Knock control system for automotive engines
An improved knock control system is described for an automotive engine, of the type having an ignition system, a knock sensor for sensing vibration of the engine, and a knock control unit comprising a knock detecting circuit responsive to an output signal of the knock sensor for producing a knock signal. The improvement comprises: an exhaust gas temperature sensor for producing a temperature signal when the exhaust gas temperature exceeds a predetermined temperature; a correcting circuit responsive to a retard signal, fail-safe signal and the temperature signal for producing a correction signal which is applied to the ignition system to control the ignition timing, the correction circuit being so arranged to respond to the temperature signal to reduce the retardation degree decided by the fail-safe signal; an engine speed detecting circuit for producing an engine speed signal when engine speed exceeds a predetermined value; and a switching circuit responsive to the engine speed signal to further reduce the retardation degree decided by the fail-safe signal; the engine speed detecting circuit comprises an F/V converter for converting ignition pulses of the engine to voltage and a comparator to compare the voltage with a reference value to produce the engine speed signal, and the switching circuit comprises a transistor responsive to the engine speed signal and a resistor connected to the transistor in series.
- Assignee:
- Fuji Jukogyo Kabushiki Kaisha, Tokyo
- Patent Number(s):
- US 4621602
- OSTI ID:
- 7069085
- Resource Relation:
- Patent File Date: Filed date 10 Dec 1984
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
INTERNAL COMBUSTION ENGINES
CONTROL SYSTEMS
KNOCK CONTROL
VEHICLES
COMPARATOR CIRCUITS
ELECTRIC POTENTIAL
EXHAUST GASES
IGNITION SYSTEMS
MECHANICAL VIBRATIONS
PULSES
RESISTORS
SIGNALS
SPEED REGULATORS
SWITCHING CIRCUITS
THERMOMETERS
TIMING CIRCUITS
TRANSISTORS
CONTROL
CONTROL EQUIPMENT
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
ENGINES
EQUIPMENT
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
MEASURING INSTRUMENTS
SEMICONDUCTOR DEVICES
WASTES
330100* - Internal Combustion Engines