Series parallel hydraulic hybrid architecture
First Claim
1. A dual motor hydraulic hybrid transmission, comprising:
- a power source;
a hydraulic circuit comprising;
a hydraulic pump drivingly engaged or selectively drivingly engaged with the power source;
a first hydraulic displacement unit in fluid communication with the hydraulic pump; and
a second hydraulic displacement unit in fluid communication with the hydraulic pump;
a hydraulic accumulator assembly comprising a high pressure accumulator and a low pressure accumulator, the hydraulic accumulator assembly in fluid communication with the hydraulic circuit;
one or more control valves; and
an output shaft;
wherein the first hydraulic displacement unit is drivingly engaged or selectively drivingly engaged with the output shaft, and wherein the second hydraulic displacement unit is drivingly engaged or selectively drivingly engaged with the output shaft; and
wherein the control valves are configured to selectively;
fluidly connect the hydraulic pump to the first hydraulic displacement unit while fluidly disconnecting the hydraulic pump from the second hydraulic displacement unit; and
, simultaneously,fluidly connect the hydraulic accumulator assembly to the second hydraulic displacement unit while fluidly disconnecting the hydraulic accumulator assembly from first hydraulic displacement unit;
wherein the control valves are additionally configured to selectively;
fluidly connect the hydraulic pump to the second hydraulic displacement unit while fluidly disconnecting the hydraulic pump from the first hydraulic displacement unit; and
simultaneously,fluidly connect the hydraulic accumulator assembly to the first hydraulic displacement unit while fluidly disconnecting the hydraulic accumulator assembly from second hydraulic displacement unit.
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Accused Products
Abstract
The invention relates to a dual motor hydraulic hybrid transmission. The transmission comprises a power source, a hydraulic circuit including a pump drivingly engaged with the power source and two displacement units, a hydraulic accumulator assembly including high and low pressure accumulators, one or more control valves, and an output shaft drivingly engaged with the first hydraulic displacement unit. The displacement units are in fluid communication with the hydraulic pump. The accumulators are in fluid communication with the hydraulic circuit. The second hydraulic displacement unit is drivingly engaged with the output shaft. The control valves are configured to selectively fluidly connect the hydraulic pump to the first hydraulic displacement unit while fluidly disconnecting the hydraulic pump from the second hydraulic displacement unit; and, simultaneously, fluidly connect the hydraulic accumulator assembly to the second hydraulic displacement unit while fluidly disconnecting the hydraulic accumulator assembly from first hydraulic displacement unit.
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Citations
12 Claims
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1. A dual motor hydraulic hybrid transmission, comprising:
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a power source; a hydraulic circuit comprising; a hydraulic pump drivingly engaged or selectively drivingly engaged with the power source; a first hydraulic displacement unit in fluid communication with the hydraulic pump; and a second hydraulic displacement unit in fluid communication with the hydraulic pump; a hydraulic accumulator assembly comprising a high pressure accumulator and a low pressure accumulator, the hydraulic accumulator assembly in fluid communication with the hydraulic circuit; one or more control valves; and an output shaft; wherein the first hydraulic displacement unit is drivingly engaged or selectively drivingly engaged with the output shaft, and wherein the second hydraulic displacement unit is drivingly engaged or selectively drivingly engaged with the output shaft; and wherein the control valves are configured to selectively; fluidly connect the hydraulic pump to the first hydraulic displacement unit while fluidly disconnecting the hydraulic pump from the second hydraulic displacement unit; and
, simultaneously,fluidly connect the hydraulic accumulator assembly to the second hydraulic displacement unit while fluidly disconnecting the hydraulic accumulator assembly from first hydraulic displacement unit; wherein the control valves are additionally configured to selectively; fluidly connect the hydraulic pump to the second hydraulic displacement unit while fluidly disconnecting the hydraulic pump from the first hydraulic displacement unit; and
simultaneously,fluidly connect the hydraulic accumulator assembly to the first hydraulic displacement unit while fluidly disconnecting the hydraulic accumulator assembly from second hydraulic displacement unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A dual motor hydraulic hybrid transmission, comprising:
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a power source; a hydraulic circuit comprising; a hydraulic pump drivingly engaged or selectively drivingly engaged with the power source; a first hydraulic displacement unit in fluid communication with the hydraulic pump; a second hydraulic displacement unit in fluid communication with the hydraulic pump; wherein the hydraulic pump, the first hydraulic displacement unit and the second hydraulic displacement unit each comprise a first fluid port and a second fluid port; a hydraulic accumulator assembly comprising a high pressure accumulator and a low pressure accumulator, the hydraulic accumulator assembly in fluid communication with the hydraulic circuit; one or more control valves, the control valves comprise a first pump valve, a second pump valve, and at least one accumulator valve in fluid communication with the hydraulic displacement units through the at least one pump valve; the first pump valve providing fluid communication between the first fluid port of the hydraulic pump, the first fluid port of the first hydraulic displacement unit and the first fluid port of the second hydraulic displacement unit, and the first pump valve having three control positions, wherein; when the first pump valve is set to the first control position, the first pump valve fluidly connects the first fluid port of the hydraulic pump to the first fluid port of the first hydraulic displacement unit and to the first fluid port of the second hydraulic displacement unit;
when the first pump valve is set to the second control position, the first pump valve fluidly connects the first fluid port of the hydraulic pump to the first fluid port of the first hydraulic displacement unit and fluidly disconnects the first fluid port of the hydraulic pump from the first fluid port of the second hydraulic displacement unit; and
when the first pump valve is set to the third control position, the first pump valve fluidly connects the first fluid port of the hydraulic pump to the first fluid port of the second hydraulic displacement unit and fluidly disconnects the first fluid port of the hydraulic pump from the first fluid port of the first hydraulic displacement unit;the second pump valve providing fluid communication between the second fluid port of the hydraulic pump, the second fluid port of the first hydraulic displacement unit and the second fluid port of the second hydraulic displacement unit, and the second pump valve having three control positions, wherein; when the second pump valve is set to the first control position, the second pump valve fluidly connects the second fluid port of the hydraulic pump to the second fluid port of the first hydraulic displacement unit and to the second fluid port of the second hydraulic displacement unit;
when the second pump valve is set to the second control position, the second pump valve fluidly connects the second fluid port of the hydraulic pump to the second fluid port of the first hydraulic displacement unit and fluidly disconnects the second fluid port of the hydraulic pump from the second fluid port of the second hydraulic displacement unit; and
when the second pump valve is set to the third control position, the second pump valve fluidly connects the second fluid port of the hydraulic pump to the second fluid port of the second hydraulic displacement unit and fluidly disconnects the second fluid port of the hydraulic pump from the second fluid port of the first hydraulic displacement unit;
the accumulator valve providing fluid communication between the accumulator assembly and the hydraulic displacement units and the accumulator valve having at least three control positions or control configurations, wherein the accumulator valve is configured such that;
when the accumulator valve is set to the first position/configuration, the hydraulic accumulator assembly is fluidly disconnected from the hydraulic circuit;
when the accumulator valve is set to the second position/configuration, the high pressure accumulator is selectively fluidly connected to the first fluid port of at least one of the first and the second hydraulic displacement unit, and the low pressure accumulator is fluidly connected to the corresponding second fluid port or fluid ports of the hydraulic displacement unit or units to which the high pressure accumulator is fluidly connected; andwhen the accumulator valve is set to the third position/configuration, the high pressure accumulator is selectively fluidly connected to the second fluid port of at least one of the first and the second hydraulic displacement unit and the low pressure accumulator is fluidly connected to the corresponding first fluid port or fluid ports of the hydraulic displacement unit or units to which the high pressure accumulator is fluidly connected; an output shaft; wherein the first hydraulic displacement unit is drivingly engaged or selectively drivingly engaged with the output shaft, and wherein the second hydraulic displacement unit is drivingly engaged or selectively drivingly engaged with the output shaft; wherein the control valves are configured to selectively; fluidly connect the hydraulic pump to the first hydraulic displacement unit while fluidly disconnecting the hydraulic pump from the second hydraulic displacement unit; and
, simultaneously,fluidly connect the hydraulic accumulator assembly to the second hydraulic displacement unit while fluidly disconnecting the hydraulic accumulator assembly from first hydraulic displacement unit; wherein when the pump valve is set to the first position/configuration and the accumulator valve is set to the second position/configuration, the high pressure accumulator is fluidly connected to the first fluid ports of the first and the second hydraulic displacement unit and the low pressure accumulator is fluidly connected to the second fluid ports of the first and the second hydraulic displacement unit; wherein when the pump valve is set to the first position/configuration and the accumulator valve is set to the third position/configuration, the high pressure accumulator is fluidly connected to the second fluid ports of the first and the second hydraulic displacement unit and the low pressure accumulator is fluidly connected to the first fluid ports of the first and the second hydraulic displacement unit; wherein when the pump valve is set to the second position/configuration and the accumulator valve is set to the second position/configuration, the high pressure accumulator is fluidly connected to the first fluid port of the second hydraulic displacement unit, the low pressure accumulator is fluidly connected to the second fluid port of the second hydraulic displacement unit, and the accumulator assembly is fluidly disconnected from the first hydraulic displacement unit; wherein when the pump valve is set to the second position/configuration and the accumulator valve is set to the third position/configuration, the high pressure accumulator is fluidly connected to the second fluid port of the second hydraulic displacement unit, the low pressure accumulator is fluidly connected to the first fluid port of the second hydraulic displacement unit, and the accumulator assembly is fluidly disconnected from the first hydraulic displacement unit; wherein when the pump valve is set to the third position/configuration and the accumulator valve is set to the second position/configuration, the high pressure accumulator is fluidly connected to the first fluid port of the first hydraulic displacement unit, the low pressure accumulator is fluidly connected to the second fluid port of the first hydraulic displacement unit, and the accumulator assembly is fluidly disconnected from the second hydraulic displacement unit; and wherein when the pump valve is set to the third position/configuration and the accumulator valve is set to the third position/configuration, the high pressure accumulator is fluidly connected to the second fluid port of the first hydraulic displacement unit, the low pressure accumulator is fluidly connected to the first fluid port of the first hydraulic displacement unit, and the accumulator assembly is fluidly disconnected from the second hydraulic displacement unit.
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Specification