| 摘要 |
The invention relates to a system for raising and lowering a bonnet of a motor vehicle (1). The invention aims to provide a reversible system, i.e. one that can be returned to its original position, in case it has been triggered incorrectly. To this end, an electromotor, a pneumatic or hydraulic drive, a combination of these, or a combination of a spring and an electromotor is used as a reversible actuator (4). The disadvantage of these components, namely a slow response time, is compensated by the use of a pre-crash sensor (3) which can emit a reliable signal of the imminent collision before the actual impact. The time advantage gained in this manner is used in part, to compensate for the longer response times of the actuators in relation to non-reversible, pyrotechnic propellants and in part to drive the bonnet (2) into a raised position prior to the impact. The system protects pedestrians and cyclists and creates additional distance between the bonnet (2) and the engine block (5), in order to prevent the head of the person from hitting the latter (5). |
