An automobile air conditioning system

By utilizing engine waste heat to drive the refrigeration system and replacing the engine-driven compressor with an expander, the problem of high power consumption in the air conditioning system of fuel vehicles is solved, achieving significant energy-saving effects and engine water temperature control, especially at idle or low speeds.

CN122323736APending Publication Date: 2026-07-03BEIJING YONG HUI YANG ENERGY SCI TECH DEVCO
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING YONG HUI YANG ENERGY SCI TECH DEVCO
Filing Date
2026-04-30
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing air conditioning systems in gasoline vehicles use the engine to provide mechanical power to drive the compressor, resulting in high power consumption, especially at idle or low speeds where fuel consumption increases significantly, and the engine coolant temperature is prone to rise.

Method used

The system uses engine waste heat to drive the refrigeration system, which uses an expander to drive the compressor instead of the engine. The heat distribution is controlled by a diversion valve to achieve mechanical transmission isolation between the engine and the air conditioning compressor, and the heat from the engine cooling working fluid is used to provide energy for the expander.

Benefits of technology

It reduces engine power consumption and saves energy used by the engine for air conditioning, especially at idle or low speeds, avoiding the problem of engine coolant temperature rise and achieving energy savings of 5% to 20%.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention discloses an automotive air conditioning system, including an engine radiator, a water pump, and a thermostat; it also includes a distribution valve, a liquid refrigerant-heat exchanger, an expander, a condenser, an expansion valve, an evaporator, a compressor, and a refrigeration-side starter. Under normal operating conditions, the compressor is driven only by the expander; during system startup, the compressor is driven by the refrigeration-side starter. The liquid refrigerant from the engine is distributed by the distribution valve to the primary side of the liquid refrigerant-heat exchanger according to the heat demand of the secondary side of the heat exchanger. Then, it merges with another path from the distribution valve and returns to the engine via the engine radiator, water pump, and thermostat, forming a cycle. The refrigerant circulates in a loop formed by the compressor, the secondary side of the liquid refrigerant-heat exchanger, the expander, the condenser, the expansion valve, and the evaporator connected in sequence. The automotive air conditioning system of this invention uses an expander and the heat energy obtained from the primary liquid working fluid to generate power to drive the compressor, which is no longer driven by the engine. This not only reduces the power consumption of the engine, but also has a very considerable energy-saving effect, which can reach 5% to 20%. The energy-saving effect is even more prominent when idling and driving at low speeds.
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