System for controlling operation of first and second electric fans

A system for controlling operation of first and second electric fans, comprising:

• a microcontroller having first and second analog-to-digital converters and first and second output ports;
• a first fan driver circuit being electrically coupled to the first output port of the microcontroller via a first electrical line, the first fan driver circuit being further electrically coupled to the first electric fan;
• a first speed sensor generating a first speed signal indicating a rotational speed of the first electric fan;
• a first analog multiplexer having first and second input ports and an output port, the first input port of the first analog multiplexer being electrically coupled to the first electrical line, the second input port of the first analog multiplexer being electrically coupled to the first speed sensor;
• a first channel of the first analog-to-digital converter being electrically coupled to the output port of the first analog multiplexer;
• a second fan driver circuit being electrically coupled to the second output port of the microcontroller via a second electrical line, the second fan driver circuit being further electrically coupled to the second electric fan;
• a second speed sensor generating a second speed signal indicating a rotational speed of the second electric fan;
• a second analog multiplexer having first and second input ports and an output port, the first input port of the second analog multiplexer being electrically coupled to the second electrical line, the second input port of the second analog multiplexer being electrically coupled to the second speed sensor;
• a first channel of the second analog-to-digital converter being electrically coupled to the output port of the second analog multiplexer;
• the microcontroller being programmed to generate first and second control signals to induce the first and second fan driver circuits, respectively, to generate first and second driving voltages, respectively, to induce the first and second electric fans, respectively, to operate at first and second rotational speeds, respectively;
• and
• the microcontroller being programmed to determine when the second analog multiplexer is malfunctioning or the first channel of the second analog-to-digital converter is malfunctioning based on first values obtained from the second analog-to-digital converter, the first values being associated with at least one of the second speed signal and the second driving voltage that are received by the second analog multiplexer.