Ignition control method and apparatus of an engine
AssigneeHyundai Motor Company
InventorJin-Seo Park
Life of this patent
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Abstract
The invention discloses an apparatus and method that calculates parameters for ignition control with respect to a reference cylinder every 180° of crank angle and actuates a dwell-on period and the ignition of the ignition cylinder based on those parameters. A timer-monitored period between crank-position sensor pulse is minimized by setting a reference angle, and misfires are prevented by forcing the dwell-on period and the ignition of the ignition cylinder based on a number of crank-position sensor pulses corresponding to a pre-dwell-on period. Errors relating to missing pulses are also prevented.
Claims25
An ignition control method for an engine, comprising:
- calculating a dwell angle and an ignition angle of a reference cylinder based on an engine speed;
- calculating a first number of pulses and a first timer-monitored angle corresponding to a pre-Dwell-On period with regard to the reference cylinder, the pre-Dwell-On period being a period from occurrence of a first reference pulse to a Dwell-On timing with regard to the reference cylinder;
- comparing the first number of pulses with a reference number of pulses that correspond to 180° of crank angle;
- determining an ignition cylinder based on the comparison of the first number with the reference number;
- and
- actuating ignition of a spark plug of the ignition cylinder based on the first number of pulses, the first timer-monitored angle, and the ignition angle of the reference cylinder.
An ignition control apparatus of an engine having a spark plug for each cylinder, the apparatus comprising:
- a crank-position sensor for generating a pulse signal on rotation of a crankshaft except for one or more missing pulses;
- an engine speed detector for detecting engine speed;
- an ignition coil driven by an electric current for dwell-on and ignition-on activation, said ignition coil generating a voltage for ignition upon said ignition-on activation;
- an electronic control unit for controlling said dwell-on and Ignition On activation of the ignition coil based on the pulse signal and the engine speed, wherein the electric control unit executes a set of instructions comprising instructions for:
- calculating a dwell angle and an ignition angle of a reference cylinder based on an engine speed;
- calculating a first number of pulses and a first timer-monitored angle corresponding to a pre-dwell-on period for the reference cylinder, the pre-dwell-on period being a period from a first reference pulse to a dwell-on point for the reference cylinder, and the pulses coming from a crank position sensor;
- comparing the first number of pulses with a reference number of pulses that correspond to 180° of crank angle;
- determining an ignition cylinder based on the comparison of the first number with the reference number;
- and
- actuating ignition of a spark plug of the ignition cylinder based on the first number of pulses, the first timer-monitored angle, and the ignition angle of the reference cylinder.
An ignition control method for an engine, comprising:
- calculating a dwell angle and an ignition angle for a reference cylinder;
- calculating a first number of pulses and a first timer-monitored angle for the reference cylinder;
- comparing the first number of pulses with a reference number of pulses that correspond to 180° of crank angle;
- determining an ignition cylinder based on the comparison of the first number of pulses with the reference number;
- and
- actuating ignition of the ignition cylinder based on the first number of pulses, the first timer-monitored angle, and the ignition angle.
Dependencies are inferred from the claim text.