Vehicular air-conditioning system and control method of same
First Claim
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;
whereinthe 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.
1 Assignment
0 Petitions
Accused Products
Abstract
An air-conditioner ECU sets the maximum flowrate or a set flowrate which is less than the maximum flowrate as a required flowrate Vr based on outside air temperature when a DEF mode is selected, and requires that coolant be circulated (steps 100 to 110). Also, when the coolant temperature Tw during heating is between a set temperature TS3 and a set temperature TS1, circulation of coolant at the minimum flowrate is required (steps 134, 130, 132). When a blower fan is stopped when the coolant temperature is equal to or less than the set temperature TS3 and a fresh air mode is selected, the circulation of coolant at the minimum flowrate is required when the vehicle speed Sv is above a set vehicle speed (steps 134 to 146). Cool air is prevented from being blown out of an air outlet and heating of the coolant is promoted by suppressing the speed of an electric pump while maintaining the ability to prevent fogging.
29 Citations
7 Claims
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1. A control method of an air-conditioning system for a vehicle that includes:
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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;
whereinthe 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.
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2. An air-conditioning system provided for a vehicle that includes:
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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 drives the electric pump at a speed according to a required flowrate that is input when a flowrate is required; 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 air-conditioning system further comprising; a blower fan that is driven to produce the supply air; a coolant temperature detecting device that detects a temperature of the coolant; an air-conditioning controlling device that; controls operation of the blower fan and air-conditions the vehicle cabin with supply air produced by controlling the amount of air heated by the heater core, and stops operation of the blower fan when the temperature of the coolant detected by the coolant temperature detecting device is equal to or less than a set temperature during heating; sets the required flowrate of the coolant that is circulated to the heater core; and requires the engine controlling device to circulate the coolant of the required flowrate when the required flowrate has been set; and a vehicle speed detecting device that detects a vehicle speed; wherein the air-conditioning system is configured such that when the air-conditioning controlling device stops the blower fan because the temperature of the coolant is less than the set temperature an when the vehicle speed detecting device detects that the vehicle speed exceeds preset speed, the air-conditioning controlling device sets the required flowrate of the coolant based on the vehicle speed; and wherein when the air-conditioning controlling device stops the blower fan because the temperature of the coolant is less than the set temperature and when the vehicle speed detecting device detects that the vehicle speed is equal to or less than the preset speed, the required flowrate is set to 0. - View Dependent Claims (3, 4, 5, 6, 7)
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Specification