Apparatus for measurement and display of relative compression by cylinder
First Claim
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1. An apparatus for measuring and displaying an indication of compression of an internal combustion engine by cylinder, said internal combustion engine including at least two cylinders, a primary coil and a starter motor operable by a starter current, one of said cylinders representing a reference cylinder, comprising, in combination:
- input means, coupled to said engine, for producing a CYL CLOCK signal indicative of the firing of said primary coil and a CYLINDER #1 signal, indicative of the firing of said reference cylinder;
engine kill means, coupled to said engine, for controllably prohibiting the starting of said engine during cranking;
sample means, coupled to said starter, for measuring said starter current and generating a MAGNITUDE signal indicative thereof;
processor means for receiving said CYL CLOCK signal and said CYLINDER #1 signal, for activating said engine kill means, for intermittently receiving said MAGNITUDE signal, and for responsively providing an OUTPUT signal related to said MAGNITUDE signal; and
display means, responsive to said OUTPUT signal, for displaying a first series of symbols identifying said cylinders by number and a second series of symbols indicating the respective comparison of said cylinders.
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Abstract
An engine tester for determining relative compression by cylinder is disclosed. The tester includes a processor which samples starter current in response to input signals based upon engine cylinder firings. The processor correlates the starter current data and the input signals to identify the current by cylinder.
14 Citations
16 Claims
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1. An apparatus for measuring and displaying an indication of compression of an internal combustion engine by cylinder, said internal combustion engine including at least two cylinders, a primary coil and a starter motor operable by a starter current, one of said cylinders representing a reference cylinder, comprising, in combination:
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input means, coupled to said engine, for producing a CYL CLOCK signal indicative of the firing of said primary coil and a CYLINDER #1 signal, indicative of the firing of said reference cylinder; engine kill means, coupled to said engine, for controllably prohibiting the starting of said engine during cranking; sample means, coupled to said starter, for measuring said starter current and generating a MAGNITUDE signal indicative thereof; processor means for receiving said CYL CLOCK signal and said CYLINDER #1 signal, for activating said engine kill means, for intermittently receiving said MAGNITUDE signal, and for responsively providing an OUTPUT signal related to said MAGNITUDE signal; and display means, responsive to said OUTPUT signal, for displaying a first series of symbols identifying said cylinders by number and a second series of symbols indicating the respective comparison of said cylinders. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. In a compression test apparatus of the type coupled to an engine wherein a starter current is monitored, said engine including a coil and a starter motor, an improved means for measuring said starter current comprising, in combination:
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input means, coupled to said engine, for providing an input signal representative of the firing of said coil, said input signal being a DELAYED DWELL signal related to the firing of said coil; and sample means, coupled to said starter and said input means, for measuring said starter current in timed relationship to said input signal, whereby said starter current is intermittently sampled in accordance with the firing of said coil. - View Dependent Claims (13, 14)
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15. In a compression test apparatus of the type coupled to an engine wherein a starter current is monitored, said engine including a coil and a starter motor, an improved means for measuring said starter current comprising, in combination:
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input means, coupled to said engine, for providing an input signal representative of the firing of said coil; sample means, coupled to said starter and said input means, for measuring said starter current in timed relationship to said input signal, whereby said starter current is intermittently sampled in accordance with the firing of said coil, said sample means providing a MAGNITUDE signal representative of said starter current, said sample means including an amps probe, coupled to said starter and providing an analog signal, and a converter, said converter producing said MAGNITUDE signal in response to said analog signal. - View Dependent Claims (16)
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Specification
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Current AssigneeSnap-On Tools Company LLC (Snap-On Incorporated)
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Original AssigneeSun Electronics Corp (Snap-On Incorporated)
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InventorsLynn, Michael F., Kreft, Keith A., Rossetti, Alan E.
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Primary Examiner(s)MYRACLE, JERRY
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Application NumberUS06/141,668Time in Patent Office634 DaysField of Search73/117.2, 73/116, 364/551US Class Current73/114.23CPC Class CodesG01L 23/085 by measuring fluctuations o...
