A light-duty pure electric refrigerated vehicle and refrigeration control method thereof

Abstract

The present invention provides a lightweight, all-electric refrigerated vehicle and its refrigeration control method, comprising: a controller, an operating panel unit, an evaporator unit, a compressor unit, and a condenser unit, each of which is connected to an electronic control unit. The evaporator unit is located at the front top of the insulated compartment, and the operating panel unit is embedded in the middle of the central instrument panel. The controller, compressor unit, condenser unit, and electronic control unit are located at the bottom of the vehicle and interconnected via pipelines. The present invention eliminates the roof-mounted condenser mechanism commonly found in refrigerated vehicles, maintaining the original vehicle's streamlined appearance and ensuring minimal wind resistance during driving. The vehicle's height is not increased to meet height restrictions in urban areas, thus ensuring the vehicle's passability.

Description

Technical Field

[0001] The present invention relates to the field of refrigerated trucks, and in particular to a light-duty pure electric refrigerated truck and a refrigeration control method thereof. Background Art

[0002] With the improvement of domestic living standards, people's food variety and nutritional content are becoming increasingly rich. The refrigerated truck market for food cold chain transportation has entered a period of steady growth in recent years. In 2019, the number of refrigerated trucks in my country exceeded 210,000, among which light refrigerated trucks, which are the main force of urban cold chain distribution, ranked first in sales. As cold chain logistics shows an increasing trend of order fragmentation and the demand for terminal urban delivery increases, there is also a corresponding demand in industries such as medical vaccines. The light refrigerated truck market is growing rapidly, but currently light refrigerated trucks still have the following problems:

[0003] In urban cold chain distribution, faced with complex road conditions, garages, supermarkets, hospitals, etc. all have height restrictions. Since common refrigerated trucks of the same type all place the refrigeration unit external unit on the roof or the front of the box, on the one hand, it affects the passability of the entire vehicle, and on the other hand, it increases the wind resistance of the vehicle, which cannot meet the passability requirements of specific places. Summary of the Invention

[0004] The object of the present invention is to provide a light-duty pure electric refrigerated vehicle and a refrigeration control method thereof to solve the above-mentioned problems.

[0005] To achieve the above-mentioned objectives, an embodiment of the present invention provides a light-duty pure electric refrigerated vehicle, comprising a controller, an operation panel unit, an evaporator unit, a compressor unit, and a condenser unit, which are respectively connected to the unit electronic control unit. The evaporator unit is arranged at the front top of the refrigerated box body, and the operation panel unit is embedded in the middle of the central control instrument panel. The controller, compressor unit, condenser unit and unit electronic control unit are separately placed at the bottom of the vehicle and are interconnected through pipelines.

[0006] Furthermore, the compressor unit is arranged between the power battery and the cabin, the controller and the unit electronic control unit are arranged in the cabin below the cab, and the condenser unit is arranged between the radiator module and the front guard. The various components are connected by pipelines to form a closed refrigeration system.

[0007] It further includes a fast charging socket and a slow charging socket, which are arranged on the outside of the refrigeration box. The fast charging socket is connected to the controller through the power battery, and the slow charging socket is connected to the controller.

[0008] Furthermore, it also includes a remote communication monitoring module and a power supply module, wherein the remote communication monitoring module and the power supply module are used to communicate with the remote operation device, and the remote communication monitoring module and the power supply module are electrically connected to the power battery.

[0009] Furthermore, it also includes multiple temperature sensors, which are connected to the unit's electronic control unit. The multiple temperature sensors are respectively arranged in the evaporator unit and the condenser unit to collect their temperatures to adjust the parameters of the compressor unit and the condenser unit.

[0010] Furthermore, it also includes a refrigeration unit pre-charge component, a main control component and a fuse component, and the refrigeration unit pre-charge component, the main control component and the fuse component are respectively connected to the power battery.

[0011] Furthermore, the condenser unit includes a condenser core, a cooling fan and a liquid reservoir, wherein the cooling fan is a dual-speed mode.

[0012] Furthermore, the controller is a three-in-one controller, which includes PDU, OBC and DCDC.

[0013] Furthermore, it also includes a defrost solenoid valve, which is arranged on the evaporator unit and connected to the condenser unit.

[0014] The present invention also provides a refrigeration control method for a light-duty pure electric refrigerated vehicle. When the vehicle ignition key is in the OFF position or the key is not inserted and in the N position, the remote communication monitoring module and the power supply module obtain a wake-up instruction of the currently connected remote control device; wherein the remote communication monitoring module and the power supply module have at least one or more CAN communication channels, two or more power supply control channels, and a 12V power output;

[0015] The remote communication monitoring module and the power supply module perform the wake-up operation through the 12V power output. One of them is to provide high-voltage DC power to the controller and the unit's electronic control unit through the wake-up power battery, and to provide low-voltage power to the evaporator unit and condenser unit fans. The other one wakes up the unit's electronic control unit.

[0016] The cabin temperature is set on the control panel unit, and the unit's electronic control unit controls the evaporator unit, condenser unit, compressor unit, and defrost solenoid valve to open or close for operation;

[0017] By collecting the return air temperature value of the evaporator unit in the vehicle compartment and comparing it with the preset temperature, the difference is obtained, and the unit's electronic control unit adjusts the compressor unit speed according to the difference.

[0018] Beneficial technical effects of the present invention:

[0019] The present invention provides a light-duty pure electric refrigerated vehicle and a refrigeration control method thereof, comprising: a controller, an operation panel unit, an evaporator unit, a compressor unit, and a condenser unit, which are respectively connected to an electric control unit of the unit. The evaporator unit is arranged at the front top of the insulation compartment, and the operation panel unit is embedded in the middle of the central control instrument panel. By placing the controller, compressor unit, condenser unit and electric control unit of the unit at the bottom of the vehicle and interconnecting them through pipelines, the roof condenser mechanism commonly seen in refrigerated vehicle models is eliminated, the streamlined appearance of the original vehicle is maintained, and smaller wind resistance during driving is ensured. The height of the entire vehicle does not need to be increased to meet the height limit requirements of urban places, thereby ensuring the passage of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of a light-duty pure electric refrigerated truck provided in the first embodiment of the present invention.

[0022] Figure 2 A schematic diagram of another light-duty pure electric refrigerated vehicle provided in the first embodiment of the present invention.

[0023] Figure 3 This is a working diagram of the refrigeration unit system provided by the first embodiment of the present invention.

[0024] Figure 4 This is a schematic diagram of the high and low voltage power supply principles of a refrigeration unit provided in the first embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the low-pressure wake-up principle of a refrigeration unit provided by the first embodiment of the present invention.

[0026] Figure 6 The figure is a flow chart of a refrigeration control method for a light-duty pure electric refrigerated vehicle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention for which protection is claimed, but merely represents selected embodiments of the present invention.

[0028] To facilitate understanding of the present invention, this embodiment uses a Hiace type vehicle.

[0029] The first embodiment of the present invention provides a light-duty pure electric refrigerated vehicle, referring to Figure 1-2 , including: a controller 1, an operation panel unit 2, an evaporator unit 3, a compressor unit 4, and a condenser unit 5, which are respectively connected to the unit electronic control unit 6. The evaporator unit 3 is suitable for being arranged at the front top of the refrigerated box body, and the operation panel unit 2 is embedded in the middle of the central control instrument panel. The controller 1, compressor unit 4, condenser unit 5 and unit electronic control unit 6 are separately placed at the bottom of the vehicle and are interconnected through pipelines.

[0030] In this embodiment, the compressor unit 4 is arranged between the power battery 7 and the cabin, the controller 1 and the unit electronic control unit 6 are arranged in the cabin below the cab, and the condenser unit 5 is arranged between the radiator module and the front guard. The various components are connected by pipelines to form a closed refrigeration system.

[0031] In this embodiment, the compressor unit 4 includes a compressor, a gas-liquid separator, an oil separator, and a crankshaft regulating valve. The refrigerant passes through these gas-liquid separators, the crankshaft regulating valve, the compressor, and the oil separator before being delivered to the condenser unit 5. The compression process is as follows: the low-temperature, low-pressure refrigerant on the low-pressure side of the evaporator unit 3 undergoes gas-liquid separation and pressure stabilization by the crankcase pressure regulating valve, whereupon it is compressed into a high-temperature (70°C to 90°C), high-pressure (1.9 to 2.2 MPa) gaseous refrigerant. The refrigerant is then delivered to the condenser through the oil separator for cooling.

[0032] In this embodiment, the condenser unit 5 includes a condenser, a cooling fan, and a liquid reservoir, wherein the cooling fan can select a dual-speed mode. The condensation process is specifically as follows: when the temperature of the superheated gaseous refrigerant sent to the condenser is much higher than the external temperature, it dissipates heat outward for heat exchange, and the refrigerant is condensed into a liquid refrigerant with a medium temperature and a pressure of 1.7Mpa to 2.1Mpa. The condensed liquid refrigerant passes through the expansion valve, which increases the volume of the space through which the refrigerant flows, and its pressure and temperature drop sharply, turning it into a low-temperature, low-pressure (0.1 to 0.2MPa) wet steam so that it can enter the evaporator unit 3 and quickly absorb heat and evaporate. During the expansion process, flow control is performed simultaneously to supply the refrigerant required by the evaporator unit 3, thereby achieving the purpose of temperature control.

[0033] In this embodiment, the evaporation process is as follows: Liquid refrigerant passes through the expansion valve and becomes low-temperature, low-pressure wet vapor. It then flows through the evaporator, continuously absorbing heat and vaporizing into a low-temperature, low-pressure (0.12-0.2 MPa) gaseous refrigerant, which absorbs heat from the air in the refrigerated compartment. The gaseous refrigerant flowing out of the evaporator unit 3 is then drawn into the compressor, pressurized, and pumped into the condenser for condensation, thus completing the refrigeration cycle.

[0034] This embodiment also includes a defrost solenoid valve, which is located next to the evaporator unit 3 and connected to the compressor unit 4. The defrost process is as follows: the unit's electronic control unit 6 automatically turns off the cooling fan of the evaporator unit 3. After 3 seconds, the defrost solenoid valve opens, pumping high-temperature, high-pressure gaseous refrigerant into the hot gas defrost coil, thereby melting the frost on the evaporator fins. The refrigerant then undergoes gas-liquid separation, reduces the operating pressure through the crankcase pressure regulating valve, and flows back to the compressor.

[0035] In this embodiment, the controller 1 may be a three-in-one controller, which includes a PDU, an OBC, and a DCDC. Of course, it should be noted that the controller 1 may also be other models, and these solutions are all within the protection scope of the present invention.

[0036] In this embodiment, a plurality of temperature sensors are also included, which are connected to the electronic control unit 6 of the unit. The plurality of temperature sensors are respectively arranged in the evaporator unit 3 and the condenser unit 5 to collect their temperatures so as to adjust the parameters of the compressor unit 3 and the condenser unit 5. The specific process is as follows: the temperature of the return air outlet of the evaporator unit 3, the temperature of the core fins of the evaporator unit 3, and the temperature of the air outlet of the condenser unit 5 are collected by the temperature sensors, and the values ​​are used as the state values ​​during the operation of the unit to adaptively adjust the operating speed of the compressor in the compression unit 4, the operating speed of the cooling fan in the condenser unit 5, and whether to enter the defrost mode; thus, the refrigeration unit is ensured to have strong and efficient refrigeration capabilities, while at the same time making the temperature fluctuation in the refrigerated compartment very small and having good constant temperature characteristics; in addition, the current shock generated during frequent start-stop is avoided, thus reducing the energy consumption of the system and increasing the service life of the system.

[0037] To facilitate understanding of the present invention, the following details the operating principle and process of the refrigeration unit when the power battery 7 provides energy. Figure 3-5 , put the vehicle ignition key in the ON / READY position, start the refrigeration unit according to the user's operation, reduce the temperature in the refrigerated compartment to the set temperature T and maintain it at T±2℃. This mode is mainly to meet the need to ensure the storage temperature of products in the refrigerated compartment during driving or parking. The steps are as follows:

[0038] When the key is in the ON / READY position, the 12V+ power supply enters the ignition lock AM1 pin and exits the IG1 pin. One path enters the normally closed contact 87a pin of the auxiliary source relay and exits the 30 pin, passing through the diode S7, thereby waking up the refrigeration unit and closing the K8 relay in the unit's electronic control unit 6. Another path wakes up the power battery 7 through the diode S5. The power battery 7 includes the BMS system. The BMS system starts self-checking and has no faults. When the SOC is ≥5%, there is no power-off request and no level 1 fault in the vehicle, the BMS system controls the main negative contactor K2 in the power battery 7 to close, thereby providing 360V high-voltage DC power to the unit's electronic control unit 6 and controller 1 (including DCDC). The BMS system wakes up the DCDC through the vehicle's CAN message, thereby starting the evaporator unit 3 and condenser unit 5 and monitoring the working status of the DCDC.

[0039] Then press the power button of the control panel unit 2 and set the cabin temperature Tset. The unit electronic control unit 6 first closes the unit pre-charge relay K7 and detects the compressor voltage. When the voltage is ≥250V and the time reaches 10S, the unit main contactor K6 is energized and the pre-charge relay K7 is disconnected. After 3 seconds, the unit electronic control unit 6 closes relays K9 and K10, triggering the fan and defrost solenoid valve of the evaporator unit 3 to work. After 10 seconds, the unit electronic control unit 6 closes relay K11, and the cooling fan of the condenser unit 5 starts to work at low speed. At the same time, it controls the disconnection of relay K10 and the closing of the defrost solenoid valve. After another 3 seconds, the unit electronic control unit 6 sends a CAN message to wake up the compressor to start working.

[0040] The compressor unit 4 is in variable frequency mode during cooling operation. Specifically, the unit electronic control unit 6 collects the return air temperature value T of the evaporator unit 3 in the vehicle compartment. 厢 , and the preset temperature T set For comparison, T 厢 -T set It is recorded as ΔT. The unit electronic control unit 6 adjusts the speed of the compressor unit 4 according to ΔT. For details, see Table 1.

[0041] Table 1

[0042]

[0043] In this embodiment, in order to take into account both heat dissipation effect and energy saving, the fan of the compressor unit 4 selects the dual-speed mode, and the unit electronic control unit 6 collects the air outlet side temperature T of the condenser core. 冷 , in T 冷 When the temperature is ≥52℃, the unit electronic control unit 6 closes relay K12, and the cooling fan enters high-speed working mode. 冷 When the temperature is ≤48°C, the cooling fan of the condenser unit 5 re-enters the low-speed operation mode.

[0044] In order to meet the actual needs of customers, manual and automatic defrost modes are set, and the preset defrost allowable temperature is T 霜1 , the defrost termination temperature is T 霜2 , the defrost working time is preset to t 霜1 , defrost interval time t 霜2 The unit's electronic control unit 6 determines whether to enter the defrost mode based on the defrost temperature sensor value, manual defrost command, automatic defrost interval and other comprehensive information; if the measured defrost point temperature of the heat release fin in the evaporator unit 3 is ≤T 霜1 , and the unit electronic control unit 6 receives a manual defrost command or a defrost interval time t 霜2When the defrost point is reached, the defrost solenoid valve K11 is started and the defrost interval time is reset. After 5 seconds, the compressor of the compressor unit 4 is started, the fan of the evaporator unit 3 and the cooling fan of the condenser unit 5 are turned off, and the core and low-pressure pipeline of the evaporator unit 3 are defrosted. If the measured temperature of the defrost point is ≥T 霜2 Or the defrost working time reaches t 霜1 , the compressor and defrost solenoid valve are turned off, and the defrost interval time starts again after 30 seconds, and the unit returns to the state before defrosting.

[0045] The present embodiment provides a light-duty pure electric refrigerated truck. By placing the controller 1, compressor unit 4, condenser unit 5 and unit electronic control unit 6 at the bottom of the vehicle and interconnecting them through pipelines, the roof condenser mechanism commonly found in refrigerated trucks is eliminated, the streamlined appearance of the original vehicle is maintained to ensure less wind resistance during driving, and the height of the entire vehicle is not increased to meet the height restrictions in urban areas, thus ensuring the passage of the vehicle. The refrigeration unit system of the refrigerated truck has been redesigned with several modules for the bottom space of the Sea Lion type vehicle. According to the rationality of assembly and maintenance, the modules are separately arranged at the front, middle and rear of the chassis, as well as in the compartment. This embodiment takes into account changes in ambient temperature. By selecting a dual-speed mode for the fan of the compressor unit 4, both heat dissipation and energy saving can be taken into account. Manual and automatic defrosting modes are also provided to meet different needs.

[0046] Preferably, it also includes a fast charging socket 8 and a slow charging socket 9, which are arranged on the outside of the insulation compartment. The fast charging socket 8 is connected to the controller 1 through the power battery 7, and the slow charging socket 9 is connected to the controller 1.

[0047] In this embodiment, the refrigeration unit operation modes in fast and slow charging states when the vehicle is parked include: a controller 1, an operation panel unit 2, an evaporator unit 3, a compressor unit 4, a condenser unit 5, a unit electronic control unit 6, a power battery 7, a fast charging socket 8 and a slow charging socket 9.

[0048] To facilitate understanding of the present invention, the operating principle of the refrigeration unit in the fast and slow charging states when the vehicle is parked is described in detail: when the vehicle ignition key is in the OFF position or the key is not inserted, the power battery 7 is charged through the vehicle's fast charging socket 8 and slow charging socket 9, and at the same time, the refrigeration unit can be started according to customer needs to reduce the temperature inside the refrigerated compartment to the set temperature T and maintain it at T±2°C. This mode is mainly to meet the needs of pre-cooling the refrigerated compartment before loading or ensuring the preservation temperature of products in the refrigerated compartment during parking without consuming the energy of the power battery 7. To describe the control method of the refrigeration unit operation mode in the fast and slow charging states of the vehicle, the following steps are included:

[0049] When the fast charging socket 8 and slow charging socket 9 of the vehicle are plugged into the fast charging or slow charging gun, the fast charging socket 8 or the controller 1 sends out a 12V+ wake-up power supply, which passes through the diode S1 or S2, and controls the auxiliary source relay to close 87b and 30 pins, so that the 12V+ power passes through the diode S7, wakes up the unit electronic control unit 6, and closes the K8 relay in the unit electronic control unit 6; the other way is through the diode S3, wakes up the control device in the power battery 7, and the power battery 7 includes a BMS, and then controls it in combination with the charging CAN information. If it is in the fast charging state, :BMS closes the fast charging relay K1 inside the power battery 7. If it is in the slow charging state: BMS sends the on-board charger enable signal to start the on-board charger to provide 360V high-voltage power to the unit's electronic control unit 6 and controller 1. Except for the SOC fully charged state, the BMS will close the main negative relay K2 inside the power battery 7. The BMS control device wakes up the DCDC start-up work through the vehicle CAN message to provide 13.5V low-voltage electricity to the fans of the evaporator unit 3 and the condenser unit 5, and monitors the DCDC working state. BMS makes corresponding adjustments based on the power level of the power battery 7 and the operating status of the refrigeration unit; first, the normal charging process is performed when charging alone, and then when the refrigeration unit is running alone, the BMS disconnects the main negative relay K2, and the BMS charging request current is i 制冷机组 Finally, the refrigeration unit is running while charging, and the BMS closes the main negative relay K2, and the BMS requests the charging parameter current to be i 电池 +i 制冷机组 .

[0050] Currently, new energy vehicle charging times are relatively long, with fast charging typically taking 1.5 to 2 hours and slow charging typically taking around 10 hours. It's common for refrigeration units to malfunction while charging, resulting in the refrigerated compartment being unable to maintain temperature during the charging process, impacting the vehicle's operational efficiency. Existing refrigerated truck backup power systems rely on external mains power for refrigeration when the vehicle is stopped or malfunctions. A common solution in the market involves independently adding a 220V / 380V interface and power supply system. This approach proposes adding an additional dual-mode inverter and a 220V AC charging interface to power the refrigeration unit, increasing vehicle cost and failing to meet the refrigeration unit's operational requirements during fast charging. This embodiment utilizes the power battery 7, energy control device, and charging equipment already included in the pure electric vehicle to enable charging from the charging station and mains power while simultaneously providing power to the refrigeration unit. This eliminates the need for a dedicated external power interface and power conversion equipment for the refrigeration unit, allowing the refrigeration unit to maintain normal operation without depleting the power battery, thereby improving the vehicle's range.

[0051] Preferably, it further includes a remote communication monitoring module and a power supply module, wherein the remote communication monitoring module and the power supply module are used to communicate with the remote operation device, and the remote communication monitoring module and the power supply module are electrically connected to the power battery 7.

[0052] In this embodiment, when the vehicle is parked, the operation mode of the refrigeration unit in the remote control state includes: controller 1, operation panel unit 2, evaporator unit 3, compressor unit 4, condenser unit 5, unit electronic control unit 6, power battery 7, fast charging socket 8 and slow charging socket 9, remote communication monitoring and power supply module.

[0053] To facilitate understanding of the present invention, the working principle of the refrigeration unit operation mode in the remote control state under the vehicle parking condition is described in detail: the vehicle ignition key is in the OFF position or the key is not inserted, and the remote control device is operated to start the remote communication monitoring and power supply module, activate the power battery 7 and the unit electronic control unit 6, wherein the power battery 7 contains a BMS, and the remote communication monitoring and power supply module obtains the vehicle power battery 7, gear position, and refrigeration unit operation parameter information through CAN messages. This mode can meet the needs of users who want to remotely control the operation of the vehicle refrigeration unit system when they are not next to the vehicle or taking a rest, and can maximize the vehicle operation efficiency and time. To describe the control method of the refrigeration unit operation mode in the remote control state under the vehicle parking condition, the following steps are included:

[0054] When the vehicle ignition key is in the OFF position or the key is not inserted and in the N position, the remote control device is operated through a mobile phone or computer and connected to the remote communication and power supply module. The remote communication and power supply module hardware has at least one CAN communication channel, two or more power supply control channels, 12V power output, safety and overload protection control, etc. The remote communication and power supply module wakes up the unit electronic control unit 6 through the 12V+ wake-up power supply, one way through the diode S6, so that the K8 relay in the unit electronic control unit 6 is closed; the other way through the diode S4, wakes up the control device of the power battery 7, The BMS uses charging CAN information for control. If the fast-charging socket 8 is plugged in, the BMS closes the fast-charging relay K1 inside the power battery 7. If the slow-charging socket 9 is plugged in, the BMS sends an onboard charger enable signal to start the onboard charger. If no plug-in information is received, the BMS closes the main negative relay inside the power battery 7 to provide 360V high-voltage power to the unit's electronic control unit 6 and controller 1. The BMS controller uses the vehicle's CAN message to activate the DC-DC converter (DCC) to provide 13.5V low-voltage power to the fans of the evaporator unit 3 and condenser unit 5, and monitors the DC-DC converter's operating status. The remote communication and power supply module reports real-time parameters of the power battery 7 and the refrigeration unit before and during refrigeration unit operation, and can also manually shut down the refrigeration system.

[0055] The existing pure electric refrigeration truck refrigeration system solution does not address the situation where the user wants to operate the vehicle refrigeration system when the user is not near the vehicle or resting. It is proposed to add a remote monitoring device, which can only view the status information of the refrigerated truck during operation, and has no remote control of the refrigeration unit on and off. Refrigerated truck users value timeliness, and improving operating time can reduce costs and increase profits. This embodiment starts the refrigeration unit through the remote operation device and interconnects the vehicle-mounted remote communication and power module to monitor the operating parameters of the refrigeration unit and power battery 7. This control method can well address the situation where the user wants to operate the vehicle refrigeration system when the user is not near the vehicle or resting, thereby improving the vehicle's operating efficiency as much as possible and providing a basis for background monitoring of cold chain transportation.

[0056] Preferably, the system further comprises a refrigeration unit pre-charge component, a main control component, and a fuse component, wherein the refrigeration unit pre-charge component, the main control component, and the fuse component are respectively connected to the power battery, so as to meet the refrigeration unit operation requirements in various situations such as vehicle driving, power battery 7 fast charging, and mains slow charging.

[0057] See also Figure 6 The second embodiment of the present invention further provides a refrigeration control method for a light-duty pure electric refrigerated vehicle, which includes:

[0058] S201: When the vehicle ignition key is in the OFF position or the key is not inserted and in the N position, the remote communication monitoring module and the power supply module obtain a wake-up command of the currently connected remote control device; wherein the remote communication monitoring module and the power supply module have at least one CAN communication channel, two or more power supply control channels, and a 12V power output;

[0059] S202: The remote communication monitoring module and the power supply module perform a wake-up operation through the 12V power output. One path uses the wake-up power battery to provide high-voltage DC power to the controller and the unit's electronic control unit, and low-voltage power to the evaporator unit and condenser unit fans. The other path wakes up the unit's electronic control unit.

[0060] S203, the cabin temperature is set on the control panel unit, and the unit electronic control unit controls the evaporator unit, condenser unit, compressor unit and defrost solenoid valve to open or close to operate;

[0061] S204, by collecting the return air temperature value of the evaporator unit of the unit in the vehicle, comparing it with the preset temperature, obtaining a difference, and the unit electronic control unit adjusts the compressor unit speed according to the difference.

[0062] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A light-duty pure electric refrigerated vehicle, characterized in that: include: It has a DCDC controller, an operation panel unit, an evaporator unit, a compressor unit, and a condenser unit, each of which is connected to the unit's electronic control unit. The evaporator unit is located in the front top of the refrigerated compartment, and the operation panel unit is embedded in the middle of the central control instrument panel. The compressor unit is located between the power battery and the engine compartment. The controller and the unit's electronic control unit are located in the engine compartment below the cab. The condenser unit is located between the radiator module and the front bumper. All components are connected by pipes to form a closed refrigeration system. It also includes a fast charging socket, a slow charging socket, a remote communication monitoring module, and a power module. The remote communication monitoring module can realize manual shutdown of the refrigeration unit system through a remote operation device; When the vehicle ignition key is in the OFF position or the key is not inserted and in the N position, the remote communication monitoring module and the power supply module obtain the wake-up command of the currently connected remote control device; wherein the remote communication monitoring module and the power supply module have at least one CAN communication channel, two power supply control channels, and a 12V power output; The remote communication monitoring module and the power supply module perform the wake-up operation through the 12V power output. One way wakes up the unit's electronic control unit, closing the relay in the unit; the other way wakes up the power battery control device BMS. The BMS is controlled by combining the charging CAN information. If a fast charging socket is plugged in, the BMS closes the fast charging relay inside the power battery. If a slow charging socket is plugged in, the BMS sends an on-board charger enable signal to start the on-board charger. If there is no plug-in information, the main negative relay inside the power battery is closed to provide 360V high-voltage power to the unit's electronic control unit and controller. The BMS also wakes up the DCDC startup through the vehicle CAN message to provide low-voltage power for the fans of the evaporator unit and condenser unit; When charging a single unit, the normal charging process is executed. When the single refrigeration unit is running, the BMS disconnects the main negative relay and the BMS charging request current is i 制冷机组 When the refrigeration unit is running while charging, the BMS closes the main negative relay and the BMS requests the charging parameter current to be i 电池 +i 制冷机组 ; It also includes multiple temperature sensors, which are connected to the unit's electronic control unit. The multiple temperature sensors are respectively arranged on the evaporator unit and the condenser unit to collect the temperature of the return air outlet of the evaporator unit, the temperature of the evaporator unit core fins, and the temperature of the air outlet on the air side of the condenser unit. By comparing with the preset temperature, the difference is obtained, and the unit's electronic control unit adjusts the compressor unit speed according to the difference.

2. The light-duty pure electric refrigerated vehicle according to claim 1, characterized in that: The fast charging socket and the slow charging socket are arranged on the outside of the refrigeration box body. The fast charging socket is connected to the controller through the power battery, and the slow charging socket is connected to the controller.

3. The light-duty pure electric refrigerated vehicle according to claim 2, characterized in that: The remote communication monitoring module and the power supply module are integrated into a remote communication monitoring and power supply module. The remote communication monitoring and power supply module is used to communicate with the remote operation device, and the remote communication monitoring and power supply module is electrically connected to the power battery.

4. The light-duty pure electric refrigerated vehicle according to claim 1, characterized in that: It also includes a refrigeration unit pre-charge component, a main control component and a fuse component, and the refrigeration unit pre-charge component, the main control component and the fuse component are respectively connected to the power battery.

5. The light-duty pure electric refrigerated vehicle according to claim 1, characterized in that: The condenser unit includes a condenser core, a cooling fan and a liquid reservoir, wherein the cooling fan is a dual-speed mode.

6. The light-duty pure electric refrigerated vehicle according to claim 1, characterized in that: The controller is a three-in-one controller, which includes PDU, OBC and DCDC.

7. The light-duty pure electric refrigerated vehicle according to claim 1, characterized in that: It also includes a defrost solenoid valve, which is arranged on the evaporator unit and connected to the condenser unit.

8. The light-duty pure electric refrigerated vehicle according to claim 1, characterized in that: The control panel unit is used to set the cabin temperature; The unit's electronic control unit is used to control the opening or closing of the evaporator unit, condenser unit, compressor unit and defrost solenoid valve to perform operations.

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