Ignition timing control system for an internal combustion engine
AssigneeNissan Motor Co., Ltd.
InventorsYasuo Takagi, Michio Onoda, Masaaki Katsumata, Kenji Yoneda
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Abstract
An ignition timing control system for an internal combustion engine comprises first circuitry for producing a function of the intensity of combustion knock in each cylinder in a sequence, second circuitry for storing the function of each cylinder respectively in a memory circuit each of which corresponds to a specific cylinder, and third circuitry for determining the ignition timing of each cylinder by modifying the basic ignition timing determined by an advance mechanism, in accordance with the respectively stored functions.
Claims16
An ignition timing control system for an internal combustion engine, comprising:
- (a) first means for producing a function of respective intensities of combustion knock in each cylinder of said engine;
- (b) second means for respectively storing said function corresponding to each cylinder in a sequence;
- and
- (c) third means for determining respective ignition timings of each cylinder in accordance with the respectively stored functions by modifying the basic ignition timing determined by an advance mechanism,
- wherein said first means comprises:
- a knock sensor for producing an output signal indicative of the intensity of an impact of combustion knock in the cylinders of said engine,
- a band-pass filter responsive to said output signal of said knock sensor for transmitting only frequencies of combustion knock,
- a peak level detector for producing an output representing the peak level of the intensity of combustion knock in said cylinder,
- means for generating a reference signal which is variable in accordance with the engine rotational speed,
- a level detector for comparing said output signal of said peak level detector with said reference signal, and
- a subtractor for subtracting said level detector signal from the function stored by said second means to produce said function of respective intensities of combustion knock in each cylinder of said engine.
An ignition timing control system for an internal combustion engine, comprising:
- means for producing a function signal of the intensity of combustion knock in each cylinder of said engine;
- means for storing said function signal corresponding to each cylinder in a sequence;
- and
- means for determining the ignition timing of each cylinder in accordance with the respectively stored function signals by modifying the basic ignition timing determined by an advance mechanism,
- wherein said producing means comprises means for generating a reference signal variable with the engine speed of said engine, a peak level detector for producing a peak level signal indicative of the peak level of the intensity of combustion knock in each cylinder, a level detector for comparing said peak level signal with said reference signal to produce a level detection signal, and a subtractor for subtracting said level detection signal from said function signal stored in said storing means to produce said function signal to be produced from said first means.
A method for controlling the ignition timing of an internal combustion engine, comprising:
- a first step for producing a function signal of the intensity of combustion knock in each cylinder of said engine;
- a second step for storing said function signal corresponding to each cylinder in a sequence;
- and
- a third step for determining the ignition timing of each cylinder in accordance with the respectively stored function signals by modifying the basic ignition timing determined by an advance mechanism,
- wherein said first step comprises following each of the steps of:
- generating a reference signal variable with the engine speed of said engine;
- detecting a peak level of the intensity of combustion knock in each cylinder;
- producing a level detection signal by comparing said peak level detection signal with said reference signal;
- and subtracting said level detection signal from said stored function signal to produce said function signal.
Dependencies are inferred from the claim text.