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. 24, 1989
Filed:
Apr. 23, 1986
Nippondenso Co., Ltd., Kariya, JP;
Abstract
A rotation signal Ne is generated for every 1.degree. of rotation of the engine crankshaft together with a crankshaft angle signal G for every 360.degree. of crankshaft rotation. In response to each rotation signal Ne, a pseudo random number generator generates random number data which is converted to analog data by a D/A converter and supplied to a comparator circuit. An intake air pressure detection data Pim is also supplied to the comparator circuit and the two signals are compared. When the detection data Pim is larger than the converted analog data, the comparator output level is high. The output from the comparator is read for every rotation signal Ne and, when the detection data is larger than the analog data from the D/A converter, a counter is incremented. The count value is read for every generation of the crankshaft signal G and is supplied to the engine control unit as the intake air pressure detection data. The counter is then reset to the initial count value.