Apparatus for controlling ignition timing of engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsShinji Saito, Masaya Adachi, Norimasa Hattori
Life of this patent
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Abstract
An apparatus for controlling an ignition timing of an engine is capable of reducing or preventing occurrences of backfires. The apparatus includes a no-load deceleration state detector for detecting that an engine is in a no-load deceleration state. An engine speed detector detects an engine speed. An advanced timing setting unit sets an advanced ignition timing (retard amount) in situations where the occurrence of backfires are likely, such as during the no-load deceleration state. A converter 105 determines an ignition angle θig on the basis of an output pulse of a pulse generator and an advance amount provided by the advanced ignition timing setting unit.
Claims20
An apparatus for variably controlling an ignition timing of an engine in accordance with operating conditions of the engine, said apparatus comprising:
- a no-load deceleration state detector for detecting that an engine is in a no-load deceleration state;
- an engine speed detector for detecting an engine speed;
- and
- a controller advancing an ignition timing when said no-load deceleration state detector detects the no-load deceleration state and said engine speed detector detects the engine speed to be in a speed range.
An apparatus for variably controlling an ignition timing of an engine in accordance with operating conditions of the engine, said apparatus comprising:
- a standard ignition timing setting unit for providing standard ignition timing control signals during normal engine operating conditions;
- an advanced ignition timing setting unit for providing advanced ignition timing control signals during engine operating conditions prone to backfiring;
- a pulse generator sensing an angular position of a crankshaft, and outputting pulse signals;
- a converter for receiving the pulse signals from said pulse generator;
- a switch to selectively connect one of said standard ignition timing setting unit and said advanced ignition timing setting unit to said converter;
- and
- a no-load deceleration state determining unit controlling the operation of said switch, said no-load deceleration state determining unit causing said switch to connect said advanced ignition timing setting unit to said converter during engine operating conditions prone to backfiring and causing said switch to connect said standard ignition timing setting unit to said converter at other times, wherein the engine operating conditions prone to backfiring include a speed of the engine being within a predetermined speed range.
A method of controlling an ignition timing of an engine comprising the steps of:
- sensing if a throttle is fully closed;
- if the throttle is fully closed, determining an engine speed;
- if the engine speed is with a predetermined speed range, comparing a drop rate in the engine speed to a threshold value;
- and
- if the drop rate meets or exceeds the threshold value, advancing an ignition timing.
Dependencies are inferred from the claim text.