CN111365128A - Method for reminding vehicle maintenance - Google Patents
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- CN111365128A CN111365128A CN201811604983.4A CN201811604983A CN111365128A CN 111365128 A CN111365128 A CN 111365128A CN 201811604983 A CN201811604983 A CN 201811604983A CN 111365128 A CN111365128 A CN 111365128A
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- 238000012423 maintenance Methods 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000002485 combustion reaction Methods 0.000 claims abstract description 70
- 238000012360 testing method Methods 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000010705 motor oil Substances 0.000 abstract description 7
- 230000032683 aging Effects 0.000 abstract description 5
- 239000003921 oil Substances 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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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
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- Engineering & Computer Science (AREA)
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention provides a method for reminding vehicle maintenance, which comprises the steps of obtaining the total sum of combustion work of an engine in a period of time during normal operation, comparing the total sum of combustion work of the engine with a preset threshold value, and triggering a vehicle maintenance reminding if the total sum of combustion work of the engine is greater than or equal to the preset threshold value. The instantaneous power of the engine can better reflect the real-time working intensity of the engine, so that the total of the combustion work of the engine in a period of time in a normal running state reflects the working intensity of the engine in the period of time, and further reflects the aging degree of engine oil and other parts of the engine.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a method for reminding vehicle maintenance.
Background
Vehicles powered by a single internal combustion engine typically control the engine maintenance lights by simply identifying whether the mileage has reached a predetermined value (e.g., 5000 km). Due to the diversified working modes of the gasoline-electric hybrid electric vehicle, the working strength of the engine within the driving range of the preset value is difficult to simply judge, so that the control strategy of the engine maintenance lamp in the traditional mode is not applicable any more.
At present, there are several control modes for an engine maintenance lamp of a hybrid electric vehicle, and whether vehicle maintenance needs to be reminded is judged by judging whether one of the driving mileage, the total fuel consumption and the total number of engine running turns during the running period of an engine reaches a preset value. The defects are as follows: when the engine and the motor are driven jointly, the engine generally works at medium and large loads and medium and high rotating speeds, and if the operation parameters during the operation of the engine are simply judged, the risk of ageing of engine oil and engine oil filter of the engine cannot be eliminated, and the judgment accuracy is low.
Therefore, it is necessary to invent a new method for reminding vehicle maintenance to improve the accuracy of the maintenance reminding.
Disclosure of Invention
The invention aims to provide a method for reminding vehicle maintenance, which aims to solve the problem that the maintenance time of an engine is difficult to accurately reflect in a hybrid electric vehicle.
In order to solve the above technical problem, the present invention provides a method for reminding vehicle maintenance, comprising:
acquiring the running state of an engine, and judging whether the running state of the engine is a normal running state or not;
if yes, obtaining the total of the engine combustion work within a period of time under the normal operation state of the engine, judging whether the total of the engine combustion work is larger than or equal to a preset threshold value, and if yes, reminding vehicle maintenance.
Alternatively, the sum of the engine combustion work is obtained by integrating the instantaneous power of the engine over a period of time under normal operating conditions.
Optionally, the instantaneous power is: P-T n/9550
Wherein: p is the instantaneous power of the engine in the normal running state; t is instantaneous combustion torque of the engine in a normal running state; and n is the instantaneous rotating speed of the engine in the normal running state.
Optionally, the step of reminding vehicle maintenance includes: the engine controller controls the maintenance lamp to be turned on to remind the vehicle of maintenance.
Optionally, the method for reminding vehicle maintenance further comprises:
after the vehicle finishes maintenance once, the sum of the current engine combustion work is initialized to 0, and the vehicle maintenance information is reset.
Optionally, when the running state of the engine simultaneously satisfies a plurality of preset conditions, it is determined that the engine is in a normal running state, where the plurality of preset conditions include:
the current rotating speed of the engine is greater than a first calibration value;
the number of times of oil injection of the engine in the current driving cycle is greater than a second calibration value;
the engine has no fault signal output;
the net output torque at the crankshaft end of the engine continues to be greater than the third calibrated value.
Optionally, the engine no-fault signal output comprises: the engine has no misfire fault signal output.
Optionally, after obtaining the sum of the engine combustion work in a period of time in a normal operation state, storing the sum of the engine combustion work in a non-volatile memory in an engine controller.
Optionally, the preset threshold is: w0 ═ W1B/S
Wherein: w0 is the preset threshold; w1 is the sum of the engine combustion work after the vehicle has driven a certain distance under the test condition; b is a vehicle maintenance interval; and S is a specific mileage.
Optionally, the vehicle is a hybrid vehicle.
In summary, the method for reminding vehicle maintenance provided by the invention has the following beneficial effects:
firstly, the invention obtains the total of combustion work done in a period of time under the normal running state of the engine, compares the total of combustion work done by the engine with a preset threshold value, and triggers a vehicle maintenance prompt if the total of combustion work done by the engine is greater than or equal to the preset threshold value. Here, in view of that the instantaneous power of the engine in the normal operation state can better reflect the real-time working intensity of the engine, the total of the engine combustion work in a period of time in the normal operation state can reflect the working intensity of the engine in the period of time, and further accurately reflect the aging degree of the parts like the engine oil on the engine. Therefore, compared with the prior art, the method for reminding the vehicle maintenance can accurately reflect the maintenance time of the engine and improve the accuracy and reliability of the vehicle maintenance reminding.
Secondly, the invention obtains the total of the combustion work done by the engine in a period of time under the normal operation state by utilizing the inherent working parameters of the engine, and compares the total with the preset threshold value to realize the vehicle maintenance warning, thus the vehicle maintenance warning can be finished through program control without additionally adding parts, and the invention has the advantages of low modification difficulty and low cost, simple design, convenient realization and reliable operation.
Drawings
The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:
FIG. 1 is a schematic flow chart of a method for reminding vehicle maintenance in accordance with a preferred embodiment of the present invention;
FIG. 2 is a schematic diagram of the instantaneous power integration over time of an engine in accordance with a preferred embodiment of the present invention;
fig. 3 is a schematic diagram of the judgment condition that the engine is in the normal operation state according to the preferred embodiment of the present invention.
Detailed Description
The core idea of the invention is to provide a method for reminding vehicle maintenance, which comprises the following steps:
acquiring the running state of an engine, and judging whether the running state of the engine is a normal running state or not; if yes, obtaining the total of the combustion work of the engine in a period of time in a normal operation state, judging whether the total of the combustion work of the engine is larger than or equal to a preset threshold value, and if yes, reminding vehicle maintenance.
The method for reminding vehicle maintenance according to the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. And the advantages and features of the present invention will be more apparent from the following description.
It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. Further, the structures illustrated in the drawings are often part of actual structures. In particular, the drawings may have different emphasis points and may sometimes be scaled differently.
As used in the appended claims and this specification, the singular forms "a", "an" and "the" include plural referents unless the content clearly dictates otherwise. As used in the appended claims and this specification, the term "or" is generally employed in its sense including "and/or" unless the content clearly dictates otherwise.
Referring to fig. 1, a flow chart of a method for reminding vehicle maintenance according to a preferred embodiment of the invention is shown, which includes:
step one S1: acquiring the running state of an engine, and judging whether the running state of the engine is a normal running state or not;
if yes, go to step two S2: obtaining a sum of engine combustion work for a period of time during which the engine is in a normal operating state, and then performing step S3;
if not, continue to step S1;
step three S3: judging whether the sum of the combustion work of the engine is greater than or equal to a preset threshold value or not;
if the sum of the engine combustion work is greater than or equal to a preset threshold, executing step S51: reminding the vehicle of maintenance; specifically, the maintenance lamp can be controlled to be turned on by the engine controller to remind the vehicle of maintenance; optionally, the vehicle maintenance can be prompted in other manners, for example, a buzzer alarms or a large data platform is used for short message prompting, and the like, which is not limited in the invention;
if the sum of the engine combustion work is smaller than the preset threshold value, the step one S1 is repeatedly executed, and the engine combustion work is continuously accumulated until the sum of the engine combustion work is larger than or equal to the preset threshold value.
Further, the method further includes a step S4: after each time of vehicle maintenance, initializing the current sum of engine combustion work to 0, and executing step S52: the maintenance information of the vehicle is reset, and at the same time, the process returns to step S1 to enter the next maintenance period. Here, after the maintenance information of the vehicle is reset, the maintenance lamp may be controlled to be turned off by the engine controller to remind that the vehicle maintenance is completed.
Further, the sum of the engine combustion work may be obtained by integrating the instantaneous power of the engine over a period of time under normal operating conditions. Wherein the instantaneous power is:
P＝T*n/9550
p is the instantaneous power of the engine in the normal running state; t is instantaneous combustion torque of the engine in a normal running state; and n is the instantaneous rotating speed of the engine in the normal running state.
Generally, the combustion torque T and the instantaneous speed n of the engine can be accurately calibrated in the calibration stage of the engine bench, and those skilled in the art can easily calibrate the combustion torque and the instantaneous speed through the prior art, which is not described herein again. Therefore, the combustion torque T and the instantaneous speed n of the engine are basic operation parameters inherent to the engine control system, and if the combustion torque T and the instantaneous speed n are calculated, the sum of the instantaneous power P and the combustion work of the engine is obtained, and no external part is required to be added, so that the cost of additional parts is not increased, and no additional installation workload is brought by the addition of the parts.
Meanwhile, the invention obtains the total of combustion work done in a period of time when the engine normally operates, compares the total of combustion work done with a preset threshold value, and triggers a vehicle maintenance prompt if the total of combustion work done is greater than or equal to the preset threshold value. In view of the fact that the instantaneous power of the engine in the normal operation state can well reflect the real-time working intensity of the engine, the sum of the combustion work of the engine in a period of time in the normal operation state reflects the working intensity of the engine in the period of time, and therefore the aging degree of parts like engine oil on the engine is accurately reflected. Therefore, compared with the prior art, the method for reminding the vehicle maintenance can accurately reflect the maintenance time of the engine and improve the accuracy and reliability of the vehicle maintenance reminding. In addition, the method calculates the inherent combustion torque and the instantaneous rotating speed of the engine and compares the calculated torque with the preset threshold value to realize warning, has no additional parts, has the advantages of low reconstruction difficulty and low cost, and has the advantages of simple design, convenient realization and reliable operation.
Next, refer to FIG. 2, which is a schematic diagram of the integration of the instantaneous power of the engine over time, wherein the abscissa is time t (unit: s) and the ordinate is instantaneous power P (unit: watts). Therefore, in the embodiment of the present invention, the total work done by the engine combustion is obtained by integrating the instantaneous power of the engine in a period of time under the normal operation state, and the curve in the graph is the integral (W) of the engine combustion work, and the unit of the integral is joule (J). In practice, the instantaneous power P of the engine per unit time is multiplied by the unit time t to obtain the integral of the combustion work per unit time, and the integral of the combustion work per unit time is accumulated to obtain the total of the combustion work per unit time. The period of time is the accumulation of the unit times.
Further, as shown in fig. 3, when the operation state of the engine simultaneously satisfies a plurality of preset conditions, the engine may be determined to be in a normal operation state, where the plurality of preset conditions include:
condition S11: the current rotating speed of the engine is greater than a first calibration value;
condition S12: the number of times of oil injection of the engine in the current driving cycle is greater than a second calibration value;
condition S13: the engine has no fault signal output;
condition S14: the net output torque at the crankshaft end of the engine continues to be greater than the third calibrated value.
If the current operation state of the engine simultaneously meets the conditions S11, S12, S13 and S14, the engine is judged to be in a normal operation state S10, and if any one of the conditions is not met, the engine is judged to be in an abnormal operation state at the moment.
Condition S11 is used to determine whether the engine has achieved a valid operating condition, and avoid logging errors that occur during the start-up and shut-down of the engine. Generally, for a hybrid vehicle, starting and stopping of an engine often occur, and when the engine is just started, the operation of the engine is unstable, and the instantaneous power of the engine is unstable, so that the working conditions should be filtered. The first calibration value can be selected and set according to the performance conditions of different engines.
In addition, the condition S12 is set to avoid the situation that the engine has a rotation speed but does not start fuel injection and ignition and does not generate combustion when the controller is abnormal, and at this time, although the intake air flow rate exists, the engine does not generate combustion, so that the working condition is filtered, and the second calibration value can be set according to the actual situation.
Further, under the condition S13, a plurality of types of failure signals are output depending on the arrangement of the different automobiles. Preferably, the output of the no-fire fault signal can be realized, after the fire fault occurs, the engine generally shakes violently, the combustion torque and the instantaneous rotating speed of the engine deviate, and the instantaneous power cannot be accurately calculated, so that the situation is filtered, and after the fault occurs, the driver can feel abnormal and can go to a maintenance station to be overhauled as soon as possible without additionally setting a reminder because the engine generally shakes violently.
Further, in order to increase the robustness of the integral enabling condition judgment, a condition S14 is set to filter out some extreme working conditions; in a hybrid vehicle, the engine is generally used to charge the battery or provide additional power, and the operation condition that the engine crankshaft end outputs an external net output close to 0 torque is very little (basically meaningless), so that the crankshaft end net output torque of the engine is set to be continuously larger than a third calibration value, wherein the third calibration value can be set according to different engine conditions. In addition, the fact that the torque is continuously greater than the third calibration value means that the torque is still greater than the third calibration value after the time delay of the fourth calibration value after the net output torque at the crankshaft end of the engine is judged to be greater than the third calibration value. In addition, the net output torque of the crankshaft end of the engine can be accurately calibrated in the stage of the engine pedestal, and can be directly called without adding other sensors or parts.
Further, in the embodiment of the present invention, the preset threshold is obtained by calibration, and the specific calibration method includes: in the project development stage, for a vehicle after a break-in period is finished, the output of other power sources (such as motors) is closed through a controller interface in a development state, only the engine outputs power to drive the vehicle to run, in this state, a specific mileage S (km) is driven under a representative test condition, and the total W1 of the engine combustion work under the specific mileage is obtained by integrating the instantaneous power of the engine. In the embodiment of the present invention, the preset calibration threshold is: w0 ═ W1B/S;
w0 is a preset threshold; w1 is the sum of the engine combustion work after the vehicle has traveled the specified distance under the test condition; b is a vehicle maintenance interval; and S is a specific mileage.
The maintenance interval B is a constant set according to different engine or oil characteristics, for example, a semi-synthetic oil is selected, and the maintenance interval B may be set to 5000 km. The representative test condition here may be a constant speed driving state, or may be a WLTC emission test cycle that simulates an actual road condition, for example, a WLTC emission test cycle that is required by the state is performed in a mode in which the motor drive is turned off and only the engine output power is kept to drive the vehicle to run. The total W1 of the engine combustion work under a specific mileage S is calibrated, W1 is divided by S to obtain the work of the engine under a unit mileage, namely the work of the engine per kilometer, and further the work of the engine per kilometer is multiplied by a maintenance interval constant B to obtain the total of the engine combustion work of one maintenance period, and the total is preset as a threshold W0, so that the total W1 can be used for comparing and judging the accumulated working strength of the engine. When the total of the integrated and accumulated combustion work of the engine is greater than or equal to the preset threshold value W0, the fact that the running mileage of the vehicle driven by the engine independently outputting power reaches the set mileage of the maintenance interval B is indicated, and at the moment, an Engine Controller (ECU) sets an oil maintenance lamp control signal and directly outputs the oil maintenance lamp control signal to a vehicle instrument through a bus or a wire harness, so that a driver is reminded to replace and maintain the engine oil, the oil filter and the air filter.
Further, when a maintenance is completed, the maintenance service person re-initializes the current sum of the engine combustion work to 0 by a special operation of the diagnosis device or the meter, and resets the maintenance information of the vehicle (S52), at which time, the engine controller controls the maintenance lamp to be turned off to indicate that the maintenance is completed, and at which time, a maintenance cycle is completed. Then, the process returns to step S1, and the next maintenance cycle is performed by repeating the above steps.
Further, after obtaining the sum of the engine combustion work over a period of time in a normal operating state, it is preferable to store the sum of the engine combustion work in a non-volatile memory (NV) in an Engine Controller (ECU) in order to correctly accumulate the calculated intake air mass for each driving cycle.
In addition, the method for reminding the maintenance of the vehicle can be used for the traditional vehicle with a single internal combustion engine power source and can also be used for a gasoline-electric hybrid vehicle, so that when automobile manufacturers develop automobile control software, the unified control module can be used for both the hybrid power vehicle and the traditional vehicle with single power, and the production is convenient.
In summary, in the method for reminding vehicle maintenance provided by the invention, the sum of the combustion work of the engine in a period of time during normal operation is obtained, the sum of the combustion work is compared with the preset threshold, and if the sum of the combustion work is greater than or equal to the preset threshold, a vehicle maintenance reminding is triggered. In view of the fact that the instantaneous power of the engine in the normal running state can well reflect the real-time working intensity of the engine, the sum of the combustion work of the engine in a period of time in the normal running state can reflect the working intensity of the engine in the period of time, and further reflect the aging degree of parts like engine oil on the engine. Therefore, compared with the prior art, the method for reminding the vehicle maintenance can accurately reflect the maintenance time of the engine and improve the accuracy and reliability of the vehicle maintenance reminding.
In addition, the method for reminding vehicle maintenance utilizes the inherent parameters of the engine to obtain the total combustion work of the engine and compares the total combustion work with the preset threshold value so as to realize warning, so that additional parts are not needed, the method has the advantages of low modification difficulty and low cost, and is simple in design, convenient to realize and reliable in operation.
It should be noted that the above description is only for describing the preferred embodiments of the present invention, and not for limiting the scope of the present invention, and that any changes and modifications made by those skilled in the art in light of the above disclosure are all within the scope of the appended claims.
Claims (10)
1. A method for reminding vehicle maintenance, comprising:
acquiring the running state of an engine, and judging whether the running state of the engine is a normal running state or not;
if yes, obtaining the total of the engine combustion work within a period of time under the normal operation state of the engine, judging whether the total of the engine combustion work is larger than or equal to a preset threshold value, and if yes, reminding vehicle maintenance.
2. A method for reminding vehicle maintenance as in claim 1 wherein the sum of the engine combustion work is obtained by integrating the instantaneous power of the engine over a period of time under normal operating conditions.
3. The method for reminding of vehicle maintenance of claim 2, wherein said instantaneous power is: p ═ T × n/9550;
wherein: p is the instantaneous power of the engine in the normal running state; t is instantaneous combustion torque of the engine in a normal running state; and n is the instantaneous rotating speed of the engine in the normal running state.
4. A method for reminding vehicle maintenance according to any of claims 1 to 3, wherein the step of reminding vehicle maintenance comprises: the engine controller controls the maintenance lamp to be turned on to remind the vehicle of maintenance.
5. A method for reminding vehicle maintenance according to any of claims 1 to 3, further comprising:
and initializing the current sum of the combustion work of the engine to 0 after the vehicle finishes one maintenance every time, and resetting vehicle maintenance information.
6. A method for reminding vehicle maintenance according to any one of claims 1 to 3, characterized in that the engine is judged to be in a normal operation state when the operation state of the engine satisfies a plurality of preset conditions at the same time, the plurality of preset conditions including:
the current rotating speed of the engine is greater than a first calibration value;
the number of times of oil injection of the engine in the current driving cycle is greater than a second calibration value;
the engine has no fault signal output;
the net output torque at the crankshaft end of the engine continues to be greater than the third calibrated value.
7. The method for reminding of vehicle maintenance of claim 6, wherein said engine no-fault signal output comprises: the engine has no misfire fault signal output.
8. A method for alerting of vehicle maintenance as claimed in any one of claims 1 to 3, characterized in that after obtaining the sum of the engine combustion work over a period of time in normal operating conditions, the sum of the engine combustion work is stored in a non-volatile memory in an engine controller.
9. A method for reminding vehicle maintenance according to any of claims 1 to 3, characterized in that said preset threshold is: w0 ═ W1B/S
Wherein: w0 is the preset threshold; w1 is the sum of the work done by the combustion of the engine after the vehicle drives a specific mileage under the test condition; b is a vehicle maintenance interval; and S is a specific mileage.
10. A method for reminding vehicle maintenance according to any of claims 1 to 3, characterized in that the vehicle is a hybrid vehicle.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111930098A (en) * | 2020-07-28 | 2020-11-13 | 上海元城汽车技术有限公司 | Vehicle monitoring frequency diagnosis method and system |
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| US20160042576A1 (en) * | 2014-08-05 | 2016-02-11 | Myine Electronics, Inc. | Vehicle maintenance reminders |
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| CN106708352A (en) * | 2015-11-13 | 2017-05-24 | 北京奇虎科技有限公司 | Vehicle maintenance reminding method and mobile terminal |
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2018
- 2018-12-26 CN CN201811604983.4A patent/CN111365128B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20160042576A1 (en) * | 2014-08-05 | 2016-02-11 | Myine Electronics, Inc. | Vehicle maintenance reminders |
| CN106708352A (en) * | 2015-11-13 | 2017-05-24 | 北京奇虎科技有限公司 | Vehicle maintenance reminding method and mobile terminal |
| CN106254455A (en) * | 2016-08-03 | 2016-12-21 | 深圳市永兴元科技有限公司 | Vehicle maintenance prompting method and cloud server |
| CN106354938A (en) * | 2016-08-30 | 2017-01-25 | 潍柴动力股份有限公司 | Engine power classification method |
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