The invention discloses a trigger of an automatic lifting system of an automobile front cover. The trigger structurally comprises an ignition mechanism, a gas production medicine box, a supporting cylinder, a piston rod and a gas production medicine. An ignition mechanism is arranged at the inner lower end of the supporting cylinder, a gas production medicine box is arranged at the upper end of the ignition mechanism, and the gas production medicine is contained in the gas production medicine box; the ignition mechanism is controlled by an automobile ECU. A piston rod is arranged at the upperend of the gas production medicine box, the upper part of the supporting cylinder is open and can allow the piston rod to extend out, and an exhaust hole penetrating through the supporting cylinder isformed in the upper side part of the supporting cylinder; the piston rod is of a hollow structure with the closed lower end, a spring is arranged at the inner lower end of the piston rod, and an ejector rod is arranged at the upper end of the spring. Limiting holes are formed in the ejector rod and the piston rod, and magnetic limiting columns for limiting bounce of the springs are arranged in the limiting holes. An electromagnetic force device capable of attracting the magnetic limiting columns outwards is arranged outside the supporting cylinder. The electromagnetic force device is controlled by the automobile ECU. The trigger can effectively improve protectiveness and safety, and is simple in structure and low in manufacturing cost.

本发明公开了一种汽车前罩盖自动抬升系统的触发器，其结构为：其包括点火机构、产气药盒、支撑筒、活塞杆和产气药；所述支撑筒的内下端设有点火机构，点火机构上端设有产气药盒，产气药盒内盛装产气药；所述点火机构由汽车ECU控制；所述产气药盒的上端设有活塞杆，支撑筒上部开口并可容活塞杆伸出，在支撑筒的上侧部开有贯通支撑筒的排气孔；所述活塞杆为下端封闭的中空结构，在活塞杆的内下端设有弹簧，在弹簧上端设有顶杆；所述顶杆和活塞杆上开有限位孔，限位孔内设有限制弹簧弹起的磁性限位柱；所述支撑筒外部设有可将磁性限位柱向外吸的电磁力装置；所述电磁力装置由汽车ECU控制。本触发器能有效的提升保护性、安全性，且结构简单、造价低。