PROCÉDÉ DE COMMANDE POUR SYSTÈME DE POMPE À CHALEUR ET SYSTÈME DE POMPE À CHALEUR

摘要

Provided are a control method of a heat pump system and a heat pump system. The heat pump system includes a throttling element and a four-way valve (3). The four-way valve (3) has a first state in a case that the heat pump system operates for refrigerating and a second state in a case that the heat pump system operates for heating. The control method includes that: before the four-way valve (3) is switched from the first state to the second state, A is compared with B, and switching of the state of the four-way valve is controlled and the opening degree of the throttling element (8) is adjusted according to the comparison result, or switching of the state of the four-way valve is controlled according to the comparison result, or the opening degree of the throttling element (8) is adjusted according to the comparison result. According to the control method of the heat pump system, when the four-way valve (3) needs to be reversed, according to the reversing pressure difference of the four-way valve (3) and the current system pressure difference B of the heat pump system, the four-way valve (3) and the throttling element (8) are controlled, and therefore problems of low-pressure protection caused by reversing the four-way valve (3), liquid entrainment of a compressor and the like can be effectively solved, and operating reliability of the heat pump system can be improved.