Knock control system for internal combustion engines

Patent · Tue Oct 13 04:00:00 EDT 1987

OSTI ID:5776975

Haraguchi, H; Sakakibara, K

A knock control system is described for use with an internal combustion engine comprising: a knock sensor for detecting knock produced by the internal combustion engine; knock discriminating means for discriminating knock based on an output signal from the knock sensor; processor means responsive to the result of knock discrimination for computing a control value to control a knock control factor for the internal combustion engine and for changing the knock control factor according to the computed control value; detector means for detecting a maximum value of the output signal of the knock sensor during a prescribed period; discrimination level setting means for setting a knock discrimination level for use in the knock discriminating means; corrective level setting means for setting at least two correction levels to correct the knock discrimination level set by the discrimination level setting means; comparator/counter means for comparing the maximum value of the output signal of the knock sensor with at least two corrective levels and counting occurrences in which the maximum value exceeds the corrective levels; and level correcting means for correcting the knock discrimination level dependent on the counts of such occurrences.

• Assignee: Nippondenso Co., Ltd., Kariya
• Patent Number(s): US 4699106
• OSTI ID: 5776975
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
ACOUSTIC MEASUREMENTS
COMPARATOR CIRCUITS
CONTROL
CONTROL SYSTEMS
COUNTING TECHNIQUES
ELECTRONIC CIRCUITS
ENGINES
EQUIPMENT
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
MONITORING
MONITORS
NOISE POLLUTION CONTROL
OPERATION
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT