Ignition timing control system for internal combustion engines
AssigneesToyota Jidosha Kogyo Kabushiki Kaisha, Nippon Soken, Inc.
InventorsHiroaki Yamaguchi, Tadashi Hattori, Minoru Nishida, Kenji Goto, Daisaku Sawada, Takashi Shigematu
Life of this patent
Estimating the term…
Abstract
An ignition timing control system is provided with an ignition timing computing unit which determines a maximum acceleration ignition advance .alpha. ACMAX in accordance with an intake pressure difference P and a water temperature T of the engine. When an acceleration is detected by a rapid movement of an acceleration pedal, the maximum acceleration ignition advance is added to the normal ignition advance. Thereafter, the maximum acceleration ignition advance is gradually reduced to zero in accordance with the lapse of time or a change in the engine speed.
Claims5
An ignition timing control system for an internal combustion engine comprising:
- first detecting means, responsive to an intake condition of said engine, for producing a first detection output indicative of the detected intake condition;
- second detecting means, responsive to the rotation of said engine, for producing a second detection output indicative of the detected rotational speed;
- third detecting means for producing a third detection output indicative of a rate of change in an operator induced demand for acceleration of said engine in excess of a predetermined rate of change in demand;
- fourth detecting means, responsive to the temperature of said engine, for producing a fourth detection output indicative of the detected temperature;
- fifth detecting means, responsive to an operating condition of said engine for producing a fifth detection output related to the acceleration of said engine between a first selected instant in time and a second selected instant in time;
- first setting means, responsive to said first and second detection outputs, for producing a first setting output indicative of the first ignition advance corresponding to the detected intake condition and rotational speed;
- second setting means for producing a second setting output in response to said third detection output, said second output being indicative of the second ignition advance which gradually changes from a reference value determined in dependence on said fourth and fifth detection outputs;
- correcting means responsive to said first and second setting outputs, for correcting said first setting output in accordance with said second setting output and producing an output indicative of the corrected ignition advance, said output being equal to said first setting output when said second setting output is absent;
- and
- igniting means responsive to said output of said correcting means and effective to produce an ignition spark at said corrected ignition advance.
Dependencies are inferred from the claim text.