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US 4,727,841 AGranted
System for controlling internal combustion engine using knocking and overtemperature preventing fuel correction
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKiyoo Hirose, Yoshihiko Matsuda
Life of this patent
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Abstract
In an internal combustion engine where the ignition timing is retarded to avoid knocking and an overtemperature of the engine, a fuel incremental amount is calculated by using a curvilinear function having a positive secondary differential value with respect to the retard amount of the ignition timing.
Claims10
A method for controlling an internal combustion engine comprising the steps of:
- calculating a base fuel amount in accordance with first predetermined parameters of said engine;
- calculating a base ignition timing in accordance with second predetermined parameters of said engine;
- calculating a retard amount of said base ignition timing in accordance with third predetermined parameters of said engine;
- calculating a fuel incremental amount by using a curvilinear function having a positive secondary differential value with respect to said retard amount of said base ignition timing;
- adjusting an actual air-fuel ratio in accordance with said base fuel amount corrected by said fuel incremental amount;
- and
- controlling an actual ignition timing in accordance with said base ignition timing corrected by said retard amount of said base ignition timing.
4 more elements
An apparatus for controlling an internal combustion engine comprising:
- means for calculating a base fuel amount in accordance with first predetermined parameters of said engine;
- means for calculating a base ignition timing in accordance with second predetermined parameters of said engine;
- means for calculating a retard amount of said base ignition timing in accordance with third predetermined parameters of said engine;
- means for calculating a fuel incremental amount by using a curvilinear function having a positive secondary differential value with respect to said retard amount of said base ignition timing;
- means for adjusting an actual air-fuel ratio in accordance with said base fuel amount corrected by said fuel incremental amount;
- and
- means for controlling an acutal ignition timing in accordance with said base ignition timing corrected by said retard amount of said base ignition timing.
4 more elements
Dependencies are inferred from the claim text.