Duty control effect during crankcase flow in automobile ECV at its crankcase pressure port

摘要

Electromagnetic control valve; widely known as ECV, is one of the important components used in variable displacement type compressor for air conditioning control system. It controls the compressor operation on the basis of pulse width modulation (PWM) technique that used to encode the information for transmission. PWM technique allows the control of the power supplied from an external controller to the electrical devices, especially to inertial loads. Different pressure ports in ECV, basically acts as the connecting passages through the ECV for air/refrigerant flow functions. Supply of current and duty control is an important issue that highly concerns to the crankcase flow (Pc flow) through the crankcase pressure port of the ECV. In this research paper, effect of duty control is investigated during the Pc flow at the crankcase pressure port of ECV.