Dwell angle control for internal combustion engine ignition syst

Details Dwell angle control for internal combustion engine ignition syst Dwell angle control for internal combustion engine ignition syst

1980-12-05

1983-01-04

Lall, P. S.

Internal-combustion engines

High tension ignition system

Having dwell control

123416, 123650, 123644, F02P 504

Patent

active

043668003

ABSTRACT:
A dwell angle control has three counting devices for detecting acceleration. In a first UP/DOWN counter (17), the count in one direction takes place throughout the time the current in the primary circuit of an ignition coil (25) exceeds a current threshold value (I1). The count in the other direction is constant with respect to time. The counts on the first counter are taken over into a second UP/DOWN counter (11) in response to the input signal, the counting direction also being determined by the input signals. When the count in the second counter (11) 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. The adjustable trigger threshold value is advantageously determined by a third UP/DOWN counter (12) which is set to a fixed value (X) by an edge of the sensed signal and whose counting direction is also determined by the sensed signals. A very good dynamic response is achieved by the detection of acceleration by three counters during different time periods. It is advantageous to switch from a decrease in closure angle to an increase in closure angle at an adjustable speed by switching the adjustable trigger threshold value to a very small value and switching the counter (11) to a continuous DOWN count. This allows a matching to variable ON/OFF ratios of the sensed signal.

REFERENCES:
patent: 4018202 (1977-04-01), Gartner
patent: 4253443 (1981-03-01), Seeger et al.
patent: 4276860 (1981-07-01), Capurka

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