A hinge (1, 100) for the articulated attachment of a hood to the chassis of a vehicle, comprising - a structure articulated in a plane of movement incorporating a support body, intended for being securely held on the chassis of the vehicle; an upper bar, linked through at least one articulation to the mentioned support body directly or via a lever; a hood support bar; and retention means for securely anchoring the hood support bar to the upper bar under normal conditions of use of the hinge by means of a latch assembled on the support bar; the hinge further comprising - an electromechanical transducer converting an electrical signal into a mechanical drive, with a first end and a second end (12a, 12b) susceptible of moving away from one another in the plane of movement of the structure when the transducer is activated and changes from adopting a retracted position to adopting an extended position, the hinge is characterized in that it comprises - an upper articulated attachment, connecting the first end of the transducer and the latch, which is axially aligned with the articulation linking the upper bar and the support body when the transducer adopts its retracted position and the support bar is anchored to the upper bar, and - a lower articulated attachment, connecting the second end of the transducer to a point, arranged on one of the support body or the lever, that keeps its distance with respect to the articulation during the hood closing and opening operations under normal conditions of use of the hinge, i.e., while the support bar is anchored to the upper bar, whereas it acts as a support point when the transducer is extended, causing the upper articulated attachment to move sufficiently to operate the latch, the anchoring of the support bar to the upper bar being disabled, and to lift it, dragging the support bar along in its movement, to a position of impact. - a structure articulated in a plane of movement incorporating a support body, intended for being securely held on the chassis of the vehicle; an upper bar, linked through at least one articulation to the mentioned support body directly or via a lever; a hood support bar; and retention means for securely anchoring the hood support bar to the upper bar under normal conditions of use of the hinge by means of a latch assembled on the support bar; the hinge further comprising - an electromechanical transducer converting an electrical signal into a mechanical drive, with a first end and a second end (12a, 12b) susceptible of moving away from one another in the plane of movement of the structure when the transducer is activated and changes from adopting a retracted position to adopting an extended position, the hinge is characterized in that it comprises - an upper articulated attachment, connecting the first end of the transducer and the latch, which is axially aligned with the articulation linking the upper bar and the support body when the transducer adopts its retracted position and the support bar is anchored to the upper bar, and - a lower articulated attachment, connecting the second end of the transducer to a point, arranged on one of the support body or the lever, that keeps its distance with respect to the articulation during the hood closing and opening operations under normal conditions of use of the hinge, i.e., while the support bar is anchored to the upper bar, whereas it acts as a support point when the transducer is extended, causing the upper articulated attachment to move sufficiently to operate the latch, the anchoring of the support bar to the upper bar being disabled, and to lift it, dragging the support bar along in its movement, to a position of impact.