361results about How to "Improve quietness" patented technology

A high-pressure pump is formed with a secondary suction passage, which branches from a fuel suction passage and communicates with a pump chamber. Check valves for preventing a backflow of fuel are disposed respectively in the secondary suction passage and a discharge passage. An electromagnetic valve for regulating a fuel discharge quantity is disposed in the fuel suction passage. Normal control for controlling the fuel discharge quantity by controlling opening timing and closing timing of the electromagnetic valve with respect to reciprocating movement of a plunger is performed when an engine rotation speed is higher than a predetermined value during operation of an engine. Valve closing control for holding the electromagnetic valve at a closed state is performed when the engine rotation speed is equal to or lower than the predetermined value.

An outboard motor is equipped with a centrifugal clutch located between the crankshaft of an engine and a rotor of an electric motor for, when the engine operates, transmitting its output to through the rotor to a propeller, and with a motor output transmission mechanism for, when the engine does not operate, transmitting the output of the motor to the crankshaft. The engine can therefore be started by the motor used to drive the propeller. As a result, there is no need to install a separate electric motor for engine starting, so that starting of the engine by electric power can be made possible with minimum increase in the size and cost of the outboard motor.

The present invention provides a rotation detecting device having a small size, low manufacturing costs, and excellent quietness, and an automobile equipped with the rotation detecting device. The rotation detecting device comprises a non-rotating internal gear 2b concentrically arranged with the rotation center of a rotary body (a steering shaft), a planetary gear 4 that meshes with the internal gear 2b and that rotates and revolves on the inner circumference of the internal gear 2b with the rotation of the rotary body, a rotation transmitting member 6 that is concentrically arranged with the rotation center of the rotary body and that rotates on its own axis by the rotation of the planetary gear 4, a scale plate 7 provided in the rotation transmitting member 6, and a rotation angle detecting unit 11 arranged to face the scale plate 7 for detecting the rotation angle of one or more full rotations of the rotary body.

An apparatus for determining position of a free piston used in such as hydraulic compressor, which has no mechanical connection with crank shaft, and an apparatus for controlling reciprocating motion of the free piston are disclosed. A free piston position determining apparatus comprises a magnetic sensor disposed in a case containing a free piston, and a magnet disposed on the free piston. The magnet sensor generates pulse train when the magnet is positioned within a pre-determined distance form the magnet sensor. Stroke of the free piston is computed based on duration of the pulse, and offset of the average piston position from designed average position is computed based on interval of the pulse.

An arrangement of a cooling apparatus installed in a vehicle for cooling with an air refrigerant an electricity storing apparatus for storing electricity generated in the vehicle, comprises an inlet port, a discharge duct and a fan. The inlet port let in therefrom the air refrigerant to the electricity storing apparatus. The discharge duct is disposed below a floor surface of a trunk of the vehicle for causing the air refrigerant discharged from the electricity storing apparatus to flow therethrough. The fan is situated in the discharge duct for discharging the air refrigerant. The fan is disposed outwardly of an interior material provided on a side of the trunk of the vehicle. The arrangement of a cooling apparatus can prevent the operating noise of a fan from entering a passenger compartment and which can facilitate the installation of luggage in a trunk.

The invention discloses a mute water discharging pipe, belonging to the field of pipe materials. The mute water discharging pipe not only has a good noise reducing effect, but also has good mechanical performance, and has a three-layer structure, wherein the inner layer and the outer layer are polypropylene felts, and the middle layer is a sound-absorbing core layer; and the sound-absorbing core layer comprises the raw materials in parts by weight: 100-200 parts of polypropylene resin and 20-100 parts of noise-absorbing material, wherein the polypropylene resin is made of block copolymerized polypropylene, homopolymerized polypropylene or random copolymerized polypropylene; and the noise-absorbing material is selected from at least one of wollastonite, calcium carbonate, talcum powder, barium sulfate and silicon dioxide. The mute water discharging pipe disclosed by the invention has the advantages of excellent muting effect, superstrong chemical corrosion resistance, excellent high temperature resistance, good impact resistance, long service life and the like.

The invention relates to the technical field of air conditioners and discloses an air conditioner control method and device, an air conditioner and a computer readable storage medium. The air conditioner control method comprises the steps of controlling the air conditioner to get into a silent mode when the difference value of the current indoor temperature and the current set temperature is lessthan or equal to a preset temperature difference threshold value; controlling an indoor draught fan to be lowered to the preset low rotating speed to operate and monitoring the current system pressure; and gradually reducing the operating frequency of a compressor according to pressure changes of the current system pressure. In the whole control process, the indoor draught fan and the compressor are not shut down, and the rotating speed of the indoor draught fan and the operating frequency of the compressor are gradually reduced. The problem that an existing air conditioner has loud noise during second startup in a shutdown first and startup second mode when the air conditioner reaches up to the set temperature is avoided. Accordingly, the air conditioner has the good silent effect and improves user experience.

In a vehicle control apparatus, a hybrid ECU automatically stops and starts an engine if a predetermined condition is met while the vehicle is stopped. A brake ECU controls the braking force applied to wheels. A hybrid ECU controls the brake ECU so that braking force is applied to the wheels at the time of startup of the engine if while the vehicle is stopped, the vehicle run position is not selected as a shift position of the transmission. This restrains vibration of the vehicle at the time of startup of the engine.

An automotive alternator is disclosed which includes an annular core disposed to surround the radially outer peripheries of all magnetic pole claws of magnetic pole cores. The annular core has, on an outer surface thereof, a plurality of protrusions, a plurality of recesses, and a plurality of slopes. Each of the protrusions is so provided as to be coincident with a corresponding one of the magnetic pole claws of the magnetic pole cores in the circumferential direction of a rotary shaft. Each of the recesses is alternately formed with the protrusions so as to be coincident with a corresponding one of air gaps formed between the magnetic pole claws of the magnetic pole cores in the circumferential direction. Each of the slopes is inclined to the radial direction of the rotary shaft and connects a circumferentially adjacent pair of one of the protrusions and one of the recesses.

The invention relates to an air conditioner control system. A radiant panel is arranged on an indoor unit. The indoor temperature can rapidly reach a set temperature point through the forced convection heat exchange of an indoor unit heat exchanger and air. When the indoor temperature reaches the set temperature, the indoor comfort degree is kept mainly through thermal radiation of a radiation device, an inner draught fan can be controlled to run in an ultra-silence manner or run at a low-wind gear or run in an intermittent manner or to completely stop running, and therefore the problem that the strong air blowing feeling exists during refrigerating running or heating running is solved, and meanwhile the running noise of the draught fan is reduced. The indoor unit discharges air upwards in the refrigerating process, and discharges air downwards in the heating process. Meanwhile, due to the fact that thermal radiation does not need to be spread through media and indoor air doest not have an isolation effect on thermal radiation, thermal radiation directly acts on human bodies and indoor facilities, and uniform indoor temperature gradient and comfort are ensured. Due to the fact that the radiation device bears parts of indoor loads, a radiation heat exchange panel can be produced in a modularized manner, and modularized selection installation of air conditioners is achieved according to sizes of rooms or magnitudes of loads.

A purpose of the present invention is to provide a rim wheel and a tire rim assembly which are capable of effectively reducing cavity resonance of a tire, and accordingly, enhancing quietness and riding comfort. A plurality of cap members 20 is arranged on an outer circumferential surface of a rim 16 in a circumferential direction thereof, diaphragms are disposed inwardly of each cap member 20, and a plurality of sub-air chambers 32 is formed between the rim 16 and the cap members 20 in a rim circumferential direction. The tire main air chamber 18 is connected to the sub-air chambers 32 through communicating holes 24 formed on the cap members 20. The sub-air chambers 32 and the communicating holes 24 constitute a Helmholtz resonance noise absorber that can absorb vibration with specified frequencies. Further, since the sub-air chamber 32 is not formed in a continuous annular shape in a tire circumferential direction, occurrence of cavity resonance can be suppressed and a substantial reduction in noise can be secured.

The present invention relates to a frictional power transmission belt having a frictional power transmission surface covered with a warp knitted fabric, in which the warp knitted fabric contains a water absorptive thread in a proportion of 30% by mass or more based on the total amount of threads constituting the warp knitted fabric and a wale direction of the warp knitted fabric is substantially parallel to a belt longitudinal direction.

A brake control device includes a front-wheel left-right communication passage that allows communication between wheel cylinders for a front-left wheel and a front-right wheel via a front-wheel communication on-off valve; a rear-wheel left-right communication passage that allows communication between wheel cylinders for a rear-left wheel and a rear-right wheel via a rear-wheel communication on-off valve; and a front-rear communication passage that allows communication between a wheel cylinder of either one of the front-left and front-right wheels and a wheel cylinder of either one of the rear-left and rear-right wheels via a front-rear communication on-off valve, wherein the brake control device keeps the front-wheel communication on-off valve, the rear-wheel communication on-off valve, and the front-rear communication on-off valve opened to set a mode to a four-wheel communication mode during a normal brake control. With this, some of linear control valves are deactivated, whereby an operating noise can be reduced.

A door mirror which includes a camera for checking the side of a vehicle which is in a blind spot of a driver, has a door mirror body having a through hole formed for lens side part of the camera to be inserted therein, and a camera cover having an opening part for exposing the lens part formed, and the camera cover has the first abutting surface which abuts on the outer surface of the door mirror body with elasticity.