LPP sensor interface circuit

Details LPP sensor interface circuit LPP sensor interface circuit

1986-12-08

1988-02-16

Myracle, Jerry W.

Measuring and testing

Vehicle drive train

Rear end

330282, G01M 1500

Patent

active

047247029

ABSTRACT:
A low impedance interface circuit for use with an internal combustion engine between a capacitive piezoelectric combustion pressure sensor and LPP signal processing circuitry comprises an operational amplifier with a negative feedback capacitor and an input DC blocking capacitor, a voltage follower amplifier with a first resistor at its input and a second resistor at its output connecting it in parallel with the feedback capacitor, a DC filter capacitor connected to the input of the voltage follower amplifier and forming a low pass filter with the first resistor to maintain a substantially constant DC voltage equal to the DC operating voltage for DC feedback, a current source controlled by the output of the operational amplifier and connected in series with the first resistor to provide increased current for the charging of the DC filter capacitor and a diode bypassing the first resistor to allow fast charging of the DC filter capacitor and DC blocking capacitor during startup.

REFERENCES:
patent: 4406265 (1983-09-01), Brandt et al.
patent: 4481925 (1984-11-01), Karau et al.
patent: 4491010 (1985-01-01), Brandt et al.
patent: 4620438 (1986-11-01), Howng

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