Inductive sensor

About: Inductive sensor is a research topic. Over the lifetime, 2282 publications have been published within this topic receiving 21984 citations.

Study and Design of Ratiometric Inductive Position Sensors Using Area-of- Overlap Functions

Abstract: This article presents a theoretical study of an absolute, ratiometric inductive position sensor (IPS) based on eddy currents. The aim is to describe the working principle of the sensor, having as key components a transmitting coil, the receiving coils, and the conductive target, by introducing area-of-overlap functions. We show that each target–receiver pair needs the adoption of a different reconstruction formula for the identification of the target position, whereas in the literature the usual inverse tangent function is applied for every possible pair. Then, we seek the target–receiver pair that maximizes the amplitude of the induced voltages on the receivers. The results show that to achieve the maximum value of the induced voltages, the best choice is to have a rectangular target and rectangular receivers. To verify the theory, a simulation and optimization method has been applied to the rectangular receiver coils on two rotary IPS realized with printed circuit board (PCB) technology. Measurements performed on the prototypes have shown an increment of the induced voltage of more than 57% with respect to the commonly used sinusoidal receivers. However, a linearity error of 1.5%FS is obtained by using the inverse tangent reconstruction formula. When using the formula provided by the theory, the linearity error becomes 0.6%FS for the nonoptimized prototype and below 0.15%FS for the optimized one.

Novel electronic brake pedal and application method thereof

Abstract: A novel electronic brake pedal comprises a left support, a right support, an angular displacement sensor and a pedal spindle. The angular displacement sensor is a non-contact electromagnetic inductive sensor and comprises a sensor body and a sensor spindle, one end of the sensor spindle sequentially penetrates a left support hole formed in the left support, the pedal spindle and a right support hole formed in the right support to be matched with the inside of the sensor body in a rotating mode, and the other end of the sensor spindle is matched with the left support hole in a rotating mode. During usage, the pedal spindle is rotated firstly to enable the sensor body to generate induced currents inside, then, the sensor body converts the induced currents into two ways of voltage signals and outputs the two ways of voltage signals to an electronic control unit (ECU) of a whole vehicle. According to the novel electronic brake pedal, the service life of the angular displacement sensor is prolonged, abrasion between the sensor spindle and hole walls of the supports is low, assembling steps are simplified, and the production cost is reduced; and besides, the brake pedal can be matched with an HCU to achieve intelligent control of the whole vehicle while the safety of the whole vehicle is guaranteed.

Device provided with a rotation inductive sensor to control particularly the ignition time of combustion engines

Abstract: Induktiver Drehgeber zur Steuerung des Zundzeitpunkts von Brennkraftmaschinen, mit von einem Dauermagneten durchsetzter Spule und von einer Welle gedrehtem Jochrad, uber dessen Umfang verteilt vorspringende, beabstandete Zahnsegmente an den Magnetpolen zur Spannungsinduktion vorbeibewegt werden, wobei tangential benachbarte Zahnsegmente voneinander unterschiedlich weiten Abstand aufweisen.

Inductive sensor with digital demodulation

Abstract: An eddy current displacement sensor includes devices or modules for digitizing and interpreting analog signals received from sensor coils. Periodic analog signals, such as sinusoidal or square wave signals, are sent to the coils with a suitable frequency. The output from the coils is then digitized using one or more analog-to-digital converters, at a sampling rate (frequency) that may be greater than that of the frequency of the input signal. The digitized output signals may then be processed to determine displacement of an object relative to the sensor coils, for example using magnitude and/or phase of the digital signals to estimate position. Digitizing the analog output signals directly, rather than only after such signals have been converted to DC signals, allows improvement in processing, as well as enabling flexibility in how the signals are used to estimate position.

IC engine operational conditions recognition device - has belt with impulse transmitter marking and inductive sensor

Abstract: The device incorporates a toothed belt (1) with an impulse transmitter marking (4,5,6). The inductive sensor (8) is located within the passing area of the belt. A signal evaluator unit associates certain movement conditions of the cylinder-piston unit with the signal impulses. The number of teeth of the toothed belt is an integral multiple of the number of teeth of the crank shaft. The position of esp. a belt tooth is associated with a certain position of the piston in the unit, esp. an top dead centre (TDC) position. USE/ADVANTAGE - Motor vehicle. Combines good function with more economical manufacture and installation.