Cooling system of a motor vehicle

Patent metadata

Field	Value
Publication number	US-2016363101-A1
Application number	US-201615177971-A
Country	US
Kind code	A1
Filing date	Jun 9, 2016
Priority date	Jun 10, 2015
Publication date	Dec 15, 2016
Grant date	—

Abstract

A cooling system of a motor vehicle may include a coolant circuit including an exhaust-gas recirculation path and an exhaust-gas recirculation cooler arranged therein. A pressure detection device may be provided for detecting a coolant pressure in the coolant circuit. An actuating device may be connected communicatively to the pressure deduction device. A valve device may be connected communicatively to the actuating device and configured to control an exhaust-gas stream passing into the cooler. The actuating device may be configured to at least partially close the valve device and reduce the exhaust-gas stream flowing to the cooler in response to the pressure detection device detecting a predefined pressure drop.

First claim

1 . A cooling system of a motor vehicle, comprising:
a coolant circuit including an exhaust-gas recirculation path and an exhaust-gas recirculation cooler incorporated into the exhaust-gas recirculation path, a pressure detection device for detecting a coolant pressure in the coolant circuit, an actuating device, wherein the pressure detection device is connected communicatively to the actuating device, and a valve device connected communicatively to the actuating device, wherein the valve device is configured to control an exhaust-gas stream passing into the exhaust-gas recirculation cooler, wherein the actuating device is configured to at least partially close the valve device and at least reduces the exhaust-gas stream flowing to the exhaust-gas recirculation cooler, if in response to the pressure detection device detecting a predefined pressure drop.

2 . The cooling system according to claim 1 , wherein the actuating device is configured to close the valve device, and stop the exhaust-gas stream from flowing into the exhaust-gas recirculation cooler, if in response to the pressure detection device detecting the predefined pressure drop.

3 . The cooling system according to claim 1 , wherein the valve device is a flap.

4 . The cooling system according to claim 1 , wherein the valve device is preloaded into a closed position via a spring.

5 . The cooling system according to claim 1 , wherein at least one of:
the valve device is arranged at the exhaust-gas recirculation cooler, on a downstream side or an upstream side, in the exhaust-gas recirculation path, and the valve device is integrated into an exhaust-gas recirculation valve.

6 . The cooling system according to claim 1 , wherein the pressure detection device includes at least one pressure sensor.

7 . The cooling system according to claim 1 , wherein the pressure detection device includes at least two pressure sensors, which are arranged in the coolant circuit.

8 . The cooling system according to claim 7 , wherein the at least two pressure sensors are arranged at an inlet side and at an outlet side of the exhaust-gas recirculation cooler.

9 . The cooling system according to claim 1 , wherein at least one of:
the pressure detection device and the actuating device are integrated in a pressure capsule or in a differential-pressure capsule, and pressure detection device is configured as a pressure switch, and the actuating device is configured as an electric actuator.

10 . The cooling system according to claim 1 , wherein:
at least the pressure detection device, the actuating device and the valve device is in the together form an autonomously operating system, or at least the pressure detection device, the actuating device and the valve device are connected communicatively to an engine control unit.

11 . A motor vehicle, comprising: a cooling system, the cooling system including:
a cooling circuit including an exhaust-gas recirculation path and an exhaust-gas recirculation cooler arranged in the exhaust-gas recirculation path; a pressure detection device for detecting a coolant pressure in the coolant circuit; an actuating device connected communicatively to the pressure reduction device; and a valve device connected communicatively to the actuating device, the valve device configured to control an exhaust-gas stream passing into the exhaust-gas recirculation cooler; wherein the actuating device is configured to at least partially close the valve device and impede a flow of the exhaust-gas stream passing into the exhaust-gas recirculation cooler in response to the pressure detection device detecting a predefined pressure drop of the coolant pressure.

12 . A method for operating a cooling system of a motor vehicle, comprising:
detecting via a pressure detection device a coolant pressure in a coolant circuit, wherein the pressure detection device is connected communicatively to an actuating device and the coolant circuit includes an exhaust-gas recirculation path and an exhaust-gas recirculation cooler, and reducing a flow of an exhaust-gas stream passing into the exhaust-gas recirculation cooler by at least partially closing a valve device via the actuation device in response to, the pressure detection device detecting a predefined pressure drop of the coolant pressure.

13 . The motor vehicle according to claim 11 , wherein the valve device includes a flap.

14 . The motor vehicle according to claim 11 , wherein the pressure detection device includes at least one pressure sensor.

15 . The motor vehicle according to claim 11 , wherein the pressure detection device and the actuation device are integrated into a pressure capsule.

16 . The motor vehicle according to claim 11 , wherein the pressure detection device includes a pressure switch and the actuating device includes an electric actuator.

17 . The motor vehicle according to claim 11 , wherein the valve device is arranged in the exhaust-gas recirculation path at the exhaust-gas recirculation cooler.

18 . The motor vehicle according to claim 11 , wherein the pressure detection device, the actuating device and the valve device together form an autonomous operating system.

19 . The cooling system according to claim 1 , wherein the pressure detection device includes a pressure switch configured as a piezo element and the actuating device includes an electric actuator.

20 . The cooling system according to claim 1 , wherein the valve device is arranged in the exhaust-gas recirculation path at the exhaust-gas recirculation cooler.

Assignees

• Mahle Int Gmbh

Inventors

• Maucher Ulrich
• Pantow Eberhard

Classifications

• F02D41/0055

  Special engine operating conditions, e.g. for regeneration of exhaust gas treatment apparatus · CPC title

• F01P3/20

  Cooling circuits not specific to a single part of engine or machine (F01P3/22 takes precedence) · CPC title

• F01P11/18

  concerning coolant pressure, coolant flow, or liquid-coolant level · CPC title

• F02M26/28

  with liquid-cooled heat exchangers · CPC title

• F02M26/49

  Detecting, diagnosing or indicating an abnormal function of the EGR system · CPC title