Knock control apparatus for internal combustion engines

Patent · Tue Jul 15 04:00:00 EDT 1986

OSTI ID:5393987

Sugiura, N

A knock control apparatus is described for internal combustion engines comprising: an amplifier for amplifying a signal generated from a knock sensor for detecting vibration of an engine; a filter for passing a knocking frequency range of an output from the amplifier; a rectifier circuit for rectifying an output from the rectifier at a clamping voltage; background level detecting means for averaging an output from the clamping means; means for generating the clamping voltage at which the clamping means clamps the output from the rectifier on the basis of the average voltage from the background level detecting means so that the clamping voltage will continuously change in accordance with changes in the average voltage from the background level detecting means; and means for comparing the output from the filter with an output value from the background level detecting means to generate a signal for retarding an ignition timing in accordance with a knock intensity.

• Assignee: Hitachi, Ltd., Tokyo
• Patent Number(s): US 4599982
• OSTI ID: 5393987
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
AMPLIFIERS
COMPARATOR CIRCUITS
CONTROL
CONTROL SYSTEMS
DIGITAL FILTERS
ELECTRIC POTENTIAL
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
ENGINES
EQUIPMENT
FREQUENCY CONTROL
HEAT ENGINES
IGNITION SYSTEMS
INTERNAL COMBUSTION ENGINES
KNOCK CONTROL
MEASURING INSTRUMENTS
MONITORS
RECTIFIERS
SIGNALS
TIMING PROPERTIES
VOLTAGE REGULATORS