An electric vehicle air conditioning warm air system and a control method thereof

Abstract

The application discloses an electric vehicle air conditioner warm air system, a warm air machine water circuit comprising a first hydraulic drive component, a first heating component, a water flow control valve, a first three-way joint, a warm air machine, a second three-way joint and a first electric heating water valve connected with a first water tank in sequence, the first electric heating water valve is connected back to the first water tank, a heat source cooling and water circuit comprising a heat dissipation component, a second hydraulic drive component, a heat source, a third three-way joint, a second electric heating water valve, a first three-way joint, a warm air machine, a second three-way joint, a fourth electric heating water valve and a fourth three-way joint connected with a second water tank in sequence, the fourth three-way joint is connected back to the heat dissipation component, and the third three-way joint is further connected to the fourth three-way joint through a third electric heating water valve, and a control device is used for controlling the electric heating water valve to make the heat source cooling and water circuit circulate to provide heat for the warm air machine when a preset condition is met, the heat energy in the vehicle can be recycled and utilized to provide warm air for the air conditioner, and the cruising range in cold weather is prolonged. The application further discloses a control method of the electric vehicle air conditioner warm air system.

Description

Technical Field

[0001] This invention belongs to the field of electric vehicle equipment technology, and in particular relates to an air conditioning and heating system for electric vehicles and its control method. Background Technology

[0002] As the electrification of engineering vehicles continues to accelerate, the range of engineering vehicles in cold regions is becoming increasingly prominent. The air conditioning and heating systems of existing electric engineering vehicles all use PTC electric heating antifreeze. The antifreeze transfers heat to the cab to heat the interior environment. It is clear that this directly converts electrical energy into heat energy, resulting in extremely high power consumption. This will significantly shorten the range of electric engineering vehicles in winter. Therefore, how to reduce the power consumption for heating has become an urgent problem to be solved. Summary of the Invention

[0003] To address the aforementioned issues, this invention provides an air conditioning and heating system for electric vehicles and its control method, which can recover and utilize the heat energy generated by the motor and / or controller in the vehicle to provide warm air for the air conditioning system, thereby achieving energy conservation and emission reduction and extending the driving range in cold weather.

[0004] This invention provides an air conditioning and heating system for electric vehicles, comprising a heater water circuit and a heat source cooling water circuit. The heater water circuit includes a first hydraulic drive component, a first heating component, a water flow control valve, a first three-way valve, a heater, a second three-way valve, and a first electric hot water valve, all connected sequentially to a first water tank. The first electric hot water valve is connected back to the first water tank. The heat source cooling water circuit includes a heat dissipation component, a second hydraulic drive component, a heat source, a third three-way valve, a second electric hot water valve, the first three-way valve, the heater, the second three-way valve, a fourth electric hot water valve, and a third three-way valve, all connected sequentially to a second water tank. The fourth three-way valve is connected back to the heat dissipation component, and the third three-way valve is also connected to the fourth three-way valve through the third electric hot water valve. The first electric hot water valve, the second electric hot water valve, the third electric hot water valve, and the fourth electric hot water valve are all connected to the control device. The control device is used to control the first electric hot water valve and the third electric hot water valve to close and control the second electric hot water valve and the fourth electric hot water valve to open when preset conditions are met, so that the heat source is cooled and circulated into the water circuit to provide heat for the heater. The heat source is a motor and / or a controller.

[0005] Preferably, in the above-mentioned air conditioning and heating system for electric vehicles, the first hydraulically driven component is a water pump.

[0006] Preferably, in the above-mentioned air conditioning and heating system for electric vehicles, the first heating component is a PTC heating box.

[0007] Preferably, in the above-mentioned air conditioning and heating system for electric vehicles, the water flow control valve is a one-way valve.

[0008] Preferably, in the above-mentioned electric vehicle air conditioning and heating system, the second hydraulic drive component is a second water pump.

[0009] Preferably, in the above-mentioned air conditioning and heating system for electric vehicles, the heat dissipation component includes a radiator connected to a cooling motor.

[0010] This invention provides a control method for an electric vehicle air conditioning and heating system, utilizing the electric vehicle air conditioning and heating system as described in any of the above claims, comprising:

[0011] Step 1: Check if the heater switch is closed. If it is closed, proceed to Step 2; otherwise, end the process.

[0012] Step 2: Collect the customer-set temperature value T0, the heat source coolant temperature value T1, the cab temperature T2, and the rotational speed n of the second hydraulic drive component;

[0013] Step 3: Determine whether T2 is greater than T0. If the result is yes, the process ends; otherwise, proceed to step 4.

[0014] Step 4: Determine if n is greater than 0. If the result is no, enter the electric heating warm air mode. If the result is yes, proceed to step 5.

[0015] Step 5: Determine whether T1 is greater than T0. If the result is no, enter the electric heating warm air mode. If the result is yes, control the first electric hot water valve and the third electric hot water valve to close, and control the second electric hot water valve and the fourth electric hot water valve to open, so that the heat source is cooled and enters the water circuit for circulation, to provide heat for the warm air heater.

[0016] Preferably, the control method for the above-mentioned air conditioning and heating system of an electric vehicle further includes:

[0017] Steps 2 through 5 are repeated at preset intervals.

[0018] Preferably, in the above-mentioned control method for the air conditioning and heating system of an electric vehicle, the preset time is 20 to 40 seconds.

[0019] As described above, the electric vehicle air conditioning and heating system provided by this invention includes a heater water circuit and a heat source cooling water circuit. The heater water circuit includes a first hydraulic drive component, a first heating component, a water flow control valve, a first three-way valve, a heater, a second three-way valve, and a first electric hot water valve, all connected sequentially to a first water tank. The first electric hot water valve is connected back to the first water tank. The heat source cooling water circuit includes a heat dissipation component, a second hydraulic drive component, a heat source, a third three-way valve, a second electric hot water valve, the first three-way valve, the heater, the second three-way valve, a fourth electric hot water valve, and a fourth three-way valve, all connected sequentially to a second water tank. The fourth three-way valve is connected back to the heat dissipation component. The third three-way valve is also connected to the fourth three-way valve via a third electric hot water valve. The first, second, third, and fourth electric hot water valves are all connected to a control device. The control device is used to close the first and third electric hot water valves and open the second and fourth electric hot water valves when preset conditions are met, allowing the heat source to cool and circulate in the water circuit to heat the heater. The heat source is a motor and / or controller, thus enabling the recovery and utilization of heat generated by the motor and / or controller in the vehicle to provide warm air for the air conditioner, achieving energy saving and extending the driving range in cold weather. The control method for the electric vehicle air conditioning and heating system provided by this invention has the same advantages. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of an embodiment of an air conditioning and heating system for an electric vehicle provided by the present invention;

[0022] Figure 2 This is a schematic diagram of an embodiment of a control method for an air conditioning and heating system of an electric vehicle provided by the present invention. Detailed Implementation

[0023] The core of this invention is to provide an air conditioning and heating system for electric vehicles and its control method, which can recover and utilize the heat energy generated by the motor and / or controller in the vehicle to provide warm air for the air conditioning, thereby achieving energy saving and consumption reduction, and extending the driving range in cold weather. It is especially suitable for various electric engineering vehicles.

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] An embodiment of the air conditioning and heating system for electric vehicles provided by the present invention is as follows: Figure 1 As shown, Figure 1 This is a schematic diagram of an embodiment of an air conditioning and heating system for an electric vehicle provided by the present invention. This embodiment of the air conditioning and heating system for an electric vehicle may include a heater water circuit (the part enclosed by the dashed box) and a heat source cooling water circuit (the part enclosed by the solid box). The heater water circuit includes a first hydraulic drive component 2, a first heating component 3, a water flow control valve 4, a first three-way valve 5, a heater 6, a second three-way valve 7, and a first electric hot water valve 8, which are connected sequentially to a first water tank 1. The first electric hot water valve 8 is connected back to the first water tank 1. This heater water circuit is a water circuit that already exists in the prior art. The heat source cooling water circuit includes a heat dissipation component 10, a second hydraulic drive component 11, a heat source 12, a third three-way valve 13, a second electric hot water valve 14, a first three-way valve 5, a heater 6, a second three-way valve 7, and a fourth electric hot water valve 15, which are connected sequentially to a second water tank 9. The fourth three-way valve 16 is connected back to the heat dissipation component 10, and the third three-way valve 13 is also connected to the fourth three-way valve 16 through the third electric hot water valve 17. The first electric hot water valve 8, the second electric hot water valve 14, the third electric hot water valve 17 and the fourth electric hot water valve 16 are all connected to the control device. The control device is used to control the first electric hot water valve 8 and the third electric hot water valve 17 to close and control the second electric hot water valve 14 and the fourth electric hot water valve 16 to open when the preset conditions are met, so that the heat source is cooled and circulated into the water circuit to provide heat for the heater. The heat source 12 is the motor 121 and / or the controller 122. That is to say, the heat of the motor 121 can be collected alone, the heat of the controller 122 can be collected alone, or the heat of the motor 121 and the controller 122 can be collected simultaneously. These can be selected according to actual needs.

[0026] It should be noted that the first heating element 3 mentioned above can be, but is not limited to, a PTC heating element. The water flow in a traditional warm air cooling circuit is as follows: Coolant flows from the first water tank 1 through the first hydraulic drive component 2 to the first heating element 3. After heating, it passes through the water flow control valve 4 and the first three-way valve 5 to reach the heater 6. After dissipation, it returns to the first water tank 1 through the second three-way valve 7 and the first electric hot water valve 8, completing one cycle. During this process, the second electric hot water valve 14 and the fourth electric hot water valve 16 are in the closed state. The water flow when the heat source is cooled and integrated into the water circuit is as follows: Coolant enters the heat dissipation component 10 from the second water tank 9 and flows through the second hydraulic drive component 11 to the heat source 12 for heating. After heating, it passes through the third three-way valve 13 and the second electric hot water valve 14 through the first three-way valve 5 to reach the heater 6. After dissipation, it returns to the heat dissipation component 10 through the second three-way valve 7, the fourth electric hot water valve 15, and the fourth three-way valve 16, completing the cycle. During this process, the first electric hot water valve 8 and the third electric hot water valve 17 are in the closed state. This demonstrates that the heat generated by the motor and / or controller can be recovered and utilized, saving energy and increasing the driving range of electric vehicles, which is especially practical in cold winters.

[0027] As described above, in the embodiment of the electric vehicle air conditioning and heating system provided by the present invention, since it includes a heater water circuit and a heat source cooling water circuit, the heater water circuit includes a first hydraulic drive component 2, a first heating component 3, a water flow control valve 4, a first three-way valve 5, a heater 6, a second three-way valve 7, and a first electric hot water valve 8 connected sequentially to the first water tank 1. The first electric hot water valve 8 is connected back to the first water tank 1. The heat source cooling water circuit includes a heat dissipation component 10, a second hydraulic drive component 11, a heat source 12, a third three-way valve 13, a second electric hot water valve 14, a first three-way valve 5, a heater 6, a second three-way valve 7, a fourth electric hot water valve 15, and a fourth three-way valve 16 connected sequentially to the second water tank 9. The fourth three-way valve 16... The heat dissipation component 10 is connected back, and the third three-way valve 13 is also connected to the fourth three-way valve 16 through the third electric hot water valve 17. The first electric hot water valve 8, the second electric hot water valve 14, the third electric hot water valve 17 and the fourth electric hot water valve 16 are all connected to the control device. The control device is used to control the first electric hot water valve 8 and the third electric hot water valve 17 to close and control the second electric hot water valve 14 and the fourth electric hot water valve 16 to open when the preset conditions are met, so that the heat source is cooled and circulated into the water circuit to provide heat for the heater. The heat source 12 is the motor 121 and / or the controller 122. Therefore, the heat energy generated by the motor and / or controller in the vehicle can be recovered and utilized to provide warm air for the air conditioner, realize energy saving and consumption reduction, and extend the driving range in cold weather.

[0028] In one specific embodiment of the aforementioned air conditioning and heating system for electric vehicles, the first hydraulic drive component 2 can preferably be a water pump, and the second hydraulic drive component 11 can also preferably be a second water pump. This reduces costs and provides sufficient power to the water. Of course, other types of drive components can also be selected according to actual needs, and there are no limitations here. Additionally, the aforementioned first heating component 3 can preferably be a PTC heating box. This type of heating box is widely used and readily available. Of course, other types of heating components can also be selected according to actual needs, and there are no limitations here.

[0029] In another specific embodiment of the above-mentioned air conditioning and heating system for electric vehicles, the water flow control valve 4 can preferably be a one-way valve, so that the internal water circuit is opened when energized, and at the same time, it prevents the water circuit from backflowing due to different impedances, thus causing energy loss and resulting in better control effect. Of course, other types of water flow control valves can also be selected according to actual needs, which is not limited here.

[0030] In yet another specific embodiment of the aforementioned electric vehicle air conditioning and heating system, refer to... Figure 1 The heat dissipation component 10 may include a radiator 102 connected to the heat dissipation motor 101, so that the heat dissipation motor can drive the radiator to dissipate heat from the water and prevent overheating. Of course, other components can be selected according to actual needs, and there are no restrictions here.

[0031] An example of an implementation of the control method for an air conditioning and heating system of an electric vehicle provided by the present invention. Figure 2 As shown, Figure 2 This is a schematic diagram of an embodiment of a control method for an electric vehicle air conditioning and heating system provided by the present invention. The electric vehicle air conditioning and heating system, as described in any of the above claims, includes:

[0032] Step S1: Determine if the heater switch is closed. If it is closed, proceed to Step 2; otherwise, end the process.

[0033] Specifically, the determination can be made by the air conditioning heating controller, but is not limited to this.

[0034] Step S2: Collect the customer-set temperature value T0, the heat source coolant temperature value T1, the cab temperature T2, and the rotational speed n of the second hydraulic drive component;

[0035] Step 3 S3: Determine whether T2 is greater than T0. If the result is yes, end; otherwise, proceed to step 4.

[0036] Step 4 S4: Determine if n is greater than 0. If the result is no, enter the electric heating warm air mode. If the result is yes, proceed to step 5.

[0037] Step 5 S5: Determine if T1 is greater than T0. If the result is no, enter the electric heating warm air mode. If the result is yes, control the first and third electric hot water valves to close, and control the second and fourth electric hot water valves to open, so that the heat source is cooled and circulated into the water circuit to provide heat for the warm air heater.

[0038] In a specific embodiment of the control method for the air conditioning and heating system of the above-mentioned electric vehicle, steps two through five may be repeated at preset time intervals. This allows for continuous evaluation of the current situation; when the corresponding conditions are met, the waste heat generated by the motor and controller is used to heat the vehicle interior, saving electricity and achieving resource recycling, thus increasing the vehicle's driving range. Furthermore, the preset time interval is preferably 20 to 40 seconds, and even more preferably 30 seconds. This minimizes switching frequency while ensuring sufficient energy saving. Of course, other time intervals can be selected according to actual needs; there are no limitations here.

[0039] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control method for an air conditioning and heating system of an electric vehicle, characterized in that, The electric vehicle air conditioning and heating system includes a heater water circuit and a heat source cooling water circuit. The heater water circuit includes a first hydraulic drive component (2), a first heating component (3), a water flow control valve (4), a first three-way valve (5), a heater (6), a second three-way valve (7), and a first electric hot water valve (8), which are connected in sequence to the first water tank (1). The first electric hot water valve (8) is connected back to the first water tank (1). The heat source cooling water circuit includes a heat dissipation component (10), a second hydraulic drive component (11), a heat source (12), a third three-way valve (13), a second electric hot water valve (14), the first three-way valve (5), the heater (6), the second three-way valve (7), a fourth electric hot water valve (15), and a fourth The third three-way valve (16) is connected back to the heat dissipation component (10), and the third three-way valve (13) is also connected to the fourth three-way valve (16) through the third electric hot water valve (17). The first electric hot water valve (8), the second electric hot water valve (14), the third electric hot water valve (17), and the fourth electric hot water valve (15) are all connected to the control device. The control device is used to control the first electric hot water valve (8) and the third electric hot water valve (17) to close when the preset conditions are met, and to control the second electric hot water valve (14) and the fourth electric hot water valve (15) to open, so that the heat source is cooled and circulated into the water circuit to provide heat for the heater. The heat source (12) is a motor (121) and / or a controller (122). The control method includes: Step 1: Check if the heater switch is closed. If it is closed, proceed to Step 2; otherwise, end the process. Step 2: Collect the customer-set temperature value T0, the heat source coolant temperature value T1, the cab temperature T2, and the rotational speed n of the second hydraulic drive component; Step 3: Determine whether T2 is greater than T0. If the result is yes, the process ends; otherwise, proceed to step 4. Step 4: Determine if the rotation speed n is greater than 0. If the result is no, enter the electric heating warm air mode. If the result is yes, proceed to step 5. Step 5: Determine whether T1 is greater than T0. If the result is no, enter the electric heating warm air mode. If the result is yes, control the first electric hot water valve and the third electric hot water valve to close, and control the second electric hot water valve and the fourth electric hot water valve to open, so that the heat source is cooled and enters the water circuit for circulation, to provide heat for the warm air heater.

2. The control method for the air conditioning and heating system of an electric vehicle according to claim 1, characterized in that, The first hydraulic drive component (2) is a water pump.

3. The control method for the air conditioning and heating system of an electric vehicle according to claim 1, characterized in that, The first heating component (3) is a PTC heating box.

4. The control method for the air conditioning and heating system of an electric vehicle according to claim 1, characterized in that, The water flow control valve (4) is a one-way valve.

5. The control method for the air conditioning and heating system of an electric vehicle according to claim 1, characterized in that, The second hydraulic drive component (11) is a second water pump.

6. The control method for the air conditioning and heating system of an electric vehicle according to claim 1, characterized in that, The heat dissipation component (10) includes a heat sink (102) connected to the heat dissipation motor (101).

7. The control method for the air conditioning and heating system of an electric vehicle according to claim 1, characterized in that, Also includes: Steps 2 through 5 are repeated at preset intervals.

8. The control method for the air conditioning and heating system of an electric vehicle according to claim 7, characterized in that, The preset time is 20 to 40 seconds.

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