Electric excavator thermal management system and control method thereof

Abstract

The invention discloses an electric excavator thermal management system and a control method thereof. Comprising a heat pump loop, a WPTC loop and a battery pack loop. A liquid accumulator in the heat pump loop is divided into two paths, the first path is connected with an air supply inlet of the electric compressor through a third electromagnetic valve, a first electronic expansion valve and an economizer, and the second path is connected back to an inlet of the electric compressor through the economizer, a heat exchanger and the like; the WPTC loop comprises a first water pump and a heater WPTC; the battery pack loop is divided into two paths through a fifth electromagnetic valve, one path is connected with the low-temperature radiator, and the other path is connected with the heat exchanger. Medium-pressure air supplement of the compressor is achieved by introducing the economizer, the mass flow of the outdoor heat exchanger is increased, and the battery pack cooling effect and the cab refrigeration effect are balanced through the electronic expansion valve; during heating, waste heat of the battery pack is introduced into the cab to achieve heating of the cab. The heating and refrigerating efficiency of the electric excavator is improved, energy consumption is reduced, and the continuous operation time of the whole excavator is prolonged.

Description

Technical field [0001] The present invention relates to the technical field of electric excavators. Specifically, it relates to a thermal management system and a control method for an electric excavator. Background technique [0002] As the promotion and application of electrification of construction machinery continues to increase, the demand for continuous operation time of the complete machine is becoming more and more urgent. Since the air conditioning system is a key energy-consuming component of electric vehicles, its thermal management solution has become particularly important for overall machine energy consumption distribution and improvement of operational reliability. [0003] The shortcomings of the existing electric excavator air conditioning thermal management system are: [0004] (1) The cab refrigeration and battery pack cooling share a compressor, which requires very high performance of the compressor and seriously affects the operating reliability of the c...

AI Technical Summary

Problems solved by technology

[0004] (1) The cab cooling and the battery pack cooling share a compressor, which has very high performance requirements on the compressor, which seriously affects the operation reliability of the compressor;

[0005] (2) The cab is mostly heated by heat pump or high-pressure PTC, and the heat utilization rate of the heat pump system is low in low temperature environment, and the heating capacity cannot meet the requirements; while the PTC heating scheme has high heating efficiency, but consumes a lot of energy , the cost is high, and it will reduce the continuous running time of the electric excavator;

[0006] (2) The cab heating and battery pack cooling modes are relatively single and independent of each other, which cannot achieve the effect of battery pack waste heat recovery and synchronous adjustment of battery pack cooling and cab heating

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