NOx Sensor Calibration Method, Calibration Device and Vehicle for V-Type Engine

Abstract

An embodiment of the present invention discloses a calibration method, a calibration device and a vehicle for a nitrogen oxide sensor of a V-type engine. The calibration method for the nitrogen oxide sensor of the V-type engine includes: confirming that the V-type engine is in an operating state; in response to a first nitrogen oxide sensor calibration signal, stopping the operation of the first exhaust cylinder and controlling the second exhaust cylinder to enter an idle condition; counting whether the gas exchange process of the first exhaust cylinder reaches a first preset condition; activating the heating of the first nitrogen oxide sensor, and the first nitrogen oxide sensor obtaining an actually measured standard oxygen concentration value and an actually measured standard nitrogen oxide concentration value; correcting the corresponding relationship between the actually measured oxygen concentration value and the output oxygen concentration value, and correcting the corresponding relationship between the actually measured nitrogen oxide concentration value and the output nitrogen oxide concentration value. The embodiment of the present invention realizes automatic calibration without disassembling the nitrogen oxide sensor, avoids damage to the nitrogen oxide sensor due to thermal stress, and eliminates the man-hours and maintenance costs required for calibrating the sensor.

Description

Technical Field

[0001] Embodiments of the present invention relate to engine sensor technology, and in particular, to a calibration method, a calibration device, and a vehicle for a nitrogen oxide sensor of a V-type engine. Background Art

[0002] During the use of a vehicle, maintenance is an important and indispensable key point.

[0003] In related technologies, the maintenance of the nitrogen oxide sensor of an engine often adopts the method of removing the nitrogen oxide sensor from the engine exhaust pipe. This not only consumes a lot of man-hours but also incurs high maintenance costs. Especially for a gas engine, due to the higher hydrogen content in the gas fuel compared to fuels such as gasoline, a large amount of water vapor generated during gas combustion may condense on the ceramic surface of the nitrogen oxide sensor. Due to the presence of condensed water droplets on the ceramic surface, activating the nitrogen oxide sensor rashly may cause uneven thermal stress on the ceramic surface during high-temperature heating of the nitrogen oxide sensor, and then cracks may occur, resulting in losses. Therefore, for the nitrogen oxide sensor of a gas engine, it is more necessary to wipe it and then perform maintenance and calibration after removal. Summary of the Invention

[0004] The present invention provides a calibration method, a calibration device, and a vehicle for a nitrogen oxide sensor of a V-type engine, which can achieve automatic calibration without removing the nitrogen oxide sensor of the engine, eliminating the man-hours and maintenance costs required for calibrating the sensor.

[0005] In a first aspect, an embodiment of the present invention provides a calibration method for a nitrogen oxide sensor of a V-type engine. The V-type engine includes a first exhaust cylinder and a second exhaust cylinder, and a first nitrogen oxide sensor is installed in the exhaust pipe of the first exhaust cylinder. The method includes:

[0006] Confirm that the V-type engine is in an operating state;

[0007] In response to a first nitrogen oxide sensor calibration signal, stop the operation of the first exhaust cylinder and control the second exhaust cylinder to enter an idle condition;

[0008] Count whether the gas exchange process of the first exhaust cylinder reaches a first preset condition;

[0009] If so, activate the heating of the first nitrogen oxide sensor, and the first nitrogen oxide sensor obtains a measured standard oxygen concentration value and a measured standard nitrogen oxide concentration value;

[0010] Correct the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correct the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value.

[0011] Optionally, a second nitrogen oxide sensor is installed in the exhaust pipe of the second exhaust cylinder. After correcting the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correcting the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value, the following steps are further included:

[0012] In response to the calibration signal of the second nitrogen oxide sensor, stop the operation of the second exhaust cylinder and control the first exhaust cylinder to enter the idle condition;

[0013] Statistically determine whether the air exchange process of the second exhaust cylinder reaches a second preset condition;

[0014] If so, activate the heating of the second nitrogen oxide sensor, and the second nitrogen oxide sensor obtains the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value;

[0015] According to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value, correct the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correct the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value.

[0016] Optionally, the first preset condition includes that the cumulative operation time of the second exhaust cylinder reaches a preset operation time; or, the air exchange volume of the first exhaust cylinder reaches a preset air exchange volume.

[0017] Optionally, the second preset condition includes that the cumulative operation time of the first exhaust cylinder reaches a preset operation time; or, the air exchange volume of the second exhaust cylinder reaches a preset air exchange volume.

[0018] Optionally, activating the heating of the first nitrogen oxide sensor includes controlling the first nitrogen oxide sensor to self-heat to a preset self-heating temperature.

[0019] Optionally, correcting the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correcting the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value includes:

[0020] If the deviation between the measured standard oxygen concentration value and the atmospheric oxygen concentration value is within a preset oxygen concentration deviation, determine an oxygen concentration correction value according to the measured standard oxygen concentration value, and the oxygen concentration correction value is used to combine with the measured oxygen concentration value to obtain the output oxygen concentration value;

[0021] If the deviation between the measured standard nitrogen oxide concentration value and the atmospheric nitrogen oxide concentration value is within the preset nitrogen oxide deviation, determine a nitrogen oxide correction value according to the measured standard nitrogen oxide concentration value, and the nitrogen oxide correction value is used to combine with the measured nitrogen oxide concentration value to obtain the output nitrogen oxide concentration value.

[0022] Optionally, the correction of the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value includes:

[0023] If the deviation between the measured standard oxygen concentration value and the atmospheric oxygen concentration value is greater than the preset oxygen concentration deviation, end the calibration of the first nitrogen-oxygen sensor and report the first nitrogen-oxygen sensor fault information;

[0024] If the deviation between the measured standard nitrogen oxide concentration value and the atmospheric nitrogen oxide concentration value is greater than the preset nitrogen oxide deviation, end the calibration of the first nitrogen-oxygen sensor and report the first nitrogen-oxygen sensor fault information.

[0025] In a second aspect, an embodiment of the present invention further provides a calibration device for a nitrogen-oxygen sensor of a V-type engine. The V-type engine includes a first exhaust cylinder and a second exhaust cylinder, and a first nitrogen-oxygen sensor is installed in the exhaust pipe of the first exhaust cylinder, including:

[0026] An engine state confirmation module for confirming that the V-type engine is in an operating state;

[0027] A cylinder control module for stopping the operation of the first exhaust cylinder and controlling the second exhaust cylinder to enter the idle condition in response to a first nitrogen-oxygen sensor calibration signal;

[0028] A ventilation control module for counting whether the ventilation process of the first exhaust cylinder reaches a first preset condition;

[0029] A concentration acquisition module for activating the heating of the first nitrogen-oxygen sensor after reaching the first preset condition, and the first nitrogen-oxygen sensor obtains a measured standard oxygen concentration value and a measured standard nitrogen oxide concentration value;

[0030] A corresponding relationship determination module for correcting the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correcting the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value.

[0031] Optionally, it further includes:

[0032] The cylinder control module is further configured to stop the operation of the second exhaust cylinder and control the first exhaust cylinder to enter the idle condition in response to a second nitrogen-oxygen sensor calibration signal;

[0033] The ventilation control module is further configured to count whether the ventilation process of the second exhaust cylinder reaches a second preset condition;

[0034] The concentration acquisition module is further configured to activate the heating of the second nitrogen oxide sensor after the second preset condition is reached, and the second nitrogen oxide sensor obtains the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value;

[0035] The corresponding relationship determination module is further configured to correct the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correct the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value.

[0036] In a third aspect, an embodiment of the present invention further provides a vehicle using any one of the above nitrogen oxide sensor calibration methods for a V-type engine.

[0037] The nitrogen oxide sensor calibration method according to the embodiment of the present invention is applicable to a V-type engine, and the V-type engine includes a first exhaust cylinder and a second exhaust cylinder. A first nitrogen oxide sensor is installed in the exhaust pipe of the first exhaust cylinder. The method includes: confirming that the V-type engine is in an operating state. In response to a first nitrogen oxide sensor calibration signal, stop the operation of the first exhaust cylinder and control the second exhaust cylinder to enter an idle condition. Count whether the ventilation process of the first exhaust cylinder reaches a first preset condition. If so, activate the heating of the first nitrogen oxide sensor, and the first nitrogen oxide sensor obtains the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value. Correct the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correct the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value. After the first exhaust cylinder stops operating, the gas in the exhaust pipe of the first exhaust cylinder is made to flow and heated by the remaining temperature in the first exhaust cylinder and the exhaust pipe by driving the first exhaust cylinder with the second exhaust cylinder, so that the condensed water on the oxygen sensor is blown off and dried by the flowing hot air. On the other hand, due to the operation of the first exhaust cylinder after being driven, the air in the engine exhaust pipe is frequently exchanged with the outside air, so that the gas in the engine exhaust pipe is replaced with air. The purpose of enabling the nitrogen oxide sensor to contact air without disassembling the nitrogen oxide sensor is achieved, providing a basis for the calibration step. The embodiment of the present invention realizes automatic calibration without having to disassemble the nitrogen oxide sensor, avoids damage to the nitrogen oxide sensor due to thermal stress, and eliminates the man-hours and maintenance costs required for calibrating the sensor. Description of the Drawings

[0038] Figure 1 It is a step flow chart of a nitrogen oxide sensor calibration method for a V-type engine provided by an embodiment of the present invention;

[0039] Figure 2 Schematic structural diagram of a nitrogen oxide sensor calibration device for a V-type engine provided by an embodiment of the present invention. Detailed implementation manners

[0040] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that only parts related to the present invention rather than all structures are shown in the drawings for the convenience of description.

[0041] An embodiment of the present invention provides a nitrogen oxide sensor calibration method for a V-type engine. The V-type engine includes a first exhaust cylinder and a second exhaust cylinder, and a first nitrogen oxide sensor is installed in the exhaust pipe of the first exhaust cylinder.

[0042] Among them, the cylinders of the V-type engine are divided into two rows, namely the first row and the second row, and the exhaust systems of the two rows of cylinders are independent of each other. Each row has a fuel injection valve. The nitrogen oxide sensor is also called a nitrogen oxide sensor. The embodiment of the present invention does not limit the structure of the nitrogen oxide sensor. Exemplarily, the structure of the nitrogen oxide sensor may include three gas chambers. The exhaust gas enters from the first gas chamber, and most of the oxygen in the exhaust gas is pumped out. The corresponding oxygen concentration value (i.e., lambda value) in the exhaust gas can be calculated through the generated pump current. The second gas chamber further pumps out the remaining trace oxygen, and the third gas chamber catalyzes and decomposes the nitrogen oxides NOx in the exhaust gas into nitrogen N2 and oxygen O2, and then pumps out the oxygen. The corresponding pump current can be used to calculate the content of NOX (the content is at the ppm unit level).

[0043] Figure 1 Step flow chart of a nitrogen oxide sensor calibration method for a V-type engine provided by an embodiment of the present invention, refer to Figure 1 . The nitrogen oxide sensor calibration method for a V-type engine includes:

[0044] S1: Confirm that the V-type engine is in a running state;

[0045] Among them, since in the subsequent steps, the nitrogen oxide sensor needs to be baked by the residual temperature of the engine and the exhaust pipe, and at the same time ensure that the ceramic surface of the first nitrogen oxide sensor will not freeze due to too low temperature, it is necessary to confirm that the V-type engine is in a running state.

[0046] If the V-type engine is in a running state, step S21 is executed.

[0047] S21: In response to the first nitrogen oxide sensor calibration signal, stop the operation of the first exhaust cylinder and control the second exhaust cylinder to enter the idle working condition;

[0048] After obtaining the calibration signal of the first nitrogen oxide sensor, the first exhaust cylinder is controlled to stop working, and the first exhaust cylinder is driven to operate by the second exhaust cylinder in the idle state.

[0049] If the V-type engine is not in the running state, step S22 is executed, that is, the calibration of the first nitrogen oxide sensor is ended.

[0050] S3: Statistically determine whether the gas exchange process of the first exhaust cylinder reaches a first preset condition.

[0051] Among them, since the subsequent steps require the first nitrogen oxide sensor to measure the nitrogen oxide concentration value and the oxygen concentration value. The nitrogen oxide sensor needs to be heated to complete the accurate measurement. For a general nitrogen oxide sensor, when working at about 800 degrees Celsius, the measured lambda value and NOX concentration are valid and reliable. Therefore, the nitrogen oxide sensor needs to be self-heated to 800 degrees Celsius. However, before heating, considering that after the first exhaust cylinder stops, due to the condensation of water vapor in the exhaust pipe, water droplets will form on the surface ceramic of the nitrogen oxide sensor. If the nitrogen oxide sensor is directly heated when there is water vapor or condensed water droplets on it, the ceramic detection part of the nitrogen oxide sensor will be subjected to thermal stress and cracks will appear, causing losses. Therefore, dew point detection needs to be carried out before the nitrogen oxide sensor is heated. The embodiment of the present invention provides a dew point detection method. That is, the ignition and gas supply of the first exhaust cylinder are stopped, so that each cylinder of the first exhaust cylinder stops working. The second exhaust cylinder drives the first exhaust cylinder, and the residual exhaust energy of the first exhaust cylinder is used to continuously purge and dry the water droplets on the nitrogen oxide sensor. The first preset condition for passing the dew point detection can be determined according to actual needs. Exemplarily, the embodiment of the present invention provides the following two optional first preset conditions. Optionally, the first preset condition includes that the cumulative operation time of the second exhaust cylinder reaches the preset operation time. Or, optionally, the first preset condition includes that the gas exchange volume of the first exhaust cylinder reaches the preset gas exchange volume. After purging and drying for the preset operation time or the preset gas exchange volume, it is considered that there are no more water droplets on the nitrogen oxide sensor, and it is judged that the dew point detection has passed. The preset operation time and the preset gas exchange volume can both be determined according to actual needs.

[0052] If the gas exchange process of the first exhaust cylinder reaches the first preset condition, operation S41 is performed.

[0053] S41: Activate the heating of the first nitrogen oxide sensor, and the first nitrogen oxide sensor obtains the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value.

[0054] Among them, during the process that the first exhaust cylinder is driven by the second exhaust cylinder to operate, the intake valves of each cylinder intake fresh air and discharge it from the exhaust valves. After several working cycles, the exhaust gas in the exhaust pipe of the first exhaust cylinder is cleaned, so that there is only air in the exhaust pipe of the first exhaust cylinder. At this time, the dew point detection of nitrogen oxides in the first exhaust cylinder also passes, and the detection of oxygen concentration value and nitrogen oxides concentration value can be carried out. Since the oxygen concentration and nitrogen oxides concentration are stable and unchanged during the control, the corresponding values of the measured standard oxygen concentration value and the measured standard nitrogen oxides concentration value obtained are the standard values in the air. When controlling the heating of the first nitrogen oxygen sensor, the oxygen sensor can be controlled to self-heat to a preset self-heating temperature, and the preset self-heating temperature can be determined according to actual needs. Exemplarily, the nitrogen oxygen sensor can be controlled to self-heat to 800 °C.

[0055] If the gas exchange process of the engine does not reach the first preset condition, operation S42 is performed, that is, the gas exchange operation is continued.

[0056] S5: Correct the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correct the corresponding relationship between the measured nitrogen oxides concentration value and the output nitrogen oxides concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxides concentration value.

[0057] Among them, the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value can be compared with the theoretical oxygen concentration and the theoretical nitrogen oxide concentration in the air, and then the output oxygen concentration value and the output nitrogen oxide concentration value can be calibrated. Optionally, correcting the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correcting the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value includes: if the deviation between the measured standard oxygen concentration value and the atmospheric oxygen concentration value is within the preset oxygen concentration deviation, then determine the oxygen concentration correction value according to the measured standard oxygen concentration value, and the oxygen concentration correction value is used to combine with the measured oxygen concentration value to obtain the output oxygen concentration value. If the deviation between the measured standard nitrogen oxide concentration value and the atmospheric nitrogen oxide concentration value is within the preset nitrogen oxide deviation, then determine the nitrogen oxide correction value according to the measured standard nitrogen oxide concentration value, and the nitrogen oxide correction value is used to combine with the measured nitrogen oxide concentration value to obtain the output nitrogen oxide concentration value. Since the nitrogen oxide sensor of the first exhaust cylinder is measured in the atmosphere in the exhaust pipe, the lambda value should theoretically be about 15.9 and the NOX should theoretically be 0. Compare the lambda value and the NOX value with 15.9 and 0 respectively. If the obtained deviation is within the two maximum acceptable deviations of the preset oxygen concentration deviation and the preset nitrogen oxide deviation, correct the lambda measurement value and the NOX concentration, and store the respective correction values in the vehicle's electronic control unit (ECU). During other operating conditions of the engine, the output values of the nitrogen oxygen sensor are also corrected. Among them, the preset oxygen concentration deviation and the preset nitrogen oxide deviation can be determined according to actual needs. Optionally, if the deviation between the measured standard oxygen concentration value and the atmospheric oxygen concentration value is greater than the preset oxygen concentration deviation, end the calibration of the first nitrogen oxygen sensor and report the first nitrogen oxygen sensor fault information. If the deviation between the measured standard nitrogen oxide concentration value and the atmospheric nitrogen oxide concentration value is greater than the preset nitrogen oxide deviation, end the calibration of the first nitrogen oxygen sensor and report the first nitrogen oxygen sensor fault information. The error of the nitrogen oxygen sensor should be within the preset deviation. If it exceeds the preset deviation, it indicates that there is a fault in the nitrogen oxygen sensor. At this time, the nitrogen oxygen sensor fault information should be reported to the ECU to remind the user to replace the sensor in time.

[0058] After the first exhaust cylinder stops operating, the gas in the exhaust pipe of the first exhaust cylinder is made to flow and is heated by the residual heat in the first exhaust cylinder and the exhaust pipe by driving the first exhaust cylinder with the second exhaust cylinder, so that the condensed water on the oxygen sensor is blown off and dried by the flowing hot air. On the other hand, due to the operation of the first exhaust cylinder after being driven, the air in the engine exhaust pipe is frequently exchanged with the outside air, so that the gas in the engine exhaust pipe is replaced by air. The purpose of enabling the nitrogen oxide sensor to contact air without disassembling the nitrogen oxide sensor is achieved, providing a basis for the calibration step. The embodiment of the present invention realizes automatic calibration without having to disassemble the nitrogen oxide sensor, avoiding damage to the nitrogen oxide sensor due to thermal stress and eliminating the man-hours and maintenance costs required for calibrating the sensor.

[0059] Optionally, a second nitrogen oxide sensor is installed in the exhaust pipe of the second exhaust cylinder. After correcting the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correcting the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value, it further includes:

[0060] In response to the calibration signal of the second nitrogen oxide sensor, stop the operation of the second exhaust cylinder and control the first exhaust cylinder to enter the idle condition;

[0061] Statistically determine whether the air exchange process of the second exhaust cylinder reaches a second preset condition;

[0062] If so, activate the heating of the second nitrogen oxide sensor, and the second nitrogen oxide sensor obtains the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value;

[0063] According to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value, correct the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correct the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value.

[0064] Among them, after the calibration of the first nitrogen oxide sensor is completed, the calibration of the second nitrogen oxide sensor can also be carried out. By driving the second exhaust cylinder to operate with the first exhaust cylinder, the second nitrogen oxide sensor can be calibrated. The second preset condition can be determined according to actual needs. The embodiment of the present invention exemplarily gives the following two optional second preset conditions. That is, the second preset condition may include that the cumulative operating time of the first exhaust cylinder reaches the preset operating time. Or, the second preset condition may include that the air exchange volume of the second exhaust cylinder reaches the preset air exchange volume.

[0065] Figure 2 It is a schematic structural diagram of a nitrogen oxide sensor calibration device for a V-type engine provided by an embodiment of the present invention. Refer to Figure 2。The embodiment of the present invention also provides a calibration device for a nitrogen oxide sensor of a V-type engine. The V-type engine includes a first exhaust cylinder and a second exhaust cylinder. A first nitrogen oxide sensor is installed in the exhaust pipe of the first exhaust cylinder, and it includes:

[0066] An engine state confirmation module 1, configured to confirm that the V-type engine is in an operating state;

[0067] A cylinder control module 2, configured to stop the operation of the first exhaust cylinder and control the second exhaust cylinder to enter the idle condition in response to a first nitrogen oxide sensor calibration signal;

[0068] A ventilation control module 3, configured to count whether the ventilation process of the first exhaust cylinder reaches a first preset condition;

[0069] A concentration acquisition module 4, configured to activate the heating of the first nitrogen oxide sensor after reaching the first preset condition, and the first nitrogen oxide sensor obtains a measured standard oxygen concentration value and a measured standard nitrogen oxide concentration value;

[0070] A corresponding relationship determination module 5, configured to correct the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correct the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value.

[0071] Optionally, it further includes:

[0072] The cylinder control module is further configured to stop the operation of the second exhaust cylinder and control the first exhaust cylinder to enter the idle condition in response to a second nitrogen oxide sensor calibration signal;

[0073] The ventilation control module is further configured to count whether the ventilation process of the second exhaust cylinder reaches the first preset condition;

[0074] The concentration acquisition module is further configured to activate the heating of the second nitrogen oxide sensor after reaching the first preset condition, and the second nitrogen oxide sensor obtains a measured standard oxygen concentration value and a measured standard nitrogen oxide concentration value;

[0075] The corresponding relationship determination module is further configured to correct the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correct the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value.

[0076] Optionally, the first preset condition includes that the cumulative operation time of the second exhaust cylinder reaches a preset operation time.

[0077] Optionally, the first preset condition includes that the ventilation volume of the first exhaust cylinder reaches a preset ventilation volume.

[0078] Optionally, activating the heating of the first nitrogen oxide sensor includes controlling the first nitrogen oxide sensor to self-heat to a preset self-heating temperature.

[0079] Optionally, correcting the correspondence between the measured oxygen concentration value and the output oxygen concentration value, and correcting the correspondence between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value includes:

[0080] If the deviation between the measured standard oxygen concentration value and the atmospheric oxygen concentration value is within a preset oxygen concentration deviation, determine an oxygen concentration correction value according to the measured standard oxygen concentration value. The oxygen concentration correction value is used to combine with the measured oxygen concentration value to obtain the output oxygen concentration value;

[0081] If the deviation between the measured standard nitrogen oxide concentration value and the atmospheric nitrogen oxide concentration value is within a preset nitrogen oxide deviation, determine a nitrogen oxide correction value according to the measured standard nitrogen oxide concentration value. The nitrogen oxide correction value is used to combine with the measured nitrogen oxide concentration value to obtain the output nitrogen oxide concentration value.

[0082] Optionally, correcting the correspondence between the measured oxygen concentration value and the output oxygen concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value includes:

[0083] If the deviation between the measured standard oxygen concentration value and the atmospheric oxygen concentration value is greater than the preset oxygen concentration deviation, end the calibration of the first nitrogen-oxygen sensor and report the first nitrogen-oxygen sensor fault information;

[0084] If the deviation between the measured standard nitrogen oxide concentration value and the atmospheric nitrogen oxide concentration value is greater than the preset nitrogen oxide deviation, end the calibration of the first nitrogen-oxygen sensor and report the first nitrogen-oxygen sensor fault information.

[0085] The embodiment of the present invention also provides a vehicle using any one of the above nitrogen-oxygen sensor calibration methods for a V-type engine.

[0086] Among them, since the embodiment of the present invention uses any one of the above nitrogen-oxygen sensor calibration methods for a V-type engine, it has beneficial effects corresponding to the nitrogen-oxygen sensor calibration method for a V-type engine.

[0087] Note that the above is only a preferred embodiment of the present invention and the applied technical principle. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments, combinations with each other, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, it can also include more other equivalent embodiments, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A calibration method for a nitrogen oxide sensor of a V-type engine, the V-type engine including a first exhaust cylinder and a second exhaust cylinder, and a first nitrogen oxide sensor being installed in the exhaust pipe of the first exhaust cylinder, characterized in that, Including: Confirm that the V-type engine is in an operating state; In response to a first nitrogen oxide sensor calibration signal, stop the operation of the first exhaust cylinder and control the second exhaust cylinder to enter an idle condition; Statistically determine whether the gas exchange process of the first exhaust cylinder reaches a first preset condition; If so, activate the heating of the first nitrogen oxide sensor, and the first nitrogen oxide sensor obtains a measured standard oxygen concentration value and a measured standard nitrogen oxide concentration value. Wherein, activating the heating of the first nitrogen oxide sensor includes controlling the first nitrogen oxide sensor to self-heat to a preset self-heating temperature; Correct the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correct the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value.

2. The calibration method of the nitrogen oxide sensor of the V-type engine according to claim 1, wherein a second nitrogen oxide sensor is installed in the exhaust pipe of the second exhaust cylinder, and is characterized in that After correcting the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correcting the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value, it further includes: In response to a second nitrogen oxide sensor calibration signal, stop the operation of the second exhaust cylinder and control the first exhaust cylinder to enter an idle condition; Statistically determine whether the gas exchange process of the second exhaust cylinder reaches a second preset condition; If so, activate the heating of the second nitrogen oxide sensor, and the second nitrogen oxide sensor obtains the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value; Correct the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correct the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value.

3. The method for calibrating a nitrogen oxide sensor of a V-type engine according to claim 1, characterized in that, The first preset condition includes that the cumulative operating time of the second exhaust cylinder reaches a preset operating time; or the gas exchange volume of the first exhaust cylinder reaches a preset gas exchange volume.

4. The calibration method of the nitrogen oxide sensor of the V-type engine according to claim 2, characterized in that, The second preset condition includes that the cumulative operating time of the first exhaust cylinder reaches a preset operating time; Or the gas exchange volume of the second exhaust cylinder reaches a preset gas exchange volume.

5. The calibration method of the nitrogen oxide sensor of the V-type engine according to claim 1, wherein, Correcting the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value, and correcting the corresponding relationship between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value includes: If the deviation between the measured standard oxygen concentration value and the atmospheric oxygen concentration value is within a preset oxygen concentration deviation, determine an oxygen concentration correction value according to the measured standard oxygen concentration value. The oxygen concentration correction value is used to combine with the measured oxygen concentration value to obtain the output oxygen concentration value; If the deviation between the measured standard nitrogen oxide concentration value and the atmospheric nitrogen oxide concentration value is within a preset nitrogen oxide deviation, determine a nitrogen oxide correction value according to the measured standard nitrogen oxide concentration value. The nitrogen oxide correction value is used to combine with the measured nitrogen oxide concentration value to obtain the output nitrogen oxide concentration value.

6. The calibration method of the nitrogen oxide sensor of the V-type engine according to claim 1, characterized in that, Correcting the corresponding relationship between the measured oxygen concentration value and the output oxygen concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value includes: If the deviation between the measured standard oxygen concentration value and the atmospheric oxygen concentration value is greater than the preset oxygen concentration deviation, the calibration of the first nitrogen-oxygen sensor is terminated, and the fault information of the first nitrogen-oxygen sensor is reported. If the deviation between the measured standard nitrogen oxide concentration value and the atmospheric nitrogen oxide concentration value is greater than the preset nitrogen oxide deviation, the calibration of the first nitrogen-oxygen sensor is terminated, and the fault information of the first nitrogen-oxygen sensor is reported.

7. A calibration device for a nitrogen oxide sensor of a V-type engine, the V-type engine comprising a first exhaust cylinder and a second exhaust cylinder, wherein a first nitrogen oxide sensor is installed in an exhaust pipe of the first exhaust cylinder, characterized in that, Including: An engine state confirmation module for confirming that the V-type engine is in an operating state; A cylinder control module for stopping the operation of the first exhaust cylinder and controlling the second exhaust cylinder to enter the idle condition in response to the first nitrogen-oxygen sensor calibration signal; A ventilation control module for counting whether the ventilation process of the first exhaust cylinder reaches a first preset condition; A concentration acquisition module for activating the heating of the first nitrogen-oxygen sensor after reaching the first preset condition, and the first nitrogen-oxygen sensor obtains the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value. Wherein, activating the heating of the first nitrogen-oxygen sensor includes controlling the first nitrogen-oxygen sensor to self-heat to a preset self-heating temperature; A correspondence determination module for correcting the correspondence between the measured oxygen concentration value and the output oxygen concentration value, and correcting the correspondence between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value.

8. The nitrogen oxide sensor calibration device for a V-type engine according to claim 7, characterized in that, Further including: The cylinder control module is further configured to stop the operation of the second exhaust cylinder and control the first exhaust cylinder to enter the idle condition in response to the second nitrogen-oxygen sensor calibration signal; The ventilation control module is further configured to count whether the ventilation process of the second exhaust cylinder reaches a second preset condition; The concentration acquisition module is further configured to activate the heating of the second nitrogen-oxygen sensor after reaching the second preset condition, and the second nitrogen-oxygen sensor obtains the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value; The correspondence determination module is further configured to correct the correspondence between the measured oxygen concentration value and the output oxygen concentration value, and correct the correspondence between the measured nitrogen oxide concentration value and the output nitrogen oxide concentration value according to the measured standard oxygen concentration value and the measured standard nitrogen oxide concentration value.

9. A vehicle, characterized in that, Use the nitrogen-oxygen sensor calibration method for the V-type engine according to any one of claims 1-6.

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