Boots – shoes – and leggings
Patent
1988-12-27
1990-11-20
Lall, Parshotam S.
Boots, shoes, and leggings
364566, 364556, 324169, 324178, 340672, 73505, 73488, G01P 348, G06F 1520
Patent
active
049723324
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates generally to an apparatus for determining the speed, angular position and direction of rotation of a rotatable shaft and more particularly to a camshaft of an internal combustion engine.
2. Background Art
In the field of internal combustion engine controls, it is a well recognized principal that accurate fuel injection timing is necessary to maintain stable and efficient engine operation. The timing of an internal combustion engine is highly dependent upon both the speed of rotation and the angular position of the engine at any instant in time. It is therefore necessary to determined both the crankshaft angle and rotational speed to a high degree of accuracy. Preferably, a single sensing element could be used for detecting both parameters. For example, U.S. Pat. No. 4,356,447 issued to Honig et al. on Oct. 26, 1982 discloses a single inductive type sensor and awn associated specially constructed disk for sensing both timing angle and speed of rotation. The disk includes a group of markers uniformly distributed about the periphery of the disk and an additional reference marker, distinguishable from the remaining markers and associated with a particular angle of rotation. Thus, by introducing some electronic complexity, Honig et al. determine rotational speed from the first group of markers while ignoring the presence of the reference marker. Additional circuitry utilizes the reference marker as an indication of angular position with the subsequent regularly recurring markers being used to subdivide the angular rotation. The use of the reference marker at a location aperiodic with the angular locations of the regularly recurring markers unnecessarily complicates the scheme for determining speed and angle of rotation.
Moreover, in internal combustion engines of the compression ignition type, it is possible for an external load to drive the engine in the opposite rotational direction. Operation of the engine in such a manner will lead to serious mechanical damage and resultant engine failure. It is desirable that a single system be capable of sensing not only rotational speed and angular displacement but also direction of rotation. By combining all three functions into a single system with a single Hall effect type speed sensor, an increase in system reliability can be expected due to the elimination of additional speed sensors and the high reliability of the rotating mechanical disk. Additionally, cost savings can be expected owing to the reduced number of sensors.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF THE INVENTION
In accordance with one aspect of the present invention, an apparatus determines the speed, angular position and direction of rotation of the rotatable shaft. The apparatus includes a disk element rotatable in synchronization with the rotatable shaft and having a plurality of contiguous circumferential zones of equal circumferential distance. Each of the zones has a first area positioned at a first preselected radial distance from the center of the disk and a second area positioned at a second preselected radial distance from the center of the disk different from the first radial distance. A first portion of the contiguous circumferential zones has first areas of equivalent circumferential distance. A second portion of the contiguous circumferential zones has first areas of equivalent circumferential distance different from the first portion, first area circumferential distance. A fixed sensor is disposed at a preselected radial distance from the center of the disk in sensing relation to the circumferential zones wherein the sensor is adapted for delivering a series of signals responsive to the passing of the circumferential zones. Means receives the signals and calculates the angular velocity of the disk responsive to the frequency of the signals, calculates the angular position of the disk in response to receiving the signal representative of a selected one of t
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Brandt Wayne D.
Luebbering Bernard L.
Caterpillar Inc.
Lall Parshotam S.
Mattson Brian M.
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