CN110962537B - Air conditioner PTC heater starting control method, medium and air conditioner - Google Patents
Air conditioner PTC heater starting control method, medium and air conditioner Download PDFInfo
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- CN110962537B CN110962537B CN201911128912.6A CN201911128912A CN110962537B CN 110962537 B CN110962537 B CN 110962537B CN 201911128912 A CN201911128912 A CN 201911128912A CN 110962537 B CN110962537 B CN 110962537B
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- ptc heater
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004590 computer program Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 102100036894 Protein patched homolog 2 Human genes 0.000 description 2
- 101710161395 Protein patched homolog 2 Proteins 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 102100028680 Protein patched homolog 1 Human genes 0.000 description 1
- 101710161390 Protein patched homolog 1 Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00371—Air-conditioning arrangements specially adapted for particular vehicles for vehicles carrying large numbers of passengers, e.g. buses
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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
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
- B60H1/2218—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters controlling the operation of electric heaters
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air Conditioning Control Device (AREA)
- Motor And Converter Starters (AREA)
Abstract
The invention provides a method for controlling the starting of a PTC heater of a new energy bus air conditioner, a computer readable storage medium and the air conditioner. According to the invention, the first buffer time is set to control the two PTC heaters to be separately started, so that the superposition of two starting impact heavy currents is avoided, and the electrical service life of the new energy bus air conditioner is prolonged.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a starting control method of a PTC heater of an air conditioner, a computer readable storage medium and the air conditioner.
Background
The new energy bus air conditioner generally adopts a compressor and a PTC heater to heat. The compressor is operated to provide heating quantity, and when the heat quantity provided by the compressor is insufficient, the PTC heater is started to assist in heating.
Due to the characteristics of the PTC, when the PTC heater is electrified and started, the current rises to the highest point, then the current drops, and then the process is gradually stable. We call the highest point reached by the current overshoot the maximum starting current.
The maximum starting current will be large, and some will reach 2.5 times the rated current. For example, the PTC heater of the new energy bus air conditioner has the rated power of 5KW and the rated voltage of 750VDC, the rated current is 6.67A, and the maximum current during starting can reach 16.7A.
The high starting current causes a great impact on electrical components at the front end, such as a fuse, a dc contactor, a power supply, and the like. A new energy bus air conditioner is provided with a left PTC heater and a right PTC heater, if the rated current of each electric heating is 6.67A, the current of the two electric heaters is 13.34A when the bus air conditioner operates stably, but the maximum current can reach 33.4A when the bus air conditioner is started, great electric shock is caused to electric elements at the front end, and the electric service life of the electric elements is shortened.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a starting control method of the PTC heater of the air conditioner, which can reduce the impact current when the PTC heater of the new energy bus air conditioner is started and prolong the electric service life of the new energy bus air conditioner.
In order to achieve the purpose, the invention adopts the following technical scheme:
a starting control method for PTC heaters of an air conditioner is characterized in that when the heating capacity of a system is insufficient, an auxiliary PTC heater needs to be started, the current of a main circuit is detected, a first auxiliary PTC heater is started after the current of the main circuit meets the starting condition, the current of the main circuit is continuously detected after a period of time, and a second auxiliary PTC heater is started after the current of the main circuit meets the starting condition. Through setting up first buffering time, control two PTC heaters and separately open, avoided two to start to strike heavy current stack, improved the electric life-span of new forms of energy bus air conditioner.
Further, the starting of the first auxiliary PTC heater after the main circuit current satisfies the start condition specifically includes: detecting main circuit current to obtain current value I1If I is1 ≤Ilimit1Then, turning on the first auxiliary PTC heater, whereinlimit1Is a preset current value; if I1＞Ilimit1Reducing the frequency of the compressor or stopping the compressor without starting the auxiliary PTC heater; after the frequency of the compressor is reduced or the compressor is stopped, the current of the main circuit is detected to obtain the current value I2If I is2 ≤Ilimit1The first auxiliary PTC heater is turned on. Detecting the current of the whole machine, when the PTC heater is ready to be started, firstly reducing the frequency of the compressor or stopping the compressor, and reducing the current of the whole machine to a limit value Ilimit1Then, the electric heating is started, and the damage of the PTC heater caused by overlarge impact current is avoided.
Further, the starting of the second auxiliary PTC heater after the main circuit current satisfies the start condition specifically includes: detecting main circuit current to obtain current value I3If I is3 ≤Ilimit2Then, turning on a second auxiliary PTC heater, wherein Ilimit2Is a preset current value; if I3 ＞Ilimit2Detecting the current of the main circuit to obtain a current value I after a period of time without starting the second auxiliary PTC heater4If I is4 ≤Ilimit2The second auxiliary PTC heater is turned on. Detecting the current of the whole machine, and reducing the current to a limit value I after the PTC heater is startedlimit2At the moment, the second auxiliary PTC heater is started, so that the phenomenon that two PTC heaters are simultaneously started and impact current is superposed is avoided, and the air conditioner is ensuredThe system operates stably and reliably.
Further, after the second auxiliary PTC heater is started, the current of the main circuit is detected to obtain a current value I5If I is5≤Ilimit3Raising the compressor frequency or starting the compressor, wherein Ilimit3Is a preset current value.
Further, after the second auxiliary PTC heater is started, the current of the main circuit is detected to obtain a current value I5If I is5＞Ilimit3Maintaining the original running state, waiting for a period of time, detecting the current of the main circuit to obtain a current value I6If I is6 ≤Ilimit3Raising the compressor frequency or starting the compressor.
A computer readable storage medium storing a computer program which, when invoked by a processor, implements the air conditioner PTC heater start control method of any preceding claim.
An air conditioner comprising a processor and a memory for storing a computer program which, when invoked by the processor, implements the air conditioner PTC heater start control method of any preceding claim.
The starting control method of the air conditioner PTC heater, the computer readable storage medium and the air conditioner provided by the invention have the beneficial effects that: the problem of large impact current when the PTC heater of the new energy bus air conditioner is started is solved, the impact current when the PTC heater of the new energy bus air conditioner is started is reduced, and the electrical service life of the new energy bus air conditioner is prolonged; meanwhile, the allowable current requirement of the electric element option can be reduced, and the cost is reduced.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step are within the scope of the present invention.
Example 1: a starting control method for a PTC heater of an air conditioner.
As shown in fig. 1, a method for controlling the start of a PTC heater of an air conditioner includes the following steps:
(1) the main control unit is ready to start the auxiliary PTC heater, and first detects the main circuit current I to obtain the main circuit current value I1；I1And a set current value Ilimit1By comparison, if I1≤Ilimit1Then, the first auxiliary PTC heater 1 is turned on;
(2) if I1＞Ilimit1The frequency of the compressor is reduced or the compressor is stopped (the fan is not stopped), thereby reducing the main circuit current I. After the frequency reduction or the shutdown of the compressor is finished, the current I of the main circuit is detected to obtain the current value I of the main circuit2。I2And a set current value Ilimit1By comparison, if I2≤Ilimit1Then, the first auxiliary PTC heater 1 is turned on;
(3) starting timing when PTC1 is started, detecting main circuit current I after time T1, and obtaining main circuit current value I3。I3And a set current value Ilimit2By comparison, if I3≤Ilimit2Then, the first auxiliary PTC heater 2 is turned on;
(4) if I3＞Ilimit2Re-timing, and waiting for T1, detecting the main circuit current I again to obtain the main circuit current value I4。I4And a set current value Ilimit2By comparison, if I4≤Ilimit2Then, the first auxiliary PTC heater 2 is turned on;
(5) starting PTC2 to restart timing, detecting main circuit current I after time T1 to obtain main circuit current value I5(ii) a If I5≤Ilimit3The compressor is increased in frequency or started to provide more heat;
(6) if I5＞Ilimit3Re-timing, and waiting for T1, detecting the main circuit current I again to obtain the main circuit current value I6。I6And a set current value Ilimit3By comparison, if I6≤Ilimit3The compressor is increased in frequency or started to provide more heat;
wherein, Ilimit1=3A；Ilimit2=13A； Ilimit3=20A； T1=30s。
Before the PTC is ready to be started, the compressor is firstly used for reducing the frequency to reduce the current of the whole machine to 3A, the first PTC is started, the current of the whole machine is increased to 19A for about 30 s-1 min, and the current of the whole machine falls back and is stabilized to 11A (other loads 3A and PTC current 8A) which is smaller than Ilimit2And starting the second PTC, flushing the current of the whole machine to 27A for about 30 s-1 min, and enabling the current of the whole machine to fall back and stabilize to 19A (wherein other loads are 3A, and the current of the two PTC is 16A).
Example 2: a starting control method for a PTC heater of an air conditioner.
A starting control method for an air conditioner PTC heater comprises the following specific steps:
the difference from embodiment 1 is that the main circuit current value is not detected, and the auxiliary PTC heaters 1 and the PTC2 are turned on at regular intervals. Generally, the power-on impact current of the PTC can fall back stably within 30s, and the power-on current superposition of the two PTC can be avoided as long as the two PTC are forcibly started at the interval of more than 30 s. That is, the other load current 10A + the two PTC power-on currents 32A =42A, the interval is opened, the current rush up to 26A when the first PTC is opened and then falls back to be stable to 18A, and the current rush up to 34A when the second PTC is opened and then falls back to 26A, which can play a role in avoiding large rush current.
Example 3: a computer readable storage medium.
A computer-readable storage medium storing a computer program that implements the air conditioner PTC heater start-up control method of embodiment 1 or embodiment 2 when the computer program is called by a processor.
Example 4: an air conditioner.
An air conditioner comprising a processor and a memory for storing a computer program that, when invoked by the processor, implements the air conditioner PTC heater start control method of embodiment 1 or embodiment 2.
The above description is only for the preferred embodiment of the present invention, but the present invention should not be limited to the embodiment and the disclosure of the drawings, and therefore, all equivalent or modifications that do not depart from the spirit of the present invention are intended to fall within the scope of the present invention.
Claims (8)
1. A starting control method for a PTC heater of an air conditioner is characterized in that when the heating capacity of a system is insufficient and an auxiliary PTC heater needs to be started, the current of a main circuit is detected, when the current of the main circuit meets the starting condition, a first auxiliary PTC heater is started, the current of the main circuit is continuously detected after a period of time, and when the current of the main circuit meets the starting condition, a second auxiliary PTC heater is started; when the main circuit current meets the starting condition, starting the first auxiliary PTC heater specifically comprises the following steps: detecting main circuit current to obtain current value I1If I is1≤Ilimit1Then, turning on the first auxiliary PTC heater, whereinlimit1Is a preset current value; if I1＞Ilimit1The frequency of the compressor is reduced or the compressor is stopped without turning on the auxiliary PTC heater.
2. A PTC heater start control method of air conditioner according to claim 1, characterized in that after said compressor frequency is decreased or the compressor is stopped, the main circuit current is detected to obtain the current value I2If I is2≤Ilimit1The first auxiliary PTC heater is turned on.
3. A method for controlling the start of a PTC heater of an air conditioner according to claim 1, wherein the starting of the second auxiliary PTC heater when the main circuit current satisfies the start condition is specifically: detecting main circuit current to obtain current value I3If I is3≤Ilimit2Then, turning on a second auxiliary PTC heater, wherein Ilimit2Is a preset current value.
4. Control method for starting PTC heater of air conditioner according to claim 3Process, characterized in that if I3＞Ilimit2Detecting the current of the main circuit to obtain a current value I after a period of time without starting the second auxiliary PTC heater4If I is4≤Ilimit2The second auxiliary PTC heater is turned on.
5. A PTC heater start control method for an air conditioner according to claim 3 or 4, characterized in that after the second auxiliary PTC heater is turned on, the current value I obtained by detecting the main circuit current is obtained5If I is5≤Ilimit3Raising the compressor frequency or starting the compressor, wherein Ilimit3Is a preset current value.
6. A PTC heater start control method for an air conditioner according to claim 3 or 4, characterized in that after the second auxiliary PTC heater is turned on, the current value I obtained by detecting the main circuit current is obtained5If I is5＞Ilimit3Maintaining the original running state, waiting for a period of time, detecting the current of the main circuit to obtain a current value I6If I is6≤Ilimit3Raising the compressor frequency or starting the compressor.
7. A computer-readable storage medium for storing a computer program, wherein the computer program, when invoked by a processor, implements the air conditioner PTC heater startup control method of any one of claims 1-6.
8. An air conditioner comprising a processor and a memory for storing a computer program, wherein the computer program when invoked by the processor implements the air conditioner PTC heater startup control method of any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911128912.6A CN110962537B (en) | 2019-11-18 | 2019-11-18 | Air conditioner PTC heater starting control method, medium and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911128912.6A CN110962537B (en) | 2019-11-18 | 2019-11-18 | Air conditioner PTC heater starting control method, medium and air conditioner |
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| Publication Number | Publication Date |
|---|---|
| CN110962537A CN110962537A (en) | 2020-04-07 |
| CN110962537B true CN110962537B (en) | 2021-10-22 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006327341A (en) * | 2005-05-24 | 2006-12-07 | Denso Corp | Electric heater and vehicular air-conditioner |
| CN103493583A (en) * | 2011-08-04 | 2014-01-01 | 三菱重工汽车空调系统株式会社 | Heater control device, control method, and control program |
| CN107303794A (en) * | 2016-04-22 | 2017-10-31 | 比亚迪股份有限公司 | A kind of PTC liquid heater and its method for heating and controlling |
| CN109963732A (en) * | 2016-09-02 | 2019-07-02 | 博格思众公司 | System and method for starting vehicle air conditioner |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6713729B2 (en) * | 2001-03-12 | 2004-03-30 | Denso Corporation | Electric load control system and vehicle air-conditioning system having the same |
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- 2019-11-18 CN CN201911128912.6A patent/CN110962537B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006327341A (en) * | 2005-05-24 | 2006-12-07 | Denso Corp | Electric heater and vehicular air-conditioner |
| CN103493583A (en) * | 2011-08-04 | 2014-01-01 | 三菱重工汽车空调系统株式会社 | Heater control device, control method, and control program |
| CN107303794A (en) * | 2016-04-22 | 2017-10-31 | 比亚迪股份有限公司 | A kind of PTC liquid heater and its method for heating and controlling |
| CN109963732A (en) * | 2016-09-02 | 2019-07-02 | 博格思众公司 | System and method for starting vehicle air conditioner |
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