CN111140354B - Method and device for detecting fire of whole vehicle - Google Patents
Method and device for detecting fire of whole vehicle Download PDFInfo
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- CN111140354B CN111140354B CN201911329023.6A CN201911329023A CN111140354B CN 111140354 B CN111140354 B CN 111140354B CN 201911329023 A CN201911329023 A CN 201911329023A CN 111140354 B CN111140354 B CN 111140354B
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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
- F02B77/083—Safety, indicating or supervising devices relating to maintenance, e.g. diagnostic device
Abstract
The invention belongs to the technical field of vehicle engines, and particularly relates to a method and a control device for detecting fire of a whole vehicle. The invention discloses a method for detecting fire of a whole vehicle, which comprises the following steps: acquiring gear information and the current rotating speed of the engine, and determining teeth on an engine rotating speed signal panel corresponding to each cylinder according to the gear information and the current rotating speed of the engine; acquiring the time length for tooth rotation on the engine speed signal panel when the engine speed signal panel rotates for one period, and extracting a time length curve for tooth rotation of a corresponding order according to the time length for tooth rotation; comparing teeth on the engine speed signal panel corresponding to each cylinder with a time length curve to determine the response time length of each cylinder; and calculating the time deviation of each cylinder according to the response time of each cylinder, judging that the time deviation of each cylinder is greater than a preset deviation value, and determining that the current cylinder catches fire. The influence of the matching of the whole vehicle on the rotating speed phase is introduced, the influence of the gear of the whole vehicle is considered, and the accuracy of judging the cylinder when the fire is caught after the matching of the whole vehicle is improved.
Description
Technical Field
The invention belongs to the technical field of vehicle engines, and particularly relates to a method and a device for detecting fire of a whole vehicle.
Background
Fire catching: in the prior art, for an electric control engine, the phenomenon that a certain cylinder or a plurality of cylinders of the engine are not combusted due to open circuit of a driving pin, blockage of an oil injector, damage of an electromagnetic valve and the like is called fire. Most of the current engine misfire detection methods are identified by extracting an engine speed pulse signal and performing a series of processing.
The methods do not consider the influence of torsional resonance of the whole transmission shafting after matching of the whole vehicle. In fact, in vibration regions with different frequencies, the excitation and the response are not in the same phase, so that the phase of the engine speed pulse is not fixed, which directly influences the accuracy of the misfire judging cylinder. Different shafting match, and the resonance rotational speed is different, has further influenced the accuracy of firing and has judged the jar.
Disclosure of Invention
The invention aims to at least solve the problem that the accuracy of fire judging cylinders is influenced by different shafting matching and different resonance rotating speeds in the existing fire detecting method. The purpose is realized by the following technical scheme:
the invention provides a method for detecting fire of a whole vehicle, which comprises the following steps:
acquiring gear information and the current rotating speed of the engine, and determining teeth on an engine rotating speed signal panel corresponding to each cylinder according to the gear information and the current rotating speed of the engine;
acquiring the time length for tooth rotation on the engine speed signal panel when the engine speed signal panel rotates for one period, and extracting a time length curve for tooth rotation of a corresponding order according to the time length for tooth rotation;
comparing teeth on the engine speed signal panel corresponding to each cylinder with a time length curve to determine the response time length of each cylinder;
and calculating the time deviation of each cylinder according to the response time of each cylinder, judging that the time deviation of each cylinder is greater than a preset deviation value, and determining that the current cylinder catches fire.
According to the method for detecting the fire of the whole vehicle, the teeth on the engine rotating speed signal disc corresponding to each cylinder are determined according to the gear information and the current rotating speed of the engine, the teeth on the engine rotating speed signal disc corresponding to each cylinder are compared with the time length curve, the response time length of each cylinder is determined, the time deviation of each cylinder is calculated according to the response time length of each cylinder, the time deviation of each cylinder is larger than the preset deviation, the fire of the current cylinder is determined, the influence of the matching of the whole vehicle on the rotating speed phase is introduced, the influence of the gear of the whole vehicle is considered, and the accuracy of judging the fire of the cylinder after the whole vehicle is matched is improved.
In addition, the method for detecting the overall vehicle fire according to the invention can also have the following additional technical characteristics:
in some embodiments of the present invention, the determining the teeth on the engine speed signal panel corresponding to each cylinder according to the gear information and the current speed of the engine includes:
acquiring a resonance rotating speed;
and determining a phase difference according to the resonance rotating speed and the current rotating speed of the engine, and determining teeth on an engine rotating speed signal panel corresponding to each cylinder according to the phase difference.
In some embodiments of the invention, the acquiring the resonance rotation speed comprises:
acquiring parameters of a whole vehicle shafting;
and acquiring the resonance rotating speed according to the gear information and the parameters of the whole shafting.
In some embodiments of the present invention, the obtaining the resonance rotation speed according to the gear information and the parameters of the entire shafting includes:
and obtaining resonance frequency according to the parameters of the whole shafting, and obtaining resonance rotating speed through the resonance frequency.
In some embodiments of the invention, the parameters of the complete vehicle shafting are shafting rigidity, shafting inertia and resonance frequency f2Shafting stiffness/shafting inertia.
In some embodiments of the invention, the acquiring the resonance rotation speed comprises:
acquiring the current rotating speed of an engine in a finished automobile state;
and acquiring the resonance rotating speed according to the current rotating speed of the engine in the whole vehicle state.
In some embodiments of the present invention, said extracting a time duration curve for a corresponding order of tooth rotation according to a time duration for tooth rotation comprises:
a time length curve for tooth rotation corresponding to the time when the engine speed frequency is of the order of 0.5 is extracted from the time length for tooth rotation.
In some embodiments of the present invention, the calculating the time deviation of each cylinder according to the parameters of the entire shafting and the response time of each cylinder includes:
where Δ tiTo determine the corresponding order response time for each cylinder, i is 1-6.
In some embodiments of the invention, the engine speed signal panel is disposed at the front end or flywheel end.
The invention also provides a device for detecting the complete vehicle fire, wherein the device for detecting the complete vehicle fire is used for executing the method for detecting the complete vehicle fire, and the device comprises: an acquisition unit, a calculation unit and a judgment unit, wherein:
the acquisition unit is used for acquiring gear information and the current rotating speed of the engine, and the time length for rotating the teeth on the rotating speed signal panel of the engine when the rotating speed signal panel of the engine rotates for a period;
the calculating unit is used for determining teeth on an engine rotating speed signal panel corresponding to each cylinder according to the gear information and the current rotating speed of the engine, and extracting a time length curve for tooth rotation of a corresponding order according to the time length for tooth rotation; comparing teeth on the engine speed signal panel corresponding to each cylinder with a time length curve to determine the response time length of each cylinder; calculating the time deviation of each cylinder according to the response time length of each cylinder;
and the judging unit is used for judging that the time deviation of each cylinder is greater than the preset deviation value and determining that the current cylinder catches fire.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
FIG. 1 schematically illustrates a flow chart of a method for detecting an overall vehicle misfire according to an embodiment of the invention;
FIG. 2 schematically illustrates a logic control block diagram of a method of detecting an overall vehicle misfire according to an embodiment of the present invention;
FIG. 3 schematically shows an information acquisition diagram in a method for detecting a misfire in an entire vehicle according to an embodiment of the invention;
FIG. 4 schematically shows a block diagram of a detecting device for a misfire in an entire vehicle according to an embodiment of the invention.
1: an acquisition unit; 2: a calculation unit; 3: and a judging unit.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.
For convenience of description, spatially relative terms, such as "inner", "outer", "lower", "below", "upper", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" can include both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The invention provides a method for detecting the fire of a whole vehicle, which improves the accuracy of matching a fire judging cylinder of the whole vehicle.
As shown in fig. 1, the method for detecting a misfire in an entire vehicle in the embodiment includes the following steps:
s1, acquiring gear information and the current rotating speed of the engine rotating speed, and determining teeth on an engine rotating speed signal panel corresponding to each cylinder according to the gear information and the current rotating speed of the engine;
s2, acquiring the time length for tooth rotation on the engine speed signal panel (namely acquiring the time length of each tooth of a working cycle) when the engine speed signal panel rotates for a period, and extracting the time length curve for tooth rotation of the corresponding order according to the time length for tooth rotation;
s3, comparing teeth on the engine speed signal panel corresponding to each cylinder with a time length curve, and determining the response time length of each cylinder;
and S4, calculating the time deviation of each cylinder according to the response time of each cylinder, judging that the time deviation of each cylinder is greater than a preset deviation value, and determining that the current cylinder catches fire.
The engine speed signal panel has 60 teeth in one circle, and has 120 teeth in one cycle in two circles. Starting from the top dead center of one cylinder ignition, every 20 teeth are one cylinder and correspond to 1-5-3-6-2-4 respectively.
The equivalent inertia of a transmission shaft behind a clutch is not equal under different gears of the whole shafting, so that the resonance frequency of the whole shafting and the phase characteristics under each gear are different, and the gear is also required to be combined for judging the fire.
The influence of the matching of the whole vehicle on the rotating speed phase is introduced, and the influence of the gear of the whole vehicle is considered.
In some embodiments of the present invention, determining the teeth on the engine speed signal corresponding to each cylinder based on the gear information and the current speed of the engine comprises:
acquiring a resonance rotating speed;
and determining a phase difference according to the resonance rotating speed and the current rotating speed of the engine, and determining teeth on an engine rotating speed signal panel corresponding to each cylinder according to the phase difference.
In some embodiments of the invention, acquiring the resonant rotation speed comprises:
acquiring parameters of a whole vehicle shafting;
and acquiring the resonance rotating speed according to the gear information and the parameters of the whole shafting.
The phase difference simulates the phase difference of response and excitation through the parameters of a whole shafting system, and the corresponding angle range of one cylinder is determined by combining the peak point phase of the cylinder pressure data under each working condition, and the corresponding teeth of each cylinder are determined.
The corresponding teeth responded by each cylinder are obtained through a simulation mode, and the simulation mode is as follows: and acquiring accurate parameters of a shafting, and simulating a phase difference phi between response and excitation. By combining the peak point (excitation) phase theta of the cylinder pressure data under each working condition and taking the top dead center of the cylinder as a 0-degree starting point, the response angle range of the cylinder can be determined to be-60 degrees + theta + phi to +60 degrees + theta + phi. The other cylinders are sequentially increased by 120 degrees in the firing sequence. And determining the corresponding teeth of each cylinder according to the response angle range.
In some embodiments of the present invention, obtaining the resonance rotation speed according to the gear information and the parameters of the entire shafting includes:
and obtaining resonance frequency according to the parameters of the whole shafting, and obtaining resonance rotating speed through the resonance frequency.
In some embodiments of the invention, the parameters of the whole shafting are shafting rigidity, shafting inertia and resonance frequency f2Shafting stiffness/shafting inertia.
In some embodiments of the invention, acquiring the resonant rotation speed comprises:
acquiring the current rotating speed of an engine in a finished automobile state;
and acquiring the resonance rotating speed according to the current rotating speed of the engine in the whole vehicle state.
The phase difference is obtained by acquiring the rotating speed response data of a certain cylinder state of the engine, the phase of the cylinder of the corresponding order is obtained, the corresponding angle range of one cylinder is determined, and the corresponding teeth of each cylinder are determined. The influence of matching of the whole vehicle on the rotating speed phase is considered, and an extremely important factor influencing the accuracy of misfire identification is introduced.
The corresponding teeth of each cylinder response are acquired through the whole vehicle rotating speed acquisition, and the whole vehicle rotating speed acquisition is as follows: collecting the speed response data of the engine in the state of breaking a cylinder to obtain the phase of the cylinder in the corresponding order
The cylinder top dead center is used as a 0-degree starting point to determine a cylinder response angle range
The other cylinders are sequentially increased by 120 degrees in the firing sequence. And determining the corresponding tooth number of each cylinder according to the response angle range.
In some embodiments of the present invention, extracting a time duration curve for a corresponding order of tooth rotation based on a time duration for tooth rotation comprises:
a time length curve for tooth rotation corresponding to the time when the engine speed frequency is of the order of 0.5 is extracted from the time length for tooth rotation.
After the single cylinder is on fire, the 0.5-order rotation speed fluctuation is the largest component, so that the 0.5-order of the time length fluctuation of each tooth is extracted for processing, and the influence of other-order resonance can be avoided.
In some embodiments of the present invention, calculating the time deviation of each cylinder according to the entire shafting parameter and the response time of each cylinder includes:
where Δ tiTo determine the corresponding order response time for each cylinder, i is 1-6.
And calculating the time of each tooth, and extracting a 0.5-order time curve. Determining the 0.5 order response time Deltat of each cylinder according to the active teeth (total 20 teeth) of each cylinderiFor example, an inline six-cylinder machine with the firing order of 153624, i is 1,5,3,6,2, 4.
Thirdly, calculating the time deviation of each cylinder
According to a preset threshold value a0When is alphai>α0If yes, judging that the cylinder is on fire, otherwise, judging that no fire is on.
In some embodiments of the invention, the engine speed signal panel is disposed at a front or flywheel end.
The 0.5 order component is far away from the torsional resonance frequency of the crankshaft and is slightly influenced by torsional vibration, so that the rotating speed signal can be obtained from the front end. And the two steps are combined to obtain the product.
As shown in fig. 3, the misfire collection information needs to collect the rotational speed information and the gear information of the engine. The engine rotating speed information can be obtained from a front-end rotating speed signal panel and also can be obtained from a flywheel end. The gear information may be obtained from a vehicle control module. After the ECU acquires the rotating speed information and the gear information, the misfire judgment can be output through the misfire strategy processing.
The invention also provides a device for detecting the complete vehicle fire, wherein the device for detecting the complete vehicle fire is used for executing the method for detecting the complete vehicle fire, and the device comprises the following components: an acquisition unit 1, a calculation unit 2 and a judgment unit 3, wherein:
the system comprises an acquisition unit 1, a control unit and a control unit, wherein the acquisition unit 1 is used for acquiring gear information and the current rotating speed of the rotating speed of an engine, and the time length for rotating teeth on an engine rotating speed signal panel when the engine rotating speed signal panel rotates for a period;
the calculating unit 2 is used for determining teeth on an engine rotating speed signal panel corresponding to each cylinder according to the gear information and the current rotating speed of the engine, and extracting a time length curve for tooth rotation of a corresponding order according to the time length for tooth rotation; comparing teeth on the engine speed signal panel corresponding to each cylinder with a time length curve to determine the response time length of each cylinder; calculating the time deviation of each cylinder according to the response time length of each cylinder;
and the judging unit 3 is used for judging that the time deviation of each cylinder is greater than the preset deviation value and determining that the current cylinder catches fire.
In the control method of the electronic fan in the vehicle, the influence of matching of the whole vehicle on the rotating speed phase is considered, and an extremely important factor influencing the accuracy of fire identification is introduced. The influence of the gear of the whole vehicle is considered, and the accuracy of fire identification is further improved. And only 0.5-order time length fluctuation is extracted for fire recognition, so that the interference after other orders of excited resonance is avoided, and the accuracy of fire recognition is ensured. The signals at the front end and the rear end of the engine can be used and are not influenced by the torsional vibration of the crankshaft. The time length of each cylinder is directly compared, and the algorithm is simple and efficient.
In summary, in the method for detecting the fire of the whole vehicle, the teeth on the engine speed signal panel corresponding to each cylinder are determined according to the gear information and the current speed of the engine, the teeth on the engine speed signal panel corresponding to each cylinder are compared with the time length curve, the response time length of each cylinder is determined, the time deviation of each cylinder is calculated according to the response time length of each cylinder, the time deviation of each cylinder is greater than the preset deviation, the fire of the current cylinder is determined, the influence of the matching of the whole vehicle on the speed phase is introduced, the influence of the gear of the whole vehicle is considered, and the accuracy of judging the cylinders after the fire of the whole vehicle is matched is improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The method for detecting the complete vehicle fire is characterized by comprising the following steps:
acquiring gear information and the current rotating speed of the engine, and acquiring a resonance rotating speed according to the current rotating speed of the engine in the state of the whole vehicle, or acquiring the resonance rotating speed according to the gear information and the shafting parameters of the whole vehicle;
determining a phase difference according to the resonance rotating speed and the current rotating speed of the engine, acquiring rotating speed response data of a certain cylinder state of the engine to obtain the phase of the cylinder in a corresponding order, determining a corresponding angle range of the cylinder, and determining teeth on an engine rotating speed signal panel corresponding to each cylinder;
or simulating the phase difference between response and excitation through the parameters of the whole shafting, determining the corresponding angle range of one cylinder by combining the peak point phase of the cylinder pressure data under each working condition, and determining the corresponding teeth of each cylinder;
acquiring the time length for tooth rotation on the engine speed signal panel when the engine speed signal panel rotates for one period, and extracting a time length curve for tooth rotation of a corresponding order according to the time length for tooth rotation;
comparing teeth on the engine speed signal panel corresponding to each cylinder with a time length curve to determine the response time length of each cylinder;
and calculating the time deviation of each cylinder according to the response time of each cylinder, judging that the time deviation of each cylinder is greater than a preset deviation value, and determining that the current cylinder catches fire.
2. The method for detecting the vehicle misfire according to claim 1, wherein the obtaining of the resonance rotation speed according to the gear information and the vehicle shafting parameters comprises:
and obtaining resonance frequency according to the parameters of the whole shafting, and obtaining resonance rotating speed through the resonance frequency.
3. The method for detecting misfire in a whole vehicle as recited in claim 2, wherein the parameters of the shafting of the whole vehicle are shafting stiffness and shafting inertia, and resonance frequency f2Shafting stiffness/shafting inertia.
4. The vehicle misfire detection method as recited in claim 1, wherein the extracting a time length curve for tooth rotation of a corresponding order according to the time length for tooth rotation includes:
a time length curve for tooth rotation corresponding to the time when the engine speed frequency is of the order of 0.5 is extracted from the time length for tooth rotation.
5. The method for detecting the misfire of the whole vehicle as recited in claim 1, wherein the calculating the time deviation of each cylinder according to the shafting parameters of the whole vehicle and the response time of each cylinder comprises:
where Δ tiTo determine the corresponding order response time for each cylinder, i is 1-6.
6. The vehicle fire detection method according to claim 1, wherein the engine speed signal panel is arranged at a front end or a flywheel end.
7. A device for detecting a misfire in a whole vehicle, the device for detecting a misfire in a whole vehicle being adapted to perform the method for detecting a misfire in a whole vehicle according to any one of claims 1 to 6, the device comprising: an acquisition unit, a calculation unit and a judgment unit, wherein:
the acquisition unit is used for acquiring gear information and the current rotating speed of the engine, and the time length for rotating the teeth on the rotating speed signal panel of the engine when the rotating speed signal panel of the engine rotates for a period;
the calculating unit is used for determining teeth on an engine rotating speed signal panel corresponding to each cylinder according to the gear information and the current rotating speed of the engine, and extracting a time length curve for tooth rotation of a corresponding order according to the time length for tooth rotation; comparing teeth on the engine speed signal panel corresponding to each cylinder with a time length curve to determine the response time length of each cylinder; calculating the time deviation of each cylinder according to the response time length of each cylinder;
and the judging unit is used for judging that the time deviation of each cylinder is greater than the preset deviation value and determining that the current cylinder catches fire.
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| CN113202626B (en) * | 2021-05-24 | 2022-06-07 | 东风商用车有限公司 | Engine misfire detection method, device, equipment and readable storage medium |
| CN113202627B (en) * | 2021-05-28 | 2022-09-06 | 联合汽车电子有限公司 | Engine fire detection method and controller |
| CN114622991B (en) * | 2022-03-18 | 2023-07-18 | 潍柴动力股份有限公司 | Engine misfire judging method, engine and vehicle |
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