Refrigerating capacity distribution method and system

Abstract

The invention belongs to the technical field of logic control, and particularly discloses a refrigerating capacity distribution method which comprises the following steps: acquiring refrigerating requirements of a passenger compartment and a battery, executing a first logic if the passenger compartment has no refrigerating requirement and the battery has the refrigerating requirement, and executing a second logic if both the passenger compartment and the battery have the refrigerating requirement; the first logic comprises the steps that the refrigerant superheat degree is obtained, and the opening degree of the electronic expansion valve is controlled through a PID algorithm; the second logic comprises the steps that the battery working temperature is obtained, and the opening degree of the electronic expansion valve is obtained in combination with the preset battery working temperature-electronic expansion valve opening degree mapping relation. The invention further discloses a control system for the electronic expansion valve of the extended-range electric vehicle. The control system comprises a monitoring unit, a first cooling request unit, a second cooling request unit and a control unit. According to the scheme, a forced control scheme is reasonably set, serious overshoot of system control is avoided, meanwhile, the refrigerating capacity distribution is finely controlled, and the refrigerating requirements of the battery in different working conditions are better met.

Description

technical field [0001] The invention belongs to the technical field of logic control, and in particular relates to a cooling capacity distribution method and system. Background technique [0002] In the extended-range electric vehicle, the cooling schemes of the power battery mainly include natural cooling, forced air cooling and water cooling. Among them, the water cooling solution has the highest cost, the most complex structure, and superior performance, making it the mainstream cooling solution in the industry. In the water cooling scheme, the refrigeration of the electric compressor and the heat exchange of the battery are generally used to achieve the purpose of cooling. Among them, the control of the electronic expansion valve, a key component, is the key to determining the cooling of the battery. [0003] The control of the electronic expansion valve needs to meet the cooling demand of the battery and control the stability of the air conditioning system when the ba...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a cooling capacity distribution method and system to solve the problems that the existing electronic expansion valve control scheme cannot adapt to all working conditions, resulting in unstable cooling of the battery and poor cooling effect of the passenger compartment.

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