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:
Aug. 08, 1978
Filed:
Feb. 19, 1976
Wolf-Dietrich Frobenius, Asperg, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
The fuel injection control pulses of an internal combustion engine may be shortened or lengthened to provide operation of the engine at a definite fuel-air ratio. When operation takes place in a leaned-out region, the engine suffers dynamic instability, resulting in rapid fluctuations of the rotational crankshaft velocity, superimposed on regular, periodic changes due to compression changes. The crankshaft speed is tested at two different locations of the angular path by passing markers in front of an inductive transducer. The output signal from this transducer gates the counting input of a digital counter which is supplied with a pulse train at a constant, high frequency. A flip-flop alternately causes upward and downward counting in the counter so that a net difference of counted pulses is formed after each two successive counting periods. This difference is normally positive but, when irregular fluctuations in the crankshaft speed occur due to the effects of leaned-out operation, these differences may be negative. The most significant bit of the counter indicates this condition and the frequency of its occurrence is integrated and used as a signal to adjust the fuel injection pulses.