Method for checking the functionality of an electromechanical wheel brake device of a motor vehicle, wheel brake device, and brake system

A method for checking functionality of an electromechanical wheel brake device of a motor vehicle, wherein the wheel brake device includes at least one first electromechanical actuator for actuating the wheel brake device and a second electromechanical actuator for blocking the wheel brake device for a parking brake function, the method comprising the following steps:

• activating the second actuator to block the wheel brake device;
• activating the first actuator to actuate the wheel brake device;
• detecting a movement variable of the first actuator;
• and
• based on the movement variable falling below a specified threshold, detecting the second actuator as being functional, and otherwise detecting the second actuator as being faulty.

An electromechanical wheel brake device, comprising:

• at least one first electromechanical actuator configured to actuate the wheel brake device;
• a second electromechanical actuator configured to block the wheel brake device for a parking brake function;
• and
• a control device configured to check functionality of the wheel brake device, the control device configured to:
• activate the second actuator to block the wheel brake device;
• activate the first actuator to actuate the wheel brake device;
• detect a movement variable of the first actuator;
• and
• based on the movement variable falling below a specified threshold, detect the second actuator as being functional, and otherwise detect the second actuator as being faulty.

An electromechanical brake system of a motor vehicle, comprising:

• an electromechanical wheel brake device, including:
• at least one first electromechanical actuator configured to actuate the wheel brake device,
• a second electromechanical actuator configured to block the wheel brake device for a parking brake function, and
• a control device configured to check functionality of the wheel brake device, the control device configured to:
• activate the second actuator to block the wheel brake device,
• activate the first actuator to actuate the wheel brake device,
• detect a movement variable of the first actuator;
• and
• based on the movement variable falling below a specified threshold, detect the second actuator as being functional, and otherwise detect the second actuator as being faulty;
• wherein the wheel brake device is associated with another wheel of the motor vehicle.