Pulser Plate Mass Balancing for Accurate Tooth Pulse Detection
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Solution Overview
Problem
The pulser plate in engine systems can become dynamically unbalanced due to indexing gaps and tooth characteristics, leading to vibrations and incorrect detection of tooth pulses by the crankshaft sensor, which affects engine timing.
Innovation Solution
Incorporating mass modifiers on the pulser plate, such as additional projections or teeth of varying mass, to achieve dynamic balance without altering the sensed behavior detectable by the crankshaft sensor, thereby maintaining engine timing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an indexing gap is introduced in the pulser plate to enable position detection, then the crankshaft sensor can detect tooth pulses and determine engine timing, but the pulser plate becomes dynamically unbalanced causing vibrations
Solution Approach 1:
Balance weights are added to the pulser plate at specific radial positions and angles to counteract the mass imbalance created by the indexing gap. The counterweights compensate for the missing mass in the gap region, restoring dynamic balance and reducing vibrations while preserving the gap's detection function.
Solution Approach 2:
The pulser plate is designed with non-uniform mass distribution through strategically placed balance weights and varying tooth masses. This local modification of mass properties allows the plate to maintain its functional asymmetry (indexing gap) while achieving overall dynamic balance through localized mass compensation.
2Stability of the object's composition
If mass modifiers are added to balance the pulser plate, then vibrations are reduced, but the sensed behavior of the pulser plate may be altered
Solution Approach 1:
Balance weights are positioned in specific angular locations and radial distances from the center, carefully selected to affect mass distribution without interfering with the sensor's detection zone. This localized mass modification achieves balance while preserving the optical or magnetic field interaction between the sensor and tooth pulses.
Solution Approach 2:
The balancing solution operates in the spatial dimension by adding mass modifiers at specific three-dimensional positions on the pulser plate. This allows independent control of mass distribution without altering the two-dimensional pattern of teeth that the sensor detects, separating the balancing function from the detection function.
Data Source
AI summary
Embodiments for balancing a pulser plate are provided. In one embodiment, a pulser plate includes a plurality of teeth, an indexing gap, and a mass modifier. The teeth of the plurality of teeth define a sensed behavior of the pulser plate. The indexing gap separates a first tooth and a second tooth of the plurality of the teeth. The indexing gap is symmetrical about a first axis on a face of the pulser plate. A second axis defines a proximate side of the pulser plate having the indexing gap and a distal side of the pulser plate. The first axis and the second axes are orthogonal to a pulser plate axis and intersect at a center. The mass modifier includes a first mass modifier on the proximate side of the pulser plate to balance the mass of the pulser plate about the center and does not change the sensed behavior.