Low power HMT with by-pass valve
AssigneeSauer-Danfoss Inc.
InventorKeith R. Williams
Life of this patent
Estimating the term…
Abstract
A method of operating a vehicle with a hydrostatic circuit. The method includes providing a hydrostatic circuit having first and second hydraulic kits that are fluidly connected to one another by first and second fluid lines. A by-pass valve is placed between the first and second hydraulic lines and is controlled in order to actuate the by-pass valve when certain predetermined conditions are present in order to relieve pressure within the hydrostatic circuit.
Claims8
A method of operating a vehicle with a hydrostatic circuit comprising:
- providing said hydrostatic circuit having a first hydraulic kit fluidly connected to a second hydraulic kit via first and second fluid lines;
- providing a by-pass valve disposed between and fluidly connected to the first and second fluid lines;
- actuating the by-pass valve when a predetermined condition is present to relieve pressure in the hydrostatic circuit;
- and
- wherein the predetermined condition is wherein a difference between a hydromechanical transmission ratio and actual vehicle speed ratio is greater than a predefined offset amount.
A method of operating a vehicle with a hydrostatic circuit comprising:
- providing said hydrostatic circuit having a first hydraulic kit fluidly connected to a second hydraulic kit via first and second fluid lines;
- actuating the by-pass valve when a predetermined condition is present to relieve pressure in the hydrostatic circuit;
- wherein the predetermined condition is wherein the vehicle is commanded to stop;
- and
- wherein the by-pass valve is opened proportionately to a difference between HMT ratio and actual vehicle speed ratio.
A method of operating a vehicle with a hydrostatic circuit comprising:
- providing said hydrostatic circuit having a first hydraulic kit fluidly connected to a second hydraulic kit via first and second fluid lines;
- providing a by-pass valve disposed between and fluidly connected to the first and second fluid lines;
- actuating the by-pass valve when a predetermined condition is present to relieve pressure in the hydrostatic circuit;
- wherein the predetermined condition is wherein an engine of the vehicle is not operating;
- and wherein the by-pass valve is opened proportionately to vehicle speed.
Dependencies are inferred from the claim text.