Engine testing apparatus and methods

专利名称：Engine testing apparatus and methods发明人：Keith N. Hitchcock申请号：US06/541041申请日：19831012公开号：US04520660A公开日：19850604

摘要：An engine timing apparatus comprises an ultrasonic transducer 8 which directs apulsed ultrasonic beam into a cylinder and converts the reflected ultrasonic signals intoelectrical signals. A sample/hold circuit 67 samples this signal at a time after each pulsewhen signal reflected by a piston ring passing through the beam are expected. Amicrocomputer 65 detects changes in the level of the sampled signal caused by thepiston rings as the crankshaft rotates, and receives signals from a transducer 71indicating the crankshaft position to allow top dead center position to be found. Themicrocomputer receives signals from a microphone 51 directed at a fuel injectorindicative of the onset of ignition and calculates the timing angle of the engine. Theapparatus also calculates engine speed and detects piston slap.

申请人：FROUDE CONSINE LIMITED

代理机构：Leydig, Voit, Osann, Mayer and Holt, Ltd.

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