Sensor arrangement to determine rotational speeds
AssigneesSynatel Instrumentation Limited, 4B Components Limited
InventorsRonald Ashby, Jonathan Norman Wheat
Life of this patent
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Abstract
A sensor arrangement and method for an inductively rotational sensor consisting of a remote clone coil connected to a processor. The clone coil is located between a proximity sensor including a sensor and a rotating target so that when in an input or interrogatory mode rotational speed of the targets on a rotatable body is detected by the clone coil as a base rotational speed. The processor and the clone coil in an injection or output mode presenting emulating pulses to the sensor to mask the normal sensor coil to target interaction so the sensor coil sees the emulating pulses as the indicator of rotational speed. The emulating pulses proportional to the base speed and adjustable to desired levels of variation from the base speed as a reference.
Claims47
A sensor arrangement for a target upon a rotatable body and an sensor coil interaction, the arrangement comprising a clone coil for location in use between the target and the sensor coil whereby in use a first clone coil configuration in an interrogatory mode provides base pulses to a processor at a base rate indicative of a base speed of a rotatable body in use having a target and in a second clone coil configuration in an injection mode provides emulating pulses in use to an sensor coil at a rate proportionate to the base speed.
A sensor arrangement for a target upon a rotatable body and an sensor coil interaction, the arrangement comprising a clone coil for location in use between the target and the sensor coil, the clone coil configured to provide:—
- a. In a first clone coil configuration provide a substantively open circuit be effective transparent to the target and the sensor coil interaction as the target rotates in use;
- b. In the first clone coil configuration to interact with the sensor coil whereby base pulses are induced periodically in the clone coil at a base rate proportional to the target motion relative to the sensor coil and the base pulses provided to a processor;
- and,
- c. In a second clone coil configuration provide a substantially closed circuit transmit emulating pulses stimulated by the processor to the sensor coil at a strength sufficient to mask the target and sensor coil interaction and the emulating pulses provided at a rate proportionate to the base rate.
A method of determining whether a sensor arrangement configured to provide a trigger signal at a proportion of a base speed of a rotatable body in use is operating correctly, the method including the following steps:—
- a. Locating a clone coil between a target and a sensor coil arranged to determine by electrical pulses in the sensor coil due to motion of the target the speed of a rotatable body;
- b. In an interrogatory mode arranging for the clone coil in a first clone coil configuration to generate base pulses in the clone coil at a base rate indicative of a base speed in use of the rotatable body due to electrical interaction of the target with the sensor coil;
- c. In an injection mode the clone coil in a second clone coil configuration is arranged to inject emulating pulses towards the sensor coil at a rate proportionate to the base speed to emulate expected pulses which would be generated in the sensor coil as the target rotates in use and at which the trigger signal should be provided by the sensor arrangement.
Dependencies are inferred from the claim text.