CN118700794B - A Fault Diagnosis System for Automobile Air Conditioning System - Google Patents
A Fault Diagnosis System for Automobile Air Conditioning System Download PDFInfo
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- CN118700794B CN118700794B CN202411188109.2A CN202411188109A CN118700794B CN 118700794 B CN118700794 B CN 118700794B CN 202411188109 A CN202411188109 A CN 202411188109A CN 118700794 B CN118700794 B CN 118700794B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 28
- 238000003745 diagnosis Methods 0.000 title claims abstract description 13
- 230000000694 effects Effects 0.000 claims abstract description 43
- 238000012544 monitoring process Methods 0.000 claims abstract description 38
- 238000001816 cooling Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 15
- 230000008569 process Effects 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 6
- 230000008439 repair process Effects 0.000 description 5
- 238000005057 refrigeration Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000029305 taxis Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00978—Control systems or circuits characterised by failure of detection or safety means; Diagnostic methods
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/002—Thermal testing
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
本发明涉及汽车空调系统领域，公开了一种适用于汽车空调系统的故障诊断系统，包括监测模块和分析模块，所述监测模块包括车内监测单元和车外监测单元；所述车内监测单元获取车内人数、车内各空调出风口的出风速度和车内温度；车外监测单元获取车外温度；通过设置在车内的车内监测单元监测车内状态，获得车内人数、车内各空调出风口的出风速度和车内温度；通过设置在车外的车外监测单元监测车外状态，获得车外温度；通过分析模块对车内人数、车内空调各出风口的出风速度、车内温度和车外温度进行分析，并根据分析结果判断车内制冷效果差是否是空调故障引起；减少对引起空调制冷效果差原因的误判，也及时在空调故障时发出预警，及时进行检修。
The invention relates to the field of automobile air-conditioning systems, and discloses a fault diagnosis system suitable for automobile air-conditioning systems, comprising a monitoring module and an analysis module, wherein the monitoring module comprises an in-car monitoring unit and an out-car monitoring unit; the in-car monitoring unit obtains the number of people in the car, the air outlet speed of each air-conditioning outlet in the car, and the in-car temperature; the out-car monitoring unit obtains the outside-car temperature; the in-car monitoring unit arranged in the car monitors the in-car state to obtain the number of people in the car, the air outlet speed of each air-conditioning outlet in the car, and the in-car temperature; the out-car monitoring unit arranged outside the car monitors the outside-car state to obtain the outside-car temperature; the analysis module analyzes the number of people in the car, the air outlet speed of each air-conditioning outlet in the car, the in-car temperature, and the outside-car temperature, and judges whether the poor cooling effect in the car is caused by the air-conditioning failure according to the analysis result; reduces the misjudgment of the cause of the poor cooling effect of the air-conditioning, and timely issues an early warning when the air-conditioning fails, and performs maintenance in time.
Description
Technical Field
The invention relates to the field of automobile air conditioning systems, in particular to a fault diagnosis system suitable for an automobile air conditioning system.
Background
With the improvement of living standard, the requirements of people on living environment temperature are gradually improved, so that the automobile air conditioner plays a vital role in modern automobiles; the automobile air conditioner can improve the comfort level of personnel in the automobile, ensure the driving safety and purify the air in the automobile; an air conditioning system with good performance is also one of the important manifestations of vehicle quality.
In general, the cooling effect of an air conditioner of an automobile is evaluated through subjective feeling of personnel in the automobile, and when the personnel in the automobile feel that the cooling effect of the air conditioner is poor, the cooling effect is mostly considered to be caused by the failure of the air conditioner, and a car owner can choose to continue enduring or send to a repair shop for maintenance.
However, the poor air-conditioning refrigeration effect is probably not caused by air-conditioning faults, but is caused by other external factors such as outdoor temperature, and the like, so that a person in the vehicle is difficult to judge the specific reason of the poor air-conditioning refrigeration effect, if the vehicle owner chooses to continue tolerance, the poor air-conditioning refrigeration effect is caused by the air-conditioning faults, and the air-conditioning faults are gradually serious due to untimely repair, so that later repair cost is higher; if the car owner sends the car to a repair shop for maintenance, but the poor air-conditioning refrigeration effect is caused by other external factors such as outdoor temperature and the like, a great deal of time and repair fees are wasted, especially for operating taxis.
Disclosure of Invention
The invention aims to provide a fault diagnosis system suitable for an automobile air conditioning system, which solves the following technical problems:
how to judge whether the poor refrigerating effect in the vehicle is caused by the air conditioner fault.
The aim of the invention can be achieved by the following technical scheme:
a fault diagnosis system suitable for an automotive air conditioning system, comprising:
the monitoring module comprises an in-vehicle monitoring unit and an out-of-vehicle monitoring unit;
The in-vehicle monitoring unit is arranged in the vehicle and used for monitoring the in-vehicle state and acquiring in-vehicle information data; the information data in the vehicle comprises the number of people in the vehicle, the air outlet speed of each air conditioner outlet in the vehicle and the temperature in the vehicle;
the vehicle exterior monitoring unit is arranged outside the vehicle, and is used for monitoring the state outside the vehicle and acquiring vehicle exterior information data; the vehicle exterior information data comprises vehicle exterior temperature;
the analysis module is used for analyzing the number of people in the vehicle, the air outlet speed of each air outlet of the air conditioner in the vehicle, the temperature in the vehicle and the temperature outside the vehicle, and judging whether the poor refrigerating effect in the vehicle is caused by the air conditioner fault according to the analysis result.
As a further scheme of the invention: the in-vehicle monitoring unit comprises anemometers arranged at air outlets of all air conditioners, cameras arranged in the vehicle and temperature sensors arranged in the vehicle.
As a further scheme of the invention: the analysis process of the analysis module is as follows:
s1: the temperature influence coefficient is obtained by analyzing the temperature outside the vehicle and the temperature inside the vehicle;
S2: the wind speed influence coefficient is obtained by analyzing the wind speed of each air outlet in the vehicle;
s3: the number of people in the vehicle is analyzed to obtain an artificial influence coefficient;
S4: the method comprises the steps of analyzing an artificial influence coefficient, a temperature influence coefficient and a wind speed influence coefficient to obtain a preset time length when the temperature in the vehicle is reduced to a temperature set by a user;
S5: analyzing the preset time length when the temperature in the vehicle is reduced to the user set temperature and the time length when the temperature is actually reduced to the user set temperature, and judging whether the poor refrigerating effect in the vehicle is caused by the air conditioner fault or not; if the air conditioner fault is judged to be caused, sending out an early warning; otherwise, the poor refrigerating effect in the vehicle is not caused by the air conditioner fault, and the vehicle continues to work.
As a further scheme of the invention: in step S1, the temperature influence coefficient is represented by the formula:
calculating to obtain temperature influence coefficient ；
Wherein, The moment when the air conditioner is started; Is a preset time period; Is a curve of the temperature outside the vehicle along with time; the temperature is preset outside the vehicle; Is the coefficient of the unit removal; is a first preset constant; Is a second preset constant; a third preset constant; Setting a temperature for a user; presetting a standard temperature in a vehicle; Is a first weight coefficient; is a second weight coefficient; is a third weight coefficient; opening air conditioner for vehicle real-time temperature at time; The preset temperature is the preset temperature when the air conditioner is started in the vehicle.
As a further scheme of the invention: in step S2, the wind speed influence coefficient is represented by the formula:
calculating to obtain wind speed influence coefficient ；
Wherein, A fourth preset constant; the actual wind speed change curve of the kth air conditioner air outlet along with time is adopted; The method comprises the steps of presetting wind speed for an air outlet of an air conditioner; Is the total number of air outlets of the air conditioner in the vehicle.
As a further scheme of the invention: in step S3, the artificial influence coefficient is represented by the formula:
Calculating to obtain artificial influence coefficient ；
Wherein, Is the actual number of people in the vehicle; Presetting the number of people in the vehicle; a fifth preset constant.
As a further scheme of the invention: in step S4, the preset duration for the temperature in the vehicle to drop to the temperature set by the user is as follows:
Obtaining preset time length for the temperature in the vehicle to be reduced to the temperature set by a user ；
Wherein, To the outside temperature is the preset outside temperatureThe temperature is preset when the air conditioner is started in the vehicleThe wind speed of the air outlet of each air conditioner is a preset wind speedThe number of people in the car is the number of people preset in the carThe temperature in the vehicle is reduced to the preset standard temperature in the vehicleIs set for a preset time period; is a fourth weight coefficient; Is a fifth weight coefficient; And is the sixth weight coefficient.
As a further scheme of the invention: in step S5, the determination process for determining whether the in-vehicle cooling effect difference is caused by an air conditioner failure is:
by the formula Obtaining a judgment factor；
Wherein, As a judging function, whenIn the time-course of which the first and second contact surfaces,; When (when)In the time-course of which the first and second contact surfaces,；Time for turning on air conditionerThe actual time length from the moment when the temperature in the vehicle is reduced to the temperature set by the user; Is an allowable error range;
When (when) When the vehicle interior refrigerating effect is poor and is not caused by the air conditioner fault, the vehicle interior refrigerating effect is continuous to work;
When (when) When the vehicle interior refrigerating effect is poor, the air conditioner is caused by faults, overhauling is needed, and early warning is sent out.
The invention has the beneficial effects that:
(1) The invention monitors the state in the vehicle through the in-vehicle monitoring unit arranged in the vehicle to obtain the number of people in the vehicle, the air outlet speed of each air conditioner outlet in the vehicle and the temperature in the vehicle; the method comprises the steps of monitoring the state outside a vehicle through an outside monitoring unit arranged outside the vehicle to obtain the outside temperature; analyzing the number of people in the vehicle, the air outlet speed of each air outlet of the air conditioner in the vehicle, the temperature in the vehicle and the temperature outside the vehicle by an analysis module, and judging whether the poor refrigerating effect in the vehicle is caused by air conditioner faults or not according to analysis results; the misjudgment on the cause of poor refrigerating effect of the air conditioner is reduced, and early warning is sent out in time when the air conditioner fails, so that maintenance is carried out in time;
(2) The invention is as follows Temperature coefficient of influenceThe greater the time the temperature in the vehicle falls to the preset time period for the user to set the temperatureThe larger; when (when)Wind speed influence coefficientThe greater the time the temperature in the vehicle falls to the preset time period for the user to set the temperatureThe larger; when (when)When the artificial influence coefficientThe greater the time the temperature in the vehicle falls to the preset time period for the user to set the temperatureThe larger; by the formulaMore accurately obtaining the preset time length when the temperature in the vehicle is reduced to the temperature set by the user；
(3) The invention is thatA time difference value between a preset time length when the temperature in the vehicle is reduced to the user set temperature and an actual time length when the temperature in the vehicle is reduced to the user set temperature; The absolute value of the time difference between the preset time length when the temperature in the vehicle is reduced to the user set temperature and the actual time length when the temperature in the vehicle is reduced to the user set temperature; if it is When the absolute value of the time difference between the preset time period when the temperature in the vehicle is reduced to the user set temperature and the actual time period when the temperature in the vehicle is reduced to the user set temperature is within the allowable error range, thereforeThe poor refrigerating effect in the vehicle is not caused by the air conditioner fault, and the vehicle continues to work; if it isWhen the absolute value of the time difference between the preset time period for the temperature in the vehicle to drop to the user set temperature and the actual time period for the time point for the temperature in the vehicle to drop to the user set temperature exceeds the allowable error range, thereforePoor refrigerating effect in the vehicle is caused by air conditioner faults, and the vehicle needs to be overhauled to send out early warning.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a block diagram of a system module according to one embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, in one embodiment, a fault diagnosis system suitable for an air conditioning system of an automobile is provided, the fault diagnosis system comprising:
the monitoring module comprises an in-vehicle monitoring unit and an out-of-vehicle monitoring unit;
The in-vehicle monitoring unit is arranged in the vehicle and used for monitoring the in-vehicle state and acquiring in-vehicle information data; the information data in the vehicle comprises the number of people in the vehicle, the air outlet speed of each air conditioner outlet in the vehicle and the temperature in the vehicle;
the vehicle exterior monitoring unit is arranged outside the vehicle, and is used for monitoring the state outside the vehicle and acquiring vehicle exterior information data; the vehicle exterior information data comprises vehicle exterior temperature;
The analysis module is used for analyzing the number of people in the vehicle, the air outlet speed of each air outlet of the air conditioner in the vehicle, the temperature in the vehicle and the temperature outside the vehicle, and judging whether the poor refrigerating effect in the vehicle is caused by the air conditioner fault according to the analysis result;
According to the technical scheme, the in-vehicle monitoring unit is arranged in the vehicle to monitor the in-vehicle state, so that the number of people in the vehicle, the air outlet speed of each air conditioner outlet in the vehicle and the temperature in the vehicle are obtained; the method comprises the steps of monitoring the state outside a vehicle through an outside monitoring unit arranged outside the vehicle to obtain the outside temperature; analyzing the number of people in the vehicle, the air outlet speed of each air outlet of the air conditioner in the vehicle, the temperature in the vehicle and the temperature outside the vehicle by an analysis module, and judging whether the poor refrigerating effect in the vehicle is caused by air conditioner faults or not according to analysis results; the misjudgment on the cause of poor refrigerating effect of the air conditioner is reduced, and early warning is sent out in time when the air conditioner fails, so that maintenance is carried out in time.
As one embodiment of the invention, the in-vehicle monitoring unit comprises an anemometer arranged at an air outlet of each air conditioner, a camera arranged in the vehicle and a temperature sensor arranged in the vehicle;
Through the technical scheme, the air outlet speed of each air conditioner air outlet can be obtained through the anemometer arranged at each air conditioner air outlet; the number of people in the vehicle can be obtained through a camera arranged in the vehicle; the in-vehicle temperature may be obtained by a temperature sensor provided in the vehicle.
As one embodiment of the present invention, the analysis module includes:
s1: the temperature influence coefficient is obtained by analyzing the temperature outside the vehicle and the temperature inside the vehicle;
S2: the wind speed influence coefficient is obtained by analyzing the wind speed of each air outlet in the vehicle;
s3: the number of people in the vehicle is analyzed to obtain an artificial influence coefficient;
S4: the method comprises the steps of analyzing an artificial influence coefficient, a temperature influence coefficient and a wind speed influence coefficient to obtain a preset time length when the temperature in the vehicle is reduced to a temperature set by a user;
S5: analyzing the preset time length when the temperature in the vehicle is reduced to the user set temperature and the time length when the temperature is actually reduced to the user set temperature, and judging whether the poor refrigerating effect in the vehicle is caused by the air conditioner fault or not; if the air conditioner fault is judged to be caused, sending out an early warning; otherwise, the poor refrigerating effect in the vehicle is not caused by the air conditioner fault, and the vehicle continues to work.
Through the technical scheme, the analysis module of the embodiment obtains the temperature influence coefficient by analyzing the temperature outside the vehicle and the temperature inside the vehicle; analyzing the air outlet velocity of each air outlet in the vehicle to obtain an air velocity influence coefficient; then, the preset time length when the temperature in the vehicle is reduced to the temperature set by a user is obtained by analyzing the artificial influence coefficient, the temperature influence coefficient and the wind speed influence coefficient; finally, analyzing the preset time length when the temperature in the vehicle is reduced to the user set temperature and the time length when the temperature is actually reduced to the user set temperature, and judging whether the poor refrigerating effect in the vehicle is caused by the air conditioner fault or not; if the air conditioner fault is judged to be caused, sending out an early warning; otherwise, the poor refrigerating effect in the vehicle is not caused by the air conditioner fault, and the vehicle continues to work; the misjudgment on the cause of poor refrigerating effect of the air conditioner is reduced, and early warning is sent out in time when the air conditioner fails, so that maintenance is carried out in time.
As an embodiment of the present invention, in step S1, the temperature influence coefficient is represented by the formula:
calculating to obtain temperature influence coefficient ；
Wherein, The moment when the air conditioner is started; Is a preset time period; Is a curve of the temperature outside the vehicle along with time; the temperature is preset outside the vehicle; Is the coefficient of the unit removal; is a first preset constant; Is a second preset constant; a third preset constant; Setting a temperature for a user; presetting a standard temperature in a vehicle; Is a first weight coefficient; is a second weight coefficient; is a third weight coefficient; opening air conditioner for vehicle real-time temperature at time; opening air conditioner for vehicle a preset temperature at that time;
through the technical scheme, the embodiment The average outside temperature in a preset time period after the moment of starting the air conditioner is set; a first temperature difference value between the average outside temperature and the outside preset temperature within a preset time period after the moment of starting the air conditioner; the larger the first temperature difference value is, the larger the influence on the preset time period when the temperature in the vehicle is reduced to the user-set temperature is, and thus the temperature influence coefficient is The larger; for the second temperature difference value between the real-time temperature when the air conditioner is started in the vehicle and the preset temperature, the larger the second temperature difference value is, the larger the influence on the preset time period when the temperature in the vehicle is reduced to the temperature set by the user is, so that the temperature influence coefficient is larger The larger; A third temperature difference value between a preset standard temperature and a user-set temperature in the vehicle; the larger the third temperature difference is, the larger the influence on the preset time period when the temperature in the vehicle is reduced to the user-set temperature is, and thus the temperature influence coefficient is The larger;
it should be noted that the number of the substrates, preset time period ; Outdoor environment preset temperatureCoefficient of de-unityA first preset constantA second preset constantA third preset constantPreset standard temperaturePreset temperature when opening air conditioner in carFirst weight coefficientSecond weight coefficientAnd a third weight coefficientIs obtained empirically for the preset value and is not described in detail herein.
As an embodiment of the present invention, in step S2, the wind speed influence coefficient is represented by the formula:
calculating to obtain wind speed influence coefficient ；
Wherein, A fourth preset constant; the actual wind speed change curve of the kth air conditioner air outlet along with time is adopted; The method comprises the steps of presetting wind speed for an air outlet of an air conditioner; the total number of air outlets of the air conditioner in the vehicle;
through the technical scheme, the embodiment The accumulated air quantity of a kth air conditioner air outlet in a unit time within a preset time period after the moment of starting the air conditioner is set; the method comprises the steps that the actual accumulated air quantity of K air conditioner air outlets in a preset time period after the moment of starting the air conditioner is set; For the preset accumulated air quantity of K air-conditioning outlets in a preset time period after the moment of starting the air conditioner The air quantity difference value between the preset accumulated air quantity and the actual accumulated air quantity of the K air conditioner air outlets in the preset time period after the moment of starting the air conditioner is set; the method comprises the steps that the average difference value of the estimated accumulated air quantity and the actual accumulated air quantity of K air-conditioner air outlets in a preset time period after the moment of starting the air-conditioner is set; the larger the average air volume difference value is, the larger the influence on the preset time period when the temperature in the vehicle is reduced to the temperature set by the user is, so that the wind speed influence coefficient is The larger;
It should be noted that the number of the substrates, fourth preset constant And the preset wind speed of the air outlet of the air conditionerIs obtained empirically for the preset value and is not described in detail herein.
As an embodiment of the present invention, in step S3, the artificial influence coefficient is represented by the formula:
Calculating to obtain artificial influence coefficient ；
Wherein, Is the actual number of people in the vehicle; Presetting the number of people in the vehicle; A fifth preset constant;
through the technical scheme, the embodiment The difference value between the actual number of people in the vehicle and the preset number of people in the vehicle; the larger the difference of the number of people is, the larger the influence on the preset time period when the temperature in the vehicle is reduced to the temperature set by the user is, thus the artificial influence coefficient isThe larger;
The number of people preset in the vehicle And a fifth preset constantIs obtained empirically for the preset value and is not described in detail herein.
As an embodiment of the present invention, in step S4, the preset duration for the temperature in the vehicle to drop to the user-set temperature is as follows:
Obtaining preset time length for the temperature in the vehicle to be reduced to the temperature set by a user ；
Wherein, To the outside temperature is the preset outside temperatureThe temperature is preset when the air conditioner is started in the vehicleThe wind speed of the air outlet of each air conditioner is a preset wind speedThe number of people in the car is the number of people preset in the carThe temperature in the vehicle is reduced to the preset standard temperature in the vehicleIs set for a preset time period; is a fourth weight coefficient; Is a fifth weight coefficient; Is a sixth weight coefficient;
Through the technical scheme, the embodiment is as follows Temperature coefficient of influenceThe greater the time the temperature in the vehicle falls to the preset time period for the user to set the temperatureThe larger; when (when)Wind speed influence coefficientThe greater the time the temperature in the vehicle falls to the preset time period for the user to set the temperatureThe larger; when (when)When the artificial influence coefficientThe greater the time the temperature in the vehicle falls to the preset time period for the user to set the temperatureThe larger; by the formulaMore accurately obtaining the preset time length when the temperature in the vehicle is reduced to the temperature set by the user；
It should be noted that the number of the substrates, fourth weight coefficientFifth weight coefficientAnd a sixth weight coefficientPreset time lengthIs obtained empirically for the preset value and is not described in detail herein.
In step S5, as an embodiment of the present invention, a determination process for determining whether or not the in-vehicle cooling effect difference is caused by an air conditioner failure is:
by the formula Obtaining a judgment factor；
Wherein, As a judging function, whenIn the time-course of which the first and second contact surfaces,; When (when)In the time-course of which the first and second contact surfaces,；Time for turning on air conditionerThe actual time length from the moment when the temperature in the vehicle is reduced to the temperature set by the user; Is an allowable error range;
When (when) When the vehicle interior refrigerating effect is poor and is not caused by the air conditioner fault, the vehicle interior refrigerating effect is continuous to work;
When (when) When the vehicle interior refrigerating effect is poor, the air conditioner is caused by faults, and the vehicle interior refrigerating effect needs to be overhauled, and an early warning is sent;
through the technical scheme, the embodiment A time difference value between a preset time length when the temperature in the vehicle is reduced to the user set temperature and an actual time length when the temperature in the vehicle is reduced to the user set temperature; The absolute value of the time difference between the preset time length when the temperature in the vehicle is reduced to the user set temperature and the actual time length when the temperature in the vehicle is reduced to the user set temperature; if it is When the absolute value of the time difference between the preset time period when the temperature in the vehicle is reduced to the user set temperature and the actual time period when the temperature in the vehicle is reduced to the user set temperature is within the allowable error range, thereforeThe poor refrigerating effect in the vehicle is not caused by the air conditioner fault, and the vehicle continues to work; if it isWhen the absolute value of the time difference between the preset time period for the temperature in the vehicle to drop to the user set temperature and the actual time period for the time point for the temperature in the vehicle to drop to the user set temperature exceeds the allowable error range, thereforeThe poor refrigerating effect in the vehicle is caused by the failure of the air conditioner, and the vehicle needs to be overhauled to send out early warning;
the time when the air conditioner was turned on was noted Actual length of time to when the in-vehicle temperature falls to the user-set temperatureThe acquisition mode of (1) is the prior art; allowable error rangeIs obtained empirically for the preset value and is not described in detail herein.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (4)
1. A fault diagnosis system adapted for use in an automotive air conditioning system, said fault diagnosis system comprising:
the monitoring module comprises an in-vehicle monitoring unit and an out-of-vehicle monitoring unit;
The in-vehicle monitoring unit is arranged in the vehicle and used for monitoring the in-vehicle state and acquiring in-vehicle information data; the information data in the vehicle comprises the number of people in the vehicle, the air outlet speed of each air conditioner outlet in the vehicle and the temperature in the vehicle;
the vehicle exterior monitoring unit is arranged outside the vehicle, and is used for monitoring the state outside the vehicle and acquiring vehicle exterior information data; the vehicle exterior information data comprises vehicle exterior temperature;
The analysis module is used for analyzing the number of people in the vehicle, the air outlet speed of each air outlet of the air conditioner in the vehicle, the temperature in the vehicle and the temperature outside the vehicle, and judging whether the poor refrigerating effect in the vehicle is caused by the air conditioner fault according to the analysis result;
The analysis process of the analysis module is as follows:
s1: the temperature influence coefficient is obtained by analyzing the temperature outside the vehicle and the temperature inside the vehicle;
S2: the wind speed influence coefficient is obtained by analyzing the wind speed of each air outlet in the vehicle;
s3: the number of people in the vehicle is analyzed to obtain an artificial influence coefficient;
S4: the method comprises the steps of analyzing an artificial influence coefficient, a temperature influence coefficient and a wind speed influence coefficient to obtain a preset time length when the temperature in the vehicle is reduced to a temperature set by a user;
S5: analyzing the preset time length when the temperature in the vehicle is reduced to the user set temperature and the time length when the temperature is actually reduced to the user set temperature, and judging whether the poor refrigerating effect in the vehicle is caused by the air conditioner fault or not; if the air conditioner fault is judged to be caused, sending out an early warning; otherwise, the poor refrigerating effect in the vehicle is not caused by the air conditioner fault, and the vehicle continues to work;
in step S1, the temperature influence coefficient is represented by the formula:
；
calculating to obtain temperature influence coefficient ；
Wherein, The moment when the air conditioner is started; Is a preset time period; Is a curve of the temperature outside the vehicle along with time; the temperature is preset outside the vehicle; Is the coefficient of the unit removal; is a first preset constant; Is a second preset constant; a third preset constant; Setting a temperature for a user; presetting a standard temperature in a vehicle; Is a first weight coefficient; is a second weight coefficient; is a third weight coefficient; opening air conditioner for vehicle real-time temperature at time; opening air conditioner for vehicle a preset temperature at that time;
In step S2, the wind speed influence coefficient is represented by the formula:
；
calculating to obtain wind speed influence coefficient ；
Wherein, A fourth preset constant; the actual wind speed change curve of the kth air conditioner air outlet along with time is adopted; The method comprises the steps of presetting wind speed for an air outlet of an air conditioner; the total number of air outlets of the air conditioner in the vehicle;
in step S3, the artificial influence coefficient is represented by the formula:
；
Calculating to obtain artificial influence coefficient ；
Wherein, Is the actual number of people in the vehicle; Presetting the number of people in the vehicle; a fifth preset constant.
2. The fault diagnosis system for an air conditioning system of a vehicle according to claim 1, wherein the in-vehicle monitoring unit includes an anemometer provided at an outlet of each air conditioner, a camera provided in the vehicle, and a temperature sensor provided in the vehicle.
3. The fault diagnosis system according to claim 1, wherein in step S4, the preset time period for the temperature in the vehicle to drop to the user-set temperature is represented by the following formula:
；
Obtaining preset time length for the temperature in the vehicle to be reduced to the temperature set by a user ；
Wherein, To the outside temperature is the preset outside temperatureThe temperature is preset when the air conditioner is started in the vehicleThe wind speed of the air outlet of each air conditioner is a preset wind speedThe number of people in the car is the number of people preset in the carThe temperature in the vehicle is reduced to the preset standard temperature in the vehicleIs set for a preset time period; is a fourth weight coefficient; Is a fifth weight coefficient; And is the sixth weight coefficient.
4. A fault diagnosis system for use in an air conditioning system of a vehicle according to claim 3, wherein in step S5, the judging process for judging whether the in-vehicle cooling effect is poor due to an air conditioning fault is:
by the formula Obtaining a judgment factor；
Wherein, As a judging function, whenIn the time-course of which the first and second contact surfaces,; When (when)In the time-course of which the first and second contact surfaces,；Time for turning on air conditionerThe actual time length from the moment when the temperature in the vehicle is reduced to the temperature set by the user; Is an allowable error range;
When (when) When the vehicle interior refrigerating effect is poor and is not caused by the air conditioner fault, the vehicle interior refrigerating effect is continuous to work;
When (when) When the vehicle interior refrigerating effect is poor, the air conditioner is caused by faults, overhauling is needed, and early warning is sent out.
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