EP0155680A2
Expired / Lapsed
EP
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Ignition timing controlling apparatus for internal combustion engine
Assignee: Hitachi Ltd
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Filing: 1985-03-20
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Granted: —
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Expires: 2005-03-20
Abstract
Abstract @ An angle of an ignition timing for a specific cylinder is gradually advanced. A comparison is made between the previous output of a knock detection circuit for the cylinder having its angle advanced and the present output thereof by a comparator (107). The comparator (107) evaluates an occurrence of a knock when an output signal therefrom changes drastically. The signal (111) from the comparator (107) rewrites the knock evaluation reference value in each cylinder written in the memory (108). When an output from the knock sensor (101) is larger than that of the memory (108), an ignition timing retard angle signal is output from the comparator (109). As a result, the apparatus of the present invention can control ignition timing without errors due to the deterioration with age or manufacturing errors, as it can correct knocking detection sensibility of the apparatus.
Inventors
- 👤 Yuichi Kashimura
- 👤 Noboru Sugiura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 20:23
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/152; F02P5/1525; F02P5/1522; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
99 words
An apparatus for controlling ignition timing for an internal combustion engine comprising a knock sensor, a. memory into which a knock evaluation reference value is written, and an evaluation circuit which produces an ignition timing angle delay signal when the signal from said knock sensor exceeds said knock reference value written into said memory, characterized in that further comprising means (706) for gradually advancing an angle of an ignition timing for a specific cylinder, and means (110, 108) for re-writing the knock evaluation reference value of said memory (108) when a knock is generated by said advancing means (706).
Claim 2
Independent Claim
99 words
An apparatus for controlling ignition timing for an internal combustion engine comprising a knock sensor, a. memory into which a knock evaluation reference value is written, and an evaluation circuit which produces an ignition timing angle delay signal when the signal from said knock sensor exceeds said knock reference value written into said memory, characterized in that further comprising means (706) for gradually advancing an angle of an ignition timing for a specific cylinder, and means (110, 108) for re-writing the knock evaluation reference value of said memory (108) when a knock is generated by said advancing means (706).
Claim 3
Dependent Claim
54 words
An apparatus for controlling ignition timing for an internal combustion engine as defined in claim 1, characterized in that a predetermined time has proceeded since a reference crank angle signal (REF) from a crank angle sensor (40) is generated, or a number of predetermined cycles of said reference crank angle signal (REF) is generated.
Claim 4
Dependent Claim
67 words
An apparatus for controlling ignition timing for an internal combustion engine as defined in claim 1, characterized in that said means (706) for gradually advancing an angle of an ignition timing for a specific cylinder is operated when an engine revolution number (REF) and engine load (L) are within a preset area after a reference crank angle signal (REF) from a crank angle sensor (40) is generated.
Claim 5
Dependent Claim
73 words
An apparatus for controlling ignition timing for an internal combustion engine as defined in claim 1, characterized in that said means (706) for gradually advancing an angle of an ignition timing for a specific cylinder have means (808, 809, 810) for further advancing an angle of an ignition timing of said specific cylinder when the knock signal of said specific cylinder previously advanced its angle of the ignition timing does not increase drastically.'
Claim 6
Dependent Claim
80 words
An apparatus for controlling ignition timing for an internal combustion engine as defined in claim 1, characterized in that said means (706) for gradually advancing an angle of an ignition timing for a specific cylinder have means (811) for correcting a knock detection number pulses (N s ) previously stored in said memory (108) for each cylinder based on the knock signal when said knock signal of said specific cylinder previously advanced its angle of the ignition timing increases drastically.
Claim 7
Dependent Claim
86 words
An apparatus for controlling ignition timing for an internal combustion engine as defined in claim 1, characterized in that said means (110, 108) for re-writing the knock evaluation reference value of said memory (108) has means (904,.905, 906) for outputting a signal (111) to said memory (108) for correcting a knock detection signal stored in said memory (108) of each cylinder, when a corresponding value of a present knock detection signal is larger than that of a previously measured knock detection signal of said specific cylinder.
Claim 8
Dependent Claim
29 words
An apparatus for controlling ignition timing for an internal combustion engine as defined in claim 1, characterized in that said knock evaluation reference value is a number of pulses.
Claim 9
Dependent Claim
51 words
An apparatus for controlling ignition timing for an internal combustion engine as defined in claim 1, characterized in that said memory (108) alternates said knock evaluation reference value in each cylinder based on a knocking pulse correction signal (111) output from said means (110, 108) for re-writing said knock evaluation value.
References Cited (Backward Citations)
No citation records indexed.
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