CN110552785A - Engine misfire detection system and method for hybrid vehicle and HCU thereof - Google Patents
Engine misfire detection system and method for hybrid vehicle and HCU thereof Download PDFInfo
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D17/00—Controlling engines by cutting out individual cylinders; Rendering engines inoperative or idling
- F02D17/02—Cutting-out
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1015—Engines misfires
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Abstract
The invention discloses an engine fire detection system and method of a hybrid vehicle and an HCU thereof, and the detection method comprises the following steps aiming at a parallel operation mode: presetting a first misfire detection threshold value in a parallel mode and a second misfire detection threshold value in a series mode; acquiring a misfire detection signal; obtaining a judgment result that a primary fire fault possibly exists according to the first condition, and switching to a series operation mode; acquiring a judgment result of the existence of the primary fire fault by meeting a second condition, outputting fire cylinder information and cutting off an oil injection instruction of the fire cylinder; wherein the first condition is that the current misfire detection signal exceeds a first misfire detection threshold; the second condition is that the misfire detection signal currently exceeds a second misfire detection threshold. By applying the scheme, when the real fire fault occurs, the fire cylinder can be accurately reported, and meanwhile, the false alarm fire fault caused by the fluctuation of the rotating speed of the engine caused by the motor is avoided.
Description
Technical Field
The invention relates to the technical field of hybrid electric vehicles, in particular to an engine fire detection system and method of a hybrid electric vehicle and an HCU (hybrid control unit) thereof.
Background
As is known, when an engine is on fire, the idling vibration of a vehicle, sudden noise in refueling, weak rapid acceleration and other fault expressions can be caused, and the user experience is directly influenced. For a hybrid electric vehicle, misfire faults widely exist, and the monitoring, judging and processing of the misfire faults have the problem of low reliability.
The existing deep hybrid electric vehicle has two running modes of parallel connection and series connection, wherein an engine and a motor are mechanically and rigidly connected to jointly drive the vehicle to be in a parallel connection mode; the engine is used only for power generation and is not rigidly connected to the vehicle in series mode. For the misfire trouble, monitoring is usually carried out based on the undulant range of engine speed, and to deep hybrid vehicle under the parallel mode, the motor rotation with engine rigid connection can influence the change of engine speed, and then leads to the reliability reduction of misfire monitoring, mainly reflects in two aspects:
First, for the case where a real misfire occurs. When a misfire occurs, the rotational speed may be significantly reduced, and the engine control unit ECM determines whether the misfire occurs by calculating a rate of reduction of the rotational speed. However, the motor may interfere with the fluctuation of the engine speed, which may increase the irregularity of the fluctuation of the engine speed, and if the engine is continuously on fire in a single cylinder or multiple cylinders, the interference may cause that which cylinder is on fire cannot be accurately determined by the existing strategy.
Second, for the case where no real misfire occurs. Under certain engine operation conditions, the motor may interfere with the operation of the engine, resulting in increased engine speed ripple, at which point there is a possibility of misinterpreting the misfire.
In view of this, it is desirable to optimize the engine misfire detection technology of the conventional hybrid vehicle to effectively overcome the defects that the cylinder that is misfired cannot be accurately determined and the misfire error exists.
Disclosure of Invention
In order to solve the technical problems, the invention provides an engine fire detection method and system of a hybrid vehicle and an HCU thereof, which can accurately report a cylinder on fire when a real fire fault occurs and simultaneously avoid the false alarm of the fire fault caused by the fluctuation of the rotating speed of the engine caused by a motor.
The invention provides an engine misfire detection method of a hybrid vehicle, which is used in a parallel operation mode and comprises the following steps:
Presetting a first misfire detection threshold value in a parallel mode and a second misfire detection threshold value in a series mode;
Acquiring a misfire detection signal;
obtaining a judgment result that a primary fire fault possibly exists according to the first condition, and switching to a series operation mode; acquiring a judgment result of the existence of the primary fire fault by meeting a second condition, outputting fire cylinder information and cutting off an oil injection instruction of the fire cylinder;
Wherein the first condition is that the number of times that the current misfire detection signal exceeds a first misfire detection threshold value within a first detection period is greater than a first threshold value; the second condition is that the number of times the misfire detection signal currently exceeds the second misfire detection threshold value in the first detection period is larger than the second threshold value.
Preferably, after the switching to the series operation mode, the judgment result that the primary misfire fault does not exist is obtained by not meeting the second condition, and the switching is performed to the parallel operation mode; and no longer switches to the series operating mode for the first length of time.
Preferably, after the switching to the series operation mode, a judgment result of the existence of the secondary misfire fault is obtained according to a third condition; the third condition is that the number of times that the misfire detection signal currently exceeds the second misfire detection threshold value in a plurality of the first detection periods is continuously larger than the second threshold value.
Preferably, in the parallel operation mode, the judgment result that the three-stage misfire fault exists is obtained by satisfying the fourth condition; the fourth condition is that the number of times that the current misfire detection signal exceeds the first misfire detection threshold value in the second detection period is greater than a third threshold value; and the ignition frequency in the second detection period is greater than that in the first detection period.
preferably, in the parallel operation mode, the judgment result that the four-stage misfire fault exists is obtained under the fifth condition; the fifth condition is that the number of times the misfire detection signal currently exceeds the first misfire detection threshold value within a plurality of the second detection periods in one driving cycle is larger than a third threshold value.
the invention provides another engine misfire detection method for a hybrid vehicle, comprising the steps of:
Presetting a first misfire detection threshold value in a parallel mode and a second misfire detection threshold value in a series mode;
acquiring a misfire detection signal;
Judging the misfire fault based on the current operation mode:
under a series operation mode, acquiring a judgment result of the existence of the primary fire fault by meeting a second condition, outputting fire cylinder information and cutting off an oil injection instruction of the fire cylinder;
under the parallel operation mode, obtaining a judgment result that a primary fire fault possibly exists according to the first condition, and switching to the series operation mode; acquiring a judgment result of the existence of the primary fire fault according to the second condition, outputting fire cylinder information and cutting off an oil injection instruction of the fire cylinder;
wherein the first condition is that the number of times that the current misfire detection signal exceeds a first misfire detection threshold value within a first detection period is greater than a first threshold value; the second condition is that the number of times the misfire detection signal currently exceeds the second misfire detection threshold value in the first detection period is larger than the second threshold value.
preferably, after the switching to the series operation mode, the judgment result that the primary misfire fault does not exist is obtained by not meeting the second condition, and the switching is performed to the parallel operation mode; and no longer switches to the series operating mode for the first length of time.
preferably, in the series operating mode, a judgment result that there is a secondary misfire fault is obtained in conformity with a third condition; the third condition is that the number of times that the misfire detection signal currently exceeds the second misfire detection threshold value in a plurality of the first detection periods is continuously larger than the second threshold value.
Preferably, in the parallel operation mode, the judgment result that the three-stage misfire fault exists is obtained by satisfying the fourth condition; the fourth condition is that the number of times that the current misfire detection signal exceeds the first misfire detection threshold value in the second detection period is greater than a third threshold value; and the ignition frequency in the second detection period is greater than that in the first detection period.
Preferably, in the parallel operation mode, the judgment result that the four-stage misfire fault exists is obtained under the fifth condition; the fifth condition is that the number of times the misfire detection signal currently exceeds the first misfire detection threshold value within a plurality of the second detection periods in one driving cycle is larger than a third threshold value.
the present invention provides an engine misfire detection system for a hybrid vehicle, comprising:
A storage unit for storing a first misfire detection threshold value in a parallel mode and a second misfire detection threshold value in a series mode;
an acquisition unit configured to acquire a misfire detection signal;
a control unit that performs misfire failure determination based on the current operation mode, wherein:
Under a series operation mode, obtaining a judgment result of the existence of the primary fire fault by meeting a second condition, and outputting the information of the fire cylinders and cutting off the oil injection instructions of the fire cylinders through an output unit;
Under the parallel operation mode, obtaining a judgment result that a primary fire fault possibly exists according to the first condition, and switching to the series operation mode; obtaining a judgment result of the existence of the primary fire fault by meeting a second condition, and outputting the information of the fire cylinder and cutting off an oil injection instruction of the fire cylinder through an output unit;
Wherein the first condition is that the number of times that the current misfire detection signal exceeds a first misfire detection threshold value within a first detection period is greater than a first threshold value; the second condition is that the number of times the misfire detection signal currently exceeds the second misfire detection threshold value in the first detection period is larger than the second threshold value.
Preferably, after the switching to the series operation mode, the control unit further obtains a judgment result that the primary misfire fault does not exist according to the second condition, and switches to the parallel operation mode; and no longer switches to the series operating mode for the first length of time.
Preferably, in the series operating mode, the control unit further obtains a judgment result that there is a secondary misfire fault in conformity with a third condition; the third condition is that the number of times that the misfire detection signal currently exceeds the second misfire detection threshold value in a plurality of the first detection periods is continuously larger than the second threshold value.
preferably, in the parallel operation mode, the control unit further obtains a determination result that there is a three-level misfire fault at a condition that satisfies a fourth condition; the fourth condition is that the number of times that the current misfire detection signal exceeds the first misfire detection threshold value in the second detection period is greater than a third threshold value; and the ignition frequency in the second detection period is greater than that in the first detection period.
preferably, in the parallel operation mode, the control unit obtains a determination result that the four-stage misfire fault exists, in a case where a fifth condition is satisfied; the fifth condition is that the number of times the misfire detection signal currently exceeds the first misfire detection threshold value within a plurality of the second detection periods in one driving cycle is larger than a third threshold value.
The present invention provides a hybrid vehicle HCU for handling series and parallel operating mode requests from the engine misfire detection system as described above.
Compared with the prior art, the invention is a new method for optimizing the fire detection technology of the hybrid vehicle, and presets corresponding fire detection threshold values for the parallel operation mode and the series operation mode respectively: a first misfire detection threshold in the parallel mode and a second misfire detection threshold in the series mode; when a fire fault occurs in the parallel operation mode, the serial operation mode is switched to for further fire fault judgment, so that false alarm possibly caused by engine rotating speed fluctuation generated by the motor can be avoided, and the problem of unreliable fire judgment in the parallel mode that the engine and the motor are rigidly connected to drive the vehicle together can be effectively avoided; meanwhile, the misfire cylinder can be further confirmed by switching to the series operation mode, the misfire cylinder information can be accurately reported, and operations such as cutting off an oil injection instruction of the misfire cylinder are completed.
In a preferred embodiment of the present invention, the degree of the misfire fault is graded, and in the parallel operation mode, the switching to the series operation mode is performed to further determine only when the misfire fault with a higher severity occurs, for example, a primary misfire fault or a more severe secondary misfire fault in which the number of misfire faults is greater than a threshold value within a detection period. And the operation mode switching is not carried out for further judgment on the slight fire fault, for example, a three-level fire fault of the slight fire or a four-level fire fault with overproof emission avoids that the comfort of the vehicle is influenced by frequently carrying out the mode switching under the low-level fault.
In another preferred aspect of the present invention, after switching to the series operating mode, if it is confirmed that the misfire malfunction is not detected again, the series request is exited to switch to the parallel operating mode, and the series request is not sent any more for a subsequent certain length of time. That is, the non-misfire fault is detected again after the switching to the series operation mode, which belongs to the motor disturbance situation, and even if the misfire fault is detected again after the switching back to the parallel operation mode, the series request is not immediately sent, so that the reduction of the vehicle comfort caused by frequent mode switching is avoided.
drawings
FIG. 1 is a flowchart of an engine misfire detection method of a hybrid vehicle according to an embodiment;
FIG. 2 is a functional block diagram of an engine misfire detection system of the hybrid vehicle according to one embodiment;
Fig. 3 is a flowchart of an engine misfire detection method of a hybrid vehicle according to a second embodiment.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Without loss of generality, the present embodiment proposes engine misfire detection schemes for hybrid vehicles having two operation modes, namely, a parallel operation mode and a series operation mode. The engine and the motor are mechanically and rigidly connected to drive the vehicle in a parallel mode as in the prior art; the engine is used only for power generation and is not rigidly connected to the vehicle in series mode. The switching of the operation modes is realized by controlling a whole vehicle hybrid power system control unit HCU (hybrid).
Example 1:
Referring to fig. 1, fig. 1 is a flowchart illustrating an engine misfire detection method for a hybrid vehicle according to an embodiment of the present invention.
The engine misfire detection method of the hybrid vehicle comprises the following steps:
And S11, presetting misfire detection thresholds in the parallel mode and the series mode.
The parallel mode is a first misfire detection threshold value, and the series mode is a second misfire detection threshold value; specifically, the engine can be operated in each mode, the misfire is simulated and measured, and the value of the misfire detection signal is set according to the value of the misfire detection signal.
s12, a misfire detection signal is acquired. The method for calculating the current misfire detection signal by acquiring the engine speed signal in real time can be realized by adopting the prior art, and the calculation method is not the core invention point of the application, so the details are not repeated herein.
s13, judging the misfire fault based on the current operation mode; that is, the first misfire detection threshold is used as a basis for the determination in the parallel mode, and the second misfire detection threshold is used as a basis for the determination in the series mode.
S131, under the series operation mode, obtaining a judgment result of the existence of the primary misfire fault according to the second condition, executing the step S133, and outputting the information of the misfire cylinder and cutting off an oil injection instruction of the misfire cylinder; the second condition means that the current fire detection signal exceeds a second fire detection threshold value in the series mode, and based on the characteristic that the series mode is slightly interfered by the rotating speed of the motor, the conventional treatment of reporting and discharging the fire fault exceeding the standard or reporting a specific fire cylinder and breaking the cylinder can be carried out.
s132, under the parallel operation mode, obtaining a judgment result of possible existence of a primary misfire fault according to the first condition, and switching to the series operation mode; here, the "first condition" means that the current misfire detection signal exceeds the first misfire detection threshold value. And a judgment result that the primary misfire fault exists is obtained when the second condition is satisfied, and step S133 is executed to output the misfire cylinder information and cut off the fuel injection command of the misfire cylinder.
If it is determined in both steps S31 and S32 that there is no primary misfire failure, step S134 is executed and no action is taken.
In the fire detection process, when the fire fault occurs in the parallel operation mode, the serial operation mode is switched to for further fire fault judgment, so that the false alarm possibly caused by the fluctuation of the rotating speed of the engine generated by the motor can be avoided, and the problem of unreliable fire judgment in the parallel mode that the engine and the motor are rigidly connected and jointly drive the vehicle can be effectively avoided; meanwhile, the misfire cylinder can be further confirmed by switching to the series operation mode, the information of the misfire cylinder can be accurately reported, and the cylinder is cut off, namely, the operations such as cutting off an oil injection instruction of the misfire cylinder are completed.
Preferably, the first condition is that the number of times that the current misfire detection signal exceeds a first misfire detection threshold value in a first detection period is greater than a first threshold value; the second condition is that the number of times the misfire detection signal currently exceeds the second misfire detection threshold value in the first detection period is larger than the second threshold value. For example, the first detection period is a statistical period of 400 ignitions, and if the detected misfire number exceeds the set number limit value, i.e., the first threshold value (parallel mode) and the second threshold value (series mode), in one period, it is considered that there is one cycle of severe misfire, i.e., a primary misfire failure. According to the arrangement, the degree of the fire fault is graded, and under the parallel operation mode, the switching to the series operation mode is carried out for further judgment only when the fire fault with higher severity degree occurs; such as a primary misfire fault having a number of misfire faults greater than a threshold value during a first sensing period, or a more severe secondary misfire fault.
here, the more serious "secondary misfire failure" means that, in the series operation mode, the judgment result of the presence of the secondary misfire failure is obtained in conformity with the third condition; the third condition is that the number of times that the current misfire detection signal exceeds the second misfire detection threshold value in a plurality of first detection cycles in succession is greater than the second threshold value. As in the previous example, when a severe misfire is detected for 2-3 consecutive cycles, the misfire is deemed severe enough for a secondary misfire fault that may cause catalyst damage.
Further, after the serial operation mode is switched, judging results of non-existence of the primary fire fault are obtained according to the condition that the second condition is not met, and the parallel operation mode is switched; and no longer switches to the series operating mode for the first length of time. That is, the non-misfire fault is detected again after the switching to the series operation mode, which belongs to the motor disturbance situation, and even if the misfire fault is detected again after the switching back to the parallel operation mode, the series request is not immediately sent, so that the reduction of the vehicle comfort caused by frequent mode switching is avoided.
with respect to a less severe misfire fault, it may be classified and treated as follows, respectively.
Acquiring a judgment result of the existence of the three-stage fire fault according to a fourth condition under a parallel operation mode when the three-stage fire fault exists; the fourth condition is that the number of times that the current misfire detection signal exceeds the first misfire detection threshold value in the second detection period is greater than a third threshold value; and the ignition frequency in the second detection period is greater than that in the first detection period. For example, the second detection period is a statistical period of 2000 firings, and if the number of detected misfires exceeds a set number limit value-a third threshold value within one period, it is considered that there is one-cycle light misfire, i.e., a three-stage misfire failure.
Acquiring a judgment result of the existence of the four-stage fire fault under the condition of meeting a fifth condition in a parallel operation mode; the fifth condition is that the number of times the misfire detection signal currently exceeds the first misfire detection threshold value within a plurality of the second detection periods in one driving cycle is larger than a third threshold value. As in the previous example, when a slight misfire is detected for 4 cycles of a driving cycle, the misfire is deemed to be of a degree that would cause emissions to be out of compliance, i.e., a four-level misfire fault.
The situations with lower severity, such as the three-level misfire fault, the four-level misfire fault and the like, only need to carry out the corresponding exhaust over-standard misfire fault. Is substantially the same as the prior art and will not be described herein.
In addition to the misfire detection method described above, the present embodiment provides an engine misfire detection system of a hybrid vehicle that executes the method, please refer to fig. 2, which is a functional block diagram of the engine misfire detection system. The system comprises a storage unit 21, an acquisition unit 22, a control unit 23 and an output unit 24.
The storage unit 21 is configured to store a first misfire detection threshold in the parallel mode and a second misfire detection threshold in the series mode;
Wherein, the acquiring unit 22 is used for acquiring a misfire detection signal;
the control unit 23, among others, determines the misfire failure based on the current operation mode, and specifically:
Under the series operation mode, a judgment result that a primary fire fault exists is obtained by meeting a second condition, and the information of the ignition cylinder and an oil injection instruction for cutting off the ignition cylinder are output through the output unit 24;
Under the parallel operation mode, obtaining a judgment result that a primary fire fault possibly exists according to the first condition, and switching to the series operation mode; judging results of primary fire faults are obtained according to the second condition, and the information of the fire cylinders and the fuel injection instructions of the fire cylinders are cut off through the output unit 24;
Wherein the first condition is that the current misfire detection signal exceeds a first misfire detection threshold; the second condition is that the misfire detection signal currently exceeds a second misfire detection threshold.
The embodiment also provides a hybrid vehicle hcu (hybrid) for processing the series operating mode and parallel operating mode requests issued by the engine misfire detection system as described above. In particular, the engine misfire detection system described above may be provided separately or may be integrated into the HCU described above.
example 2:
referring to fig. 3, fig. 3 is a flowchart illustrating an engine misfire detection method for a hybrid vehicle according to an embodiment of the present invention. The embodiment is used for fire fault detection in a parallel operation mode so as to accurately report the fire cylinders and reduce detection interference generated by the motor. The method specifically comprises the following steps:
And S31, presetting misfire detection thresholds in the parallel mode and the series mode.
the parallel mode is a first misfire detection threshold value, and the series mode is a second misfire detection threshold value; as in the first embodiment, the engine may be operated in each mode, a misfire may be simulated, the value of the misfire detection signal may be measured, and the threshold value in the corresponding mode may be set according to the value of the misfire detection signal.
s32, a misfire detection signal is acquired. And acquiring an engine rotating speed signal in real time to calculate to obtain a current misfire detection signal.
S33, under the parallel mode, obtaining the judgment result of possible primary fire fault according to the first condition, and switching to the series operation mode; here, the "first condition" means that the current misfire detection signal exceeds the first misfire detection threshold value.
And S34, obtaining a judgment result that the primary misfire fault exists according to the second condition, executing the step S35, and outputting the information of the ignition cylinder and an oil injection instruction for cutting off the ignition cylinder. The second condition means that the current fire detection signal exceeds a second fire detection threshold value in the series mode, and based on the characteristic that the series mode is slightly interfered by the rotating speed of the motor, the conventional treatment of reporting and discharging the fire fault exceeding the standard or reporting a specific fire cylinder and breaking the cylinder can be carried out.
If it is judged in step S33 that there is no primary misfire failure, step S36 is executed and no action is performed.
Also preferably, the first condition is that the number of times that the present misfire detection signal exceeds the first misfire detection threshold value in the first detection period is larger than a first threshold value; the second condition is that the number of times the misfire detection signal currently exceeds the second misfire detection threshold value in the first detection period is larger than the second threshold value. For example, the first detection period is a statistical period of 400 ignitions, and if the detected misfire number exceeds the set number limit value, i.e., the first threshold value (parallel mode) and the second threshold value (series mode), in one period, it is considered that there is one cycle of severe misfire, i.e., a primary misfire failure. According to the arrangement, the degree of the fire fault is graded, and under the parallel operation mode, the switching to the series operation mode is carried out for further judgment only when the fire fault with higher severity degree occurs; such as a primary misfire fault having a number of misfire faults greater than a threshold value during a first sensing period, or a more severe secondary misfire fault.
Here, the more serious "secondary misfire failure" means that, in the series operation mode, the judgment result of the presence of the secondary misfire failure is obtained in conformity with the third condition; the third condition is that the number of times that the current misfire detection signal exceeds the second misfire detection threshold value in a plurality of first detection cycles in succession is greater than the second threshold value. As in the previous example, when a severe misfire is detected for 2-3 consecutive cycles, the misfire is deemed severe enough for a secondary misfire fault that may cause catalyst damage.
Further, after the serial operation mode is switched, judging results of non-existence of the primary fire fault are obtained according to the condition that the second condition is not met, and the parallel operation mode is switched; and no longer switches to the series operating mode for the first length of time. That is, the non-misfire fault is detected again after the switching to the series operation mode, which belongs to the motor disturbance situation, and even if the misfire fault is detected again after the switching back to the parallel operation mode, the series request is not immediately sent, so that the reduction of the vehicle comfort caused by frequent mode switching is avoided.
With respect to a less severe misfire fault, it may be classified and treated as follows, respectively.
Acquiring a judgment result of the existence of the three-stage fire fault according to a fourth condition under a parallel operation mode when the three-stage fire fault exists; the fourth condition is that the number of times that the current misfire detection signal exceeds the first misfire detection threshold value in the second detection period is greater than a third threshold value; and the ignition frequency in the second detection period is greater than that in the first detection period. For example, the second detection period is a statistical period of 2000 firings, and if the number of detected misfires exceeds a set number limit value-a third threshold value within one period, it is considered that there is one-cycle light misfire, i.e., a three-stage misfire failure.
Acquiring a judgment result of the existence of the four-stage fire fault under the condition of meeting a fifth condition in a parallel operation mode; the fifth condition is that the number of times the misfire detection signal currently exceeds the first misfire detection threshold value within a plurality of the second detection periods in one driving cycle is larger than a third threshold value. As in the previous example, when a slight misfire is detected for 4 cycles of a driving cycle, the misfire is deemed to be of a degree that would cause emissions to be out of compliance, i.e., a four-level misfire fault.
The situations with lower severity, such as the three-level misfire fault, the four-level misfire fault and the like, only need to carry out the corresponding exhaust over-standard misfire fault. Is substantially the same as the prior art and will not be described herein.
It should be noted that the above-mentioned example provided by the present embodiment is not limited to the flowchart shown in fig. 1 and 3, and it should be understood that the core concept is within the scope of the present application as long as the core concept is consistent with the present solution to further judge the switching of the misfire fault with higher severity in the parallel mode to the series mode.
those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.
the foregoing is only a preferred embodiment of the present invention, and it should be noted that it is obvious to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and these modifications and improvements should also be considered as the protection scope of the present invention.
Claims (16)
1. an engine misfire detection method of a hybrid vehicle for a parallel operation mode, characterized by comprising the steps of:
Presetting a first misfire detection threshold value in a parallel mode and a second misfire detection threshold value in a series mode;
acquiring a misfire detection signal;
obtaining a judgment result that a primary fire fault possibly exists according to the first condition, and switching to a series operation mode; acquiring a judgment result of the existence of the primary fire fault by meeting a second condition, outputting fire cylinder information and cutting off an oil injection instruction of the fire cylinder;
Wherein the first condition is that the number of times that the current misfire detection signal exceeds a first misfire detection threshold value within a first detection period is greater than a first threshold value; the second condition is that the number of times the misfire detection signal currently exceeds the second misfire detection threshold value in the first detection period is larger than the second threshold value.
2. The engine misfire detection method of a hybrid vehicle according to claim 1, wherein after the switching to the series operation mode, a determination result that the primary misfire failure does not exist is obtained without satisfying a second condition, and the switching is made to the parallel operation mode; and no longer switches to the series operating mode for the first length of time.
3. The engine misfire detection method of a hybrid vehicle according to claim 1 or 2, wherein after the switching to the series operation mode, a judgment result of presence of the secondary misfire fault is obtained in conformity with a third condition; the third condition is that the number of times that the misfire detection signal currently exceeds the second misfire detection threshold value in a plurality of the first detection periods is continuously larger than the second threshold value.
4. The engine misfire detection method of a hybrid vehicle according to claim 3, wherein in the parallel operation mode, a determination result that there is a three-level misfire fault is obtained with satisfying a fourth condition; the fourth condition is that the number of times that the current misfire detection signal exceeds the first misfire detection threshold value in the second detection period is greater than a third threshold value; and the ignition frequency in the second detection period is greater than that in the first detection period.
5. The engine misfire detection method of a hybrid vehicle according to claim 4, wherein in the parallel operation mode, a determination result that the four-stage misfire fault exists is obtained with a fifth condition being satisfied; the fifth condition is that the number of times the misfire detection signal currently exceeds the first misfire detection threshold value within a plurality of the second detection periods in one driving cycle is larger than a third threshold value.
6. an engine misfire detection method of a hybrid vehicle, characterized by comprising the steps of:
presetting a first misfire detection threshold value in a parallel mode and a second misfire detection threshold value in a series mode;
Acquiring a misfire detection signal;
judging the misfire fault based on the current operation mode:
Under a series operation mode, acquiring a judgment result of the existence of the primary fire fault by meeting a second condition, outputting fire cylinder information and cutting off an oil injection instruction of the fire cylinder;
Under the parallel operation mode, obtaining a judgment result that a primary fire fault possibly exists according to the first condition, and switching to the series operation mode; acquiring a judgment result of the existence of the primary fire fault according to the second condition, outputting fire cylinder information and cutting off an oil injection instruction of the fire cylinder;
wherein the first condition is that the number of times that the current misfire detection signal exceeds a first misfire detection threshold value within a first detection period is greater than a first threshold value; the second condition is that the number of times the misfire detection signal currently exceeds the second misfire detection threshold value in the first detection period is larger than the second threshold value.
7. The engine misfire detection method of a hybrid vehicle according to claim 6, wherein after the switching to the series operation mode, switching to the parallel operation mode is performed with a judgment result that the primary misfire failure does not exist being obtained without satisfying the second condition; and no longer switches to the series operating mode for the first length of time.
8. the engine misfire detection method of a hybrid vehicle according to claim 6 or 7, wherein in the series operation mode, a judgment result that there is a secondary misfire fault is obtained in conformity with a third condition; the third condition is that the number of times that the misfire detection signal currently exceeds the second misfire detection threshold value in a plurality of the first detection periods is continuously larger than the second threshold value.
9. The engine misfire detection method of a hybrid vehicle according to claim 8, wherein in the parallel operation mode, a determination result that a three-level misfire fault exists is obtained with satisfying a fourth condition; the fourth condition is that the number of times that the current misfire detection signal exceeds the first misfire detection threshold value in the second detection period is greater than a third threshold value; and the ignition frequency in the second detection period is greater than that in the first detection period.
10. the engine misfire detection method of a hybrid vehicle according to claim 9, wherein in the parallel operation mode, a determination result that the four-stage misfire fault exists is obtained in a fifth condition being satisfied; the fifth condition is that the number of times the misfire detection signal currently exceeds the first misfire detection threshold value within a plurality of the second detection periods in one driving cycle is larger than a third threshold value.
11. An engine misfire detection system of a hybrid vehicle, characterized by comprising:
a storage unit for storing a first misfire detection threshold value in a parallel mode and a second misfire detection threshold value in a series mode;
An acquisition unit configured to acquire a misfire detection signal;
A control unit that performs misfire failure determination based on the current operation mode, wherein:
under a series operation mode, obtaining a judgment result of the existence of the primary fire fault by meeting a second condition, and outputting the information of the fire cylinders and cutting off the oil injection instructions of the fire cylinders through an output unit;
under the parallel operation mode, obtaining a judgment result that a primary fire fault possibly exists according to the first condition, and switching to the series operation mode; obtaining a judgment result of the existence of the primary fire fault by meeting a second condition, and outputting the information of the fire cylinder and cutting off an oil injection instruction of the fire cylinder through an output unit;
Wherein the first condition is that the number of times that the current misfire detection signal exceeds a first misfire detection threshold value within a first detection period is greater than a first threshold value; the second condition is that the number of times the misfire detection signal currently exceeds the second misfire detection threshold value in the first detection period is larger than the second threshold value.
12. the engine misfire detection system of a hybrid vehicle as recited in claim 11, wherein after the switching to the series operating mode, the control unit further switches to the parallel operating mode with a determination result that the first-stage misfire failure does not exist being obtained without satisfying the second condition; and no longer switches to the series operating mode for the first length of time.
13. The engine misfire detection system of a hybrid vehicle according to claim 11 or 12, wherein in the series operation mode, the control unit further obtains a judgment result that there is a secondary misfire fault in conformity with a third condition; the third condition is that the number of times that the misfire detection signal currently exceeds the second misfire detection threshold value in a plurality of the first detection periods is continuously larger than the second threshold value.
14. The engine misfire detection system of a hybrid vehicle as recited in claim 13, wherein the control unit further obtains a determination result that there is a three-level misfire fault at a fourth condition satisfied in the parallel operation mode; the fourth condition is that the number of times that the current misfire detection signal exceeds the first misfire detection threshold value in the second detection period is greater than a third threshold value; and the ignition frequency in the second detection period is greater than that in the first detection period.
15. The engine misfire detection system of a hybrid vehicle according to claim 14, wherein in the parallel operation mode, the control unit obtains a determination result that there is a four-stage misfire fault at a fifth condition being satisfied; the fifth condition is that the number of times the misfire detection signal currently exceeds the first misfire detection threshold value within a plurality of the second detection periods in one driving cycle is larger than a third threshold value.
16. Hybrid vehicle HCU characterized by handling series and parallel operating mode requests issued by an engine misfire detection system according to any of claims 11-15.
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| CN111156086A (en) * | 2020-01-09 | 2020-05-15 | 东风汽车集团有限公司 | Engine fire diagnosis system and method for hybrid electric vehicle |
| CN113074045A (en) * | 2021-04-22 | 2021-07-06 | 东风柳州汽车有限公司 | Engine misfire diagnosis method, engine misfire diagnosis device, engine misfire diagnosis equipment and storage medium |
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| CN114856809A (en) * | 2022-04-14 | 2022-08-05 | 江铃汽车股份有限公司 | Vehicle engine fire test method and device, storage medium and electronic equipment |
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| CN111156086A (en) * | 2020-01-09 | 2020-05-15 | 东风汽车集团有限公司 | Engine fire diagnosis system and method for hybrid electric vehicle |
| CN113074045A (en) * | 2021-04-22 | 2021-07-06 | 东风柳州汽车有限公司 | Engine misfire diagnosis method, engine misfire diagnosis device, engine misfire diagnosis equipment and storage medium |
| CN113202627A (en) * | 2021-05-28 | 2021-08-03 | 联合汽车电子有限公司 | Engine fire detection method and controller |
| CN114635795A (en) * | 2022-03-17 | 2022-06-17 | 东风汽车集团股份有限公司 | Fire monitoring method for hybrid electric vehicle and hybrid electric vehicle |
| CN114635795B (en) * | 2022-03-17 | 2023-09-19 | 东风汽车集团股份有限公司 | Method for monitoring fire of hybrid electric vehicle and hybrid electric vehicle |
| CN114856809A (en) * | 2022-04-14 | 2022-08-05 | 江铃汽车股份有限公司 | Vehicle engine fire test method and device, storage medium and electronic equipment |
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| CN115182813B (en) * | 2022-07-26 | 2023-10-20 | 东风汽车集团股份有限公司 | Engine misfire monitoring method of hybrid electric vehicle |
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