A waste heat utilization device (2) for an internal combustion engine has a Rankine cycle (8) that recovers waste heat from an internal combustion engine (4), a generator (30) that is rotationally driven by an expander (14) and converts a rotational drive force into electric power, a converter (32) that controls the rotational speed of the expander (14) through the generator (30), refrigerant-condition detecting means (22, 24, 26, 28) that detects the pressure and temperature of a refrigerant passing through the expander (14), and a controller (34) that calculates pressure ratio Rp of the refrigerant in the immediate upstream and downstream of the expander (14) and specific heat ratio K of the refrigerant passing through the expander (14) on the basis of the pressure and temperature of the refrigerant, which have been detected by the refrigerant-condition detecting means (22, 24, 26, 28), calculates a preset pressure ratio Rps of the pressure ratio Rp by multiplying predetermined volume ratio Rv of the expander (14) by the specific heat ratio K, and specifies rotational speed N of the expander (14) to the converter (32) on the basis of the pressure ratio Rp and the preset pressure ratio Rps.

Waste Heat Utilization Device for Internal Combustion Engine

The waste heat recovery system includes a Rankine cycle device in which working fluid circulates through a pump, a boiler, an expander and then through a heat exchanging device, heat exchange occurs in the boiler between the working fluid and intake fluid that is introduced into an internal combustion engine while being cooled. The heat exchanging device includes a condenser condensing the working fluid, a receiver connected downstream of the condenser and storing liquid-phase working fluid, a subcooler connected downstream of the receiver and subcooling the liquid-phase working fluid, and a selector device serving to change the ratio of the condenser to the subcooler. The waste heat recovery system further includes a determination device for determining required cooling load for the intake fluid, and a controller for controlling the selector device depending on the required cooling load determined by the determination device.

Waste heat recovery system

A waste heat regeneration system for a vehicle having a vehicle engine actuated by a start-stop switch includes Rankine cycle circuit, a motor generator, a by-pass circuit and a control device. The Rankine cycle circuit includes a pump, a boiler heating the heat medium by heat exchanging with waste heat generated by the vehicle engine, an expansion device and a condenser. The by-pass circuit is connected to the Rankine cycle circuit at the upstream and downstream sides of the condenser and the communication of the heat medium is openable and closable therethrough. When the start-stop switch of the vehicle engine is turned off, the control device controls the by-pass circuit to communicate the heat medium therethrough and keeps controlling of the rotational speed of the motor generator until pressure difference between the upstream and downstream of the expansion device is decreased to a predetermined level, and then stops the control.

Waste heat regeneration system

A Rankine cycle waste heat recovery system associated with an internal combustion engine is in a configuration that enables handling of exhaust gas recirculation (EGR) gas by using the energy recovered from a Rankine cycle waste heat recovery system. The system includes a control module for regulating various function of the internal combustion engine and its associated systems along with the Rankine cycle waste heat recovery system.

Rankine cycle waste heat recovery system

A waste heat recovery system for use with an engine. The waste heat recovery system receives heat input from both an exhaust gas recovery system and exhaust gas streams. The system includes a first loop and a second loop. The first loop is configured to receive heat from both the exhaust gas recovery system and the exhaust system as necessary. The second loop receives heat from the first loop and the exhaust gas recovery system. The second loop converts the heat energy into electrical energy through the use of a turbine.

Waste heat recovery system with constant power output

PROBLEM TO BE SOLVED: To provide a waste heat using device of an internal combustion engine capable of largely improving the energy recovery efficiency in the waste heat using device. SOLUTION: This waste heat using device of the internal combustion engine has a cooling water circuit 4 having a radiator 12 for cooling cooling water heated by waste heat of the internal combustion engine 2 by outside air, a Rankine cycle 6 having a first condenser 24 for condensing a refrigerant by ventilation of the outside air, and a refrigerating cycle 8 having a second condenser 36 for condensing the refrigerant by the ventilation of the outside air. A heat exchange unit 48 is constituted by mutually superposing the second condenser, the first condenser and the radiator in order from the ventilation direction of the outside air with a predetermined clearance D 1 and D 2 . The heat exchange unit has a blocking-up plate 52 for blocking up the first clearance D 1 between the first condenser and the radiator in the ventilation direction of the outside air. COPYRIGHT: (C)2009,JPO&INPIT

Waste heat-using device for internal combustion engine

A Rankine circuit (40) is equipped with multiple heat exchangers, i.e., an EGR cooler (36) arranged in an EGR circuit and an exhaust gas heat exchanger (41) arranged in a gas discharge passage, wherein the EGR cooler and the exhaust gas heat exchanger are so arranged that the EGR cooler is located upstream from the exhaust gas heat exchanger when observed in the direction of flow of a working fluid in the Rankine circuit, and wherein the amount of heat exchanged between an EGR gas and the working fluid in the EGR cooler is controlled by a control means (60) so that the temperature of the EGR gas which is detected by an EGR gas temperature detection means (39) falls within a predetermined temperature range (e.g., 150-200°C).

Waste heat utilization apparatus for internal combustion engine

A Rankine circuit (40) is equipped with multiple heat exchangers, i.e., an EGR cooler (36) arranged in an EGR circuit and an exhaust gas heat exchanger (41) arranged in a gas discharge passage, wherein the EGR cooler and the exhaust gas heat exchanger are so arranged that the EGR cooler is located upstream from the exhaust gas heat exchanger when observed in the direction of flow of a working fluid in the Rankine circuit, and wherein the amount of heat exchanged between an EGR gas and the working fluid in the EGR cooler is controlled by a control means (60) so that the temperature of the EGR gas which is detected by an EGR gas temperature detection means (39) falls within a predetermined temperature range (e.g., 150-200˚C).

Apparatus for utilizing waste heat from internal combustion engine

A waste heat utilization device (2) for an internal combustion (6) comprises a heat medium circuit (8) in which a heat medium which is allowed to take on waste heat by at least any one of the internal combustion (6) and a heat source member of the internal combustion (6) is circulated according to the operation of the internal combustion (6) and a Rankine cycle circuit (4) which comprises heating units (10, 12) for exchanging heat with at least one of the heat medium and the heat source member and heating an operating fluid, an expansion device (14) for expanding the operating fluid routed through the heating units (10, 12) and generating driving force, and a condenser (16)for condensing the operating fluid routed through the expansion device (14) and in which the operating fluid routed through the condenser (16) is circulated through the heating units (10, 12). The waste heat utilization device controls the flow rate of at least any one of the heat medium and the heat source member which exchange heat with the operating fluid in the heating units (10, 12) according to the operation of the internal combustion (6).

Yasuaki Kanou

Papers

Waste Heat Utilization Device for Internal Combustion Engine

Waste heat-using device for internal combustion engine

Waste heat utilization apparatus for internal combustion engine

Apparatus for utilizing waste heat from internal combustion engine

Waste heat utilization device for internal combustion