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US 10,882,373 B1Granted
High pressure gas spring controls for improved vehicle leveling
AssigneeOshkosh Defense, LLC
InventorsDeepak Shukla, David Hansen, Ron Zhang
Life of this patent
Estimating the term…
Abstract
Systems and methods for controlling a gas spring in a suspension system. The suspension system includes a gas spring and an accumulator coupled to the gas spring and having a bladder. The accumulator may be in a compressed state and an uncompressed state based on a pressure difference across the bladder. A target amount of gas in the gas spring is determined. The amount of gas in the gas spring is adjusted towards the target amount of gas in accordance with a pressure difference across the bladder based on the difference between the first pressure and the second pressure.
Claims20
A suspension system, comprising:
- a gas spring;
- an accumulator coupled to the gas spring and including a bladder, the accumulator having a compressed state and an uncompressed state, the accumulator being in the compressed state or the uncompressed state based on a pressure difference across the bladder, and the accumulator including a volume of gas located therein;
- a first sensor arranged to detect a first pressure on a first side of the bladder;
- a second sensor arranged to detect a second pressure on a second side of the bladder opposite the first side;
- and
- a suspension controller operatively connected to the gas spring, the suspension controller executing instructions stored on memory to:
- determine an amount of gas in a spring assembly including the gas spring and the accumulator by multiplying the volume of gas in the accumulator with one of the first pressure and the second pressure;
- determine a target amount of gas in the spring assembly;
- and
- adjust the amount of gas in the spring assembly towards the target amount of gas.
7 more elements
A vehicle, comprising:
- a suspension system, the suspension system including:
- a gas spring;
- an accumulator coupled to the gas spring and including a bladder, the accumulator having a compressed state and an uncompressed state, the accumulator being in the compressed state or the uncompressed state based on a pressure difference across the bladder, and the accumulator including a volume of gas located therein;
- a first sensor arranged to detect a first pressure on a first side of the bladder;
- and
- a second sensor arranged to detect a second pressure on a second side of the bladder opposite the first side;
- and
- a controller operatively connected to the gas spring, the controller executing instructions stored on memory to:
- determine an amount of gas in a spring assembly including the gas spring and the accumulator by multiplying the volume of gas in the accumulator with one of the first pressure and the second pressure;
- determine a target amount of gas in the spring assembly;
- and
- adjust the amount of gas in the spring assembly towards the target amount of gas.
9 more elements
A method of controlling a gas spring in a suspension system, the method comprising:
- detecting a first pressure on a first side of a bladder of an accumulator coupled to the gas spring, wherein the accumulator includes a volume of gas located therein;
- detecting a second pressure on a second side of the bladder opposite the first side;
- determining an amount of gas in a spring assembly that includes the gas spring and the accumulator, wherein determining the amount of gas comprises multiplying the volume of gas in the accumulator with the greater of the first pressure and the second pressure;
- determining a target amount of gas in the spring assembly;
- and
- adjusting the amount of gas in the spring assembly towards the target amount of gas.
3 more elements
A method of controlling a gas spring in a suspension system, the method comprising:
- detecting a first pressure on a first side of a bladder of an accumulator coupled to the gas spring;
- detecting a second pressure on a second side of the bladder opposite the first side;
- determining a target spring length;
- determining, based on the target spring length, a gas spring volume associated therewith;
- estimating a mass of a body acting on the gas spring;
- determining a target pressure based on the gas spring volume and the estimated mass;
- determining a target amount of gas in a spring assembly that includes the gas spring and the accumulator by 1) multiplying the target pressure and the gas spring volume and 2) adding thereto a volume of gas located in the accumulator multiplied by the greater of a) the target pressure and b) a pressure in the accumulator;
- and
- adjusting an amount of gas in the spring assembly towards the target amount of gas.
6 more elements
A suspension system, comprising:
- a gas spring;
- an accumulator coupled to the gas spring and including a bladder, the accumulator having a compressed state and an uncompressed state, the accumulator being in the compressed state or the uncompressed state based on a pressure difference across the bladder;
- and
- a suspension controller operatively connected to the gas spring, the suspension controller executing instructions stored on memory to:
- determine a target amount of gas in a spring assembly that includes the gas spring and the accumulator according to:
- Qtarget=Ps,target(Vs,target+Vdeadvol)+max(Paccumulator,Ps,target)Vaccumulator
- where Ps,target is a target pressure for the gas spring, Vs,target is a target volume in the gas spring based on a length of the gas spring, Vdeadvol is a constant volume in the gas spring, Paccumulator is a pressure within the in the accumulator, Vaccumulator is a constant volume in the accumulator, and max(Paccumulator, Ps,target) is whichever of Paccumulator and Ps,target is greater;
- and
- adjust an amount of gas in the spring assembly towards the target amount of gas.
6 more elements
A suspension system, comprising:
- a gas spring;
- an accumulator coupled to the gas spring and including a bladder, the accumulator having a compressed state and an uncompressed state, the accumulator being in the compressed state or the uncompressed state based on a pressure difference across the bladder;
- and
- a suspension controller operatively connected to the gas spring, the suspension controller executing instructions stored on memory to:
- determine a target spring length;
- determine, based on the target spring length, a gas spring volume associated therewith;
- estimate a mass of a body acting on the gas spring;
- determine a target pressure based on the gas spring volume and the estimated mass;
- determine a target amount of gas by 1) multiplying the target pressure and the gas spring volume and 2) adding thereto a volume of gas located in the accumulator multiplied by the greater of a) the target pressure and b) a pressure in the accumulator;
- and
- adjust an amount of gas in a spring assembly toward the target amount of gas, the spring assembly including the gas spring and the accumulator.
8 more elements
A vehicle, comprising:
- a suspension system, the suspension system including:
- a gas spring;
- and
- an accumulator coupled to the gas spring and including a bladder, the accumulator having a compressed state and an uncompressed state, the accumulator being in the compressed state or the uncompressed state based on a pressure difference across the bladder;
- and
- a controller operatively connected to the gas spring, the controller executing instructions stored on memory to:
- determine a target amount of gas in a spring assembly that includes the gas spring and the accumulator according to:
- Qtarget=Ps,target(Vs,target+Vdeadvol)+max(Paccumulator,Ps,target)Vaccumulator
- where Ps,target is a target pressure for the gas spring, Vs,target is a target volume in the gas spring based on a length of the gas spring, Vdeadvol is a constant volume in the gas spring, Paccumulator is a pressure within the in the accumulator, Vaccumulator is a constant volume in the accumulator, and max(Paccumulator, Ps,target) is whichever of Paccumulator and Ps,target is greater;
- and
- adjust an amount of gas in the spring assembly towards the target amount of gas in accordance with the pressure difference across the bladder.
8 more elements
A suspension system, comprising:
- a suspension system, the suspension system including:
- a gas spring;
- and
- an accumulator coupled to the gas spring and including a bladder, the accumulator having a compressed state and an uncompressed state, the accumulator being in the compressed state or the uncompressed state based on a pressure difference across the bladder;
- and
- a controller operatively connected to the gas spring, the controller executing instructions stored on memory to:
- determine a target spring length;
- determine, based on the target spring length, a gas spring volume associated therewith;
- estimate a mass of a body acting on the gas spring;
- determine a target pressure based on the gas spring volume and the estimated mass;
- determine a target amount of gas by 1) multiplying the target pressure and the gas spring volume and 2) adding thereto a volume of gas located in the accumulator multiplied by the greater of a) the target pressure and b) a pressure in the accumulator;
- and
- adjust an amount of gas in a spring assembly toward the target amount of gas, the spring assembly including the gas spring and the accumulator.
10 more elements
A method of controlling a gas spring in a suspension system, the method comprising:
- detecting a first pressure on a first side of a bladder of an accumulator coupled to the gas spring;
- detecting a second pressure on a second side of the bladder opposite the first side;
- determining a target amount of gas in a spring assembly that includes the gas spring and the accumulator according to:
- Qtarget=Ps,target(Vs,target+Vdeadvol)+max(Paccumulator,Ps,target)Vaccumulator
- where Ps,target is a target pressure for the gas spring, Vs,target is a target volume in the gas spring based on a length of the gas spring, Vdeadvol is a constant volume in the gas spring, Paccumulator is a pressure within the in the accumulator, Vaccumulator is a constant volume in the accumulator, and max(Paccumulator, Ps,target) is whichever of Paccumulator and Ps,target is greater;
- and
- adjusting an amount of gas in the spring assembly towards the target amount of gas based on the first pressure and the second pressure.
4 more elements
Dependencies are inferred from the claim text.