-Cách sử dụng tuyến tính Van bướm bộ chế hòa khí hiện nay vô cùng đặc tính điều khiển phi tuyến tính. Tại các vị trí tối thiểu (tải ánh sáng), các van phải di chuyển rất ít để thay đổi số lượng lưu lượng nhiên liệu một số lượng lớn. | Manual 26260 Governing Fundamentals and Power Management Non-Linear Usage Butterfly carburetor valves present extremely non-linear control characteristics. At minimum positions light load the valve must move very little to change the amount of fuel flow a large amount. At higher loads the valve must move a large amount to have any effect on fuel flow. Since governor output travel is essentially linear special linkage is necessary to make the two conditions compatible. This is called non-linear linkage. Non-linear linkage is also required on some diesel injection systems although these conditions are not usually as severe as they are when controlling a butterfly carburetor valve. In all cases the linkage should be designed to provide increased engine output in direct proportion to movement of the governor output. GAS OR GASOLINE ENGINE WITH OARRURRTORS MINIMUM HULL 017-007 Figure 4-4. Nonlinear Carburetor Linkage CARBURETOR COMPENSATING LINKAGE When installing this linkage make sure the following conditions are obtained when the governor output is in the min fuel position The governor lever and connection link are in line with the governor output shaft and the point of attachment on the connecting link to the butterfly carburetor lever. The butterfly carburetor lever is 90 with the connecting link. Woodward 25 Governing Fundamentals and Power Management Manual 26260 Chapter 5. Magnetic Pickups Introduction CONNECTOR BRACKET OR MINIMUM OUTPUT PREQUENCY OP MAGNETIC PICKUP IN HERTZ NO. OF GEAR TEETH X GEAR RPM Hz --------------- 0------------------ EN 0122 97-04-23 Figure 5-1. Magnetic Pickup A magnetic pickup see Figure 5-1 is the device most often used to sense the speed of a prime mover. It is basically a single pole alternating current electric generator consisting of a single magnet with a multiple-layer coil of copper wire wrapped around one pole piece. The field or flux lines of the magnet exit the north pole piece of the magnet travel through the pole piece and
