Importance

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Abstract

An electronic control apparatus (13) switches several electrical load resistances (16), in particular the solenoid valves of a power shift gear, depending on the position of various information switches (19). The electronic control apparatus (13) has a plurality of load lines (17) each leading to a load resistance (16), and a central unit (15) having a plurality of electronic switches (1). Each of the load lines (17) can be connected via an electronic switch (1) to a supply voltage (14). The electronic switches (1) can each be switched by a logical signal and each has an output (5) for a logical status signal. The logical status signal indicates an open load resistance when the switch is open and a short-circuited load resistance when the switch is closed with an open, short-circuited switch (1), the status signal suggests an open load resistance. The electronic control apparatus (13) monitors the position of the information switches (19). Each of the information switches (19) is coupled between an information line (18) and a respective load line (17). The information line (18) is connected to an output terminal (3) of one electronic switch (1). To ascertain the position of the information switches (19), the information line connected electronic switch (1) is closed and each of the electronic switches (1) connected to a load line is opened. A load line information switches (1) having an open information switch (19) coupled to its load line (17) will generate a logic high signal at its switch status output (5) while a load line information switch (1) having a closed information switch (19) coupled to its load line (17) will generate a logic low signal at its switch status output (5).

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