Distributorless ignition system interface for engine diagnostic testers
First Claim
1. For use with a test engine analyzer to analyze a computer controlled automotive engine having an electronic control module which develops timing signals to a coil ignition module which fires the spark plugs of the engine, the timing signals carrying dwell information, an interface, comprising:
- input means for receiving timing signals from the electronic control module;
output means for transmitting timing signals to the coil ignition module;
cylinder clock modification circuitry for receiving said timing signals from said input means and for passing timing signals to said output means, said cylinder clock modification circuitry generating a modified timing signal in response to an inhibit command signal for transmission to said coil ignition module, said modified timing signal carrying dwell information of a dwell period insufficient to fire a spark plug; and
power balance command circuitry for receiving a cylinder inhibit command from said engine analyzer and responsively generating a said inhibit command signal, whereby a cylinder of the engine is inhibited from firing.
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Accused Products
Abstract
An ignition system interface for interposing an automotive combustion engine having a computer controlled ignition with an engine test analyzer. The interface receives timing signals from the ignition computer and generates modified timing based on command from the engine analyzer. Modified timing signals are transmitted to the coil ignition module which fires the spark plugs of the engine. The analyzer may command a shorting of the cylinder which causes the interface to modify the timing at the appropriate time for inhibiting a selected cylinder from firing. Secondary signals from the spark plugs are received by the interface and converted to a proper voltage waveform for recognition by the engine analyzer. The cylinder No. 1 is monitored by the interface and converted to a proper waveform for transmission to the analyzer.
39 Citations
19 Claims
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1. For use with a test engine analyzer to analyze a computer controlled automotive engine having an electronic control module which develops timing signals to a coil ignition module which fires the spark plugs of the engine, the timing signals carrying dwell information, an interface, comprising:
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input means for receiving timing signals from the electronic control module; output means for transmitting timing signals to the coil ignition module; cylinder clock modification circuitry for receiving said timing signals from said input means and for passing timing signals to said output means, said cylinder clock modification circuitry generating a modified timing signal in response to an inhibit command signal for transmission to said coil ignition module, said modified timing signal carrying dwell information of a dwell period insufficient to fire a spark plug; and power balance command circuitry for receiving a cylinder inhibit command from said engine analyzer and responsively generating a said inhibit command signal, whereby a cylinder of the engine is inhibited from firing. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification