Abstract: A smart mat includes a stepping potential generation unit, a computing processor and a transmission processor for sensing the stepping direction of a stepper to control the operation of a device. The stepping potential generation unit includes an upper mat, an isolating airgap layer, a lower mat and at least one high-resistance strips. When the stepper stands on the smart mat to press the stepping potential generation unit, a part of the stepping potential generation unit is pressed by an open-circuit state to form a closed circuit and generate a potential. The computing processor uses the distributed position of each potential and the time sequence of distributing each potential to compute and analyse a potential stepping process distribution area to obtain a stepping direction, so as to control the operation of the device through the transmission processor.

Abstract: The present invention relates to a structure for oxygen sensor of vehicles, having a fixture, a ceramics base, an oxygen sensing device, a ring binder and a pipe shroud, wherein the pair of tenons inside the fixture are inlaid into the ring binder's side fillisters. The ring binder is then rotated to have the tenons fit into the positioning fillisters so as to connect the fixture tightly with the ring binder. Finally, the ring binder is covered by a pipe shroud. With the revolving-to-stuck mechanism implemented on the joints between the fixture and the ring binder, it is convenient to repair or replace bad components during tests without damaging the fixture.

Abstract: An oxygen sensor used with an electronic control unit in a car and having a metal housing formed by a front cap, a rear cap and an intermediate barrel and secured by a lock nut. A probe is mounted in the metal housing to detect an amount of oxygen in exhaust gas from the car and to produce a voltage signal indicative of the amount of oxygen detected. A terminal transmits the voltage signal from the probe to an electronic control unit in the car. The oxygen sensor includes a water sealing plug fastened to the rear cap, a first ceramic holder element, a second ceramic holder element, an electrode washer connected between the first ceramic holder element and the probe, and a metal compression spring mounted inside the intermediate barrel to push the ceramic holder elements apart. A lead-out wire connected to the bottom end of the metal compression spring transmits the voltage signal from the probe to the electronic control unit in the car.