ROTATIONAL ANGLE DETECTOR

• Main Authors: SHINJIYOU IZURU, IKEUCHI MASAYUKI
• Format: Patent
• Language: English
• Published: 14.05.1992
• Subjects: BASIC ELECTRONIC CIRCUITRY; BLASTING; CODE CONVERSION IN GENERAL; CODING; COMBUSTION ENGINES; CONTROLLING COMBUSTION ENGINES; DECODING; ELECTRICITY; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; IGNITION, OTHER THAN COMPRESSION IGNITION, FORINTERNAL-COMBUSTION ENGINES; LIGHTING; MECHANICAL ENGINEERING; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES; WEAPONS

PURPOSE:To improve SN ratio with no low-pass filter required by integrally constituting a waveform shaping circuit with an electromagnetic pickup, and also providing an integrator which integrates an output signal to serve as the reference voltage relating to a comparator in the waveform shaping circuit. CONSTITUTION:An electromagnetic pickup 10A, which is arranged so that it is opposed to a disc 1 further to a magnetic protrusion 2 rotated synchronized with a crankshaft of an internal combustion engine, has a core 11 opposed to the magnetic protrusion 2, coil 13 wound on a bobbin 12 provided around the core 11 and a magnet 14 or the like magnetically coupled to an end face of the core 11, and these core 11, coil 13 and magnet 14 are integrally fixed to coated with a mold case 16. Here, a waveform shaping circuit 20A is formed in a hybrid IC and integrally constituted with the electromagnetic pickup 10A. The waveform shaping circuit 20A is constituted by providing an integrator 25 for integrating an output signal A of the electromagnetic pickup 10A to serve as reference voltage VR of a comparator 21 and the comparator 21 for comparing the output signal A with the reference voltage VR to produce a square wave B of reducing an influence by a pulsation noise component.