Woodward UG-25 UG series mechanical hydraulic governors controlling diesel

Woodward UG-25 is a microprocessor-controlled mechanical-hydraulic governor in the UG series, mainly used to control diesel, gasoline, dual - fuel engines or steam turbines. Here is a detailed introduction:

Features and Advantages

Strong control ability: It has functions such as starting, fuel limiting and boosting schemes. The additional transient fuel limiting (step rate) can improve the engine's sudden load - increasing ability and significantly reduce transient emissions.

High - performance operation: It is a fast - acting and high - work - capacity governor that does not require additional equipment such as starting servos.

Software - based speed control: It provides speed control through software, including optional speed control points, dynamics, fuel limiting, and start - up/shutdown status.

Rich control characteristics: It integrates advanced speed detection and control algorithms, and has an embedded user interface that provides speed - up/speed - down and emergency stop functions. It also supports speed control with droop and dynamic characteristics, and the speed setting and regulation rate are configurable. In addition, it has a variety of fuel - limiting algorithms, such as step rate, boost pressure, and starting fuel limiting.

Working Principle

The UG-25 + governor generates an operating oil pressure of 1034 KPa (150 psi) through an internal gear pump driven by the drive shaft. The oil pump sucks oil from the internal oil chamber and maintains the oil pressure through a relief valve system. The governor comprehensively utilizes the advantages of traditional mechanical governors and advanced engine control algorithms to optimize engine operation. It adjusts the engine speed by precisely controlling the fuel flow according to the speed setting or user input, so as to achieve stable operation of the engine under different working conditions.

Structure and Components

L-series controller: Controls the engine speed/load according to the speed setting or user input through knob - type output.

Hydraulic amplification part: Amplifies the output of the L - series controller to drive the relevant components of the engine and realize the adjustment of the fuel supply.

User interface: Provides local droop control, load/fuel limiting, stability adjustment and shutdown functions. It also has indicator lights to display the working status of the system, such as whether the input voltage is normal, and whether the analog speed setting is activated. In addition, the user interface is also equipped with relevant adjustment knobs, such as the load - limiting/fuel - limiting knob and the stability knob, to meet the operation and adjustment needs in different working conditions.

Electrical Characteristics

The working voltage range of the UG-25 + governor is 18 - 32 Vdc, with positive and negative protection. At the nominal voltage of 24 V, the nominal current is not more than 500 ma. A 6 A current fuse should be installed on the positive line (J1 - 30 - F3) of the control system power supply, and a 500 ma current fuse should be installed on the internal power supply output positive (J1 - 30 - E3).