... variables 1. 9 Main areas of control engineering Today, control engineering has applications in almost every area of technology In Chapter 1. 1 we have already seen that these different applications ... already discussed in Chapter 1. 3, “Operation and control , a parameter can be kept constant by suitable operation An example could be to maintain a constant furnace temperature Assuming a constant ... numerical values, and uses them to calculate the manipulating variable This has certain advantages compared with analog processing: - increased accuracy of control, depending on the measurement...