Method and apparatus for optimizing a controllable adjustment pa

Details Method and apparatus for optimizing a controllable adjustment pa Method and apparatus for optimizing a controllable adjustment pa

1985-09-12

1986-07-08

Cox, Ronald B.

Internal-combustion engines

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

123501, 123435, F02P 504

Patent

active

045986800

ABSTRACT:
For optimization of the ignition timing of an internal combustion engine, the crankshaft angle at which the maximum combustion chamber pressure is measured is determined for one or all of the cylinders of the engine, and is used as the report value for comparison with reference value to produce an error signal that is capable of shifting the ignition timing to an optimal value. Optimization is accomplished by modifying the reference value in a manner controlled by the measurement of the work done in each of the cylinders, as computed from a crankshaft angle signal in a combustion chamber pressure signal, the work done signal being multiplied by the error signal before being furnished to an integrating controller that averages the multiplier output with the results obtained for previous cycles of the engine to produce the reference value signal. The multiplication of the work done signal by the error signal makes the jist of the reference value signal proportional to the error signal magnitude. The optimization is stable both quick response to changes in engine load and in long-term changes of engine operating conditions, such as those related to engine temperature.

REFERENCES:
patent: 3875912 (1975-04-01), Bullo
patent: 3957023 (1976-05-01), Peterson
patent: 4054111 (1977-10-01), Sand
patent: 4131097 (1978-12-01), Sawada
patent: 4153019 (1979-05-01), Laubenstein
patent: 4449501 (1984-05-01), Greeves
patent: 4455980 (1984-06-01), Sasayama

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