Belt Slip Detection Diagnostic Controller
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Solution Overview
Problem
Current systems fail to accurately distinguish between worn, wet, and broken belts in powertrain systems, leading to false diagnoses and increased warranty costs, as well as conveyor line shutdowns and revenue losses.
Innovation Solution
A diagnostic system that includes a controller to compare the speed of a motor to an engine, count slip events, and diagnose belt failures based on predetermined thresholds over drive cycles, distinguishing between different belt conditions by adjusting motor speed and tracking drive cycles and diagnostic attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a simple belt failure detection system is used, then the device complexity is reduced, but the measurement precision of belt condition is insufficient leading to false diagnoses
Solution Approach 1:
The diagnostic system segments belt condition assessment into multiple independent measurement dimensions: slip event detection, drive cycle analysis, execution rate calculation, and temporal pattern recognition. Each dimension independently evaluates specific aspects of belt health, allowing the system to achieve comprehensive diagnostic precision without requiring a single complex measurement mechanism.
Solution Approach 2:
The system dynamically adapts its diagnostic approach by continuously monitoring execution rates and adjusting detection thresholds based on operating conditions. The diagnostic criteria evolve over time through multiple drive cycles, allowing the system to distinguish between temporary anomalies and genuine belt failures, thereby improving measurement precision without static complexity.
2Reliability
If multiple diagnostic criteria are implemented, then the reliability of belt failure diagnosis is improved, but the loss of time for diagnosis increases
Solution Approach 1:
The system performs preliminary diagnostic assessments continuously during normal operation by monitoring slip events and execution rates. Diagnostic data is accumulated and pre-processed across multiple drive cycles before a failure determination is made, allowing the system to have reliable diagnostic criteria ready in advance rather than analyzing all parameters simultaneously when failure is detected.
Solution Approach 2:
The diagnostic system operates periodically through defined drive cycles, evaluating belt condition at specific intervals rather than continuously. This periodic assessment structure allows multiple diagnostic criteria to be applied systematically over time, improving reliability while managing the time required for comprehensive diagnosis through structured temporal sampling.
3Measurement precision
If execution rate monitoring is added to distinguish wet belts from worn belts, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The execution rate serves as an intermediary metric that translates complex multi-parameter diagnostic data into a single interpretable value. By calculating the ratio of diagnostic attempts to drive cycles, the system creates an intermediate measurement that indirectly reflects belt condition (wet vs. worn) without requiring direct physical sensors, thereby improving differentiation precision while avoiding additional hardware complexity.
Data Source
AI summary
A vehicle includes an engine, a motor, a belt, and a controller. The engine is configured to output torque via a crankshaft. The motor is configured to apply torque to and/or receive torque from the engine via an output shaft. The belt is operably disposed on the crankshaft of the engine and the output shaft of the motor. Rotation of the output shaft is transferred to the crankshaft via the belt. The controller is configured to identify a slip event by comparing a speed of the motor to a speed of the engine. The controller is further configured to count the number of slip events and diagnose a belt failure if the number of slip events exceeds a predetermined number of slip events over a predetermined number of drive cycles.