Sanden Corporation

Sanden Holdings Corporation

Junichiro Kasuya

Hiroyuki Nagai

Shinji Nakamura

Hirofumi Wada

Yasuaki Kanou

Masaaki Tokuda

Syou Ishii

Tetsuya Nakano

Tomohiko Saito

Satoshi Ogiwara

Takahiro Takei

Kou Tsukamoto

The heating capacity particularly at low outside air temperatures in a vehicular air-conditioning unit that heats the vehicle interior by heat pump operation of a refrigerant circuit using a compressor is improved. During heating, a refrigerant discharged from a compressorreleases heat in a radiatorinto the vehicle interior, and the refrigerant decompressed after the heat release in the radiator evaporates in at least one of an external heat exchangerand a ventilation heat exchanger. During cooling, the refrigerant discharged from the compressor releases heat in the external heat exchanger, and the refrigerant decompressed after the heat release in the external heat exchanger evaporates in an internal heat exchangerto absorb heat from the vehicle interior. The vehicular air-conditioning unit includes a hot gas cycle circuitfor decompressing a part of the refrigerant discharged from the compressor, and causing the decompressed part of the refrigerant to flow through the internal heat exchanger to release heat into the vehicle interior.

Vehicular air-conditioning unit

Control means () that controls the actuation of Rankine cycle () is provided. An evaporator () is capable of absorbing heat from the waste heat of the internal combustion engine () with an upper limit of preset maximum heat absorption amount and transferring the heat to working fluid. The control means () controls the flow rate of the working fluid so that the working fluid evaporated by the evaporator () comes into a superheated state in a heater (), when the working fluid enters the evaporator () at a flow rate equal to or lower than preset flow rate at which the working fluid can absorb the preset maximum heat absorption amount of heat, and controls the flow rate of the working fluid so that the working fluid that overflows the evaporator () is evaporated by the heater () and then comes into the superheat state, when the working fluid enters the evaporator () at a flow rate higher than the preset flow rate.

Waste heat utilization device for internal combustion engine

A unitary-side heat pump unit is configured so that a refrigerant circulates sequentially through a first compressor, a first heat exchanger, a cascade heat exchanger, a first expansion valve and an evaporator, and heat exchange with heat media of a heating unit is carried out in the first heat exchanger; a binary-side heat pump unit is configured so that a refrigerant circulates sequentially through a second compressor, a second heat exchanger, a second expansion valve and a cascade heat exchanger, and heat exchange with heat media of the heating unit is carried out in the second heat exchanger; the refrigerants of the unitary-side and binary-side heat pump units include carbon dioxide (CO) as a main component; and high pressure-side sections of the unitary-side and binary-side heat pump units are activated within substantially identical pressure ranges of supercritical pressure.

Heat pump-type heating device

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

A Rankine circuit () includes, as a plurality of heat exchangers, an EGR cooler () of an EGR circuit and an exhaust gas heat exchanger () associated with an exhaust passage. The EGR cooler and the exhaust gas heat exchanger are arranged such that the EGR cooler is located upstream of the exhaust gas heat exchanger as viewed in the flowing direction of a working fluid in the Rankine circuit. The amount of heat transferred from EGR gas to the working fluid in the EGR cooler is controlled by a control unit () so that the temperature of the EGR gas detected by an EGR gas temperature detector () may fall within a predetermined temperature range (e.g., 150&#xb0; C. to 200&#xb0; C.).

Waste heat utilization apparatus for internal combustion engine

A Rankine cycle () of a waste heat utilization device includes a circulation path () for circulating a working fluid therethrough, an evaporator () for causing heat to transfer from cooling water delivered from an internal combustion engine () to the working fluid to evaporate the working fluid, a superheater () for causing heat to transfer from the cooling water delivered from an exhaust gas heat exchanger () to the working fluid delivered from the evaporator to superheat the working fluid, an expander () for expanding the working fluid delivered from the superheater to produce driving force, a condenser () for condensing the working fluid delivered from the expander, and a pump () for feeding the working fluid delivered from the condenser to the evaporator. The evaporator, the superheater, the expander, the condenser and the pump are successively inserted in the working fluid circulation path.

A waste heat utilization device recovering waste heat produced by an internal combustion engine from a heat medium includes a Rankine cycle circuit including an evaporator, an expander, a condenser and a pump serially arranged in a circulation line along which a combustible working fluid circulates. A casing air-tightly encloses the Rankine cycle circuit to chemically inactivate the Rankine cycle circuit.

A waste heat recovery system of an internal combustion engine, in which regenerative energy transmitted to the internal combustion engine is increased with a simple mechanism. A controller of the waste heat recovery system of an internal combustion engine makes a determination as to whether it is necessary to increase the pressure of heat-transfer media in a heat exchanger, on the basis of the pressure detected by the high-pressure sensor. When it is necessary to increase the pressure in the heat exchanger, the controller causes a flow-rate regulating valve to start regulating the flow rate of the heat-transfer media while leaving the pump working. The controller causes the flow-rate regulating valve to continue the regulation at least until it is not necessary to increase the pressure in the heat exchanger, and then terminates the regulation.

Waste heat recovery system of internal combustion engine

In a refrigerating open showcase comprising a showcase body whose top surface is open; an inner plate disposed to form an air passage between the inner plate and the showcase body; and a cooler disposed in the air passage, in which an air curtain is formed on the top surface of the showcase body by causing air having been cooled in the air passage to flow from a discharge port to a suction port, the upper end of the inner plate on the suction port side is bent toward the air passage on the suction side, and the upper face of the bent portion is inclined slightly with respect to the horizontal in the direction that the upper face of said bent portion faces a side wall on the suction port side of the showcase body.

Growing community of inventors

Isesaki, Japan

Junichiro Kasuya