CN113561958B - Dynamic response diagnosis method and system for rear oxygen sensor of hybrid electric vehicle - Google Patents
Dynamic response diagnosis method and system for rear oxygen sensor of hybrid electric vehicle Download PDFInfo
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- CN113561958B CN113561958B CN202110833302.7A CN202110833302A CN113561958B CN 113561958 B CN113561958 B CN 113561958B CN 202110833302 A CN202110833302 A CN 202110833302A CN 113561958 B CN113561958 B CN 113561958B
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- 239000001301 oxygen Substances 0.000 title claims abstract description 125
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 125
- 230000004044 response Effects 0.000 title claims abstract description 107
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 238000003745 diagnosis Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000000446 fuel Substances 0.000 claims abstract description 43
- 230000002159 abnormal effect Effects 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 10
- 239000000110 cooling liquid Substances 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 7
- 238000002405 diagnostic procedure Methods 0.000 claims description 2
- 230000008859 change Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 8
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- 239000007789 gas Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
-
- 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
-
- 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
- B60W2050/0215—Sensor drifts or sensor failures
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Human Computer Interaction (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Hybrid Electric Vehicles (AREA)
Abstract
The invention discloses a method and a system for diagnosing dynamic response of a rear oxygen sensor of a hybrid electric vehicle, wherein the method comprises the following steps: receiving a request for allowing deceleration and fuel cut-off under a throttle receiving sliding working condition sent by a transmitter management system; after the vehicle is in the throttle-closing sliding working condition, controlling the target torque of the starting and generating integrated motor ISG to be zero based on the speed-reducing and fuel-cut-off allowing request; and performing dynamic response diagnosis on the rear oxygen sensor. According to the invention, the speed-reducing and fuel-cut-off request is allowed under the throttle-receiving sliding working condition sent by the transmitter management system, and the target torque of the starting and power-generating integrated motor is controlled to be zero after the speed-reducing and fuel-cut-off request is received and the vehicle is in the throttle-receiving sliding working condition, so that the engine enters the DFCO working condition similar to the traditional vehicle, the change of an oxygen signal from rich to lean can be realized, and the speed-reducing and fuel-cut-off working condition is created for the response diagnosis of the rear oxygen sensor.
Description
Technical Field
The invention relates to the technical field of hybrid electric vehicles, in particular to a method and a system for diagnosing dynamic response of a rear oxygen sensor of a hybrid electric vehicle.
Background
With the increasing severity of fuel consumption regulations in the automobile industry, traditional fuel vehicles cannot meet the strict requirements under the prior art conditions, so that new energy automobiles with low fuel consumption are rapidly growing. The pure electric vehicle is limited by the endurance mileage and the battery technology bottleneck, cannot be popularized in a large area at present, and the hybrid electric vehicle combines the respective advantages of the pure gasoline vehicle and the electric vehicle, so that the hybrid electric vehicle gradually becomes a main stream scheme of the current whole vehicle factory for coping with the fuel consumption regulation.
The oxygen sensor response diagnosis is used as an On-Board Diagnostic (OBD) rule requirement diagnosis item, is a manufacturer OBD demonstration necessary option, and has an important position in the whole vehicle OBD development process. The dynamic response diagnosis of the rear oxygen sensor of the traditional vehicle is mainly judged at the speed of the rise or fall of the voltage of the rear oxygen sensor under the acceleration enrichment working condition or the deceleration thinning working condition, but on the hybrid vehicle type, the engine is usually only operated or stopped, the working condition of DFCO (Deceleration Fuel Cut Off, deceleration fuel cut-off) in the sliding process of the traditional vehicle is not existed, and the response diagnosis of the rear oxygen sensor of the hybrid vehicle can not be carried out based on the diagnosis logic of the traditional vehicle.
Disclosure of Invention
The embodiment of the invention solves the technical problem that the hybrid electric vehicle cannot create a deceleration fuel cut-off working condition for the response diagnosis of the rear oxygen sensor in the prior art by providing the dynamic response diagnosis method and the system of the rear oxygen sensor of the hybrid electric vehicle.
In one aspect, the present invention provides the following technical solutions according to an embodiment of the present invention:
a method for diagnosing dynamic response of a rear oxygen sensor of a hybrid vehicle, comprising:
receiving a request for allowing deceleration and fuel cut-off under a throttle receiving sliding working condition sent by a transmitter management system;
after the vehicle is in the throttle-receiving sliding working condition, controlling the target torque of the starting and generating integrated motor ISG to be zero based on the speed-reducing and fuel-cut-off allowing request;
and performing dynamic response diagnosis on the rear oxygen sensor.
Preferably, before the receiving the request for allowing the deceleration and fuel cut-off under the condition of the throttle-receiving sliding sent by the sender management system, the method for diagnosing the dynamic response of the rear oxygen sensor of the hybrid electric vehicle further comprises the following steps:
judging whether the vehicle meets the preliminary diagnosis condition or not;
and if so, executing the step of allowing the deceleration fuel cut-off request under the throttle receiving sliding working condition sent by the receiving and sending machine management system.
Preferably, the preliminary diagnosis condition includes:
the engine speed is greater than a first preset speed and less than a second preset speed;
the running time of the engine is longer than a first preset time length;
the temperature of the cooling liquid is higher than a first preset temperature;
the intake air flow is greater than a preset flow threshold;
the air inlet temperature is higher than a second preset temperature; at least one of them.
Preferably, after the dynamic response diagnosis of the post-oxygen sensor, the method further includes:
after the dynamic response diagnosis is completed, receiving a request for prohibiting deceleration and oil cut-off under a throttle receiving sliding working condition sent by the transmitter management system;
and under the current driving cycle, if the vehicle is in the throttle-receiving sliding working condition again, reducing the engine rotating speed to zero by controlling the ISG based on the speed-reducing fuel cut-off request.
Preferably, the dynamic response diagnosis of the post-oxygen sensor includes:
if the voltage of the rear oxygen sensor is larger than the first preset voltage, acquiring the crossing time of the voltage of the rear oxygen sensor from the second preset voltage to the third preset voltage; the first preset voltage, the second preset voltage and the third preset voltage are sequentially reduced;
if the crossing time is smaller than a preset time threshold, judging that the dynamic response of the rear oxygen sensor is normal, otherwise, judging that the dynamic response of the rear oxygen sensor is abnormal and sending a fault code.
Preferably, the value range of the first preset voltage is 0.6V-0.7V.
On the other hand, the invention also provides the following technical scheme:
a hybrid vehicle rear oxygen sensor dynamic response diagnostic system comprising:
the request receiving module is used for receiving a request for allowing deceleration and fuel cut-off under the throttle receiving sliding working condition sent by the transmitter management system;
the working condition control module is used for controlling the target torque of the starting and generating integrated motor ISG to be zero based on the speed-reduction fuel cut-off request after the vehicle is in the throttle-receiving sliding working condition;
and the response diagnosis module is used for carrying out dynamic response diagnosis on the rear oxygen sensor.
Preferably, the request receiving module is further configured to receive a request for prohibiting deceleration and fuel cut-off under a throttle receiving sliding condition sent by the transmitter management system after the dynamic response diagnosis is completed;
and the working condition control module is also used for controlling the ISG to reduce the engine rotating speed to zero based on the speed-reduction prohibition fuel cut-off request if the vehicle is in the throttle-receiving sliding working condition again under the current driving cycle.
On the other hand, the invention also provides the following technical scheme:
an electronic device comprising a memory, a processor and a computer program stored on the memory and operable on the processor, wherein the processor implements any one of the above methods for dynamic response diagnosis of a rear oxygen sensor of a hybrid vehicle when executing the program.
On the other hand, the invention also provides the following technical scheme:
a computer readable storage medium that when executed implements any of the hybrid vehicle rear oxygen sensor dynamic response diagnostic methods described above.
One or more technical solutions provided in the embodiments of the present invention at least have the following technical effects or advantages:
the engine enters a DFCO working condition similar to a traditional vehicle, the change of an oxygen signal from rich to lean can be realized, and therefore, the deceleration fuel cut-off working condition is created for the response diagnosis of a rear oxygen sensor.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for diagnosing dynamic response of a rear oxygen sensor of a hybrid vehicle according to the present invention;
FIG. 2 is another flow chart of the method for diagnosing dynamic response of a rear oxygen sensor of a hybrid vehicle of the present invention;
FIG. 3 is a schematic diagram of step S3 of the present invention;
FIG. 4 is a graph of voltage across the rear oxygen sensor during deceleration and fuel cut under throttle take-up coasting conditions;
FIG. 5 is a block diagram of a dynamic response diagnostic system for a rear oxygen sensor of a hybrid vehicle according to the present invention.
Detailed Description
The embodiment of the invention solves the technical problem that the hybrid electric vehicle cannot create a deceleration fuel cut-off working condition for the response diagnosis of the rear oxygen sensor in the prior art by providing the dynamic response diagnosis and system of the rear oxygen sensor of the hybrid electric vehicle.
The technical scheme of the embodiment of the invention aims to solve the technical problems, and the overall thought is as follows:
a method for diagnosing dynamic response of a rear oxygen sensor of a hybrid vehicle, as shown in fig. 1, comprising:
step S1, receiving a request for allowing deceleration and fuel cut-off under a throttle receiving sliding working condition sent by a transmitter management system;
step S2, after the vehicle is in a throttle-closing sliding working condition, controlling the target torque of the starting and generating integrated motor ISG to be zero based on the request of allowing deceleration and fuel cut-off;
and step S3, performing dynamic response diagnosis on the post-oxygen sensor.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
First, the term "and/or" appearing herein is merely an association relationship describing associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
In step S1, when the vehicle is running, the transmitter management system (Engine Management System, EMS) sends a pre_dfco=1 signal to the vehicle controller (Vehicle Control Unit, VCU) through the CAN network, where the pre_dfco=1 signal corresponds to a deceleration fuel cut-off request allowed under a throttle-receiving coast condition, and the VCU receives the pre_dfco=1 signal and allows the vehicle to enter the deceleration fuel cut-off condition (DFCO) under a subsequent throttle-receiving coast condition.
In step S2, when the vehicle is in the throttle-receiving and sliding working condition, the VCU controls the target torque of the start-up and power generation integrated motor (Integrated Starter and Generator, ISG) to be zero, i.e. neither the engine is allowed to generate power nor the engine is actively applied with torque to stop the engine, at this time, the ISG motor is equivalent to an idle accessory, so that the engine enters the DFCO working condition similar to the conventional vehicle, and the change of the oxygen signal from rich to lean can be realized, thereby creating a basic working condition for the response diagnosis of the rear oxygen sensor. After the vehicle enters the DFCO working condition, a flag bit of a DFCO state signal in the EMS is set to be 1, which represents that the vehicle enters the DFCO working condition. After the DFCO condition is created for the post-oxygen sensor response diagnosis, the post-oxygen sensor dynamic response diagnosis can be achieved through step S3.
In this way, the embodiment allows the deceleration and fuel-cut request under the throttle receiving sliding working condition sent by the transmitter management system, and controls the target torque of the starting and generating integrated motor to be zero after the deceleration and fuel-cut request is received and the vehicle is in the throttle receiving sliding working condition, so that the engine enters a DFCO working condition similar to a traditional vehicle, the change of an oxygen signal from rich to lean can be realized, and the deceleration and fuel-cut working condition is created for the response diagnosis of the rear oxygen sensor.
Generally, the dynamic response diagnosis of the rear oxygen sensor needs the engine to run under a relatively steady state condition to ensure the accuracy and reliability of the diagnosis result, so that the preferred method for diagnosing the dynamic response of the rear oxygen sensor of the hybrid electric vehicle in the embodiment before step S1 further comprises: judging whether the vehicle meets the preliminary diagnosis condition or not; if so, step S1 is performed.
The preliminary diagnostic conditions are conditions that ensure that the engine is operating in a relatively steady state condition. Specifically, the preliminary diagnosis conditions include: the engine speed is greater than a first preset speed and less than a second preset speed; the running time of the engine is longer than a first preset time length; the temperature of the cooling liquid is higher than a first preset temperature; the intake air flow is greater than a preset flow threshold; the air inlet temperature is higher than a second preset temperature; at least one of them. For example, the preliminary diagnostic conditions include only the engine speed being greater than a first preset speed and less than a second preset speed; the running time of the engine is longer than a first preset time length; the temperature of the cooling liquid is higher than a first preset temperature; the intake air flow is greater than a preset flow threshold; the air inlet temperature is higher than a second preset temperature; any one of them; for example, the preliminary diagnostic conditions include only the engine speed being greater than a first preset speed and less than a second preset speed; the running time of the engine is longer than a first preset time length; the temperature of the cooling liquid is higher than a first preset temperature; the intake air flow is greater than a preset flow threshold; the air inlet temperature is higher than a second preset temperature; any two of these; for example, the preliminary diagnostic conditions include only the engine speed being greater than a first preset speed and less than a second preset speed; the running time of the engine is longer than a first preset time length; the temperature of the cooling liquid is higher than a first preset temperature; the intake air flow is greater than a preset flow threshold; the air inlet temperature is higher than a second preset temperature; any three of these; for example, the preliminary diagnostic conditions include only the engine speed being greater than a first preset speed and less than a second preset speed; the running time of the engine is longer than a first preset time length; the temperature of the cooling liquid is higher than a first preset temperature; the intake air flow is greater than a preset flow threshold; the air inlet temperature is higher than a second preset temperature; any four of the following; for example, the preliminary diagnostic conditions include only the engine speed being greater than a first preset speed and less than a second preset speed; the running time of the engine is longer than a first preset time length; the temperature of the cooling liquid is higher than a first preset temperature; the intake air flow is greater than a preset flow threshold; the air inlet temperature is higher than a second preset temperature; all of which are described herein.
If the engine speed is too small, the oil-cut time is too short, and the duration of the engine entering the DFCO working condition is too short, so that the dynamic response diagnosis of the rear oxygen sensor is possibly difficult to finish; if the engine speed is too high, the oil-cut time is too long, adverse effects can be caused on vehicle driving, in the embodiment, the preliminary diagnosis conditions comprise that the engine speed is larger than the first preset speed and smaller than the second preset speed, the engine speed can be ensured to receive a request for allowing deceleration and oil-cut into a DFCO working condition when the engine speed is at a proper value, the oil-cut time is proper, the dynamic response diagnosis of the oxygen sensor after completion can be ensured, and meanwhile, the adverse effects on vehicle driving are avoided. The first preset rotational speed may be 1100r/min (revolutions per second) and the second preset rotational speed may be 3000r/min.
The preliminary diagnosis conditions comprise that the running time of the engine is longer than a first preset time length, the water temperature stability and the fuel self-learning stability of the vehicle can be ensured, the running of the engine under a relatively steady-state working condition can be ensured, and the accuracy of the dynamic response diagnosis result of the rear oxygen sensor can be ensured. The first preset duration may be 120s.
The initial diagnosis condition comprises that the temperature of the cooling liquid is larger than the first preset temperature, so that the self-learning stability of the fuel is guaranteed, and the accuracy of the dynamic response diagnosis result of the rear oxygen sensor is guaranteed. The first preset temperature may be 60 ℃.
The intake air flow is smaller than the preset flow threshold, so that the dynamic response diagnosis of the oxygen sensor after false alarm is failed, and the preliminary diagnosis conditions comprise that the intake air flow is larger than the preset flow threshold, so that the dynamic response diagnosis of the oxygen sensor after false alarm is avoided. The preset flow threshold may be 2g/s (grams per second).
Wherein the intake air temperature is greater than the second preset temperature as a base preparation condition that the OBD regulations require to meet before dynamic response diagnostics of the post-oxygen sensor. The second preset temperature may be-7 ℃.
From the above, the vehicle can receive the request for allowing deceleration and fuel cut-off after meeting the preliminary diagnosis condition, which is beneficial to ensuring the operation of the engine under the working condition of relative steady state, improving the diagnosis robustness and avoiding the occurrence of false alarm fault condition.
It is easy to think that after the vehicle runs once by the dynamic response diagnosis method of the post-oxygen sensor in the steps S1-S3, if the next time the vehicle meets the preliminary diagnosis condition and the vehicle is in the throttle-closing sliding working condition under the current driving cycle, the engine still enters the DFCO working condition, and the dynamic response diagnosis of the post-oxygen sensor is performed again. However, OBD regulations prescribe that only one post-oxygen sensor dynamic response diagnosis is required in one driving cycle, multiple diagnoses are not actually required, and frequent DFCO condition entry in one driving cycle has negative effects on emissions and fuel consumption. Wherein, the current driving cycle refers to one cycle of power-on-ignition-running-flameout of the vehicle. In order to avoid the negative influence of frequent DFCO working conditions on emission and fuel consumption on the premise of meeting OBD regulations, as shown in fig. 2, after the preferred step S3 in this embodiment, the method for diagnosing the dynamic response of the rear oxygen sensor of the hybrid electric vehicle further includes:
s4, after the dynamic response diagnosis is completed, receiving a request for prohibiting deceleration and fuel cut-off under a throttle receiving sliding working condition sent by a transmitter management system;
and S5, under the current driving cycle, if the vehicle is in the throttle-receiving sliding working condition again, the engine speed is reduced to zero by controlling the ISG based on the request of prohibiting deceleration and fuel cut-off.
In step S4, the completion of the dynamic response diagnosis includes both the determination that the dynamic response of the post-oxygen sensor is normal and the determination that the dynamic response of the post-oxygen sensor is abnormal. After the first dynamic response diagnosis under the current driving cycle is completed, a flag bit of a DFCO state signal in the EMS is set to 0 to represent that the diagnosis is completed, the vehicle EMS sends a Pre_DFCO=0 signal to the VCU through a CAN network, and the Pre_DFCO=0 signal corresponds to a deceleration fuel cut request forbidden under a throttle receiving sliding working condition, and the vehicle EMS requests the VCU to forbid the DFCO under the throttle receiving sliding working condition.
In step S5, after receiving the pre_dfco=0 signal, the VCU directly controls the ISG motor to perform a flameout operation on the engine to make the engine speed quickly drop to zero, and the current driving cycle EMS and the VCU do not link any more to perform a dynamic response diagnosis of the rear oxygen sensor when the current driving cycle does not allow DFCO under the throttle receiving sliding condition.
After the dynamic response of the oxygen sensor is diagnosed after the current driving cycle is finished once, if the vehicle is in the throttle-receiving sliding working condition again, the VCU directly controls the ISG motor to enable the engine speed to be reduced to zero, the engine is prevented from entering the DFCO working condition again, the condition that the DFCO is frequently entered in one driving cycle is avoided, emission and oil consumption are reduced, and the influence on the overall vehicle emission and economy is reduced as much as possible on the premise of meeting OBD regulations.
As shown in fig. 3, step S3 of the present embodiment includes:
step S31, if the voltage of the rear oxygen sensor is larger than the first preset voltage, acquiring the crossing time of the voltage of the rear oxygen sensor from the second preset voltage to the third preset voltage; the first preset voltage, the second preset voltage and the third preset voltage are sequentially reduced;
and S32, if the crossing time is smaller than the preset time threshold, judging that the dynamic response of the rear oxygen sensor is normal, otherwise, judging that the dynamic response of the rear oxygen sensor is abnormal and sending a fault code.
Generally, before the engine enters the throttle-receiving sliding DFCO working condition, the mixed gas in the engine is in a concentrated state, and the voltage of the rear oxygen sensor is higher; after the engine enters the throttle receiving sliding DFCO working condition, the mixed gas in the engine is in a lean state, and the voltage of the rear oxygen sensor is gradually attenuated from a higher value to a lower value. Under the working condition of the throttle sliding DFCO, in a normal state, the dynamic response of the rear oxygen sensor is fast, as shown in fig. 4, the crossing time of the voltage of the rear oxygen sensor from the second preset voltage to the third preset voltage should be smaller than the preset time threshold, the typical value of the second preset voltage is 0.55V, and the typical value of the third preset voltage is 0.3V. If the crossing time from the second preset voltage to the third preset voltage of the rear oxygen sensor is greater than the preset time threshold, the dynamic response of the rear oxygen sensor is slow, and the dynamic response of the rear oxygen sensor is abnormal. The crossing time refers to the time taken for the voltage of the post-oxygen sensor to decay from the second preset voltage to the third preset voltage. This completes the dynamic response diagnosis of the post-oxygen sensor through step S31 to step S32.
If the preset time threshold is set too long, even if the dynamic response of the rear oxygen sensor is abnormal, the corresponding crossing time may be smaller than the preset time threshold, so that the abnormality cannot be detected; if the preset time threshold is set too short, even if the dynamic response of the rear oxygen sensor is normal, the corresponding crossing time may be greater than the preset time threshold, resulting in false alarm abnormality. In this embodiment, the preset time threshold is preferably 2s, and the value is proper, so that the abnormal dynamic response of the rear oxygen sensor cannot be detected, and the abnormal dynamic response of the rear oxygen sensor can be avoided.
In step S31, when the engine enters DFCO, the VCU first determines whether the voltage of the rear oxygen sensor is greater than a first preset voltage, if so, starts to record the crossing time, otherwise waits for the next throttle receiving sliding DFCO condition. The object of the dynamic response diagnosis of the post-oxygen sensor specified by the OBD rule is the time taken for the voltage of the post-oxygen sensor to decay from the second preset voltage to the third preset voltage, but if the voltage of the post-oxygen sensor is only slightly greater than the second preset voltage when the engine enters the DFCO, the diagnosis can be completed, but the voltage of the post-oxygen sensor is already lower than the second preset voltage at the beginning of the crossing time timing, the recorded crossing time is smaller than the actual crossing time, and the diagnosis result is inaccurate. Therefore, in this embodiment, the diagnosis of the crossing time is performed only when the voltage of the post-oxygen sensor is greater than the first preset voltage, and since the first preset voltage is greater than the second preset voltage, it is ensured that the voltage of the post-oxygen sensor is accurately at the second preset voltage when the timing of the crossing time begins, and the accuracy of the diagnosis result is ensured. If the first preset voltage is set to be too large, the voltage of the rear oxygen sensor cannot reach the first preset voltage when the dynamic response of the rear oxygen sensor is normal, so that diagnosis cannot be performed; if the first preset voltage is set to be too small, the voltage of the oxygen sensor is accurately at the second preset voltage after the start of the time counting of the crossing time cannot be effectively ensured. In this embodiment, the value range of the first preset voltage is preferably 0.6V-0.7V, so that the normal entry of diagnosis can be ensured, and the voltage of the oxygen sensor can be effectively ensured to be accurately at the second preset voltage after the start of the passing time timing. Preferably, the first preset voltage is 0.65V, and the effect of ensuring that the voltage of the oxygen sensor is accurately at the second preset voltage after the diagnosis of normal entry and the start of the crossing time timing is best.
In step S32, it is determined that the dynamic response of the post-oxygen sensor fails in diagnosis, and a fault code is sent to the background, so that a background detector can timely know that the dynamic response of the post-oxygen sensor is abnormal, and timely repair is facilitated.
The embodiment also provides a dynamic response diagnosis system of the rear oxygen sensor of the hybrid electric vehicle, as shown in fig. 5, including:
the request receiving module is used for receiving a request for allowing deceleration and fuel cut-off under the throttle receiving sliding working condition sent by the transmitter management system;
the working condition control module is used for controlling the target torque of the starting and generating integrated motor ISG to be zero based on the request of allowing deceleration and fuel cut after the vehicle is in the accelerator-off sliding working condition;
and the response diagnosis module is used for carrying out dynamic response diagnosis on the rear oxygen sensor.
According to the dynamic response diagnosis system of the rear oxygen sensor of the hybrid electric vehicle, the speed-reducing fuel-cut-off request is allowed under the throttle-receiving sliding working condition sent by the transmitter management system, the target torque of the starting and power-generating integrated motor is controlled to be zero after the speed-reducing fuel-cut-off request is allowed and the vehicle is in the throttle-receiving sliding working condition is received, so that the engine enters the DFCO working condition similar to that of a traditional vehicle, the change of an oxygen signal from rich to lean can be realized, and the speed-reducing fuel-cut-off working condition is created for the response diagnosis of the rear oxygen sensor.
Further, the request receiving module is further used for receiving a request for prohibiting deceleration and fuel cut-off under a throttle receiving sliding working condition sent by the transmitter management system after the dynamic response diagnosis is completed; the working condition control module is also used for reducing the engine rotating speed to zero by controlling the ISG under the current driving cycle if the vehicle is in the throttle-receiving sliding working condition again. After the dynamic response of the oxygen sensor is diagnosed after the current driving cycle is finished once, if the vehicle is in the throttle-receiving sliding working condition again, the VCU directly controls the ISG motor to enable the engine speed to be reduced to zero, the engine is prevented from entering the DFCO working condition again, the condition that the DFCO is frequently entered in one driving cycle is avoided, emission and oil consumption are reduced, and the influence on the overall vehicle emission and economy is reduced as much as possible on the premise of meeting OBD regulations.
Based on the same inventive concept as the above-mentioned method for diagnosing the dynamic response of the rear oxygen sensor of the hybrid electric vehicle, the present embodiment further provides an electronic apparatus, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the steps of any one of the methods for diagnosing the dynamic response of the rear oxygen sensor of the hybrid electric vehicle.
Where a bus architecture (represented by a bus), a bus may comprise any number of interconnected buses and bridges, linking together various circuits, including one or more processors, as represented by a processor, and a memory, as represented by a memory. The bus may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., as are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface between the bus and the receiver and transmitter. The receiver and the transmitter may be the same element, i.e. a transceiver, providing a unit for communicating with various other apparatus over a transmission medium. The processor is responsible for managing the bus and general processing, while the memory may be used to store data used by the processor in performing operations.
Since the electronic device described in this embodiment is an electronic device used to implement the method for diagnosing dynamic response of a rear oxygen sensor of a hybrid vehicle according to the embodiment of the present invention, based on the method for diagnosing dynamic response of a rear oxygen sensor of a hybrid vehicle described in the embodiment of the present invention, those skilled in the art can understand the specific implementation of the electronic device of this embodiment and various modifications thereof, so that a detailed description of how the method of this embodiment of the present invention is implemented for this electronic device will not be provided herein. As long as the person skilled in the art implements the electronic device adopted by the dynamic response diagnosis method of the rear oxygen sensor of the hybrid electric vehicle in the embodiment of the invention, the electronic device belongs to the scope of protection of the invention.
Based on the same invention conception as the method for diagnosing the dynamic response of the rear oxygen sensor of the hybrid electric vehicle, the invention also provides a computer readable storage medium which realizes the method for diagnosing the dynamic response of the rear oxygen sensor of any hybrid electric vehicle when being executed.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. A method for diagnosing a dynamic response of a rear oxygen sensor of a hybrid vehicle, comprising:
receiving a request for allowing deceleration and fuel cut-off under a throttle receiving sliding working condition sent by a transmitter management system;
after the vehicle is in the throttle-closing sliding working condition ， Controlling the target torque of the starting and generating integrated motor ISG to be zero based on the speed-reducing and fuel-cut-off allowing request;
performing dynamic response diagnosis on the rear oxygen sensor;
the dynamic response diagnosis of the post-oxygen sensor comprises the following steps:
if the voltage of the rear oxygen sensor is larger than the first preset voltage, acquiring the crossing time of the voltage of the rear oxygen sensor from the second preset voltage to the third preset voltage; the first preset voltage, the second preset voltage and the third preset voltage are sequentially reduced;
if the crossing time is smaller than a preset time threshold, judging that the dynamic response of the rear oxygen sensor is normal, otherwise, judging that the dynamic response of the rear oxygen sensor is abnormal and sending a fault code.
2. The method for diagnosing a dynamic response of a rear oxygen sensor of a hybrid vehicle according to claim 1, wherein the method further comprises, before receiving the request for allowing deceleration and fuel cut under the condition of throttle coasting, the request for allowing deceleration and fuel cut is sent by the transmitter management system:
judging whether the vehicle meets the preliminary diagnosis condition or not;
and if so, executing the step of allowing the deceleration fuel cut-off request under the throttle receiving sliding working condition sent by the receiving and sending machine management system.
3. The method for diagnosing a dynamic response of a rear oxygen sensor of a hybrid vehicle as recited in claim 2, wherein said preliminary diagnostic conditions include:
the engine speed is greater than a first preset speed and less than a second preset speed;
the running time of the engine is longer than a first preset time length;
the temperature of the cooling liquid is higher than a first preset temperature;
the intake air flow is greater than a preset flow threshold;
the air inlet temperature is higher than a second preset temperature; at least one of them.
4. The method for diagnosing a dynamic response of a rear oxygen sensor of a hybrid vehicle as set forth in claim 1, further comprising, after said diagnosing the dynamic response of the rear oxygen sensor:
after the dynamic response diagnosis is completed, receiving a request for prohibiting deceleration and oil cut-off under a throttle receiving sliding working condition sent by the transmitter management system;
and under the current driving cycle, if the vehicle is in the throttle-receiving sliding working condition again, reducing the engine rotating speed to zero by controlling the ISG based on the speed-reducing fuel cut-off request.
5. The method for diagnosing a dynamic response of a rear oxygen sensor of a hybrid vehicle according to claim 1, wherein the first preset voltage has a value ranging from 0.6V to 0.7V.
6. A hybrid vehicle rear oxygen sensor dynamic response diagnostic system, comprising:
the request receiving module is used for receiving a request for allowing deceleration and fuel cut-off under the throttle receiving sliding working condition sent by the transmitter management system;
the working condition control module is used for controlling the target torque of the starting and generating integrated motor ISG to be zero based on the speed-reduction fuel cut-off request after the vehicle is in the throttle-receiving sliding working condition;
the response diagnosis module is used for carrying out dynamic response diagnosis on the rear oxygen sensor;
the response diagnosis module performs dynamic response diagnosis on the rear oxygen sensor, and comprises the following steps:
if the voltage of the rear oxygen sensor is larger than the first preset voltage, acquiring the crossing time of the voltage of the rear oxygen sensor from the second preset voltage to the third preset voltage; the first preset voltage, the second preset voltage and the third preset voltage are sequentially reduced;
if the crossing time is smaller than a preset time threshold, judging that the dynamic response of the rear oxygen sensor is normal, otherwise, judging that the dynamic response of the rear oxygen sensor is abnormal and sending a fault code.
7. The system for diagnosing a dynamic response of a rear oxygen sensor of a hybrid vehicle according to claim 6, wherein the request receiving module is further configured to receive a request for prohibiting deceleration and fuel cut-off under a throttle coasting condition sent by the transmitter management system after the dynamic response diagnosis is completed;
the working condition control module is also used for controlling the starting and generating integrated motor to enable the rotating speed of the engine to be quickly reduced to zero based on the speed-reduction prohibition fuel cut-off request if the vehicle is in the throttle-receiving sliding working condition again under the current driving cycle.
8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the method for dynamic response diagnosis of a rear oxygen sensor of a hybrid vehicle according to any one of claims 1-5 when the program is executed by the processor.
9. A computer readable storage medium, wherein the computer readable storage medium when executed implements the hybrid vehicle rear oxygen sensor dynamic response diagnostic method of any one of claims 1-5.
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| CN102374002B (en) * | 2010-08-13 | 2013-09-18 | 长春易控汽车电子有限公司 | Oxygen sensor diagnostic method |
| KR101393800B1 (en) * | 2012-08-24 | 2014-05-12 | 기아자동차주식회사 | Diagnosis method of oxygen sensor for hybrid vehicle |
| JP6593160B2 (en) * | 2015-12-25 | 2019-10-23 | スズキ株式会社 | Drive control device for hybrid vehicle |
| CN111942364A (en) * | 2019-05-16 | 2020-11-17 | 北京车和家信息技术有限公司 | Method and device for executing rear oxygen diagnosis of hybrid vehicle |
| CN112761765B (en) * | 2021-01-13 | 2022-06-28 | 联合汽车电子有限公司 | Detection method for slow reaction of after-oxygen sensor voltage from rich to lean based on active oil cut-off |
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