摘要:
PROBLEM TO BE SOLVED: To provide a refrigeration cycle device for a vehicle capable of exerting highly accurate detection of gas shortage with a simple configuration. SOLUTION: In this refrigeration cycle for the vehicle, an air-conditioner ECU 100 estimates coolant pressure corresponding to temperature detected by a temperature sensor 84 on the downstream of an evaporator as first intake side coolant pressure, estimates second intake side coolant pressure by computing to satisfy an expression (expression 1: A×ΔPd+B×ΔPdc+Fspr=Fsol) for force balance affecting a valve body 51 taking discharge side coolant pressure detected by a discharge pressure sensor 86 as Pd, coolant different pressure detected by a flow rate sensor 40 as ΔPd, and control current driving the valve body 51 as Ic, and determines the gas shortage of the coolant when an absolute valve of the difference between an estimated value Ps1 of the first intake side coolant pressure and an estimated value Ps2 of the second intake side coolant pressure is the predetermined value or more. In the expression (expression 1), Fsol is upward electromagnetic force in the drawing affected to the valve body 51 by a movable iron core 53b by excitation to a coil 53c, A×ΔPd is downward pressing force in the drawing based on the different pressure ΔPd affected to the valve body 51 by a bellows 52b, and A is a section area of the bellows 52b affected by the different pressure ΔPd. B×ΔPdc is downward pressing force in the drawing based on the different pressure ΔPdc between a discharge chamber 9 and a crank chamber 16, and B is a section area of the valve body 51 affected by the different pressure ΔPdc. Fspr is downward supporting force in the drawing based on the predetermined spring force of the bellows 52b. COPYRIGHT: (C)2009,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To inhibit deviation of estimation drive torque from actual compressor drive torque under a transient condition right after compression start of a variable displacement compressor. SOLUTION: First estimation drive torque calculation means S41 to S45 determine estimation response time Ts from start of compression of the variable displacement compressor to start of increase of compressor drive torque, and degree of increase per unit time ΔTrkA after start of increase of compressor drive torque based on delivery refrigerant pressure Pd and evaporator blow out air temperature Te at a time of compression start of the variable displacement compressor, and calculate first estimation drive torque TrkA. Moreover, a second estimation drive torque calculation means S46 calculates second estimation drive torque TrkB based on delivery refrigerant pressure Pd and estimation drive torque determination means S47 to S49 define smaller one of TrkA and TrkB as estimation drive torque STrk. COPYRIGHT: (C)2008,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle using a refrigerating cycle of carbon dioxide refrigerant which does not need to map and maintain data for controlling an ECV, with its start-up time corresponding to a load. SOLUTION: This air conditioner is composed of: at least a compressor 101; the ECV 107 for controlling the discharge capacity of the compressor 101 according to a duty value provided from the outside; an outdoor heat exchanger 102; a decompressor 103; an indoor heat exchanger 104; a compressor discharge pressure sensor 110 for detecting a discharge pressure of the refrigerant discharged from compressor 101; and a control amplifier 111 providing to the ECV 107 a duty value corresponding to a detected value from this compressor pressure sensor 110. The control amplifier 111 is so constructed as to increase and decrease the duty value until the duty value to be provided to the ECV 107 becomes the maximum one while the detected value of the compressor discharge pressure sensor 110 is made not to exceed a predetermined range. COPYRIGHT: (C)2007,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle capable of preventing a compressor from being constantly driven with its maximum capacity during acceleration, avoiding excessive power consumption of the compressor during acceleration, attaining high acceleration of the vehicle and low fuel consumption, and maintaining comfort of an occupant by restraining an excessive increase in blowout temperature in a vehicle inside. SOLUTION: In this air conditioner including a refrigerating cycle having the variable displacement compressor equipped with a capacity control valve which controls a discharge amount of the compressor so that a pressure difference Pd-Ps between a discharge refrigerant pressure Pd and a suction refrigerant pressure Ps of the compressor may become a predetermined value, an acceleration state detector, and an engine speed detector, the discharge amount of the compressor is controlled by the capacity control valve so that the pressure difference Pd-Ps may not become larger than the pressure difference Pd-Ps right before a large compressor load when the compressor load gets large by judging that the compressor load is large if the acceleration state is detected or if the engine speed is more than the predetermined value. COPYRIGHT: (C)2006,JPO&NCIPI
摘要:
PROBLEM TO BE SOLVED: To provide a compressor control device capable of improving running fuel economy by optimally controlling compressor torque according to the load condition of an engine in normal running. SOLUTION: The compressor control device is equipped with a variable displacement compressor, an engine speed detection means, a torque target value reference means referring the engine output torque target value calculated by an accelerator depressing amount detection means or an engine ECU, and an engine output estimation means estimating the present engine output torque from at least the accelerator depressing amount or the engine output torque target value and the engine speed. The compressor control device determines a compressor torque limit value from the engine output torque and the engine speed by using a torque limit value map of the map defining the compressor torque limit value especially on the two-axis plane of the engine output torque and the engine speed. COPYRIGHT: (C)2005,JPO&NCIPI
摘要:
PROBLEM TO BE SOLVED: To reduce a feel of noise sensed by a user when heating is carried out by hot gas. SOLUTION: High pressure is controlled so that the high pressure comes to be larger when the air blasting quantity is large in comparison with the time when air blasting quantity is small. Consequently, it becomes hard to hear refrigerant passing noise as the refrigerant passing noise is drowned out by air blasting noise. Additionally, in general, larger heating capacity is required when the air blasting quantity is large, and reversely, large heating performance is not required at the time when the air blasting quantity is small, and accordingly, it is possible to reduce the feel of the noise due to the refrigerant feel noise when the user senses at the time when the heating is carried out by the hot gas without spoiling the heating feel by controlling the high pressure in accordance with the air blasting quantity. COPYRIGHT: (C)2005,JPO&NCIPI