Patent ID: 8540166
Filing Date: 2013-09-24
Classification: B60H

Abstract:
1. A control method of an air-conditioning system for a vehicle that includes: an electric pump that circulates coolant at a flowrate according to a speed of the electric pump between an engine and a heater core; and an engine controlling device that controls starting/stopping of the electric pump, as well as the speed of the electric pump when the electric pump is being driven, based on a driving state of the engine, and driving the electric pump at a speed according to a required flowrate that is input when a flowrate is required; wherein the air-conditioning system performing air-conditioning by blowing supply air, which is produced by controlling an air-heating amount by the heater core through which the coolant is circulated, out into a vehicle cabin from an air outlet, the control method comprising: detecting a temperature of the coolant; controlling operation of a blower fan that is driven to produce the supply air; air-conditioning the vehicle cabin with supply air produced by controlling the amount of air heated by the heater core; stopping operation of the blower fan when the detected temperature of the coolant is equal to or less than a set temperature during heating; detecting a vehicle speed; determining whether vehicle speed exceeds a preset vehicle speed; setting the required flowrate of the coolant that is circulated to the heater core based on the detected vehicle speed when the blower fan is stopped because the temperature of the coolant has not reached the set temperature and when the vehicle speed exceeds the preset vehicle speed; setting the required flowrate of the coolant that is circulated to the heater core to 0 when the blower fan is stopped because the temperature of the coolant has not reached the set temperature and when the vehicle speed is equal to or less than the preset vehicle speed; and requiring the engine controlling device to circulate the coolant of the required flowrate when the required flowrate has been set.