AUTOMATED NO-IDLE HEATING AND ENGINE PRE-HEAT USING ENGINE COOLANT

• US 20090139472A1
• Filed: 12/03/2007
• Published: 06/04/2009
• Est. Priority Date: 12/03/2007
• Status: Active Grant

• Current Assignee: International Truck Intellectual Property Co. LLC (Volkswagen AG)
• Original Assignee: International Truck Intellectual Property Co. LLC (Volkswagen AG)
• Inventors: Smith, Kenneth J., Gehres, Michelle R., Hernandez, Joaquin J.
• Granted Patent: US 7,614,368 B2
• Time in Patent Office: Days
• US Class Current: 123/41.80
• CPC Class Codes: B60H 1/032 from the cooling liquid of the propulsion plant and from a burner
• CPC Class Codes: F01P 2005/105 Using two or more pumps
• CPC Class Codes: F01P 2060/08 Cabin heater
• CPC Class Codes: F01P 7/16 by thermostatic control

Abstract

To avoid engine idling to support cabin heating, an auxiliary coolant heater can heat engine coolant and pump it through compartment heaters or the engine cooling system. The coolant flow control system provides great flexibility in selectively distributing heated coolant for heating and engine preheating.

Claims

1. A motor vehicle comprising:

an internal combustion engine;

an engine cooling system for the internal combustion engine including a pump for circulating coolant through the internal combustion engine;

an auxiliary coolant beater including an auxiliary pump;

a passenger cabin;

a primary heat exchanger installed with respect to the passenger cabin to release heat into the passenger cabin;

an auxiliary heat exchanger installed with respect to the passenger cabin to release heat into the passenger cabin;

a coolant circulating circuit connected to the auxiliary pump from which coolant can be selectively delivered to any one of the engine cooling system, the primary heat exchanger, the auxiliary heat exchanger and the auxiliary coolant heater;

an engine cooling system outlet control valve, a primary heat exchanger flow control valve, an auxiliary heat exchanger flow control valve and an auxiliary heater flow control valve, the engine cooling system outlet control valve providing for selectively isolating the engine cooling system within and interconnecting the engine cooling system to coolant circulating circuit, and the primary heat exchanger flow control valve, the auxiliary heat exchanger flow control valve and the auxiliary heater flow control valve providing for cutting off and allowing the flow of coolant through the primary heat exchanger, the auxiliary heat exchanger and the auxiliary heater, respectively;

a climate controller coupled to open, close and modulate the engine cooling system outlet control valve, the primary heat exchanger flow control valve, the auxiliary heat exchanger flow control valve and the auxiliary heater flow control valve in response to selection of one of a plurality of operating states; and

the plurality of operating states including a first state where the auxiliary heater is running and the internal combustion engine is off, a second state where the engine is off and the auxiliary heater is on, a third state where the internal combustion engine and the auxiliary heater are concurrently running and in which the engine cooling system outlet control valve is closed to isolate the engine cooling system, and a fourth state where the internal combustion engine is on and the auxiliary heater is off.

2. A motor vehicle in accord with claim 1, further comprising:

input sources connected for communication to the climate controller indicating engine operational state and coolant temperature;

operator inputs connected for communication to the climate controller for selecting cabin heating functions including defrosting; and

the climate controller being responsive to the input sources and the operator inputs for determining the operating state of the coolant circulation circuit and being further responsive to the determined operating state for selecting opened and closed states for each of the engine cooling system outlet control valve, the primary heat exchanger flow control valve, the auxiliary heat exchanger flow control valve and the auxiliary heater flow control valve.

3. A motor vehicle in accord with claim 2, further comprising:

in the first state opening the engine cooling system outlet control valve to allow coolant flow through the engine cooling system, closing the primary heat exchanger flow control valve, closing the auxiliary heat exchanger flow control valve and opening the auxiliary heater flow control valve.

4. A motor vehicle in accord with claim 2, further comprising:

in the second state modulating the engine cooling system outlet control valve to periodically allow coolant flow through the engine cooling system, closing the primary heat exchanger flow control valve, opening the auxiliary heat exchanger flow control valve and opening the auxiliary heater flow control valve.

5. A motor vehicle in accord with claim 2, further comprising:

in the third state closing the engine cooling system outlet control valve and isolating the engine cooling system, opening or modulating the primary heat exchanger flow control valve for reverse flow, opening or modulating the auxiliary heat exchanger flow control valve for reverse flow and opening the auxiliary heater flow control valve.

6. A motor vehicle in accord with claim 2, further comprising:

in the fourth state opening the engine cooling system outlet control valve to allow coolant flow through the engine cooling system, opening or modulating the primary heat exchanger flow control valve, opening or modulating the auxiliary heat exchanger flow control valve and closing the auxiliary heater flow control valve.

7. A coolant circulation circuit for climate control and preheat comprising:

a primary heat source for coolant having a primary pump and an internal coolant circulation subcircuit;

an auxiliary coolant heater including an auxiliary pump;

a primary heat exchanger for sinking beat from circulating coolant;

an auxiliary beat exchanger for sinking heat from circulating coolant;

connections between the internal coolant circulation sub-circuit and the primary heat exchanger, the auxiliary heat exchanger and the auxiliary coolant heater;

an outlet control valve for the internal coolant circulation sub-circuit, a primary heat exchanger flow control valve, an auxiliary heat exchanger flow control valve and an auxiliary heater flow control valve, the outlet control valve allowing for isolation of the internal coolant circulation sub-circuit;

the primary heat exchanger flow control valve, the auxiliary heat exchanger flow control valve and the auxiliary heater flow control valve providing for cutting off and allowing the flow of coolant through anymore or more of the primary heat exchanger, the auxiliary heat exchanger or the auxiliary heater, respectively;

a controller coupled to open, close and modulate the outlet control valve, the primary heat exchanger flow control valve, the auxiliary heat exchanger flow control valve and the auxiliary heater flow control valve in response to selection of one of a plurality of operating states; and

the plurality of operating states including a first state where the auxiliary heater is running and the primary heat source is off, a second state where the primary heat source is off and the auxiliary heater is on, a third state where the primary heat source and the auxiliary heater are concurrently on, and a fourth state in which the primary heat source is on and the auxiliary heater is off.

8. A coolant circulation circuit in accord with claim 7, further comprising:

input sources connected for communication to the controller indicating a primary pump operational state and coolant temperature;

operator inputs connected for communication to the controller for selecting among the primary and auxiliary heat exchangers for operation; and

the controller being responsive to the input sources and the operator inputs for determining the operating state of the coolant circulation circuit and being further responsive to the determined operating state for selecting opened and closed states for each of the outlet control valve, the primary heat exchanger flow control valve, the auxiliary beat exchanger flow control valve and the auxiliary heater flow control valve.

9. A coolant circulation circuit in accord with claim 8, further comprising:

in the first state opening the outlet control valve, closing the primary heat exchanger flow control valve, closing the auxiliary heat exchanger flow control valve and opening the auxiliary heater flow control valve.

10. A coolant circulation circuit in accord with claim 8, further comprising:

in the second state modulating the outlet control valve, closing the primary heat exchanger flow control valve, opening the auxiliary heat exchanger flow control valve and opening the auxiliary heater flow control valve.

11. A coolant circulation circuit accord with claim 8, further comprising:

in the third state closing the outlet control valve and isolating the engine cooling system, opening or modulating the primary heat exchanger flow control valve for reverse flow, opening or modulating the auxiliary heat exchanger flow control valve for reverse flow and opening the auxiliary heater flow control valve.

12. A motor vehicle in accord with claim 8, further comprising:

in the fourth state opening the outlet control valve to allow coolant flow through the engine cooling system, opening or modulating the primary heat exchanger flow control valve, opening or modulating the auxiliary heat exchanger flow control valve and closing the auxiliary heater flow control valve.