Cooling circuit of a liquid-cooled internal combustion engine

• US 20030116105A1
• Filed: 12/13/2002
• Published: 06/26/2003
• Est. Priority Date: 12/15/2001
• Status: Active Grant

• Current Assignee: DaimlerChrysler AG (Mercedes-Benz Group AG)
• Original Assignee: DaimlerChrysler AG (Mercedes-Benz Group AG)
• Inventors: Pfeffinger, Harald, Sass, Heiko
• Granted Patent: US 6,772,715 B2
• Time in Patent Office: Days
• US Class Current: 123/41.31
• CPC Class Codes: F01P 2005/105 Using two or more pumps
• CPC Class Codes: F01P 2005/125 Driving auxiliary pumps electrically
• CPC Class Codes: F01P 2007/146 using valves
• CPC Class Codes: F01P 2025/40 Oil temperature
• CPC Class Codes: F01P 2060/04 Lubricant cooler
• CPC Class Codes: F01P 2060/045 for transmissions
• CPC Class Codes: F01P 2060/08 Cabin heater
• CPC Class Codes: F01P 3/20 Cooling circuits not specific to a single part of engine or machine F01P3/22 takes precedence
• CPC Class Codes: F01P 7/16 by thermostatic control
• CPC Class Codes: F02M 26/28 with liquid-cooled heat exchangers
• CPC Class Codes: F16H 57/0412 Cooling or heating; Control of temperature
• CPC Class Codes: F16H 57/0413 Controlled cooling or heating of lubricant; Temperature control therefor

Abstract

In a cooling circuit of a liquid-cooled internal combustion engine of a motor vehicle having a coolant pump, an electrical mixing valve, a radiator, a heater, an engine-oil heat exchanger, a transmission-oil cooler with a heat flux from the transmission oil to the ambient air, a transmission-oil heat exchanger providing for a heat flux between the transmission oil and the cooling water and being arranged in parallel flow circuit with the transmission-oil cooler, and an actuator for controlling the oil flow distribution, an electrical mixing valve is arranged between the transmission-oil cooler and the transmission-oil heat exchanger, such that the heat transfer in the transmission-oil heat exchanger can be controlled by the electrical mixing valve by controlling the coolant flow through the transmission oil heat exchanger and the radiator.

Claims

1. A cooling circuit of a liquid-cooled internal combustion engine of a motor vehicle having a coolant pump, an electrical mixing valve, a radiator, a heater, an engine-oil heat exchanger, a transmission-oil cooler with a heat flux from the transmission oil to the ambient air, and a transmission-oil heat exchanger with a heat exchange between the transmission oil and the cooling water, and an actuator (18) for controlling the transmission oil flow distribution, said actuator being arranged between said transmission-oil cooler (7) and the transmission-oil heat exchanger (9), which is connected in parallel with the transmission-oil cooler and an electrical mixing valve (5) disposed in said cooling circuit so as to be able to control the coolant flow through the radiator and the transmission oil heat exchanger and, as a result, the heat transfer between the cooling water and the transmission oil in the transmission-oil heat exchanger (9).

2. A cooling circuit according to claim 1, wherein said actuator (18) is controllable as a function of operating parameters.

3. A cooling circuit according to claim 1, wherein said actuator (18) is controllable as a function of the temperature of the transmission oil.

4. A cooling circuit according to claim 1, wherein said actuator (18) is under the control of a control unit.

5. A cooling circuit according to claim 1, wherein said actuator (18) is arranged downstream of the transmission-oil cooler (7) and the transmission-oil heat exchanger (9).

6. A cooling circuit according to claim 1, wherein said actuator (18) is arranged upstream of the transmission-oil cooler (7) and the transmission-oil heat exchanger (9).

7. A cooling circuit according to claim 1, wherein a cooling-water side of the transmission-oil heat exchanger (9) is connected in a parallel flow circuit with the radiator (6).

8. A cooling circuit according to claim 1, wherein a cooling-water side of the transmission-oil heat exchanger (9) is connected in series with at least one of said heater (14) and said engine-oil heat exchanger (16) in a sub-circuit (12).