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AssigneeRobert Bosch GmbH
InventorsFrank Heber, Manfred Schmitt, Mathias Kurras
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The invention relates to a waste-heat utilization assembly (1) of an internal combustion engine (50), comprising a circuit (2) that conducts a working medium, wherein a pump (6), a distribution valve block (7), two evaporators (10, 11), an expansion machine (3), and a condenser (4) are arranged in the circuit (2) in the flow direction of the working medium. The two evaporators (10, 11) are arranged in a parallel connection, and the parallel connection begins at the distribution valve block (7) and ends at a node point (8). A temperature sensor (21) for determining the outlet temperature of the working medium at the expansion machine (3) is arranged between the expansion machine (3) and the condenser (4).
A method for operating a waste-heat utilization arrangement (1) of an internal combustion engine (50) having a circuit (2) which conducts a working medium, wherein a pump (6), at least one evaporator (10, 11), an expansion machine (3) and a condenser (4) are arranged in the circuit (2) in a flow direction of the working medium, wherein an outlet temperature (T21) from the expansion machine (3) is determined between the expansion machine (3) and the condenser (4), wherein a control unit (60) regulates the pump (6) as a function of the outlet temperature (T21) from the expansion machine (3) such that the outlet temperature (T21) lies above the condensation temperature (TK) of the working medium only by an optimized temperature difference (ΔT), wherein the optimized temperature difference (ΔT) is less than 25 K, wherein the at least two evaporators (10, 11) are arranged in a parallel circuit between a distributor valve block (7) and a junction (8), characterized in that an inlet pressure (p20) of the working medium into the expansion machine (3) is determined between the junction (8) and the expansion machine (3), wherein the distributor valve block (7) divides the mass flow of the working medium between the at least two evaporators (10, 11), and wherein the control unit (60) controls and regulates the distributor valve block (7) as a function of the inlet pressure (p20) of the working medium into the expansion machine (3), such that the inlet pressure (p20) is maximized.
A method for operating a waste-heat utilization arrangement (1) of an internal combustion engine (50) having a circuit (2) which conducts a working medium, wherein a pump (6), at least one evaporator (10, 11), an expansion machine (3) and a condenser (4) are arranged in the circuit (2) in a flow direction of the working medium, wherein an outlet temperature (T21) from the expansion machine (3) is determined between the expansion machine (3) and the condenser (4), wherein a control unit (60) regulates the pump (6) as a function of the outlet temperature (T21) from the expansion machine (3) such that the outlet temperature (T21) lies above the condensation temperature (TK) of the working medium only by an optimized temperature difference (ΔT), wherein the optimized temperature difference (ΔT) is less than 25 K, wherein the at least two evaporators (10, 11) are arranged in a parallel circuit between a distributor valve block (7) and a junction (8), characterized in that an inlet pressure (p22) of the working medium into the at least two evaporators (10, 11) is determined between the pump (6) and the at least two evaporators (10, 11), wherein the distributor valve block (7) divides the mass flow of the working medium between the at least two evaporators (10, 11), and wherein the control unit (60) controls and regulates the distributor valve block (7) as a function of the inlet pressure (p22) of the working medium into the at least two evaporators (10, 11) such that the inlet pressure (p22) is maximized.
Dependencies are inferred from the claim text.