The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 10, 1995
Filed:
Jun. 03, 1992
James F Bates, Jr, Fond du Lac, WI (US);
A&E Manufacturing Co., Inc., Racine, WI (US);
Abstract
A device for testing the mass airflow sensor for a motor vehicle provides for connecting the positive and negative terminals of dc source to the corresponding positive and negative terminals on the mass airflow sensor. A circuit comprised of an LED and a resistor connected in series has one end connected to the positive terminal of the dc source and another end connected to the signal output terminal of the MAF sensor during a test. If, after the tester is connected to the dc source and to the MAF sensor the LED does not flash at all or burns continuously, it is a first indication of a defective MAF sensor. Because the flash or pulse rate of the signals driving the LED are too fast for visual counting, a tachometer or frequency meter is connected between the LED circuit and the negative terminal of the dc source. The meter needle deflects on a scale calibrated in terms of frequency or engine rpm which quantities are both related to mass airflow. The relationship between airflow variations as represented by the tachometer or frequency meter readings is determined by referring the meter readings to charts provided by the manufacturer of the mass airflow sensor.