System for detecting the transient state of engine operation

Claim 1

A system for detecting a transient state of engine operation of an internal combustion engine having a spark ignition system and an air-fuel ratio control system, comprising a waveform shaping circuit means for producing an output pulse train dependent on an ignition pulse train of said spark ignition system, a measuring circuit means for measuring each pulse separation of said output pulse train and for producing a corresponding data output and for producing timing pulses for synchronizing operations of component circuits of the system, a memorizing circuit means, including circuit means for producing a mean value of at least two sequential of most recent old said data outputs, for memorizing said mean value of said old data outputs, and a subtractor means for producing a subtraction output dependent on a difference between said mean value of said old data outputs from said memorizing circuit means and a new said data output from said measuring circuit means thereby detecting the transient state and operatively connected to the air-fuel ratio control system to supply the subtraction output to the air-fuel ratio control system for the control thereof.

Claim 2

A system for detecting a transient state of engine operation of an internal combustion engine having a spark ignition system and an air-fuel ratio control system, comprising a waveform shaping circuit means for producing an output pulse train dependent on an ignition pulse train of said spark ignition system, a measuring circuit means for measuring each pulse separation of said output pulse train and for producing a corresponding data output and for producing timing pulses for synchronizing operations of component circuits of the system, a memorizing circuit means, including circuit means for producing a mean value of at least two sequential of most recent old said data outputs, for memorizing said mean value of said old data outputs, and a subtractor means for producing a subtraction output dependent on a difference between said mean value of said old data outputs from said memorizing circuit means and a new said data output from said measuring circuit means thereby detecting the transient state and operatively connected to the air-fuel ratio control system to supply the subtraction output to the air-fuel ratio control system for the control thereof.

Claim 5

A system for detecting a transient state of engine operation of an internal combustion engine having a spark ignition system producing an ignition pulse train having a pulse period dependent on engine load and speed, respectively, and an air-fuel ratio control means for controlling the air-fuel ratio of an air-fuel mixture supplied to the engine, comprising means for continuously measuring a pulse period corresponding to said ignition pulse train, means for continuously memorizing the measured pulse period, means for subtracting a presently measured pulse period from at least one most recent previously measured, memorized pulse period so as to detect the transient state by existence of a difference therebetween, said air-fuel ratio control means being operatively connected to said subtracting means and for controlling the air-fuel ratio of the air-fuel mixture supplied to said engine dependent on the difference between said presently measured pulse period and said previously measured, memorized pulse period.

Claim 6

A system for detecting a transient state of engine operation of an internal combustion engine having a spark ignition system producing an ignition pulse train having a pulse period dependent on engine load and speed, respectively, and an air-fuel ratio control means for controlling the air-fuel ratio of an air-fuel mixture supplied to the engine, comprising means for continuously measuring a pulse period corresponding to said ignition pulse train, means for continuously memorizing the measured pulse period, means for subtracting a presently measured pulse period from at least one most recent previously measured, memorized pulse period so as to detect the transient state by existence of a difference therebetween, said air-fuel ratio control means being operatively connected to said subtracting means and for controlling the air-fuel ratio of the air-fuel mixture supplied to said engine dependent on the difference between said presently measured pulse period and said previously measured, memorized pulse period.

Claim 7

A method for detecting a transient state of engine operation of an internal combustion engine, and controlling the latter thereupon, with a spark ignition system producing an ignition pulse train with a pulse period dependent on engine load and speed, respectively, and an air-fuel ratio control means for controlling the air-fuel ratio of an air-fuel ratio mixture supplied to the engine, comprising the steps of continuously measuring a pulse period corresponding to that of said ignition pulse train, continuously memorizing the measured pulse period, subtracting a presently measured pulse period from an average of at least two most recent previously measured and memorized pulse periods so as to detect a difference and thereby the transient state, controlling the air-fuel ratio of the air-fuel mixture supplied to said engine dependent on said difference.

Claim 8

A method for detecting a transient state of engine operation of an internal combustion engine, and controlling the latter thereupon, with a spark ignition system producing an ignition pulse train with a pulse period dependent on engine load and speed, respectively, and an air-fuel ratio control means for controlling the air-fuel ratio of an air-fuel ratio mixture supplied to the engine, comprising the steps of continuously measuring a pulse period corresponding to that of said ignition pulse train, continuously memorizing the measured pulse period, subtracting a presently measured pulse period from an average of at least two most recent previously measured and memorized pulse periods so as to detect a difference and thereby the transient state, controlling the air-fuel ratio of the air-fuel mixture supplied to said engine dependent on said difference.