FLUID SUPPLY SYSTEM AND METHOD OF OPERATING A FLUID SUPPLY SYSTEM
First Claim
1. A fluid supply system for cooling and lubricating a transmission of an automobile, comprising:
- a cooling channel configured to cool the transmission; and
a lubrication channel configured to lubricate the transmission,the lubrication channel is further configured to communicate with the cooling channel via a shift valve,wherein the shift valve is configured to;
provide at least a first valve status by which the cooling channel is connected to the lubrication channel via a first valve path, andprovide a second valve status, by which the cooling channel is connected to the lubrication channel via at least the first valve path and by which the cooling channel is connected in addition via a second valve path to a bypass channel bypassing the lubrication channel.
3 Assignments
0 Petitions
Accused Products
Abstract
A fluid supply system is provided for cooling and lubricating a transmission of an automobile, which includes, but is not limited to a cooling channel for cooling the transmission and a lubrication channel for lubricating the transmission. The lubrication channel communicates with the cooling channel via a shift valve. The shift valve is adapted to provide at least a first valve status, by which the cooling channel is connected to the lubrication channel via only one first valve path, and a second valve status, by which the cooling channel is connected to the lubrication channel via at least the first valve path and by which the cooling channel is connected in addition via a second valve path to a bypass channel bypassing the lubrication channel. Since at least two different valve statuses optimized for low and high power are provided, it is possible to reduce unnecessary spin losses over the whole range of applied powers. Further, there is no need for unfavorable compromises, so that a reduced flow generation loss over the whole range of applied powers is provided, while sufficient cooling and lubricating is safeguarded at the same time.
-
Citations
13 Claims
-
1. A fluid supply system for cooling and lubricating a transmission of an automobile, comprising:
-
a cooling channel configured to cool the transmission; and a lubrication channel configured to lubricate the transmission, the lubrication channel is further configured to communicate with the cooling channel via a shift valve, wherein the shift valve is configured to; provide at least a first valve status by which the cooling channel is connected to the lubrication channel via a first valve path, and provide a second valve status, by which the cooling channel is connected to the lubrication channel via at least the first valve path and by which the cooling channel is connected in addition via a second valve path to a bypass channel bypassing the lubrication channel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. An automatic transmission for an automobile, comprising:
-
a gear case; an automatic gear assembly inside of the gear case; a fluid supply system configured to cool and lubricate the automatic gear assembly, the fluid supply system, comprising; a cooling channel configured to cool the automatic transmission; and a lubrication channel configured to lubricate the automatic transmission, the lubrication channel is further configured to communicate with the cooling channel via a shift valve, wherein the shift valve is configured to; provide a first valve status by which the cooling channel is connected to the lubrication channel via a first valve path, and provide a second valve status, by which the cooling channel is connected to the lubrication channel via the first valve path and by which the cooling channel is connected in addition via a second valve path to a bypass channel bypassing the lubrication channel. - View Dependent Claims (12)
-
-
13. A method of operating a fluid supply system, comprising:
-
placing a shift valve into a first valve status; switching the shift valve into a second valve status when a mass flow {dot over (m)}C of a cooling channel exceeds a predetermined mass flow threshold, wherein the predetermined mass flow threshold is particularly chosen such, that the second valve status is applied when the first valve status provides a lubrication flow {dot over (m)}L exceeding a required minimum lubrication flow {dot over (m)}L,min (P) by a predefined tolerance value Δ
{dot over (m)}switch.
-
Specification