CN114013242B - Intelligent calibration method for automatic air conditioning system of automobile - Google Patents
Intelligent calibration method for automatic air conditioning system of automobile Download PDFInfo
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- CN114013242B CN114013242B CN202111409636.8A CN202111409636A CN114013242B CN 114013242 B CN114013242 B CN 114013242B CN 202111409636 A CN202111409636 A CN 202111409636A CN 114013242 B CN114013242 B CN 114013242B
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004378 air conditioning Methods 0.000 title claims abstract description 16
- 230000001052 transient effect Effects 0.000 claims abstract description 27
- 238000004134 energy conservation Methods 0.000 claims abstract description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 6
- 206010063385 Intellectualisation Diseases 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000001816 cooling Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Classifications
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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
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention relates to the technical field of automobile intellectualization, and discloses an intelligent calibration method of an automatic air conditioning system of an automobile, which comprises a transient intelligent calibration method and a steady intelligent calibration method, wherein the transient calibration is judged by transient indexes, and the steady intelligent calibration step comprises the steps of recording the ambient temperature, the temperature in the automobile and the reading of a sunlight sensor; presetting an in-vehicle temperature; calculating the net heat energy entering the automobile cabin; and calculating heat energy dissipated from the cabin shell by using energy conservation, further calculating to obtain a heat conductivity UA value, and calculating a steady-state environment power curve according to the UA value to realize steady-state environment calibration. According to the invention, the loop mode and drive test time is reduced, and automatic intelligent calibration is completed through data processing of the sensor and the HVAC system.
Description
Technical Field
The invention relates to the technical field of automobile intellectualization, in particular to an intelligent calibration method of an automatic air conditioning system of an automobile.
Background
Operation of an automotive automatic air conditioning system may be divided into two phases, transient and steady state operation. The goal of transient phase control is to quickly adjust the passenger cabin from an initial uncomfortable condition to a predetermined comfortable condition. After this goal is achieved, the control objective is shifted to steady state control that maintains comfort as ambient temperature or solar load changes.
In the existing transient stage control process, obtaining initial parameters of an instantaneous passenger cabin of an automobile when the automobile is started through a sensor on the automobile, and performing transient control by using a high-power heating or cooling method when the initial parameters are larger than the preset temperature of the passenger cabin of the automobile; and when the temperature of the passenger cabin reaches the preset temperature, the control is switched to the steady-state stage control.
When the passenger cabin is in a stable control state, the heat energy flowing into the passenger cabin and the heat energy flowing out of the passenger cabin are in an equilibrium state.
The existing calibration process is generally two to three weeks of environment simulation laboratory tests and two to three weeks of road tests, so that the automobile can complete transient and steady state control evaluation and optimization under as many environmental conditions as possible, and the optimal control calibration is obtained, thereby meeting the requirements of automobile factory technical indexes.
Disclosure of Invention
The invention aims to solve the problems, and provides an intelligent calibration method for an automatic air conditioning system of an automobile, which reduces the loop model and drive test time and completes automatic calibration through data processing of a sensor and an HVAC system.
The technical scheme adopted by the invention is as follows:
an intelligent calibration method for an automatic air conditioning system of an automobile is characterized by comprising a transient intelligent calibration method and a steady intelligent calibration method,
the transient calibration is judged by a transient index theta, and the formula is as follows:
wherein T is i For the temperature of the passenger compartment of the vehicle, T i,0 For initial passenger compartment temperature, T s Setting a temperature for the passenger cabin, wherein the temperature is at a starting point of a transient state when the value of theta is 1.0, and at an ending point of the transient state when the value of theta is 0;
wherein steady-state calibration comprises the steps of:
(1) Recording the ambient temperature, the in-vehicle temperature, and the sun sensor readings;
(2) Presetting an in-vehicle temperature, and running an automobile HVAC system until reaching a stable state, wherein the in-vehicle measured temperature reaches the preset temperature, and the difference between the preset temperature and the ambient temperature is more than 10 ℃;
(3) The net heat energy into the automobile cabin is calculated by the following formula:
wherein the method comprises the steps ofT is the air flow from the HVAC system dis T is the average value of the air temperature measured on the discharge duct s The temperature in the vehicle is preset; c (C) p Specific heat for air;
(4) According to the net heat energy entering the automobile cabin in a steady state, including the air conditioning box exhaust heat and the sunlight heat, the heat energy dissipated from the cabin shell should be equal to the heat exchange energy conservation formula as follows:
wherein UA is thermal conductivity, T amb In order to be at the temperature of the environment,is a solar thermal load;
obtained from formula (c):
(5) According to the formula:
calculating a steady-state environment power curve to realize steady-state environment calibration, wherein T is as follows std The temperature is set for the in-vehicle standard.
Further, in the step (1), the temperature in the vehicle is a temperature reported by an in-vehicle sensor or a temperature detected by an in-vehicle head thermocouple.
Further, the measurement process of each parameter is performed in a state where the vehicle is traveling at a constant speed or is stopped.
Further, by repeating steps (1) to (4) at different temperature levels, a plurality of UA values are obtained, and an average value of the plurality of UA values is subjected to calculation of an environmental power curve.
Further, the optimal temperature T in the vehicle in the step (5) std ＝24℃。
The beneficial effects of the invention are as follows:
(1) Through intelligent calibration, the development cost is reduced by reducing, even canceling the ring mould and road test calibration;
(2) Communication time between departments is reduced, and delivery speed of the vehicle is improved;
(3) The intelligent steady-state calibration can be combined with the existing annular die method, so that the quick and accurate calibration can be realized.
Drawings
FIG. 1 is a schematic diagram of transient and steady state control phases;
FIG. 2 is a schematic diagram of an ambient power calibration curve.
Detailed Description
The following describes the specific embodiment of the intelligent calibration method of the automatic air conditioning system of the automobile in detail.
In the transient operation stage of the automatic air conditioning system of the automobile, a transient control process is identified through a transient index.
The transient index is defined based on parameters of the passenger cabin head temperature, and is calculated by the formula (a):
wherein T is i For passenger compartment temperature, T i,0 For initial passenger compartment temperature, T s A temperature is set for the passenger compartment. At the zero point immediately after the transient cooling or heating process, the value of θ is 1.0, and at the end of the transient process, when the cabin temperature reaches the preset temperature T s When θ has a value of 0. Thus, the value of θ is itself an indicator of how far the cabin is from steady state control conditions. When the value of θ is 0, the transient control phase is deemed to be ended, and the system goes to steady state control.
Referring to fig. 1, the transient cooling or heating process ends from the beginning to time t1, and at time t1, the cabin temperature substantially reaches the preset temperature, and a steady-state control phase begins.
Referring to fig. 2, in a steady state control state of the passenger cabin, the thermal energy flowing into the passenger cabin and the thermal energy flowing out of the passenger cabin are in equilibrium, and the steady state ambient power is calibrated to achieve a desired HVAC power versus ambient temperature relationship to maintain the cabin temperature at a nominal control set point (e.g., 24 ℃). This relationship, known as the cabin heat load curve, is closely related to the cabin type, such as a car or SUV, minivan, and is typically a linear curve, possibly affected by mode switching, forming an S-shaped curve in the middle, which is still linear near both ends.
In the prior art, calibration is performed through long-time environmental simulation laboratory test and simulation and actual road test, and the curve shape is similar to that of fig. 2.
The steady-state calibration method of the invention is as follows:
in the steady-state control phase, the calibration process comprises the following steps:
(1) Ambient temperature, in-vehicle temperature, and sun sensor readings are recorded. The temperature in the vehicle is measured by a temperature sensor in the vehicle or a special head thermocouple and recorded to the system. The net heat energy delivery from the air conditioner to the passenger compartment is calculated by recording the air conditioner discharge temperature and mass flow and discharge pattern. The measuring process is carried out under the state that the automobile runs at a constant speed or stops, and the environment power curve is determined based on the cloudy day sunlight-free environment.
(2) An in-vehicle temperature is preset, the automobile HVAC system is operated until a steady state is reached, at which time the in-vehicle temperature reaches a set temperature. The difference between the preset temperature and the ambient temperature is greater than 10 ℃;
(3) The net heat energy into the automobile cabin is calculated by the following formula:
wherein the method comprises the steps ofT is the air flow from the HVAC system dis T is the average value of the air temperature measured on the discharge duct s The temperature in the vehicle is preset; c (C) p Specific heat for air;
(4) According to the net heat energy entering the car cabin in steady state should be equal to the heat energy dissipated from the cabin shell, the formula is as follows:
wherein UA is thermal conductivity, T amb Is ambient temperature, obtained from formula (c):
(5) According to the formula:
calculating a steady-state environment power curve to realize steady-state environment calibration, wherein T is as follows std For the in-vehicle standard set temperature, 24 ℃ is usually adopted as the optimal temperature in the vehicle.
Steps (1) through (4) may be repeated at the same ambient temperature, or at different ambient temperatures, at different temperature levels above or below ambient temperature to obtain multiple UA data. And calculating an environment power curve by using an average value of a plurality of values to improve the accuracy of the environment power curve.
By the steady-state calibration method, the calculated power curve is close to that of the attached figure 2, and the calibration accuracy is completely met. On the basis, the calibration time and the limitation on the calibration conditions of a laboratory and a road test are greatly reduced, and the purposes of saving development time and cost are achieved.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (5)
1. An intelligent calibration method for an automatic air conditioning system of an automobile is characterized by comprising the following steps of: comprises a transient intelligent calibration method and a steady intelligent calibration method,
the transient calibration is judged by a transient index theta, and the formula is as follows:
wherein T is i For the temperature of the passenger compartment of the vehicle, T i,0 For initial passenger compartment temperature, T s Setting a temperature for the passenger cabin, wherein the temperature is at a starting point of a transient state when the value of theta is 1.0, and at an ending point of the transient state when the value of theta is 0;
wherein steady-state calibration comprises the steps of:
(1) Recording the ambient temperature, the in-vehicle temperature, and the sun sensor readings;
(2) Presetting an in-vehicle temperature, and running an automobile HVAC system until reaching a stable state, wherein the in-vehicle measured temperature reaches the preset temperature, and the difference between the preset temperature and the ambient temperature is more than 10 ℃;
(3) The net heat energy into the automobile cabin is calculated by the following formula:
wherein the method comprises the steps ofT is the air flow from the HVAC system dis T is the average value of the air temperature measured on the discharge duct s The temperature in the vehicle is preset; c (C) p Specific heat for air;
(4) According to the net heat energy entering the automobile cabin in a steady state, including the air conditioning box exhaust heat and the sunlight heat, the heat energy dissipated from the cabin shell should be equal to the heat exchange energy conservation formula as follows:
wherein UA is thermal conductivity, T amb In order to be at the temperature of the environment,is a solar thermal load;
obtained from formula (c):
(5) According to the formula:
calculating a steady-state environment power curve to realize steady-state environment calibration, wherein T is as follows std The temperature is set for the in-vehicle standard.
2. The intelligent calibration method for the automatic air conditioning system of the automobile according to claim 1, wherein the method comprises the following steps: in the step (1), the temperature in the vehicle is the temperature reported by the sensor in the vehicle or the temperature detected by the thermocouple at the head part in the vehicle.
3. The intelligent calibration method for the automatic air conditioning system of the automobile according to claim 1, wherein the method comprises the following steps: the measurement process of each parameter is performed in a state where the automobile is traveling at a constant speed or is stopped.
4. The intelligent calibration method for the automatic air conditioning system of the automobile according to claim 1, wherein the method comprises the following steps: by repeating steps (1) to (4) at different temperature levels, a plurality of UA values are obtained, and an average of the plurality of UA values is subjected to calculation of an ambient power curve.
5. The intelligent calibration method for the automotive automatic air conditioning system according to any one of claims 1 to 4, characterized by comprising the steps of: the optimal temperature T in the vehicle in the step (5) std ＝24℃。
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| CN202111409636.8A CN114013242B (en) | 2021-11-25 | 2021-11-25 | Intelligent calibration method for automatic air conditioning system of automobile |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106032926A (en) * | 2015-03-10 | 2016-10-19 | 惠州市德赛西威汽车电子股份有限公司 | A temperature control method and control device for an automobile air conditioner |
| CN111959233A (en) * | 2020-08-31 | 2020-11-20 | 芜湖云雀电子科技有限公司 | Cabin climate automatic control system of pure electric vehicle and control method thereof |
| CN112033703A (en) * | 2020-11-02 | 2020-12-04 | 中汽研汽车检验中心(宁波)有限公司 | Method for testing air conditioning comfort of passenger compartment of automobile |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6799102B2 (en) * | 2002-04-24 | 2004-09-28 | Delphi Technologies, Inc. | Automatic climate control with tunable transient response |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106032926A (en) * | 2015-03-10 | 2016-10-19 | 惠州市德赛西威汽车电子股份有限公司 | A temperature control method and control device for an automobile air conditioner |
| CN111959233A (en) * | 2020-08-31 | 2020-11-20 | 芜湖云雀电子科技有限公司 | Cabin climate automatic control system of pure electric vehicle and control method thereof |
| CN112033703A (en) * | 2020-11-02 | 2020-12-04 | 中汽研汽车检验中心(宁波)有限公司 | Method for testing air conditioning comfort of passenger compartment of automobile |
Non-Patent Citations (1)
| Title |
|---|
| 基于CAN总线的汽车自动空调控制系统设计;张晓伟;高新华;;电子设计工程;20200615(第12期);全文 * |
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