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US 4,380,981 AGranted
Knocking control system for use with spark ignition internal combustion engine
AssigneeNissan Motor Co., Ltd.
InventorsToshio Enoshima, Shoji Furuhashi, Hideyuki Tamura
Life of this patent
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Abstract
A knocking control system includes a spark timing adjusting circuit which responds to the magnitude of knocking occurring in the engine to set an amount of retardation of the timing from a reference spark timing within a predetermined range. The spark timing adjusting circuit includes a range change circuit which responds to a drive signal produced from an engine operational state determining circuit, in order to change the predetermined range.
Claims14
A knocking control system for a spark ignition internal combustion engine, comprising:
- (a) a reference spark timing determining means for determining a reference spark timing for the engine according to the engine speed and load;
- (b) a knocking sensing means for sensing engine knocking to produce a knocking signal representing the presence of the knocking;
- (c) an engine operational state determining means for sensing one of engine speed and load to produce a drive signal when said one of engine speed and load is in a predetermined range;
- (d) a spark timing adjusting means responsive to the knocking signal for setting an amount of retardation of the timing from the reference spark timing and;
- (e) a range change means responsive to the drive signal for determining an allowable maximum amount of spark timing retardation from the reference spark timing such that outside a predetermined range of one of engine speed and load, the allowable maximum amount of spark timing decreases.
2 more elements
Dependencies are inferred from the claim text.