Heat pump system for vehicle and method of controlling the same

Abstract

A heat pump system for a vehicle may include a cooling apparatus that supplies and circulates coolant to a motor and an electrical equipment through a cooling line, wherein the cooling apparatus includes a radiator, a cooling fan that ventilates wind to the radiator, and a water pump connected to the cooling line, and an air conditioner apparatus connected through a refrigerant line, wherein the air conditioner apparatus includes a water-cooled condenser connected to the cooling line to change a temperature of the coolant using a waste heat that has occurred in the motor and the electrical equipment according to each mode of the vehicle and that is connected to the refrigerant line to enable an injected refrigerant in the refrigerant line to exchange a heat with the coolant at the inside thereof, and an air-cooled condenser connected in series to the water-cooled condenser through the refrigerant line.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present application claims priority to Korean Patent Application No. 10-2012-0099535 filed on Sep. 7, 2012, the entire contents of which is incorporated herein for all purposes by this reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a heat pump system for a vehicle and a method of controlling the same that simultaneously use a water heat source and an air heat source and that improve a heating performance and a dehumidification performance using a waste heat occurring in a motor and an electrical equipment.[0004]2. Description of Related Art[0005]In general, an air-conditioning apparatus for a vehicle includes an air conditioner module for heating and air conditioning indoors of the vehicle.[0006]In such an air conditioner module, a heat exchange medium that is ejected by driving of a compressor circulates again to the compressor via a condenser, a receiver drier, an expansion ...

AI Technical Summary

Benefits of technology

The present invention is about a heat pump system for vehicles that uses both water and air as heat sources, improves heating and dehumidification performance, and prevents external frost on the vehicle's condenser in extreme cold conditions. The system also reduces the heating load on the vehicle, allowing it to travel longer distances with the same power.

Problems solved by technology

However, as described above, as a structure of a compressor, a heat exchanger, and each constituent element becomes complicated, there is a problem that entire system package becomes complicated.

Further, as surface freezing occurs at an external condenser at a winter season, heat exchange efficiency, a heating performance, and efficiency of a heat exchange medium are deteriorated, and when an air conditioning mode is converted to a heating mode, humidity increases by condensation water remaining at the outside of an evaporator, and thus windowpanes of the vehicle are steamed up.

In a defrost mode that removes surface freezing of an external condenser in order to prevent this problem, operation of a compressor is stopped and heating should be performed with only a PTC heater, and thus while a heating performance is extremely deteriorated, when a heating load increases according to increase of a power use amount and the vehicle drives while heating, there is a problem that a travel distance is shortened.

Further, when an outdoor temperature is low, a heating performance is remarkably low and a system is unstable, and when a liquid refrigerant is injected into the compressor, durability of the compressor is deteriorated.

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