CN-121993992-A - Quick cooling control method and system for vehicle-mounted refrigerator

CN121993992ACN 121993992 ACN121993992 ACN 121993992ACN-121993992-A

Abstract

The invention discloses a rapid cooling control method and a rapid cooling control system for a vehicle-mounted refrigerator, and relates to the technical field of compressor-type vehicle-mounted refrigerator refrigeration. The method realizes high-efficiency cooling through stage control, namely after the system is initialized, the system enters a full-load temperature pulling stage when the initial temperature is higher than a stage switching threshold value, the compressor, the electronic expansion valve and the fan are operated with maximum parameters to quickly cool, after the temperature reaches the standard, the system is switched to a constant temperature difference closed-loop control and convection wind speed linkage adjustment stage, the heat exchange temperature difference between an article and an evaporator is used as a controlled object, the rotating speed of the compressor and the opening of the expansion valve are dynamically adjusted by a PID algorithm, the wind speed of the fan is regulated and controlled in sections according to the temperature difference, and after the temperature approaches a target value, the system is switched to a steady-state PID temperature control, and the target temperature is accurately maintained. The system comprises a main control module, a temperature acquisition module, a compressor module, an electronic expansion valve module, a convection fan module and the like, does not need to greatly change hardware, and can be compatible with a mainstream vehicle-mounted refrigerator. The invention gives consideration to the cooling rate, the temperature control precision and the energy consumption, and is suitable for the refrigeration requirement of vehicle-mounted multiple scenes.

Inventors

SHI JIEJUN
HE FENG
LUO SHAOHUI
GUO YAN
LIN SHENGMIAO
HUANG ZAIWEI

Assignees

英得尔实业(广东)股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260318

Claims (10)

1. A rapid cooling control method of a vehicle-mounted refrigerator comprises a system for realizing the control method, a main control module, a temperature acquisition module, a compressor, an evaporator, an electronic expansion valve for adjusting the flow of a refrigerant and a convection fan; the method is characterized by comprising the following steps of: The method comprises the following steps of S1, completing hardware self-checking and parameter initialization by system power-on, obtaining target refrigeration temperature Ts set by a user, and pre-storing core control parameters by a main control module, wherein the core control parameters at least comprise a phase switching threshold temperature Tth, a constant heat exchange temperature difference set value delta Tset between the real-time temperature of an object to be refrigerated and the temperature of an evaporator, a maximum allowable operation parameter of a compressor and a convection fan wind speed adjustment interval; S2, the temperature acquisition module acquires real-time temperature T of an article to be refrigerated in the vehicle-mounted refrigerator in real time, if the initial real-time temperature T0 is larger than Tth, the main control module controls the compressor to continuously operate with maximum allowable operation parameters, and the convection fan to operate with preset initial maximum wind speed until the real-time temperature T is smaller than or equal to Tth, and the S3 is triggered; s3, synchronous execution of constant temperature difference closed-loop control and linkage adjustment of convection wind speed are included; the main control module is used for adjusting the running rotating speed of the compressor and the opening of the electronic expansion valve so that the real-time temperature difference delta T is in a preset allowable fluctuation interval of delta Tset; And the main control module is used for linearly or sectionally adjusting the running rotating speed of the convection fan based on the real-time temperature difference delta T.
2. The method according to claim 1, wherein in the step S2, the core control parameter further includes a phase switching hysteresis interval Tth ', the phase switching hysteresis interval Tth' e [ Tth, tth+x°c ], the 1 is less than or equal to x is less than or equal to 3, and when the real-time temperature T fluctuates in the phase switching hysteresis interval, the phase switching action is not executed.
3. The method according to claim 1, wherein in the constant temperature difference closed-loop control in the step S3, the preset allowable interval of Δtset is Δtset ', Δtset' e [ Δtset-y ℃, Δtset+y ], and y is equal to or less than 0.5 and equal to or less than 1.5.
4. The method for rapidly cooling a vehicle-mounted refrigerator according to claim 1, wherein in the step S3, the temperature acquisition module can acquire the real-time evaporation temperature Te of the evaporator, the main control module takes the real-time heat exchange temperature difference T-Te between the real-time temperature T of the object to be cooled and the real-time evaporation temperature Te of the evaporator as a direct controlled object, and the actual heat exchange temperature difference T-Te of the controlled object is within a preset allowable range of the constant heat exchange temperature difference set value Δtset by controlling the running speed of the compressor and the opening of the electronic expansion valve.
5. The method for rapidly cooling the vehicle-mounted refrigerator according to claim 3, wherein in the step S3, the main control module adjusts the operation speed of the compressor and the opening of the electronic expansion valve by adopting an incremental PID closed-loop algorithm, specifically: When delta T is larger than delta Tset+y ℃, the main control module increases the running rotating speed of the compressor in proportion, increases the opening of the electronic expansion valve and increases the refrigerating output; When DeltaT is less than DeltaTset-y ℃, the main control module reduces the running rotating speed of the compressor proportionally, reduces the opening of the electronic expansion valve and reduces the refrigerating output; When Δt is at Δtset', the main control module maintains the current operating states of the compressor and the electronic expansion valve.
6. The method for controlling rapid cooling of a vehicle-mounted refrigerator according to claim 3, wherein in S3, the convection wind speed linkage adjustment is specifically: when the delta T is more than or equal to Tth-z ℃, the convection fan operates at a preset initial maximum wind speed; When the delta Tset and the y ℃ are less than or equal to delta T < Tth-z ℃, the convection fan operates at the maximum rated wind speed of A%; When the delta Tset-yDEG C is less than or equal to delta T < delta Tset+yDEG C, the convection fan operates at a maximum rated wind speed of B%; when delta T is less than or equal to delta Tset-y ℃, the convection fan operates at a C% maximum rated wind speed; 0<z is less than or equal to 1; the ratio of C to B to A is less than or equal to 80.
7. The method for rapid cooling control of a vehicle-mounted refrigerator according to claim 1, wherein in the step S2, if the initial real-time temperature T0 is less than or equal to Tth, the system directly proceeds to the step S3.
8. The method for controlling rapid cooling of a vehicle-mounted refrigerator according to claim 1, wherein in S1, the maximum allowable operation parameters of the compressor include a maximum rated rotation speed of the compressor, a maximum working current, and a maximum adaptive opening of an electronic expansion valve; In the step S2, the continuous operation of the compressor with the maximum allowable operation parameter includes the operation of the compressor with the maximum rated rotation speed and the operation of the electronic expansion valve matched with the opening corresponding to the maximum refrigerating capacity.
9. The method for controlling the rapid cooling of the vehicle-mounted refrigerator according to claim 1, further comprising the step S4 of exiting the rapid cooling control mode of the vehicle-mounted refrigerator when the real-time temperature T is less than or equal to Ts+x1 ℃, and controlling the temperature in the vehicle-mounted refrigerator to be stably at a target cooling temperature Ts, wherein x1 is less than or equal to 0 and less than or equal to 2.
10. The vehicle-mounted refrigerator rapid cooling control system is characterized by further comprising a compressor driving module, an electronic expansion valve driving module and a convection fan driving module, wherein the vehicle-mounted refrigerator rapid cooling control system is used for executing the vehicle-mounted refrigerator rapid cooling control method according to any one of claims 1-9; The main control module is used for finishing system initialization, parameter storage, logic judgment and control operation, and outputting driving control signals to the compressor driving module, the electronic expansion valve driving module and the convection fan driving module; The compressor driving module is used for receiving a control signal of the main control module and steplessly adjusting the running rotating speed and the working current of the compressor; The electronic expansion valve driving module is used for receiving the control signal of the main control module, adjusting the opening of the electronic expansion valve through the stepping motor and controlling the circulation flow of the refrigerant; the convection fan driving module is used for receiving the control signal of the main control module and steplessly adjusting the running rotating speed of the convection fan.

Description

Quick cooling control method and system for vehicle-mounted refrigerator Technical Field The invention relates to the technical field of vehicle-mounted refrigeration equipment, in particular to a compressor-type vehicle-mounted refrigerator rapid cooling control method and an adaptive control system. Background The core performance indexes of the vehicle-mounted refrigerator comprise cooling rate, temperature control precision, operation energy consumption and system stability, wherein the cooling rate directly influences the use experience of a user, and particularly in a high-temperature vehicle-mounted environment in summer. The conventional PID closed-loop temperature control scheme is generally adopted in the refrigeration control technology of the existing vehicle-mounted refrigerator, namely, the target temperature in the refrigerator is used as a controlled object, and the running parameters of the compressor are regulated in real time through a PID algorithm, so that the control of the temperature in the refrigerator is realized. However, in the large-span cooling scene from room temperature to target low temperature, the output power of the compressor is gradually reduced along with the temperature difference, and the refrigerating capacity of the system cannot be fully utilized, so that the waiting time for cooling from room temperature to target refrigerating temperature is longer. In addition, the vehicle-mounted refrigerator adopts a full-load operation temperature control scheme, the scheme is to increase the cooling speed, the compressor is controlled to continuously operate in a higher load state in the whole cooling process, the target temperature of the evaporator and the air speed of the convection fan are not linked, and the mode is single. The temperature difference between the temperature of the object to be refrigerated and the target temperature of the evaporator is greatly reduced in the middle and later stages of cooling, the heat exchange temperature difference between the object to be refrigerated and the evaporator is synchronously reduced, the convection heat exchange efficiency is rapidly reduced, the cooling rate cannot be effectively improved even if the compressor continuously runs at full load, meanwhile, the energy waste is caused by the long-term expiration load operation of the compressor, the failure is easy to occur, the service life of equipment is shortened, the noise is larger, the convection air speed of the heat exchange end is not cooperatively regulated, the heat exchange efficiency bottleneck under the working condition of small temperature difference exists, and the cooling rate is limited. Disclosure of Invention In view of the above, the invention aims to provide a rapid cooling control method and a rapid cooling control system for a vehicle-mounted refrigerator, which have the advantages of high cooling efficiency, good temperature control precision and low operation energy consumption, and are suitable for a main flow compressor type vehicle-mounted refrigerator. The invention adopts the technical proposal for solving the technical problems that: a rapid cooling control method of a vehicle-mounted refrigerator comprises a system for realizing the control method, a main control module, a temperature acquisition module, a compressor, an evaporator, an electronic expansion valve for adjusting the flow of a refrigerant and a convection fan; The quick cooling control method of the vehicle-mounted refrigerator comprises the following steps: The method comprises the following steps of S1, completing hardware self-checking and parameter initialization by system power-on, obtaining target refrigeration temperature Ts set by a user, and pre-storing core control parameters by a main control module, wherein the core control parameters at least comprise a phase switching threshold temperature Tth, a constant heat exchange temperature difference set value delta Tset between the real-time temperature of an object to be refrigerated and the temperature of an evaporator, a maximum allowable operation parameter of a compressor and a convection fan wind speed adjustment interval; S2, the temperature acquisition module acquires real-time temperature T of an article to be refrigerated in the vehicle-mounted refrigerator in real time, if the initial real-time temperature T0 is larger than Tth, the main control module controls the compressor to continuously operate with maximum allowable operation parameters, and the convection fan to operate with preset initial maximum wind speed until the real-time temperature T is smaller than or equal to Tth, and the S3 is triggered; s3, synchronous execution of constant temperature difference closed-loop control and linkage adjustment of convection wind speed are included; the main control module is used for adjusting the running rotating speed of the compressor and the opening of the electronic expansion valve so that the real-time temp