Composite piezoelectric-thermoelectric automobile exhaust gas micro energy collector

The invention provides a composite piezoelectric-thermoelectric automobile exhaust gas micro energy collector. One end of a cantilever beam is fixedly connected to a support base, and the other end extends along a horizontal direction to form a free end. A mass block is fixed at the free end of the cantilever beam. A piezoelectric sheet is fixed on an upper surface of the cantilever beam. Film electrodes are respectively located on the upper and lower surfaces of the piezoelectric sheet. A heat radiation piece is fixed to the upper surface of an upper film electrode. An energy collector is placed on an outer tube wall of an automobile exhaust pipe. The cantilever beam is subjected to the vibration of an automobile to generate vibration, and the piezoelectric sheet senses the vibration of the cantilever beam to generate an electric charge which is taken out by the film electrodes. The lower surface of the piezoelectric piece receives the heat of exhaust gas conducted from an exhaust tube wall, the heat radiation piece is placed on the upper surface of the upper film electrode, thus a temperature change is caused on the piezoelectric sheet, the charge is generated by a pyroelectric effect and then is led out through film electrode leads, and power is supplied to a gas monitoring sensor.