Actuating device, in particular for a vehicle braking system

An actuating device for a vehicle braking system, comprising:

• an actuating mechanism,
• a power-operated actuator,
• a travel simulator,
• a main cylinder,
• a first travel sensor for sensing the travel of a first element of the actuating mechanism,
• a second travel sensor for sensing, separately from the first travel sensor, travel of a second element of the actuating mechanism,
• an elastic or resilient mechanism disposed between two elements configured to be moved relative to each other, and
• an actuating element configured to be moved with one of the elements configured to be moved relative to each other, wherein the actuating element is arranged so as to be movable with respect to the other movable element, and
• an evaluation unit configured to evaluate differential travels of the travel sensors and to determine discrepancies from force-travel characteristics of the elastic or resilient mechanism to detect malfunctions of the actuating device.

An actuating device for a vehicle braking system, comprising:

• an actuating mechanism,
• a power-operated actuator,
• a first travel sensor for sensing the travel of a first element of the actuating mechanism,
• a main cylinder,
• a second travel sensor for sensing, separately from the first travel sensor, the travel of a second element of the actuating mechanism,
• an actuating element configured to be moved with one of the elements configured to be moved relative to each other, wherein the actuating element is arranged so as to be movable with respect to the other movable element,
• a piston-cylinder unit in addition to the main cylinder, and
• a transmission element coupled to an element that is configured to be moved relative to a piston of the piston-cylinder unit and is arranged between the piston of the piston-cylinder unit and the transmission element, and
• an evaluation unit configured to evaluate the differential travels of the first and second travel sensors and to determine discrepancies from force-travel characteristics of an elastic or spring mechanism arranged between the elements configured to be movable with respect to each other to detect malfunctions of the actuating device.