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J.C. Maxwell, who discovered the Maxwell electromagnetic field equations, wrote a paper in the year 1868 "On Governors," which could describe the instabilities exhibited by the fly ball governor. He utilized differential equations so as to explain the control system. This paper demonstrated the importance and helpfulness of mathematical models and methods in relation to understanding complex phenomena. It also signaled the start of systems theory and mathematical control. Previous elements of control theory had appeared before by not as dramatically and as convincingly as in Maxwell's analysis.
New developments in mathematical techniques and new control theories made it possible to more precisely control more dynamic systems than the first model fly ball governor. These updated techniques comprise different developments in optimal control in the 1950s and 1960s, followed by advancement in robust, stochastic, adaptive and optimal control methods during the 1970s and the 1980s.
New technology and applications of control methodology have helped make cleaner auto engines, more efficient and cleaner chemical methods and have helped make communication and space travel satellites possible.
In the beginning, control engineering was performed as a part of mechanical engineering. Furthermore, control theory was first studied as part of electrical engineering as electrical circuits can often be simply explained with control theory methods. Now, control engineering has emerged as a unique practice.
The very first controls had current outputs represented with a voltage control input. 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 effective mechanical controller which is still often used by various hydro factories. In the long run, process control systems became available before modern power electronics. These process controls systems were normally used in industrial applications and were devised by mechanical engineers making use of pneumatic and hydraulic control machines, many of which are still being used at present.
Hydraulics
The forklifts hydraulics are the muscles of the vehicle, giving the necessary force to lift many heavy loads. All Yale trucks feature industrial grade hydraulic components. Several of these components consist of: leak resistant O-ring face seal fittings, heavy-duty hydraulic valves, long lasting hoist and tilt cylinders, and fine micron filters. The control valve has been strategically placed in order to prolong part 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 machinery have been constructed in such a precise way that attention to detail has been considered so as to keep the operator as comfortable as they can be.
