Cab air conditioning system with auxiliary heating, cab temperature control method and engineering machinery

Abstract

This invention discloses a cab air conditioning system with auxiliary heating, a cab temperature control method, and engineering machinery. It includes an air conditioning unit mounted on the cab, an auxiliary heating device, and a temperature control system. The air conditioning unit contains a heater core, which is circulated and heated by engine coolant. The heater core can output hot air at a preset temperature into the cab. The auxiliary heating device includes a fuel heater and a heater oil pump. The heater oil pump is connected between the fuel tank and the fuel heater via an oil pipe. The fuel heater can output hot air at a preset temperature into the cab. The temperature control system includes a controller and multiple temperature sensors for controlling the air conditioning unit and the auxiliary heating device to heat the cab. This invention can ensure rapid heating of the cab in extremely cold environments (below -30°C) while saving fuel, and avoids the driver frequently refueling in extremely cold environments (below -30°C).

Description

Technical Field

[0001] This invention relates to a cab air conditioning system with auxiliary heating and a cab temperature control method, belonging to the field of engineering machinery technology. Background Technology

[0002] A published patent, CN 221188038.U, describes an auxiliary heating device for a driver's cab and a mining dump truck. The device includes a fuel tank for fuel storage, a fuel heater, and an electromagnetic pump fuel line assembly. The fuel tank is installed at the rear of the driver's cab. The fuel heater is installed at the rear of the driver's cab to exchange the released heat with the cold air inside the cab. The electromagnetic pump fuel line assembly is also installed at the rear of the driver's cab, with one end connected to the fuel tank and the other end connected to the fuel heater, used to transfer fuel from the tank to the heater. This technical solution is suitable for auxiliary heating in dump trucks operating in cold northern regions when the driver's cab lacks sufficient heating. The auxiliary heating effect is achieved by using a fuel heater to burn diesel fuel, releasing heat to exchange with the cold air inside the cab.

[0003] The technical solutions disclosed in the above patents have the following shortcomings: Main problem 1: In the past, the auxiliary heating device and the air conditioning indoor unit were controlled independently. In extremely cold environments (below -30℃), when the engine coolant temperature is low, the air conditioning indoor unit cannot heat up in time. Drivers are used to using the fuel heater first. If the driver still only uses the fuel heater after the engine coolant temperature rises, it will lead to fuel waste.

[0004] Main problem 2: In the past, the auxiliary heating device and the air conditioning unit were controlled independently, which made it difficult to quickly heat up the cab in extremely cold environments (below -30℃) and to maintain a constant temperature in the cab, thus failing to provide the driver with a comfortable working temperature.

[0005] Main problem 3: The fuel tanks equipped with the auxiliary heating devices in the past were small, and the fuel was used up too quickly, requiring the driver to refuel frequently in extremely cold environments (below -30°C).

[0006] The reason for problem 1: Excavator cab heating generally relies on the waste heat of engine coolant. The heated coolant is pumped to the heating element of the air conditioning unit. Turning on the air conditioning fan will warm the cold air in the cab. However, the lowest temperature that conventional air conditioning is suitable for is -30℃. If the ambient temperature of the excavator is below -30℃, not only will conventional air conditioning be unable to provide a comfortable working environment for the driver, but the engine coolant temperature will also take a certain amount of time to rise. During this period, the air conditioning cannot heat up in time, and the driver is used to using the fuel heater for heating. If the driver still only uses the fuel heater for heating after the engine coolant temperature has risen, it will waste fuel.

[0007] The reason for problem 2: The air conditioning unit has the advantage of saving energy and the fuel heater has the advantage of rapid heating. However, in the past, the auxiliary heating device and the air conditioning system were controlled independently, making it difficult to achieve the coordinated work of the air conditioning unit and the auxiliary heating device in extremely cold environments (below -30℃) so that the temperature in the driver's cab can quickly reach the preset value and achieve constant temperature control, providing the driver with a comfortable working temperature.

[0008] The reason for problem 3: Traditional auxiliary heating devices are usually only equipped with a small 10L or 20L fuel tank, requiring drivers to frequently refuel in extremely cold environments (below -30℃). Summary of the Invention

[0009] In view of the problems existing in the above technical solutions, the present invention provides a cab air conditioning system with auxiliary heating and a cab temperature control method, which can ensure rapid heating of the cab in extremely cold environments (below -30℃) while saving fuel, and avoid drivers from frequently refueling in extremely cold environments (below -30℃).

[0010] This invention is implemented according to the following technical solution: In a first aspect, the present invention provides a cab air conditioning system with auxiliary heating, comprising: The air conditioning unit installed in the cab has a heating core inside. The heating core is heated by circulating engine coolant and can output hot air at a preset temperature into the cab. An auxiliary heating device mounted on the cab includes a fuel heater and a heater oil pump. The heater oil pump is connected between the fuel tank and the fuel heater via an oil pipe. The fuel heater is capable of outputting hot air at a preset temperature into the cab. The temperature control system mounted on the cab includes a controller and multiple temperature sensors, used to control the air conditioning unit and auxiliary heating devices to achieve the following cab heating methods: Heating Phase 1: When the temperature inside the cab is detected as not reaching the set temperature, the air conditioning unit and / or auxiliary heating device operate at maximum power to ensure that the cab heats up quickly and reaches the set temperature. Heating Phase Two: When the temperature inside the driver's cabin reaches the set temperature, the air conditioning unit is used first to maintain the set temperature. If both the air conditioning unit and the auxiliary heating device need to heat the cabin simultaneously to maintain the set temperature, the power of the auxiliary heating device is reduced first.

[0011] In some embodiments, the engine oil tank and the heater oil tank are integrated to form the fuel tank, and the fuel tank is equipped with a T-connector, which is connected to the oil inlet pipes of the engine and the heater oil pump respectively.

[0012] In some embodiments, the plurality of temperature sensors include at least: The heater core temperature sensor is installed on the heater core and is used to transmit the detected engine coolant temperature to the controller. An interior temperature sensor, installed in the driver's cab, is used to transmit the detected temperature inside the driver's cab to the controller. An outdoor temperature sensor, installed outside the driver's cab, is used to transmit the detected temperature outside the driver's cab to the controller.

[0013] In some embodiments, the fuel heater is installed on the lower part of the cab floor, which has an air inlet and an air outlet. The air inlet of the fuel heater is connected to the air inlet, and the air outlet of the fuel heater is connected to the air outlet. A seat mounting bracket is provided on the upper part of the cab floor, forming a mounting cavity between the two. The air outlet on the cab floor is located in the mounting cavity, dividing the inner and outer space of the seat mounting bracket into an air outlet cavity and an air inlet cavity. An air inlet is provided on the rear side of the seat mounting bracket, which is connected to the air outlet on the air unit through a foot blowing duct. An air outlet is provided on the front side of the seat mounting bracket. Hot air from the heater core and the fuel heater enters the mounting cavity and exits from the air outlet into the cab.

[0014] In some embodiments, the cab floor is provided with an air inlet duct at the air inlet for guiding airflow, and the cab floor is provided with an air outlet duct at the air outlet for guiding airflow, with the outlet of the air outlet duct facing the air outlet of the seat mounting bracket.

[0015] In some embodiments, a front baffle with a grille is fitted at the air outlet on the floor of the cab to isolate the air outlet duct from the driver.

[0016] In some embodiments, a mounting plate is provided on the bottom surface of the cab floor, a heater mounting bracket and a bracket sealing plate are assembled on the mounting plate, and the fuel heater is disposed in a storage cavity formed by the heater mounting bracket and the bracket sealing plate; the fuel heater is inspected by disassembling the heater mounting bracket and / or the bracket sealing plate.

[0017] In some embodiments, the indoor air conditioning unit is provided with an air outlet duct that communicates with the front air vent in the cab interior to blow hot air out to heat the front of the cab; the indoor air conditioning unit is provided with an air outlet duct that communicates with the rear air vent in the cab interior to blow hot air out to heat the rear of the cab; the indoor air conditioning unit is provided with an air inlet for internal circulation and an air inlet for external circulation.

[0018] Secondly, the present invention provides an engineering machinery, including the above-mentioned cab air conditioning system with auxiliary heating.

[0019] Thirdly, the present invention provides a method for controlling the temperature of a driver's cab, the details of which are as follows: An air conditioning unit equipped with a heating core is installed in the cab, and the heating core is heated by circulating engine coolant. An auxiliary heating device consisting of a fuel heater and a heater oil pump is installed in the cab. The heater oil pump is connected between the fuel tank and the fuel heater via an oil pipe. The operator turns on the "automatic heating" mode and sets the target temperature value on the control panel. First, the engine coolant temperature is detected by the heater core temperature sensor. If the engine coolant temperature is not higher than the minimum power outlet temperature of the auxiliary heating device, the auxiliary heating device will work independently and turn on its maximum heating power. If the engine coolant temperature is higher than the minimum power outlet temperature of the auxiliary heating device, the outdoor temperature sensor will then detect the outdoor temperature. If the outdoor temperature is lower than the minimum applicable temperature of the indoor air conditioner, the indoor air conditioner and the auxiliary heating device will work simultaneously and both will be turned on at their maximum heating power. If the outdoor temperature is not lower than the minimum applicable temperature of the indoor air conditioner, the indoor air conditioner will work alone and will be turned on at its maximum heating power. When the indoor temperature sensor detects that the indoor temperature has reached the set value, if only the auxiliary heating device is working, the power of the heater oil pump will be reduced and adjusted first, and then the power of the fuel heater will be reduced and adjusted to maintain the indoor temperature at the set value. If the indoor unit of the air conditioner and the auxiliary heating device are working simultaneously, the power of the heater oil pump will be reduced and adjusted first, then the power of the fuel heater will be reduced and adjusted, and finally the power of the indoor unit of the air conditioner will be adjusted to maintain the indoor temperature at the set value. If only the indoor unit of the air conditioner is working, the power of the indoor unit of the air conditioner will be reduced and adjusted to maintain the indoor temperature at the set value.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: The problem of wasted fuel is addressed by prioritizing the use of the air conditioning system for heating by detecting the engine coolant temperature and the outside temperature of the cab, and by reducing the power of the auxiliary heater once the cab temperature reaches the set value.

[0021] When the temperature inside the cab has not reached the set temperature, the air conditioning unit and auxiliary heating device operate at maximum power to ensure that the cab heats up quickly and reaches the set temperature, and maintains constant temperature control to provide the driver with a comfortable working temperature.

[0022] Integrating the heater tank and the engine diesel tank can solve the problem of the heater tank being too small, which causes the driver to frequently refuel in extremely cold environments (below -30°C), and it can also solve the problem of the limited space around the cab that prevents the installation of the heater tank.

[0023] It allows for sufficient space to install a fuel heater and makes its arrangement more flexible, while the seat mounting bracket structure does not need to be changed. It will not reduce seat comfort or the rigidity and strength of the base plate, and it will not obstruct the air conditioning from blowing into the cab, thus improving the air heating circulation efficiency. Attached Figure Description

[0024] The accompanying drawings, as part of this invention, are provided to further illustrate the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation thereof. Clearly, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0025] In the attached diagram: Figure 1 This is a layout diagram of the air conditioning system of the present invention; Figure 2 This is a layout diagram of the auxiliary heating device of the present invention; Figure 3 This is a diagram illustrating the heating operation of the indoor unit of the air conditioner and the auxiliary heating device of the present invention. Figure 4 This is an exploded view showing the connection between the fuel heater of the present invention and the cab; Figure 5 This is a partial view of the cab floor of the present invention; Figure 6 This is a partial view of the connection between the fuel heater of the present invention and the cab; Figure 7 This is a flowchart illustrating the integrated control process of the air conditioner indoor unit and auxiliary heating device according to the present invention. Figure 8 This is a control logic diagram for the integrated control of the indoor air conditioner unit and auxiliary heating device of the present invention.

[0026] Attached diagram labels: 1. Cab; 2. Fuel tank; 3. Heater pump protective plate; 4. T-joint; 5. Heater mounting bracket; 6. Control panel; 7. Suction pipe; 8. Heater pump; 9. Wiring harness; 10. Oil outlet pipe; 11. Fuel heater; 12. Controller; 13. Seat; 14. Cab floor; 15. Seat mounting bracket; 16. Air inlet duct; 17. Foot blowing duct; 18. Air conditioning indoor unit; 19. Heater core temperature sensor; 20. Indoor temperature sensor; 21. Outdoor temperature sensor; 22. Air outlet duct; 23. Front baffle; 24. Bracket sealing plate; 25. Mounting plate; 26. Bolt; 27. Air inlet; 28. Air outlet; 29. ​​Wiring hole; 30. Sealing sponge; 31. Air outlet duct; 32. Air outlet duct.

[0027] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 limiting this invention.

[0030] 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 a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] like Figure 1 As shown, a cab air conditioning system with auxiliary heating includes an indoor air conditioning unit 18 mounted on the cab 1, an auxiliary heating device, and a temperature control system. The indoor air conditioning unit 18 contains a heater core, which is circulated and heated by engine coolant (usually cooling water). The heater core can output hot air at a preset temperature into the cab 1. The auxiliary heating device includes a fuel heater 11 and a heater oil pump 8. The heater oil pump 8 is connected between the fuel tank 2 and the fuel heater 11 via an oil pipe. The fuel heater 11 can output hot air at a preset temperature into the cab 1. The temperature control system includes a controller 12 and multiple temperature sensors, used to control the indoor air conditioning unit 18 and the auxiliary heating device to achieve the following cab heating methods: Heating Phase 1: When the temperature inside the cab 1 is not reached, the air conditioning unit 18 and / or auxiliary heating device operate at maximum power to ensure that the cab 1 heats up quickly and reaches the set temperature. Heating Phase Two: When the temperature inside the cab 1 reaches the set temperature, the air conditioning unit 18 is used to heat the cab to maintain the set temperature. If the air conditioning unit 18 and the auxiliary heating device need to heat the cab simultaneously to maintain the set temperature, the power of the auxiliary heating device is reduced first.

[0032] As shown above, the problem of fuel waste is addressed by prioritizing the use of the air conditioning unit for heating by detecting the engine coolant temperature and the outside temperature of the cab, and by reducing the power of the auxiliary heater once the cab temperature reaches the set value. When the cab temperature has not reached the set temperature, both the air conditioning unit and the auxiliary heater can operate at maximum power simultaneously to ensure rapid heating of the cab to reach the set temperature and maintain a constant temperature, providing the driver with a comfortable working temperature.

[0033] The specific structure of the aforementioned auxiliary heating device will be further explained below.

[0034] like Figure 2 As shown, the auxiliary heating device includes a fuel heater 11, a heater oil pump 8, an oil suction pipe 7, an oil outlet pipe 10, and a wiring harness 9. The fuel heater 11 is installed below the cab floor 14, and the heater oil pump 8 is installed on the fuel tank 2. The fuel heater 11 and the heater oil pump 8 are connected through the oil outlet pipe 10, and the fuel tank 2 is connected to the oil inlet pipe 7 of the heater oil pump 8.

[0035] Further options, such as Figure 1 As shown, a heater oil pump protective plate 3 is also installed on the fuel tank 2 to protect the heater oil pump 8.

[0036] like Figure 1 As shown, a three-way connector 4 is installed on the fuel tank 2. The three-way connector 4 is connected to the fuel inlet pipe 7 of the engine and the heater oil pump 8 respectively. The fuel tank 2 provides fuel to the fuel heater 11 and the engine at the same time. That is, the integration of the engine fuel tank and the heater oil tank can prevent the heater oil tank from being too small, which would cause the driver to frequently refuel in extremely cold environments (below -30℃). It can also prevent the space around the cab 1 from being too small to install the heater oil tank.

[0037] like Figure 7 As shown, the multiple temperature sensors include at least a heater core temperature sensor 19, an indoor temperature sensor 20, and an outdoor temperature sensor 21. The heater core temperature sensor 19 is installed on the heater core and is used to transmit the detected engine coolant temperature to the controller 12. The indoor temperature sensor 20 is installed inside the cab 1 and is used to transmit the detected temperature inside the cab to the controller 12. The outdoor temperature sensor 21 is installed outside the cab 1 and is used to transmit the detected temperature outside the cab to the controller 12.

[0038] It should be noted that the fuel heater 11, heater oil pump 8, indoor temperature sensor 20, outdoor temperature sensor 21, air conditioner indoor unit 18, and control panel 6 are all connected to the controller 12 via wiring harness 9 to achieve integrated control of the auxiliary heating device and the air conditioner indoor unit 18.

[0039] The following provides a further explanation of the structure of the air conditioning unit and auxiliary heating device that blows hot air into the bottom of the cab.

[0040] like Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, the fuel heater 11 is installed on the lower part of the cab floor 14. The cab floor 14 has an air inlet 27 and an air outlet 28. The air inlet of the fuel heater 11 is connected to the air inlet 27, and the air outlet of the fuel heater 11 is connected to the air outlet 28. The upper part of the cab floor 14 has a seat mounting bracket 15, forming a mounting cavity between the two. The air outlet 28 on the cab floor 14 is located in the mounting cavity, dividing the inner and outer space of the seat mounting bracket 15 into an air outlet cavity and an air inlet cavity. The rear side of the seat mounting bracket 15 has an air inlet, which is connected to the air outlet on the air unit 18 through the foot blowing duct 17. The front side of the seat mounting bracket 15 has an air outlet. Hot air blown from the heater core and the fuel heater 11 enters the mounting cavity and is blown out of the air outlet into the cab 1.

[0041] As can be seen from the above, the present invention can provide sufficient space for the installation of a fuel heater and make its arrangement more flexible, while the seat mounting bracket structure does not need to be changed, thus not reducing seat comfort or the rigidity and strength of the base plate, and does not obstruct the air conditioning from blowing into the cab to make the air heating circulation more efficient.

[0042] Further options, such as Figure 4 , Figure 6 As shown, the cab floor 14 has an air inlet duct 16 at the air inlet 27 (the outlet can face forward or backward), and an air outlet duct 22 at the air outlet 28. The outlet of the air outlet duct 22 faces the air outlet of the seat mounting bracket 15, and the hot air will blow directly to the driver's feet, giving priority to warming the driver's feet.

[0043] It should be noted that the cab floor 14 is equipped with air intake and exhaust ducts. By arranging the air intake duct 16 outside the seat mounting bracket 15 and the air exhaust duct 22 inside the seat mounting bracket 15, the cab is divided into two air chambers to improve the air heating and circulation efficiency. The addition of air intake and exhaust ducts to the cab floor 14 allows the position of the lower fuel heater 11 to be adjusted according to the actual situation, making the arrangement of the fuel heater 11 more flexible.

[0044] Further options, such as Figure 4 As shown, a front baffle 23 with a grille is installed at the air outlet on the floor 14 of the cab to isolate the air outlet duct 22 from the driver and prevent the air outlet duct 22 from coming into contact with the driver's body, which could cause burns to the driver.

[0045] The following provides further explanation of the installation method for the aforementioned fuel heater.

[0046] like Figure 4 , Figure 6 As shown, a mounting plate 25 is provided on the bottom surface of the cab floor 14. The heater mounting bracket 5 and the bracket sealing plate 24 are assembled on the mounting plate 25. The fuel heater 11 is disposed in the storage cavity formed by the heater mounting bracket 5 and the bracket sealing plate 24. The fuel heater 11 can be inspected by disassembling the heater mounting bracket 5 and / or the bracket sealing plate 24.

[0047] It should be noted that the cab floor 14 is also provided with a wiring hole 29; a sealing sponge 30 is wrapped between the air outlet duct 22 and the air outlet of the fuel heater 11 to enhance the sealing effect between the air outlet duct 22 and the fuel heater 11. Similarly, a sealing sponge 30 is provided between the mounting plate 25 and the heater mounting bracket 5 and the bracket sealing plate 24 to enhance the sealing effect between the heater mounting bracket 5, the bracket sealing plate 24 and the mounting plate 25. The heater mounting bracket 5 and the bracket sealing plate 24 are both fixedly connected to the mounting plate 25 on the cab floor 14 by bolts 26. When maintenance of the fuel heater 11 is required, only the bolts 26 of the heater mounting bracket 5 and the bracket sealing plate 24 need to be removed, without removing the seat 13, which greatly simplifies the maintenance process.

[0048] The following provides a further explanation of the structure by which the air conditioning unit blows hot air into other parts of the driver's cab.

[0049] like Figure 3 As shown, the indoor air conditioning unit 18 is provided with an air outlet duct 31 for connecting with the front air vent in the interior of the cab 1, blowing hot air out to heat the front of the cab 1; the indoor air conditioning unit 18 is provided with an air outlet duct 32 for connecting with the rear air vent in the interior of the cab 1, blowing hot air out to heat the rear of the cab 1; the indoor air conditioning unit 18 is provided with an air inlet for realizing internal circulation and an air inlet for realizing external circulation.

[0050] like Figure 8 As shown, the present invention also provides a method for controlling the temperature of the driver's cab, the details of which are as follows: The operator turns on the "automatic heating" mode and sets the target temperature value on the control panel. First, the engine coolant temperature is detected by the heater core temperature sensor. If the engine coolant temperature is not higher than the minimum power outlet temperature of the auxiliary heating device, the auxiliary heating device will work independently and turn on its maximum heating power. If the engine coolant temperature is higher than the minimum power outlet temperature of the auxiliary heating device, the outdoor temperature sensor will then detect the outdoor temperature. If the outdoor temperature is lower than the minimum applicable temperature of the indoor air conditioner, the indoor air conditioner and the auxiliary heating device will work simultaneously and both will be turned on at their maximum heating power. If the outdoor temperature is not lower than the minimum applicable temperature of the indoor air conditioner, the indoor air conditioner will work alone and will be turned on at its maximum heating power. When the indoor temperature sensor detects that the indoor temperature has reached the set value, if only the auxiliary heating device is working, the power of the heater oil pump will be reduced and adjusted first, and then the power of the fuel heater will be reduced and adjusted to maintain the indoor temperature at the set value. If the indoor unit of the air conditioner and the auxiliary heating device are working simultaneously, the power of the heater oil pump will be reduced and adjusted first, then the power of the fuel heater will be reduced and adjusted, and finally the power of the indoor unit of the air conditioner will be adjusted to maintain the indoor temperature at the set value. If only the indoor unit of the air conditioner is working, the power of the indoor unit of the air conditioner will be reduced and adjusted to maintain the indoor temperature at the set value.

[0051] In summary, this invention provides a cab air conditioning system with auxiliary heating and a cab temperature control method, achieving the following functions and effects: The problem of wasted fuel is addressed by prioritizing the use of the air conditioning system for heating by detecting the engine coolant temperature and the outside temperature of the cab, and by reducing the power of the auxiliary heater once the cab temperature reaches the set value.

[0052] When the temperature inside the cab has not reached the set temperature, the air conditioning unit and auxiliary heating device operate at maximum power to ensure that the cab heats up quickly and reaches the set temperature, and maintains constant temperature control to provide the driver with a comfortable working temperature.

[0053] Integrating the heater tank and the engine diesel tank can solve the problem of the heater tank being too small, which causes the driver to frequently refuel in extremely cold environments (below -30°C), and it can also solve the problem of the limited space around the cab that prevents the installation of the heater tank.

[0054] It allows for sufficient space to install a fuel heater and makes its arrangement more flexible, while the seat mounting bracket structure does not need to be changed. It will not reduce seat comfort or the rigidity and strength of the base plate, and it will not obstruct the air conditioning from blowing into the cab, thus improving the air heating circulation efficiency.

[0055] The following describes the engineering machinery provided by the present invention. The engineering machinery described below can be referred to in correspondence with the cab air conditioning system with auxiliary heating described above.

[0056] The present invention provides an engineering machinery that may include a cab air conditioning system with auxiliary heating as described in any of the above embodiments.

[0057] The beneficial effects achieved by the engineering machinery provided by this invention are consistent with the beneficial effects achieved by the cab air conditioning system with auxiliary heating provided by this invention, so they will not be repeated here.

[0058] It should be noted that the aforementioned construction machinery can be excavators.

[0059] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0060] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A cab air conditioning system with auxiliary heating, characterized in that, include: The air conditioning unit installed in the cab has a heating core inside. The heating core is heated by circulating engine coolant and can output hot air at a preset temperature into the cab. An auxiliary heating device mounted on the cab includes a fuel heater and a heater oil pump. The heater oil pump is connected between the fuel tank and the fuel heater via an oil pipe. The fuel heater is capable of outputting hot air at a preset temperature into the cab. The temperature control system mounted on the cab includes a controller and multiple temperature sensors, used to control the air conditioning unit and auxiliary heating devices to achieve the following cab heating methods: Heating Phase 1: When the temperature inside the cab is detected as not reaching the set temperature, the air conditioning unit and / or auxiliary heating device operate at maximum power to ensure that the cab heats up quickly and reaches the set temperature. Heating Phase Two: When the temperature inside the driver's cabin reaches the set temperature, the air conditioning unit is used first to maintain the set temperature. If both the air conditioning unit and the auxiliary heating device need to heat the cabin simultaneously to maintain the set temperature, the power of the auxiliary heating device is reduced first.

2. The cab air conditioning system with auxiliary heating according to claim 1, characterized in that: The engine oil tank and the heater oil tank are integrated to form the fuel tank. The fuel tank is equipped with a T-connector, which is connected to the oil inlet pipes of the engine and the heater oil pump respectively.

3. The cab air conditioning system with auxiliary heating according to claim 1, characterized in that, The plurality of temperature sensors includes at least: The heater core temperature sensor is installed on the heater core and is used to transmit the detected engine coolant temperature to the controller. An interior temperature sensor, installed in the driver's cab, is used to transmit the detected temperature inside the driver's cab to the controller. An outdoor temperature sensor, installed outside the driver's cab, is used to transmit the detected temperature outside the driver's cab to the controller.

4. The cab air conditioning system with auxiliary heating according to claim 1, characterized in that: The fuel heater is installed on the lower part of the cab floor. The cab floor has an air inlet and an air outlet. The air inlet of the fuel heater is connected to the air inlet, and the air outlet of the fuel heater is connected to the air outlet. The upper part of the cab floor is provided with a seat mounting bracket, and a mounting cavity is formed between the two. The air outlet on the cab floor is located in the mounting cavity, dividing the inner and outer space of the seat mounting bracket into an air outlet cavity and an air inlet cavity. The rear side of the seat mounting bracket is provided with an air inlet, which is connected to the air outlet on the air unit through a foot blowing duct. The front side of the seat mounting bracket is provided with an air outlet. Hot air blown from the heater core and fuel heater enters the mounting cavity and is blown out of the air outlet into the cab.

5. The cab air conditioning system with auxiliary heating according to claim 4, characterized in that: The cab floor has an air inlet duct at the air inlet for guiding airflow, and an air outlet duct at the air outlet for guiding airflow, with the outlet of the air outlet oriented toward the air outlet of the seat mounting bracket.

6. The cab air conditioning system with auxiliary heating according to claim 4, characterized in that: The air outlet on the floor of the cab is equipped with a front baffle with a grille to isolate the air outlet duct from the driver.

7. The cab air conditioning system with auxiliary heating according to claim 4, characterized in that: A mounting plate is provided on the bottom surface of the cab floor. A heater mounting bracket and a bracket sealing plate are assembled on the mounting plate. The fuel heater is located in a storage cavity formed by the heater mounting bracket and the bracket sealing plate. The fuel heater can be inspected by disassembling the heater mounting bracket and / or the bracket sealing plate.

8. The cab air conditioning system with auxiliary heating according to claim 1, characterized in that: The air conditioning unit is equipped with an air outlet duct that connects to the front air vent in the cab interior to blow hot air out of the front of the cab for heating. The air conditioning unit is equipped with an air outlet duct that connects to the rear air vent in the cab interior to blow hot air out of the rear of the cab for heating. The indoor unit of the air conditioner is equipped with an air inlet for internal circulation and an air inlet for external circulation.

9. An engineering machinery, characterized in that: Includes the cab air conditioning system with auxiliary heating as described in any one of claims 1 to 8.

10. A method for controlling the temperature in a driver's cab, characterized in that: An air conditioning unit equipped with a heating core is installed in the cab, and the heating core is heated by circulating engine coolant. An auxiliary heating device consisting of a fuel heater and a heater oil pump is installed in the cab. The heater oil pump is connected between the fuel tank and the fuel heater via an oil pipe. The operator turns on the "automatic heating" mode and sets the target temperature value on the control panel. First, the engine coolant temperature is detected by the heater core temperature sensor. If the engine coolant temperature is not higher than the minimum power outlet temperature of the auxiliary heating device, the auxiliary heating device will work independently and turn on its maximum heating power. If the engine coolant temperature is higher than the minimum power outlet temperature of the auxiliary heating device, the outdoor temperature sensor will then detect the outdoor temperature. If the outdoor temperature is lower than the minimum applicable temperature of the indoor air conditioner, the indoor air conditioner and the auxiliary heating device will work simultaneously and both will be turned on at their maximum heating power. If the outdoor temperature is not lower than the minimum applicable temperature of the indoor air conditioner, the indoor air conditioner will work alone and will be turned on at its maximum heating power. When the indoor temperature sensor detects that the indoor temperature has reached the set value, if only the auxiliary heating device is working, the power of the heater oil pump will be reduced and adjusted first, and then the power of the fuel heater will be reduced and adjusted to maintain the indoor temperature at the set value. If the indoor unit of the air conditioner and the auxiliary heating device are working simultaneously, the power of the heater oil pump will be reduced and adjusted first, then the power of the fuel heater will be reduced and adjusted, and finally the power of the indoor unit of the air conditioner will be adjusted to maintain the indoor temperature at the set value. If only the indoor unit of the air conditioner is working, the power of the indoor unit of the air conditioner will be reduced and adjusted to maintain the indoor temperature at the set value.

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