Process for controlling knocking in internal combustion engines

Details Process for controlling knocking in internal combustion engines Process for controlling knocking in internal combustion engines

1992-06-11

1993-09-14

Argenbright, Tony M.

Internal-combustion engines

Combustion chamber means combined with air-fuel mixture...

F02P 515

Patent

active

052439429

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates generally to a process for controlling the knocking in an internal combustion engine.
More particularly it relates to such a process for controlling the knocking in an internal combustion engines which includes characteristic diagram which, depending on the value of operating parameters of the internal combustion engine, has subdivided areas, with one value of an ignition retardation, determined during operation in the relevant range, always being stored (this takes place in particular on leaving this range), on changing into this range. represents a critical operational state which can adversely affect the working life of the engine. The so-called anti-knock control is a well known method which, on sensing knocking in a cylinder of an internal combustion engine, retards the ignition angle. Knocking can be eliminated in this way. After a certain period of time has elapsed, the ignition angle is reset in the direction of "advance". For preference, this resetting is undertaken in steps, i.e. in retardation, the ignition angle is moved by a relatively large step which, on resetting, is reduced by relatively small equispaced steps, until knocking reoccurs or a preset value of the ignition angle is reached without any occurrence of knocking. An adaptation characteristic diagram is also envisaged which, depending on the size of the operating parameters of the engine, has subdivided ranges. In each range, the value of an ignition angle retardation which was determined in this range during operation, is stored on leaving this range (this can also be the value of the ignition angle of retardation which obtains on leaving the range). If the range is changed, i.e. if a new range is entered, then the operational control starts with the value of the ignition retardation angle, which is stored there when this range is entered. If this proves to be too great for the prevailing operating condition, i.e. if it is retarded too far, then it is reset in accordance with the anti-knock control algorithm.


SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide process for controlling the knocking in an internal combustion engine, which avoids the disadvantages of the prior art.
In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in the process of controlling the knocking of an internal combustion engine, including retarding the ignition angle when a cylinder knocks; resetting the ignition angle by adjustment in the direction of "advance"; storing prevailing ignition angle retardation values in an adaptation characteristic diagram, which depending on the size of operating parameters of the internal combustion engine, has subdivided ranges, with one value of an ignition angle retardation, determined during operation in the appropriate range, in particular on leaving this range, always being stored; setting of the value of the ignition angle retardation as stored for a particular range, on changing into this range, wherein in accordance with the present invention on changing the range the resetting of the ignition angle takes place with increased advance adjustment speed until knocking occurs in this range or until a predetermined value of the ignition angle is reached.
When the process for controlling the knocking is performed in accordance with the present invention, it has the advantage that on changing ranges of the adaptation characteristic diagram, the optimum ignition angle for the prevailing operating condition is rapidly adopted. Starting from the ignition retardation angle stored in each case, the operating condition is rapidly approached to the prevailing knock threshold. When this has taken place, anti-knock control follows the usual course, i.e. if knocking occurs in the new range, then initially, a retardation of ignition will again be made, followed by resetting of the ignition angle in the direction of "advance", which, however

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patent: 4527524 (1985-07-01), Guipaud
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Patent Abstracts of Japan, vol. 8, No. 146, (M-307) (1583), Jul. 7, 1984.

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