CN106671737B - Electric vehicle frequency converting air-conditioner compressor control method for frequency and control system based on hybrid control strategy - Google Patents
Electric vehicle frequency converting air-conditioner compressor control method for frequency and control system based on hybrid control strategy Download PDFInfo
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- CN106671737B CN106671737B CN201611184468.6A CN201611184468A CN106671737B CN 106671737 B CN106671737 B CN 106671737B CN 201611184468 A CN201611184468 A CN 201611184468A CN 106671737 B CN106671737 B CN 106671737B
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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
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
- B60H1/00392—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for electric vehicles having only electric drive means
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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
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3205—Control means therefor
- B60H1/3211—Control means therefor for increasing the efficiency of a vehicle refrigeration cycle
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- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a kind of electric vehicle frequency converting air-conditioner compressor control method for frequency and control system based on hybrid control strategy, the control method include: real-time acquisition vehicle interior temperature and air-conditioning system low pressure；Judge temperature changing trend；Within a control period, according to the deviation △ T and temperature changing trend between vehicle interior temperature and user's set temperature, compressor capacity service demand factor K is calculated, and then calculate compressor output frequency；In a compensation cycle, low-voltage compensation value is calculated using low-voltage compensation control method according to the deviation △ P between air-conditioning system low pressure and target low-pressure, compressor output frequency is changed according to low-voltage compensation value.Electric vehicle frequency converting air-conditioner compressor control method for frequency of the invention and system, comprehensively consider refrigeration capacity requirement and low pressure, belongs to the two mixing control, while guaranteeing refrigerating capacity output, maintenance refrigeration low pressure as much as possible, so that the operation that refrigeration system is reliable and stable.
Description
Technical field
The present invention relates to frequency converting air-conditioner compressor control technology, especially a kind of electric vehicle based on hybrid control strategy becomes
Frequency air conditioner compressor frequency control method.
Background technique
For air conditioning for automobiles for vehicle safety travel, passenger comfort is most important, with the rise of new-energy automobile,
Motor compressor gradually applies in air conditioning for automobiles, and the Energy Efficiency Ratio of refrigeration system can be improved in the introducing of converter technique, improves vapour
The precision of cruising ability and the cabin temperature control of vehicle battery.Reasonable compressor frequency control is for playing convertible frequency air-conditioner
Advantage plays decisive role, and the research for carrying out compressor frequency control method has great significance.
Summary of the invention
Goal of the invention: the object of the present invention is to provide a kind of electric vehicle frequency converting air-conditioner compressor based on hybrid control strategy
Control method for frequency and control system change compressor frequency output while as external load changes, consider simultaneously
The stability of refrigeration system pressure.
To achieve the goals above, present invention employs the following technical solutions:
A kind of electric vehicle frequency converting air-conditioner compressor control method for frequency based on hybrid control strategy, the control method packet
It includes:
Acquisition vehicle interior temperature and air-conditioning system low pressure in real time；
Judge temperature changing trend；
Within a control period, according between vehicle interior temperature and user's set temperature deviation △ T and temperature become
Change trend calculates compressor capacity service demand factor K, and then calculates compressor output frequency；
In a compensation cycle, according to the deviation △ P between air-conditioning system low pressure and target low-pressure, mended using low pressure
Control method is repaid, low-voltage compensation value is calculated, compressor output frequency is changed according to low-voltage compensation value.
The control method, further, the temperature changing trend include temperature first transition and temperature last transition.
The control method, further, the deviation △ T range between the vehicle interior temperature and set temperature are divided into:
In temperature first transition, T≤0 DEG C △, 0 T≤0.5 DEG C < △, 0.5 T≤1 DEG C < △, 1 DEG C of △ T >；
In temperature last transition, 0 DEG C of △ T >, -0.5 DEG C of T≤0 DEG C < △, -1 < △ T≤- 0.5 DEG C, △ T≤- 1 DEG C.
The control method, further, the compressor capacity service demand factor K out is according to vehicle interior temperature and set temperature
Between deviation △ T and temperature changing trend difference, be divided into following several grades: 0%；30%；60%；100%.
The control method, further, the compressor output frequency=compressor maximum frequency × ability need system
Number K.
The control method, further, the low-voltage compensation control method use PID control method.
The control method, further, further includes:
Acquisition evaporator temperature and air-conditioning system high pressure in real time, when evaporator temperature is in 0 DEG C or less whithin a period of time
Or air-conditioning system high pressure deviates safety value constantly, compressor is out of service.
A kind of electric vehicle frequency converting air-conditioner compressor frequency control system based on hybrid control strategy, the control system packet
It includes:
Vehicle interior temperature sensor, for acquiring vehicle interior temperature in real time；
Low pressure sensor, for acquiring air-conditioning system low pressure in real time；
Data processing unit, data processing unit connects vehicle interior temperature sensor and low pressure sensor, for judging temperature
Variation tendency, and according to the deviation △ T and temperature changing trend between vehicle interior temperature and set temperature, calculate compressor
Ability need COEFFICIENT K, and then calculate compressor output frequency；
Low-voltage compensation controller, low-voltage compensation controller connect data processing unit, for according to air-conditioning system low pressure and
Deviation △ P between target low-pressure calculates low-voltage compensation value using low-voltage compensation control method；
Variable frequency air-conditioner controller, variable frequency air-conditioner controller are separately connected data processing unit and frequency-changeable compressor, are used for root
Change compressor output frequency according to low-voltage compensation value.
The control system, further, further includes:
Evaporator temperature sensor, evaporator temperature sensor connect data processing unit, for acquiring evaporator in real time
Temperature；
High pressure sensor, high pressure sensor connect data processing unit, for acquiring air-conditioning system high pressure in real time.
The utility model has the advantages that electric vehicle frequency converting air-conditioner compressor control method for frequency of the invention and system, have comprehensively considered system
Refrigeration requirement and low pressure belong to the two mixing control, and while guaranteeing refrigerating capacity output, maintenance as much as possible is freezed
Low pressure, so that the operation that refrigeration system is reliable and stable.
Detailed description of the invention
Fig. 1 is the flow diagram of control method of the present invention；
Fig. 2 is the structural schematic diagram of control system of the present invention.
Specific embodiment:
Further explanation is done to the present invention with reference to the accompanying drawing.
As shown in Figure 1, a kind of electric vehicle frequency converting air-conditioner compressor frequency control based on hybrid control strategy of the invention
Method, the control method include:
First step: acquisition vehicle interior temperature and air-conditioning system low pressure in real time.Data collection cycle is set as 20S, each
Just, vehicle interior temperature sensor acquires vehicle interior temperature to a data collection cycle (20S), inputs to data processing unit, low pressure sensing
Device acquires air-conditioning system low voltage value, and low-voltage compensation controller is inputed to after being handled by data processing unit.
Second step: judge temperature changing trend.It sets and judges the period as 60s, data processing unit is by temperature sensor
The data of transmitting are recorded, and are averaged in each judgement period (60s), if the temperature averages in some period
T (n) than the last period temperature averages T (n-1) greatly, i.e. T (n) > T (n-1), then be judged as temperature first transition (rise
Edge)；If T (n)≤T (n-1) is judged as temperature last transition (failing edge), in order to avoid temperature fluctuation bring malfunctions,
Judge that the period should cannot be too small.
Third step: compressor output frequency is calculated.
First: set compressor output frequency control the period as 40S, each control period (40S) just, data processing
Unit calculates deviation △ T, △ T=vehicle interior temperature value-user's set temperature according to user's set temperature and vehicle interior temperature
Value, according to deviation △ T range and temperature changing trend judging result, determines ability need COEFFICIENT K according to the methods below:
Rising edge:
T≤0 DEG C △, K=0%；
0 T≤0.5 DEG C < △, K=30%；
0.5 T≤1 DEG C < △, K=60%；
1 DEG C of △ T >, K=100%；
Failing edge:
0 DEG C of △ T >, K=100%；
- 0.5 DEG C of T≤0 DEG C < △, K=60%；
- 1 < △ T≤- 0.5 DEG C, K=30%；
△ T≤- 1 DEG C, K=0%；
Then, according to ability need COEFFICIENT K, the compressor output frequency of each control period (40s) just is calculated: described
Compressor output frequency=compressor maximum frequency × ability need COEFFICIENT K, it is assumed that compressor maximum output 100Hz, corresponding system
Cooling capacity 4000W, minimum frequency 20Hz, corresponding refrigerating capacity 800W, compressor frequency change minimum 2Hz, then can be according to output frequency
Compressor output is divided into 41 gears (STEP) by rate, as shown in the table, for example, when compressor is with frequency 40Hz operation,
STEP=11, refrigerating capacity 1600W；
Four steps: compressor output frequency is changed using low-voltage compensation control method.
First: set the low-voltage compensation period as 120S, each low-voltage compensation period (120S) just, low-voltage compensation control
Device calculates low-voltage compensation using low-voltage compensation control method according to the deviation between air-conditioning system low pressure and target low-pressure
Value △ STEP, low-voltage compensation control method use PID control, calculate low-voltage compensation value △ STEP according to following formula:
The current air-conditioning system low voltage value-target low pressure value of present deviation value △ P=；
The deviation of the upper data collection cycle (20S) of change of error value △ △ P=present deviation value △ P- just；
As △ P >=0.3Bar or △ P≤- 0.3Bar；
△ STEP=is rounded (△ P × proportionality constant (P1)+△ △ P × derivative constant (D1))；
As -0.3Bar < △ P < 0.3Bar；
△ STEP=is rounded (△ △ P × derivative constant (D2)+∑ △ P × integral constant (I1))；
The every 20s of pressure sensor saves a low voltage value, and nearest deviation retains five, calculates ∑ △ P value；
Then: each low-voltage compensation period (120S) just, compensate △ on calculated compressor output frequency
STEP output, every 2min compensation are primary.Output STEP=STEP (n)+△ STEP (n), STEP (n) after n-th of Periodic Compensation
To be exported at this time according to the calculated compressor of aforementioned capabilities demand.
In addition, the normal safe operation in order to guarantee frequency converting air-conditioner compressor, in above-mentioned first step, also acquisition in real time
Evaporator temperature and air-conditioning system high pressure, data collection cycle are similarly 20S, each data collection cycle (20S) just, steam
It sends out device temperature sensor and acquires evaporator temperature values, input to data processing unit, high pressure sensor acquires air-conditioning system high pressure
Value, inputs to data processing unit, when evaporator temperature is in 0 DEG C or less or air-conditioning system high pressure deviation peace whithin a period of time
Constantly, compressor is out of service for total head.
A specific example is named to be illustrated:
Compressor uses above-mentioned compressor, and frequency ranges of operation 20Hz to 100Hz is divided into 41 STEP outputs.It is specific to hold
Scale is as noted above.The pid control parameter of low-voltage compensation is assumed to be P1=2, D1=4, D2=5, I1=1.4.Control target
It is 25 DEG C, low pressure 2.93Bar, corresponding 0 DEG C of evaporating temperature.
The compressor frequency output in 6min is calculated below, and the low pressure and vehicle interior temperature variation in 6min are as shown in the table.
Temperature changing trend in first minute is failing edge (data before 0s are not listed).
1) first frequency controls the period, when 0s according to can need (ability need COEFFICIENT K) calculated output STEP=41,
That is compressor 100Hz output, low-voltage compensation is according to formula: rounding (P × 4 △ P × 2+ △ △)=rounding (- 0.53*2+0*4)=
It is rounded the low-voltage compensation of (- 1.06)=- 1 △ STEP=-1, therefore is exported in 0s according to STEP=40, i.e., frequency is 98Hz；
2) second frequency controls the period, according to can the calculated output STEP=41 of need, i.e. compressor when 40s
100HZ output does not need low-voltage compensation since the low-voltage compensation period is 2min at this time, and STEP is 41 according to that can need to calculate output.
Due to last time period frequency 98Hz, at this time compressor should gradually raising frequency to 100Hz.
3) third frequency controls the period, according to can need calculated output STEP=21, i.e. compressor 60HZ when 80s
Output does not need low-voltage compensation since the low-voltage compensation period is 2min at this time, and STEP is 21 according to that can need to calculate output.At this time
Compressor should frequency reducing.
4) the 4th frequency controls the period, according to can need calculated output STEP=6, i.e. compressor 30HZ when 120s
Output needs low-voltage compensation, low-voltage compensation is according to formula since the low-voltage compensation period is 2min at this time: being rounded (△ △ P × 5+
P × 1.4 ∑ △)=being rounded (0.1*5+ (- 0.33-0.3-0.24-0.13-0.03) * 1.4)=rounding (- 0.942)=0
Low-voltage compensation △ STEP=0, therefore STEP is 6 in 120s.Compressor should frequency reducing at this time.
5) the 5th frequency controls the period, according to can need calculated output STEP=0, i.e. compressor 0HZ when 160s
Output does not need low-voltage compensation since the low-voltage compensation period is 2min at this time, and STEP is 0 according to that can need to calculate output.It presses at this time
Contracting machine should be downconverted to 0.
6) the 6th frequency controls the period, according to can need calculated output STEP=0, i.e. compressor 0HZ when 200s
Output does not need low-voltage compensation since the low-voltage compensation period is 2min at this time, and STEP is 0 according to that can need to calculate output.It presses at this time
Contracting unit frequency remains 0.
7) the 7th frequency controls the period, according to can need calculated output STEP=6, i.e. compressor 30HZ when 240s
Output needs low-voltage compensation, low-voltage compensation △ STEP=0, after STEP is according to compensation since the low-voltage compensation period is 2min at this time
Output is 6.At this time compressor should raising frequency to 30Hz.
8) the 8th frequency controls the period, according to can need calculated output STEP=6, i.e. compressor 30HZ when 280s
Output does not need low-voltage compensation since the low-voltage compensation period is 2min at this time, and STEP is 6 according to that can need to calculate output.It presses at this time
Contracting machine should be downconverted to 30Hz.
9) the 9th frequency controls the period, according to can the calculated output STEP=21 of need, i.e. compressor when 320s
60HZ output does not need low-voltage compensation since the low-voltage compensation period is 2min at this time, and STEP is 21 according to that can need to calculate output.
At this time compressor should raising frequency to 60Hz.
10) the tenth frequency controls the period, according to can the calculated output STEP=41 of need, i.e. compressor when 360s
100HZ output needs low-voltage compensation since the low-voltage compensation period is 2min at this time, low-voltage compensation △ STEP=-1, STEP according to
Output is 40 after compensation.At this time compressor should raising frequency to 98Hz.
As shown in Fig. 2, a kind of electric vehicle frequency converting air-conditioner compressor frequency control based on hybrid control strategy of the invention
System, the control system include:
Vehicle interior temperature sensor, for acquiring vehicle interior temperature in real time；
Low pressure sensor, for acquiring air-conditioning system low pressure in real time；
Data processing unit, data processing unit connects vehicle interior temperature sensor and low pressure sensor, for judging temperature
Variation tendency, and according to the deviation △ T and temperature changing trend between vehicle interior temperature and set temperature, calculate compressor
Ability need COEFFICIENT K, and then calculate compressor output frequency；
Low-voltage compensation controller, low-voltage compensation controller connect data processing unit, for according to air-conditioning system low pressure and
Deviation △ P between target low-pressure calculates low-voltage compensation value using low-voltage compensation control method；
Variable frequency air-conditioner controller, variable frequency air-conditioner controller connect data processing unit and frequency-changeable compressor, for according to low
Offset is pressed to change compressor output frequency；
Evaporator temperature sensor, evaporator temperature sensor connect data processing unit, for acquiring evaporator in real time
Temperature, when evaporator temperature is in 0 DEG C or less whithin a period of time, compressor is out of service；
High pressure sensor, high pressure sensor connect data processing unit, for acquiring air-conditioning system high pressure in real time, work as air-conditioning
When system high pressure deviates safety value, compressor is out of service.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (3)
1. a kind of electric vehicle frequency converting air-conditioner compressor control method for frequency based on hybrid control strategy, which is characterized in that described
Control method includes:
Acquisition vehicle interior temperature and air-conditioning system low pressure in real time；
Judge that temperature changing trend, the temperature changing trend include temperature first transition and temperature last transition, setting judgement
Period, data processing unit record the data that temperature sensor transmits, and average within each judgement period,
If some judges that the temperature averages in the period are bigger than the temperature averages in last judgement period, are judged as temperature rising area
Between, if some judges that the temperature averages in the period are less than or equal to the temperature averages in last judgement period, it is judged as temperature
Last transition；
Within a control period, according between vehicle interior temperature and user's set temperature deviation △ T and temperature change become
Gesture calculates compressor capacity service demand factor K, and then calculates compressor output frequency；
Deviation △ T range between the vehicle interior temperature and set temperature is divided into:
In temperature first transition, T≤0 DEG C △, 0 T≤0.5 DEG C < △, 0.5 T≤1 DEG C < △, 1 DEG C of △ T >；
In temperature last transition, 0 DEG C of △ T >, -0.5 DEG C of T≤0 DEG C < △, -1 < △ T≤- 0.5 DEG C, △ T≤- 1 DEG C；
The compressor capacity service demand factor K is according to the deviation △ T and temperature change between vehicle interior temperature and set temperature
The difference of trend is divided into following several grades: 0%；30%；60%；100%；
Ability need COEFFICIENT K is determined according to the methods below:
Temperature first transition:
T≤0 DEG C △, K=0%；
0 T≤0.5 DEG C < △, K=30%；
0.5 T≤1 DEG C < △, K=60%；
1 DEG C of △ T >, K=100%；
Temperature last transition:
0 DEG C of △ T >, K=100%；
- 0.5 DEG C of T≤0 DEG C < △, K=60%；
- 1 < △ T≤- 0.5 DEG C, K=30%；
△ T≤- 1 DEG C, K=0%；
The compressor output frequency=compressor maximum frequency × ability need COEFFICIENT K；
In a compensation cycle, according to the deviation △ P between air-conditioning system low pressure and target low-pressure, using low-voltage compensation control
Method processed calculates low-voltage compensation value, changes compressor output frequency according to low-voltage compensation value.
2. a kind of electric vehicle frequency converting air-conditioner compressor frequency controlling party based on hybrid control strategy according to claim 1
Method, it is characterised in that: the low-voltage compensation control method uses PID control method.
3. a kind of electric vehicle frequency converting air-conditioner compressor frequency controlling party based on hybrid control strategy according to claim 1
Method, which is characterized in that the control method further include:
Acquisition evaporator temperature and air-conditioning system high pressure in real time, when evaporator temperature is in 0 DEG C or less or empty whithin a period of time
When adjusting system high pressure deviates safety value, compressor is out of service.
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| CN107097607A (en) * | 2017-05-24 | 2017-08-29 | 苏州冷晨智能科技有限公司 | The Air Condition Compressor for Electric Vehicle system and its control method of temperature stabilization |
| CN107887672A (en) * | 2017-10-10 | 2018-04-06 | 中车工业研究院有限公司 | A kind of lithium ion battery temprature control method and device |
| CN108162713B (en) * | 2017-11-20 | 2020-11-24 | 珠海格力电器股份有限公司 | Control method, device and system of heat pump air conditioner |
| CN111483294B (en) * | 2019-01-25 | 2022-04-29 | 宇通客车股份有限公司 | Compressor frequency calculation method and device of automobile air conditioning system |
| CN111964319B (en) * | 2020-08-21 | 2021-12-03 | 中车青岛四方车辆研究所有限公司 | Compressor running frequency compensation method and system |
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