Determining engine cylinder contribution from indexed engine data
AssigneeSnap-on Incorporated
InventorsRobert D. DeCarlo, Michael B. Meeker, Dennis M. Mutzabaugh, Ronald M. J. Lammers, Nicolaas M. J. Stoffels
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Abstract
An engine diagnostic system is provided that enables a service technician to evaluate engine cylinder contribution to output power. The service technician couples one or more signal leads to the vehicle's battery, alternator, or accessory receptacle (e.g., cigarette lighter receptacle) to provide an alternator output signal to a signal analyzer. The signal analyzer processes the alternator output signal to generate an engine signature, which represents engine cylinder contribution to engine output power.
Claims33
A signal processing system for generating an engine signature from indexed engine data, the system comprising:
- a buffering unit configured to receive the indexed engine data;
- an engine data repair unit operatively coupled to the buffering unit and configured to generate reconstructed engine data;
- a synchronization unit operatively coupled to the engine data repair unit and configured to produce an engine cycles signal;
- and
- a filter operatively coupled to the synchronization unit and configured to filter the engine cycles signal to produce the engine signature.
A method for generating an engine signature from indexed engine data, the method comprising:
- receiving the indexed engine data;
- generating reconstructed engine data;
- producing an engine cycles signal;
- and
- filtering the engine cycles signal to produce the engine signature.
A signal processing system for generating an engine signature from indexed engine data, the system comprising:
- means for receiving the indexed engine data;
- means for generating reconstructed engine data;
- means for producing an engine cycles signal;
- and
- means for filtering the engine cycles signal to produce the engine signature.
Dependencies are inferred from the claim text.