Abstract: A hydraulic-pump flow-rate calibration system includes: a variable capacitance type hydraulic pump that supplies an operating fluid to a hydraulic actuator; a regulator that changes the dispense flow rate of the hydraulic pump according to a flow rate command signal; a flow rate detection device that detects the flow rate of the operating fluid; a control device that outputs the flow rate command signal to the regulator to control the regulator; and a calibration device that calculates an actual measurement characteristic of the dispense flow rate for the flow rate command signal, and performs, on a preset reference characteristic, calibration based on the actual measurement characteristic. The actual measurement characteristic is calculated as a result of the flow rate of the operating fluid being detected by the flow rate detection device during output of a predetermined flow rate command signal from the control device to the regulator.

Abstract: The amount of work of a work machine (11) is estimated using fuzzy logic based on the amount of operation of control units (L1) to (L4) which operate a hydraulic swing motor (16m) and cylinders (21c) to (23c). A setting signal, which sets the rotational speed of an engine (19) based on the estimated amount of work, is set using the fuzzy logic. The rotational speed of the engine (19) can be optimized according to the operator's operation intention with the control units (L1) to (L4), and energy loss of a hydraulic system can be suppressed.

Abstract: A hydraulic working machine is provided that uses a variable displacement pump and open center type flow rate control valve for a controlling a hydraulic actuator, and has a negative control throttle disposed in a center bypass oil passage to generate a negative control pressure. A hydraulic pump control system performs virtual bleed-off control for reducing the bleed-off flow rate of the center bypass oil passage, and can operate the hydraulic actuator with the same performance as an open center control. The control system includes a bypass cut valve disposed upstream from the negative control throttle to reduce flow through the center bypass oil passages, and a negative control pressure output valve that outputs a virtual negative control pressure. The control system is configured to reduce the bleed-off flow rate by operating the bypass cut valve when virtual bleed-off control is performed, and to reduce the pump flow rate by the bleed-off reduction flow rate.

Abstract: Provided are a hydraulic circuit and a work machine capable of improving an initial motion speed of a hydraulic cylinder during a contraction of the hydraulic cylinder and securing a necessary pump flow rate while hydraulic fluid is being accumulated in an accumulator. Hydraulic oil from a head side of a second boom cylinder is regenerated in a first boom cylinder and the second boom cylinder through a second control valve of a regeneration circuit. At the same time, oil from the head side of the first boom cylinder is accumulated to a first accumulator by a pressure accumulating circuit through a first control valve. The hydraulic oil supplied under pressure from a main pump is fed to a rod side of the first boom cylinder by a boom control valve. A bleed-off valve of a bleed-off circuit communicates the first control valve to a tank at the time of initial operation of the first control valve, thereby releasing hydraulic oil from the head end of the first boom cylinder to improve an initial motion speed.

Abstract: A control device for suppressing engine load fluctuation according to main pump circuit conditions, wherein an assist torque calculation task includes a target engine torque calculation task separating smooth torque components from main pump load torque and setting a minimum value of either smooth torque component or engine setting torque as target engine torque, and a subtractor calculating target assist torque based on a difference between the main pump load torque and the target engine torque, the assist torque calculation task controlling a capacity of an assist pump based on the target assist torque and controlling switching between an assist mode and a charge mode.

Abstract: To provide a control system of blowing means for construction machines that enables to prevent the loss of battery charging amount even if an engine rotation speed is low and an alternator generates less electricity. A control system 2 of blowing means for construction machines comprises a heat exchanging means, a blowing means for blowing air to the heat exchanging means, an electric driving means for driving the blowing means, a temperature detecting means for detecting temperature of fluids running through the heat exchanging means, an alternator 4 generating electricity by being driven by an engine 34, and a control means for determining an upper limit rotation speed of the electric driving means based on current generated by the alternator 4 and controlling a rotation speed of the electric driving means based on temperature detected by the temperature detecting means while the rotation speed is below the upper limit rotation speed.

Abstract: A hydraulic working machine is provided that uses a variable displacement pump and open center type flow rate control valve for a controlling a hydraulic actuator, and has a negative control throttle disposed in a center bypass oil passage to generate a negative control pressure. A hydraulic pump control system performs virtual bleed-off control for reducing the bleed-off flow rate of the center bypass oil passage, and can operate the hydraulic actuator with the same performance as an open center control. The control system includes a bypass cut valve disposed upstream from the negative control throttle to reduce flow through the center bypass oil passages, and a negative control pressure output valve that outputs a virtual negative control pressure. The control system is configured to reduce the bleed-off flow rate by operating the bypass cut valve when virtual bleed-off control is performed, and to reduce the pump flow rate by the bleed-off reduction flow rate.

Abstract: An interior/exterior covering member for an automobile having excellent sound-absorbing performance is provided. The interior/exterior covering member includes an air-permeable fiber layer 2 and a thermoplastic resin layer 3 laminated on one surface of the fiber layer 2. The melt flow rate of the thermoplastic resin is in a range of 2 g/10 min to 500 g/10 min, and a plurality of through-holes 11 penetrating the resin layer in the thickness direction is formed in the thermoplastic resin layer 3.

Abstract: Provided are a hydraulic circuit and a work machine capable of improving an initial motion speed of a hydraulic cylinder during a contraction of the hydraulic cylinder and securing a necessary pump flow rate while hydraulic fluid is being accumulated in an accumulator. Hydraulic oil from a head side of a second boom cylinder is regenerated in a first boom cylinder and the second boom cylinder through a second control valve of a regeneration circuit. At the same time, oil from the head side of the first boom cylinder is accumulated to a first accumulator by a pressure accumulating circuit through a first control valve. The hydraulic oil supplied under pressure from a main pump is fed to a rod side of the first boom cylinder by a boom control valve. A bleed-off valve of a bleed-off circuit communicates the first control valve to a tank at the time of initial operation of the first control valve, thereby releasing hydraulic oil from the head end of the first boom cylinder to improve an initial motion speed.

Abstract: The amount of work of a work machine (11) is estimated using fuzzy logic based on the amount of operation of control units (L1) to (L4) which operate a hydraulic swing motor (16m) and cylinders (21c) to (23c). A setting signal, which sets the rotational speed of an engine (19) based on the estimated amount of work, is set using the fuzzy logic. The rotational speed of the engine (19) can be optimized according to the operator's operation intention with the control units (L1) to (L4), and energy loss of a hydraulic system can be suppressed.

Abstract: Provided is an automobile interior material capable of adequately maintaining a molded shape even when remolded (demolded) at a high temperature in thermoforming, and therefore capable of significantly shortening a molding time due to the capability of high temperature demolding. An automobile interior material 1 is provided with a fiber layer 2, and a resin layer 3 laminated on one surface of the fiber layer 2. The resin layer 3 is configured to contain a thermoplastic resin having a solidifying point of 82° C. to 190° C. measured by differential scanning calorimetry.

Abstract: Provided is an interior material for motor vehicles in which curling of the interior material can be reduced even when no thermoforming has been performed, curling of the interior material can be reduced even if thermoforming is performed, the ease of fitting the material on an inner wall surface of the like such as the motor vehicle floor surface can be improved, and a film of the resin layer is very easily formed. An interior material 1 for motor vehicles equipped with a fibrous layer 2 and a resin layer 3 laminated on one of surfaces of the fibrous layer 2 is configured such that the resin layer 3 contains a polyolefin based resin having a density of 0.80 g/cm3 to 1.00 g/cm3, and an inorganic filler and that a content rate of the inorganic filler in the resin layer is 8 mass % to 80 mass %.

Abstract: A control device for suppressing engine load fluctuation according to main pump circuit conditions, wherein an assist torque calculation task includes a target engine torque calculation task separating smooth torque components from main pump load torque and setting a minimum value of either smooth torque component or engine setting torque as target engine torque, and a subtractor calculating target assist torque based on a difference between the main pump load torque and the target engine torque, the assist torque calculation task controlling a capacity of an assist pump based on the target assist torque and controlling switching between an assist mode and a charge mode.

Abstract: Engine and pump control device including controller functioning to, when pump discharge pressure changes from flow rate control area in which pump discharge flow rate is controlled at a low load to output control area in which engine output is controlled at a middle or high load, calculate each value of reduced engine rotating speed and increased engine torque on condition that the product of the engine rotating speed by the engine torque is maintained within a predetermined output level and control engine rotating speed based on these values and control the swash plate angle of the variable displacement pump.

Abstract: Provided is a hydraulic circuit capable of saving a pump flow rate while hydraulic fluid is being accumulated in an accumulator. The hydraulic circuit has: a couple of boom cylinders that simultaneously operate the same operation by the hydraulic oil supplied under pressure from main pumps; an accumulator in which pressure of the hydraulic oil is accumulated; a pressure accumulating circuit that accumulates the pressure of the hydraulic oil extruded from one boom cylinder in the accumulator; and a regenerating circuit that regenerates the hydraulic oil extruded from the other boom cylinder to the boom cylinders.

Abstract: The invention addresses the problem of avoiding insufficient flow being supplied to the hydraulic actuator and speed becoming insufficient during light loads in hydraulic machinery such as hydraulic shovels when the engine rotation speed is set low during normal work. The solution is to increase the discharge flow of the hydraulic pump (2) by increasing the rotation speed of the engine (1) above the target rotation speed set by the engine rotation speed-setting means (14) when the hydraulic pump (2) discharge pressure is at the light load pump discharge pressure, the hydraulic pump (2) inclination angle is at the maximum inclination angle, and the negative control signal pressure is at the signal pressure when the hydraulic actuator-operating means (7) is at full operation.

Abstract: The present invention provides a moisture-permeable waterproof sheet for building materials capable of maintaining an excellent nail hole sealing performance to keep waterproof thereof even after being exposed to severe environmental conditions. The moisture-permeable waterproof sheet 1 for building materials of this invention includes a non-woven fabric layer 2 having a bulk density of 0.01 g/cm3 or more, a porous polyolefin film layer 3 arranged on an upper side of the non-woven fabric layer 2 and having waterproof properties and moisture-permeability, and an air-permeable adhesive resin layer 4 made of a plurality of linearly-formed resins 11 arranged approximately in parallel with each other in a plan view and joining the non-woven fabric layer 2 and the porous polyolefin film layer 3. A width of the linearly-formed resin of the air-permeable adhesive resin layer 4 is 0.5 to 3 mm, and a width of a gap between adjacent linearly-formed resins is 0.1 to 1 mm.

Abstract: A carpet for use in vehicles includes an upper surface layer 2, a nonwoven fabric sound absorption layer 3 and an adhesive resin layer 4 integrally securing the upper surface layer and the sound absorption layer. The adhesive resin layer is an air permeable resin layer formed by extruding melted thermoplastic into filament-like resin pieces by an extruder, and a thickness direction air permeability of the carpet falls within the range of 1 to 50 cm3/cm2·second. This carpet can secure excellent silence.