Long term firing and spark display
First Claim
1. In a system for analyzing the operation of a multiple cylinder internal combustion engine which provides an ignition voltage to each cylinder during each engine cycle, including sensing means for sensing the ignition voltage-for each cylinder as it fires, RPM measuring means for continuously computing engine speed during each engine cycle, and a display device with a screen having a predetermined plot area, the improvement comprising:
- voltage plotting means for graphically generating a first bar-histograph plotted along a first axis in the plot area for viewing an ignition voltage, corresponding to a selected point of a cylinder firing waveform, for one or more selected cylinders over a plurality of successive engine cycles, andRPM plotting means for graphically generating a second bar-histograph, plotted simultaneously with said bar-histograph along a second axis in the plot area, for viewing instantaneous engine speed information for said plurality of successive engine cycles.
1 Assignment
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Accused Products
Abstract
An engine analyzer for plotting engine cylinder firing or spark voltage information, corresponding to distinct points of a cylinder firing waveform, in histograph form to assist in identifying a cylinder-misfire condition. In an illustrative embodiment, two traces are provided. The lower trace depicts a histograph, representative of the firing or spark voltage and engine speed of each cylinder over successive engine cycles. The histograph consists of successive pairs of adjacent, vertical histo-bars, each pair representing voltage and engine speed for a single cylinder. The first histo-bar in each pair represents the spark or firing voltage for a given cylinder and the second histo-bar represents the instantaneous engine speed measured over the duration of the given cylinder. The vertical histo-bar pairs are plotted sequentially from left to right, representing successive cylinder firings. The vertical histo-bars may be of one or more colors so that the associated plot for a given cylinder of interest is easily identified. The histographs are available in both live and freeze mode. An upper trace displays primary or secondary waveforms for one or more selected cylinders.
38 Citations
12 Claims
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1. In a system for analyzing the operation of a multiple cylinder internal combustion engine which provides an ignition voltage to each cylinder during each engine cycle, including sensing means for sensing the ignition voltage-for each cylinder as it fires, RPM measuring means for continuously computing engine speed during each engine cycle, and a display device with a screen having a predetermined plot area, the improvement comprising:
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voltage plotting means for graphically generating a first bar-histograph plotted along a first axis in the plot area for viewing an ignition voltage, corresponding to a selected point of a cylinder firing waveform, for one or more selected cylinders over a plurality of successive engine cycles, and RPM plotting means for graphically generating a second bar-histograph, plotted simultaneously with said bar-histograph along a second axis in the plot area, for viewing instantaneous engine speed information for said plurality of successive engine cycles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification