Advance and retard timing light
First Claim
1. A timing control circuit for a strobe lamp for use in the adjustment of an internal combustion engine having a fixed reference mark and a moving reference mark with an engine adjustment reference point occurring when said reference marks are aligned, comprising:
- means for producing an increasing ramp voltage synchronized with the engine ignition timing;
means for producing a decreasing ramp voltage synchronized with the engine ignition timing;
means for producing a reference voltage including means for varying said reference voltage as a function of the desired amount of deviation of lamp flash from the occurrence of the engine adjustment reference point;
a comparator having first and second input terminals and providing an output pulse when a positive going voltage applied to said first terminal equals a reference voltage applied to said second terminal and when a negative going voltage applied to said second terminal equals a reference voltage applied to said first terminal;
first switch means for connecting said increasing ramp voltage and said reference voltage to said first and second terminals respectively of said comparator when in a first position and connecting said decreasing ramp voltage and said reference voltage to said second and first terminals respectively when in a second position whereby advance or retard deviation of lamp flash can be selected; and
means for connecting said comparator output to the strobe lamp as a trigger voltage.
3 Assignments
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Accused Products
Abstract
A timing control circuit for a strobe lamp for use in adjusting the timing of an internal combustion engine. A circuit which provides for retarding lamp triggering for setting ignition advance and for advancing lamp triggering for setting ignition retard. A circuit providing for advance and retard selection, the amount of advance or retard, and zero degree triggering for engines with various numbers of cylinders. A circuit with a ramp voltage synchronized with engine timing, a reference voltage for setting the amount of advance or retard, and a comparator which provides a triggering signal for the lamp when the ramp and reference voltages match.
11 Citations
15 Claims
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1. A timing control circuit for a strobe lamp for use in the adjustment of an internal combustion engine having a fixed reference mark and a moving reference mark with an engine adjustment reference point occurring when said reference marks are aligned, comprising:
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means for producing an increasing ramp voltage synchronized with the engine ignition timing; means for producing a decreasing ramp voltage synchronized with the engine ignition timing; means for producing a reference voltage including means for varying said reference voltage as a function of the desired amount of deviation of lamp flash from the occurrence of the engine adjustment reference point; a comparator having first and second input terminals and providing an output pulse when a positive going voltage applied to said first terminal equals a reference voltage applied to said second terminal and when a negative going voltage applied to said second terminal equals a reference voltage applied to said first terminal; first switch means for connecting said increasing ramp voltage and said reference voltage to said first and second terminals respectively of said comparator when in a first position and connecting said decreasing ramp voltage and said reference voltage to said second and first terminals respectively when in a second position whereby advance or retard deviation of lamp flash can be selected; and means for connecting said comparator output to the strobe lamp as a trigger voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of retarding and advancing the triggering of a strobe lamp with respect to an adjustment reference point of an engine, including the steps of:
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detecting the occurrence of engine ignition timing events; generating an increasing ramp voltage and a decreasing ramp voltage synchronized with the engine ignition timing; generating a reference voltage of a magnitude varying as a function of the desired strobe lamp triggering deviation from the adjustment reference point; selecting one of the increasing ramp and decreasing ramp voltages depending on whether the strobe lamp triggering is to be retarded or advanced; and triggering the strobe lamp when the selected voltage and the reference voltage are matched. - View Dependent Claims (13, 14, 15)
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Specification