sensor, control the bypass valve on the opposite side to open, and inject compressed gas to the target oxygen sensor through the intercooler intake pipe and branch pipe on the opposite side to form a surrounding atmosphere in the housing where the target oxygen sensor is located.

[0056] In the embodiment of the present application, before the target oxygen sensor is calibrated with the atmosphere, it is necessary to ensure that the engine on the side where it is located is in a stable working condition. Specifically, it can be determined based on the rate of change of the engine speed and the rate of change of the load (such as the throttle opening). If the rate of change of the engine speed and the rate of change of the load are both less than the corresponding rate of change threshold (such as 5%) within the specified time, it can be determined that the engine is in a stable working condition. Take the engine speed as an example, assuming that the specified time is 5 minutes, and determine whether the condition (maximum speed - minimum speed) / average speed < 5% is met within this time.

[0057] For ease of understanding, continue to use the A-side branch as an example. Assuming that the target oxygen sensor is determined to be oxygen sensor A-5, determine whether the speed change rate and load change rate of engine A-3 of the A-side branch are both less than the corresponding change rate thresholds. If both are less than, it is determined that engine A-3 is in a stable operating condition, and then further read and record the current value output by oxygen sensor A-5 (i.e., the first value) to freeze the first value, that is, in the subsequent working process, continue to use the first value as the input of the subsequent engine closed-loop control to ensure that engine A-3 can still work normally before the atmospheric calibration is completed.

[0058] Furthermore, the bypass valve B-7 of the B-side branch is controlled to open, and the compressed gas in the intercooler intake pipe b-1 is sprayed to the oxygen sensor A-5 through the branch pipeline of the B-side branch, so as to be sprayed around the oxygen sensor A-5 after the turbine A-4, so that the compressed air enters the outer casing of the oxygen sensor A-5, forming a positive pressure surrounding the oxygen sensor A-5, thereby forming a surrounding atmosphere around the oxygen sensor A-5, and the surrounding atmosphere completely surrounds the probe of the oxygen sensor A-5, so that the oxygen sensor A-5 is like being placed in the atmosphere.

[0059] S30, performing atmospheric calibration on the target oxygen sensor.

[0060] In the embodiment of the present application, conventional methods can be used to perform atmospheric calibration on the target oxygen sensor, which will not be described in detail.

[0061] In a possible implementation, the target oxygen sensor can be determined by setting a detection cycle or abnormality detection. In this regard, an oxygen sensor calibration method provided by an embodiment of the present application, wherein step S10 "determining the target oxygen sensor to be calibrated" can adopt the following steps:

[0062] If the specified detection cycle is currently reached, the oxygen sensor on each side of the gas engine is used as the target oxygen sensor; and / or

[0063] The second value of the oxygen sensor on each side of the gas engine is read, and the oxygen sensor whose second value is in an abnormal state is used as a target oxygen sensor.

[0064] Specifically, in the embodiment of the present application, after the engine has been running for a long time, if the specified detection cycle is reached, the oxygen sensors on each side of the gas engine are respectively used as target oxygen sensors. Figure 1 To give an example, when the specified detection cycle is reached, the oxygen sensor A-5 and the oxygen sensor B-5 can be used as target oxygen sensors respectively. For example, the oxygen sensor A-5 is first used as the target oxygen sensor, and the bypass valve B-7 is opened to form an atmosphere surrounding the oxygen sensor A-5 in the housing A-6, thereby completing the atmospheric calibration of the oxygen sensor A-5. Further, the oxygen sensor B-5 is used as the target oxygen sensor, and the bypass valve A-7 is opened to form an atmosphere surrounding the oxygen sensor B-5 in the housing B-6, thereby completing the atmospheric calibration of the oxygen sensor B-5.

[0065] In addition, the oxygen sensor on each side of the gas engine can also be monitored for abnormalities. Assuming that the normal value range of the oxygen sensor is [a, b], if the value currently output by the oxygen sensor (i.e., the second value) is not within the value range [a, b], the oxygen sensor can be used as the target oxygen sensor, and the value of the oxygen sensor is abnormal. Figure 1 For example, read the second values ​​currently output by oxygen sensor A-5 and oxygen sensor B-5, and determine whether they are within the value range [a, b]. Assuming that the second value of oxygen sensor A-5 is not within the value range [a, b], and the second value of oxygen sensor B-5 is within the value range [a, b], then use oxygen sensor A-5 as the target oxygen sensor, open bypass valve B-7 to form an atmosphere surrounding oxygen sensor A-5 in housing A-6, thereby completing the atmospheric calibration of oxygen sensor A-5.

[0066] In a possible implementation, since the temperature of the high-temperature exhaust gas is high and the temperature of the compressed gas is low, in order to avoid the sudden impact of the compressed gas causing excessive temperature changes in the target oxygen sensor, the bypass valve on the opposite side can be adjusted in the embodiment of the present application to alleviate the problem. Figure 3 , Figure 3 This is a partial method flow chart of an oxygen sensor calibration method provided in an embodiment of the present application. Figure 3 As shown, an oxygen sensor calibration method provided by an embodiment of the present application, wherein "controlling the bypass valve on the opposite side to open" in step S20 may include steps S201 to S202, and these steps are described in detail below.

[0067] S201, controlling the opening of the bypass valve from fully closed to a specified opening value, and maintaining the specified opening value for a specified time.

[0068] S202, controlling the bypass valve from a specified opening value to fully open according to a specified opening rate.

[0069] In the embodiment of the present application, for ease of understanding, the A-side branch is continued to be used as an example. It is assumed that the target oxygen sensor is determined to be oxygen sensor A-5, and the bypass valve B-7 of the B-side branch is controlled to open. The initial state of the bypass valve B-7 is fully closed (that is, the opening value is 0). First, the opening of the bypass valve B-7 is controlled from fully closed to a specified opening value (for example, 5%), and maintained for a specified time (for example, 5S). Further, the bypass valve B-7 is controlled from a specified opening value to fully open (that is, the opening value is 100%) at a specified opening rate (for example, 0.5° / s). This allows the bypass valve B-7 to have a time buffer from fully closed to fully open, and slowly open, thereby reducing the temperature impact of the compressed gas in the B-side branch on the oxygen sensor A-5.

[0070] In addition, after the atmospheric calibration of the oxygen sensor A-5 is completed, the opening of the bypass valve B-7 needs to be changed from fully open to fully closed. This process can be performed directly without time buffering. In this way, the surrounding atmosphere around the oxygen sensor A-5 disappears, and the oxygen sensor A-5 can be placed in normal high-temperature exhaust gas. In addition, the freezing of the first value of the oxygen sensor A-5 can be released, and the value output by the oxygen sensor A-5 can be read in real time, and the real-time read value can be used as the input of the engine closed-loop control.

[0071] It should be noted that during the calibration of oxygen sensor A-5, oxygen sensor B-5 of the B-side branch is still working normally, so the combustion of the B-side branch can be relatively adjusted, and the compressed gas of the B-side branch is sprayed to the turbine A-4 of the A-side branch, which will not affect the combustion. Based on this, the post-pressure gas extraction in this application must be taken from the opposite side, not this side.

[0072] In a possible implementation, the target oxygen sensor can also be troubleshooted based on the calibration result. Figure 4 , Figure 4 Another method flow chart of an oxygen sensor calibration method provided in an embodiment of the present application. Figure 4As shown, an oxygen sensor calibration method provided in an embodiment of the present application further includes steps S40 to S60, and these steps are described in detail below.

[0073] S40, after the atmospheric calibration is completed, reading a third value of the target oxygen sensor.

[0074] S50: If the third value is in a normal state, it is determined that the target oxygen sensor has completed calibration.

[0075] S60: If the third value is in an abnormal state, it is determined that the target oxygen sensor has a fault.

[0076] In the embodiment of the present application, for ease of understanding, the A-side branch is continued to be used as an example. Assuming that the target oxygen sensor is determined to be oxygen sensor A-5, after the atmospheric calibration of oxygen sensor A-5 is completed, the value currently output by oxygen sensor A-5 (i.e., the third value) is read. Continuing to assume that the value range of the oxygen sensor that can be normally used is [a, b], if the third value is within the value range [a, b], it means that the third value is in a normal state, and it is determined that the oxygen sensor A-5 has completed the calibration. On the contrary, if the third value is not within the value range [a, b], it means that the third value is in an abnormal state, and it is determined that the oxygen sensor A-5 is faulty and needs to be replaced with a new oxygen sensor.

[0077] Through the above description, an oxygen sensor calibration method provided in an embodiment of the present application can efficiently complete the calibration of the oxygen sensor while ensuring stable operation of the engine, effectively solving the time-consuming and labor-intensive problems of the current commonly used calibration methods, and improving the calibration efficiency, as well as the engine performance and reliability.

[0078] An oxygen sensor calibration method provided in an embodiment of the present application is introduced above, and a device for executing the above oxygen sensor calibration method will be introduced below.

[0079] An oxygen sensor calibration device provided in an embodiment of the present application is applied to an engine controller in a gas vehicle. The gas vehicle also includes a gas engine. The oxygen sensor on one side of the gas engine is located in its outer casing. The surface of the outer casing has multiple through holes. A branch pipeline is arranged on the air inlet pipe of the intercooler on one side of the gas engine between the compressor and the intercooler. The air outlet of the branch pipeline faces the oxygen sensor on the opposite side. A bypass valve is arranged on the branch pipeline.

[0080] See also Figure 5 , Figure 5 This is a schematic diagram of the structure of an oxygen sensor calibration device provided in an embodiment of the present application. Figure 5 As shown, an oxygen sensor calibration device provided in an embodiment of the present application includes:

[0081] A target determination module 10, used to determine a target oxygen sensor to be calibrated;

[0082] The atmospheric calibration module 20 is used to read and record the first value of the target oxygen sensor when the engine on the side where the target oxygen sensor is located is in a stable operating condition, and control the bypass valve on the opposite side to open, and spray compressed gas to the target oxygen sensor through the intercooler intake pipe and branch pipeline on the opposite side to form a surrounding atmosphere layer in the housing where the target oxygen sensor is located; and perform atmospheric calibration on the target oxygen sensor.

[0083] In a possible implementation, the through holes are evenly distributed on the surface of the housing.

[0084] In a possible implementation, the housing is a stainless steel housing.

[0085] In a possible implementation, the target determination module 10 is specifically configured to:

[0086] If the specified detection cycle is currently reached, the oxygen sensor on each side of the gas engine is used as the target oxygen sensor; and / or

[0087] The second value of the oxygen sensor on each side of the gas engine is read, and the oxygen sensor whose second value is in an abnormal state is used as a target oxygen sensor.

[0088] In a possible implementation, the atmospheric calibration module 20 for controlling the opening of the bypass valve on the opposite side is specifically used for:

[0089] Control the bypass valve's opening from fully closed to a specified opening value, and keep it at the specified opening value for a specified time; control the bypass valve from a specified opening value to fully open at a specified opening rate.

[0090] In a possible implementation, the atmosphere calibration module 20 is further used for:

[0091] After the atmospheric calibration is completed, the third value of the target oxygen sensor is read; if the third value is in a normal state, it is determined that the target oxygen sensor has completed the calibration; if the third value is in an abnormal state, it is determined that there is a fault in the target oxygen sensor.

[0092] It should be noted that the detailed functions of each module in the embodiment of the present application can be found in the corresponding disclosed part of the above oxygen sensor calibration method embodiment, which will not be repeated here.

[0093] The present application also provides an engine controller. Figure 6 , Figure 6 A schematic diagram of the structure of an engine controller provided in an embodiment of the present application. The engine controller in the embodiment of the present application may include but is not limited to fixed terminals such as mobile phones, notebook computers, PDAs (personal digital assistants), PADs (tablet computers), desktop computers, etc. Figure 6The engine controller shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0094] like Figure 6 As shown, the engine controller may include a processing device (e.g., a central processing unit, a graphics processing unit, etc.) 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage device 608 to a random access memory (RAM) 603. When the engine controller is powered on, various programs and data required for the operation of the engine controller are also stored in the RAM 603. The processing device 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0095] Typically, the following devices may be connected to the I / O interface 605: input devices 606 including, for example, a touch screen, a touch pad, a keyboard, a mouse, a camera, a microphone, an accelerometer, a gyroscope, etc.; output devices 607 including, for example, a liquid crystal display (LCD), a speaker, a vibrator, etc.; storage devices 608 including, for example, a memory card, a hard disk, etc.; and communication devices 609. The communication device 609 may allow the engine controller to communicate with other devices wirelessly or by wire to exchange data. Although Figure 6 An engine controller having various devices is shown, but it should be understood that it is not required to implement or have all of the devices shown. More or fewer devices may be implemented or have instead.

[0096] An embodiment of the present application also provides a computer program product including computer-readable instructions. When the computer-readable instructions are executed on an engine controller, the engine controller implements any oxygen sensor calibration method provided in the embodiment of the present application.

[0097] A computer-readable storage medium is also provided in an embodiment of the present application. The storage medium carries one or more computer programs. When the one or more computer programs are executed by an engine controller, the engine controller can implement any oxygen sensor calibration method provided in the embodiment of the present application.

[0098] It should also be noted that the device embodiments described above are merely schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. In addition, in the drawings of the device embodiments provided by the present application, the connection relationship between the modules indicates that there is a communication connection between them, which may be specifically implemented as one or more communication buses or signal lines.

[0099] Through the description of the above implementation mode, the technicians in the field can clearly understand that the present application can be implemented by means of software plus necessary general hardware, and of course, it can also be implemented by special hardware including special integrated circuits, special CPUs, special memories, special components, etc. In general, all functions completed by computer programs can be easily implemented by corresponding hardware, and the specific hardware structure used to implement the same function can also be various, such as analog circuits, digital circuits or special circuits. However, for the present application, software program implementation is a better implementation mode in more cases. Based on such an understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a readable storage medium, such as a computer floppy disk, a U disk, a mobile hard disk, a ROM, a RAM, a disk or an optical disk, etc., including a number of instructions to enable a computer device (which can be a personal computer, a training device, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0100] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0101] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website site, a computer, a training device, or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, training device, or data center. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a training device, a data center, etc. that includes one or more available media integrations. The available medium may be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)), etc.

Claims

1. A method for calibrating an oxygen sensor, characterized in that: The oxygen sensor calibration method is applied to an engine controller in a gas vehicle, the gas vehicle further comprising a gas engine, a single oxygen sensor in the gas engine being located in a housing thereof, a surface of the housing having a plurality of through holes, a branch pipeline being arranged on a single intercooler intake pipe between a compressor and an intercooler in the gas engine, an outlet of the branch pipeline facing the oxygen sensor on the opposite side, a bypass valve being arranged on the branch pipeline, and the oxygen sensor calibration method comprising: Determine the target oxygen sensor to be calibrated; When the engine on the side where the target oxygen sensor is located is in a stable operating condition, a first value of the target oxygen sensor is read and recorded, and the bypass valve on the opposite side is controlled to open, and compressed gas is sprayed toward the target oxygen sensor through the intercooler intake pipe on the opposite side and the branch pipeline to form a surrounding atmosphere in the housing where the target oxygen sensor is located; performing atmospheric calibration on the target oxygen sensor; The step of determining a target oxygen sensor to be calibrated includes: If the specified detection cycle is currently reached, the oxygen sensor on each side of the gas engine is used as the target oxygen sensor; and / or reading a second value of the oxygen sensor on each side of the gas engine, and taking the oxygen sensor whose second value is in an abnormal state as the target oxygen sensor; The controlling the bypass valve on the opposite side to open comprises: Controlling the opening of the bypass valve from fully closed to a specified opening value, and maintaining the specified opening value for a specified time; The bypass valve is controlled from the specified opening value to fully open according to the specified opening rate.

2. The oxygen sensor calibration method according to claim 1, characterized in that: The through holes are evenly distributed on the surface of the housing.

3. The oxygen sensor calibration method according to claim 1, characterized in that: The shell is a stainless steel shell.

4. The oxygen sensor calibration method according to claim 1, characterized in that: The oxygen sensor calibration method further includes: After the atmospheric calibration is completed, reading a third value of the target oxygen sensor; If the third value is in a normal state, determining that the target oxygen sensor has completed calibration; If the third value is in an abnormal state, it is determined that the target oxygen sensor is malfunctioning.

5. An oxygen sensor calibration device, characterized in that: The oxygen sensor calibration device is applied to an engine controller in a gas vehicle, the gas vehicle further comprising a gas engine, the oxygen sensor on one side of the gas engine being located in a housing thereof, the surface of the housing having a plurality of through holes, a branch pipeline being arranged on an air inlet pipe of an intercooler on one side of the gas engine between a compressor and an intercooler, the outlet of the branch pipeline facing the oxygen sensor on the opposite side, a bypass valve being arranged on the branch pipeline, and the oxygen sensor calibration device comprising: A target determination module, used for determining a target oxygen sensor to be calibrated; an atmospheric calibration module, configured to read and record a first value of the target oxygen sensor when the engine on the side where the target oxygen sensor is located is in a stable operating condition, and control the bypass valve on the opposite side to open, and spray compressed gas to the target oxygen sensor through the intercooler intake pipe on the opposite side and the branch pipeline to form a surrounding atmosphere layer in the housing where the target oxygen sensor is located; and perform atmospheric calibration on the target oxygen sensor; The target determination module determines a target oxygen sensor to be calibrated, including: If the specified detection cycle is currently reached, the oxygen sensor on each side of the gas engine is used as the target oxygen sensor; and / or reading a second value of the oxygen sensor on each side of the gas engine, and taking the oxygen sensor whose second value is in an abnormal state as the target oxygen sensor; The atmospheric calibration module controls the bypass valve on the opposite side to open, including: Controlling the opening of the bypass valve from fully closed to a specified opening value, and maintaining the specified opening value for a specified time; The bypass valve is controlled from the specified opening value to fully open according to the specified opening rate.

6. A computer program product, characterized in that The method comprises computer-readable instructions, and when the computer-readable instructions are executed on an engine controller, the engine controller is enabled to implement the oxygen sensor calibration method according to any one of claims 1 to 4.

7. An engine controller, characterized in that: The method comprises at least one processor and a memory connected to the processor, wherein: The memory is used to store computer programs; The processor is used to execute the computer program so that the engine controller can implement the oxygen sensor calibration method according to any one of claims 1 to 4.

8. A computer storage medium, characterized in that The storage medium carries one or more computer programs, and when the one or more computer programs are executed by an engine controller, the engine controller can implement the oxygen sensor calibration method as described in any one of claims 1 to 4.

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