Ignition timing control apparatus for internal combustion engine

Patent · Tue Sep 09 00:00:00 EDT 1986

OSTI ID:5232041

Iwata, T

An ignition timing control apparatus is described for an internal combustion engine comprising: vibration acceleration sensing means for sensing knock signals of the engine; means responsive to the output of the sensing means for deriving the knock signals including a bandpass filter connected to the sensing means to pass therethrough only a frequency component inherent in the knocks, a noise level detector for converting the output of the bandpass filter into a DC voltage with a predetermined amplification, the DC voltage being higher than the noise component while lower than the knock component of the filtered output, and a comparator for comparing the outputs of the filter and the noise level detector to derive the knock signals; means responsive to the output of the knock signal deriving means for determining whether the current ignition timing characteristic is required to be changed over including a pulse generator connected to the comparator to generate one pulse per the occurrence of knock during one ignition and a counter connected to the pulse generator to count the output pulses of the pulse generator and to provide a logic signal indicating the presence of a predetermined knock occurrence rate per a predetermined time interval defined by a timer.

• Assignee: Mitsubishi Denki Kabushiki Kaisha, Tokyo
• Patent Number(s): US 4610232
• OSTI ID: 5232041
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330100* -- Internal Combustion Engines
ACCELERATION
COMPARATOR CIRCUITS
COMPUTERIZED CONTROL SYSTEMS
CONTROL
CONTROL SYSTEMS
CURRENTS
DIRECT CURRENT
ELECTRIC CURRENTS
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
ENGINES
EQUIPMENT
FUNCTION GENERATORS
HEAT ENGINES
IGNITION SYSTEMS
INTERNAL COMBUSTION ENGINES
KNOCK CONTROL
MECHANICAL VIBRATIONS
NOISE
PULSE GENERATORS
PULSES
SIGNALS
TIMING CIRCUITS
TIMING PROPERTIES