Motor vehicle with a cooling system

Patent metadata

Field	Value
Publication number	US-10773586-B2
Application number	US-201816124640-A
Country	US
Kind code	B2
Filing date	Sep 7, 2018
Priority date	Sep 7, 2017
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

A motor vehicle with a cooling system, comprising an electric traction motor, an ambient heat exchanger, a bypass to the ambient heat exchanger, a traction battery, a coolant heater, a coolant-refrigerant heat exchanger of an air conditioner, a first coolant pump, and a second coolant pump that are directly or indirectly connected or connectable to one another via coolant lines and a distribution system, characterized in that, in a first functional position of the distribution system, coolant is conveyable, by means of the first coolant pump, in a first coolant circuit that includes the traction motor, the bypass to the ambient heat exchanger, and the coolant-refrigerant heat exchanger, and coolant is conveyable, by means of the second coolant pump, in a second coolant circuit, separate from the first coolant circuit, that includes the traction battery and the coolant heater, and in a second functional position of the distribution system, coolant is conveyable, by means of the first coolant pump, in a third coolant circuit that includes the traction motor and the ambient heat exchanger, and coolant is conveyable, by means of the second coolant pump, in a fourth coolant circuit, separate from the third coolant circuit, that includes the traction battery and the coolant-refrigerant heat exchanger.

First claim

The invention claimed is:

1. A motor vehicle with a cooling system, comprising:
a first coolant circuit that includes an electric traction motor, a bypass to an ambient heat exchanger, and a coolant-refrigerant heat exchanger of an air conditioner;
a second coolant circuit, separate from the first coolant circuit, that includes a traction battery and a coolant heater;
a third coolant circuit that includes the traction motor and the ambient heat exchanger;
a fourth coolant circuit, separate from the third coolant circuit, that includes the traction battery and the coolant-refrigerant heat;
a first coolant pump; and
a second coolant pump;
wherein the traction motor, the ambient heat exchanger, the bypass to the ambient heat exchanger, the traction batter, the coolant heater, the coolant-refrigerant heat exchanger, the first coolant pump, and the second coolant pump are directly or indirectly connected or connectable to one another via coolant lines and a distribution system,
wherein, in a first functional position of the distribution system,
the first coolant pump is configured to convey coolant in the first coolant circuit, and
the second coolant pump is configured to convey coolant in the second coolant circuit, and

wherein, in a second functional position of the distribution system,
the first coolant pump is configured to convey coolant in a third coolant circuit, and
the second coolant pump is configured to convey coolant in a fourth coolant circuit.

2. The motor vehicle according to claim 1 , further comprising a fifth coolant circuit, which is separate form the second coolant circuit, that includes the traction motor and the bypass to the ambient heat exchanger;
wherein, in a third functional position of the distribution system,
the first coolant pump is configured to convey coolant in the fifth coolant circuit, and
the second coolant pump is configured to convey coolant in the second coolant circuit.

3. The motor vehicle according to claim 1 , further comprising a sixth coolant circuit that includes the traction motor, the ambient heat exchanger, and the traction battery;
wherein, in a fourth functional position of the distribution system, the first coolant pump and the second coolant pump are configured to convey coolant in the sixth coolant circuit.

4. The motor vehicle according to claim 1 , further comprising a seventh coolant circuit that includes the traction motor, the bypass to the ambient heat exchanger, and the traction battery;
wherein, in a fifth functional position of the distribution system, the first coolant pump and the second coolant pump are configured to convey coolant in the seventh coolant circuit.

5. The motor vehicle according to claim 1 , further comprising a DC-DC converter and/or a charging device and/or power electronics that are/is integrated:
into the first coolant circuit in the first functional position; and/or
into the third coolant circuit in the second functional position.

6. The motor vehicle according to claim 1 , further comprising:
a main circuit that integrates in series the traction motor, the combination of the ambient heat exchanger and the associated bypass, the traction battery, the first coolant pump, and the second coolant pump,
a first short-circuit line that integrates the coolant heater and that bridges a section of the main circuit that integrates the traction battery and the second coolant pump, and
a second short-circuit line that integrates the coolant-refrigerant heat exchanger and that bridges a section of the main circuit that integrates the traction battery, the second coolant pump, and the branches to the first short-circuit line,
wherein a first distribution device of the distribution system is integrated into at least one branch to the first short-circuit line and/or to the second short-circuit line.

7. The motor vehicle according to claim 6 , further comprising:
a fifth coolant circuit, which is separate from the second coolant circuit, that includes the traction motor and the bypass to the ambient heat exchanger; and
a third short-circuit line that bridges a section of the main circuit that integrates the traction battery, the second coolant pump, the branches to the first short-circuit line, and the branches to the second short-circuit line
wherein in a third functional position of the distribution system,
the first coolant pump is configured to convey coolant in the fifth coolant circuit, and
the second coolant pump is configured to convey coolant in the second coolant circuit.

8. The motor vehicle according to claim 7 , further comprising a second distribution device of the distribution system that is integrated into at least one branch to the third short-circuit line.

9. The motor vehicle according to claim 1 , wherein the motor vehicle is an electric vehicle.

10. The motor vehicle according to claim 1 , wherein the second coolant circuit does not include the coolant-refrigerant heat exchanger.

11. The motor vehicle according to claim 2 , further comprising a DC-DC converter and/or a charging device and/or power electronics that are/is integrated into the fifth coolant circuit in the third functional position.

12. The motor vehicle according to claim 3 , further comprising a DC-DC converter and/or a charging device and/or power electronics that are/is integrated into the sixth coolant circuit in the fourth functional position.

13. The motor vehicle according to claim 4 , further comprising a DC-DC converter and/or a charging device and/or power electronics that are/is integrated into the seventh coolant circuit in the fifth functional position.

Assignees

• Volkswagen Ag

Inventors

• Lucke Stefan
• Schulze Tobias
• Stelzner Robert
• Reuters Ulf

Classifications

• B60H1/3204

  using compression (B60H1/3233 takes precedence) · CPC title

• B60H1/00385

  for vehicles having an electrical drive, e.g. hybrid or fuel cell · CPC title

• B60H1/32281

  comprising a single secondary circuit, e.g. at evaporator or condenser side · CPC title

• B60H2001/00307

  Component temperature regulation using a liquid flow · CPC title

• B60H1/00392

  for electric vehicles having only electric drive means · CPC title