US 4,646,522 AGranted

Knock control system for supercharged engine

AssigneeMazda Motor Corporation

InventorsKiyotaka Mamiya, Tadashi Kaneko, Misao Fujimoto, Hirofumi Nishimura

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Abstract

A knock control system for a supercharged engine comprising a supercharger for providing a super charged air to the engine, an engine condition detector for detecting an engine operating condition, a knock detector for detecting the occurrence of engine knocking, an ignition timing determining unit, a supercharged pressure regulator, an ignition timing correcting unit, and a supercharged pressure correcting unit. The timing determining unit is operable to determine a principle ignition timing in response to an output from the condition detector, and the timing correcting unit is operable in response to an output from the knock detector to adjust the principle ignition timing in the event of occurrence of the knocking.

Claims12

Dependent claims

A knock control system for a supercharged internal combustion engine, comprising:

a supercharger for supercharging a suction air being supplied to the engine;
engine condition detecting means for detecting an operating condition of the engine;
knock detecting means for detecting the occurrence of knocking in the engine;
ignition timing determining means operable in response to an output signal from the engine condition detecting means for determining an ignition timing;
pressure regulating means for regulating to a target value the pressure of the suction air which has been supercharged;
ignition timing correcting means operable in response to an output signal from the knock detecting means for retarding the ignition timing upon the detection of occurrence of the knocking;
and
supercharged pressure correcting means for lowering the target supercharged pressure in dependence upon both a current retard angle at which said ignition timing correcting means is retarding the ignition timing and a preceding retard angle at which said ignition timing correcting means had previously retarded the ignition timing such that the greater that the current or the preceding retard angle is, the more the supercharged pressure correcting means lowers the target supercharged pressure.

5 more elements

A knock control system for a supercharged internal combustion engine , comprising:

a supercharger for supercharging a suction air being supplied to the engine;
engine condition detecting means for detecting an operating condition of the engine;
knock detecting means for detecting the occurrence of knocking in the engine;
ignition timing determining means operable in response to an output signal from the engine condition detecting means for determining an ignition timing;
pressure regulating means for regulating to a target value the pressure of the suction air which has been supercharged;
ignition timing correcting means operable in response to an output signal from the knock detecting means for retarding the ignition timing upon the detection of occurrence of the knocking;
and
target supercharged pressure determining means for adjusting the supercharged pressure of the suction air to a target value determined by a predetermined principle term, a first correction term dependent upon engine conditions including temperature of the suction air and temperature of an engine cooling water, and a second correction term dependent on both a current retard angle at which said ignition timing correcting means is retarding the ignition timing and a preceding retard angle at which said ignition timing correcting means had previously retarded the ignition timing such that the greater that the current or the preceding retard angle is, the more said second correction term lowers the target supercharged pressure.

5 more elements

Dependencies are inferred from the claim text.