Denso Corporation

Denso Airs Corporation

Denso Corpora Tion

Shun Kurata

Yoshiaki Takano

Fumiaki Nakamura

Takahisa Suzuki

Satoshi Izawa

Hiroki Naganawa

Kinji Ochiai

Hiroki Ohara

Takashi Ono

Satoru Yamanashi

Koji Ito

Haruyuki Nishijima

Hikaru Sugi

Takahiro Suzuki

Toshio Morikawa

Norihisa Sasano

Toshiki Sugiyama

Manabu Miyata

Takeshi Wakisaka

Ikuo Ozawa

Yoshiyuki Yokoyama

Hiroki Matsuo

Noriaki Maeda

Tetsuji Nobuta

Makoto Yoshino

Youhei Nagano

Asuka Marumo

Yoshiharu Endo

Hiroshi Kataoka

Keisuke Nagai

Kazuya Makizono

Takeshi Miyamoto

Katsuhiko Honda

Isamu Takasugi

Hiroki Oguchi

A vehicle air conditioning device includes a compressor and a controller. The controller is configured to set an upper limit value of the rotation speed of the compressor based on a combination of whether the speed of the vehicle is lower than a predetermined speed and whether a rotation speed of a fan device for a condenser is lower than a predetermined rotation speed.

Vehicle air conditioning device

A vehicle air conditioner includes a bypass passage configured to cause a coolant to circulate while bypassing a heater core, a switching device set to switch between a first mode in which the coolant flows through the bypass passage and returns to an internal combustion engine while bypassing the heater core and a second mode in which the coolant flows to the heater core, a coolant-temperature sensor that detects a temperature of the coolant at a part through which the coolant flows in both the first mode and the second mode, and a control unit that controls an operation of a blower based on the coolant-temperature control data. Furthermore, first and second calculating portions are configured to calculate the coolant-temperature control data in the first and second modes, respectively. The first calculating portion calculates the coolant-temperature control data based on the temperature of the coolant detected at start-up of the internal combustion engine, and the second calculating portion sets, as the coolant-temperature control data, a temperature lower than the detected temperature of the coolant.

Air conditioner for vehicle

An ejector-type refrigeration cycle includes an ejector module integrated with a gas-liquid separation device. A length of an inlet pipe that connects a liquid-phase refrigerant outflow port of an ejector module to a refrigerant inflow port of an evaporator is shorter than a length of a suction pipe that connects a gas-phase refrigerant outflow port of the ejector module to a suction port of the compressor.

Ejector-type refrigeration cycle

A double-wall pipe includes an outer pipe, and an inner pipe disposed inside the outer pipe. An outer wall of the inner pipe has thereon a ridge portion, which defines a groove portion extending in a longitudinal direction of the inner pipe. The outer pipe and the inner pipe are bent to have a straight portion extending straightly, and a bend portion bent from the straight portion. In the straight portion, the outer pipe has an inside diameter that is larger than an outside diameter of an imaginary cylinder defined by an outer surface of the ridge portion of the inner pipe. Furthermore, the ridge portion of the inner pipe contacts an inside surface of the outer pipe to be radially squeezed and held by the outer pipe, in the bend portion. The double-wall pipe can be suitably used for a refrigerant cycle device.

Double-wall pipe, method of manufacturing the same and refrigerant cycle device provided with the same

In a refrigeration cycle device with a capacity-variable compressor, a preset suction pressure that serves as a target value of a refrigerant suction pressure of the compressor is calculated and a refrigerant discharge capacity of the compressor is controlled by operating a capacity varying portion such that the suction pressure of the compressor is appreciated to the preset suction pressure. A thermal load detection portion is configured to detect a thermal load of a refrigeration cycle, and a refrigerant flow amount detection portion is configured to detect a flow amount of refrigerant circulating through the refrigeration cycle. In the refrigeration cycle device, a pressure at a predetermined part of the compressor is estimated based on the thermal load detected by the thermal load detection portion and on the flow amount detected by the refrigerant flow amount detection portion.

Refrigeration cycle device for vehicle

A compound tube is disclosed that includes an outer tube and an inner tube disposed in the outer tube. A passage is defined between the outer tube and the inner tube. Various methods of joining the outer tube to the inner tube are disclosed.

Compound tube and method of producing the same

A method of manufacturing a double pipe includes a step of inserting a straight inner pipe into a straight outer pipe such that the inner pipe and the outer pipe are positioned at a predetermined relative position, a step of fixing a first end portion of the outer pipe to the inner pipe so as to form a first fixing portion, a step of bending the outer pipe and the inner pipe at the same time at a predetermined portion so as to form at least one bending portion after the fixing step of the first end portion, and a step of fixing a second end portion of the outer pipe to the inner pipe so as to form a second end portion after the bending.

Method of manufacturing double pipe

A double-wall pipe includes an outer pipe, and an inner pipe disposed inside the outer pipe. An outer wall of the inner pipe has thereon a ridge portion, which defines a groove portion extending in a longitudinal direction of the inner pipe. The outer pipe and the inner pipe are bent to have a straight portion extending straightly, and a bend portion bent from the straight portion. In the straight portion, the outer pipe has an inside diameter that is larger than an outside diameter of an imaginary cylinder defined by an outer surface of the ridge portion of the inner pipe. Furthermore, the ridge portion of the inner pipe contacts an inside surface of the outer pipe to be readially squeezed and held by the outer pipe, in the bend portion. The double-wall pipe can be suitably used for a refrigerant cycle device.

A refrigerant pipe connected to a suction side of a compressor and a refrigerant pipe connected to a discharge side of the compressor are integrated into one body. A refrigerant pipe connected to an inlet side of a condenser and a refrigerant pipe connected to an outlet side of the condenser are integrated into one body. A refrigerant pipe connected to an inlet side of a decompressor and a refrigerant pipe connected to an outlet side of the temperature detecting portion are integrated into one body. In these piping structures, a double pipe structure and a double pipe joint structure are adopted in which an inner pipe for circulating high pressure fluid and an outer pipe for circulating low pressure fluid are formed separate from each other and the respective end portions of the pipes are joined to a joint member by plastically deforming the pipes.

Vapour-compression type refrigerating machine and double pipe structure and double pipe joint structure preferably used therefor

A pipe is received through a through hole of a connector. A bulged portion of the pipe is press fitted into a recess of the connector located at a first side of the connector and a retaining member is located at a second side of the connector.

Pipe joint structure

An automotive air conditioning system comprising a main heating unitfor heating air passing through an air conditioning ductwith cooling water of an engine E and a refrigeration cycle devicehaving a first refrigerant circulating circuitwhich is a cooler mode and a second refrigerant circulating circuitwhich is a heater mode and whose operation is controlled by an ECU, wherein while the automotive air conditioning system is operated in a heater mode functioning as auxiliary heating, in the event that a heating load is equal to or larger than a predetermined value, a refrigerant compressoris kept switched off until a predetermined time Thas elapsed after the engine E has started. In addition, a heating device is provided on the refrigerant compressor or an accumulator so that the refrigerant compressor or the accumulator is heated by the heating devices while the automotive air conditioning system is operated in the heater mode functioning as auxiliary heating.

Automotive air conditioning system

A refrigeration cycle system is disclosed. Upon generation of a start signal for a hot gas heater cycle, the cooling mode is first started thereby to start the dormant refrigerant recovery mode (S) and, upon an increase in the compressor discharge pressure Pd to a predetermined setting P, the cooling mode is ended and the compressor is switched to the off mode (S, S). Upon the lapse of a predetermined time ta in the off mode, the off mode is ended (S) and the heating mode with the hot gas heater cycle is started.

Refrigeration cycle system

In a vehicle air conditioner having front and rear air conditioning units, a refrigerant cycle includes front and rear evaporators for cooling air in a cooling mode, a hot-gas bypass passage through which hot-gas refrigerant discharged from a compressor flows into the front evaporator while bypassing a condenser in a heating mode, and a fixed throttle between the condenser and the front evaporator for decompressing refrigerant flowing from the condenser in the cooling mode. Further, a refrigerant outlet side of the fixed throttle and a refrigerant outlet side of the hot-gas bypass passage are joined to a refrigerant pipe, and a refrigerant outlet of the refrigerant pipe is connected to a refrigerant inlet of the front evaporator. Therefore, a refrigerant pipe structure of the refrigerant cycle can be made simple.

Vehicle air conditioner with front and rear air conditioning units

A vehicle air-conditioning system of a dual air-conditioner type exhibiting a hot gas heater function, which is designed to efficiently recover not only dormant refrigerant at the heater side, but also dormant refrigerant at the rear seat evaporator, which system sets the refrigeration cycle to a cooling mode and engages in a refrigerant recovery operation when starting up the heating mode by a hot gas heater cycle, then switches the refrigeration cycle to the heating mode, sets the front seat air-conditioning unit to the outside air mode at the time of the heating mode to blow outside air to the front seat evaporator by the front seat blower, then, when judging that the inside air temperature is high due to the refrigerant temperature of the rear seat evaporator at the time of the heating mode, operates the rear side blower to blow inside air to the rear seat evaporator.

Vehicle air-conditioning system

In the air conditioner of the present invention, both the normal cooling mode operation, in which refrigerant discharged from the compressoris made to flow in the condenser, and the heating mode operation conducted by the hot gas bypass, in which refrigerant is made to bypass the condenser and directly flow in the evaporatorvia the throttle, can be conducted. Before this heating mode operation, after the compressor is turned on for a predetermined period of time in the cooling mode, the compressor is turned off for a predetermined period of time, so that refrigerant residing in the condenser can be recovered into the hot gas cycle, and then a hot gas operation, which is the heating mode, is conducted.

Growing community of inventors

Kariya, Japan

Shun Kurata