CN110789295B - A PTC multiple over-temperature protection system for electric vehicles - Google Patents
A PTC multiple over-temperature protection system for electric vehicles Download PDFInfo
- Publication number
- CN110789295B CN110789295B CN201911192147.4A CN201911192147A CN110789295B CN 110789295 B CN110789295 B CN 110789295B CN 201911192147 A CN201911192147 A CN 201911192147A CN 110789295 B CN110789295 B CN 110789295B
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- China
- Prior art keywords
- ptc
- switch
- control signal
- electrically connected
- relay
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Links
- 238000010438 heat treatment Methods 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000010257 thawing 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
- B60H1/00357—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
-
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
-
- 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
- B60H1/00507—Details, e.g. mounting arrangements, desaeration devices
- B60H2001/00614—Cooling of electronic units in air stream
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention provides a PTC multiple over-temperature protection system of an electric automobile, which comprises a PTC heating core body and a whole automobile controller, wherein the whole automobile controller comprises an AC control signal input end, a PTC control signal input end, an AC control signal output end and a PTC control signal output end, a low-voltage power supply is electrically connected with the PTC control signal input end through a blower switch and a PTC request switch, the PTC control signal output end is electrically connected with a first high-voltage relay, a low-voltage power supply is electrically connected with the AC control signal input end through the blower switch and a compressor control switch, the AC control signal output end is electrically connected with a second high-voltage relay, the high-voltage power supply supplies power to the PTC heating core body through the first high-voltage relay, and the high-voltage power supply supplies power to an electric compressor through the second high-voltage relay.
Description
Technical Field
The invention relates to the technical field of electric vehicles, in particular to a PTC multiple over-temperature protection system of an electric vehicle.
Background
At present, electric PTC core bodies are used for heating the warm air systems of the electric automobiles. The PTC core body is heated and is divided into water heating PTC and air heating PTC according to different heat transfer media. The PTC heating system is small in change of a warm air system on the basis of a traditional fuel vehicle, and can meet the use requirement of the system by directly replacing a fuel vehicle water heating core body with the PTC core body, so that the PTC heating system is widely used in the field of electric vehicles at present. However, the PTC is at risk of overheating relative to the water heating core, and the temperature of the PTC core may exceed the tolerance limit of the HVAC housing, resulting in damage to the HVAC housing and even a risk of fire in the vehicle, so that the air heating PTC employs a temperature control switch for overheat protection. The temperature control switch is damaged to cause the condition of protection failure, so that the vehicle has a certain safety risk.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the PTC multiple over-temperature protection system for the electric automobile, which reduces the overheat risk of the PTC core body and ensures the use safety of the automobile.
The invention provides a PTC multiple over-temperature protection system of an electric automobile, which is characterized by comprising a PTC heating core body and a whole automobile controller, wherein the whole automobile controller comprises an AC control signal input end, a PTC control signal input end, an AC control signal output end and a PTC control signal output end, a low-voltage power supply is electrically connected with the PTC control signal input end through a blower switch and a PTC request switch, the PTC control signal output end is electrically connected with a first high-voltage relay, the low-voltage power supply is electrically connected with the AC control signal input end through the blower switch and a compressor control switch, the AC control signal output end is electrically connected with a second high-voltage relay, the high-voltage power supply supplies power to the PTC heating core body through the first high-voltage relay, the high-voltage power supply supplies power to the electric compressor through the second high-voltage relay, when the AC control signal input end receives an input signal, the AC control signal output end outputs no electrical signal, and when the PTC control signal input end receives the input signal, the PTC control signal output end outputs no electrical signal, and the AC control signal output end does not output the electrical signal.
A first PTC temperature controller is connected in series between the blower switch and the PTC request switch.
A second PTC temperature controller is connected in series between the blower switch and the PTC request switch, and the first PTC temperature controller is connected in series with the second PTC temperature controller.
In the above technical scheme, the motor control device further comprises a resistor end of a third relay which is electrically connected with the actuation feedback end of the second high-voltage relay, one end of a switch end of the third relay is electrically connected with the rotating speed start-stop signal input end of the electric compressor, and the other section of the switch end of the third relay is electrically connected with the power supply through a temperature control module, a compressor control switch and a blower switch.
In the above technical scheme, a fourth relay is connected in series between the compressor control switch and the AC control signal input terminal.
In the technical scheme, a pressure switch is connected in series between one end of the switch end of the third relay and the rotating speed start-stop signal input end of the electric compressor.
In the above technical scheme, the AC control output terminal is electrically connected with the resistor terminal of the second high-voltage relay, and the high-voltage power supply is electrically connected with the high-voltage input terminal of the electric compressor through the switch terminal of the second high-voltage relay.
In the technical scheme, the low-voltage power supply supplies power to the blower through the blower switch, a plurality of resistors are connected in series between the blower and the blower switch, the blower switch comprises a plurality of gear ends, and one ends of the plurality of resistors are respectively and electrically connected with the corresponding gear ends.
In the technical scheme, the temperature control module is provided with a resistance sensor and is used for controlling the temperature of the air conditioner evaporator not to drop to the freezing point.
In the technical scheme, the PTC heating core body comprises PTC heating sheets and radiating sheets, and the first PTC temperature controller are arranged on the PTC heating core body.
According to the invention, through the PTC request switch, the two PTC temperature controllers and the blower switch which are connected in series at the signal input end in the whole vehicle controller, the 3-fold protection of PTC over-temperature is realized. The invention adds a temperature controller as a control source for PTC operation to avoid the risk of PTC overheat caused by damage of a single temperature controller, and simultaneously adds a blower switch as a control source for PTC operation, the PTC can be opened after the blower is forcibly started by the system, thereby avoiding PTC dry heating, and even if the temperature controllers are damaged, the PTC can not overheat even if the air flow is cooled. In addition, the whole vehicle controller receives the PTC opening request signal and the refrigeration opening request signal simultaneously, and the PTC control output state is judged by integrating the two signal states, so that the PTC dry burning is prevented, and the PTC control output state is used as the 4 th protection against PTC over-temperature. In the refrigerating mode, because the air door in the cold and warm mode closes the air flow to the PTC core body, the VCU increases whether the refrigerating is started or not as a PTC starting judging condition, and when the refrigerating is started, the PTC request switch is wrongly started, the PTC does not work, and PTC dry burning is prevented.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention
Detailed Description
The invention will now be described in further detail with reference to the drawings and specific examples, which are given for clarity of understanding and are not to be construed as limiting the invention.
The invention provides a PTC multiple over-temperature protection system of an electric automobile, which is characterized by comprising a PTC heating core body and a whole automobile controller, wherein the whole automobile controller comprises an AC control signal input end, a PTC control signal input end, an AC control signal output end and a PTC control signal output end, a low-voltage power supply is electrically connected with the PTC control signal input end through a blower switch and a PTC request switch, the PTC control signal output end is electrically connected with a first high-voltage relay, the low-voltage power supply is electrically connected with the AC control signal input end through the blower switch and a compressor control switch, the AC control signal output end is electrically connected with a second high-voltage relay, the high-voltage power supply supplies power to the PTC heating core body through the first high-voltage relay, the AC control signal output end outputs an electric signal when the AC control signal input end receives an input signal, the PTC control signal output end does not output the electric signal when the AC control signal input end receives the input signal, the PTC control signal output end outputs the electric signal, and the AC control signal output end does not output the electric signal when the AC control signal input end does not receive the input signal.
A first PTC temperature controller is connected in series between the blower switch and the PTC request switch. A second PTC temperature controller is connected in series between the blower switch and the PTC request switch, and the first PTC temperature controller and the second PTC temperature controller are connected in series, so that PTC overheat risks caused by damage of a single temperature controller are avoided.
In the above technical scheme, the motor control device further comprises a resistor end of a third relay which is electrically connected with the actuation feedback end of the second high-voltage relay, one end of a switch end of the third relay is electrically connected with the rotating speed start-stop signal input end of the electric compressor, and the other section of the switch end of the third relay is electrically connected with the power supply through a temperature control module, a compressor control switch and a blower switch. A fourth relay is connected in series between the compressor control switch and the AC control signal input end. A pressure switch is connected in series between one end of the switch end of the third relay and the rotating speed start-stop signal input end of the electric compressor. The AC control output end is electrically connected with the resistance end of the second high-voltage relay, and the high-voltage power supply is electrically connected with the high-voltage input end of the electric compressor through the switch end of the second high-voltage relay.
The working flow of the invention is as follows:
After the whole vehicle is electrified at high voltage, if heating and defrosting requirements exist, a PTC request switch is started;
Starting a blower switch, and outputting current from a power source to a PTC control input end through the blower switch, two temperature controllers and a PTC request switch;
If the compressor control switch is in an off state and no signal is input from the AC control input end, the PTC control output end outputs (high-efficiency) voltage, the first high-voltage relay is conducted in a sucking way, the PTC works normally, and otherwise the PTC heating core does not work;
in the PTC working process, the first PTC temperature controller 1 and the second PTC temperature controller 2 are conducted when the detected temperature is lower than the set temperature, the PTC heating core works normally, otherwise, the PTC heating core stops working;
in the PTC working process, one of the two PTC temperature controllers is damaged and is in a conducting state, the other PTC temperature controller is conducted when the detected temperature is lower than the set temperature, the PTC heating core works normally, and otherwise, the PTC heating core stops working.
If the compressor control switch is in a closed state at this time, the output current of the low-voltage power supply is transmitted to the AC control input end through the blower switch and the compressor control switch, and the whole vehicle controller receives an AC control input low-effective signal, the PTC control output end does not output voltage, the first high-voltage relay is in an open state, and the PTC heating core body does not work. The AC control output end outputs an electric signal, and the second high-voltage relay is conducted, so that the high-voltage power supply supplies power to the electric compressor, and the strong ground of the electric compressor is grounded. The actuation feedback end of the second high-voltage relay outputs an electric signal to the third relay, and the third relay is conducted, so that the temperature control module is electrically connected with the input of the rotating speed start-stop signal of the electric compressor. The low-voltage power supply is electrically connected with the electric compressor through the blower switch, the compressor control switch, the temperature control module, the pressure switch and the electric compressor, and the weak ground of the electric compressor is grounded.
In the technical scheme, the low-voltage power supply supplies power to the blower through the blower switch, a plurality of resistors are connected in series between the blower and the blower, the blower switch comprises a plurality of gear ends, and one ends of the plurality of resistors are respectively and electrically connected with the corresponding gear ends. The blower switch is switched to different gears to realize the switching of the wind speed.
In the technical scheme, the temperature control module is provided with a resistance sensor and is used for controlling the temperature of the air conditioner evaporator not to drop to the freezing point. When the temperature control module monitors that the real-time temperature in the vehicle is higher than the set value, the electric signal is automatically conducted, namely the electric signal is output to the rotating speed start-stop signal input end of the electric compressor, so that the electric compressor rotates. The pressure switch is used to prevent the refrigerant system piping from being too high or too low, which would control the compressor to shut down.
According to the technical scheme, the PTC heating core body comprises the PTC heating sheets and the radiating sheets, and the first PTC temperature controller are arranged on the PTC heating core body to realize real-time monitoring of the PTC heating core body.
What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911192147.4A CN110789295B (en) | 2019-11-28 | 2019-11-28 | A PTC multiple over-temperature protection system for electric vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911192147.4A CN110789295B (en) | 2019-11-28 | 2019-11-28 | A PTC multiple over-temperature protection system for electric vehicles |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110789295A CN110789295A (en) | 2020-02-14 |
| CN110789295B true CN110789295B (en) | 2025-03-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911192147.4A Active CN110789295B (en) | 2019-11-28 | 2019-11-28 | A PTC multiple over-temperature protection system for electric vehicles |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110789295B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7687770B2 (en) * | 2022-02-09 | 2025-06-03 | 株式会社ヴァレオジャパン | Heating control device and control program, fluid heating unit, heating cycle device, and vehicle air conditioner equipped with the same |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203416831U (en) * | 2013-09-16 | 2014-02-05 | 管昊中 | Electrical heating kneecap capable of storing energy in advance |
| CN104260616A (en) * | 2014-10-24 | 2015-01-07 | 北京长安汽车工程技术研究有限责任公司 | Electric automobile heating system and method |
| CN107804131A (en) * | 2016-09-09 | 2018-03-16 | 东风银轮（十堰）汽车热交换器有限公司 | A kind of control circuit for electric automobile air conditioner |
| CN208993458U (en) * | 2018-09-05 | 2019-06-18 | 湖北省齐星汽车车身股份有限公司 | A kind of PTC protection system of automotive dynamoelectric machine formula warm wind control system |
| CN110271384A (en) * | 2019-06-11 | 2019-09-24 | 东风汽车股份有限公司 | pure electric vehicle air conditioner control system and method |
| CN211808918U (en) * | 2019-11-28 | 2020-10-30 | 东风商用车有限公司 | Multiple excess temperature protection system of electric automobile PTC |
-
2019
- 2019-11-28 CN CN201911192147.4A patent/CN110789295B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203416831U (en) * | 2013-09-16 | 2014-02-05 | 管昊中 | Electrical heating kneecap capable of storing energy in advance |
| CN104260616A (en) * | 2014-10-24 | 2015-01-07 | 北京长安汽车工程技术研究有限责任公司 | Electric automobile heating system and method |
| CN107804131A (en) * | 2016-09-09 | 2018-03-16 | 东风银轮（十堰）汽车热交换器有限公司 | A kind of control circuit for electric automobile air conditioner |
| CN208993458U (en) * | 2018-09-05 | 2019-06-18 | 湖北省齐星汽车车身股份有限公司 | A kind of PTC protection system of automotive dynamoelectric machine formula warm wind control system |
| CN110271384A (en) * | 2019-06-11 | 2019-09-24 | 东风汽车股份有限公司 | pure electric vehicle air conditioner control system and method |
| CN211808918U (en) * | 2019-11-28 | 2020-10-30 | 东风商用车有限公司 | Multiple excess temperature protection system of electric automobile PTC |
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| Publication number | Publication date |
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| CN110789295A (en) | 2020-02-14 |
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