US 10,215,199 B2Granted

Travel and work functions integrated into a hydraulic hybrid system

AssigneeDana Italia S.R.L.

InventorsEttore Cosoli, Giulio Ornella, Lorenzo Serrao

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Abstract

A series hydraulic hybrid system for a vehicle is described. The system has a hydraulic circuit, a hydraulic working assembly, and a hydraulic accumulator assembly. The hydraulic circuit has a first hydraulic displacement unit in fluid communication with a second hydraulic displacement unit. The first hydraulic displacement unit is drivingly engaged with a power source. The hydraulic working assembly has a hydraulic implement and a hydraulic working pump in fluid communication with the hydraulic implement, the hydraulic working pump drivingly engaged with the power source. The hydraulic accumulator assembly has a high pressure hydraulic accumulator and a low pressure hydraulic accumulator. The hydraulic accumulator assembly selectively fluidly connects to the hydraulic circuit and the hydraulic accumulator assembly selectively fluidly connects to the hydraulic working assembly.

Claims11

Dependent claims

A series hydraulic hybrid system for a vehicle, comprising:

a hydraulic circuit comprising a first hydraulic displacement unit in fluid communication with a second hydraulic displacement unit, the first hydraulic displacement unit drivingly engaged or selectively drivingly engaged with a power source, and the second hydraulic displacement unit drivingly engaged or selectively drivingly engaged with a vehicle output;
a hydraulic working assembly comprising a hydraulic implement and a hydraulic working pump in fluid communication with the hydraulic implement, the hydraulic working pump drivingly engaged or selectively drivingly engaged with the power source;
and
a hydraulic accumulator assembly comprising a high pressure hydraulic accumulator and a low pressure hydraulic accumulator, the hydraulic accumulator assembly selectively fluidly connected to the hydraulic circuit and the hydraulic accumulator assembly selectively fluidly connected to the hydraulic working assembly;
at least one high pressure accumulator valve for selectively fluidly connecting the high pressure accumulator to the hydraulic circuit;
at least one low pressure accumulator valve for selectively fluidly connecting the low pressure accumulator to the hydraulic circuit;
and
an electronic control unit configured to control the at least one high pressure accumulator valve and the at least one low pressure accumulator valve through electromagnetic signals such that hydraulic fluid may be displaced from the high pressure accumulator to the low pressure accumulator through the second hydraulic displacement unit, thereby driving the second hydraulic displacement unit and the vehicle output drivingly engaged with the second hydraulic displacement unit.

5 more elements

A method of operating a series hydraulic hybrid system, the method comprising the steps of:

a) providing the series hydraulic hybrid system comprising:
a hydraulic circuit comprising a first hydraulic displacement unit in fluid communication with a second hydraulic displacement unit, the first hydraulic displacement unit drivingly engaged or selectively drivingly engaged with a power source;
a hydraulic working assembly comprising a hydraulic implement and a hydraulic working pump in fluid communication with the hydraulic implement, the hydraulic working pump drivingly engaged or selectively drivingly engaged with the power source;
and
a hydraulic accumulator assembly comprising a high pressure hydraulic accumulator and a low pressure hydraulic accumulator, the hydraulic accumulator assembly selectively fluidly connected to the hydraulic circuit and the hydraulic accumulator assembly selectively fluidly connected to the hydraulic working assembly, wherein the high pressure hydraulic accumulator is selectively fluidly connected to the hydraulic working assembly, such that the hydraulic working pump is adapted to selectively displace hydraulic fluid from the hydraulic working assembly to the high pressure hydraulic accumulator for pressurizing the high pressure hydraulic accumulator, and such that, when the high pressure hydraulic accumulator is charged, the high pressure hydraulic accumulator is adapted to selectively displace hydraulic fluid from the high pressure hydraulic accumulator to the hydraulic implement for driving the hydraulic implement;
and
b) one of:
fluidly connecting the high pressure hydraulic accumulator to the hydraulic working pump, and driving the hydraulic working pump to displace hydraulic fluid from the hydraulic working assembly to the high pressure hydraulic accumulator for pressurizing the high pressure hydraulic accumulator;
and
fluidly connecting the high pressure hydraulic accumulator to the hydraulic implement, and displacing hydraulic fluid from the high pressure hydraulic accumulator to the hydraulic implement for driving the hydraulic implement.

7 more elements

A method of operating a series hydraulic hybrid system, the method comprising the steps of:

a) providing the series hydraulic hybrid system comprising:
a hydraulic circuit comprising a first hydraulic displacement unit in fluid communication with a second hydraulic displacement unit, the first hydraulic displacement unit drivingly engaged or selectively drivingly engaged with a power source;
a hydraulic working assembly comprising a hydraulic implement and a hydraulic working pump in fluid communication with the hydraulic implement, the hydraulic working pump drivingly engaged or selectively drivingly engaged with the power source;
and
a hydraulic accumulator assembly comprising a high pressure hydraulic accumulator and a low pressure hydraulic accumulator, the hydraulic accumulator assembly selectively fluidly connected to the hydraulic circuit and the hydraulic accumulator assembly selectively fluidly connected to the hydraulic working assembly, wherein the low pressure hydraulic accumulator is selectively fluidly connected to the hydraulic working assembly, such that the hydraulic working pump is adapted to selectively displace hydraulic fluid from the hydraulic working assembly to the low pressure hydraulic accumulator for pressurizing the low pressure hydraulic accumulator, and such that, when the low pressure hydraulic accumulator is charged, the low pressure hydraulic accumulator is adapted to selectively displace hydraulic fluid from the low pressure hydraulic accumulator to the hydraulic implement for driving the hydraulic implement;
and
b) one of:
fluidly connecting the low pressure hydraulic accumulator to the hydraulic working pump, and driving the hydraulic working pump to displace hydraulic fluid from the hydraulic working assembly to the low pressure hydraulic accumulator for pressurizing the low pressure hydraulic accumulator;
and
fluidly connecting the low pressure hydraulic accumulator to the hydraulic implement, and displacing hydraulic fluid from the low pressure hydraulic accumulator to the hydraulic implement for driving the hydraulic implement.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/330,077Filed 3 Feb 2015 · us provisional application
Priority: 4 Feb 2014
Published: US 2016/0377097 A129 Dec 2016
Granted: 26 Feb 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification23 codes

F15B 11/17
With two or more servomotors: using two or more pumps
B60K 6/12
Prime-movers comprising combustion engines and mechanical or fluid energy storing means: by means of a chargeable fluidic accumulator
F15B 1/02
Installations or systems with accumulators; Supply reservoir or sump assemblies: installations or systems with accumulators
F15B 1/024
Installations or systems with accumulators: used as a supplementary power source, e.g. to store energy in idle periods to balance pump load