초록 ▼

A switch connected in series with the ignition coil is “on”and “off,”respectively, in the presence and absence of a pulse furnished by a pulse generator operating in synchronism with the crankshaft of the engine. If the pulse width of the pulses is too small for the current in the ignition coil to r

A switch connected in series with the ignition coil is “on”and “off,”respectively, in the presence and absence of a pulse furnished by a pulse generator operating in synchronism with the crankshaft of the engine. If the pulse width of the pulses is too small for the current in the ignition coil to reach the minimum value required for ignition, the closing time of the series switch is advanced, while if the pulse width is too long, causing excess heat dissipation in the coil, the closing time of the switch is retarded. To accomplish this, a first digital counter counts downwards for a predetermined time and upwards for a time period in which the current in the ignition coil exceeds a predetermined current. Upon interruption of the current in the coil, the then-present value in the first digital counter is transferred to a second digital counter. The second counter then counts down at a predetermined rate until a predetermined count is reached. At this time, the series switch is switched to the conductive state.

대표청구항 ▼

In an ignition system having spark creating means (14, 17), and controllable switch means (13) connected to said spark creating means for permitting and blocking current flow through said spark creating means when in a first and second state respectively, and means (10) for furnishing a sequence of

In an ignition system having spark creating means (14, 17), and controllable switch means (13) connected to said spark creating means for permitting and blocking current flow through said spark creating means when in a first and second state respectively, and means (10) for furnishing a sequence of first ignition signals, each for timing the furnishing of a spark, an ignition control system comprising, in accordance with this invention, means (12) for switching said controllable switch means to said second state under control of said first ignition signals; first storage means (21) for furnishing a first storage signal representative of a predetermined count; first storage signal changing means (28, 29, 18, 33) for changing said first storage signal in a first direction for a predetermined time period and in a second direction opposite to said first direction for a time period corresponding to the time the current in said spark creating means exceeds a predetermined threshold value, thereby creating a current-depending modified first storage signal; a second storage means (23); transfer means (25, 26) for transferring said current-dependent modified first storage signal to said second storage means under control of said first ignition signal, thereby creating a current-depending second storage signal; second storage signal changing means connected to said second storage means and continuously changing said second storage signal in a predetermined direction; and switch control means (24) connected to and controlled by said second storage means and further connected for switching said controllable switch means (13) back to said first state when said second storage signal reaches a predetermined threshold value.