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A vehicle heat pump system capable of improving cooling and heating performance by applying a gas injection device selectively operated in a vehicle interior air conditioning mode to increase the flow rate of refrigerant. The heat pump system uses a single heat exchanger configured to exchange heat between at least two refrigerants having different temperatures and states with each other for the entire system and the gas injection device, so that the total number of components can be reduced, and manufacturing costs and weight can also be reduced.

Disclosed is a heat pump system for a vehicle, which is capable of improving cooling and heating performance by applying a gas injection device that selectively operates in a vehicle interior air conditioning mode to increase the flow rate of refrigerant. The heat pump system includes a compressor, a condenser, a first expansion valve, an evaporator, a first connection line, a cooler, a second expansion valve, a sub heat exchanger, and a gas injection device, wherein the flow rate of refrigerant is controlled by operation control of the gas injection device according to at least one mode for adjusting the temperature of the vehicle interior.

The invention relates to a keyword searching method and device, computer equipment, a computer readable storage medium and a computer program product. The method comprises the steps that an initial prefix tree is constructed based on entries, each node of the initial prefix tree corresponds to one prefix, and the entries are recorded on the nodes, the same as the entries, of the corresponding prefixes; for each non-leaf node, at most a target number of entries are screened out from the entries recorded on the node on the path from the non-leaf node to the leaf node according to the weight scores of the entries, and a heap structure corresponding to the non-leaf node is constructed according to the target number of entries; when the number of the entries in the heap structure corresponding to the non-leaf nodes is smaller than the target number, the non-leaf nodes and child nodes under the non-leaf nodes are combined to obtain a target prefix tree which is used for traversing target nodes matched with the keywords in the search scene, the entries are determined from the corresponding heap structure to serve as associative words of the keywords, and the associative words of the keywords are obtained. The indexing efficiency can be improved, and meanwhile storage space occupation can be reduced.