32results about How to "Solve the surge" patented technology

A method of operating an engine having a turbocharger and a high pressure EGR system is provided. In one example, a compressor of the turbocharger may have a recirculation passage with a recirculation valve coupled therein. The method may include during a first engine airflow condition: delivering at least some high pressure un-cooled EGR to the intake, downstream of the compressor, operating the throttle at a first throttle amount, and operating the compressor bypass valve at a first bypass amount to increase exhaust gas temperature; and during a second engine airflow condition higher than the first engine airflow: delivering at least some high pressure cooled EGR to the intake, downstream of the compressor, operating the throttle at a second throttle amount more open than the first amount, and operating the compressor bypass valve at a second bypass amount more closed than the first amount.

The invention provides a static equilibrium valve and belongs to the technical field of valves. The static equilibrium valve solves the problems, for example, an existing static equilibrium valve is strenuous in hand wheel rotating, and a valve core structure is complex. The static equilibrium valve comprises a valve body, wherein the interior of the valve body is a cavity. A water inlet and a water outlet are respectively arranged on the left side and the right side of the valve body, a valve core is arranged in the valve body, the inner end of a valve rod is connected with the valve core, and the outer end of the valve rod stretches out of the valve body and is connected with a hand wheel. The valve rod is provided with a platen, the valve core comprises a big valve core and a small valve core, the small valve core is fixedly connected with the inner end of the valve rod and arranged in the big valve core, and the outer side face of the small valve core is tightly attached to the inner side face of the big valve core. A reset spring is arranged in the valve body, one end of the reset spring abuts against the bottom portion of the valve body, and the other end of the reset spring abuts against the big valve core. The static equilibrium valve has the advantages of being labor-saving in operation, solving the problem of surging when the valve has a heavy caliber and a small opening, and the like.

The invention relates to a design method of a turntable vane in an axial flow compressor, and the invention relates to a design method of a turntable vane. The invention aims to solve the problems of complex design and manufacture and complex adjustment and control of an axial flow compressor unit with all rotatable guide vanes. In the present invention, the number of rows of transducible vanes is firstly designed according to the overall pressure ratio of the axial flow compressor, the relative rotational speed of the axial flow compressor, or the rate of change in flow regulation required by the design of the axial flow compressor; Specific transducible vanes; then design the rotation angle law of specific transducible vanes according to the designed row number of transducible vanes and specific transducible vanes; finally design the rotational angle ratio. The invention is applicable to the design and manufacture of axial flow compressors.

The invention discloses a passive anti-surge device for a volute of a centrifugal compressor, which comprises a volute and a piston assembly; the volute is provided with an annular chamber passage hole, a gas collection annular chamber and a pre-rotation hole in sequence, and the pre-rotation hole is connected with the impeller. The inlet is connected; the piston assembly includes a casing and a piston connected to the casing through an elastic member; the casing is installed on the volute and has an internal channel; the piston is arranged in the internal channel, and the internal channels on both sides of the piston are respectively supplied with the outlet of the compressor The bypass pipeline communicates with the flow hole of the annular chamber; the piston can close and conduct the internal passage during the process of moving in the internal passage; wherein, the piston is subjected to the force formed by the pressure difference on both sides of the piston or the force exerted by the elastic member Driven by force to move automatically in the internal channel. The device uses the pressure difference on both sides of the piston and the elastic force of the elastic member to act simultaneously to automatically control the connection between the air supply bypass pipeline at the outlet of the compressor and the inlet of the impeller, eliminating the need for an active control feedback system. The invention discloses a centrifugal compressor machine.

The invention relates to the technical field of fuel cell air compressor control, in particular to a fuel cell system and a control method thereof. The system includes a fuel cell stack, an air compressor and a controller. The air compressor supplies air to the fuel cell stack through the air supply pipeline; the output end of the controller is connected to the air compressor, and the input end of the controller collects corresponding signals. During the operation of the fuel cell, when it is judged that it is necessary to purge according to the amount of liquid water in the cathode channel, the controller controls the air compressor to make the target pressure less than the target pressure limit value. The target pressure limit value is based on the current target speed and the air compressor. The surge curve is obtained to prevent the surge of the air compressor caused by abnormal disturbances, ensure the service life of the air compressor, and solve the problem of improper handling of the target pressure and target speed changes of the fuel cell air compressor when the fuel cell single chip voltage is abnormal. Air compressor surge problem.

The invention discloses a self-adaptive multi-section voltage-boosting Boost chip with an automatic current-limiting protection function, and relates to the field of analog integrated circuits. The chip comprises a signal input detection circuit, a signal amplitude comparison circuit a voltage-boosting judgment time sequence control circuit, a current limiting time sequence control circuit, a voltage-boosting gear selection circuit and a voltage-boosting main body circuit. By detecting the amplitude of the envelope of the input signal, the voltage-boosting value is dynamically adjusted in realtime, and the most suitable voltage output in the internally set multi-section voltage value is selected, so that the working efficiency of the system is improved; in addition, during the dynamic switching process of the output voltage value of the DCDC boosted chip, the built-in automatic current-limiting protection function is added, and when it is detected that the system needs to output a voltage value which is higher than the current value, automatic current limiting process intervention is achieved, so that the risk of generating a large surge current when the output voltage is switchedis overcome.

The invention discloses an anti-surge control method of a high-pressure waste gas recycling supercharger of a diesel engine. The method includes the steps that 1, an ECU reads air inlet pressure, airinlet temperature and air flow signals of the engine, and the actual pressure ratio and air flow mass flow of the supercharger (1) are calculated; 2, whether the actual pressure ratio exceeds a critical pressure ratio of surge corresponding to the air inlet amount or not is judged, if yes, step 3 is executed, and if not, a waste gas recycling valve (4), a throttle valve (3) and the supercharger donot act; 3, the ECU reads the rotating speed and torque of the engine, and the speed change rate and torque change rate of the engine are calculated; 4, whether the speed change rate and the torque change rate of the engine exceed limit values or not is judged, if yes, step 5 is executed, and if not, the waste gas recycling valve, the throttle valve and the supercharger do not act; 6, the anti-surge state quits. According to the method, the problem of surge of the supercharger during normal running of a diesel vehicle is solved on the premise that emission and performance indexes of the engine are not reduced, and noise and moving caused by surge can be avoided.

A stall-eliminating blower for blowing or exhausting is composed of casing, motor, vane wheel and airflow collector, and is characterized by its additional reverse-flow unit, which can make the eddy flow caused by stall flow reversely back to main flow channel, so eliminating stall.