Peak combustion pressure signal processing circuit with diagnost

Details Peak combustion pressure signal processing circuit with diagnost Peak combustion pressure signal processing circuit with diagnost

1986-12-08

1987-12-08

Myracle, Jerry W.

Measuring and testing

Vehicle drive train

Rear end

73709, G01M 1500

Patent

active

047111194

ABSTRACT:
A peak combustion pressure signal processing circuit for an internal combustion engine having a plurality of combustion chambers with combustion pressure sensors includes an operational amplifier for each sensor with an output connected through a diode to a common junction. Each operational amplifier has a feedback circuit from the common junction to its input effective to cause its output voltage to decrease so as to reverse bias its output diode when the voltage on the common junction exceeds the voltage derived from the associated sensor, whereby only the diode passing the maximum combustion pressure signal is forward biased. A logic circuit having inputs from the common junction and the outputs of at least all but one of the operational amplifiers determines which diode is forward biased and assumes a uniquely identifiable output state.

REFERENCES:
patent: 3957023 (1976-05-01), Peterson
patent: 4406265 (1983-09-01), Brandt et al.
patent: 4481925 (1984-11-01), Karau et al.
patent: 4539841 (1985-09-01), Schroeder et al.

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