Ignition control system for internal combustion engines
AssigneeNippondenso Co., Ltd.
InventorHiroshi Yoshida
Life of this patent
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Abstract
An ignition control system wherein a computation circuit is provided between a timing pulse generator and an ignition device. The computation circuit receiving from the timing pulse generator timing pulses indicative of the ignition timing, controls duration in which the electric power is supplied to an ignition coil in the ignition device. The electric power supply is started prior to the timing pulse generation and terminated synchronized therewith to fire spark plugs in the ignition device.
Claims4
An ignition control system for internal combustion engines comprising:
- a battery;
- a timing pulse generator for generating timing pulses with the cycle time varying with engine operting conditions;
- a reference signal generator for generating a reference signal;
- a computation circuit, connected to said generator and said reference signal generator, for producing control pulses, by (1) subtracting a constant time period from said cycle time which is measured in response to said reference signal and (2) subtracting the remainder from said cycle time which is currently measured, thereby approximating the width of said control pulses to said constant time period,
- an ignition coil, connected to said battery and said computation circuit, for providing ignition energy in response to said control pulses from said computation circuit;
- and
- at least one spark plug, coupled to said ignition coil, for providing ignition sparks.
An ignition control system for internal combustion engines having at least one spark plug comprising;
- a battery;
- a timing pulse generator fo generating timing pulses in accordance with engine operating conditions;
- first means, connected to said timing pulse generator, for measuring the time period of said timing pulses in each cycle thereof;
- second means, connected to said first means, for memorizing the measured time period of said timing pulses;
- third means for providing a constant time period;
- fourth means, connected to said second means and said third means, for subtracting said constant time period from said measured time period;
- fifth means, connected to said first means and said fourth means, for comparing a subtraction-resultant time period with the time period in the following cycle of said timing pulses;
- and
- an ignition device, connected to said battery and said fifth means, for firing said spark plug in synchronism with said timing pulses, said ignition device being supplied with the eletric power from said battery only while the timer period of said timing pulses exceeds said subtraction-resultant time period.
Dependencies are inferred from the claim text.