Air conditioning control system for new energy vehicle and new energy vehicle

Abstract

The present application relates to the technical field of new energy vehicles, and discloses an air conditioning control system of a new energy vehicle and a new energy vehicle, aiming to solve the problems of high cost and disadvantageous lightweight design of the existing air conditioning system of new energy vehicles, the new energy vehicle includes a power battery, a storage battery, an electric compressor and an electric heater, and the air conditioning control system includes: a power supply circuit, an MCU module, a CAN communication module, a half-bridge drive circuit and a single-tube drive circuit, the power battery is respectively connected to the power supply end of the electric compressor and the electric heater, the storage battery is respectively connected to the power supply end of the MCU module, the CAN communication module, the half-bridge drive circuit and the single-tube drive circuit through the power supply circuit, the MCU module is connected to the control end of the electric compressor through the half-bridge drive circuit, and the MCU module is connected to the control end of the electric heater through the single-tube drive circuit. The present application reduces the cost, is conducive to the lightweight design of new energy vehicles, and is particularly suitable for new energy vehicles that use electric heaters for heating.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicles, and in particular to an air-conditioning control system of a new energy vehicle and a new energy vehicle. Background Art

[0002] New energy vehicles mainly use electricity as a driving source, so the air conditioning system is different from that of traditional fuel vehicles. The air conditioning system of new energy vehicles mainly includes a refrigeration system and a heating system. The main components of the refrigeration system are electric compressors, and the main components of the heating system are electric heaters. When cooling, electric energy is used to drive the electric compressor, and the temperature inside the car is lowered through the circulation of refrigerant to achieve the purpose of cooling; when heating, electric energy is used to drive the electric heater, which generates heat by the current flowing through the PTC thermistor, thereby converting electric energy into thermal energy, and providing warm air to the car through the fan to achieve the purpose of heating.

[0003] In current new energy vehicles, the cooling system and heating system are purchased separately, and the two systems work independently, using their own controllers to communicate with the vehicle platform and control the corresponding actuators. Since both systems are high-voltage system controllers and fall into the category of thermal management of new energy vehicles, using separate controllers for each is not only costly, but also increases the weight of the vehicle, which is not conducive to the lightweight design of the entire vehicle. Utility Model Content

[0004] The present application aims to solve the problems of high cost and disadvantageous lightweight design of the existing air-conditioning system of new energy vehicles, and proposes an air-conditioning control system of a new energy vehicle and a new energy vehicle.

[0005] The technical solution adopted by this application to solve the above technical problems is:

[0006] In the first aspect, the present application provides an air-conditioning control system for a new energy vehicle, wherein the new energy vehicle includes a power battery, a storage battery, an electric compressor and an electric heater, and the air-conditioning control system includes: a power supply circuit, an MCU module, a CAN communication module, a half-bridge drive circuit and a single-tube drive circuit. The power battery is respectively connected to the power supply ends of the electric compressor and the electric heater, and the storage battery is respectively connected to the power supply ends of the MCU module, the CAN communication module, the half-bridge drive circuit and the single-tube drive circuit through the power supply circuit. The first signal output end of the MCU module is connected to the control end of the electric compressor through the half-bridge drive circuit, and the second signal output end of the MCU module is connected to the control end of the electric heater through the single-tube drive circuit.

[0007] Furthermore, the power supply circuit includes a first power supply circuit, a second power supply circuit and a linear regulator. The battery is connected to the CAN communication module through the first power supply circuit, and the battery is also connected to the power supply ends of the half-bridge drive circuit and the single-tube drive circuit respectively through the second power supply circuit. The output end of the second power supply circuit is connected to the power supply end of the MCU module through the linear regulator.

[0008] Furthermore, a digital isolator is included, and the battery is connected to the power supply terminal of the digital isolator through a first power supply circuit.

[0009] Further, the half-bridge drive circuit includes a half-bridge drive chip, a first IGBT, a second IGBT, a third IGBT, a fourth IGBT, a fifth IGBT and a sixth IGBT, the first IGBT and the second IGBT are arranged at the U-phase power supply end of the electric compressor, the third IGBT and the fourth IGBT are arranged at the V-phase power supply end of the electric compressor, the fifth IGBT and the sixth IGBT are arranged at the W-phase power supply end of the electric compressor, the U-phase drive end of the half-bridge drive chip is respectively connected to the drive end of the first IGBT and the drive end of the second IGBT, the V-phase drive end of the half-bridge drive chip is respectively connected to the drive end of the third IGBT and the drive end of the fourth IGBT, and the W-phase drive end of the half-bridge drive chip is respectively connected to the drive end of the fifth IGBT and the drive end of the sixth IGBT.

[0010] Furthermore, it also includes a first current detection circuit, the output end of the linear regulator is connected to the power supply end of the first current detection circuit, the current sampling end of the electric compressor is connected to the input end of the first current detection circuit, and the output end of the first current detection circuit is connected to the first signal input end of the MCU module.

[0011] Further, the electric heater includes a first PTC heating element, the single-tube drive circuit includes a first single-tube drive chip, a second single-tube drive chip, a seventh IGBT and an eighth IGBT, the seventh IGBT and the eighth IGBT are connected in series at the power supply end of the first PTC heating element, the first single-tube drive chip is connected to the drive end of the seventh IGBT, and the second single-tube drive chip is connected to the drive end of the eighth IGBT.

[0012] Furthermore, the electric heater also includes a second PTC heating element, and the single-tube drive circuit also includes a third single-tube drive chip and a ninth IGBT, the ninth IGBT is connected in series to the power supply end of the second PTC heating element, and the third single-tube drive chip is connected to the drive end of the ninth IGBT.

[0013] Furthermore, it also includes a second current detection circuit, the output end of the linear regulator is connected to the power supply end of the second current detection circuit, the current sampling end of the electric heater is connected to the input end of the second current detection circuit, and the output end of the second current detection circuit is connected to the second signal input end of the MCU module.

[0014] Furthermore, the MCU module is arranged on one side of the electric compressor.

[0015] In a second aspect, the present application provides a new energy vehicle, which includes the air-conditioning control system of the new energy vehicle as described in the first aspect.

[0016] The beneficial effects of the present application are as follows: the air conditioning control system and the new energy vehicle provided by the present application realize the control of the two systems of cooling and heating through an MCU module, reduce an independent controller, reduce the cost, and are conducive to the lightweight design of new energy vehicles. And by redesigning the drive circuits corresponding to the electric compressor and the electric heater, not only the reliable control of the corresponding actuators of the electric compressor and the electric heater by the MCU module is realized, but also the redundant protection of the electric heater is realized, and the reliability and safety of the control system are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of an air conditioning control system for a new energy vehicle provided in an embodiment of the present application;

[0018] Figure 2 A schematic diagram of a power supply circuit provided in an embodiment of the present application;

[0019] Figure 3 A schematic diagram of the structure of a half-bridge drive circuit provided in an embodiment of the present application;

[0020] Figure 4 A schematic diagram of the structure of a single-tube driving circuit provided in an embodiment of the present application;

[0021] Figure 5 A schematic diagram of the structure of another single-tube driving circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0023] The technical solution of the embodiment of the present application is applicable to the application scenario of new energy vehicles that are heated by electric heaters.

[0024] In current new energy vehicles, the cooling system and heating system are purchased separately, and the two systems work independently, using their own controllers to communicate with the vehicle platform and control the corresponding actuators. Using separate controllers for the two systems is not only costly, but also increases the weight of the vehicle, which is not conducive to the lightweight design of the entire vehicle.

[0025] Based on this, the technical solution of the present application is proposed. In an embodiment of the present application, a new energy vehicle includes a power battery, a storage battery, an electric compressor and an electric heater, and the air-conditioning control system includes: a power supply circuit, an MCU module, a CAN communication module, a half-bridge drive circuit and a single-tube drive circuit. The power battery is respectively connected to the power supply ends of the electric compressor and the electric heater, and the storage battery is respectively connected to the power supply ends of the MCU module, the CAN communication module, the half-bridge drive circuit and the single-tube drive circuit through the power supply circuit. The first signal output end of the MCU module is connected to the control end of the electric compressor through the half-bridge drive circuit, and the second signal output end of the MCU module is connected to the control end of the electric heater through the single-tube drive circuit.

[0026] It is understandable that since the refrigeration system and heating system of new energy vehicles are both high-voltage system controllers and belong to the thermal management category of new energy vehicles, they also need to interact with the communication of the whole vehicle. The main difference is that the actuators controlled by the two are different, which provides the feasibility of combining the two controllers into one. The embodiment of the present application realizes the control of both the refrigeration and heating systems through an MCU module, reduces an independent controller, reduces costs, and is conducive to the lightweight design of new energy vehicles.

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0028] See also Figure 1 In the embodiment of the present application, the new energy vehicle includes a power battery, a storage battery, an electric compressor and an electric heater. Among them, the storage battery is mainly used for the low-voltage system of the vehicle, such as power supply for lights, windows, audio equipment and the like, and the battery voltage is generally 12V. The power battery is the main source of energy to drive the vehicle, and the voltage of the power battery is generally higher. The electric compressor is the main component of the vehicle's refrigeration system, and the electric heater is the main component of the vehicle's heating system. The energy of the electric compressor and the electric heater is provided by the power battery.

[0029] See also Figure 1In an embodiment of the present application, the air-conditioning control system includes: a power supply circuit, an MCU module, a CAN communication module, a half-bridge drive circuit and a single-tube drive circuit. The power battery is respectively connected to the power supply ends of the electric compressor and the electric heater, and the storage battery is respectively connected to the power supply ends of the MCU module, the CAN communication module, the half-bridge drive circuit and the single-tube drive circuit through the power supply circuit. The first signal output end of the MCU module is connected to the control end of the electric compressor through the half-bridge drive circuit, and the second signal output end of the MCU module is connected to the control end of the electric heater through the single-tube drive circuit.

[0030] In the above-mentioned system of the embodiment of the present application, the power battery supplies power to the electric compressor and the electric heater, and provides energy for the operation of the electric compressor and the electric heater. The output voltage of the battery supplies power to the MCU module, the half-bridge drive circuit and the single-tube drive circuit through the power supply circuit. After the MCU module is powered on, it interacts with the vehicle platform through the CAN communication module, and controls the electric compressor accordingly through the half-bridge drive circuit, and controls the electric heater accordingly through the single-tube drive circuit, that is, the control of the two systems of cooling and heating is realized through one MCU module, thereby reducing an independent controller, reducing costs, and facilitating the lightweight design of new energy vehicles.

[0031] See also Figure 2 In an embodiment of the present application, the power supply circuit includes a first power supply circuit, a second power supply circuit and a linear regulator. The battery is connected to the CAN communication module through the first power supply circuit. The battery is also connected to the power supply ends of the half-bridge drive circuit and the single-tube drive circuit respectively through the second power supply circuit. The output end of the second power supply circuit is connected to the power supply end of the MCU module through a linear regulator.

[0032] The embodiment of the present application also includes a digital isolator, and the battery is connected to the power supply end of the digital isolator through the first power supply circuit. The digital isolator is used to electrically isolate the low-voltage side and the high-voltage side, thereby improving the reliability and stability of the system power supply.

[0033] In practical applications, the output voltage of the battery is usually 12V. The 12V output voltage of the battery is converted into 5V through the first power supply circuit to power the digital isolator and the CAN communication module respectively. The CAN communication module is used to realize the network communication between the MCU module and the whole vehicle, for example, receiving the corresponding air-conditioning control signal, feeding back relevant status information, etc. The 12V output of the battery is converted into 15V through the second power supply circuit to power the half-bridge drive circuit and the single-tube drive circuit respectively, and the output 12V is converted into 3.3V through the linear regulator to power the MCU module.

[0034] See also Figure 3In an embodiment of the present application, the half-bridge drive circuit includes a half-bridge drive chip, a first IGBT, a second IGBT, a third IGBT, a fourth IGBT, a fifth IGBT and a sixth IGBT, the first IGBT and the second IGBT are arranged at the U-phase power supply end of the electric compressor, the third IGBT and the fourth IGBT are arranged at the V-phase power supply end of the electric compressor, the fifth IGBT and the sixth IGBT are arranged at the W-phase power supply end of the electric compressor, the U-phase drive end of the half-bridge drive chip is respectively connected to the drive end of the first IGBT and the drive end of the second IGBT, the V-phase drive end of the half-bridge drive chip is respectively connected to the drive end of the third IGBT and the drive end of the fourth IGBT, and the W-phase drive end of the half-bridge drive chip is respectively connected to the drive end of the fifth IGBT and the drive end of the sixth IGBT.

[0035] It can be understood that in the embodiment of the present application, 6 IGBTs (Insulate-Gate Bipolar Transistor) constitute a PMSM bridge circuit. When the circuit is working, the signal output end of the MCU module sends a corresponding control signal to the half-bridge driver chip. The half-bridge driver chip drives the two IGBTs connected in series in each of the three phases U, V, and W according to the control signal, thereby realizing corresponding control of the electric compressor and thus corresponding control of the refrigeration system.

[0036] In the embodiment of the present application, the MCU module is arranged on one side of the electric compressor. During the operation of the electric compressor, the MCU module will be actively cooled to avoid overheating of the MCU module. When the electric heater works alone, the electric compressor does not run, so in actual application, the heat can be dissipated passively, that is, when the electric heater works alone, the switching frequency of the PWM square wave controller of the PTC upper bridge is set to a low frequency of 2Hz, reducing the turn-on and turn-off losses of the IGBT and avoiding overheating damage to the MCU module.

[0037] See also Figure 3 In an embodiment of the present application, a first current detection circuit is also included, the output end of the linear regulator is connected to the power supply end of the first current detection circuit, the current sampling end of the electric compressor is connected to the input end of the first current detection circuit, and the output end of the first current detection circuit is connected to the first signal input end of the MCU module.

[0038] In actual application, the first current detection circuit is also powered by 3.3V converted by the linear regulator. Current sampling is performed through the first current detection circuit, that is, the UVW three-phase current output of the electric compressor is detected. The MCU module can perform closed-loop control of the corresponding IGBT according to the sampled current, thereby improving the accuracy of the electric compressor control.

[0039] See also Figure 4 In one embodiment of the present application, the electric heater includes a first PTC heating element, the single-tube driving circuit includes a first single-tube driving chip, a second single-tube driving chip, a seventh IGBT and an eighth IGBT, the seventh IGBT and the eighth IGBT are connected in series at the power supply end of the first PTC heating element, the first single-tube driving chip is connected to the driving end of the seventh IGBT, and the second single-tube driving chip is connected to the driving end of the eighth IGBT.

[0040] Specifically, the embodiment of the present application adopts a single-tube driver chip to drive the corresponding IGBT. When the electric heater of the new energy vehicle has only the first PTC heating element, it is only necessary to weld the seventh IGBT of the upper bridge and the eighth IGBT of the lower bridge to realize the heating control of the first PTC heating element, wherein the IGBT welded on the upper bridge is controlled by a PWM square wave controller. Specifically, the MCU module sends a corresponding control signal to the corresponding single-tube driver chip, and the corresponding single-tube driver chip controls the corresponding IGBT to turn on or off, thereby realizing the heating control of the first PTC heating element. When the first PTC heating element is operating normally, the seventh IGBT of the upper bridge and the eighth IGBT of the lower bridge are in the on state. When the seventh IGBT of the upper bridge is short-circuited and broken down, the eighth IGBT of the lower bridge is automatically controlled to be in the off state, thereby realizing the protection function, preventing the PTC heating element from continuing to work in the event of an abnormality, and thereby improving the safety of the control system.

[0041] See also Figure 5 In another embodiment of the present application, the electric heater also includes a second PTC heating element, the single-tube drive circuit also includes a third single-tube drive chip and a ninth IGBT, the ninth IGBT is connected in series to the power supply end of the second PTC heating element, and the third single-tube drive chip is connected to the drive end of the ninth IGBT.

[0042] Specifically, when the electric heater of a new energy vehicle has two PTC heating elements, that is, when the electric heater includes both the first PTC heating element and the second PTC heating element, the heating control of the two-way PTC heating element actuator can be realized by adding the ninth IGBT on the upper bridge. When the first PTC heating element and the second PTC heating element are both operating normally, the seventh IGBT, the eighth IGBT and the ninth IGBT are in the on state. When the seventh IGBT or the ninth IGBT of the upper bridge has a short circuit breakdown, the eighth IGBT of the lower bridge is automatically controlled to be in the off state, thereby realizing the protection function, preventing the PTC heating element from continuing to work in the event of an abnormality, and thus improving the safety of the control system.

[0043] See also Figure 4 and Figure 5In an embodiment of the present application, a second current detection circuit is also included, the output end of the linear regulator is connected to the power supply end of the second current detection circuit, the current sampling end of the electric heater is connected to the input end of the second current detection circuit, and the output end of the second current detection circuit is connected to the second signal input end of the MCU module.

[0044] In actual application, the second current detection circuit is also powered by 3.3V converted by the linear regulator. Current sampling is performed through the second current detection circuit, that is, the current output of the electric heater is detected. The MCU module can perform closed-loop control of the corresponding IGBT according to the sampled current, thereby improving the accuracy of the electric heater control.

[0045] In summary, the air conditioning control system of the new energy vehicle provided by the embodiment of the present application realizes the control of the two systems of cooling and heating through one MCU module, reduces an independent controller, reduces the cost, and is conducive to the lightweight design of new energy vehicles. And by redesigning the drive circuits corresponding to the electric compressor and the electric heater, not only the reliable control of the corresponding actuators of the electric compressor and the electric heater by the MCU module is realized, but also the redundant protection of the electric heater is realized, and the reliability and safety of the control system are improved.

[0046] Based on the above technical solution, this embodiment also proposes a new energy vehicle, which includes the air-conditioning control system of the new energy vehicle described in the embodiment of the present application.

[0047] It can be understood that since the new energy vehicle described in the embodiment of the present application includes the air-conditioning control system of the new energy vehicle described in the embodiment, for the new energy vehicle disclosed in the embodiment, since it corresponds to the air-conditioning control system disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the system.

[0048] It should be noted that the present application only provides an air-conditioning control system for a new energy vehicle and a specific structure of a new energy vehicle, wherein the related modules involved are all hardware system modules or functional modules that combine computer software programs or protocols with hardware in the prior art. The computer software programs or protocols involved in the functional modules are themselves technologies that are well known to those skilled in the art, and they are not improvements to the present system and will not be elaborated on here. The improvement to the present system is the interaction or connection relationship between the modules, that is, to improve the overall structure of the system in order to solve the corresponding technical problems to be solved by the present system.

Claims

1. An air conditioning control system for a new energy vehicle, the new energy vehicle comprising a power battery, a storage battery, an electric compressor and an electric heater, characterized in that: The air-conditioning control system includes: a power supply circuit, an MCU module, a CAN communication module, a half-bridge drive circuit and a single-tube drive circuit. The power battery is respectively connected to the power supply ends of the electric compressor and the electric heater. The storage battery is respectively connected to the power supply ends of the MCU module, the CAN communication module, the half-bridge drive circuit and the single-tube drive circuit through the power supply circuit. The first signal output end of the MCU module is connected to the control end of the electric compressor through the half-bridge drive circuit, and the second signal output end of the MCU module is connected to the control end of the electric heater through the single-tube drive circuit.

2. The air conditioning control system of a new energy vehicle according to claim 1, characterized in that: The power supply circuit includes a first power supply circuit, a second power supply circuit and a linear regulator. The battery is connected to the CAN communication module through the first power supply circuit. The battery is also connected to the power supply ends of the half-bridge drive circuit and the single-tube drive circuit respectively through the second power supply circuit. The output end of the second power supply circuit is connected to the power supply end of the MCU module through the linear regulator.

3. The air conditioning control system of the new energy vehicle according to claim 2, characterized in that: It also includes a digital isolator, and the battery is connected to the power supply terminal of the digital isolator through a first power supply circuit.

4. The air conditioning control system for new energy vehicles according to claim 2, characterized in that: The half-bridge drive circuit includes a half-bridge drive chip, a first IGBT, a second IGBT, a third IGBT, a fourth IGBT, a fifth IGBT and a sixth IGBT, the first IGBT and the second IGBT are arranged at the U-phase power supply end of the electric compressor, the third IGBT and the fourth IGBT are arranged at the V-phase power supply end of the electric compressor, the fifth IGBT and the sixth IGBT are arranged at the W-phase power supply end of the electric compressor, the U-phase drive end of the half-bridge drive chip is respectively connected to the drive end of the first IGBT and the drive end of the second IGBT, the V-phase drive end of the half-bridge drive chip is respectively connected to the drive end of the third IGBT and the drive end of the fourth IGBT, and the W-phase drive end of the half-bridge drive chip is respectively connected to the drive end of the fifth IGBT and the drive end of the sixth IGBT.

5. The air conditioning control system of the new energy vehicle according to claim 4, characterized in that: It also includes a first current detection circuit, the output end of the linear regulator is connected to the power supply end of the first current detection circuit, the current sampling end of the electric compressor is connected to the input end of the first current detection circuit, and the output end of the first current detection circuit is connected to the first signal input end of the MCU module.

6. The air conditioning control system of the new energy vehicle according to claim 2, characterized in that: The electric heater includes a first PTC heating element, and the single-tube drive circuit includes a first single-tube drive chip, a second single-tube drive chip, a seventh IGBT and an eighth IGBT. The seventh IGBT and the eighth IGBT are connected in series at the power supply end of the first PTC heating element, the first single-tube drive chip is connected to the drive end of the seventh IGBT, and the second single-tube drive chip is connected to the drive end of the eighth IGBT.

7. The air conditioning control system for new energy vehicles according to claim 6, characterized in that: The electric heater also includes a second PTC heating element, and the single-tube drive circuit also includes a third single-tube drive chip and a ninth IGBT, the ninth IGBT is connected in series to the power supply end of the second PTC heating element, and the third single-tube drive chip is connected to the drive end of the ninth IGBT.

8. The air conditioning control system of a new energy vehicle according to claim 6 or 7, characterized in that: It also includes a second current detection circuit, the output end of the linear regulator is connected to the power supply end of the second current detection circuit, the current sampling end of the electric heater is connected to the input end of the second current detection circuit, and the output end of the second current detection circuit is connected to the second signal input end of the MCU module.

9. The air conditioning control system for a new energy vehicle according to claim 1, characterized in that: The MCU module is arranged on one side of the electric compressor.

10. A new energy vehicle, characterized in that: The new energy vehicle comprises an air conditioning control system for a new energy vehicle as described in any one of claims 1 to 9.

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