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AssigneeRobert Bosch GmbH
InventorsHerwig Koppauer, Andreas Kugi, Wolfgang Kemmetmueller, Christian Fleck, Matthias Bitzer, Adrian Trachte, Carolina Passenberg, Derya Lindenmeier, Thomas Specker
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The invention relates to a control circuit (27) for a waste heat recovery system (2) for a heat engine (36). The waste heat recovery system (2) comprises at least one evaporator (21) for converting waste heat from the exhaust gas (31, 31a) generated by the heat engine (36) into a working medium (23), at least one expansion machine (24) which can be driven by the working medium (23), at least one condenser (25) for condensing the working medium (23a) expanded in the expansion machine (24) into the liquid state (23b), and at least one conveying device (26) for increasing the pressure of the condensed working medium (23b) and conveying same into the evaporator (21). The control circuit (27) influences at least one control variable which controls the energy transmission from the exhaust gas (31, 31a) to the working medium (23b) and/or the energy transmission from the working medium (23c) to the expansion machine (24). The control circuit (27) is designed to regulate the specific enthalpy hW and/or the temperature TW of the working medium (23c) entering the expansion machine (24) to a target value hW,S, TW,S, wherein the target value hW,S, TW,S depends on the pressure pW of the working medium (23c) entering the expansion machine (24). The invention also relates to a waste heat recovery system (2) for an internal combustion engine of a vehicle (3) in the form of a heat engine (36) comprising the control circuit (27) and to a corresponding computer program.
A control circuit (27) for a waste heat recovery system (2) for a heat engine (36), wherein the waste heat recovery system (2) comprises at least one evaporator (21) for converting waste heat from exhaust gas (31, 31a) generated by the heat engine (36) into a working medium (23), at least one expansion machine (24), which can be driven by the working medium (23), at least one condenser (25) for condensing the working medium (23a) expanded in the expansion machine (24) into a liquid state (23b) and at least one delivery device (26) for increasing a pressure of the condensed working medium (23b) and delivering it into the evaporator (21), wherein the control circuit (27) controls at least one control variable which controls (a) an energy transfer from the exhaust gas (31, 31a) to the working medium (23b), (b) an energy transfer from the working medium (23c) to the expansion machine (24), or both (a) and (b), wherein the control circuit (27) is configured to regulate a specific enthalpy hW, a temperature TW, or both the specific enthalpy hW and the temperature TW of the working medium (23c) entering the expansion machine (24) to a set value hW,S, TW,S, or to set values hW,S and TW,S, wherein the set value hW,S, TW,S, or both, as applicable, depends on the pressure pW of the working medium (23c) entering the expansion machine (24), and a prediction module (28a) is provided, which is designed to precalculate a future development of the specific enthalpy hW, of the temperature TW or the pressure pW, on the basis of a model (2a) and at least one set of state variables of the waste heat recovery system (2).
A non-transitory, computer-readable medium, containing instructions which, when run on a computer, cause the computer to control a waste heat recovery system (2) for a heat engine (36), wherein the waste heat recovery system (2) comprises at least one evaporator (21) for converting waste heat from exhaust gas (31, 31a) generated by the heat engine (36) into a working medium (23), at least one expansion machine (24), which can be driven by the working medium (23), at least one condenser (25) for condensing the working medium (23a) expanded in the expansion machine (24) into a liquid state (23b) and at least one delivery device (26) for increasing pressure of the condensed working medium (23b) and delivering it into the evaporator (21), wherein the control circuit (27) controls at least one control variable which controls (a) energy transfer from the exhaust gas (31, 31a) to the working medium (23b), (b) the energy transfer from the working medium (23c) to the expansion machine (24), or both (a) and (b), by
Dependencies are inferred from the claim text.