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| Number | Title | Issue Date |
| 7406883 | Compact device for measuring the speed and the direction of rotation of an object The invention concerns a device for measuring the speed and direction of rotation of an object (3) near to which it is placed. It comprises: a magnetic detection device (2) that delivers, in response to a rotation of ... | 08/05/2008 |
| 7081824 | Track monitoring equipment The alignment of railway tracks may be monitored using an accelerometer (36) mounted on a bogie (24) of a railway vehicle to detect lateral accelerations, and a displacement transducer (38) to monitor the lateral displacements of a wheelset (... | 07/25/2006 |
| 6823275 | Fault tolerant apparatus and method for determining a revolution rate of a gear An apparatus comprises an edge detector, a memory and a pulse-input engine. The edge detector is configured to receive an input signal and a counter signal. The edge detector is further configured to send a set of time values based on the input signal and the counte... | 11/23/2004 |
| 6711513 | Fault tolerant apparatus and method for determining a revolution rate of a gear A measurement system and method for determining a revolution rate of a rotating gear is described. Such a rotating gear can be, for example, a turbine or compressor. The described measurement system and method, for example, can perform highly accurate measurements a... | 03/23/2004 |
| 5704336 | Fuel system A fuel system for an internal combustion engine (10) includes a controller (14) which controls the operation of an engine fuel pump (13). Signals are supplied to the controller by a transducer (16) which is responsive to the passage of teeth formed on the... | 01/06/1998 |
| 5646340 | Analytical tachometers Method and apparatus for engine and rotary machine analysis provides a vibration sensor adapted to produce a plurality of superimposed waveforms corresponding to engine or machine operating parameters including rotational speed. The signals are transmitte... | 07/08/1997 |
| 5170365 | Propeller speed and phase sensor A speed and phase sensor counterrotates aircraft propellers. A toothed wheel is attached to each propeller, and the teeth trigger a sensor as they pass, producing a sequence of signals. From the sequence of signals, rotational speed of each propeller is c... | 12/08/1992 |
| 4959807 | Device for measuring the speed of a moving object A device for measuring the speed of a moving object has first and second impact detectors separated by a preselected known distance and disposed in the path of movement of the object. As the object strikes the first and second detectors, the detectors eac... | 09/25/1990 |
| 4602510 | Fluidic rotational speed sensor A device for measuring the rotational speed of a rotating object in which a tream of fluid from a back pressure sensor is directed at a chopper wheel attached to the rotating object. The output of the back pressure sensor varies as the chopper wheel rotate... | 07/29/1986 |
| 4452079 | Acoustic tachometer An acoustic tachometer for diesel engines includes a microphone which is responsive to the sounds generated by the engine combustion occurrences. The microphone signal is passed through a band-pass filter having a variable center frequency which is determ... | 06/05/1984 |
| 4328706 | Tachometer suitable for use in engine maintenance Pressure changes in the engine case of an automobile are sensed to compute and display the engine rpm irrespective of the types of engines. A pressure sensing element is mounted on the oil filler port in the engine cylinder head cover by means of a mounti... | 05/11/1982 |
| 4126045 | Remote speedometer-tachometer A remote speedometer-tachometer for the measurement of the rpm's of an engine and the speed of the craft containing the engine is provided, having first and second adjustable voltages which are related to the pitch of the engine with the sound moving towa... | 11/21/1978 |
| 4066961 | Speed sensing Diesel engine speed is sensed by a thermistor which is disposed within an air inlet of the engine manifold so that the resistance of the thermistor varies in accordance with the temperature of the air within the inlet and thus in accordance with the speed... | 01/03/1978 |
| 4024473 | Stroboscopic device An arrangement for use in indicating the speed of rotation of a body including a switch operated by elements which rotate according to the rotation of the body, a frequency generator which has an output signal at a frequency related to the desired speed o... | 05/17/1977 |
| 3994176 | Pneumatic apparatus for measuring rate of movement A pneumatic apparatus for measuring the rate of movement of one object with respect to another. A pneumatic signal functionally related to the displacement of the object whose rate is being measured is generated, differentiated and recorded. The apparatus... | 11/30/1976 |
