Knocking state determination device

Details Knocking state determination device Knocking state determination device

2008-09-16

2008-09-16

Kwok, Helen C. (Department: 2856)

Measuring and testing

Engine detonation

C073S035040, C123S406380

Reexamination Certificate

active

11475231

ABSTRACT:
An engine ECU executes a program including a step of calculating intensity values LOG(V) based on signals transmitted from a knock sensor; a step of deciding a maximum value V(MAX) in frequency distribution of intensity values LOG(V) for N cycles (N is a natural number); a step of calculating a knock determination level V(KD) based on the frequency distribution; a step of, when the knock determination level V(KD) is smaller than the maximum value V(MAX), removing V(MAX) from the frequency distribution; and a step of counting the total frequency of removed maximum values V(MAX) as knock occupancy KC. Maximum values V(MAX) are removed until the knock determination level V(KD) and the maximum value V(MAX) coincide, and the knock determination level V(KD) is recalculated.

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