US 4,063,539 AGranted

System to control timing of cyclically repetitive events, particularly automotive ignition

AssigneeRobert Bosch GmbH

InventorsIngo Gorille, Wolfgang Borst, Winfried Klotzner, Karl Ott, Heinz Moller, Gunter Honig, Uwe Kiencke, Martin Zechnall, Ulrich Flaig, Alfred Schulz, Ernst-Olav Pagel

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Abstract

Operating parameters, such as speed and loading of the engine are converted in electrical signals which are converted into pulse rates, to control counting of an address counter, addressing a read-only (ROM) memory in which characteristics of the engine are stored. To provide easy introduction of additional parameters such as temperature, idle condition, maximum speed, start condition, etc., the final value of an accumulator counter, the number of which at a given time controls the ignition timing, can be changed; further, to simplify the system, the speed and load signals are processed during a portion of the time between successive ignition events, the remaining portion of the time being controlled solely by one of the parameters (preferably speed), thus simplifying the circuitry by providing a transfer switch connecting for the remaining period only the selected (preferably speed) signal to the accumulator counter, the count state of which controls the ignition instant.

Claims31

Dependent claims

System to control the timing of cyclically repetitive events, in dependence on operating parameters, such as ignition timing instant of ignition pulses in internal combustion engines in the light of operation of the engine, comprising

first sensing means (20) sensing an operating parameter and providing output signals representative thereof;
first counter means (55, 30) connected to and controlled by said sensing means (20) providing a first sequence of counted signals (f.sub.rn);
second sensing means (21) sensing a second operating parameter and providing output signals representative thereof;
second counter means (55, 47) connected to and controlled by said second sensing means (21) and providing a second sequence of counted signals (f.sub.rp);
an address counter (22) totalizing counted pulses;
a memory (23) addressed by the address counter and having stored therein at respective addresses characteristic values relating said first and second parameters, respectively, to the timing of said event;
a transfer switch (25) having input terminals (36, 37) and a transfer terminal (39);
the sensing means (20, 21), the memory (23), one input terminal (37) of the transfer switch (25), and the address counter (22) being serially connected;
a connection means between at least one of the counter means (55, 30;
55, 47) and the other input terminal (36) of the transfer switch, the transfer switch, through said connection means, shunting or bypassing the counted signals across at least the memory (23);
an accumulator counter (26, 155) totalizing counted signals and providing an output pulse triggering the ignition when a selected count number is reached;
and the accumulator counter (26) being connected to the transfer terminal (39) of the transfer switch (25).

9 more elements

System to control the timing of ignition pulses controlling the sparking of spark plugs in internal combustion engines, with respect to upper dead-center (UDC) position of respective pistons of the engine comprising

speed signal sensing means providing a speed output signal, and counter means (55, 30) providing sequentially counted pulses having a frequency representative of speed (f);
load signal sensing means (21) providing a load output signal, and counter means (47, 55) providing sequentially counted pulses having a frequency representative of loading on the engine;
an accumulator counter (26, 155) totalizing counted signals and providing an output pulse triggering the ignition when a selected count number is reached;
an address counter (22) connected to said counter means (55, 30;
55, 47) and providing an address in accordance with the count of the connected counter means;
a memory (23) addressed by the address counter (22) and storing characteristics of change in ignition angle with respect to at least one of:
speed;
load on the engine at selected addresses therein;
a transfer switch (25) having input terminals (36, 37) and a transfer terminal (39),
the sensing means (20, 21), the memory (23), one input terminal (37) of the transfer switch (25) and the address counter (22) being serially connected,
the transfer terminal (39) being connected to said accumulator counter (26, 155);
and connection means (35) between at least one of the counter means (30, 47) and the other input terminal (36) of the transfer switch (25) to shunt or bypass the counted signals across at least the memory (23) and apply the signals from one of said sensing means and the connected counter means directly to the accumulator counter (26, 155).

9 more elements

Dependencies are inferred from the claim text.