Internal-combustion engines – Noncompression
Patent
1977-10-17
1979-02-20
Myhre, Charles J.
Internal-combustion engines
Noncompression
123 32EB, 123119EC, 364431, F02B 502, G06F 1520, F02M 700
Patent
active
041400836
ABSTRACT:
A fuel mixture control system, for example a fuel injection system, has a control device which accepts signals for final correction of the fuel mixture. In particular, the final correction is made on the basis of engine roughness which is used as a measure of the degree of lean burning of the engine. The engine roughness is determined digitally by forming second differences of engine period in sequential digital counters whose contents are shifted after each counting period. The final counter is counted down at an rpm-dependent frequency. The digital datum related to engine roughness is examined for two conditions, i.e., for whether it exceeded a set-point value and for the nature of its algebraic sign. In one of the four possible states of combination of these conditions, the mixture is slightly enriched, whereas in the other three states, it is leaned out to a maximum degree.
REFERENCES:
patent: 3789816 (1974-02-01), Taplin et al.
patent: 4044234 (1977-08-01), Frobenius et al.
patent: 4044235 (1977-08-01), Frobenius
patent: 4044236 (1977-08-01), Bianchi et al.
patent: 4073270 (1978-02-01), Endo
patent: 4091780 (1978-05-01), Masaki et al.
patent: 4092955 (1978-06-01), Reddy
Greigg Edwin E.
Lall P. S.
Myhre Charles J.
Robert & Bosch GmbH
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