Combustion chamber inlet temperature corrected combustion initia

Internal-combustion engines – Charge forming device – Fuel injection system

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123421, F02P 504

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active

044247834

ABSTRACT:
A four stroke internal combustion engine includes a time averaging temperature sensor disposed in the inlet passage to a combustion chamber sufficiently close to the inlet valve that it is exposed to the residual exhaust gases temporarily expanding backward into the inlet passage upon the opening of the inlet valve and the intake air during the subsequent intake stroke for relative times roughly proportional to the volume proportion of the mixture in the combustion chamber at the beginning of the compression stroke. The resultant combustion chamber inlet temperature is thus a more accurate approximation of the mixture than the temperature of intake air alone. A linear speed advance combustion initiation curve of slope s.sub.1 is calibrated for a normal warm mode of engine operation at a predetermined combustion chamber inlet temperature T.sub.1 and a modified slope s.sub.2 is determined during engine operation from measured combustion chamber inlet temperature T.sub.2 and the stored values of s.sub.1 and T.sub.1. Slope s.sub.2 is multiplied by crankshaft rotational speed (RPM) to give the actual speed advance for combustion initiation.

REFERENCES:
patent: 3543738 (1970-12-01), Barker et al.
patent: 4104998 (1978-08-01), Fenn
patent: 4112891 (1978-09-01), Spaulding
patent: 4231091 (1980-10-01), Motz

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