CN113931758A - Wide-range oxygen sensor aging diagnosis method and device, readable storage medium and vehicle - Google Patents
Wide-range oxygen sensor aging diagnosis method and device, readable storage medium and vehicle Download PDFInfo
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- CN113931758A CN113931758A CN202010605003.3A CN202010605003A CN113931758A CN 113931758 A CN113931758 A CN 113931758A CN 202010605003 A CN202010605003 A CN 202010605003A CN 113931758 A CN113931758 A CN 113931758A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
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Abstract
The invention discloses a method and a device for diagnosing aging of a wide-area oxygen sensor, a readable storage medium and a vehicle, wherein the method for diagnosing aging of the wide-area oxygen sensor comprises the following steps: acquiring the running working condition of the vehicle, and judging whether the vehicle meets the aging diagnosis condition of entering the wide-area oxygen sensor according to the running working condition; if the vehicle meets the aging diagnosis condition of the wide-range oxygen sensor, acquiring the pump current of the wide-range oxygen sensor; acquiring an air-fuel ratio according to the pump current; recording the time taken by the air-fuel ratio to increase from a first preset value to a second preset value as a first time, and recording the time taken by the air-fuel ratio to decrease from the second preset value to the first preset value as a second time; and judging whether the wide-area oxygen sensor has aging faults or not according to the first time and the second time. Therefore, the method can reduce the diagnosis condition of the aging of the wide-range oxygen sensor and improve the accuracy of the diagnosis result.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted diagnosis systems, in particular to a wide-range oxygen sensor aging diagnosis method, a wide-range oxygen sensor aging diagnosis device, a computer-readable storage medium and a vehicle.
Background
In the related art, an aging monitoring system and a fault diagnosis method for a vehicle wide-range oxygen sensor are provided. The technology utilizes components such as an engine, a wide-area oxygen sensor, an ECU controller, a wide-area oxygen sensor intelligent driving chip and the like to carry out aging monitoring on the wide-area oxygen sensor. The ECU controller is responsible for detecting and judging the aging faults of the wide-range oxygen sensor, compares a lambda signal and a lambda reference signal which are actually acquired from the wide-range oxygen sensor by using forced oscillation, calculates the minimum slope ratio of the lambda signal and the lambda reference signal, and judges whether the wide-range oxygen sensor has the aging faults or not according to the slope ratio.
The aging degree of the wide-range oxygen sensor is monitored by mainly utilizing the characteristic that the signal of the wide-range oxygen sensor can periodically oscillate along with lambda. However, the working principle of the wide-area oxygen sensor is different from that of a switching oxygen sensor, the wide-area oxygen sensor is very sensitive to air-fuel ratio change, and a stable oscillation lambda waveform is difficult to obtain, so that the technology requires that the load and the rotation speed fluctuation of an engine are within +/-5% during diagnosis, and the amplitude and the period of lambda oscillation are stable so as to obtain higher diagnosis reliability. This requirement is severe, and if the user is always driving under variable conditions, it is difficult to satisfy the diagnosis condition, resulting in failure to make an accurate diagnosis of the wide-area oxygen sensor.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide a method for diagnosing aging of a wide-range oxygen sensor, which can reduce the diagnosis condition of aging of the wide-range oxygen sensor and improve the accuracy of the diagnosis result.
A second object of the present invention is to provide a wide-range oxygen sensor degradation diagnosis apparatus.
A third object of the invention is to propose a computer-readable storage medium.
A fourth object of the invention is to propose a vehicle.
In order to achieve the above object, a method for diagnosing aging of a wide-range oxygen sensor is provided in an embodiment of a first aspect of the present invention, wherein the method includes the following steps: acquiring the running working condition of a vehicle, and judging whether the vehicle meets the aging diagnosis condition of entering a wide-range oxygen sensor according to the running working condition; if the vehicle meets the aging diagnosis condition of the wide-range oxygen sensor, acquiring the pump current of the wide-range oxygen sensor; acquiring an air-fuel ratio according to the pump current; recording the time taken by the air-fuel ratio to increase from a first preset value to a second preset value as a first time, and recording the time taken by the air-fuel ratio to decrease from the second preset value to the first preset value as a second time; and judging whether the wide-area oxygen sensor has aging faults or not according to the first time and the second time.
The method comprises the steps of firstly judging whether a vehicle meets an aging diagnosis condition of entering a wide-range oxygen sensor according to the running condition of the vehicle, obtaining the pump current of the wide-range oxygen sensor after the vehicle meets the condition, then obtaining the air-fuel ratio according to the pump current, recording the time of increasing the air-fuel ratio from a first preset value to a second preset value and recording the time as first time, recording the time of decreasing the air-fuel ratio from the second preset value to the first preset value and recording the time as second time, and finally judging whether the aging fault exists in the wide-range oxygen sensor according to the first time and the second time. Therefore, the method can reduce the diagnosis condition of the aging of the wide-range oxygen sensor and improve the accuracy of the diagnosis result.
In some examples of the invention, the vehicle is determined to satisfy the entry wide-area oxygen sensor degradation diagnosis condition when the following conditions are all satisfied: the temperature of the water of the engine of the vehicle is higher than a first preset temperature, the atmospheric pressure of the environment where the vehicle is located is higher than a first preset pressure, the running time of the engine is longer than a first preset time, the engine control system of the vehicle enters oxygen closed-loop feedback control, and the vehicle enters a deceleration fuel cut-off state.
In some examples of the present invention, the determining whether the wide area oxygen sensor has the aging fault according to the first time and the second time includes: comparing the relation between the first time and a first preset time; if the first time is greater than the first preset time, comparing the relationship between the second time and second preset time; and if the first time is less than or equal to the first preset time, incrementing a diagnostic count value; if the second time is greater than the second preset time, adding one to an aging count value and adding one to the diagnosis count value; and if the second time is less than or equal to the second preset time, incrementing the diagnostic count value by one; and judging whether the wide-range oxygen sensor has aging faults or not according to the aging count value and the diagnosis count value.
In some examples of the present invention, the determining whether the wide area oxygen sensor has the aging fault according to the aging count value and the diagnosis count value includes: comparing the relationship between the aging count value and a third preset value, and comparing the relationship between the diagnosis count value and a fourth preset value; if the aging count value is greater than or equal to the third preset value, or the diagnostic count value is greater than or equal to the fourth preset value, determining that an aging fault exists in the wide-area oxygen sensor when the aging count value is greater than or equal to the third preset value, and determining that an aging fault does not exist in the wide-area oxygen sensor when the aging count value is less than the third preset value; and if the aging count value is smaller than the third preset value and the diagnosis count value is smaller than the fourth preset value, returning to the step of judging whether the vehicle meets the aging diagnosis condition of the wide-range oxygen sensor.
In some examples of the invention, when the first time is obtained, the obtaining of the pump current of the wide-range oxygen sensor is stopped, and the obtaining of the pump current of the wide-range oxygen sensor is started again when the vehicle resumes the fuel supply.
In some examples of the invention, it is determined that the vehicle resumes fueling when any one of the following conditions is satisfied: the depth of an accelerator pedal of the vehicle is greater than a preset depth; the depth of the accelerator pedal is smaller than or equal to the preset depth, and any one of the rotating speed of the engine which is smaller than the rotating speed threshold value, the water temperature of the engine which is smaller than the water temperature threshold value and the vehicle speed of the vehicle which is smaller than the vehicle speed threshold value is satisfied.
In some examples of the invention, the method further comprises: and when the wide-range oxygen sensor has aging faults, sending out prompt information through a combination meter of the vehicle so as to prompt faults.
In order to achieve the above object, a second aspect of the present invention provides a wide-range oxygen sensor aging diagnosis apparatus, wherein the apparatus includes a first obtaining module, configured to obtain an operating condition of a vehicle; the first judgment module is used for judging whether the vehicle meets the aging diagnosis condition of the wide-range oxygen sensor according to the operation working condition; the second acquisition module is used for acquiring the pump current of the wide-range oxygen sensor when the vehicle meets the condition of entering the wide-range oxygen sensor aging diagnosis; the third acquisition module is used for acquiring an air-fuel ratio according to the pump current; the recording module is used for recording the time for increasing the air-fuel ratio from a first preset value to a second preset value as first time, and recording the time for decreasing the air-fuel ratio from the second preset value to the first preset value as second time when the vehicle is returned to be supplied with fuel; and the second judging module is used for judging whether the wide-area oxygen sensor has aging faults or not according to the first time and the second time.
The aging diagnosis device for the wide-area oxygen sensor comprises a first acquisition module, a first judgment module, a second acquisition module, a third acquisition module, a recording module and a second judgment module. The method comprises the steps of firstly obtaining the running working condition of a vehicle through a first obtaining module, then judging whether the vehicle meets the condition of entering the wide-area oxygen sensor aging diagnosis through a first judging module according to the running working condition, obtaining the pump current of the wide-area oxygen sensor through a second obtaining module when the vehicle meets the condition of entering the wide-area oxygen sensor aging diagnosis, obtaining the air-fuel ratio through a third obtaining module according to the pump current, respectively recording the time of increasing the air-fuel ratio from a first preset value to a second preset value through a recording module and recording the time as first time, recording the time of reducing the air-fuel ratio from the second preset value to the first preset value as second time, and finally judging whether the wide-area oxygen sensor has the aging fault through the second judging module according to the first time and the second time. Therefore, the device can reduce the diagnosis condition of the aging of the wide-range oxygen sensor and improve the accuracy of the diagnosis result.
To achieve the above object, a third aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the method for diagnosing aging of a wide-area oxygen sensor as described in the above embodiments.
The computer-readable storage medium of the embodiment of the present invention may implement the method for diagnosing aging of a wide-area oxygen sensor described in the above-described embodiment by executing the computer program stored thereon, thereby being capable of reducing the diagnosis condition of aging of the wide-area oxygen sensor and improving the accuracy of the diagnosis result.
To achieve the above object, a fourth aspect embodiment of the invention proposes a vehicle that includes the wide-range oxygen sensor degradation diagnosis apparatus in the above embodiment.
According to the vehicle provided by the embodiment of the invention, through the aging diagnosis device for the wide-range oxygen sensor, the diagnosis condition of the aging of the wide-range oxygen sensor of the vehicle can be reduced, and the accuracy of the diagnosis result is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a flow diagram of a wide area oxygen sensor aging diagnostic method of one embodiment of the present invention;
FIG. 2 is a flow diagram of a wide area oxygen sensor aging diagnostic method in accordance with one embodiment of the present invention;
FIG. 3 is a block diagram of the configuration of a wide-area oxygen sensor degradation diagnosis apparatus according to an embodiment of the present invention;
FIG. 4 is a block diagram of a vehicle according to an embodiment of the invention;
FIG. 5 is a signal diagram of an aged broad-band oxygen signal versus a theoretical broad-band oxygen signal.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The wide-range oxygen sensor aging diagnosis method and apparatus, the readable storage medium, and the vehicle according to the embodiment of the invention will be described with reference to fig. 1 to 5.
First, as shown in fig. 5, curve 1 is a typical signal waveform of the wide-range oxygen sensor after aging, and curve 2 is a theoretical signal waveform of the wide-range oxygen sensor, it is seen that the signal response of the wide-range oxygen sensor after aging is slow, the frequency is slow, and the period is long. Based on this, the embodiment of the present invention determines the aging condition of the wide-range oxygen sensor by the time when the wide-range oxygen signal jumps from the vicinity of the first preset value to the second preset value when the engine is out of fuel and the time when the wide-range oxygen jumps from the second preset value to the first preset value when the fuel supply is resumed, as follows.
FIG. 1 is a flow chart of a wide area oxygen sensor aging diagnostic method of one embodiment of the present invention.
In this embodiment, as shown in fig. 1, the method for diagnosing aging of a wide-area oxygen sensor includes the steps of:
and S10, acquiring the running condition of the vehicle, and judging whether the vehicle meets the aging diagnosis condition of the wide-range oxygen sensor according to the running condition.
Specifically, there are many factors that affect the wide-area oxygen sensor, such as the moving state of the vehicle, the environment in which the vehicle is located, and the like. In some examples, the vehicle is determined to satisfy the entry wide-area oxygen sensor degradation diagnostic condition when both of the following conditions are satisfied:
in condition 1, the engine water temperature of the vehicle is greater than a first preset temperature. As can be appreciated, the engine water temperature is correlated with the air-fuel ratio value of the wide-range oxygen, so it is possible to determine whether the vehicle satisfies the condition for entering the wide-range oxygen sensor degradation diagnosis by detecting the engine water temperature of the vehicle. For example, when the engine operates normally, the water temperature of the engine is 70-105 ℃, the first preset temperature may be set to 70 ℃, and when the water temperature of the engine is lower than 70 ℃, in order to ensure stable combustion of the air-fuel mixture in the cylinder, the air-fuel ratio may be increased, so that when the water temperature of the engine is lower, the combustion of the air-fuel mixture is unstable, and the air-fuel ratio is likely to fluctuate. Therefore, in order to improve the accuracy of the aging diagnosis result of the wide-range oxygen sensor, the wide-range oxygen sensor can be controlled to enter the aging diagnosis when the engine water temperature of the vehicle is higher than the first preset temperature.
In condition 2, the atmospheric pressure of the environment in which the vehicle is located is greater than the first preset pressure. That is, entering the wide-area oxygen sensor degradation diagnosis by the vehicle requires the atmospheric pressure of the environment in which the vehicle is located to be greater than a first preset pressure, wherein the first preset pressure may be selected differently according to different wide-area oxygen sensors, and optionally, the first preset pressure is 760 hPa. Alternatively, the atmospheric pressure may be converted by the altitude, for example, 760hPa corresponds to an altitude of 2440m, that is, the altitude of the environment in which the vehicle enters the wide-range oxygen sensor aging diagnosis is less than 2440 m.
And 3, the running time of the engine is greater than the first preset time. It can be understood that the temperature of the engine can be indirectly obtained through comparison of the running time of the engine, so that the oil temperature of the engine can be controlled to be at a proper temperature, and other related parts can also reach a proper temperature so as to meet the condition of the aging diagnosis of the vehicle entering the wide-range oxygen sensor. In addition, when the vehicle is a pure fuel type, the oil temperature of the engine and the temperatures of the respective components may be obtained by detecting the operation time of the engine, and when the vehicle is an oil-electric hybrid type, the oil temperature of the engine may be detected. It is understood that the oil temperature of the engine can be directly detected by arranging a temperature sensor. Optionally, the first preset time is 400 seconds.
Condition 4, the engine control system of the vehicle enters oxygen closed-loop feedback control. It should be noted that, before the wide-range oxygen sensor ages, the engine control system of the vehicle enters the oxygen closed-loop feedback control, so when determining whether the vehicle meets the condition for entering the wide-range oxygen sensor aging diagnosis, it is necessary to first determine whether the engine control system of the vehicle enters the oxygen closed-loop feedback control.
Condition 5, the vehicle enters a deceleration fuel cut-off state. Optionally, the engine control system may send information of a deceleration fuel cut-off flag bit, and when the deceleration fuel cut-off flag bit of the vehicle is effective, the vehicle is controlled to enter a deceleration fuel cut-off state.
Of course, when determining whether the vehicle meets the aging diagnosis condition of the wide-area oxygen sensor, it is necessary to determine that there is no fault in the parameters of the vehicle components and systems, including the system voltage, the cooling water temperature sensor, the fuel injection system, the ignition system, the intake pressure sensor, the boost pressure sensor, the camshaft position sensor, the crankshaft position sensor, the electronic throttle body, etc. In addition, the wide-area oxygen sensor degradation diagnostic condition further includes that the other oxygen sensors are prohibited from issuing diagnostic requests.
S20, if the vehicle meets the condition for entering the wide-range oxygen sensor aging diagnosis, acquiring the pump current of the wide-range oxygen sensor.
S30, the air-fuel ratio is obtained based on the pump current.
Specifically, after the vehicle is judged to meet the aging diagnosis condition of the wide-range oxygen sensor, the pump current of the wide-range oxygen sensor is acquired. It should be noted that there is a mapping relationship between the pump current and the air-fuel ratio, and the air-fuel ratio can be obtained by the value of the pump current. Alternatively, the mapping relationship between the pump current and the air-fuel ratio may be tested in advance, and stored in a map table, and after the pump current of the wide-range oxygen sensor is obtained, the map table is queried by the pump current to obtain the air-fuel ratio.
S40, the time taken for the air-fuel ratio to increase from the first preset value to the second preset value is recorded as a first time, and the time taken for the air-fuel ratio to decrease from the second preset value to the first preset value is recorded as a second time.
Specifically, after the air-fuel ratio is obtained, the air-fuel ratio is compared with a first preset value and a second preset value, the time for increasing the air-fuel ratio from the first preset value to the second preset value is recorded and recorded as a first time; the time taken for the air-fuel ratio to decrease from the second preset value to the first preset value is recorded and recorded as a second time. It should be noted that the first preset value and the second preset value may be defined according to the driving habits of the user or the type of the wide-range oxygen sensor, and taking the driving habits of the user as an example, the first preset value is an air-fuel ratio of the user when the user drives at a low speed which is frequently used, and the second preset value is an air-fuel ratio of the user when the user drives at a high speed which is frequently used. For example, the first preset value is 1.3, the second preset value is 2.4; in another example, the first predetermined value is 1.0 and the second predetermined value is 2.5.
In some examples of the invention, the obtaining of the pump current of the wide-area oxygen sensor is stopped when the first time is obtained, and the obtaining of the pump current of the wide-area oxygen sensor is restarted when the vehicle resumes the fuel supply.
Optionally, the first time and the second time are obtained by timing with a timer. And after the first time is obtained, stopping obtaining the pump current of the wide-range oxygen sensor, and when the vehicle resumes fuel supply, restarting obtaining the pump current of the wide-range oxygen sensor. In this example, the vehicle is required to resume fueling that satisfies one of the following conditions: firstly, the depth of an accelerator pedal of the vehicle is greater than a preset depth, namely, when a driver performs an acceleration action, the vehicle can recover oil supply; secondly, if the driver does not perform the acceleration action, but the rotating speed of the engine is smaller than the rotating speed threshold value, or the water temperature of the engine is smaller than the water temperature threshold value, or the vehicle speed of the vehicle is smaller than the vehicle speed threshold value, the vehicle can recover the oil supply, and at the moment, the engine control system can receive the oil supply recovery command. When the engine control system receives an instruction of recovering oil supply, the pump current of the wide-range oxygen sensor is obtained, the pump current is used for inquiring a map table to obtain the air-fuel ratio, when the air-fuel ratio reaches a second preset value, a timer starts timing, and stops timing until the air-fuel ratio reaches a first preset value, and the time is recorded as second time.
And S50, judging whether the wide-area oxygen sensor has aging faults or not according to the first time and the second time.
Specifically, the relationship between the first time and the first preset time is compared, and if the first time is greater than the first preset time, the relationship between the second time and the second preset time is compared; if the first time is less than or equal to the first preset time, the diagnostic count value is incremented by one. In the comparison between the second time and the second preset time, if the second time is greater than the second preset time, adding one to the aging count value and adding one to the diagnostic count value; and if the second time is less than or equal to a second preset time, incrementing the diagnostic count value by one. And finally, judging whether the wide-range oxygen sensor has aging faults or not according to the aging count value and the diagnosis count value.
It should be noted that the first preset time and the second preset time may be calibrated according to different vehicle types, for example, the calibration method includes: and accessing a wire oxygen aging simulation device, setting an aging program to be 800ms, fixing each gear to enter the sliding deceleration fuel cut at different speeds, and measuring the time for increasing the air-fuel ratio from a first preset value to a second preset value and the time for reducing the air-fuel ratio from the second preset value to the first preset value after the fuel cut and when the fuel supply is recovered as a first preset time and a second preset time respectively.
In some examples of the invention, the diagnostic count value and the aging count value are obtained after comparing the first time and the second time, and whether the wide-area oxygen sensor has the aging fault is judged according to the aging count value and the diagnostic count value.
Specifically, the relationship between the aging count value and a third preset value is compared, the relationship between the diagnostic count value and a fourth preset value is compared, if the aging count value is greater than or equal to the third preset value, or the diagnostic count value is greater than or equal to the fourth preset value, when the aging count value is greater than or equal to the third preset value, it is determined that the wide-area oxygen sensor has an aging fault, and when the aging count value is less than the third preset value, it is determined that the wide-area oxygen sensor does not have an aging fault; and if the aging count value is smaller than the third preset value and the diagnosis count value is smaller than the fourth preset value, returning to the step of judging whether the vehicle meets the aging diagnosis condition of the wide-range oxygen sensor.
Optionally, when the wide-area oxygen sensor has an aging fault, a prompt message can be sent out through a combination meter of the vehicle to prompt the fault.
As one specific example, as shown in FIG. 2, it is first determined whether the vehicle meets an entering wide-area oxygen sensor degradation diagnostic condition, and if so, a first time for the air-fuel ratio to increase from a first preset value to a second preset value is recorded, wherein the first preset value and the second preset value can be measured by a pump current of the wide-area oxygen sensor (not shown). After the first time is measured, comparing the magnitude between the first time and a first preset time, and if the first time is less than or equal to the first preset time, adding one to the diagnosis count value; if the first time is greater than the first preset time, a second time is recorded for the air-fuel ratio to decrease from the second preset value to the first preset value. After the second time is measured, comparing the magnitude between the second time and a second preset time, and if the second time is less than or equal to the second preset time, adding one to the diagnosis count value; if the second time is greater than the second preset time, the aging count value and the diagnostic count value are both incremented by one. Judging the diagnosis count value and the aging technical value after obtaining the diagnosis count value and the aging count value, and if the aging count value is smaller than a third preset value and the diagnosis count value is smaller than a fourth preset value, judging whether the vehicle meets the aging diagnosis condition of entering the wide-area oxygen sensor again; if the aging count value is greater than or equal to the third preset value or the diagnosis count value is greater than or equal to the fourth preset value, further judging whether the aging count value is greater than or equal to the third preset value or not, if so, judging that the wide-range oxygen sensor has an aging fault, and simultaneously controlling the vehicle to send prompt information; and if not, judging that the wide-area oxygen sensor has no aging fault.
In summary, the aging diagnosis method for the wide-area oxygen sensor of the embodiment of the invention can reduce the aging diagnosis condition of the wide-area oxygen sensor and improve the accuracy of the diagnosis result.
Further, the present invention proposes a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the wide-area oxygen sensor aging diagnosis method in the above-described embodiments.
The computer-readable storage medium of the embodiment of the present invention, on which the computer program corresponding to the above-described data encryption storage method is stored, is executed by the processor, can reduce the diagnosis condition of the aging of the wide-area oxygen sensor while improving the accuracy of the diagnosis result.
Fig. 3 is a block diagram showing the configuration of the wide-range oxygen sensor degradation diagnosis apparatus according to the embodiment of the present invention.
As shown in fig. 3, the wide-area oxygen sensor aging diagnosis apparatus 100 includes a first acquisition module 101, a first determination module 102, a second acquisition module 103, a third acquisition module 104, a recording module 105, and a second determination module 106.
The first obtaining module 101 is used for obtaining the running condition of the vehicle; the first judging module 102 is used for judging whether the vehicle meets the aging diagnosis condition of the wide-range oxygen sensor according to the operation condition; the second obtaining module 103 is used for obtaining the pump current of the wide-range oxygen sensor when the vehicle meets the condition of entering the aging diagnosis of the wide-range oxygen sensor; the third obtaining module 104 is used for obtaining the air-fuel ratio according to the pump current; the recording module 105 is used for recording the time taken by the air-fuel ratio to increase from a first preset value to a second preset value as a first time, and recording the time taken by the air-fuel ratio to decrease from the second preset value to the first preset value when the vehicle is returned to be supplied with fuel as a second time; the second judging module 106 is configured to judge whether the wide-area oxygen sensor has an aging fault according to the first time and the second time.
Specifically, there are many factors that affect the wide-area oxygen sensor, such as the moving state of the vehicle, the environment in which the vehicle is located, and the like. In this embodiment, the first obtaining module 101 obtains the operating condition of the vehicle, and then the first determining module 102 determines whether the vehicle meets the condition for entering the wide-range oxygen sensor aging diagnosis. It should be noted that when determining whether the vehicle meets the aging diagnosis condition of the wide-range oxygen sensor, it is also necessary to determine that there is no fault in the component parameters and system parameters of the vehicle, including the system voltage, the cooling water temperature sensor, the fuel injection system, the ignition system, the intake pressure sensor, the boost pressure sensor, the camshaft position sensor, the crankshaft position sensor, the electronic throttle body, etc.
In addition, the wide-area oxygen sensor degradation diagnostic condition further includes that the other oxygen sensors are prohibited from issuing diagnostic requests. After the first judging module 102 judges that the vehicle meets the condition for entering the wide-area oxygen sensor aging diagnosis, the second obtaining module 103 is used for obtaining the pump current of the wide-area oxygen sensor. It should be noted that there is a mapping relationship between the pump current and the air-fuel ratio, and the air-fuel ratio can be obtained by the value of the pump current. After the second obtaining module 103 obtains the pump current, the air-fuel ratio is obtained through the third obtaining module 104.
Alternatively, the mapping relationship between the pump current and the air-fuel ratio may be stored in a map table, and after the pump current of the wide-range oxygen sensor is obtained, the air-fuel ratio is obtained by querying the map table through the pump current. After the third obtaining module 104 obtains the air-fuel ratio, the air-fuel ratio is compared with the first preset value and the second preset value, and the time for increasing the air-fuel ratio from the first preset value to the second preset value is recorded by the recording module 105 and recorded as the first time; the time taken for the air-fuel ratio to decrease from the second preset value to the first preset value is recorded and recorded as a second time.
It should be noted that the first preset value and the second preset value may be defined according to the driving habits of the user or the type of the wide-range oxygen sensor, and taking the driving habits of the user as an example, the first preset value is an air-fuel ratio of the user when the user drives at a low speed which is frequently used, and the second preset value is an air-fuel ratio of the user when the user drives at a high speed which is frequently used. In this example, the first preset value is 1.3 and the second preset value is 2.4. And finally, the second judging module 106 is used for judging whether the wide-area oxygen sensor has the aging fault according to the first time and the second time.
In some examples of the invention, the first determination module 102 determines that the vehicle satisfies the ingress Wide area oxygen sensor degradation diagnostic condition when both of the following conditions are satisfied: the temperature of the water of the engine of the vehicle is higher than a first preset temperature, the atmospheric pressure of the environment where the vehicle is located is higher than a first preset pressure, the running time of the engine is longer than a first preset time, the engine control system of the vehicle enters oxygen closed-loop feedback control, and the vehicle enters a deceleration fuel cut-off state.
In some examples of the invention, the second determining module 106 determining whether the wide area oxygen sensor has the aging fault according to the first time and the second time includes: comparing the relation between the first time and a first preset time; if the first time is greater than the first preset time, comparing the relationship between the second time and the second preset time; and if the first time is less than or equal to a first preset time, incrementing a diagnostic count value; if the second time is longer than the second preset time, adding one to the aging count value, and adding one to the diagnosis count value; and if the second time is less than or equal to a second preset time, incrementing a diagnostic count value; and judging whether the wide-range oxygen sensor has aging faults or not according to the aging count value and the diagnosis count value.
In some examples of the invention, determining whether the wide area oxygen sensor has the age fault based on the age count value and the diagnostic count value includes: comparing the relationship between the aging count value and the third preset value, and comparing the relationship between the diagnosis count value and the fourth preset value; if the aging count value is greater than or equal to the third preset value, or the diagnosis count value is greater than or equal to the fourth preset value, judging that the wide-area oxygen sensor has an aging fault when the aging count value is greater than or equal to the third preset value, and judging that the wide-area oxygen sensor does not have the aging fault when the aging count value is less than the third preset value; and if the aging count value is smaller than the third preset value and the diagnosis count value is smaller than the fourth preset value, returning to the step of judging whether the vehicle meets the aging diagnosis condition of the wide-range oxygen sensor.
In some examples of the invention, the acquisition of the pump current of the wide-area oxygen sensor is stopped when the recording module 105 records that the first time is obtained, and the acquisition of the pump current of the wide-area oxygen sensor is restarted when the vehicle resumes fueling.
In some examples of the invention, it is determined that the vehicle resumes fueling when any one of the following conditions is satisfied: the depth of an accelerator pedal of the vehicle is greater than the preset depth; the depth of the accelerator pedal is less than or equal to the preset depth, and any one of the rotating speed of the engine which is less than the rotating speed threshold value, the water temperature of the engine which is less than the water temperature threshold value and the vehicle speed of the vehicle which is less than the vehicle speed threshold value is satisfied.
In some examples of the invention, when the wide-area oxygen sensor has an aging fault, a warning message is sent by a combination meter of the vehicle to give a fault warning.
For another specific implementation method of the aging diagnosis apparatus for a wide-range oxygen sensor according to the embodiment of the present invention, reference may be made to the specific implementation method of the aging diagnosis apparatus for a wide-range oxygen sensor according to the above-described embodiment of the present invention.
In summary, the aging diagnosis device for the wide-range oxygen sensor according to the embodiment of the invention can reduce the aging diagnosis condition of the wide-range oxygen sensor and improve the accuracy of the diagnosis result.
Fig. 4 is a block diagram of the structure of the vehicle of the embodiment of the invention.
Further, as shown in fig. 4, the present invention proposes a vehicle 1000, and the vehicle 1000 includes the wide-range oxygen sensor degradation diagnosis apparatus 100 in the above-described embodiment.
According to the vehicle provided by the embodiment of the invention, through the aging diagnosis device for the wide-range oxygen sensor in the embodiment, the diagnosis condition of the aging of the wide-range oxygen sensor can be reduced, and meanwhile, the accuracy of the diagnosis result is improved.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A method for diagnosing aging of a wide-area oxygen sensor is characterized by comprising the following steps:
acquiring the running working condition of a vehicle, and judging whether the vehicle meets the aging diagnosis condition of entering a wide-range oxygen sensor according to the running working condition;
if the vehicle meets the aging diagnosis condition of the wide-range oxygen sensor, acquiring the pump current of the wide-range oxygen sensor;
acquiring an air-fuel ratio according to the pump current;
recording the time taken by the air-fuel ratio to increase from a first preset value to a second preset value as a first time, and recording the time taken by the air-fuel ratio to decrease from the second preset value to the first preset value as a second time;
and judging whether the wide-area oxygen sensor has aging faults or not according to the first time and the second time.
2. The wide-area oxygen sensor degradation diagnostic method of claim 1, wherein the vehicle is determined to satisfy the entry wide-area oxygen sensor degradation diagnostic condition when both of the following conditions are satisfied:
the temperature of the water of the engine of the vehicle is higher than a first preset temperature, the atmospheric pressure of the environment where the vehicle is located is higher than a first preset pressure, the running time of the engine is longer than a first preset time, the engine control system of the vehicle enters oxygen closed-loop feedback control, and the vehicle enters a deceleration fuel cut-off state.
3. The wide-area oxygen sensor degradation diagnostic method of claim 1, wherein said determining whether the degradation fault exists for the wide-area oxygen sensor based on the first time and the second time comprises:
comparing the relation between the first time and a first preset time;
if the first time is greater than the first preset time, comparing the relationship between the second time and second preset time; and if the first time is less than or equal to the first preset time, incrementing a diagnostic count value;
if the second time is greater than the second preset time, adding one to an aging count value and adding one to the diagnosis count value; and if the second time is less than or equal to the second preset time, incrementing the diagnostic count value by one;
and judging whether the wide-range oxygen sensor has aging faults or not according to the aging count value and the diagnosis count value.
4. The wide area oxygen sensor degradation diagnostic method of claim 3, wherein said determining whether the wide area oxygen sensor has a degradation fault based on the degradation count value and the diagnostic count value comprises:
comparing the relationship between the aging count value and a third preset value, and comparing the relationship between the diagnosis count value and a fourth preset value;
if the aging count value is greater than or equal to the third preset value, or the diagnostic count value is greater than or equal to the fourth preset value, determining that an aging fault exists in the wide-area oxygen sensor when the aging count value is greater than or equal to the third preset value, and determining that an aging fault does not exist in the wide-area oxygen sensor when the aging count value is less than the third preset value;
and if the aging count value is smaller than the third preset value and the diagnosis count value is smaller than the fourth preset value, returning to the step of judging whether the vehicle meets the aging diagnosis condition of the wide-range oxygen sensor.
5. The wide-range oxygen sensor degradation diagnostic method of claim 1, wherein when the first time is obtained, obtaining the pump current of the wide-range oxygen sensor is stopped, and when the vehicle resumes fueling, obtaining the pump current of the wide-range oxygen sensor is restarted.
6. The wide-range oxygen sensor degradation diagnostic method according to claim 5, wherein it is determined that the vehicle resumes fueling when any one of the following conditions is satisfied:
the depth of an accelerator pedal of the vehicle is greater than a preset depth;
the depth of the accelerator pedal is smaller than or equal to the preset depth, and any one of the rotating speed of the engine which is smaller than the rotating speed threshold value, the water temperature of the engine which is smaller than the water temperature threshold value and the vehicle speed of the vehicle which is smaller than the vehicle speed threshold value is satisfied.
7. The wide area oxygen sensor degradation diagnostic method of claim 1, further comprising:
and when the wide-range oxygen sensor has aging faults, sending out prompt information through a combination meter of the vehicle so as to prompt faults.
8. A wide-area oxygen sensor degradation diagnostic device, comprising:
the first acquisition module is used for acquiring the running working condition of the vehicle;
the first judgment module is used for judging whether the vehicle meets the aging diagnosis condition of the wide-range oxygen sensor according to the operation working condition;
the second acquisition module is used for acquiring the pump current of the wide-range oxygen sensor when the vehicle meets the condition of entering the wide-range oxygen sensor aging diagnosis;
the third acquisition module is used for acquiring an air-fuel ratio according to the pump current;
the recording module is used for recording the time for increasing the air-fuel ratio from a first preset value to a second preset value as first time, and recording the time for decreasing the air-fuel ratio from the second preset value to the first preset value as second time when the vehicle is returned to be supplied with fuel;
and the second judging module is used for judging whether the wide-area oxygen sensor has aging faults or not according to the first time and the second time.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a wide-area oxygen sensor aging diagnostic method according to any one of claims 1 to 6.
10. A vehicle, characterized by comprising: the wide area oxygen sensor degradation diagnostic device of claim 8.
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| CN202010605003.3A CN113931758A (en) | 2020-06-29 | 2020-06-29 | Wide-range oxygen sensor aging diagnosis method and device, readable storage medium and vehicle |
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