CN111361516A - Method for reminding vehicle maintenance - Google Patents
Method for reminding vehicle maintenance Download PDFInfo
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- CN111361516A CN111361516A CN201811604989.1A CN201811604989A CN111361516A CN 111361516 A CN111361516 A CN 111361516A CN 201811604989 A CN201811604989 A CN 201811604989A CN 111361516 A CN111361516 A CN 111361516A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
- B60R16/0234—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions related to maintenance or repairing of vehicles
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- Automation & Control Theory (AREA)
- Mechanical Engineering (AREA)
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Abstract
The invention provides a method for reminding vehicle maintenance, which is characterized in that the total intake mass in a period of time when an engine normally operates is obtained, the total intake mass is compared with a preset threshold value, and if the total intake mass is greater than or equal to the preset threshold value, one-time maintenance reminding is triggered. The real-time air inflow of the engine reflects the real-time working intensity of the engine, and the sum of the air inflow within a period of time in a normal running state reflects the working intensity of the engine within the period of time, so that the aging degree of parts such as engine oil and the like of the engine is reflected, therefore, the invention can accurately reflect the maintenance opportunity of the engine, improves the accuracy and reliability of vehicle reminding maintenance, and has the advantages of low modification difficulty and low cost, simple design, convenient realization and reliable running.
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 so, obtaining the total intake mass of the engine in a period of time under a normal operation state, judging whether the total intake mass is greater than or equal to a preset threshold value, and if so, reminding vehicle maintenance.
Alternatively, the total intake mass is obtained by integrating an intake mass airflow over a period of time during a normal operating state of the engine.
Optionally, when it is determined that the total intake mass is greater than or equal to the preset threshold, the engine controller controls a maintenance lamp to be turned on to remind of vehicle maintenance.
Optionally, the method for reminding vehicle maintenance further comprises:
after each time the vehicle is serviced, the current total intake mass is initialized to 0 and the vehicle servicing information is reset.
Optionally, when the operating state of the engine simultaneously satisfies the following conditions, it is determined that the engine is in a normal operating state:
the engine starting time is greater than a first calibration value;
the oil injection frequency in the current driving cycle is greater than a second calibration value;
the engine has no fault signal output;
the current rotational speed of the engine is greater than a third calibration value.
Optionally, the engine no-fault signal output comprises:
no fault signal is output for both the intake pressure and the intake temperature of the engine, or
The net output torque at the crankshaft end of the engine is greater than the fourth calibrated value.
Optionally, the first calibration value is 2 seconds.
Optionally, the total mass air charge is stored in a non-volatile memory in an engine controller when the total mass air charge over a period of time of the engine under normal operating conditions is obtained.
Optionally, the preset threshold is: M-M1B/S
Wherein: m is a preset threshold value; m1 is the total air intake mass after the vehicle has driven a certain mileage under the test condition; b is a maintenance interval; and S is a specific mileage.
Optionally, the vehicle is a hybrid vehicle.
According to the method for reminding vehicle maintenance, total intake mass in a period of time when an engine normally operates is obtained, the total intake mass is compared with a preset threshold value, and if the total intake mass is larger than or equal to the preset threshold value, one-time maintenance reminding is triggered. In view of the fact that the real-time air inflow of the engine reflects the real-time working strength of the engine, the sum of the air inflow in a period of time in the normal running state can reflect the working strength of the engine in the period of time, and further reflect the aging degree of parts such as engine oil of 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 reminding the vehicle maintenance.
In addition, the method for reminding vehicle maintenance utilizes the original air intake mass of the engine to obtain the total air intake mass and compares the total air intake mass with the preset threshold value to realize warning, so that additional parts are not needed, and the method has the advantages of low modification difficulty and low cost, is concise in design, convenient to realize and reliable in 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 integration over time of the intake mass flow rate 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 so, obtaining the total intake mass of the engine in a period of time under a normal operation state, judging whether the total intake mass is greater than or equal to a preset threshold value, and if so, 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 claims and this specification, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. As used in 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 total intake mass for a period of time of the engine in a normal operating state, and then performing step S3;
if not, continue to step S1;
step three S3: judging whether the total intake mass is greater than or equal to a preset threshold value;
if yes, go to 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 may be prompted in other manners, for example, a buzzer alarms or a short message is prompted through a big data platform, which is not limited in the present invention.
If not, repeatedly executing the step one S1, and continuously accumulating the air intake mass until the total air intake mass is greater than or equal to the preset threshold value;
step four S4: after one-time maintenance is finished, initializing the current total intake mass to be 0; at this time, step S52 is executed: the maintenance information of the vehicle is reset and the process returns to step S1, and then the next maintenance cycle is performed. 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 indicate that the maintenance is completed.
Generally, the intake mass of the engine can be accurately calibrated in the calibration stage of the engine pedestal, the intake mass is an original basic operation parameter of an engine control system, and if the intake mass is calculated, external parts are not required to be added, so that the cost of the additional parts is not increased, and the additional installation workload caused by the addition of the parts is also avoided. Calibration of the mass of the charge is readily accomplished by those skilled in the art using known techniques and will not be described further herein.
Meanwhile, the method for reminding the vehicle maintenance provided by the invention obtains the total intake mass in a period of time when the engine normally operates, compares the total intake mass with the preset threshold value, and triggers a maintenance reminding if the total intake mass is greater than or equal to the preset threshold value. Because the real-time air inflow of the engine reflects the real-time working intensity of the engine, the sum of the air inflow 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 parts such as engine oil of 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 reminding the vehicle maintenance.
In addition, the method for reminding vehicle maintenance calculates the inherent air intake mass of the engine and compares the inherent air intake mass with the preset threshold value to realize warning, has no additional added parts, has the advantages of low modification difficulty and low cost, and is simple in design, convenient to realize and reliable in operation.
In step S2, the total intake mass is obtained by integrating the intake mass flow rate of the engine in the normal operation state over a period of time, as shown in fig. 2, which is a schematic diagram of the integration of the intake mass flow rate of the engine over time, wherein the abscissa is the time T (unit, S) and the ordinate is the intake mass flow rate M1 (unit, kg/h).
Further, as shown in fig. 3, when the operating state of the engine simultaneously satisfies the following conditions, it is determined that the engine is in the normal operating state:
condition S11: the engine starting time is greater than a first calibration value;
condition S12: the oil injection frequency in the current driving cycle is greater than a second calibration value;
condition S13: the engine has no fault signal output;
condition S14: the current rotational speed of the engine is greater than a third calibration value.
The conditions S11, S12, S13 and S14 are anded, that is, if all of the conditions are satisfied, it is determined that the engine is in the normal operation state S10, and if any of the conditions is not satisfied, it is determined that the engine is in the abnormal operation state at this time.
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 air intake flow of the engine is unstable, so that the working conditions should be filtered. In addition, the first calibration value may be selectively set according to performance conditions of different engines, and for example, a starting time of 2 seconds is preferred as the first calibration value.
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, according to the condition S13, the configuration of different automobiles is divided into two cases: the first situation is that an automobile is provided with an air inlet pressure sensor and an air inlet temperature sensor, an air inlet pressure signal and an air inlet temperature signal are detected through the air inlet pressure sensor and the air inlet temperature sensor, and the calculation of air inlet quality directly depends on the signal values of the air inlet temperature sensor and the air inlet pressure sensor, and if the two sensors break down, the air inlet quality cannot be accurately calculated, so that the situation should be filtered out, and after the two faults occur, an Engine Controller (ECU) generally prompts a driver to maintain in a fault lamp lighting mode through an instrument without additionally setting a reminder; in the second case, the vehicle is not equipped with an intake pressure sensor and an intake temperature sensor but with a mass air flow sensor, and then the engine may be determined whether the engine has a fault by detecting the net output torque at the crankshaft end of the engine, and it may be determined that the engine has not a fault and normally outputs particularly when the net output torque is greater than a fourth calibrated value, where the fourth calibrated value may be selected according to the conditions of different engines, for example, when the engine runs at idle speed, the crankshaft end of the engine has a certain net output torque, and the fourth calibrated value may preferably be the net output torque at the crankshaft end during the idle speed running. Further, in order to increase the robustness of the integral enabling condition judgment, a condition S14 is set to filter out some extreme conditions, for example, the engine cannot work in an abnormal operating state such as an effective rotating speed due to other controller faults, and the third calibration value may be set according to different engine conditions.
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 the running-in period is finished, the output of other power sources (such as motors) is turned off through a controller interface in a development state, only the output power of an engine is kept to drive the vehicle to run, in this state, a specific mileage S (km) is driven under a representative test condition, and the total intake mass M1 of the engine under the specific mileage is obtained by integrating the intake mass flow of the engine. Then, the preset calibration threshold is: m is M1B/S; m is a preset threshold value; m1 is the total mass air charge at that particular mileage; b is a 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 intake mass threshold M1 at a specific mileage S is calibrated, and the total intake mass per kilometer is obtained by dividing M1 by S, i.e., the intake mass per kilometer, and further, the intake mass per kilometer is multiplied by a maintenance interval constant B to obtain the total intake mass for one maintenance period, which is preset as the threshold M, i.e., the threshold M can be used for comparing and judging the accumulated working strength of the engine. When the total air intake mass accumulated by the integral is larger than or equal to the preset threshold M, the fact that the running mileage of the vehicle driven by the independent output power of the engine reaches the set mileage of the maintenance interval B is indicated, and at the moment, an Engine Controller (ECU) sets an engine oil maintenance lamp control signal and directly outputs the engine 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 engine oil, an engine oil filter and an air filter.
Further, when a maintenance is completed, the maintenance service person re-initializes the current total intake air mass to 0 through 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, 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, in obtaining the total intake mass over a period of time during which the engine is operating normally, the total intake mass is actually stored in a non-volatile memory (NV) in an Engine Controller (ECU) to facilitate correct accumulation of the calculated intake mass per 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, according to the method for reminding vehicle maintenance provided by the invention, the total intake mass during a period of time when the engine normally operates is obtained, the total intake mass is compared with the preset threshold value, and if the total intake mass is greater than or equal to the preset threshold value, a maintenance reminding is triggered. The real-time air inflow of the engine reflects the real-time working intensity of the engine, and the sum of the air inflow in a period of time in a normal running state can reflect the working intensity of the engine in the period of time, so that the aging degree of parts such as engine oil of the engine is 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 reminding the vehicle maintenance.
In addition, the method for reminding vehicle maintenance utilizes the original air intake mass of the engine to obtain the total air intake mass and compares the total air intake mass with the preset threshold value so as to realize warning, so that additional parts are not needed, and the method has the advantages of low modification difficulty and low cost, is concise 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 so, obtaining the total intake mass of the engine in a period of time under a normal operation state, judging whether the total intake mass is greater than or equal to a preset threshold value, and if so, reminding vehicle maintenance.
2. A method for reminding vehicle maintenance as claimed in claim 1, characterized in that the total intake mass is obtained by integrating the intake mass flow over a period of time of the engine in a normal operating state.
3. The method for reminding vehicle maintenance of claim 1, wherein when it is determined that the total intake mass is greater than or equal to the preset threshold, an engine controller controls a maintenance lamp to be turned on to remind vehicle maintenance.
4. The method for reminding vehicle maintenance of claim 1, further comprising:
after each time the vehicle is serviced, the current total intake mass is initialized to 0 and the vehicle servicing information is reset.
5. The method for reminding vehicle maintenance according to claim 1, characterized in that the engine is judged to be in a normal operation state when the operation state of the engine simultaneously satisfies the following conditions:
the engine starting time is greater than a first calibration value;
the oil injection frequency in the current driving cycle is greater than a second calibration value;
the engine has no fault signal output;
the current rotational speed of the engine is greater than a third calibration value.
6. The method for reminding of vehicle maintenance of claim 5, wherein said engine no-fault signal output comprises:
no fault signal is output for both the intake pressure and the intake temperature of the engine, or
The net output torque at the crankshaft end of the engine is greater than the fourth calibrated value.
7. The method for reminding of vehicle maintenance of claim 5, wherein said first calibration value is 2 seconds.
8. The method for reminding of vehicle maintenance of claim 1, wherein the total mass air charge is stored in a non-volatile memory in an engine controller when the total mass air charge for a period of time of the engine under normal operating conditions is obtained.
9. The method for reminding vehicle maintenance of claim 1, wherein the preset threshold is: M-M1B/S
Wherein: m is a preset threshold value; m1 is the total air intake mass after the vehicle has driven a certain mileage under the test condition; b is a maintenance interval; and S is a specific mileage.
10. The method for reminding vehicle maintenance of claim 1, wherein the vehicle is a hybrid vehicle.
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| CN201811604989.1A CN111361516B (en) | 2018-12-26 | 2018-12-26 | Method for reminding vehicle maintenance |
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| CN201811604989.1A CN111361516B (en) | 2018-12-26 | 2018-12-26 | Method for reminding vehicle maintenance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114038083A (en) * | 2021-10-29 | 2022-02-11 | 东风商用车有限公司 | Intelligent maintenance reminding system of vehicle air inlet equipment |
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| Publication number | Publication date |
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| CN111361516B (en) | 2023-02-21 |
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