Ignition timing control device of an engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorMamoru Yoshioka
Life of this patent
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Abstract
An ignition timing control device including a mass flow meter arranged in the intake passage. At the time engine warmup, at high load operation where the mass flow rate of the intake air is higher than the reference value, the ignition timing is made a basic ignition timing for engine warmup. As opposed to this, in medium load operation, where the mass flow rate of the intake air is lower than the reference value, the ignition timing is retarded from the basic ignition timing of engine warmup. When the atmospheric pressure falls, the reference value is lowered.
Claims11
An ignition timing control device for an engine having a spark plug, comprising:
- ignition timing control means for controlling ignition timing, when the engine is warming up, to a warm-up reference ignition timing advanced relative to a warmed-up reference ignition timing when a representative value changing in accordance with atmospheric pressure is one of higher than a predetermined first reference value representing a high engine load and lower than a predetermined second reference value representing a low engine load, the ignition timing control means retarding the ignition timing relative to the warm-up reference ignition timing when the representative value is lower than the first reference value and higher than the second reference value;
- and
- reference value control means for lowering the first reference value while maintaining the second reference value unchanged when the atmospheric pressure falls below a normal atmospheric pressure.
Dependencies are inferred from the claim text.