Voltage source for ion current measurement in an internal combus

Details Voltage source for ion current measurement in an internal combus Voltage source for ion current measurement in an internal combus

1981-02-17

1982-11-23

Woodiel, Donald O.

Measuring and testing

Vehicle drive train

Rear end

73116, 324460, G01M 1500

Patent

active

043598935

ABSTRACT:
A voltage source for measurement of pressure fluctuations in internal combustion engine cylinders by current detected between the electrodes of the sparkplug after the spark has died down, is derived from the ignition voltage. A capacitor can be charged to a voltage of a few hundred volts for this purpose in various ways, and either a positive or a negative measurement voltage can be provided with respect to ground across a measuring resistor for further processing. Very few additional components are required. It is possible to provide a voltage that is continuously available for the convenience of timing the measurement and for the capability of making the measurement and all of the cylinders of the engine.

REFERENCES:
patent: 3168695 (1965-02-01), Fales
patent: 4232545 (1980-11-01), Dobler et al.
patent: 4307603 (1981-12-01), Dobler et al.
patent: 4312215 (1982-01-01), Dobler et al.

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