Commercial vehicle carpet, carpet heating system and vehicle
By designing air ducts on the carpet of commercial vehicles and connecting them to an independent heating system, combined with temperature sensor control, the problem of uneven heating throughout the cab of commercial vehicles has been solved, improving the comfort and safety of passengers' feet when parked.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- FAW JIEFANG AUTOMOTIVE CO
- Filing Date
- 2026-03-30
- Publication Date
- 2026-05-05
AI Technical Summary
Existing commercial vehicle heating methods cannot achieve uniform heating throughout the cab, especially in the foot areas of the driver and passenger seats, which affects passenger comfort and safety when parked in winter.
The carpet is designed with air ducts that connect to an independent heating system, allowing warm air to be conducted to the foot area through the carpet surface. Temperature sensors are also included for automatic control to prevent localized overheating.
It achieves rapid and uniform heating of the cab floor area, improving passenger foot comfort, saving energy, and reducing costs.
Smart Images
Figure CN121973689A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of commercial vehicle heating technology, specifically relating to a commercial vehicle carpet, a carpet heating system, and the vehicle. Background Technology
[0002] With the continuous improvement of living standards in modern society, commercial vehicle users have increasingly higher requirements for thermal comfort in the cab. As the main activity space for commercial vehicle drivers and passengers, the quality of the cab's thermal environment directly affects the physical experience, work efficiency, and rest quality of drivers and passengers. Especially in low-temperature conditions in winter, improving the thermal comfort of the cab has become one of the key competitive factors in the commercial vehicle market.
[0003] Currently, in winter driving conditions, commercial vehicles primarily rely on the onboard air conditioning system for heating the cab. This system blows warm air into the cab through vents located in the dashboard area to raise the internal temperature. However, when parked, since the driving air conditioning cannot operate continuously, commercial vehicles typically use an independent heater located below the sleeper berth. This heater blows warm air into the front of the cab through vents located on the sleeper berth partition to maintain a basic temperature inside the cab.
[0004] However, both of the above heating methods have obvious technical defects: on the one hand, whether it is the air conditioning heating under driving conditions or the independent heater under parking conditions, the warm air is blown out through the air outlet, which has the problem of a small coverage area of warm air and cannot achieve uniform heating of the entire cab, resulting in a slow overall heating speed of the cab; on the other hand, the heating effect of the above heating methods on the foot areas of the driver and passenger is extremely poor. Since the foot area is located at the bottom of the cab and far from the air outlet, the warm air is difficult to reach effectively, so the temperature of the foot areas of the driver and passenger remains at a low level for a long time, and the occupants are prone to discomfort symptoms such as cold feet and stiff limbs.
[0005] Commercial vehicle drivers often face scenarios such as waiting for goods while parked or taking long-distance rest stops. In these situations, occupants spend extended periods inside the cab, further amplifying the shortcomings of the aforementioned heating methods. This results in extremely poor thermal comfort in the cab, severely impacting the quality of rest for drivers and passengers. Prolonged exposure to low-temperature feet can also affect their health and subsequent driving safety. This problem is particularly pronounced in frigid northern regions or extremely cold operating environments.
[0006] Therefore, developing an independent heating system capable of heating the floor area of the commercial vehicle cab and rapidly raising the foot temperature to address the shortcomings of existing technologies has become an urgent technical problem in the current commercial vehicle industry, and has significant market application value and practical significance. Summary of the Invention
[0007] The purpose of this invention is to provide a commercial vehicle carpet, a carpet heating system, and a vehicle. By creating air ducts in the carpet body, which are connected to an independent heating system, warm air can be quickly transferred from the carpet surface to the foot areas of the driver and passenger seats. Temperature sensors are placed in the carpet area to achieve automatic temperature control, avoiding excessive local temperature and improving the comfort of foot heating for passengers. The structure is simple and low-cost. It uses the waste heat from the independent heating system to heat the floor of the cab, solving the problem of the difficulty in quickly heating the foot areas of the driver and passenger seats when the commercial vehicle is parked in winter, while also achieving energy saving.
[0008] The specific details of the plan are as follows:
[0009] A commercial vehicle carpet includes a carpet body and carpet air ducts. The carpet body has a multi-layer structure. The carpet air ducts are spaced apart along the X direction between the top and bottom layers of the carpet body. One end of the carpet air duct is used to connect with the corresponding heating air duct in an independent heating system, and the other end is used to connect with the foot heating area of the driver and passengers.
[0010] In this invention, the X-axis corresponds to the longitudinal direction of the vehicle body (length); the Y-axis corresponds to the transverse direction (width); and the Z-axis corresponds to the vertical direction (height). This invention features a structural design for the carpet in the driver's cab, with two carpet air ducts running through it. These ducts are located on the left and right sides of the cab, corresponding to the driver's and passenger's seats, respectively. A thermal insulation foam material is sprayed onto the upper part of the vehicle body floor as the main thermal insulation layer for the carpet. This closed-cell structure of the thermal insulation foam material provides low thermal conductivity, natural insulation, waterproofing, moisture resistance, lightweighting, and shock absorption. As the carpet substrate, it shapes and supports the carpet, preventing wrinkles and slippage, and adheres well to the vehicle body panels, simplifying assembly and improving installation consistency. The thermal insulation foam material uses automotive-grade modified foams such as EPP, PU foam, and XPE, meeting requirements for low odor, low VOC, flame retardancy, and aging resistance, thus improving in-vehicle air quality. The rigid support layer is an injection-molded rubber layer, providing shaping, support, and wear resistance. A filling layer made of polyurethane foam is placed between the thermal insulation layer and the rigid support layer. Carpet air ducts are installed within this filling layer. The low thermal conductivity of polyurethane foam allows the air ducts to be integrated within the foam, preventing heat loss laterally and downwards, ensuring heat rises and improving the efficiency of the floor heating system, reducing energy consumption, and enhancing heating performance. Multiple reinforcing ribs are evenly spaced between the filling layers to enhance the carpet's load-bearing capacity. These ribs are made of rubber and can be integrally injection-molded with the rigid support layer.
[0011] The carpet-guided air ducts are spaced apart within the filling layer, including a first carpet-guided air duct and a second carpet-guided air duct. These two ducts are located on the left and right sides respectively, running alternately along the X-axis within the filling layer. Their overall shape matches other facilities on the cab floor, prioritizing maximum heating. Both the first and second carpet-guided air ducts are equipped with control valves to control the heating supply. These control valves can be solenoid valves. When the temperature sensor in the driver's and passenger's foot area indicates a temperature above 45°C, the control valve closes to stop the heating supply; when the foot temperature drops below 40°C, the control valve opens to resume heating. Excessive foot heating in the cab can cause extreme discomfort for passengers; this design saves energy and improves passenger comfort.
[0012] The first and second carpet air ducts are connected to the functional air ducts of the independent heating system. The independent heating system includes a heater assembly, a transition air duct, a driver-side air duct, a passenger-side air duct, and two temperature sensors. One end of the transition air duct is connected to the heater assembly, and the other end is connected to the driver-side and passenger-side air ducts, forming a Y-shaped split air duct. The driver-side and passenger-side air ducts are arranged to the left and right along the X direction, and their air outlets face the passenger area of the cab. The starting ends of the first and second carpet air ducts are respectively connected to the starting ends of the driver-side and passenger-side air ducts. The ending ends of the first and second carpet air ducts are respectively connected to the foot heating areas of the driver and passenger. The two temperature sensors are respectively installed in corresponding positions in the cab to detect the temperature under the driver's and passenger's feet.
[0013] Furthermore, the carpet body includes a heat insulation layer, a rigid support surface layer, a filling layer, and multiple reinforcing ribs. The heat insulation layer is fixedly connected to the bottom layer of the carpet body for fixed connection with the white body floor. The rigid support surface layer is fixedly connected to the top layer of the carpet body. The filling layer is fixedly connected between the heat insulation layer and the rigid support surface layer. Multiple reinforcing ribs are evenly spaced between the filling layers to enhance the carpet's load-bearing capacity.
[0014] Furthermore, the thermal insulation layer is made of thermal insulation foam material.
[0015] Furthermore, the filler layer is made of polyurethane foam.
[0016] Furthermore, the rigid support surface layer is an injection-molded rubber layer.
[0017] Small holes / slanted holes / arrayed holes can be made on the upper layer of the rigid support surface to accelerate convection and allow hot air to rise quickly. Preferably, this invention sets an array of slanted airflow guide holes at the location corresponding to the internal heating air duct of the polyurethane foam on the rigid support rubber surface layer. The slanted airflow guide holes facilitate upward convection and diffusion of warm air along a preset direction, accelerating the heating speed of the passengers' feet and improving the heat energy utilization rate of the independent parking heater. Simultaneously, the slanted holes have the functions of preventing sand and gravel, preventing water ingress, and reducing wind noise, achieving uniform airflow while ensuring Z-axis support strength, thus optimizing cabin heating comfort and overall vehicle NVH performance.
[0018] Furthermore, the reinforcing ribs are made of rubber, and the reinforcing ribs and the rigid support surface layer are integrally injection molded structures.
[0019] Furthermore, the carpet air duct includes a first carpet air duct and a second carpet air duct. The first carpet air duct and the second carpet air duct are spaced apart in the filling layer along the X direction. Both the first carpet air duct and the second carpet air duct are equipped with control valves to realize the start and stop control of the warm air supply.
[0020] A carpet heating system is applied to the cab of a commercial vehicle. It includes the commercial vehicle carpet, an independent heating system, and an electronic control unit. The independent heating system includes a heater assembly, a transition duct, a driver-side duct, a passenger-side duct, and two temperature sensors. One end of the transition duct is connected to the heater assembly, and the other end is connected to the driver-side and passenger-side ducts, forming a Y-shaped split duct. The driver-side and passenger-side ducts are arranged along the X-direction, with their air outlets facing the passenger area of the cab. The starting ends of a first carpet air guide duct and a second carpet air guide duct are respectively connected to the starting ends of the driver-side and passenger-side ducts. The ends of the first and second carpet air guide ducts are respectively connected to the foot heating areas of the driver and passenger. The two temperature sensors are respectively located in corresponding positions within the cab to detect the temperature under the driver's and passenger's feet. The control valve and the independent heating system are electrically connected to the electronic control unit.
[0021] Currently, independent heating systems are the mainstream for commercial vehicles when parked. This invention prioritizes diesel-powered heating as the preferred technical solution. Independent heating provides heating independently after the engine is turned off, reducing idling wear and high fuel consumption. Fuel consumption is approximately 0.2–0.5L per hour, significantly lower than idling. Stable operation even at -30℃ ensures cab temperature and engine start-up, crucial for transportation safety and efficiency. Compared to idling heating, fuel savings can reach 70%, resulting in a significant long-term cost advantage.
[0022] The carpet heating design of this invention allows heat to quickly diffuse from the carpet surface into the driver's cabin, significantly increasing heating speed and ensuring even distribution. This avoids concentrated hot air blowing directly onto the feet from fixed vents, preventing discomfort from localized overheating. Furthermore, utilizing the commercial vehicle's own independent heating system for preheating saves energy and reduces costs.
[0023] Furthermore, when the foot area temperature exceeds 45°C, the control valve closes to stop the supply of warm air; when the foot temperature falls below 40°C, the control valve opens to resume the supply of warm air.
[0024] A vehicle includes the aforementioned carpet heating system, and further includes a driver's side foot heating air vent and a passenger side foot heating air vent. The end of a first carpet air duct is connected to the driver's side foot air vent, and the end of a second carpet air duct is connected to the passenger side foot air vent. Two temperature sensors are respectively fixedly connected below the driver's side foot area and below the passenger side foot area. An electronic control unit is located inside the vehicle.
[0025] Compared with the prior art, the present invention has the following advantages:
[0026] This invention redesigns the carpet in the driver's cab by creating air ducts on the carpet body, which are connected to an independent heating system. This allows warm air to be quickly transferred from the carpet surface to the foot areas of the driver and passenger. Temperature sensors are placed in the carpet area to achieve automatic temperature control, preventing localized overheating and improving the comfort of foot heating for occupants. The invention is simple in structure and low in cost, and uses the waste heat from the independent heating system to heat the cab floor. This solves the problem of the driver and passenger foot areas being difficult to heat up quickly when commercial vehicles are parked in winter, while also achieving energy conservation. Attached Figure Description
[0027] Figure 1 This is a schematic diagram of the vertical cross-section of the carpet according to the present invention.
[0028] Figure 2 This is a schematic diagram of the independent heating system of the present invention without the carpet-connected air duct.
[0029] Figure 3 This is a schematic diagram of the overall connection of the carpet heating system of the present invention.
[0030] In the picture:
[0031] 1. Carpet body; 1.1. Thermal insulation layer; 1.2. Rigid support surface layer; 1.3. Filling layer; 1.4. Multiple reinforcing ribs; 2. Carpet air duct; 2.1. First carpet air duct; 2.2. Second carpet air duct; 2.3. Control valve; 3. Independent heating system; 3.1. Heater assembly; 3.2. Transition air duct; 3.3. Driver's side air duct; 3.4. Passenger's side air duct; 3.5. Temperature sensor; 4. Driver's side foot vent; 5. Passenger's side foot vent. Detailed Implementation
[0032] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.
[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.
[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.
[0035] The following combination Figure 1 , Figure 2 and Figure 3 The present invention will be described in conjunction with the embodiments:
[0036] Example 1:
[0037] A type of commercial vehicle carpet, see Figure 1As shown, it includes a carpet body 1 and a carpet air duct 2. The carpet body 1 has a multi-layer structure. The carpet air duct 2 is intermittently installed between the top and bottom layers of the carpet body 1 along the X direction. One end of the carpet air duct 2 is used to connect to the corresponding heating air duct in the independent heating system 3, and the other end is used to connect to the air outlet below the driver's seat / passenger seat.
[0038] The carpet body 1 includes a heat insulation layer 1.1, a rigid support surface layer 1.2, a filling layer 1.3, and multiple reinforcing ribs 1.4. The heat insulation layer 1.1 is fixedly connected to the bottom layer of the carpet body 1 for fixed connection with the white car floor. The rigid support surface layer 1.2 is fixedly connected to the top layer of the carpet body 1. The filling layer 1.3 is fixedly connected between the heat insulation layer 1.1 and the rigid support surface layer 1.2. The multiple reinforcing ribs 1.4 are evenly spaced between the filling layers 1.3 to enhance the load-bearing capacity of the carpet.
[0039] The material of the thermal insulation layer 1.1 is thermal insulation foam.
[0040] The filler layer 1.3 is made of polyurethane foam.
[0041] The rigid support surface layer 1.2 is an injection-molded rubber layer.
[0042] The reinforcing rib 1.4 is made of rubber, and the reinforcing rib 1.4 and the rigid support surface layer 1.2 are integrally injection molded structures.
[0043] The carpet air duct 2 includes a first carpet air duct 2.1 and a second carpet air duct 2.2. The first carpet air duct 2.1 and the second carpet air duct 2.2 are spaced apart in the filling layer 1.3 along the X direction. Both the first carpet air duct 2.1 and the second carpet air duct 2.2 are equipped with control valves 2.3 for controlling the supply or cutoff of warm air.
[0044] Example 2:
[0045] A type of commercial vehicle carpet, see Figure 1 As shown, it includes a carpet body 1 and a carpet air duct 2. The carpet body 1 has a multi-layer structure. The carpet air duct 2 is intermittently installed between the top and bottom layers of the carpet body 1 along the X direction. One end of the carpet air duct 2 is used to connect to the corresponding heating air duct in the independent heating system 3, and the other end is used to connect to the air outlet below the driver's seat / passenger seat.
[0046] The carpet body 1 includes a heat insulation layer 1.1, a rigid support surface layer 1.2, a filling layer 1.3, and multiple reinforcing ribs 1.4. The heat insulation layer 1.1 is fixedly connected to the bottom layer of the carpet body 1 for fixed connection with the white car floor. The rigid support surface layer 1.2 is fixedly connected to the top layer of the carpet body 1. The filling layer 1.3 is fixedly connected between the heat insulation layer 1.1 and the rigid support surface layer 1.2. The multiple reinforcing ribs 1.4 are evenly spaced between the filling layers 1.3 to enhance the load-bearing capacity of the carpet.
[0047] The material of the thermal insulation layer 1.1 is thermal insulation foam.
[0048] The filler layer 1.3 is made of polyurethane foam.
[0049] The rigid support surface layer 1.2 is an injection-molded rubber layer. An array of oblique airflow guide holes are set in the rigid support rubber surface layer at the position corresponding to the heating air duct inside the polyurethane foam. The oblique airflow guide holes facilitate the upward convection and diffusion of warm air in a preset direction, accelerate the heating speed of the passengers' feet, and improve the heat energy utilization rate of the independent parking heater. At the same time, the oblique holes have the functions of preventing sand and gravel, preventing water ingress, and reducing wind noise. While ensuring the Z-direction support strength, uniform air outlet is achieved, optimizing the cabin heating comfort and the overall vehicle NVH performance.
[0050] The reinforcing rib 1.4 is made of rubber, and the reinforcing rib 1.4 and the rigid support surface layer 1.2 are integrally injection molded structures.
[0051] The carpet air duct 2 includes a first carpet air duct 2.1 and a second carpet air duct 2.2. The first carpet air duct 2.1 and the second carpet air duct 2.2 are spaced apart in the filling layer 1.3 along the X direction. Both the first carpet air duct 2.1 and the second carpet air duct 2.2 are equipped with control valves 2.3 for controlling the supply or cutoff of warm air.
[0052] Example 3:
[0053] This invention also provides a carpet heating system for use in the cab of a commercial vehicle, see below. Figure 2 and Figure 3As shown, the commercial vehicle carpet includes an independent heating system 3. The independent heating system 3 includes a heater assembly 3.1, a transition air duct 3.2, a driver-side air duct 3.3, a passenger-side air duct 3.4, and two temperature sensors 3.5. One end of the transition air duct 3.2 is connected to the heater assembly 3.1. One end of the driver-side air duct 3.3 and the passenger-side air duct 3.4 are respectively connected to the transition air duct 3.2. The driver-side air duct 3.3 and the passenger-side air duct 3.4 are positioned corresponding to the driver's seat and the front passenger seat, respectively. The first carpet air guide duct 2.1 and the second carpet air guide duct 2.2 are respectively connected to the driver-side air duct 3.3 and the passenger-side air duct 3.4. The two temperature sensors 3.5 are respectively located in corresponding positions in the cab to detect the temperature under the driver's and passenger's feet. The control valve 2.3 and the independent heating system 3 are electrically connected to the electronic control unit.
[0054] When the foot area temperature exceeds 45℃, control valve 2.3 closes to stop the supply of warm air; when the foot temperature falls below 40℃, control valve 2.3 opens to resume the supply of warm air.
[0055] Example 4:
[0056] The present invention also provides a vehicle including the aforementioned carpet heating system, further including a driver's side foot heating air vent and a passenger side foot heating air vent, the end of a first carpet air duct 2.1 being connected to the driver's side foot air vent 4, the end of a second carpet air duct 2.2 being connected to the passenger side foot air vent 5, two temperature sensors 3.5 being fixedly connected to the area below the driver's side foot area and the area below the passenger side foot area respectively, and an electronic control unit being located inside the vehicle.
[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A commercial vehicle carpet, characterized in that, It includes a carpet body (1) and a carpet air duct (2). The carpet body (1) has a multi-layer structure. The carpet air duct (2) is installed in the X direction between the top and bottom layers of the carpet body (1). One end of the carpet air duct (2) is used to connect with the corresponding heating air duct in the independent heating system (3), and the other end is used to connect with the foot heating area of the driver and passengers.
2. The commercial vehicle carpet according to claim 1, characterized in that, The carpet body (1) includes a heat insulation layer (1.1), a rigid support surface layer (1.2), a filling layer (1.3), and multiple reinforcing ribs (1.4). The heat insulation layer (1.1) is fixedly connected to the bottom layer of the carpet body (1) for fixed connection with the white car body floor. The rigid support surface layer (1.2) is fixedly connected to the top layer of the carpet body (1). The filling layer (1.3) is fixedly connected between the heat insulation layer (1.1) and the rigid support surface layer (1.2). Multiple reinforcing ribs (1.4) are evenly spaced between the filling layer (1.3) to enhance the load-bearing capacity of the carpet.
3. The commercial vehicle carpet according to claim 2, characterized in that, The heat insulation layer (1.1) is made of heat insulation foam material.
4. The commercial vehicle carpet according to claim 2, characterized in that, The filler layer (1.3) is made of polyurethane foam.
5. The commercial vehicle carpet according to claim 2, characterized in that, The rigid support surface layer (1.2) is an injection-molded rubber layer.
6. The commercial vehicle carpet according to claim 5, characterized in that, The reinforcing rib (1.4) is made of rubber, and the reinforcing rib (1.4) and the rigid support surface layer (1.2) are integrally injection molded structures.
7. The commercial vehicle carpet according to claim 2, characterized in that, The carpet air duct (2) includes a first carpet air duct (2.1) and a second carpet air duct (2.2). The first carpet air duct (2.1) and the second carpet air duct (2.2) are interspersed in the filling layer (1.3) along the X direction. Both the first carpet air duct (2.1) and the second carpet air duct (2.2) are equipped with control valves (2.3) for realizing the start and stop control of the warm air supply.
8. A carpet heating system, characterized in that, The vehicle carpet as described in any one of claims 1-7 further includes an independent heating system (3) and an electronic control unit. The independent heating system (3) includes a heater assembly (3.1), a transition duct (3.2), a driver-side duct (3.3), and a passenger-side duct (3.4), and two temperature sensors (3.5). One end of the transition duct (3.2) is connected to the heater assembly (3.1), and the other end of the transition duct (3.2) is connected to the driver-side duct (3.3) and the passenger-side duct (3.4) to form a Y-shaped split duct. The driver-side duct (3.3) and the passenger-side duct (3.4) are connected along the X-axis. The first carpet air duct (2.1) and the second carpet air duct (2.2) are arranged to the left and right, with their air outlets facing the passenger area of the cab. The starting ends of the first carpet air duct (2.1) and the second carpet air duct (2.2) are respectively connected to the starting ends of the driver side air duct (3.3) and the passenger side air duct (3.4). The ends of the first carpet air duct (2.1) and the second carpet air duct (2.2) are respectively connected to the foot heating area of the driver and the passenger. Two temperature sensors (3.5) are respectively set in the corresponding positions in the cab to detect the temperature under the driver's and passenger's feet. The control valve (2.3) and the independent heating system (3) are respectively electrically connected to the electronic control unit.
9. The carpet heating system according to claim 8, characterized in that, When the temperature of the foot area is higher than 45°C, the control valve (2.3) closes to stop the supply of warm air; when the temperature of the foot is lower than 40°C, the control valve (2.3) opens to resume the supply of warm air.
10. A vehicle, characterized in that, The system includes the carpet heating system as described in claim 8 or 9, and further includes a driver's side foot heating air outlet and a passenger side foot heating air outlet. The end of the first carpet air duct (2.1) is connected to the driver's side foot air outlet (4), and the end of the second carpet air duct (2.2) is connected to the passenger side foot air outlet (5). Two temperature sensors (3.5) are respectively fixedly connected to the area below the driver's side foot area and the area below the passenger side foot area. The electronic control unit is located inside the vehicle.