Method of discriminating octane number of fuel for motor vehicle

Details Method of discriminating octane number of fuel for motor vehicle Method of discriminating octane number of fuel for motor vehicle

1987-05-02

1987-11-24

Argenbright, Tony M.

Internal-combustion engines

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

73 35, F02P 515

Patent

active

047081139

ABSTRACT:
Knocking in an engine is prevented from occurring by retarding an ignition timing. A basic ignition advance angle THB and a correction value THK for retardation of the ignition timing are computed in order that the ignition timing THF is calculated by using the formula THF=THB-THK. The knocking in the engine tends to take place, as the ignition timing advances. Determination is made as to whether the correction value THK is within a reference range AR. When such a determination is that the correction value THK is within the reference range, discrimination is made as to whether an octane number of the fuel to be supplied to the engine is less than a predetermined octane number of the fuel which is optimum for the engine. If the discriminated octane number of the fuel is less than the predetermined octane number, the ignition timing is retarded by 10 degree of a rotational angle of a crank shaft.

REFERENCES:
patent: 3822583 (1974-07-01), Keller et al.
patent: 4243007 (1981-01-01), Ehrhardt et al.
patent: 4586475 (1986-05-01), Takahashi et al.
patent: 4594982 (1986-06-01), Takahashi et al.
patent: 4594983 (1986-06-01), Takahashi et al.
patent: 4612900 (1986-09-01), Iwata et al.
patent: 4612901 (1986-09-01), Iwata et al.

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