Whole vehicle air PTC heating control device

Abstract

The utility model discloses a whole vehicle air PTC heating control device relates to the field of new energy vehicles. The whole vehicle air PTC heating control device, including temperature setting module, PTC heater, air outlet temperature sensor and control unit, the PTC heater is connected with PTC relay, and the power supply of PTC heater is controlled by PTC relay's on-off, and control unit is electrically connected with temperature setting module, air outlet temperature sensor and PTC relay respectively. The whole vehicle air PTC heating control device, through the real -time feedback of control unit based on air outlet temperature sensor, carries out closed -loop regulation to PTC relay, can significantly reduce the invalid opening frequency of PTC heater, compared with the existing fixed power mode, and the winter heating energy consumption can drop 1.4kw, under the environment temperature of -7 DEG C, and the whole vehicle WLTP endurance mileage can improve 14km, effectively alleviates the new energy vehicle low temperature endurance anxiety.

Description

Technical Field

[0001] This utility model relates to the field of new energy vehicles, and in particular to a vehicle air PTC heating control device. Background Technology

[0002] In the field of new energy vehicles, when the ambient temperature is low in winter (such as -7°C and below), passenger cabin heating mainly relies on air PTC heaters. This device heats the air inside the air conditioning unit by being electrically powered, and then the hot air is delivered into the passenger cabin by a blower. However, the existing air PTC heating systems for new energy vehicles have significant drawbacks, as follows: Excessive energy consumption and range reduction issues: Existing systems generally adopt a "fixed power heating" mode, lacking a dynamic adjustment mechanism. Once the PTC heater is started, it operates at a constant power, and continues to consume energy even if the air temperature meets the needs of passengers. This results in high energy consumption for heating in winter, which seriously reduces the range of new energy vehicles (especially in low-temperature environments, where the range reduction problem is more prominent).

[0003] Poor heating comfort: Due to the lack of a target temperature range constraint, the constant power output of the PTC heater will cause the air conditioner outlet temperature to remain high (without a clear upper limit control), making passengers feel "hot and dry"; and there is no temperature subdivision corresponding to the gear, which cannot meet the different heating temperature needs of different passengers, resulting in a poor comfort experience. Utility Model Content

[0004] The purpose of this invention is to provide a vehicle air PTC heating control device to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a vehicle air PTC heating control device, comprising: The temperature setting module allows users to set the heating level. The PTC heater is installed inside the air conditioning unit and is used to heat the air. An outlet air temperature sensor is installed on the outlet side of the PTC heater to monitor the outlet air temperature in real time. The PTC heater is connected to a PTC relay, which controls the power supply to the PTC heater. The control unit is electrically connected to the temperature setting module, the outlet air temperature sensor, and the PTC relay, respectively. The control unit is configured to: determine the target temperature range based on the heating setting, and control the switching state of the PTC relay according to the feedback data from the outlet air temperature sensor, so as to achieve closed-loop regulation of the outlet air temperature.

[0006] Preferably, the temperature setting module includes multiple settings, each corresponding to a preset target temperature range, wherein the settings include: Level 1: Target temperature range is 30℃~35℃; Level 2: Target temperature range is 35℃~40℃; Level 3: Target temperature range is 40℃~50℃; Level 4: Target temperature range is 50℃~60℃.

[0007] Preferably, the control unit is specifically configured as follows: When the outlet air temperature reaches the upper limit of the target temperature range, the PTC relay is disconnected to stop heating; When the outlet air temperature drops to the lower limit of the target temperature range, the PTC relay is closed to start heating.

[0008] Preferably, it further includes a protection module, the protection module comprising: A temperature control switch, located on the surface of the PTC heater, is configured to disconnect the circuit when the surface temperature of the PTC heater exceeds 110°C and automatically reset when the temperature drops below 75°C. A fuse, connected in series with the circuit of the PTC heater, is configured to melt and permanently disconnect the circuit when the surface temperature of the PTC heater exceeds 184°C.

[0009] Preferably, the control unit is signal-connected to the blower and the servo motor of the heating and cooling temperature damper to receive their status input.

[0010] Preferably, the control unit is further configured to prevent the PTC heater from starting under the following conditions: The blower speed signal is zero; A blower circuit fault was detected. The temperature control damper is not in warm air mode; The temperature detected by the outlet air temperature sensor exceeds 68°C.

[0011] The technical effects and advantages of this utility model are as follows: By using the control unit to perform closed-loop regulation of the PTC relay based on the real-time feedback of the air outlet temperature sensor, the frequency of invalid start-up of the PTC heater can be significantly reduced. Compared with the existing fixed power mode, the heating energy consumption in winter can be reduced by 1.4kw. At an ambient temperature of -7℃, the WLTP range of the whole vehicle can be increased by 14km, effectively alleviating the low-temperature range anxiety of new energy vehicles.

[0012] Based on the "multi-level target temperature range" design, users can select the appropriate level through the temperature setting module. The control unit then uses closed-loop regulation to stabilize the air outlet temperature within the corresponding range, avoiding problems such as "excessive temperature or lack of fine-tuning", meeting the heating needs of different passengers and improving the comfort experience. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the circuit connection of this utility model.

[0014] In the diagram: 1. PTC heater; 2. Outlet air temperature sensor; 3. Control unit; 4. PTC relay. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0016] This invention provides, for example Figure 1 The vehicle air PTC heating control device shown includes: The temperature setting module allows users to set the heating level. PTC heater 1 is installed inside the air conditioning unit and is used to heat the air; The outlet air temperature sensor 2 is installed on the outlet side of the PTC heater 1 to monitor the outlet air temperature in real time. The PTC heater 1 is connected to a PTC relay 4, which controls the power supply to the PTC heater 1. The control unit 3 is electrically connected to the temperature setting module, the outlet air temperature sensor 2, and the PTC relay 4, respectively. The control unit 3 is configured to: determine the target temperature range based on the heating level, and control the switching state of the PTC relay 4 according to the feedback data of the air outlet temperature sensor 2, so as to realize closed-loop regulation of the air outlet temperature.

[0017] By using the control unit 3 to perform closed-loop regulation of the PTC relay 4 based on the real-time feedback from the outlet air temperature sensor 2, the frequency of invalid activation of the PTC heater 1 can be significantly reduced. Compared with the existing fixed power mode, the heating energy consumption in winter can be reduced by 1.4kw. At an ambient temperature of -7℃, the vehicle's WLTP range can be increased by 14km, effectively alleviating the range anxiety of new energy vehicles in low temperatures.

[0018] Furthermore, the temperature setting module includes multiple settings, each corresponding to a preset target temperature range, and the settings include: Level 1: Target temperature range is 30℃~35℃; Level 2: Target temperature range is 35℃~40℃; Level 3: Target temperature range is 40℃~50℃; Level 4: Target temperature range is 50℃~60℃.

[0019] Furthermore, the control unit 3 is specifically configured as follows: When the outlet air temperature reaches the upper limit of the target temperature range, the PTC relay 4 is disconnected to stop heating; When the outlet air temperature drops to the lower limit of the target temperature range, the PTC relay 4 is closed to start heating.

[0020] Based on the "multi-level target temperature range" design, users can select the appropriate level through the temperature setting module. The control unit 3 then uses closed-loop regulation to stabilize the air outlet temperature within the corresponding range, avoiding the problems of "excessive temperature or lack of fine-tuning", meeting the heating needs of different passengers and improving the comfort experience.

[0021] Furthermore, it also includes a protection module, which comprises: A temperature control switch is provided on the surface of the PTC heater 1 and is configured to disconnect the circuit when the surface temperature of the PTC heater 1 exceeds 110°C and automatically reset when the temperature drops below 75°C. A fuse, connected in series in the circuit of the PTC heater 1, is configured to melt and permanently disconnect the circuit when the surface temperature of the PTC heater 1 exceeds 184°C.

[0022] The device integrates "2 outlet air temperature sensors + temperature control switch + fuse": Level 1 protection (outlet air temperature): When the outlet air temperature sensor 2 detects that the temperature exceeds 68℃, the control unit 3 prohibits the PTC heater 1 from starting to avoid overheating of the hot air; Secondary protection (surface temperature): When the surface temperature of PTC heater 1 exceeds 110℃, the temperature control switch automatically disconnects the circuit and resets when the temperature drops below 75℃, thus achieving dynamic overheat protection; Level 3 protection (extreme overheating): When the surface temperature exceeds 184°C, the fuse will permanently blow, completely cutting off the circuit, preventing thermal runaway under extreme conditions, and ensuring the electrical safety of the entire vehicle.

[0023] Furthermore, the control unit 3 is connected to the blower and the servo motor of the heating and cooling temperature damper to receive their status input.

[0024] Furthermore, the control unit 3 is also configured to prevent the PTC heater 1 from starting under the following conditions: The blower speed signal is zero; A blower circuit fault was detected. The temperature control damper is not in warm air mode; The temperature detected by the outlet air temperature sensor 2 exceeds 68°C.

[0025] Control unit 3 is linked with the blower and the servo motor of the heating and cooling damper. Only when all four conditions are met simultaneously, such as "blower speed is not zero, there is no blower circuit fault, the heating and cooling damper is in the warm air state, and the outlet air temperature is ≤68℃", the PTC relay 4 is allowed to close and start the PTC heater 1, thus eliminating ineffective energy consumption and safety hazards such as "heating without air" and "heating with damper misalignment".

[0026] Working principle: Users select the heating level (level 1 to level 4) through the temperature setting module, which transmits the level signal to the control unit 3; The control unit 3 calls the preset "gear level - target temperature range" correspondence (e.g., gear level 4 corresponds to 50℃~60℃), determines the air outlet temperature control range under the current operating conditions, and completes the heating target setting.

[0027] Control unit 3 synchronously receives the blower speed signal, blower circuit fault diagnosis signal, and damper status signal fed back by the hot and cold temperature damper servo motor; Meanwhile, the outlet air temperature sensor 2 collects the temperature of the outlet side of the PTC heater 1 in real time and transmits the data to the control unit 3; Control unit 3 will only allow PTC heating to be activated if all of the following conditions are met: ① Blower speed signal ≠ 0 (blower is operating normally); ②No blower circuit fault; ③The temperature damper is in "warm air mode" (hot air can be sent into the passenger cabin). ④ The outlet air temperature sensor 2 detects a temperature ≤68℃.

[0028] Once the startup conditions are met, the control unit 3 sends a closing signal to the PTC relay 4, the PTC relay 4 connects the power supply, the PTC heater 1 starts and heats the air inside the air conditioning unit, and the hot air is sent into the passenger cabin by the blower. The outlet air temperature sensor 2 continuously monitors the outlet air temperature and feeds the data back to the control unit 3 in real time. ① When the outlet air temperature reaches the upper limit of the target temperature range (e.g., 60℃ at level 4), the control unit 3 sends a disconnect signal, the PTC relay 4 disconnects, and the PTC heater 1 stops heating; ② After heating stops, the outlet air temperature gradually decreases. When the outlet air temperature sensor 2 detects that the temperature has dropped to the lower limit of the target temperature range (such as 50℃ at level 4), the control unit 3 sends a closing signal again, the PTC relay 4 closes, and the PTC heater 1 restarts heating. Repeat the above "start-stop" cycle to achieve stable control of the outlet air temperature within the target range, ensuring heating effect while reducing ineffective energy consumption.

[0029] If the outlet air temperature sensor 2 detects a temperature >68℃ during the heating process, the control unit 3 immediately disconnects the PTC relay 4 to prevent the PTC heater 1 from working until the temperature drops to a safe range. If the surface temperature of PTC heater 1 is >110℃, the temperature control switch on its surface will automatically disconnect the circuit and stop heating; when the temperature drops to below 75℃, the temperature control switch will automatically reset, and the control unit 3 can control the PTC relay 4 again according to the air outlet temperature requirement. If the surface temperature continues to rise to >184℃ (when the secondary protection fails), the fuse connected in series in the PTC heater 1 circuit will permanently blow, completely cutting off the power supply and preventing thermal runaway. At this time, the fuse needs to be replaced to restore the system function.

[0030] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A vehicle air PTC heating control device, characterized in that, include: The temperature setting module allows users to set the heating level. PTC heater (1), installed inside the air conditioning unit, is used to heat the air; An air outlet temperature sensor (2) is installed on the air outlet side of the PTC heater (1) to monitor the air outlet temperature in real time. The PTC heater (1) is connected to a PTC relay (4), which controls the power supply to the PTC heater (1). The control unit (3) is electrically connected to the temperature setting module, the air outlet temperature sensor (2), and the PTC relay (4), respectively. The control unit (3) is configured to: determine the target temperature range based on the heating level, and control the switching state of the PTC relay (4) according to the feedback data of the air outlet temperature sensor (2) to achieve closed-loop regulation of the air outlet temperature.

2. The vehicle air PTC heating control device according to claim 1, characterized in that, The temperature setting module includes multiple settings, each corresponding to a preset target temperature range. The settings include: Level 1: Target temperature range is 30℃~35℃; Level 2: Target temperature range is 35℃~40℃; Level 3: Target temperature range is 40℃~50℃; Level 4: Target temperature range is 50℃~60℃.

3. The vehicle air PTC heating control device according to claim 1, characterized in that, The control unit (3) is specifically configured as follows: When the outlet air temperature reaches the upper limit of the target temperature range, disconnect the PTC relay (4) to stop heating; When the outlet air temperature drops to the lower limit of the target temperature range, the PTC relay (4) is closed to start heating.

4. The vehicle air PTC heating control device according to claim 1, characterized in that, It also includes a protection module, which comprises: A temperature control switch is provided on the surface of the PTC heater (1) and is configured to disconnect the circuit when the surface temperature of the PTC heater (1) exceeds 110°C and automatically reset when the temperature drops below 75°C. A fuse, connected in series with the circuit of the PTC heater (1), is configured to melt and permanently disconnect the circuit when the surface temperature of the PTC heater (1) exceeds 184°C.

5. The vehicle air PTC heating control device according to claim 1, characterized in that, The control unit (3) is connected to the blower and the servo motor of the heating and cooling damper to receive their status input.

6. The vehicle air PTC heating control device according to claim 5, characterized in that, The control unit (3) is also configured to prevent the PTC heater (1) from starting under the following conditions: The blower speed signal is zero; A blower circuit fault was detected. The temperature control damper is not in warm air mode; The temperature detected by the outlet air temperature sensor (2) exceeds 68°C.

Images