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The Maxwell electromagnetic field equations, discovered by J.C. Maxwell wrote a paper in the year 1868 "On Governors," which was able to describing the exhibited by the fly ball governor. To describe the control system, he utilized differential equations. This paper exhibited the importance and helpfulness of mathematical models and methods in relation to understanding complicated phenomena. It also signaled the beginning of mathematical control and systems theory. Previous elements of control theory had appeared before by not as convincingly and as dramatically as in Maxwell's study.
In the following 100 years control theory made huge strides. New developments in mathematical techniques made it feasible to more accurately control significantly more dynamic systems compared to the original fly ball governor. These updated methods include various developments in optimal control during the 1950s and 1960s, followed by progress in stochastic, robust, adaptive and optimal control methods in the 1970s and the 1980s.
New technology and applications of control methodology have helped produce cleaner auto engines, more efficient and cleaner chemical processes and have helped make space travel and communication satellites possible.
Initially, control engineering was practiced as a part of mechanical engineering. In addition, control theory was initially studied as part of electrical engineering for the reason that electrical circuits can often be simply explained with control theory methods. Nowadays, control engineering has emerged as a unique practice.
The first control relationships had a current output that was represented with a voltage control input. Because the correct technology in order to implement electrical control systems was unavailable at that moment, designers left with the choice of slow responding mechanical systems and less efficient systems. The governor is a very effective mechanical controller which is still often used by some hydro factories. Eventually, process control systems became available before modern power electronics. These process controls systems were often used in industrial applications and were devised by mechanical engineers using hydraulic and pneumatic control devices, many of which are still being utilized these days.
Hydraulics
The hydraulics are the forklift's "muscles". They give the necessary force needed to raise heavy loads during the entirety of a long shift. All Yale trucks feature industrial grade hydraulic components. Several of these components consist of: heavy-duty hydraulic valves, leak resistant O-ring face seal fittings, fine micron filters and long lasting tilt and hoist cylinders. The control valve has been strategically placed in order to prolong component life by reducing exposure to heat sources.
The Yale forklift can withstand the most extreme working situations coming out on top with their great reliability. These machines have been built in such a precise way that attention to detail has been taken into consideration to be able to keep the operator as comfortable as possible.
