Control circuit for an active rotational speed sensor

A control circuit for an active rotational speed sensor of a vehicle, the active rotational speed sensor being configured to detect a rotational speed of a wheel and to output a sensor signal based thereon, comprising:

• a monitoring circuit, including:
• a first terminal and a second terminal for an electrical connection of the rotational speed sensor and for receiving the sensor signal;
• a supply terminal for connection to a supply voltage of the vehicle and a ground terminal for connection to a ground;
• a sensor signal output for providing the sensor signal from the active rotational speed sensor;
• a first switch configured to switch the first terminal with the supply terminal;
• a second switch configured to switch the second terminal with the ground terminal;
• an overcurrent detector configured to detect an overcurrent through the supply terminal or through the ground terminal and, upon detection, to open the first switch or the second switch;
• and
• a voltage controller configured to effect adjustment of an electrical voltage between the first terminal and the ground terminal to a target value.

An anti-lock braking system for a commercial vehicle with at least one active rotational speed sensor, comprising:

• a control device having at least one control circuit, wherein each control circuit is for an active rotational speed sensor of a vehicle, the active rotational speed sensor being configured to detect a rotational speed of a wheel and to output a sensor signal based thereon, including:
• a monitoring circuit, including:
• a first terminal and a second terminal for an electrical connection of the rotational speed sensor and for receiving the sensor signal;
• a supply terminal for connection to a supply voltage of the vehicle and a ground terminal for connection to a ground;
• a sensor signal output for providing the sensor signal from the active rotational speed sensor;
• a first switch configured to switch the first terminal with the supply terminal;
• a second switch configured to switch the second terminal with the ground terminal;
• an overcurrent detector configured to detect an overcurrent through the supply terminal or through the ground terminal and, upon detection, to open the first switch or the second switch;
• and
• a voltage controller configured to effect adjustment of an electrical voltage between the first terminal and the ground terminal to a target value.

A method, the method comprising:

• controlling and monitoring an active rotational speed sensor of a vehicle using a control circuit;
• wherein the control circuit is for an active rotational speed sensor of a vehicle, the active rotational speed sensor being configured to detect a rotational speed of a wheel and to output a sensor signal based thereon, including:
• a monitoring circuit, including:
• a first terminal and a second terminal for an electrical connection of the rotational speed sensor and for receiving the sensor signal;
• a supply terminal for connection to a supply voltage of the vehicle and a ground terminal for connection to a ground;
• a sensor signal output for providing the sensor signal from the active rotational speed sensor;
• a first switch configured to switch the first terminal with the supply terminal;
• a second switch configured to switch the second terminal with the ground terminal;
• an overcurrent detector configured to detect an overcurrent through the supply terminal or through the ground terminal and, upon detection, to open the first switch or the second switch;
• and
• a voltage controller configured to effect adjustment of an electrical voltage between the first terminal and the ground terminal to a target value.