Saab-scania Aktiebolag

Mecel Ab

Saab Automobile Aktiebolag

Saab-scania Ab

Saab-scania Aktiebolog

Saab Automobile Aktienbolag

Hans Johansson

Jan G Nytomt

Per S Gillbrand

Bernt Andersson

Hans Danielsson

Hakan Andersen

Per Johansson

Method for ignition timing control in combustion engines

Method and system for an adaptive fuel control in two-stroke engines

Operation of servo devices for driving a motor vehicle - control,

Heat sink for an electric circuit board

The invention relates to a method and arrangement for cleaning the spark plugs of an internal combustion engine automatically subsequent to the engine stopping and then, preferably, after an unsuccessful attempt to start the engine. Consequently, conditions for a successful starting attempt are made more favorable. Conditions preventing the start of an engine are often due to the presence of deposits on one of the spark plugs, these deposits preventing an ignition spark from being produced in the cylinder. The inventive method and arrangement solve this problem by burning clean the spark plugs immediately after the engine has stopped, and then preferably after the engine has failed to start. A detection means establishes whether or not the engine has started by sensing a suitable engine parameter, preferably engine speed, through a speed indicator. When the detection means detects that the engine has stopped or has failed to start, a signal is sent to the control unit, which subsequently causes the ignition system to generate a shower of sparks in close succession on all spark plugs, either in parallel or in one cylinder at a time. The spark showers burn-off any deposits on the spark-plugs.

Method and arrangement for improving the starting ability of an internal

The invention relates to a method for achieving elevated charging of an ignition capacitor in a capacitive type ignition system for internal combustion engines. When starting a cold engine or when starting the engine under other conditions in which the battery capacity is low, activation of the engine starting motor will result in a drop in voltage in the electric system serving both the starting motor and the ignition system. The voltage drop in the electrical system will vary sinusoidally synchronously with the crankshaft rotation, owing to the fact that the starting motor will momentarily subject the electrical system to higher loads when the pistons are located adjacent their top-dead-center position L in the compression stroke. The method solves this problem, by delaying the re-charging of the capacitor until a position is reached in which the voltage drop in the electrical system has its lowest value.

Method for achieving an elevated charge of an ignition capacitor in a

The invention relates to a method and an arrangement for improving the starting ability of an internal combustion engine during difficult engine starting conditions that result from cold weather or other external circumstances. Lower than normal engine starting speeds can occur during cold weather, for example. So as not to hinder an engine start, it is essential that the spark plugs be free from deposits and in their best condition. This is achieved by burning off any deposits present on spark plugs during an engine start attempt, when difficult engine starting conditions are detected. During an engine start attempt a comparison circuit ascertains whether or not one or more detected engine parameters have a lower value than in normal engine starting conditions. The comparison circuit sends a signal to the control unit controlling the ignition system, so that the control unit will initiate the generation of a plurality of sparks, instead of a single spark, at ignition time points. The resultant spark shower then burns off any deposits that are present.

Method and system for controlling the spark ignition of ignition

Apparatus for sensing the relative position between a fixed first machine component and an axially displaceable and pivotably mounted second machine component includes first and second bar-shaped magnets disposed at mutually right angles and rigidly connected to the second machine component, each of the magnets having a free pole; and a plurality of transducers rigidly connected to the first machine component and facing the free poles of the magnets for sensing the magnetic field of said magnets. At each long side of each of the first and second magnets an adjacent magnet disposed in parallel with the respective first or second magnet, each of these adjacent magnets having a free pole disposed in the vicinity of the free pole of the respective first or second magnet. The free poles of the first and the second magnets have a polarity reverse to that of the free poles of the adjacent magnets, and each magnet has opposite to its free pole a second pole directed away from the transducers. At least the second poles of the mutually parallel magnets are magnetically connected. The location and the orientation of the magnets causes the extension of the magnetic field at the free poles of the first and second magnets to be restricted.

Arrangement in a magnetic position indicator

The invention relates to a method for detecting ion current in an ignition circuit included in the ignition system of an internal combustion engine, where a measuring voltage is applied to the ignition circuit and a measuring device is utilized for detecting ion current possibly present in the ignition circuit. In known solutions of this kind, it has been necessary to use comparatively expensive electronic components, usually not manufactured as standard, to protect the outside voltage source from high voltages occurring in the ignition circuit. The problems are aggravated when the prior art is applied to capacitive ignition systems. The present invention solves the problems involved in an advantageous manner and is essentially distinguished in that a constant measuring voltage is applied to the grounded connection of the ignition circuit between a secondary winding of the ignition circuit and a capacitor in the ground connection, and in that a possible ion current in the ignition circuit is detected in means, by a signal representing the ion current being taken off from the ground connection of the secondary winding.

Method and apparatus for detecting ion current in an internal combustion

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Amal, Sweden

Hans Johansson