CN113602253B - Method and device for diagnosing responsiveness of front oxygen sensor of hybrid vehicle - Google Patents
Method and device for diagnosing responsiveness of front oxygen sensor of hybrid vehicle Download PDFInfo
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- CN113602253B CN113602253B CN202110724305.7A CN202110724305A CN113602253B CN 113602253 B CN113602253 B CN 113602253B CN 202110724305 A CN202110724305 A CN 202110724305A CN 113602253 B CN113602253 B CN 113602253B
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 158
- 239000001301 oxygen Substances 0.000 title claims abstract description 158
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 158
- 230000004043 responsiveness Effects 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000004044 response Effects 0.000 claims abstract description 87
- 239000000446 fuel Substances 0.000 claims abstract description 74
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 238000005259 measurement Methods 0.000 claims abstract description 31
- 230000008569 process Effects 0.000 claims abstract description 13
- 230000003247 decreasing effect Effects 0.000 claims abstract description 4
- 238000010248 power generation Methods 0.000 claims description 27
- 238000002405 diagnostic procedure Methods 0.000 claims description 15
- 238000004590 computer program Methods 0.000 claims description 10
- 238000003745 diagnosis Methods 0.000 abstract description 77
- 230000009467 reduction Effects 0.000 description 8
- 239000007789 gas Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
- B60W20/15—Control strategies specially adapted for achieving a particular effect
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/02—Ensuring safety in case of control system failures, e.g. by diagnosing, circumventing or fixing failures
- B60W50/0205—Diagnosing or detecting failures; Failure detection models
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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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Human Computer Interaction (AREA)
- Hybrid Electric Vehicles (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The embodiment of the application provides a front oxygen sensor responsiveness diagnosis method and device of a hybrid vehicle, wherein the front oxygen sensor responsiveness diagnosis method of the hybrid vehicle comprises the following steps: responding to the responsive diagnostic information in the case of an engine direct drive vehicle; controlling a starting and generating integrated machine of a hybrid power vehicle to strongly drag the engine so as to enable the hybrid power vehicle to be in a deceleration and fuel cut-off state; under the condition that the hybrid vehicle is in a deceleration fuel cut-off state, acquiring the actual measurement response rate and the air-fuel ratio of a front oxygen sensor; and under the condition that the air-fuel ratio is in a decreasing trend in the detection process, taking the actual measurement response rate of the front oxygen sensor as a front oxygen sensor response rate diagnostic value. The front oxygen sensor responsiveness diagnosis method of the hybrid vehicle can improve the diagnosis completion rate.
Description
Technical Field
The present application relates to the field of vehicle technologies, and more particularly, to a front oxygen sensor responsiveness diagnosis method of a hybrid vehicle and a front oxygen sensor responsiveness diagnosis device of a hybrid vehicle.
Background
With the gradual increase of the automobile conservation amount, the fuel consumption and emission regulations are increasingly severe, and the national energy safety faces a great threat. The average fuel consumption (CAFC value) of the enterprises of the national standard passenger cars will drop to 5 liters/hundred kilometers in 2020 and further to 4 liters/hundred kilometers in 2025. While the traditional fuel vehicle cannot meet such strict requirements under the prior art condition, the hybrid electric vehicle combines the respective advantages of the pure fuel vehicle and the electric vehicle, and gradually becomes the current mainstream scheme.
However, unlike a purely fueled vehicle, which is operated in a reverse-reverse mode in EV-series-parallel mode, the front oxygen sensor rationality diagnostic must be performed during engine deceleration fuel cut-off and acceleration enrichment conditions. Whereas the hybrid vehicle is not operated in the pure mode as well as in the series mode. Therefore, compared with the traditional fuel vehicle, the traditional fuel vehicle diagnosis method for the hybrid electric vehicle cannot be fully applied to the hybrid electric vehicle, the diagnosis working condition of the hybrid electric vehicle is reduced, the diagnosis failure rate is higher, and the requirement of regulations on the diagnosis completion rate (IUPR) cannot be met.
Disclosure of Invention
The present application aims to solve at least one of the technical problems existing in the prior art or related art.
In view of this, a first aspect according to an embodiment of the present application proposes a front oxygen sensor responsiveness diagnostic method of a hybrid vehicle, including:
responding to the responsive diagnostic information in the case of an engine direct drive vehicle;
controlling a starting and generating integrated machine of a hybrid power vehicle to strongly drag the engine so as to enable the hybrid power vehicle to be in a deceleration and fuel cut-off state;
under the condition that the hybrid vehicle is in a deceleration fuel cut-off state, acquiring the actual measurement response rate and the air-fuel ratio of a front oxygen sensor;
and under the condition that the air-fuel ratio is in a decreasing trend in the detection process, taking the actual measurement response rate of the front oxygen sensor as a front oxygen sensor response rate diagnostic value.
In a first possible implementation manner of the first aspect, the step of controlling the start-up and power-generation integrated machine to strongly drag the engine so as to place the hybrid vehicle in a deceleration fuel cut-off state includes:
controlling the starting and generating integrated machine to apply a force opposite to the steering of an output end of the engine to the engine so that the rotating speed of the engine is 400r/min to 2500r/min;
the starting and generating integrated machine strongly drags the engine for 1s to 3s.
In a second possible implementation manner of the first aspect, the step of acquiring the measured response rate and the air-fuel ratio of the front oxygen sensor when the hybrid vehicle is in a deceleration fuel cut state includes:
under the condition that the hybrid vehicle is in a deceleration fuel cut-off state and the voltage value of the front oxygen sensor is a first threshold value, acquiring the actual measurement response rate and the air-fuel ratio of the front oxygen sensor;
and stopping detection when the voltage value of the front oxygen sensor is a second threshold value.
In a third possible implementation manner of the first aspect, the value of the second threshold is smaller than the value of the first threshold, the first threshold is 0.5V to 0.7V, and the value of the second threshold is 0.2V to 0.4V.
In a fourth possible implementation manner of the first aspect, the method further includes:
in the case where the air-fuel ratio rises during detection, the detection is exited.
In a fifth possible implementation manner of the first aspect, the method further includes:
under the condition that the engine directly drives the vehicle, controlling the control start power generation integrated machine to strongly drag the engine for a plurality of times so as to obtain a plurality of front oxygen sensor response rate diagnostic values;
and obtaining an average value of a plurality of the front oxygen sensor response rate diagnostic values as the front oxygen sensor response diagnostic result.
In a sixth possible implementation manner of the first aspect, before the step of responding to the responsiveness diagnostic information in a case where the engine directly drives the vehicle, the method further includes:
receiving responsive diagnostic information;
and acquiring the working state of the hybrid vehicle under the condition that the front oxygen of the hybrid vehicle enters a closed loop.
In a seventh possible implementation manner of the first aspect, the step of obtaining an operating state of the hybrid vehicle includes:
acquiring state information of a clutch of the hybrid vehicle through an engine control unit;
and when the state information of the clutch is a connection state, the hybrid vehicle is in the engine direct-drive vehicle state.
In an eighth possible implementation manner of the first aspect, the method further includes:
in the case where the vehicle is not directly driven by the engine, the responsive diagnostic information is not responded.
According to a second aspect of the embodiment of the present application, there is provided a front oxygen sensor responsiveness diagnostic device of a hybrid vehicle including:
a memory storing a computer program;
a processor executing the computer program;
wherein the processor, when executing the computer program, implements the front oxygen sensor responsiveness diagnostic method of the hybrid vehicle of any one of the above-described aspects.
Compared with the prior art, the application at least comprises the following beneficial effects: according to the method for diagnosing the responsiveness of the front oxygen sensor of the hybrid vehicle, when the responsiveness of the front oxygen sensor is required to be diagnosed, under the condition that responsiveness diagnosis information is received, under the condition that an engine of the hybrid vehicle directly drives the vehicle, the engine is strongly towed by a starting and power generation integrated machine of the hybrid vehicle, so that the vehicle enters a speed reduction unit state, the actual measurement response rate of the front oxygen sensor and the air-fuel ratio are further detected in a speed reduction and fuel-cut state, the state of the vehicle can be monitored by measuring the air-fuel ratio, and the detected actual measurement response rate of the front oxygen sensor is used as a diagnosis value of the response rate of the front oxygen sensor under the condition that the air-fuel ratio is in a descending trend. According to the embodiment of the application, on one hand, the actually measured response rate of the front oxygen sensor is detected and obtained only under the condition that the engine directly drives the vehicle, so that the diagnosis completion rate can be improved, unnecessary detection is avoided, and the diagnosis efficiency is greatly improved; on the other hand, the engine can be strongly towed by the starting and power generation integrated machine, so that the hybrid vehicle is in a deceleration and fuel cut-off state, detection time is provided for the responsiveness diagnosis of the front oxygen sensor, and the diagnosis efficiency is further improved; in the process of detecting the actual measurement response rate of the front oxygen sensor, the air-fuel ratio is obtained at the same time, and the actual measurement response rate of the front oxygen sensor is used as the diagnosis value of the response rate of the front oxygen sensor only under the condition that the air-fuel ratio is in a descending trend, so that the accuracy and the safety of the response diagnosis of the front oxygen sensor can be greatly improved.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of steps of a method for diagnosing responsiveness of a front oxygen sensor of a hybrid vehicle according to one embodiment of the present application;
FIG. 2 is a schematic block diagram of a hybrid vehicle according to one embodiment of the present application;
FIG. 3 is a flow chart of steps of a method for diagnosing responsiveness of a front oxygen sensor of a hybrid vehicle according to one embodiment of the present application;
fig. 4 is a block diagram showing a structure of a front oxygen sensor responsiveness diagnostic device of a hybrid vehicle according to an embodiment of the present application.
The correspondence between the reference numerals and the component names in fig. 2 is:
1. an engine; 2. starting the power generation integrated machine; 3. a Motor; 4. a clutch.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present application can be understood in detail, a more particular description of the application, briefly summarized below, may be had by reference to the appended drawings. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited to the specific embodiments disclosed below.
As shown in fig. 1, a first aspect of an embodiment of the present application proposes a front oxygen sensor responsiveness diagnostic method of a hybrid vehicle, including:
step 101: in the case of an engine direct drive vehicle, responsive diagnostic information. As can be understood from fig. 2, the hybrid vehicle includes a clutch 4, an integrated starter-generator 2 (ISG Motor) and a Motor 3, the integrated starter-generator 2 being directly connected with the engine 1 for starting, generating and assisting; the engine 1 and the Motor 3 jointly output power, and a clutch 4 is arranged behind the engine 1 and used for switching modes; based on the hybrid electric vehicle, the hybrid electric vehicle can be switched between a pure electric-series-parallel mode, and in a pure electric state, the engine 1 and the starting and power generation integrated machine 2 do not work, and the power battery provides electric energy to the Motor 3 to drive the vehicle; in the series state, the clutch 4 is disengaged, the engine 1 is not involved in driving the vehicle, only the starting and power generation integrated machine 2 is driven to generate power, the Motor 3 is supplied to drive the vehicle, and redundant power generation is stored in the power battery; in the parallel state, the clutch 4 is engaged, the engine 1 directly drives the vehicle, and the Motor 3 is only responsible for the auxiliary power output under the limiting working condition. The embodiment of the application diagnoses the responsiveness of the front oxygen sensor only under the condition that the engine 1 directly drives the vehicle, can improve the diagnosis completion rate, avoids unnecessary detection and greatly improves the diagnosis efficiency.
Step 102: and controlling the starting and generating integrated machine of the hybrid power vehicle to strongly drag the engine so as to enable the hybrid power vehicle to be in a deceleration and oil-break state. The engine is strongly towed by the starting and power generation integrated machine of the hybrid power vehicle, so that the engine can simulate a speed-reducing and oil-cutting state, the hybrid power vehicle is in the speed-reducing and oil-cutting state, the diagnosis of the responsiveness of the front oxygen sensor is not required to depend on other equipment, the process of the vehicle gas mixture from rich to lean is simulated, and the strategy of the responsiveness diagnosis of the front oxygen sensor is beneficial to the implementation of the responsiveness diagnosis method of the front oxygen sensor.
Step 103: under the condition that the hybrid vehicle is in a deceleration fuel cut-off state, the actual measurement response rate and the air-fuel ratio of the front oxygen sensor are acquired. Under the condition that the vehicle is in a deceleration fuel cut-off state, the actual measurement response rate and the air-fuel ratio of the front oxygen sensor are obtained, and the state of the gas mixture can be monitored through the air-fuel ratio, so that the diagnosis completion rate can be improved.
Step 104: when the air-fuel ratio is in a decreasing trend during the detection, the measured response rate of the front oxygen sensor is used as the diagnosis value of the response rate of the front oxygen sensor. In the process of detecting the actual measurement response rate of the front oxygen sensor, the air-fuel ratio is obtained at the same time, and the actual measurement response rate of the front oxygen sensor is used as the diagnosis value of the response rate of the front oxygen sensor only under the condition that the air-fuel ratio is in a descending trend, so that the accuracy and the safety of the response diagnosis of the front oxygen sensor can be greatly improved.
According to the method for diagnosing the responsiveness of the front oxygen sensor of the hybrid vehicle, when the responsiveness of the front oxygen sensor is required to be diagnosed, under the condition that responsiveness diagnosis information is received, under the condition that an engine of the hybrid vehicle directly drives the vehicle, the engine is strongly towed by a starting and power generation integrated machine of the hybrid vehicle, so that the vehicle enters a speed reduction unit state, the actual measurement response rate of the front oxygen sensor and the air-fuel ratio are further detected in a speed reduction and fuel-cut state, the state of the vehicle can be monitored by measuring the air-fuel ratio, and the detected actual measurement response rate of the front oxygen sensor is used as a diagnosis value of the response rate of the front oxygen sensor under the condition that the air-fuel ratio is in a descending trend. According to the embodiment of the application, on one hand, the actually measured response rate of the front oxygen sensor is detected and obtained only under the condition that the engine directly drives the vehicle, so that the diagnosis completion rate can be improved, unnecessary detection is avoided, and the diagnosis efficiency is greatly improved; on the other hand, the engine can be strongly towed by the starting and power generation integrated machine, so that the hybrid vehicle is in a deceleration and fuel cut-off state, detection time is provided for the responsiveness diagnosis of the front oxygen sensor, and the diagnosis efficiency is further improved; in the process of detecting the actual measurement response rate of the front oxygen sensor, the air-fuel ratio is obtained at the same time, and the actual measurement response rate of the front oxygen sensor is used as the diagnosis value of the response rate of the front oxygen sensor only under the condition that the air-fuel ratio is in a descending trend, so that the accuracy and the safety of the response diagnosis of the front oxygen sensor can be greatly improved.
In some examples, the step of controlling the start-up power generation integrated machine to strongly drag the engine to place the hybrid vehicle in a deceleration fuel cut-off state includes: the starting and generating integrated machine is controlled to apply a force opposite to the rotation direction of the output end of the engine to the engine, so that the rotation speed of the engine is 400r/min to 2500r/min.
The vehicle is in a deceleration fuel cut-off state by the start-up and power-generation integrated machine applying a force to the engine opposite to the direction of the engine output end. The rotation speed of the engine is 400-2500 r/min, so that the running speed of the vehicle is 80-120 KM/h, a good detection environment is provided for the front oxygen sensor responsiveness diagnosis method, and it is understood that if the rotation speed of the engine is 400-2500 r/min in the process of acquiring the actual measurement response speed of the front oxygen sensor, the diagnosis should be exited.
In some examples, the duration of the engine of the power generation and start integrated machine is 1s to 3s.
In consideration of the fact that small-scale shaking of the vehicle possibly occurs in the process of performing the front oxygen sensor responsiveness diagnosis, driving feeling is affected, and meanwhile, in order to reduce energy waste, the duration of the engine is drawn by a strong tractor for 1s to 3s for protection and economical purposes, and user experience can be improved.
In some examples, the step of obtaining the front oxygen sensor measured response rate and the air-fuel ratio in a case where the hybrid vehicle is in a deceleration fuel cut state includes: under the condition that the hybrid vehicle is in a deceleration fuel cut-off state and the voltage value of the front oxygen sensor is a first threshold value, acquiring the actually measured response rate and the air-fuel ratio of the front oxygen sensor; in the case where the voltage value of the front oxygen sensor is the second threshold value, the detection is stopped.
The acquisition time of the actually measured response rate of the front oxygen sensor is limited by selecting the first threshold value and the second threshold value, and the responsiveness diagnosis duration of the front oxygen sensor is defined. It can be understood that in the deceleration fuel cut-off state, the voltage value of the front oxygen sensor gradually decreases, and the measured response rate of the front oxygen sensor is the average response efficiency of the front oxygen sensor in the period that the voltage value decreases to the second threshold value through the first threshold value.
In some examples, the second threshold has a value less than the first threshold, the first threshold is 0.5V to 0.7V, and the second threshold has a value of 0.2V to 0.4V.
The first threshold value is 0.5V to 0.7V, the second threshold value is 0.2V to 0.4V, on one hand, the detection time of the front oxygen sensor is clear, the detection of the front oxygen sensor is facilitated by a computer, a processor or a controller executing instructions, meanwhile, the detection time is controlled to a certain extent, the responsiveness diagnosis of the front oxygen sensor can be completed within 3s, the time that small-scale shaking of a vehicle is likely to occur is greatly reduced, and the user experience is improved.
In some examples, the first threshold may be 0.6V and the second threshold may be 0.3V.
In some examples, the front oxygen sensor responsiveness diagnostic method of the hybrid vehicle further includes: in the case where an increase in the air-fuel ratio occurs during detection, the detection is exited.
In the detection process, if the air-fuel ratio rises, the unexpected change of the gas mixture in the engine is indicated, and if the detection is continued, the detection is stopped immediately, the engine is pulled by the power generation integrated machine strongly, the deceleration fuel cut is simulated again, the actual measurement response rate of the front oxygen sensor is detected again, and the accuracy of the front oxygen sensor response diagnosis can be greatly improved.
In some examples, the front oxygen sensor responsiveness diagnostic method of the hybrid vehicle further includes: under the condition that the engine directly drives the vehicle, the engine is strongly towed by the integrated power generation machine under the control of multiple times of control, so that a plurality of front oxygen sensor response rate diagnostic values are obtained; and obtaining an average value of the plurality of front oxygen sensor response rate diagnostic values as a front oxygen sensor response diagnostic result.
After the primary front oxygen sensor response rate diagnosis value is obtained, the starting and power generation integrated machine can be controlled again to strongly drag the engine under the condition that the engine directly drives the vehicle, so that the step 102 and the step 104 are repeated, a plurality of front oxygen sensor response rate diagnosis values can be obtained, and the average value obtained by the plurality of front oxygen sensor response rate diagnosis values is used as a front oxygen sensor response diagnosis result, so that the detection accuracy can be greatly improved.
In some examples, to achieve both accuracy of detection and duration required for detection, four front oxygen sensor response rate diagnostic values may be obtained, and an average of the four front oxygen sensor response rate diagnostic values may be further calculated as a front oxygen sensor response diagnostic result.
In some examples, in the case of an engine direct drive vehicle, the step of responding to the responsive diagnostic information further comprises: receiving responsive diagnostic information; in the case where the front oxygen of the hybrid vehicle enters the closed loop, the operating state of the hybrid vehicle is acquired.
It will be appreciated that the accuracy of the front oxygen sensor responsiveness diagnosis may be improved by indicating that the front oxygen sensor has completed the readiness phase in the event that the front oxygen enters the closed loop, and that the vehicle enters the normal operation phase in which the responsiveness diagnosis information is responded again.
In some examples, the temperature of the front oxygen sensor may be detected to determine whether the front oxygen enters a closed loop state.
In some examples, the step of obtaining the operating state of the hybrid vehicle includes: acquiring state information of a clutch of the hybrid vehicle through an engine control unit; when the state information of the clutch is the connection state, the hybrid vehicle is in the engine direct-drive vehicle state.
It can be understood that the hybrid vehicle includes a clutch 4, an integrated starter-generator 2 (ISG Motor) and a Motor 3, the integrated starter-generator 2 being directly connected with the engine 1 for starting, generating and assisting; the engine 1 and the Motor 3 jointly output power, and a clutch 4 is arranged behind the engine 1 and used for switching modes; based on the hybrid electric vehicle, the hybrid electric vehicle can be switched between a pure electric-series-parallel mode, and in a pure electric state, the engine 1 and the starting and power generation integrated machine 2 do not work, and the power battery provides electric energy to the Motor 3 to drive the vehicle; in the series state, the clutch 4 is disengaged, the engine 1 is not involved in driving the vehicle, only the starting and power generation integrated machine 2 is driven to generate power, the Motor 3 is supplied to drive the vehicle, and redundant power generation is stored in the power battery; in the parallel state, the clutch 4 is engaged, the engine 1 directly drives the vehicle, and the Motor 3 is only responsible for the auxiliary power output under the limiting working condition. The embodiment of the application diagnoses the responsiveness of the front oxygen sensor only under the condition that the engine 1 directly drives the vehicle, can improve the diagnosis completion rate, avoids unnecessary detection and greatly improves the diagnosis efficiency.
In some examples, the hybrid vehicle includes a Vehicle Control Unit (VCU) for transmitting the operating state of the clutch 4 to the CAN network (3), and an engine 1 control unit (ECU) for determining the transmission mode according to the operating state of the clutch 4 and the rotational speed of the engine 1.
In some examples, the front oxygen sensor responsiveness diagnostic method of the hybrid vehicle further includes: in the case where the vehicle is not directly driven by the engine, the responsive diagnostic information is not responded.
In the case where the vehicle is not in the engine direct drive vehicle, it is indicated that the engine may not be in an operating state, and diagnosing the front oxygen sensor responsiveness in such a state may reduce the diagnosis completion rate. The method provided by the application is therefore responsive to responsive diagnostic information only in the case of an engine direct drive vehicle.
As shown in fig. 3, in some examples, a front oxygen sensor responsiveness diagnostic method of a hybrid vehicle includes:
step 201: judging whether the front oxygen of the hybrid vehicle enters a closed loop, if so, executing step 203, and if not, executing step 202;
step 202: judging that the current state does not meet the diagnosis requirement, and exiting the diagnosis;
step 203: determining a state of the clutch based on the engine control unit;
step 204: judging whether the clutch is disconnected, if yes, executing step 205, and if not, executing step 206;
step 205: judging that the vehicle is in a serial operation mode, and exiting from diagnosis;
step 206: determining that the hybrid vehicle is in an engine direct drive vehicle state, and responding to the responsive diagnostic information;
step 207: the engine control unit sends out a control instruction to control the starting and power generation integrated machine to strongly drag the engine, so that the process is in a deceleration and oil-break state;
step 208: the method comprises the steps of starting to acquire the actual measurement response rate of a front oxygen sensor;
step 209: judging whether the air-fuel ratio rises and whether the voltage value of the front oxygen sensor is larger than or smaller than a second threshold value, if so, executing step 210; if not, go to step 211;
step 210: exiting the diagnosis;
step 211: taking the measured response rate of the front oxygen sensor as a diagnosis value of the response rate of the front oxygen sensor;
step 212: judging whether four times of detection are completed; if yes, go to step 213, if no, go to step 204
Step 213: and taking the average value of the four obtained front oxygen sensor response rate diagnostic values as a front oxygen sensor response diagnostic result.
According to the method for diagnosing the responsiveness of the front oxygen sensor of the hybrid vehicle, when the responsiveness of the front oxygen sensor is required to be diagnosed, under the condition that responsiveness diagnosis information is received, under the condition that an engine of the hybrid vehicle directly drives the vehicle, the engine is strongly towed by a start-up integrated machine of the hybrid vehicle, so that the vehicle enters a speed reduction unit state, the actual measurement response rate of the front oxygen sensor and the air-fuel ratio are further detected in a speed reduction fuel-cut state, the state of the vehicle can be monitored by measuring the air-fuel ratio, and the detected actual measurement response rate of the front oxygen sensor is used as a front oxygen sensor response rate diagnosis value under the condition that the air-fuel ratio is in a descending trend. According to the embodiment of the application, on one hand, the actually measured response rate of the front oxygen sensor is detected and obtained only under the condition that the engine directly drives the vehicle, so that the diagnosis completion rate can be improved, unnecessary detection is avoided, and the diagnosis efficiency is greatly improved; on the other hand, the engine can be strongly towed by the starting and power generation integrated machine, so that the hybrid vehicle is in a deceleration and fuel cut-off state, detection time is provided for the responsiveness diagnosis of the front oxygen sensor, and the diagnosis efficiency is further improved; in the process of detecting the actual measurement response rate of the front oxygen sensor, the air-fuel ratio is obtained at the same time, and the actual measurement response rate of the front oxygen sensor is used as the diagnosis value of the response rate of the front oxygen sensor only under the condition that the air-fuel ratio is in a descending trend, so that the accuracy and the safety of the response diagnosis of the front oxygen sensor can be greatly improved. After the primary front oxygen sensor response rate diagnosis value is obtained, the starting and power generation integrated machine can be controlled again to strongly drag the engine under the condition that the engine directly drives the vehicle, so that the step 102 and the step 104 are repeated, a plurality of front oxygen sensor response rate diagnosis values can be obtained, and the average value obtained by the plurality of front oxygen sensor response rate diagnosis values is used as a front oxygen sensor response diagnosis result, so that the detection accuracy can be greatly improved.
As shown in fig. 4, a second aspect according to an embodiment of the present application provides a front oxygen sensor responsiveness diagnostic device of a hybrid vehicle, including: a memory 310 storing a computer program; a processor 320 executing a computer program; wherein the processor 320 implements the front oxygen sensor responsiveness diagnostic method of the hybrid vehicle of any one of the above-described aspects when executing the computer program.
The front oxygen sensor responsiveness diagnosis device of the hybrid vehicle executes a computer program through a processor, when responsiveness of the front oxygen sensor is required to be diagnosed, under the condition that responsiveness diagnosis information is received, the engine of the hybrid vehicle is directly driven, the engine is strongly towed by a start-up and power generation integrated machine of the hybrid vehicle in response to the responsiveness diagnosis information, so that the vehicle enters a speed reduction unit state, the actual measurement response rate of the front oxygen sensor and the air-fuel ratio are further detected in a speed reduction and fuel-cut state, the state of the vehicle can be monitored through measuring the air-fuel ratio, and the detected actual measurement response rate of the front oxygen sensor is taken as a front oxygen sensor response rate diagnosis value under the condition that the air-fuel ratio is in a descending trend. According to the embodiment of the application, on one hand, the actually measured response rate of the front oxygen sensor is detected and obtained only under the condition that the engine directly drives the vehicle, so that the diagnosis completion rate can be improved, unnecessary detection is avoided, and the diagnosis efficiency is greatly improved; on the other hand, the engine can be strongly towed by the starting and power generation integrated machine, so that the hybrid vehicle is in a deceleration and fuel cut-off state, detection time is provided for the responsiveness diagnosis of the front oxygen sensor, and the diagnosis efficiency is further improved; in the process of detecting the actual measurement response rate of the front oxygen sensor, the air-fuel ratio is obtained at the same time, and the actual measurement response rate of the front oxygen sensor is used as the diagnosis value of the response rate of the front oxygen sensor only under the condition that the air-fuel ratio is in a descending trend, so that the accuracy and the safety of the response diagnosis of the front oxygen sensor can be greatly improved.
In the description of the present application, the term "plurality" means two or more, unless explicitly defined otherwise, the orientation or positional relationship indicated by the terms "upper", "lower", etc. are based on the orientation or positional relationship shown in the drawings, merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application; the terms "coupled," "mounted," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present application, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, 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 present application. In the present application, the schematic representations of the above terms 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.
The above is only a preferred embodiment of the present application, and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (9)
1. A front oxygen sensor responsiveness diagnostic method of a hybrid vehicle, characterized by comprising:
responding to the responsive diagnostic information in the case of an engine direct drive vehicle;
controlling a starting and generating integrated machine of a hybrid power vehicle to strongly drag the engine so as to enable the hybrid power vehicle to be in a deceleration and fuel cut-off state;
under the condition that the hybrid vehicle is in a deceleration fuel cut-off state, acquiring the actual measurement response rate and the air-fuel ratio of a front oxygen sensor;
under the condition that the air-fuel ratio is in a decreasing trend in the detection process, taking the actually measured response rate of the front oxygen sensor as a front oxygen sensor response rate diagnostic value;
the step of acquiring the actual measurement response rate and the air-fuel ratio of the front oxygen sensor under the condition that the hybrid vehicle is in a deceleration fuel cut-off state comprises the following steps:
under the condition that the hybrid vehicle is in a deceleration fuel cut-off state and the voltage value of the front oxygen sensor is a first threshold value, acquiring the actual measurement response rate and the air-fuel ratio of the front oxygen sensor;
and stopping detection when the voltage value of the front oxygen sensor is a second threshold value.
2. The method of diagnosing responsiveness of a front oxygen sensor of a hybrid vehicle according to claim 1, wherein the step of controlling the start-up and power-generation integrated machine to strongly drag the engine so that the hybrid vehicle is in a deceleration fuel cut-off state includes:
controlling the starting and generating integrated machine to apply a force opposite to the steering of an output end of the engine to the engine so that the rotating speed of the engine is 400r/min to 2500r/min;
the starting and generating integrated machine strongly drags the engine for 1s to 3s.
3. The method for diagnosing responsiveness of a front oxygen sensor of a hybrid vehicle according to claim 1,
the value of the second threshold is smaller than that of the first threshold, the first threshold is 0.5V to 0.7V, and the value of the second threshold is 0.2V to 0.4V.
4. The front oxygen sensor responsiveness diagnostic method of a hybrid vehicle according to claim 1, further comprising:
in the case where the air-fuel ratio rises during detection, the detection is exited.
5. The front oxygen sensor responsiveness diagnostic method of a hybrid vehicle according to any one of claims 1 to 4, characterized by further comprising:
under the condition that the engine directly drives the vehicle, controlling the control start power generation integrated machine to strongly drag the engine for a plurality of times so as to obtain a plurality of front oxygen sensor response rate diagnostic values;
and obtaining an average value of a plurality of the front oxygen sensor response rate diagnostic values as the front oxygen sensor response diagnostic result.
6. The front oxygen sensor responsiveness diagnostic method of a hybrid vehicle according to any one of claims 1 to 5, characterized by further comprising, before the step of responding to responsiveness diagnostic information in the case of an engine direct-drive vehicle:
receiving responsive diagnostic information;
and acquiring the working state of the hybrid vehicle under the condition that the front oxygen of the hybrid vehicle enters a closed loop.
7. The front oxygen sensor responsiveness diagnostic method of a hybrid vehicle according to claim 6, wherein the step of acquiring an operating state of the hybrid vehicle includes:
acquiring state information of a clutch of the hybrid vehicle through an engine control unit;
and when the state information of the clutch is a connection state, the hybrid vehicle is in the engine direct-drive vehicle state.
8. The front oxygen sensor responsiveness diagnostic method of a hybrid vehicle according to claim 6, further comprising:
in the case where the vehicle is not directly driven by the engine, the responsive diagnostic information is not responded.
9. A front oxygen sensor responsiveness diagnostic device of a hybrid vehicle, characterized by comprising:
a memory storing a computer program;
a processor executing the computer program;
wherein the processor, when executing the computer program, implements the front oxygen sensor responsiveness diagnostic method of a hybrid vehicle according to any one of claims 1 to 8.
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