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« lessĪ device for determining the charge condition of a secondary electric storage battery includes a digital integrator comprising a pulse generator for producing pulses at a frequency proportional to the magnitude of the instantaneous battery current and an up-down counter for counting the pulses in a sense (i.e., up or down) dependent upon the battery current direction.
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This allows the counting process of the speed dependent counting value to be triggered and the electronic switch to be opened (Ignition time) by a single sensed signal edge per cycle. This triggering value is set by periodic up and more » down counting processes in a control counter the upwards counting being constant with respect to time and the count-down process being determined by the length of time of current flow above a settable current value through the ignition coil. Upon reaching a presettable triggering counting value, the electronic switch is closed (Start of dwell period). Specifically, speed dependent counting values are periodically generated in a counting apparatus each being counted down in a further counting apparatus controlled by an edge of the sensed signal or a computed signal. = ,Īn ingition system for internal combustion engines has dwell angle control apparatus for controlling the switching times of an electronic switch in the primary circuit of an ignition coil in dependence on the signals of a rotating sensor or an ignition computer. This allows a matching to variable on/off ratios of the sensed signal. It is advantageous to switch from a decrease in closure angle to an increase in closure angle at an more » adjustable speed by switching the adjustable trigger threshold value to a very small value and switching the counter to a continuous down count. A very good dynamic response is achieved by the detection of acceleration by three counters during different time periods. The adjustable trigger threshold value is advantageously determined by a third up/down counter which is set to a fixed value by an edge of the sensed signal and whose counting direction is also determined by the sensed signals. When the count in the second counter reaches an adjustable trigger threshold value, the closure time is initiated, the actual ignition time being fixed by an edge of a sensed signal, or the edge of the signal from an ignition computer.
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The counts on the first counter are taken over into a second up/down counter in response to the input signal, the counting direction also being determined by the input signals. The count in the other direction is constant with respect to time. In a first up/down counter, the count in one direction takes place throughout the time the current in the primary circuit of an ignition coil exceeds a current threshold value. A dwell angle control has three counting devices for detecting acceleration.