Waste heat recovery apparatus and method for controlling waste heat recovery apparatus
First Claim
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1. A waste heat recovery apparatus comprising:
- an evaporator configured to turn a liquid-phase refrigerant into steam through heat exchange with exhaust gas of an internal combustion engine;
an expander configured to expand a gas-phase refrigerant passed through the evaporator to recover heat energy;
a condenser configured to condense the gas-phase refrigerant passed through the expander such that the gas-phase refrigerant returns to the liquid-phase refrigerant;
a liquid-phase refrigerant supply device, that is a first pump, configured to supply the liquid-phase refrigerant delivered from the condenser, to the evaporator; and
a control device, comprising a processor, configured to control the liquid-phase refrigerant supply device so as to adjust an amount of the liquid-phase refrigerant to be supplied to the evaporator,wherein the control device is configured to start supply of the liquid-phase refrigerant by the liquid-phase refrigerant supply device based on the internal combustion engine, that operates while the supply of the liquid-phase refrigerant by the liquid-phase refrigerant supply device is in a continued stopped state, being stopped.
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Abstract
A waste heat recovery apparatus includes an evaporator, an expander, a condenser, a liquid-phase refrigerant supply device, and a control device. The control device is configured to control the liquid-phase refrigerant supply device so as to bring the supply of the liquid-phase refrigerant by the liquid-phase refrigerant supply device into a stopped state at least until an amount of the liquid-phase refrigerant stored in the evaporator becomes equal to or lower than a predetermined low refrigerant amount, during operation of the internal combustion engine.
5 Citations
9 Claims
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1. A waste heat recovery apparatus comprising:
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an evaporator configured to turn a liquid-phase refrigerant into steam through heat exchange with exhaust gas of an internal combustion engine; an expander configured to expand a gas-phase refrigerant passed through the evaporator to recover heat energy; a condenser configured to condense the gas-phase refrigerant passed through the expander such that the gas-phase refrigerant returns to the liquid-phase refrigerant; a liquid-phase refrigerant supply device, that is a first pump, configured to supply the liquid-phase refrigerant delivered from the condenser, to the evaporator; and a control device, comprising a processor, configured to control the liquid-phase refrigerant supply device so as to adjust an amount of the liquid-phase refrigerant to be supplied to the evaporator, wherein the control device is configured to start supply of the liquid-phase refrigerant by the liquid-phase refrigerant supply device based on the internal combustion engine, that operates while the supply of the liquid-phase refrigerant by the liquid-phase refrigerant supply device is in a continued stopped state, being stopped. - View Dependent Claims (2, 3, 4, 5, 8)
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6. A waste heat recovery apparatus comprising:
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an evaporator configured to turn a liquid-phase refrigerant into steam through heat exchange with exhaust gas of an internal combustion engine; an expander configured to expand a gas-phase refrigerant passed through the evaporator to recover heat energy; a condenser configured to condense the gas-phase refrigerant passed through the expander such that the gas-phase refrigerant returns to the liquid-phase refrigerant; a liquid-phase refrigerant supply device, that is a first pump, configured to supply the liquid-phase refrigerant delivered from the condenser, to the evaporator; and a control device, comprising a processor, configured to control the liquid-phase refrigerant supply device so as to adjust an amount of the liquid-phase refrigerant to be supplied to the evaporator, wherein the liquid-phase refrigerant supply device, that is the first pump, pumps the liquid-phase refrigerant delivered from the condenser to the evaporator; the control device is configured to stop supply of the liquid-phase refrigerant by stopping operation of the first pump; the control device is configured to operate the first pump during operation of the internal combustion engine and in a case where the amount of the liquid-phase refrigerant stored in the evaporator becomes equal to or lower than a predetermined amount; the control device is configured to calculate an amount of a refrigerant needed to bring the amount of the liquid-phase refrigerant stored in the evaporator into a full amount as a target refrigerant amount; and the control device is configured to control the operation of the first pump with the target refrigerant amount as an upper limit.
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7. A waste heat recovery apparatus comprising:
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an evaporator configured to turn a liquid-phase refrigerant into steam through heat exchange with exhaust gas of an internal combustion engine; an expander configured to expand a gas-phase refrigerant passed through the evaporator to recover heat energy; a condenser configured to condense the gas-phase refrigerant passed through the expander such that the gas-phase refrigerant returns to the liquid-phase refrigerant; a liquid-phase refrigerant supply device, that is a first pump, configured to supply the liquid-phase refrigerant delivered from the condenser, to the evaporator; a control device, comprising a processor, configured to control the liquid-phase refrigerant supply device so as to adjust an amount of the liquid-phase refrigerant to be supplied to the evaporator; a heat exchanger that performs heat exchange between the liquid-phase refrigerant passed through the first pump, and an engine coolant passed through the internal combustion engine; and a second pump that pumps the engine coolant to the heat exchanger, wherein the liquid-phase refrigerant supply device, that is the first pump, pumps the liquid-phase refrigerant delivered from the condenser to the evaporator; the control device is configured to stop supply of the liquid-phase refrigerant by stopping operation of the first pump; and the control device is configured to operate the second pump in a case where the first pump is operated and in a case where a temperature of the engine coolant is higher than a temperature of the liquid-phase refrigerant passed through the first pump.
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9. A method for controlling a waste heat recovery apparatus including an evaporator, an expander, a condenser, and a liquid-phase refrigerant supply device that is a first pump, the evaporator being configured to turn a liquid-phase refrigerant into steam through heat exchange with exhaust gas of an internal combustion engine, the expander being configured to expand a gas-phase refrigerant passed through the evaporator to recover heat energy, the condenser being configured to condense the gas-phase refrigerant passed through the expander to return the condensed gas-phase refrigerant to the liquid-phase refrigerant, and the liquid-phase refrigerant supply device being configured to supply the liquid-phase refrigerant delivered from the condenser, to the evaporator, the method comprising:
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adjusting an amount of the liquid-phase refrigerant to be supplied to the evaporator by controlling the liquid-phase refrigerant supply device; starting supply of the liquid-phase refrigerant by the liquid-phase refrigerant supply device based on the internal combustion engine, that operates while the supply of the liquid-phase refrigerant by the liquid-phase refrigerant supply device is in a continued stopped state, being stopped.
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Specification