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J.C. Maxwell, who discovered the Maxwell electromagnetic field equations, wrote a paper in 1868 "On Governors," which was able to clarify the instabilities demonstrated by the fly ball governor. He used differential equations so as to explain the control system. This paper exhibited the usefulness and importance of mathematical methods and models in relation to understanding complicated phenomena. It even signaled the beginning of mathematical control and systems theory. Previous elements of control theory had appeared earlier by not as convincingly and as dramatically as in Maxwell's study.
Within the following one hundred years control theory made huge strides. New developments in mathematical methods made it possible to more accurately control considerably more dynamic systems compared to the first fly ball governor. These updated methods consist of different developments in optimal control during the 1950s and 1960s, followed by advancement in robust, stochastic, optimal and adaptive control methods in the 1970s and the 1980s.
New technology and applications of control methodology have helped produce cleaner auto engines, cleaner and more efficient chemical methods and have helped make space travel and communication satellites possible.
At first, control engineering was practiced as just a part of mechanical engineering. Control theories were initially studied with electrical engineering since electrical circuits can simply be described with control theory methods. At present, control engineering has emerged as a unique practice.
The very first controls had current outputs represented with a voltage control input. In order to implement electrical control systems, the proper technology was unavailable at that time, the designers were left with less efficient systems and the choice of slow responding mechanical systems. The governor is a very efficient mechanical controller which is still normally used by some hydro plants. Eventually, process control systems became available before modern power electronics. These process controls systems were usually used in industrial applications and were devised by mechanical engineers using hydraulic and pneumatic control machines, lots of which are still being utilized nowadays.
Hydraulics
The hydraulics are the "muscles" of the forklift. They provide the necessary force needed to raise heavy loads during the entirety of a long shift. All Yale trucks feature industrial grade hydraulic parts. Some of these parts consist of: heavy-duty hydraulic valves, leak resistant O-ring face seal fittings, fine micron filters and long lasting hoist and tilt cylinders. The control valve has been strategically positioned in order to prolong component life by minimizing exposure to heat sources.
Yale's diesel forklifts provide extreme reliability and are known for withstanding harsh working conditions and coming out on top. These machines have been constructed in such a precise way that attention to detail has been taken into account to be able to keep the operator as comfortable as they could be.
