Injection and ignition system tester
First Claim
1. An apparatus for in-vehicle testing of electronic fuel injection systems and electronic ignition systems;
- said apparatus selectively receiving voltage, resistance and pulse width;
said apparatus processing received information and selectively displaying at least voltage, resistance and pulse width information thereby derived;
said apparatus being entirely contained in a single, hand-held enclosure,said apparatus further comprising, in combination in a single, hand-held enclosure;
a volt meter means;
an ohmmeter means;
a logic power supply;
a voltage pulse train generator which simulates and substitutes for predetermined pulse trains supplied to electronic ignition modules,said voltage pulse generator producing pulses whose width and repetition rate is user adjustable;
a user selectable in steps variable voltage source having variable impedance which acts as a substitute for in-vehicle exhaust oxygen sensors, engine coolant temperature sensors;
a voltage pulse width timer adapted to time voltage pulse width of said predetermined pulse trains supplied to vehicle engine fuel injectors;
alphanumeric display means for displaying parameters including ohms, volts and time measured by said apparatus;
and bar graph display means for displaying in bar graph form timing information, said timing information including information derived from said voltage pulse width timer.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus for in-vehicle testing of electronic fuel injection systems and/or electronic ignition systems. The apparatus selectively is able to sense, at least voltage, resistance and pulse width, and is capable of processing the sensed information, selectively displaying the voltage, resistance and pulse width information on a front face of a hand-held enclosure which contains the apparatus. The apparatus also includes sensors for oxygen sensing, temperature sensing and the like, and a pulse injector. The apparatus is specifically for use in diagnosing faults in and/or maintaining vehicle injection and ignition systems in a work shop or roadside breakdown situation.
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Citations
10 Claims
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1. An apparatus for in-vehicle testing of electronic fuel injection systems and electronic ignition systems;
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said apparatus selectively receiving voltage, resistance and pulse width; said apparatus processing received information and selectively displaying at least voltage, resistance and pulse width information thereby derived; said apparatus being entirely contained in a single, hand-held enclosure, said apparatus further comprising, in combination in a single, hand-held enclosure; a volt meter means; an ohmmeter means; a logic power supply; a voltage pulse train generator which simulates and substitutes for predetermined pulse trains supplied to electronic ignition modules, said voltage pulse generator producing pulses whose width and repetition rate is user adjustable; a user selectable in steps variable voltage source having variable impedance which acts as a substitute for in-vehicle exhaust oxygen sensors, engine coolant temperature sensors; a voltage pulse width timer adapted to time voltage pulse width of said predetermined pulse trains supplied to vehicle engine fuel injectors; alphanumeric display means for displaying parameters including ohms, volts and time measured by said apparatus; and bar graph display means for displaying in bar graph form timing information, said timing information including information derived from said voltage pulse width timer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification