Apparatus for detecting combustion state in internal combustion

Details Apparatus for detecting combustion state in internal combustion Apparatus for detecting combustion state in internal combustion

1996-11-01

1998-05-05

Oda, Christine K.

Measuring and testing

Engine detonation

Specific type of detonation sensor

G01L 2322

Patent

active

057476705

ABSTRACT:
A combustion state detecting apparatus for an internal combustion engine capable of detecting combustion state in the engine with high accuracy and reliability by deriving an ion current detection signal which is based on only an ion current by canceling out a leakage current component. The apparatus includes a high-voltage diode (11a, . . . , 11d) connected to a spark plug (8a, . . . , 8d), a bias voltage applying circuit (9) for applying a bias voltage (VBi) to the spark plug by way of the high-voltage diode, an ion current detecting circuit (12) for detecting an ion current (i) flowing through the spark plug immediately after ignition to thereby output an ion current detection signal (Ei), an electronic control unit (2) for determining combustion state of the engine on the basis of the ion current detection signal (Ei), and a leakage current compensating means (21, 22) connected in parallel with the ion current detecting means (12). The leakage current compensating means supplies a compensating current (ic) for canceling out a leakage current component (iL) flowing along a same path as the ion current (i). The ion current detecting means outputs as the ion current detection signal only an ion current signal component (io) from which the leakage current has been eliminated.

REFERENCES:
patent: 5561239 (1996-10-01), Yasuda
patent: 5563332 (1996-10-01), Yasuda

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