36results about How to "Suppress pressure pulsation" patented technology

The invention provides a two stage rotary compressor which can improve tracing ability of refrigerating fluid imported into an advanced compressing portion, restrain pressure fluctuation in intermediate flow paths, and prevent running efficiency from reducing in low load running. The two stage rotary compressor (100) of the internal high-pressure type includes a low stage cover (19) that covers a low stage outlet port (16) and forms a low stage discharge space (20) therein. Further, the two stage compressor (100) includes a compression mechanism (3) provided with an intermediate passage (51) that connects the low stage discharge space (20) and the high stage compression chamber (35) and a bypass mechanism (a bypass port (23), a bypass valve (24), and a bypass valve guard (25) in the low stage cover (19), in which the bypass mechanism opens when a load is smaller than a predetermined load and in which the bypass mechanism connects the low stage discharge space (20) and a discharge pressure space (53).

A fuel-evaporated gas processing system includes an input port taking in evaporated gas evaporated in a fuel tank; output ports supplying the evaporated gas taken in through the input port to an intake system of an engine; a chamber interposed between the input port and the output ports; an electromagnetic valve device including at least first and second electromagnetic valves disposed in the connection between the input port or the output ports and the chamber, either of the input port or the output ports being branched off into a plurality of sections, and perform opening and closing operations in response to a driving signal; and a valve control means driving the first and the second electromagnetic valves of the electromagnetic valve device.

The present invention provides a method for synergistically suppressing combustion pressure pulsation by using a high-frequency excitation discharge center plasma and a side plasma, and relates to a method for suppressing pressure pulsation in a thermoacoustic oscillation phenomenon. In the present invention, synergy of a center plasma and a side plasma is taken as a dynamic and active way to regulate the pressure pulsation state of the combustion chamber during combustion. The method provided by the present invention is characterized in that plasmas are generated at the root and side of the flame in the combustion chamber, and the root plasma dynamically affects the frequency and the phase law of the flame heat release, so that the response degree of the pulsating flame to the airflow disturbance changes; the plasma applied on the side of the flame is input to the main body for absorbing the flame through certain energy to change the distance between the main flame heat release zone and the outlet of the combustion chamber, that is, the length of the return path reflected by the pressure pulsation in the combustion chamber from the outlet of the combustion chamber is changed, andthe phase difference between the pressure pulsation and the flame heat release rate changes; and at the same time, the synergy and adjustment of the plasmas at the two positions can achieve the slowing or suppression of the combustion pressure pulsation.

In a hydraulic control device, when it is detected that a pressure of first oil (output pressure) detected by an output pressure sensor pulsates, a transmission control unit as a TCU stops driving of a second pump or decreases a rotation number of the second pump as a first operation. Alternatively, when it is detected that the output pressure pulsates, the TCU increases the rotation number of the second pump to a rotation number (for example, maximum rotation number) that is higher than a target rotation number as a second operation.

A fuel cell vehicle includes a fuel cell stack, a hydrogen gas supply pipe for supplying a hydrogen gas to the fuel cell stack, and injectors provided at positions along the hydrogen gas supply pipe, for injecting the hydrogen gas to the fuel cell stack. The hydrogen gas supply pipe includes a buffer, provided on the upstream side of the injectors, and the hydrogen gas can flow through the buffer. The buffer includes a branch pipe branched from the hydrogen gas supply pipe, and the buffer tank coupled to the branch pipe so as to allow the hydrogen gas to flow through the buffer tank.

This dampening device comprises a body defining a chamber and presenting at least one orifice intended for the inlet and the outlet of the fluid in the chamber. The dampening device further comprises i) a dampening member located in the chamber and comprising at least one foam with closed cells, and ii) a holding member configured to hold the dampening member in place. The dampening device being characterized in that at least one foam has a porosity comprised between 50% and 98%.

A fuel injection valve includes a needle for opening or closing an injection hole. The needle moves in response to a fuel pressure in a control chamber. The fuel injection valve includes an electromagnetic valve which opens or closes a discharge passage for changing pressure in the control chamber to actuate the needle. A narrow part is provided in the discharge passage. The narrow part is formed to shorten a length along a flow direction. The shortened narrow part can suppress pulsations. Therefore, it is possible to accurately control injection quantity, since a variation of closing speed of the armature caused by the pulsations can be suppressed.

The invention provides a fuel supply device for inhibiting combustion instability, combustion equipment and a control method, The fuel supply device for inhibiting the combustion instability comprisesan oil tank, a booster pump and a phase frequency adjusting device, wherein the oil tank is used for storing fuel oil, and is used for increasing the pressure of the fuel oil in a pipeline; the phasefrequency adjusting device is used for adjusting the frequency of the fuel oil sprayed in a combustion chamber and a phase in real time according to the difference value of the fuel oil phase in thepipeline and the combustion chamber, so that pressure pulsation in the combustion chamber is inhibited. The fuel supply device for inhibiting the combustion instability is used for measuring the phaseof the fuel oil in the pipeline and the phase of the combustion chamber in real time by arranging a first dynamic pressure sensor and a high-frequency dynamic pressure sensor; and the frequency and the phase of the oil supply are adjusted in real time by arranging a high-frequency electromagnetic valve and a phase shifter, so that when the phase difference value of the fuel oil in the pipeline and the phase difference value of the fuel oil in the combustion chamber are smaller than 90 degrees, the frequency and the phase of the oil supply can be timely adjusted, and the pressure pulsation generated by combustion in the combustion chamber can be effectively inhibited.

A reciprocating engine (1) comprising an engine block (2) with cylinders (3) and inlet passages (5) for guiding intake air into the cylinders (3). The inlet passage (5) is provided with a main intake receiver (6) and at least one auxiliary intake receiver (7), and the auxiliary intake receiver (7) is arranged on the main intake receiver (6) ) and upstream of the cylinder (3).

A holding device is used for fastening a fuel distributor to an internal combustion engine. A plurality of holding elements is provided, which are able to be fixed in place on the internal combustion engine via a fastener. A cable guide is provided in addition. The holding elements are connected to the cable guide. In addition, a system having such a holding device and a fuel distributor for conveying fuel are provided.