Refrigeration control method, device and construction machine

Abstract

The application relates to a refrigeration control method, device and engineering machinery, and relates to the technical field of engineering machinery. The refrigeration control method comprises the following steps: receiving a refrigeration instruction; if the refrigeration instruction indicates that the cab and the battery both need refrigeration, obtaining a first temperature difference and a second temperature difference; according to the first temperature difference and the second temperature difference, outputting a priority demand instruction; and according to the priority demand instruction, adjusting the opening degree of a first electronic expansion valve and a second electronic expansion valve. The refrigeration control method, device and engineering machinery provided in the application can effectively determine the refrigeration priority of the cab and the battery when the cab and the battery both need refrigeration, and can reasonably control the opening degree of the electronic expansion valve corresponding to the cab and the battery, so that the refrigeration capacity distribution of the cab and the battery is more reasonable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of construction machinery, and in particular to a refrigeration control method and device and construction machinery. BACKGROUND

[0002] Currently, for an electric vehicle, there is a working condition in which both the cab and the battery have refrigeration requirements. In the related art, in the case where both the cab and the battery have refrigeration requirements, it is difficult to determine the refrigeration priority of the cab and the battery, which can easily lead to unreasonable opening degrees of the electronic expansion valves corresponding to the cab and the battery, and further lead to unreasonable refrigeration capacity distribution of the cab and the battery. SUMMARY

[0003] To solve the above technical problem, embodiments of the present application provide a refrigeration control method, device and construction machinery, which effectively determine the refrigeration priority of the cab and the battery in the case where both the cab and the battery have refrigeration requirements, and reasonably control the opening degrees of the electronic expansion valves corresponding to the cab and the battery, so as to make the refrigeration capacity distribution of the cab and the battery more reasonable.

[0004] In a first aspect, a refrigeration control method is provided, comprising:

[0005] receiving a refrigeration instruction;

[0006] if the refrigeration instruction indicates that both the cab and the battery need refrigeration, obtaining a first temperature difference and a second temperature difference; wherein the first temperature difference represents a temperature difference between an actual temperature in the cab and a first target temperature; and the second temperature difference represents a temperature difference between a water inlet temperature in the battery and a second target temperature;

[0007] outputting a priority requirement instruction according to the first temperature difference and the second temperature difference; wherein the priority requirement instruction includes that the refrigeration priority of the battery is higher than that of the cab, or the refrigeration priority of the cab is not lower than that of the battery;

[0008] adjusting the opening degrees of a first electronic expansion valve and a second electronic expansion valve according to the priority requirement instruction; wherein the first electronic expansion valve is used to adjust the flow of fluid flowing to the cab; and the second electronic expansion valve is used to adjust the flow of fluid flowing to the battery.

[0009] According to the first aspect of the present application, the outputting of the priority requirement instruction according to the first temperature difference and the second temperature difference includes:

[0010] if the difference between the second temperature difference and the first temperature difference is greater than a preset threshold value, outputting a priority requirement instruction indicating that the refrigeration priority of the battery is higher than that of the cab;

[0011] if a difference between the second temperature difference and the first temperature difference is less than or equal to the preset threshold value, outputting a priority demand instruction representing that the refrigeration priority of the cab is not lower than the refrigeration priority of the battery.

[0012] According to a first aspect of the present application, the adjusting the opening degree of the first electronic expansion valve and the second electronic expansion valve according to the priority demand instruction comprises:

[0013] obtaining a cab target overheat degree and a battery target overheat degree according to the priority demand instruction;

[0014] obtaining a first actual overheat degree of the cab and a second actual overheat degree of the battery;

[0015] adjusting the opening degree of the first electronic expansion valve according to the cab target overheat degree and the first actual overheat degree;

[0016] adjusting the opening degree of the second electronic expansion valve according to the battery target overheat degree and the second actual overheat degree.

[0017] According to a first aspect of the present application, the obtaining a cab target overheat degree and a battery target overheat degree according to the priority demand instruction comprises:

[0018] if the priority demand instruction represents that the refrigeration priority of the cab is not lower than the refrigeration priority of the battery, setting the battery target overheat degree equal to a sum of the cab target overheat degree, the second temperature difference and a preset modification factor.

[0019] According to a first aspect of the present application, the obtaining a cab target overheat degree and a battery target overheat degree according to the priority demand instruction comprises:

[0020] if the priority demand instruction represents that the refrigeration priority of the battery is higher than the refrigeration priority of the cab, setting the cab target overheat degree equal to a sum of the battery target overheat degree, the first temperature difference and a preset modification factor.

[0021] According to a first aspect of the present application, the adjusting the opening degree of the first electronic expansion valve according to the cab target overheat degree and the first actual overheat degree comprises:

[0022] if the first actual overheat degree is greater than the cab target overheat degree, increasing the opening degree of the first electronic expansion valve;

[0023] if the first actual overheat degree is less than or equal to the cab target overheat degree, decreasing the opening degree of the first electronic expansion valve.

[0024] According to the first aspect of the present application, adjusting the opening of the second electronic expansion valve according to the target battery superheat and the second actual superheat includes:

[0025] If the second actual superheat is greater than the battery target superheat, increasing the opening of the second electronic expansion valve;

[0026] If the second actual superheat is less than or equal to the battery target superheat, the opening of the second electronic expansion valve is reduced.

[0027] According to the first aspect of the present application, after obtaining the first temperature difference and the second temperature difference, the refrigeration control method further includes:

[0028] obtaining a first speed of the compressor according to the actual temperature in the cab and the first target temperature;

[0029] obtaining a second speed of the compressor according to an inlet water temperature in the battery and the second target temperature;

[0030] The actual speed of the compressor is adjusted to the sum of the first speed and the second speed.

[0031] In a second aspect, a refrigeration control device is further provided, comprising:

[0032] A first receiving module, configured to receive a cooling instruction;

[0033] a first acquisition module configured to acquire a first temperature difference and a second temperature difference if the cooling instruction indicates that both the cab and the battery require cooling; wherein the first temperature difference represents the temperature difference between the actual temperature in the cab and a first target temperature; and the second temperature difference represents the temperature difference between the water inlet temperature in the battery and a second target temperature;

[0034] a first output module, configured to output a priority demand instruction based on the first temperature difference and the second temperature difference; wherein the priority demand instruction includes that the cooling priority of the battery is higher than the cooling priority of the cab, or that the cooling priority of the cab is not lower than the cooling priority of the battery;

[0035] The first adjustment module is used to adjust the opening of the first electronic expansion valve and the second electronic expansion valve according to the priority demand instruction; wherein the first electronic expansion valve is used to adjust the flow rate of the fluid flowing to the cab; the second electronic expansion valve is used to adjust the flow rate of the fluid flowing to the battery.

[0036] In a third aspect, an engineering machine is further provided, comprising:

[0037] the body, which houses the cab and batteries;

[0038] a first electronic expansion valve for adjusting a flow rate of fluid flowing to the cab;

[0039] a second electronic expansion valve for adjusting a flow rate of fluid flowing to the battery;

[0040] The refrigeration control device as described in the foregoing embodiments is in communication connection with the first electronic expansion valve and the second electronic expansion valve.

[0041] The fourth aspect further provides an electronic device, comprising a processor and a memory for storing instructions executable by the processor, wherein the processor is configured to execute the refrigeration control method as described in the foregoing embodiments.

[0042] The fifth aspect further provides a computer-readable storage medium storing a computer program for executing the refrigeration control method as described in the foregoing embodiments.

[0043] The refrigeration control method, device and construction machinery provided by the embodiments of the present application have the following advantages. In the first aspect, the first temperature difference and the second temperature difference can be used to determine the degree of refrigeration demand of the cab and the battery, and the refrigeration priority of the cab and the battery can be effectively determined. In the second aspect, after the refrigeration priority of the cab and the battery is determined, the opening degree of the first electronic expansion valve and the second electronic expansion valve can be reasonably adjusted according to the priority demand instruction, so that the fluid flow rate flowing to the cab and the fluid flow rate flowing to the battery can be reasonably controlled, and the distribution result of the fluid flow rate by the first electronic valve and the second electronic valve can meet the priority demand instruction, thereby ensuring that the refrigeration amount distribution of the cab and the battery is more reasonable. BRIEF DESCRIPTION OF DRAWINGS

[0044] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which:

[0045] Figure 1 A flowchart of a refrigeration control method provided by an exemplary embodiment of the present application.

[0046] Figure 2 A flowchart of outputting a priority demand instruction according to a first temperature difference and a second temperature difference provided by an exemplary embodiment of the present application.

[0047] Figure 3 A flowchart of adjusting an opening degree of a first electronic expansion valve and a second electronic expansion valve according to a priority demand instruction provided by an exemplary embodiment of the present application.

[0048] Figure 4 A flowchart of obtaining a target cab overheat degree and a target battery overheat degree according to a priority demand instruction is provided in accordance with an exemplary embodiment of the present application.

[0049] Figure 5 A relationship diagram between the target superheat degree of the cab and the first temperature difference is provided for an exemplary embodiment of the present application.

[0050] Figure 6 A diagram showing the relationship between the target battery superheat and the second temperature difference provided by an exemplary embodiment of the present application.

[0051] Figure 7 A flowchart of adjusting the opening of a first electronic expansion valve according to a target superheat degree of a cab and a first actual superheat degree is provided in accordance with an exemplary embodiment of the present application.

[0052] Figure 8 An exemplary embodiment of the present application provides a flowchart of adjusting the opening of a second electronic expansion valve according to a target superheat degree of a battery and a second actual superheat degree.

[0053] Figure 9 A flowchart of a refrigeration control method provided by another exemplary embodiment of the present application.

[0054] Figure 10 This is a structural block diagram of a refrigeration control device provided by an exemplary embodiment of the present application.

[0055] Figure 11 This is a structural block diagram of a refrigeration control device provided by another exemplary embodiment of the present application.

[0056] Figure 12 A structural block diagram of an engineering machine provided as an exemplary embodiment of the present application.

[0057] Figure 13 A structural block diagram of an electronic device provided as an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0058] Below, the exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the exemplary embodiments described herein.

[0059] Figure 1 A flowchart of a refrigeration control method provided by an exemplary embodiment of the present application.

[0060] like Figure 1 As shown, the refrigeration control method provided in the embodiment of the present application may include:

[0061] S210: receiving a refrigeration instruction.

[0062] In an embodiment, the refrigeration instruction can represent that both the cab and the battery need to be refrigerated.

[0063] In an embodiment, the refrigeration instruction can represent that only the cab needs to be refrigerated.

[0064] In an embodiment, the refrigeration instruction can represent that only the battery needs to be refrigerated.

[0065] S220: If the refrigeration instruction represents that both the cab and the battery need to be refrigerated, obtaining a first temperature difference and a second temperature difference.

[0066] Specifically, the first temperature difference can be understood as the temperature difference between the actual temperature in the cab and the first target temperature. The second temperature difference can be understood as the temperature difference between the water inlet temperature in the battery and the second target temperature.

[0067] It should be noted that the first target temperature can be understood as the temperature that needs to be reached in the cab after refrigeration. The second target temperature can be understood as the temperature that the water inlet temperature of the battery needs to reach after refrigeration.

[0068] It should be noted that the first target temperature and the second target temperature can be determined according to actual refrigeration requirements.

[0069] In an embodiment, the actual temperature in the cab can be detected by a temperature sensor, and the first temperature difference can be calculated in combination with the first target temperature.

[0070] In an embodiment, the water inlet temperature in the battery can be detected by a temperature sensor, and the second temperature difference can be calculated in combination with the second target temperature.

[0071] S230: Outputting a priority demand instruction according to the first temperature difference and the second temperature difference.

[0072] It should be noted that the priority demand instruction can include a demand instruction that the refrigeration priority of the battery is higher than the refrigeration priority of the cab, or a demand instruction that the refrigeration priority of the cab is not lower than the refrigeration priority of the battery.

[0073] Specifically, the first temperature difference can be used to determine the gap between the actual temperature of the cab and the first target temperature, so as to determine the degree of refrigeration demand of the cab; the second temperature difference can be used to determine the gap between the water inlet temperature of the battery and the second target temperature, so as to determine the degree of refrigeration demand of the battery. According to the first temperature difference and the second temperature difference, it can be determined which of the refrigeration priority of the battery and the refrigeration priority of the cab is higher, so as to output the corresponding priority demand instruction.

[0074] S240: Adjusting the opening degree of the first electronic expansion valve and the second electronic expansion valve according to the priority demand instruction.

[0075] It should be noted that the first electronic valve can be used to adjust the flow of fluid (such as refrigerant) flowing to the cab, and the second electronic valve can be used to adjust the flow of fluid (such as refrigerant) flowing to the battery.

[0076] Specifically, after determining the priority of the cab and the battery for refrigeration demand, the opening degree of the first electronic expansion valve and the second electronic expansion valve can be adjusted according to the priority demand instruction, so as to reasonably control the fluid flow to the cab and the fluid flow to the battery, so that the distribution result of the fluid flow by the first electronic valve and the second electronic valve can meet the priority demand instruction, and the refrigeration capacity distribution of the cab and the battery is more reasonable.

[0077] The refrigeration control method provided by the embodiment of the present application has the following advantages: first, the degree of refrigeration demand of the cab and the battery can be determined by the first temperature difference and the second temperature difference, and the refrigeration priority of the cab and the battery is effectively determined; second, after determining the refrigeration priority of the cab and the battery, the opening degree of the first electronic expansion valve and the second electronic expansion valve is adjusted according to the priority demand instruction, so as to reasonably control the fluid flow to the cab and the fluid flow to the battery, so that the distribution result of the fluid flow by the first electronic valve and the second electronic valve can meet the priority demand instruction, and the refrigeration capacity distribution of the cab and the battery is more reasonable.

[0078] Figure 2 The flowchart for outputting the priority demand instruction according to the first temperature difference and the second temperature difference is provided for an exemplary embodiment of the present application. As shown in Figure 2 , step S230 can include:

[0079] S231: If the difference between the second temperature difference and the first temperature difference is greater than a preset threshold, outputting a priority demand instruction representing that the refrigeration priority of the battery is higher than that of the cab.

[0080] Specifically, the difference between the second temperature difference and the first temperature difference being greater than the preset threshold can be equivalent to the following relationship formula one:

[0081] ΔT2-ΔT1>μ;

[0082] Wherein, ΔT2 represents the second temperature difference; ΔT1 represents the first temperature difference; and μ represents the preset threshold.

[0083] If the difference between the second temperature difference and the first temperature difference is greater than the preset threshold value, it can be considered that the water inlet temperature of the current battery exceeds the degree to which the actual temperature of the cab exceeds the first target temperature by the degree to which the second target temperature exceeds the degree to which the actual temperature of the cab exceeds the first target temperature, that is, the current cooling demand degree of the battery exceeds the current cooling demand degree of the cab, or the current cooling demand degree of the battery is equivalent to the current cooling demand degree of the cab. Therefore, the priority demand instruction indicating that the cooling priority of the battery is higher than the cooling priority of the cab can be output.

[0084] S232: If the difference between the second temperature difference and the first temperature difference is less than or equal to the preset threshold value, output the priority demand instruction indicating that the cooling priority of the cab is not lower than the cooling priority of the battery.

[0085] Specifically, the difference between the second temperature difference and the first temperature difference being less than or equal to the preset threshold value can be equivalent to the following relationship two:

[0086] ΔT2-ΔT1≤μ;

[0087] Wherein, ΔT2 represents the second temperature difference; ΔT1 represents the first temperature difference; μ represents the preset threshold value.

[0088] If the difference between the second temperature difference and the first temperature difference is less than or equal to the preset threshold value, it can be considered that the degree to which the actual temperature of the cab exceeds the first target temperature is greater than the degree to which the water inlet temperature of the current battery exceeds the second target temperature, or the degree to which the actual temperature of the cab exceeds the first target temperature is equivalent to the degree to which the water inlet temperature of the current battery exceeds the second target temperature. That is, the current cooling demand degree of the cab exceeds the current cooling demand degree of the battery, or the current cooling demand degree of the cab is equivalent to the current cooling demand degree of the battery. Therefore, the priority demand instruction indicating that the cooling priority of the cab is not lower than the cooling priority of the battery can be output.

[0089] It should be noted that if the preset threshold value is set to be large, the comfort in the cab can be improved as soon as possible (the cab is cooled as soon as possible) while ensuring the safety of the battery (the battery is preferentially cooled); if the preset threshold value is set to be small, the battery and the cab can be cooled down more evenly. Therefore, the preset threshold value can be set according to the actual situation, and the preset threshold value is not limited in the embodiments of the present application.

[0090] Figure 3 The flowchart of adjusting the opening degree of the first electronic expansion valve and the second electronic expansion valve according to the priority demand instruction provided by an exemplary embodiment of the present application is shown in the figure. Figure 3 As shown in the figure, step S240 includes:

[0091] S241: Obtain the target overheat degree of the cab and the target overheat degree of the battery according to the priority demand instruction.

[0092] S242: Obtain the first actual superheat degree of the cab and the second actual superheat degree of the battery.

[0093] Specifically, the cab target superheat degree refers to the ideal difference between the superheated temperature and the saturated temperature of the refrigerant flowing to the cab under the same evaporation pressure. The first actual superheat degree of the cab refers to the actual difference between the superheated temperature and the saturated temperature of the refrigerant flowing to the cab under the same evaporation pressure.

[0094] Similarly, the battery target superheat degree refers to the ideal difference between the superheated temperature and the saturated temperature of the refrigerant flowing to the battery under the same evaporation pressure. The second actual superheat degree of the battery refers to the actual difference between the superheated temperature and the saturated temperature of the refrigerant flowing to the battery under the same evaporation pressure.

[0095] It should be noted that the priority relationship represented by the priority demand instruction can be reflected by the relationship between the cab target superheat degree and the battery target superheat degree. After determining one of the cab target superheat degree and the battery target superheat degree, the value of the other can be determined according to the corresponding relationship between the two. This will be described in detail later.

[0096] In the process of executing step S242, taking the first actual superheat degree of the cab as an example, the actual temperature of the refrigerant flowing to the cab and the evaporation pressure can be detected. The evaporation pressure has a one-to-one correspondence with the saturated temperature. According to the evaporation pressure, the saturated temperature of the refrigerant under the evaporation pressure can be obtained. The difference between the actual temperature and the saturated temperature can be calculated to obtain the first actual superheat degree of the cab. Similarly, the second actual superheat degree of the battery can be calculated by the foregoing process.

[0097] S243: Adjust the opening degree of the first electronic expansion valve according to the cab target superheat degree and the first actual superheat degree.

[0098] S244: Adjust the opening degree of the second electronic expansion valve according to the battery target superheat degree and the second actual superheat degree.

[0099] By executing steps S243 and S244, the opening degrees of the first electronic expansion valve and the second electronic expansion valve can be adjusted by PID feedback control, so that the first actual superheat degree gradually tends to the cab target superheat degree, and the second actual superheat degree gradually tends to the battery target superheat degree.

[0100] It should be noted that the specific process of PID feedback control is recorded in related technologies, which will not be described here.

[0101] It should be noted that before the P ID feedback control is utilized, the initial opening degree of the first electronic expansion valve can be acquired, and a first duration during which the first electronic expansion valve is at the initial opening degree can be acquired. If the first duration is greater than a first preset duration threshold, it can be considered that the first electronic expansion valve is in an open working state, and then step S243 is executed to utilize the P ID feedback control to adjust the opening degree of the first electronic expansion valve. Similarly, before the P ID feedback control is utilized, the initial opening degree of the second electronic expansion valve can be acquired, and a second duration during which the second electronic expansion valve is at the initial opening degree can be acquired. If the second duration is greater than a second preset duration threshold, it can be considered that the second electronic expansion valve is in an open working state, and then step S244 is executed to utilize the P ID feedback control to adjust the opening degree of the second electronic expansion valve.

[0102] It should be noted that in actual application, after step S210 is executed, if the refrigeration instruction represents that only the cab needs to be refrigerated, then after the cab target superheat degree (refer to the cab target superheat degree introduced below Figure 5 ) and the first actual superheat degree are acquired, the opening degree of the first electronic expansion valve can be directly adjusted. Similarly, if the refrigeration instruction represents that only the battery needs to be refrigerated, then after the battery target superheat degree (refer to the battery target superheat degree introduced below Figure 6 ) and the second actual superheat degree are acquired, the opening degree of the second electronic expansion valve can be directly adjusted.

[0103] Figure 4 A flowchart for obtaining the cab target superheat degree and the battery target superheat degree according to the priority demand instruction of an exemplary embodiment of the present application is provided. As shown in Figure 4 , step S241 can include:

[0104] S2411: If the refrigeration priority of the cab is not lower than the refrigeration priority of the battery according to the priority demand instruction, the battery target superheat degree is equal to the sum of the cab target superheat degree, the second temperature difference, and a preset modification factor.

[0105] Specifically, if the refrigeration priority of the cab is not lower than the refrigeration priority of the battery according to the priority demand instruction, the battery target superheat degree, the cab target superheat degree, the second temperature difference, and the preset modification factor satisfy the following relationship three:

[0106] T cab =T1;

[0107] T Batt =T Cab +β+γ;

[0108] Wherein, T cab represents the cab target superheat degree; T Batt represents the battery target superheat degree; β represents the second temperature difference; and γ represents the preset modification factor.

[0109] Figure 5 The relationship between the cab target superheat and the first temperature difference is provided for an exemplary embodiment of the present application. Figure 5 The proportional relationship between T1 and the first temperature difference is shown in the case where the refrigeration priority of the cab is not lower than the refrigeration priority of the battery. The value of T1 can be determined according to the first temperature difference, and then the battery target superheat T can be obtained according to the aforementioned relationship three. Batt .

[0110] It should be noted that, Figure 5 Only one of the relationships between the cab target superheat and the first temperature difference is exemplarily shown, and other functional relationships between the cab target superheat and the first temperature difference can also be used in actual applications.

[0111] It should be noted that in relationship three, the cab target superheat is less than the battery target superheat, so that the opening of the first electronic expansion valve can be preferentially increased in the subsequent process to preferentially meet the refrigeration demand of the cab, and then the refrigeration demand of the battery is met.

[0112] It should be noted that in the process of refrigerating the battery, the second temperature difference will gradually decrease, and the value of the battery target superheat will also dynamically change. The battery target superheat will gradually approach the cab target superheat, thereby ensuring that the refrigeration amounts of the cab and the battery are more evenly distributed.

[0113] It should be noted that the preset modification factor γ can ensure that when the second temperature difference is zero, the cab target superheat is still less than the battery target superheat, and the opening of the first electronic expansion valve can still be preferentially increased to preferentially meet the refrigeration demand of the cab.

[0114] It should be understood that the preset modification factor γ can be set according to actual conditions, and the present application does not specifically limit the preset modification factor γ.

[0115] As shown in Figure 4 , step S241 can further include:

[0116] S2412: If the priority demand instruction represents that the refrigeration priority of the battery is higher than the refrigeration priority of the cab, the cab target superheat is equal to the sum of the battery target superheat, the first temperature difference, and the preset modification factor.

[0117] It should be noted that step S2412 and step S2411 are in parallel relationship, and do not need to be executed at the same time in the same execution cycle.

[0118] Specifically, if the priority demand instruction represents that the refrigeration priority of the battery is higher than the refrigeration priority of the cab, the cab target superheat, the battery target superheat, the first temperature difference, and the preset modification factor satisfy the following relationship four:

[0119] T Batt = T0;

[0120] T Cab = T Batt + a + g;

[0121] wherein, T Batt represents the battery target overheat degree; T cab represents the cab target overheat degree; a represents the first temperature difference; and g represents a preset modification factor.

[0122] Figure 6 A relationship diagram between the battery target overheat degree and the second temperature difference is provided for an exemplary embodiment of the present application. Figure 6 A proportional relationship between T0 and the second temperature difference is shown in the relationship diagram, in a case where the refrigeration priority of the battery is higher than the refrigeration priority of the cab. The value of T0 can be determined according to the second temperature difference, and then the cab target overheat degree T cab can be obtained according to the aforementioned relationship four.

[0123] It should be noted that, Figure 6 only one of the relationship cases between the battery target overheat degree and the second temperature difference is exemplarily shown, and other functional relationships between the battery target overheat degree and the second temperature difference can also be used in actual applications.

[0124] It should be noted that, in the relationship four, the cab target overheat degree is less than the battery target overheat degree, so that the opening of the second electronic expansion valve can be preferentially increased in the subsequent process, to preferentially meet the refrigeration demand of the battery, and then to meet the refrigeration demand of the cab.

[0125] It should be noted that, in the process of refrigerating the cab, the first temperature difference will gradually decrease, the value of the cab target overheat degree will dynamically change, and the cab target overheat degree will gradually approach the battery target overheat degree, so as to ensure that the refrigeration amount distribution of the cab and the battery is more average.

[0126] It should be noted that, the preset modification factor g can ensure that when the first temperature difference is zero, the battery target overheat degree is still less than the cab target overheat degree, and the opening of the second electronic expansion valve can still be preferentially increased, to preferentially meet the refrigeration demand of the battery.

[0127] Figure 7 A flowchart for adjusting the opening of the first electronic expansion valve according to the cab target overheat degree and the first actual overheat degree is provided for an exemplary embodiment of the present application. As shown in Figure 7 the step S243 can include:

[0128] S2431: If the first actual superheat is greater than the target superheat of the cab, increase the opening of the first electronic expansion valve.

[0129] S2432: If the first actual superheat is less than or equal to the target superheat of the cab, reduce the opening of the first electronic expansion valve.

[0130] Specifically, if the first actual superheat is greater than the target superheat of the cab, the flow rate of the refrigerant can be increased by increasing the opening of the first electronic expansion valve. The refrigerant with the increased flow rate can absorb more heat, which is beneficial to reducing the first actual superheat. The first actual superheat gradually approaches the target superheat of the cab, which can accurately control the actual temperature in the cab and improve the cooling efficiency.

[0131] Similarly, if the first actual superheat is less than or equal to the target superheat of the cab, the refrigerant flow rate can be reduced by reducing the opening of the first electronic expansion valve. After the flow rate is reduced, the refrigerant absorbs less heat, which is conducive to increasing the first actual superheat. The first actual superheat gradually approaches the target superheat of the cab, which can accurately control the actual temperature in the cab and improve the cooling efficiency.

[0132] Figure 8 An exemplary embodiment of the present application provides a flow chart of adjusting the opening of the second electronic expansion valve according to the target superheat of the battery and the second actual superheat. Figure 8 As shown, step S244 may include:

[0133] S2441: If the second actual superheat is greater than the target battery superheat, increase the opening of the second electronic expansion valve.

[0134] Similar to the execution process of step S2431, if the second actual superheat is greater than the target superheat of the battery, the flow rate of the refrigerant can be increased by increasing the opening of the second electronic expansion valve. The refrigerant with increased flow rate can absorb more heat, which is beneficial to reducing the second actual superheat. The second actual superheat gradually approaches the target superheat of the battery, which can accurately control the actual temperature inside the battery and improve the cooling efficiency.

[0135] S2442: If the second actual superheat is less than or equal to the target superheat of the battery, reduce the opening of the second electronic expansion valve.

[0136] Similar to the execution process of step S2432, if the second actual superheat is less than or equal to the battery target superheat, the flow rate of the refrigerant can be reduced by reducing the opening of the second electronic expansion valve. After the flow rate is reduced, the refrigerant absorbs less heat, which is beneficial to improving the second actual superheat. The second actual superheat gradually approaches the battery target superheat, which can accurately control the actual temperature inside the battery and improve the cooling efficiency.

[0137] Figure 9 A flowchart of a refrigeration control method is provided for another exemplary embodiment of the present application. As shown in FIG. 8, after step S220, the refrigeration control method further comprises: Figure 9

[0138] S250: obtaining a first rotating speed of the compressor according to the actual temperature in the cab and the first target temperature.

[0139] S260: obtaining a second rotating speed of the compressor according to the water-in temperature in the battery and the second target temperature.

[0140] S270: adjusting the actual rotating speed of the compressor to be the sum of the first rotating speed and the second rotating speed.

[0141] Specifically, in the process of executing step S250 and step S260, the corresponding first rotating speed and second rotating speed can be output according to the two sets of PID control systems. Then, in step S270, since the refrigerant output by the compressor needs to cool both the battery and the cab, the actual rotating speed of the compressor is adjusted to be the sum of the first rotating speed and the second rotating speed, so that each parameter (such as pressure, temperature, etc.) of the refrigerant output by the compressor can meet the cooling requirements of the battery and the cab at the same time.

[0142] It should be noted that before executing step S250 and step S260, the initial rotating speed of the compressor can be obtained, and a third time length during which the compressor operates at the initial rotating speed can be obtained. If the third time length is greater than a third preset time length threshold, it can be considered that the compressor is in an open working state, and then step S250, step S260 and step S270 are executed to adjust the actual rotating speed of the compressor.

[0143] In actual application, after executing step S210, if the refrigeration instruction represents that only the cab needs to be cooled, then step S250 can be executed to adjust the actual rotating speed of the compressor to be the first rotating speed. Similarly, if the refrigeration instruction represents that only the battery needs to be cooled, then step S260 can be executed to adjust the actual rotating speed of the compressor to be the second rotating speed.

[0144] Figure 10 A structure block diagram of a refrigeration control device is provided for an exemplary embodiment of the present application. As shown in FIG. 9, the refrigeration control device comprises: Figure 10 ​As shown, the refrigeration control device 400 provided by the embodiment of the present application can include: a first receiving module 410, configured to receive a refrigeration instruction; a first obtaining module 420, configured to obtain a first temperature difference and a second temperature difference if the refrigeration instruction indicates that the cab and the battery both need refrigeration; wherein the first temperature difference indicates a temperature difference between an actual temperature in the cab and a first target temperature; the second temperature difference indicates a temperature difference between a water inlet temperature in the battery and a second target temperature; a first output module 430, configured to output a priority demand instruction according to the first temperature difference and the second temperature difference; wherein the priority demand instruction includes that the refrigeration priority of the battery is higher than the refrigeration priority of the cab, or the refrigeration priority of the cab is not lower than the refrigeration priority of the battery; and a first adjusting module 440, configured to adjust the opening degree of the first electronic expansion valve and the second electronic expansion valve according to the priority demand instruction; wherein the first electronic expansion valve is used to adjust the flow of fluid flowing to the cab; and the second electronic expansion valve is used to adjust the flow of fluid flowing to the battery.

[0145] The refrigeration control device provided by the embodiment of the present application has the following advantages: first, the first temperature difference and the second temperature difference can be used to determine the degree of refrigeration demand of the cab and the battery, and the refrigeration priorities of the cab and the battery can be effectively determined; second, after the refrigeration priorities of the cab and the battery are determined, the opening degrees of the first electronic expansion valve and the second electronic expansion valve can be reasonably adjusted according to the priority demand instruction, so that the fluid flow to the cab and the fluid flow to the battery can be reasonably controlled, and the distribution results of the fluid flow by the first electronic valve and the second electronic valve can meet the priority demand instruction, thereby ensuring that the refrigeration amount distribution of the cab and the battery is more reasonable.

[0146] Figure 11 A structural block diagram of the refrigeration control device provided by another exemplary embodiment of the present application is shown in FIG. 4. Figure 11 As shown, in an embodiment, the first output module 430 includes a second output module 431, configured to output the priority demand instruction indicating that the refrigeration priority of the battery is higher than the refrigeration priority of the cab if the difference between the second temperature difference and the first temperature difference is greater than a preset threshold; and a third output module 432, configured to output the priority demand instruction indicating that the refrigeration priority of the cab is not lower than the refrigeration priority of the battery if the difference between the second temperature difference and the first temperature difference is less than or equal to the preset threshold.

[0147] As shown in FIG. 4, the refrigeration control device 400 provided by the embodiment of the present application can include: a first receiving module 410, configured to receive a refrigeration instruction; a first obtaining module 420, configured to obtain a first temperature difference and a second temperature difference if the refrigeration instruction indicates that the cab and the battery both need refrigeration; wherein the first temperature difference indicates a temperature difference between an actual temperature in the cab and a first target temperature; the second temperature difference indicates a temperature difference between a water inlet temperature in the battery and a second target temperature; a first output module 430, configured to output a priority demand instruction according to the first temperature difference and the second temperature difference; wherein the priority demand instruction includes that the refrigeration priority of the battery is higher than the refrigeration priority of the cab, or the refrigeration priority of the cab is not lower than the refrigeration priority of the battery; and a first adjusting module 440, configured to adjust the opening degree of the first electronic expansion valve and the second electronic expansion valve according to the priority demand instruction; wherein the first electronic expansion valve is used to adjust the flow of fluid flowing to the cab; and the second electronic expansion valve is used to adjust the flow of fluid flowing to the battery. Figure 11As shown in the figure, in an embodiment, the first adjusting module 440 comprises a second obtaining module 441 configured to obtain a target overheat degree of the cab and a target overheat degree of the battery according to the priority demand instruction; a third obtaining module 442 configured to obtain a first actual overheat degree of the cab and a second actual overheat degree of the battery; a second adjusting module 443 configured to adjust the opening degree of the first electronic expansion valve according to the target overheat degree of the cab and the first actual overheat degree; and a third adjusting module 444 configured to adjust the opening degree of the second electronic expansion valve according to the target overheat degree of the battery and the second actual overheat degree.

[0148] As shown in the figure, in an embodiment, the second obtaining module 441 comprises a first calculating module 4411 configured to, if the priority demand instruction represents that the refrigeration priority of the cab is not lower than the refrigeration priority of the battery, set the target overheat degree of the battery equal to the target overheat degree of the cab, a second temperature difference, and a preset correction factor. Figure 11

[0149] As shown in the figure, in an embodiment, the second obtaining module 441 comprises a second calculating module 4412 configured to, if the priority demand instruction represents that the refrigeration priority of the battery is higher than the refrigeration priority of the cab, set the target overheat degree of the cab equal to the target overheat degree of the battery, a first temperature difference, and a preset correction factor. Figure 11

[0150] As shown in the figure, in an embodiment, the second adjusting module 443 comprises a fourth adjusting module 4431 configured to, if the first actual overheat degree is greater than the target overheat degree of the cab, increase the opening degree of the first electronic expansion valve; and a fifth adjusting module 4432 configured to, if the first actual overheat degree is less than or equal to the target overheat degree of the cab, decrease the opening degree of the first electronic expansion valve. Figure 11

[0151] As shown in the figure, in an embodiment, the third adjusting module 444 comprises a sixth adjusting module 4441 configured to, if the second actual overheat degree is greater than the target overheat degree of the battery, increase the opening degree of the second electronic expansion valve; and a seventh adjusting module 4442 configured to, if the second actual overheat degree is less than or equal to the target overheat degree of the battery, decrease the opening degree of the second electronic expansion valve. Figure 11

[0152] As shown in the figure, in an embodiment, the refrigeration control device 400 can comprise a fourth obtaining module 450 configured to obtain a first rotation speed of the compressor according to the actual temperature in the cab and the first target temperature; a fifth obtaining module 460 configured to obtain a second rotation speed of the compressor according to the water inlet temperature in the battery and the second target temperature; and an eighth adjusting module 470 configured to adjust the actual rotation speed of the compressor to be the sum of the first rotation speed and the second rotation speed. Figure 11

[0153] Figure 12 ​​​​​A structural block diagram of an engineering machine is provided for an exemplary embodiment of the present application. As shown in Figure 12 The engineering machine 600 provided by the embodiment of the present application can include a machine body 610, a first electronic expansion valve 620, a second electronic expansion valve 630, and the refrigeration control device 400 as described in the foregoing embodiment, the machine body 610 is provided with a cab and a battery, the first electronic expansion valve 620 is used to adjust the flow of fluid flowing to the cab, the second electronic expansion valve 630 is used to adjust the flow of fluid flowing to the battery, and the refrigeration control device 400 is communicatively connected to the first electronic expansion valve 620 and the second electronic expansion valve 630.

[0154] The engineering machine 600 provided by the embodiment of the present application includes the refrigeration control device 400 as described in the foregoing embodiment, and has all the functions and beneficial effects of the refrigeration control device 400.

[0155] In an embodiment, the engineering machine 600 can include a crane, a shovel, etc.

[0156] Figure 13 A structural block diagram of an electronic device is provided for an exemplary embodiment of the present application. As shown in Figure 13 The electronic device 800 provided by the embodiment of the present application can include a processor 810 and a memory 820 for storing executable instructions of the processor 810, wherein the processor 810 is configured to perform the refrigeration control method described in the foregoing embodiments.

[0157] The processor 810 can be a central processing unit (CPU) or other forms of processing units having data processing and / or instruction execution capabilities, and can control other components in the electronic device 800 to perform desired functions.

[0158] The memory 820 can include one or more computer program products, which can include various forms of computer readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory can include, for example, random access memory (RAM), cache memory, and / or the like. The non-volatile memory can include, for example, read-only memory (ROM), hard disk, flash memory, and / or the like. One or more computer program instructions can be stored on the computer readable storage media, and the processor 810 can run the program instructions to implement the control method of the embodiments of the present application described above and / or other desired functions. Various contents such as input signals, signal components, noise components, and the like can also be stored in the computer readable storage media.

[0159] In one example, the electronic device 800 can further include an input device 830 and an output device 840, which are interconnected to each other through a bus system and / or other forms of connection mechanisms (not shown).

[0160] When the electronic device 800 is a stand-alone device, the input device 830 can be a communication network connector for receiving the acquired input signals from the first device and the second device.

[0161] In addition, the input device 830 can further include, for example, a keyboard, a mouse, and the like.

[0162] The output device 840 can output various information, including the determined distance information, direction information, and the like, to the outside. The output device 840 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0163] Of course, in order to simplify, Figure 13 In the FIG. 8, only some of the components of the electronic device 800 related to the present application are shown, and components such as a bus, an input / output interface, and the like are omitted. In addition thereto, the electronic device 800 can further include any other appropriate components according to a specific application.

[0164] The computer program product can be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++, etc., and conventional procedural programming languages, such as the "C" programming language, or the like. The program code can execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's device and partly on a remote computing device or entirely on the remote cloud device or server.

[0165] The computer readable storage medium can be a combination of one or more computer readable media. The computer readable media can be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can include, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium include an electrical connection having one or more wires, a portable disc, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0166] The above describes the basic principles of the present application in combination with specific embodiments, but it needs to be pointed out that the advantages, benefits, effects and the like mentioned in the present application are only examples and are not limiting, and these advantages, benefits, effects and the like cannot be considered as necessary for each embodiment of the present application. In addition, the above specific details disclosed are only for the purpose of example and understanding, and are not limiting, and the above details do not limit the present application to be necessarily implemented with the above specific details.

[0167] The block diagrams of the devices, apparatuses, equipment, systems involved in the present application are only illustrative examples and are not intended to require or imply the connection, arrangement, configuration shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, systems can be connected, arranged, configured in any manner. Words such as "include", "contain", "have" and the like are open-ended words, mean "including but not limited to", and can be used interchangeably. The words "or" and "and" used herein mean the word "and / or", and can be used interchangeably unless the context clearly indicates otherwise. The word "such as" used herein means the phrase "such as but not limited to", and can be used interchangeably.

[0168] It also needs to be pointed out that in the devices, equipment and methods of the present application, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions of the present application.

[0169] The above description of the disclosed aspects is provided so that any person skilled in the art can make or use the present application. Various modifications to these aspects will be apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0170] The above description has been given for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A refrigeration control method, characterized in that: include: Receive cooling instructions; If the cooling instruction indicates that both the cab and the battery need to be cooled, obtaining a first temperature difference and a second temperature difference; wherein the first temperature difference indicates the temperature difference between the actual temperature in the cab and a first target temperature; and the second temperature difference indicates the temperature difference between the water inlet temperature in the battery and a second target temperature. Outputting a priority demand instruction based on the first temperature difference and the second temperature difference; wherein the priority demand instruction includes that the cooling priority of the battery is higher than the cooling priority of the cab, or that the cooling priority of the cab is not lower than the cooling priority of the battery; According to the priority demand instruction, adjusting the opening of the first electronic expansion valve and the second electronic expansion valve; wherein the first electronic expansion valve is used to adjust the flow rate of the fluid flowing to the cab; the second electronic expansion valve is used to adjust the flow rate of the fluid flowing to the battery; Wherein, adjusting the openings of the first electronic expansion valve and the second electronic expansion valve according to the priority demand instruction includes: Obtaining a cab target overheat and a battery target overheat according to the priority demand instruction; obtaining a first actual overheat degree of the cab and a second actual overheat degree of the battery; adjusting the opening of the first electronic expansion valve according to the target superheat degree of the cab and the first actual superheat degree; The opening degree of the second electronic expansion valve is adjusted according to the target battery superheat and the second actual superheat.

2. The refrigeration control method according to claim 1, characterized in that: Outputting a priority demand instruction according to the first temperature difference and the second temperature difference includes: If the difference between the second temperature difference and the first temperature difference is greater than a preset threshold, outputting a priority demand instruction indicating that the cooling priority of the battery is higher than the cooling priority of the cab; If the difference between the second temperature difference and the first temperature difference is less than or equal to the preset threshold, a priority demand instruction is outputted, indicating that the cooling priority of the cab is not lower than the cooling priority of the battery.

3. The refrigeration control method according to claim 1, wherein: The obtaining of the target cab overheat and the target battery overheat according to the priority demand instruction includes: If the priority demand instruction indicates that the cooling priority of the cab is not lower than the cooling priority of the battery, the battery target superheat is set equal to the sum of the cab target superheat, the second temperature difference, and a preset modification factor.

4. The refrigeration control method according to claim 1, wherein: Obtaining a target battery overheat and a target cab overheat according to the priority demand instruction includes: If the priority demand instruction indicates that the cooling priority of the battery is higher than the cooling priority of the cab, the target superheat degree of the cab is set equal to the sum of the target superheat degree of the battery, the first temperature difference, and a preset correction factor.

5. The refrigeration control method according to claim 1, wherein: The adjusting the opening of the first electronic expansion valve according to the target superheat of the cab and the first actual superheat includes: If the first actual superheat is greater than the target cab superheat, increasing the opening of the first electronic expansion valve; If the first actual superheat degree is less than or equal to the target superheat degree of the cab, the opening degree of the first electronic expansion valve is reduced.

6. The refrigeration control method according to claim 1, wherein: The adjusting the opening of the second electronic expansion valve according to the target battery superheat and the second actual superheat includes: If the second actual superheat is greater than the battery target superheat, increasing the opening of the second electronic expansion valve; If the second actual superheat is less than or equal to the battery target superheat, the opening of the second electronic expansion valve is reduced.

7. The refrigeration control method according to claim 1, wherein: After obtaining the first temperature difference and the second temperature difference, the refrigeration control method further includes: obtaining a first speed of the compressor according to the actual temperature in the cab and the first target temperature; obtaining a second speed of the compressor according to an inlet water temperature in the battery and the second target temperature; The actual speed of the compressor is adjusted to the sum of the first speed and the second speed.

8. A refrigeration control device, characterized in that: include: A first receiving module, configured to receive a cooling instruction; a first acquisition module configured to acquire a first temperature difference and a second temperature difference if the cooling instruction indicates that both the cab and the battery require cooling; wherein the first temperature difference indicates a temperature difference between an actual temperature in the cab and a first target temperature; and the second temperature difference indicates a temperature difference between an inlet water temperature in the battery and a second target temperature; a first output module, configured to output a priority demand instruction based on the first temperature difference and the second temperature difference; wherein the priority demand instruction includes that the cooling priority of the battery is higher than the cooling priority of the cab, or that the cooling priority of the cab is not lower than the cooling priority of the battery; a first adjustment module, configured to adjust the openings of a first electronic expansion valve and a second electronic expansion valve according to the priority demand instruction; wherein the first electronic expansion valve is configured to adjust the flow rate of the fluid flowing to the cab; and the second electronic expansion valve is configured to adjust the flow rate of the fluid flowing to the battery; The first adjustment module includes: a second acquisition module, obtaining a cab target overheat degree and a battery target overheat degree according to the priority demand instruction; a third acquisition module, acquiring a first actual overheat degree of the cab and a second actual overheat degree of the battery; a second adjustment module, adjusting the opening of the first electronic expansion valve according to the target superheat degree of the cab and the first actual superheat degree; The third adjustment module adjusts the opening of the second electronic expansion valve according to the target superheat of the battery and the second actual superheat.

9. An engineering machine, characterized in that: include: the body, which houses the cab and batteries; a first electronic expansion valve, configured to adjust the flow of fluid flowing to the cab; a second electronic expansion valve, configured to adjust the flow of fluid flowing to the battery; The refrigeration control device according to claim 8, wherein the first electronic expansion valve and the second electronic expansion valve are communicatively connected.

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