Vehicle-mounted direct-current compressor refrigeration control device

Abstract

The utility model discloses a vehicle-mounted direct-current compressor refrigeration control device which comprises a controller, a vehicle-mounted 270VDC power supply, a vehicle-mounted 26VDC power supply, a pre-charging circuit, a return air temperature sensor, a return air humidity sensor, an environment temperature sensor, an exhaust temperature sensor and a low-voltage protection switch. One output of the vehicle-mounted 270VDC power supply is connected with the power supply end of the controller, the other output is connected with the input end of the pre-charging circuit, and the output end of the pre-charging circuit is connected with the direct-current compressor; the first output of the vehicle-mounted 26VDC power supply is connected with the power supply end of the controller, the second output is connected with the outdoor unit fan, and the third output is connected with the indoor unit fan; the controller is in control connection with the direct-current compressor, the outdoor unit, the indoor unit fan and the pre-charging circuit, and the return air temperature sensor, the return air humidity sensor, the environment temperature sensor, the exhaust temperature sensor and the air conditioner low-voltage protection switch are connected with the controller. The utility model has the advantages of reliable operation and high control precision.

Description

Technical Field

[0001] The utility model relates to the field of vehicle air conditioner control devices, and particularly to a vehicle-mounted DC compressor refrigeration control device. Background Technique

[0002] At present, many vehicle air conditioners are directly driven or powered by the vehicle engine. Due to the continuous change of the load, the engine speed of the vehicle changes, resulting in the abnormal operation of the vehicle air conditioner. At present, the vehicle air conditioner control system is difficult to solve these problems and difficult to meet the requirements of new energy vehicles and special vehicles for the control reliability of vehicle air conditioners. Content of the Utility Model

[0003] The utility model provides a vehicle-mounted DC compressor refrigeration control device to solve the problems existing in the existing vehicle air conditioner controller.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0005] A vehicle-mounted DC compressor refrigeration control device, characterized by comprising a controller, a vehicle-mounted 270VDC lithium battery power supply, a vehicle-mounted 26VDC lithium battery power supply, a pre-charge circuit, as well as a return air temperature sensor, a return air humidity sensor, an ambient temperature sensor, an exhaust temperature sensor, and an air conditioner low-pressure protection switch; wherein the vehicle-mounted 270VDC lithium battery power supply has two outputs. One output of the vehicle-mounted 270VDC lithium battery power supply is connected to a power supply terminal of the controller, and the other output of the vehicle-mounted 270VDC lithium battery power supply is connected to the power supply input terminal of the pre-charge circuit through an air switch. The output terminal of the pre-charge circuit is connected to the power supply terminal of the DC compressor in the vehicle air conditioner;

[0006] The vehicle-mounted 26VDC lithium battery power supply has three outputs. The first output of the vehicle-mounted 26VDC lithium battery power supply is connected to another power supply terminal of the controller through an insurance fuse. The second output of the vehicle-mounted 26VDC lithium battery power supply is connected to the power supply terminal of the outdoor unit fan in the vehicle air conditioner through an air switch. The third output of the vehicle-mounted 26VDC power supply is connected to the power supply terminal of the indoor unit fan in the vehicle air conditioner through an air switch;

[0007] The controller is connected to the DC compressor through the CAN terminal for control. The controller is respectively connected to the outdoor unit fan and the indoor unit fan through two different PWM terminals for control. The controller is also connected to the pre-charge circuit through the signal output terminal for control; in the controller, the CAN terminal adopts an independent isolation control signal and is sent to the DC compressor. The two PWM terminals of the controller respectively adopt independent isolation PWM control signals and are sent to the outdoor unit fan and the indoor unit fan one by one in a corresponding manner;

[0008] The described return air temperature sensor is used to measure the return air temperature of the air conditioner; the described return air humidity sensor is used to measure the return air humidity of the vehicle-mounted air conditioner; the described ambient temperature sensor is used to measure the ambient temperature outside the vehicle; the described exhaust gas temperature sensor is used to measure the exhaust gas temperature of the vehicle-mounted air conditioner; the described low-pressure pressure switch of the air conditioner is used to detect whether the pressure of the vehicle-mounted air conditioner reaches the pressure setting protection value;

[0009] The return air temperature sensor, the return air humidity sensor, the ambient temperature sensor, the exhaust gas temperature sensor, and the low-pressure protection switch of the air conditioner are respectively connected to the signal input end of the controller.

[0010] Further, the output end of the precharge circuit is connected to the power supply end of the DC compressor through a filter circuit.

[0011] Further, the controller is also connected to a manual control box through a signal input end.

[0012] Further, the controller is also communicatively connected to an external host computer through a communication port.

[0013] Further, the controller samples the supply voltage of the DC compressor and compares it with the voltage after the precharge circuit is started to determine whether the DC compressor MC can be started.

[0014] Compared with the prior art, the advantages of the present utility model are as follows:

[0015] Many vehicle-mounted air conditioners are directly driven or powered by a vehicle engine. Due to the continuous change of the load, the engine speed of the vehicle changes, resulting in the abnormal operation of the vehicle-mounted air conditioner. At present, it is difficult for the existing vehicle-mounted air conditioner control systems to solve these problems.

[0016] The present utility model adopts a two-way lithium battery power supply method, and the controller performs optimal control on the air conditioner to save electricity and energy, improve the reliability of the air conditioner operation, and overcome the problem that many vehicle-mounted air conditioners are directly driven or powered by a vehicle engine. Due to the continuous change of the load, the engine speed of the vehicle changes, resulting in the abnormal operation of the vehicle-mounted air conditioner.

[0017] Therefore, the present utility model can meet the requirements of reliable operation, high control accuracy, energy saving and low noise of the vehicle-mounted DC compressor refrigeration control device, and can be remotely operated and intelligently controlled. Description of the Drawings

[0018] Figure 1 It is the structural schematic diagram of the embodiment of the present utility model. Detailed Embodiment

[0019] The present utility model will be further described below with reference to the drawings and embodiments.

[0020] As Figure 1As shown in the figure, this embodiment discloses a vehicle-mounted DC compressor refrigeration control device, which includes a controller AP1 of JKT-220902, as well as a vehicle-mounted 270VDC power supply PS1, an air switch QF1, a pre-charge circuit YC, a filter circuit LC, a vehicle-mounted 26VDC power supply PS2, a fuse FU, an air switch QF2, an air switch QF3 of the air conditioner, a return air temperature sensor RT1, a return air humidity sensor RH1, an ambient temperature sensor RT2, an exhaust temperature sensor RT3, a low-voltage protection switch PSL, and a manual control box AP2. Among them:

[0021] The vehicle-mounted 270VDC power supply PS1 has two outputs. One output of the vehicle-mounted 270VDC power supply PS1 is connected to the input end of the air switch QF1 through a wire X1. The other output of the vehicle-mounted 270VDC power supply PS1 is connected to the power supply terminal L1 of the controller AP1 through a wire X5. The output end of the air switch QF1 is connected to the power input end of the pre-charge circuit YC through a wire X2. The output end of the pre-charge circuit YC is connected to the input end of the filter circuit LC through a wire X3. The output end of the filter circuit LC is connected to the power supply terminal of the DC compressor MC in the vehicle-mounted air conditioner through a wire X4. The signal output end YC of the controller AP1 is connected to the control end of the pre-charge circuit YC through a core shielded wire X6. Thus, the controller AP1 can control the operation of the pre-charge circuit YC. The CAN end of the controller AP1 is connected to the control end of the DC compressor MC through a 4-core shielded wire X7. Thus, the controller AP1 controls the operation of the DC compressor MC in a CAN communication mode.

[0022] The vehicle-mounted 26VDC power supply PS2 has three outputs. The first output of the vehicle-mounted 26VDC power supply PS2 is connected to the input end of the fuse FU through a wire X9. The output end of the fuse FU is connected to another power supply terminal L2 of the controller AP1 through a wire X12. The second output of the vehicle-mounted 26VDC power supply PS2 is connected to the input end of the air switch QF2 through a wire X10. The output end of the air switch QF2 is connected to the power supply terminal of the outdoor unit fan MFW of the vehicle-mounted air conditioner through a wire X13. The third output of the vehicle-mounted 26VDC power supply PS2 is connected to the input end of the air switch QF3 through a wire X11. The output end of the air switch QF3 is connected to the power supply terminal of the indoor unit fan MFN of the vehicle-mounted air conditioner through a wire X14.

[0023] One PWM signal output end PWM1 of the controller AP1 is connected to the control end of the outdoor unit fan MFW through a wire X15. Another PWM signal output end PWM2 of the controller AP1 is connected to the power supply terminal of the indoor unit fan MFN through a wire X16. Thus, the controller AP1 controls the operation of the outdoor unit fan MFW and the indoor unit fan MFN of the vehicle-mounted air conditioner in a PWM mode.

[0024] The described return air temperature sensor is used to measure the return air temperature of the air conditioner; the described return air humidity sensor is used to measure the return air humidity of the vehicle-mounted air conditioner; the described ambient temperature sensor is used to measure the ambient temperature outside the vehicle; the described exhaust gas temperature sensor is used to measure the exhaust gas temperature of the vehicle-mounted air conditioner; the described low-pressure pressure switch of the air conditioner is used to detect whether the pressure of the vehicle-mounted air conditioner reaches the pressure setting protection value;

[0025] The return air temperature sensor RT1 is connected to the signal input terminal RT1 of the controller AP1 through the wire X17, the return air humidity sensor RH1 is connected to the signal input terminal RH1 of the controller AP1 through the wire X18, the ambient temperature sensor RT2 is connected to the signal input terminal RT2 of the controller AP1 through the wire X19, the exhaust gas temperature sensor RT3 is connected to the signal input terminal RT3 of the controller AP1 through the wire X20, and the low-pressure protection switch PSL is connected to the signal input terminal SP of the controller AP1 through the wire X21.

[0026] The manual control box AP2 is connected to the signal input terminal X of the controller AP1 through the 7-core shielded wire X8. The communication terminals FlexRay -A and FlexRay –B of the controller AP1 are respectively connected to the external host computer AP3 for communication through the 4-core shielded wires X22 and X23. The control software is integrated in the controller AP1.

[0027] This embodiment has dual power inputs of the vehicle-mounted 270VDC power supply PS1 and the vehicle-mounted 26VDC power supply PS2, which can improve the power supply capacity.

[0028] The controller AP1 can output PWM1, PWM2, CAN, and YC control signals, which are respectively used to control the outdoor unit fan MFW, the indoor unit fan MFN, the DC compressor MC, and the pre-charge circuit YC. To prevent electromagnetic harmonics of the DC compressor MC, the outdoor unit fan MFW, and the indoor unit fan MFN from interfering with each other and generating high-order harmonics that cause heating and even burning, the PWM signal output terminal PWM1, the PWM signal output terminal PWM2, and the CAN terminal in the controller AP1 respectively use EE13 independent transformers to generate 5V signals.

[0029] The DC compressor MC adopts PWM speed regulation control with CAN communication, and can automatically adjust the refrigerating capacity according to the change of the ambient temperature in the vehicle occupant compartment. The input DC voltage and the speed change range of the DC compressor MC are determined to obtain the optimal speed of the DC compressor MC and the charging time Te (determine the R and C parameters) required for the pre-charge circuit YC of the power supply circuit. A filter circuit LC is added to the incoming line of the DC compressor MC to reduce the influence of the high-order harmonics generated during the operation of the DC compressor MC on the capacitor C in the pre-charge circuit YC.

[0030] The controller AP1 uploads the detected parameters of the return air temperature sensor RT1, return air humidity sensor RH1, ambient temperature sensor RT2, and exhaust temperature sensor RT3 to the manual control box AP2, and the controller AP1 detects the air conditioner low-pressure protection PSL switch to protect the refrigeration system.

[0031] The control software of the outdoor unit fan MFW, indoor unit fan MFN, and pre-charge circuit YC is installed on the controller AP1, and the air conditioner is optimally controlled through the controller AP1. Since the input voltage of the DC compressor MC is 200VDC~520VDC, and the operating speed of the DC compressor MC is 2000rpm~6000rpm,

[0032] The actual input voltage of the DC compressor MC is 270VDC. The compressor speed n is determined according to the current I of the DC compressor MC. When the current I of the DC compressor MC ≤ 6.5A, the compressor operates at the maximum speed of 6000rpm. When the ambient temperature T ≥ 42°C and the current I of the DC compressor MC ≥ 6.5A, the operating speed of the DC compressor MC decreases at a speed of 200 rpm to keep the operating current I of the DC compressor MC ≤ 6.5A. When the operating speed n of the DC compressor MC ≤ 2500 rpm, the DC compressor MC stops. The outdoor unit fan MFW and indoor unit fan MFN are stepless speed regulation controlled by PWM, and the speed is adjusted according to the condensation pressure and the size of the circulating fan air volume to intelligently control the cooling capacity of the air conditioner and reach the required ambient temperature to save energy.

[0033] The specific working process of the present utility model is as follows: After the device is powered on, it enters the standby state, the display screen of the manual control box AP2 lights up, and the air conditioner starts to detect the power supply of the vehicle-mounted 270VDC power supply PS1 and the vehicle-mounted 26VDC power supply PS2. If the supply voltage DC270V or DC26V is abnormal, the air conditioner control panel displays the fault (indicator light) and the fault code and uploads it to the bus;

[0034] When the manual control box AP2 receives the local startup or the remote communication startup signal from the upper computer AP3, it enters the automatic temperature control state according to the temperature set by the user (the preset temperature is 22°C, which can be changed, and the last set temperature is memorized each time it is powered on later, and the temperature setting value is powered off and retained);

[0035] After the vehicle-mounted air conditioner enters the automatic working state, the operation light outputs. After the vehicle-mounted air conditioner fails, the fault light outputs, and the corresponding fault code is displayed at the same time.

[0036] Press the "On / Off" key on the manual control box AP2 to start the machine, or send the instruction to the vehicle-mounted air conditioner to start through the FlexRay bus; After the air conditioner self-checks and starts, it enters the automatic working mode, and judges according to the set temperature point (the default set temperature at startup is 22°C), and automatically executes the switching of the refrigeration and ventilation working states;

[0037] During automatic operation, the temperature can be set at any working time, and it can automatically judge according to the set temperature point in the following state ①. The temperature judgment is as follows (where T represents the room temperature and T0 represents the set temperature in the following):

[0038] ① When T≥T0 + 6°C, the DC compressor MC runs at high speed (4000 rpm), and the indoor unit fan MFN rotates at high speed (100%) for refrigeration;

[0039] When T≥T0 + 4°C, the DC compressor MC runs at high speed (4000 rpm), and the indoor unit fan MFN rotates at medium speed (85%) for refrigeration;

[0040] When T≥T0 + 2°C, the DC compressor MC runs at high speed (4000 rpm), and the indoor unit fan MFN rotates at low speed (70%) for refrigeration;

[0041] When T0 + 2°C > T≥T0°C, the DC compressor MC adjusts its speed (the speed adjustment range of the compressor is 5000 rpm - 2500 rpm, and the descending rate ≤ 200 rpm), and the indoor unit fan MFN rotates at low speed (70%) for refrigeration;

[0042] Continue to work until T = T0, and stop refrigeration (the speed of the DC compressor MC drops to 0, and the pre - charge circuit is disconnected); when T≤15°C, there is no refrigeration; when T≥30°C, it is high - speed wind (100%) for refrigeration.

[0043] ② When first powered on and during automatic operation, the wind speed defaults to high - speed wind (100%), and it can be manually selected as high (100%), medium (85%), or low (70%). After manual or remote control settings, the last setting shall prevail. After power - off and restart, the wind speed still defaults to high - speed wind (the wind speed can be set on the hand - control box or remotely during the fully automatic process);

[0044] ③ Before the DC compressor MC starts, the outdoor unit fan MFW starts first for 6 seconds, and after the DC compressor MC stops, the outdoor unit fan MFW delays for 30 seconds to stop;

[0045] ④ After the DC compressor MC starts and runs at 2500 rpm for 20 seconds, it then responds to the speed - adjustment demand;

[0046] ⑤ DC compressor MC start - stop control: Before the DC 5 compressor MC is powered on and starts, the relay of the pre - charge circuit YC is disconnected. When the DC compressor MC starts, the relay of the pre - charge circuit YC closes, and it delays for 10 seconds while detecting that the DC voltage supplying the compressor is greater than the minimum rated supply voltage of the system main power supply (DC250V);

[0047] ⑥ The controller AP1 reduces the frequency and limits the speed according to the ambient temperature detected by the ambient temperature sensor RT2 to ensure the normal operation of the air conditioner at high temperatures.

[0048] When the ambient temperature ≥ 45°C, the rotational speed of the DC compressor MC starts to decrease and is speed-limited, decreasing at a rate of 50 rpm / °C. When the ambient temperature Th ≥ 55°C, the DC compressor MC operates at a rotational speed of 3000 rpm / s.

[0049] When the ambient temperature RT2 ≤ 36°C, the outdoor unit fan MFW runs at low speed (85%). When the ambient temperature ≥ 36°C, the outdoor unit fan MFW runs at high speed (98%). When the ambient temperature drops from a high temperature to 34°C, the outdoor unit fan MFW drops from high speed (98%) to low speed (85%) operation;

[0050] ⑦ When the controller AP1 detects that the exhaust temperature ≥ 105°C according to the exhaust temperature sensor RT3, it starts to adjust the speed for cooling.

[0051] Generally speaking, the present utility model instantaneously feeds back the outlet air temperature T to the controller AP1 through the return air temperature sensor RT1, compares the return air temperature T with the set value Te. When the temperature sensed by the return air temperature sensor RT1 is higher than the set value, the controller AP1 gives a signal and the DC compressor MC operates for refrigeration; when the outlet air temperature is lower than the set value Te - temperature difference ΔT, the controller AP1 gives a signal and the DC compressor MC stops working. When the system is protected, the DC compressor MC stops working.

[0052] The preferred embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. The embodiments described in the present utility model are only descriptions of the preferred embodiments of the present utility model, and do not limit the concept and scope of the present utility model. Among the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without contradiction. As long as such a combination does not violate the idea of the present utility model, it should also be regarded as the content disclosed in the present disclosure. To avoid unnecessary repetition, the present utility model does not separately describe various possible combination methods.

[0053] The present utility model is not limited to the specific details in the above embodiments. Within the technical concept scope of the present utility model and without departing from the design idea of the present utility model, various variations and improvements made by those skilled in the art to the technical solution of the present utility model should all fall within the protection scope of the present utility model. The technical content claimed by the present utility model has been fully recorded in the claims.

Claims

1. A vehicle-mounted DC compressor refrigeration control device, characterized in that It includes a controller, a vehicle-mounted 270VDC lithium battery power supply, a vehicle-mounted 26VDC lithium battery power supply, a pre-charge circuit, as well as a return air temperature sensor, a return air humidity sensor, an ambient temperature sensor, an exhaust temperature sensor, and an air-conditioning low-pressure protection switch; among them, the vehicle-mounted 270VDC power supply has two outputs. One output of the vehicle-mounted 270VDC power supply is connected to a power supply terminal of the controller, and the other output of the vehicle-mounted 270VDC power supply is connected to the power supply input terminal of the pre-charge circuit through an air switch. The output terminal of the pre-charge circuit is connected to the power supply terminal of the DC compressor in the vehicle-mounted air conditioner; The vehicle-mounted 26VDC power supply has three outputs. The first output of the vehicle-mounted 26VDC power supply is connected to another power supply terminal of the controller through an insurance fuse. The second output of the vehicle-mounted 26VDC power supply is connected to the power supply terminal of the outdoor unit fan in the vehicle-mounted air conditioner through an air switch. The third output of the vehicle-mounted 26VDC power supply is connected to the power supply terminal of the indoor unit fan in the vehicle-mounted air conditioner through an air switch; The controller is connected to the DC compressor through the CAN terminal for control. The controller is respectively connected to the outdoor unit fan and the indoor unit fan through two different PWM terminals for control. The controller is also connected to the pre-charge circuit through the signal output terminal for control; in the controller, the CAN terminal uses an independent transformer to generate a control signal and send it to the DC compressor. The two PWM terminals of the controller respectively use independent isolated PWM control signals and are sent to the outdoor unit fan and the indoor unit fan in one-to-one correspondence; The return air temperature sensor is used to measure the return air temperature of the air conditioner; the return air humidity sensor is used to measure the return air humidity of the vehicle-mounted air conditioner; the ambient temperature sensor is used to measure the ambient temperature outside the vehicle; the exhaust temperature sensor is used to measure the exhaust temperature of the vehicle-mounted air conditioner; the air-conditioning low-pressure pressure switch is used to detect whether the pressure of the vehicle-mounted air conditioner reaches the pressure setting protection value; The return air temperature sensor, the return air humidity sensor, the ambient temperature sensor, the exhaust temperature sensor, and the air-conditioning low-pressure pressure switch are respectively connected to the signal input terminal of the controller.

2. The vehicle-mounted DC compressor refrigeration control device according to claim 1, characterized in that The output terminal of the pre-charge circuit is connected to the power supply terminal of the DC compressor through a filter circuit.

3. A vehicle-mounted DC compressor refrigeration control device according to claim 1, characterized in that, The controller is also connected to a manual control box through the signal input terminal.

4. The vehicle-mounted DC compressor refrigeration control device according to claim 1, characterized in that, The controller is also communicatively connected to an external host computer through the communication terminal.

5. A vehicle-mounted DC compressor refrigeration control device according to any one of claims 1-4, characterized in that, The controller samples the supply voltage of the DC compressor and compares it with the voltage after the pre-charge circuit is started to determine whether the DC compressor MC can be started.

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