Multiple-spark ignition system for internal combustion engine
AssigneeDenso Corporation
InventorsJyunichi Wada, Toru Yoshinaga
Life of this patent
Estimating the term…
Abstract
An ignition system for an internal combustion engine includes an ignition coil, electric power supply circuit, a switching transistor, engine condition detecting element or unit that detects a signal relating to flow speed of air-fuel-mixture gas in the engine, and ignition control unit that controls the switching transistor to provide multiple ignition sparks in a predetermined ignition period. The ignition control unit controls the switching transistor to maintain each of the ignition sparks according to the signal relating to the flow speed of air-fuel-mixture gas in the engine to maintain sufficient spark energy for igniting the air-fuel mixture gas.
Claims12
An ignition system for an internal combustion engine having a spark plug connected to the secondary coil, the ignition system comprising:
- an ignition coil having a primary coil and a secondary coil;
- electric power supply means for supplying primary current to the primary coil at a prescribed voltage;
- switching means for switching on and off the primary current at controlled timings to discharge the electric energy from the secondary coil to the spark plug;
- engine condition detecting means for detecting a signal relating to flow speed of air-fuel-mixture gas in the engine;
- ignition control means for controlling the switching means to provide multiple ignition sparks in a predetermined ignition period at the spark plug;
- wherein the ignition control means controls the switching means to maintain each of the ignition sparks according to the signal relating to the flow speed of air-fuel-mixture gas in the engine.
An ignition system for an internal combustion engine having a spark plug connected to the secondary coil, the ignition system comprising:
- an ignition coil having a primary coil and a secondary coil;
- electric power supply means, for supplying primary current to the primary coil at a prescribed voltage;
- switching means for switching on and off the primary current at controlled timings to discharge the electric energy from the secondary coil to the spark plug;
- a secondary current detecting element for detecting secondary current;
- ignition control means for controlling the switching means to provide multiple ignition sparks in a predetermined period at the spark plug;
- wherein the ignition control means controls the switching means to maintain each of the ignition sparks until the amount of the secondary current detected by the secondary current detecting element becomes a prescribed amount.
An ignition system for an internal combustion engine comprising:
- an ignition coil having a primary coil and a secondary coil;
- a battery;
- an electric power supply circuit, connected to the battery, for supplying primary current to the primary coil at a voltage higher than a voltage of the battery;
- switching means for switching on and off the primary current at controlled timings to charge and discharge the ignition coil with electric energy;
- a spark plug connected to the secondary coil;
- a secondary current detecting element for detecting secondary current supplied from the secondary coil to the spark plug;
- ignition control means for controlling the switching means to provide multiple ignition sparks in a predetermined period at the spark plug, thereby igniting fuel gas;
- wherein the ignition control means controls the switching means to maintain each of the ignition sparks until the amount of the secondary current detected by the secondary current detecting element becomes a prescribed amount.
Dependencies are inferred from the claim text.