Abstract:
A rotary seal arrangement for use with a central tire inflation system is provided. The rotary seal arrangement comprises a stationary portion, a rotating portion, a first sealing ring, a second sealing ring, and a first bushing portion. The stationary portion defines a first air passage therethrough and the rotating portion defines a second air passage therethrough. The first sealing ring and the second sealing ring are each disposed on one of the rotating portion and the stationary portion. The first bushing is disposed on one of the rotating portion and the stationary portion. The first bushing is in dynamic sealing engagement with the first sealing ring. The stationary portion, the rotating portion, the first sealing ring, and the second sealing ring form a sealed cavity that facilitates fluid communication between the first air passage and the second air passage.
Abstract:
The invention relates to a series hydraulic hybrid system (1) for a vehicle, comprising: a hydraulic circuit (2) comprising a first hydraulic displacement unit (5) in fluid communication with a second hydraulic displacement unit (6), the first hydraulic displacement unit (5) drivingly engaged or selectively drivingly engaged with a power source (9); a hydraulic working assembly (3) comprising a hydraulic implement (15) and a hydraulic working pump (14) in fluid communication with the hydraulic implement (15), the hydraulic working pump (14) drivingly engaged or selectively drivingly engaged with the power source (9); and a hydraulic accumulator assembly (4) comprising a high pressure hydraulic accumulator (4a) and a low pressure hydraulic accumulator (4b), the hydraulic accumulator assembly (4) selectively fluidly connected to the hydraulic circuit (2) and the hydraulic accumulator assembly (4) selectively fluidly connected to the hydraulic working assembly (3).
Abstract:
The invention relates to a series hydraulic hybrid system (1) for a vehicle, comprising: a hydraulic circuit (9) comprising a first hydraulic displacement unit (2) in fluid communication with a second hydraulic displacement unit (3); and a high pressure hydraulic accumulator (10) in fluid communication with the hydraulic circuit (9) and a low pressure hydraulic accumulator (11) in fluid communication with the hydraulic circuit (9); wherein the high pressure hydraulic accumulator (10) is in fluid communication with the hydraulic circuit (9) through a proportional flow control valve (500), the proportional flow control valve (500) being adapted to continuously vary a flow of hydraulic fluid between the high pressure hydraulic accumulator (10) and the hydraulic circuit (9).
Abstract:
The invention relates to a method of charging a hydro-pneumatic energy storage system (1), the system (1) comprising a first hydro-pneumatic accumulator (2a) comprising a first hollow vessel (5a) and, disposed within the first hollow vessel (5a), a first compressible volume (7a) containing a first amount of gas, and the system (1) comprising a second hydro-pneumatic accumulator (2b) comprising a second hollow vessel (5b) and, disposed within the second hollow vessel (5b), a second compressible volume (7b) containing a second amount of gas, the method comprising the steps of: pre-pressurizing the gas contained in the first volume (7a) to a first hydrostatic pre-charge pressure and pre-pressurizing the gas contained in the second volume (7b) to a second hydrostatic pre-charge pressure, the second pre-charge pressure being higher than the first pre-charge pressure; pressurizing the gas in the first volume (7a) by discharging a non-compressible hydraulic fluid into the first vessel (5a) (5a) while keeping a quantity of non-compressible hydraulic fluid contained in the second vessel (5b) (5b) constant to keep the pressure of the gas contained in the second volume (7b) at the second pre-charge pressure; and, when the pressure of the gas in the first volume (7a) reaches the second pre-charge pressure, pressurizing the gas in the second volume (7b) by discharging a non-compressible hydraulic fluid into the second vessel (5b) (5b). The invention further relates to a method of discharging a hydro-pneumatic energy storage system (1) and to a hydro-pneumatic energy storage system (1) for carrying out the proposed charging and discharging methods.
Abstract:
The invention relates to a series hydraulic hybrid system (1) for a vehicle, comprising: a hydraulic circuit (9) comprising a first hydraulic displacement unit (2) in fluid communication with a second hydraulic displacement unit (3), the first hydraulic displacement unit (2) drivingly engaged with an internal combustion engine (4); a high pressure hydraulic accumulator (10) and a low pressure hydrau- lie accumulator (11) selectively fluidiy connected to the hydraulic circuit (9) through at least one accumulator valve (14, 15); and a control unit (12); wherein the control unit (12) is adapted to: receive an input from an operator; compute, based on the input, a requested torque and a target system pressure; compare an accumulator pressure to the target system pressure; and control, based on the outcome of the comparison, at least one of a speed of the internal combustion engine (4) and a valve state of the accumulator valve (14, 15). The invention further relates to a method of operating a series hydraulic hybrid system.
Abstract:
The invention relates to dual motor hydraulic hybrid transmission (1, 1'), comprising: a power source (2); a hydraulic circuit (3) comprising: a hydraulic pump (4) drivingly engaged or selectively drivingly engaged with the power source (2); a first hydraulic displacement unit (5) in fluid communication with the hydraulic pump (4); and a second hydraulic displacement unit (6) in fluid communication with the hydraulic pump (4); a hydraulic accumulator assembly (7) comprising a high pressure accumulator (7a) and a low pressure accumulator (7b), the hydraulic accumulator assembly (7) in fluid communication with the hydraulic circuit (3); one or more control valves (PA, PB, VHP, VLP); and an output shaft (11); wherein the first hydraulic displacement unit (5) is drivingly engaged or selectively drivingly engaged with the output shaft (11), and wherein the second hydraulic displacement unit (6) is drivingly engaged or selectively drivingly engaged with the output shaft (11); and wherein the control valves (PA, PB, VHP, VLP) are configured to selectively: fluidly connect the hydraulic pump (4) to the first hydraulic displacement unit (5) while fluidly disconnecting the hydraulic pump (4) from the second hydraulic displacement unit (6); and, simultaneously, fluidly connect the hydraulic accumulator assembly (7) to the second hydraulic displacement unit (6) while fluidly disconnecting the hydraulic accumulator assembly (7) from first hydraulic displacement unit (5).
Abstract:
The Invention relates to a series hydraulic hybrid driveline (1) for a vehicle, comprising: a power source (2); a hydraulic circuit (3) comprising a first hydraulic displacement unit (8) in fluid communication with a second hydraulic displacement unit (9), the first hydraulic displacement unit (8) drivingly engaged or selectively drivingly engaged with the power source (2); at least one accumulator valve (5a-c, 6a-c); a hydraulic accumulator assembly (4) comprising a high pressure hydraulic accumulator (4a) and a low pressure hydaulic accumulator (4b), the accumulator assembly (4) selectively fluidly connected to the hydraulic circuit (3) through the accumulator valve (5a-c, 6a-c); at least one input device (15, 16); and a control unit (7); wherein the control unit (7) is configured to: compute, based on an input command from the input device (15, 16), a total power (23) requested from the power source (2); compare the computed total power to at least one threshold power; and control, based upon the result of the comparison, a valve state of the accumulator valve (5a-c, 6a-c). The invention further relates to a method of controlling the presently proposed system.