Electronic fuel injection control apparatus of an internal combustion engine
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorsKunihisa Hayashi, Masakazu Moriyama
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Abstract
Small change in the period of a crank-angle signal which is generated at every crankshaft rotation of a predetermined angle is not faithfully reflected to a false crank-angle signal which is used by a fuel injection control device for detecting the engine's running speed. Thus, even when the actual running speed is varied, the running speed recognized by the fuel injection control device doesn't change faithfully to this variation. Therefore, the amount of fuel injected into the engine, which amount is calculated in accordance with the running speed, doesn't vibrate with the variation of the running speed, preventing the surge phenomenon from occurring.
Claims6
An electronic fuel injection control apparatus of an internal combustion engine having a crankshaft, said apparatus comprising:
- means for generating a first electrical signal at every crankshaft rotation of a predetermined angle;
- means for generating a second electrical signal having a level which corresponds to a varying quantity in the period of said first electrical signal;
- means, in response to said first electrical signal, for generating a third electrical signal having a variable period, a varying quantity of said third electrical signal period being maintained at a constant value or constant values irrespective of the varying quantity of said first electrical signal period when said second electrical signal is smaller than or equal to a predetermined value, a varying quantity of said third electrical signal period being changed in response to the varying quantity of said first electrical signal period when said second electrical signal is greater than the predetermined value;
- and
- means for adjusting the amount of fuel injected into the engine, in response to the period of said third electrical signal.
Dependencies are inferred from the claim text.