Electric mine truck and low-temperature heating system thereof

Abstract

The utility model discloses an electric mine truck and a low-temperature heating system thereof, which are characterized in that a vehicle heating system water heating loop is formed by sequentially connecting a water heating PTC (Positive Temperature Coefficient), a diesel oil liquid heater, a first water pump and a proportional three-way valve in series and then respectively connecting with a heating core and a heat exchanger of an air conditioning system HVAC in a cab in parallel; three valves of the proportional three-way valve are respectively connected with a warm core of a cab internal air conditioning system HVAC, the first water pump and the heat exchanger; the heat exchanger is sequentially connected with the power battery and the second water pump to form a loop; and the water heating PTC and / or the diesel oil liquid heater are / is used for heating the power battery and / or the cab internal air conditioning system HVAC. The electric mine truck is provided with two heat sources, namely the diesel liquid heater and the water heating PTC, the diesel liquid heater is used as a main heat source, and heat is transferred to a cab and a power battery through heated cooling liquid, so that the heating performance at low temperature is improved, and the power consumption of the electric mine truck is reduced.

Description

Technical Field

[0001] This utility model relates to the field of thermal management technology for mining trucks, specifically, to an electric mining truck and its low-temperature heating system. Background Technology

[0002] With the rapid development of electric mining trucks, their penetration rate is increasing, and the range of electric mining trucks has attracted widespread attention, especially in winter temperatures in Inner Mongolia and Xinjiang, where the battery range of electric mining trucks is significantly reduced.

[0003] In related technologies, when electric mining trucks enter low-temperature environments, water-heated PTC systems heat the batteries through the coolant circulation system, effectively maintaining the vehicle's batteries within their optimal operating temperature range. However, current electric mining trucks rely on water-heated PTC systems to heat the vehicle's batteries, which is time-consuming, inefficient, and consumes a significant amount of electricity, inevitably impacting the vehicle's range. Utility Model Content

[0004] To address the aforementioned technical problems, the present invention aims to provide an electric mining vehicle and its low-temperature heating system, which uses two heat sources—a diesel liquid heater and a water-cooled PTC heater—to heat the power battery or cab, prioritizing the use of the diesel liquid heater to provide heat to the vehicle, thereby reducing overall vehicle energy consumption and rapidly improving the efficiency of overall vehicle thermal management.

[0005] The present invention solves the above problems through the following technical solution:

[0006] A low-temperature heating system for an electric mining truck includes: a water heating circuit consisting of a water-cooled PTC, a diesel liquid heater, a first water pump, and a proportional three-way valve connected in series and then connected in parallel to the heating element and heat exchanger of the HVAC system inside the cab; the three valves of the proportional three-way valve are respectively connected to the heating element, the first water pump, and the heat exchanger of the HVAC system inside the cab; the heat exchanger is connected in series with the power battery and the second water pump to form a circuit; the system heats the power battery and / or the HVAC system inside the cab through the water-cooled PTC and / or the diesel liquid heater.

[0007] As a further improvement of this utility model, the proportional three-way valve is also connected to the first expansion tank via a pipeline.

[0008] As a further improvement of this utility model, the heat exchanger and the second water pump are also connected to a second expansion tank through a pipeline.

[0009] As a further improvement of this utility model, the first expansion tank and / or the second expansion tank are provided with a liquid level switch.

[0010] As a further improvement of this utility model, the HVAC system inside the driver's cab is also equipped with a blower, which is located next to the heating element and is used to dissipate heat from the heating element.

[0011] As a further improvement of this utility model, the water heating PTC, proportional three-way valve, power battery, diesel liquid heater and driver's cab air conditioning panel of the vehicle heating system water heating circuit are respectively connected to the vehicle control system through the vehicle CAN network so as to be controlled by the vehicle control system.

[0012] Furthermore, this utility model also solves the above problems through the following technical solutions:

[0013] An electric mining vehicle is equipped with a low-temperature heating system as described above.

[0014] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0015] (1) This utility model has two heat sources: a diesel liquid heater and a water heating PTC. The diesel liquid heater is the main heat source. The heat is transferred to the cockpit and power battery through the heated coolant, thereby improving the heating performance at low temperatures and reducing the power consumption of pure electric vehicles.

[0016] (2) This utility model uses the vehicle control system to intelligently control the opening of the proportional three-way valve, ensuring that the heat resources generated by the circulating water can be reasonably distributed, effectively improving the accuracy of heat energy distribution and improving the efficiency of heat energy distribution. Attached Figure Description

[0017] Figure 1 This is a connection diagram of a low-temperature heating system for an electric mining vehicle according to the present invention;

[0018] Figure 2 This is a schematic diagram illustrating the specific working principle of the water heating circuit of the vehicle heating system of this utility model;

[0019] Figure 3 This is a schematic diagram illustrating the information interaction between the water heating circuit of the vehicle heating system and the vehicle control system of this utility model.

[0020] Attached reference numerals: 1. PTC water heater; 2. Diesel liquid heater; 3. First water pump; 4. Proportional three-way valve; 5. HVAC system inside the cab; 51. Heater core; 52. Blower; 6. Heat exchanger; 7. Power battery; 8. Second water pump; 9. First expansion tank; 10. Second expansion tank. Detailed Implementation

[0021] 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.

[0022] Example:

[0023] See attached document Figure 1 A low-temperature heating system for an electric mining truck includes: a water heating circuit consisting of a water heating PTC 1, a diesel liquid heater 2, a first water pump 3, and a proportional three-way valve 4 connected in series and then connected in parallel to the heating core 51 and heat exchanger 6 of the HVAC system 5 inside the cab; the three valves of the proportional three-way valve 4 are respectively connected to the heating core 51, the first water pump 3, and the heat exchanger 6 of the HVAC system 5 inside the cab; the heat exchanger 6 is also connected in series with a power battery 7 and a second water pump 8 to form a circuit; so as to heat the power battery and / or the HVAC system inside the cab through the water heating PTC and / or the diesel liquid heater.

[0024] Preferably, the proportional three-way valve 4 is also connected to the first expansion tank 9 via a pipeline to the first water pump 3; the heat exchanger 6 is also connected to the second expansion tank 10 via a pipeline to the second water pump 8.

[0025] Optionally, the first expansion tank and / or the second expansion tank are equipped with level switches.

[0026] Optionally, in this embodiment, the driver's cab air conditioning system (HVAC) includes a heater core 51 and a blower 52, with the blower located next to the heater core for dissipating heat from the heater core.

[0027] In one specific embodiment, such as Figure 1 As shown, this invention integrates a diesel liquid heater into the existing water circulation loop as the primary heat source for heating the circulating water. The diesel liquid heater uses diesel fuel and transfers heat to the passenger compartment and battery through the heated coolant, thereby improving heating performance at low temperatures and reducing the energy consumption of the pure electric vehicle. As a new heat source integrated into the vehicle's heating circuit, the diesel liquid heater adds another heat source. By linking the diesel liquid heater and the water-cooled PTC (Power Transmission Control Unit) through the vehicle control system, heating needs in different scenarios can be met, minimizing the use of the water-cooled PTC and ultimately improving the range of the pure electric vehicle in low-temperature conditions.

[0028] like Figure 3As shown, a low-temperature heating system for an electric mining truck includes a water heating PTC, a proportional three-way valve, a power battery, a diesel liquid heater, and a cab air conditioning panel in the vehicle heating system's water heating circuit, all connected to the vehicle control system via the vehicle's CAN network for separate control.

[0029] like Figure 2 The diagram illustrates the specific working principle of the water heating circuit in a vehicle's heating system.

[0030] Step S100: The vehicle control system determines whether the power battery requires heating.

[0031] In a specific embodiment of this utility model, the vehicle control system determines whether the vehicle needs heating based on the current power battery temperature.

[0032] Step S200: The target water temperature is T2. Determine if the current water temperature t ≤ the low temperature threshold T1.

[0033] T1 is the low temperature threshold. If the current water temperature t is lower than this low temperature threshold T1, the vehicle control system will simultaneously turn on the diesel liquid heater and water heater PTC to achieve rapid heating.

[0034] If the current water temperature t is higher than the low temperature threshold T1, proceed to step S400.

[0035] Step S300: If the low temperature threshold T1 < current water temperature t < target water temperature T2, turn off the water heating PTC and only keep the diesel liquid heater working.

[0036] Step S400: Determine if the diesel liquid heater is working properly.

[0037] When the current water temperature t is higher than the low temperature threshold T1, only the diesel liquid heater will be turned on. If the diesel liquid heater malfunctions due to faults or other reasons, the vehicle control system will automatically turn on the water heater PTC to ensure normal heating.

[0038] Step S500: If the current water temperature t ≥ the target water temperature T2, then the target water temperature T2 is reached, the vehicle control system will shut down the heating system, and the process ends.

[0039] In summary, when heating is required, the diesel liquid heater is prioritized as the heat source. When the heater capacity is insufficient or fuel is low, the water-cooled PTC heater is activated simultaneously to meet the vehicle's heating needs. The heating system aims to minimize the use of the water-cooled PTC heater to conserve battery power and extend the electric mining truck's range. Figure 2 The diagram shown only illustrates the process of heating the power battery. The principle of heating the cockpit is the same, so it will not be described again here.

[0040] When both the power battery and the cabin require heating, the vehicle control system acquires the target temperature and the current temperature. Based on the difference between the target temperature and the current temperature, it generates valve control commands to adjust the water flow into the cabin and heat exchanger via a proportional three-way valve. The vehicle control system generates valve control commands based on the heating priority of the cabin temperature and battery temperature, as well as specific demand information, to ensure that the heat resources generated by the circulating water can be rationally allocated, effectively improving the accuracy and efficiency of heat energy distribution.

[0041] like Figure 3 The diagram illustrates the information interaction of the vehicle heating system. Based on the specific conditions of the vehicle, the vehicle control system interacts with the cab air conditioning panel and the power battery, controlling the start or stop of the diesel liquid heater and water-cooled PTC via the vehicle's CAN bus. When both the power battery and the cab require heating, the vehicle control system acquires the target temperature and the current temperature. Based on the difference between the target temperature and the current temperature, it generates valve control commands, adjusting the water flow into the cab and heat exchanger via a proportional three-way valve. The vehicle control system generates valve control commands based on the heating priority of the cab temperature and battery temperature, as well as specific demand information, ensuring that the heat resources generated by the circulating water are rationally allocated, effectively improving the accuracy and efficiency of heat energy distribution.

[0042] This utility model also discloses an electric mining vehicle equipped with the aforementioned low-temperature heating system. The low-temperature heating system features two heat sources: a diesel liquid heater and a water-cooled PTC heater. In low-temperature environments below a certain threshold, the vehicle heating system can simultaneously activate both the diesel liquid heater and the water-cooled PTC heater to heat the circulating water pipes, achieving rapid heat provision. In low-temperature environments above a certain threshold, the vehicle heating system prioritizes activating the diesel liquid heater to provide heat to the vehicle. When the diesel liquid heater fails, the vehicle control system will directly activate the water-cooled PTC heater as a backup to provide the necessary heat. During the heating process, the vehicle control system can select the most suitable heating method based on the actual ambient temperature and the state of the power battery, reducing reliance on the power battery during vehicle heating. Through effective management of different heat sources and intelligent heat distribution, the system reduces overall vehicle energy consumption, improves the efficiency of overall vehicle thermal management, and effectively enhances the vehicle's range.

[0043] Although the present invention has been described herein with reference to illustrative embodiments, the above embodiments are merely preferred embodiments of the present invention, and the implementation of the present invention is not limited to the above embodiments. It should be understood that those skilled in the art can design many other modifications and implementations, which will fall within the scope and spirit of the principles disclosed in this application.

Claims

1. An electric mine truck low temperature heating system, characterized by, The vehicle heating system water heating circuit comprises a water heating PTC, a diesel liquid heater, a first water pump and a proportional three-way valve connected in series, and the water heating PTC and the diesel liquid heater are connected with a heating core and a heat exchanger of an internal cab air conditioning system HVAC in parallel, respectively; the three valves of the proportional three-way valve are connected with the heating core, the first water pump and the heat exchanger of the internal cab air conditioning system HVAC, respectively; the heat exchanger is connected with a power battery and a second water pump in series to form a circuit; the water heating PTC and / or the diesel liquid heater are used to heat the power battery and / or the internal cab air conditioning system HVAC. A first expansion water tank is connected between the proportional three-way valve and the first water pump through a pipeline.

2. The low temperature heating system for an electric mine truck of claim 1, wherein, A second expansion water tank is connected between the heat exchanger and the second water pump through a pipeline.

3. The low temperature heating system for an electric mine truck of claim 2, wherein, The first expansion water tank and / or the second expansion water tank is provided with a liquid level switch.

4. The low temperature heating system for an electric mine truck of claim 3, wherein, The internal cab air conditioning system HVAC is further provided with a blower arranged beside the heating core for heat dissipation of the heating core.

5. The low temperature heating system for an electric mine truck of claim 1, wherein, The water heating PTC, the proportional three-way valve, the power battery, the diesel liquid heater and the cab air conditioning panel of the internal cab air conditioning system HVAC of the vehicle heating system water heating circuit are connected with a vehicle control system through a vehicle CAN network, respectively, so as to be controlled by the vehicle control system.

6. The low temperature heating system for electric mine vehicle according to any one of claims 1-5, characterized in that, The low-temperature heating system of the electric mine vehicle is provided with the heating system according to any one of claims 1-6.

7. An electric mine truck, characterized in that ​

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