Belt Temperature Monitoring to Prevent Starter Slipping
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Solution Overview
Problem
Existing methods for preventing slipping of belts connecting a starter member to an internal combustion engine, such as those in hybrid vehicles, are unreliable due to overestimation of slipping risks, especially when belts are frosted, leading to reduced engine availability.
Innovation Solution
A method that measures or estimates the belt temperature and prohibits engine stoppage or starting if the temperature falls below a calibrated threshold of 0°C, taking into account ambient conditions like humidity and water presence, to accurately assess the risk of icing and prevent slipping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the belt temperature is not monitored and only outside temperature is used to prevent slipping, then the system is simpler to implement, but the slipping risk assessment becomes unreliable and overestimates the risk
Solution Approach 1:
The patent introduces an intermediary element (temperature sensor or estimation module) that indirectly measures belt temperature through ambient temperature in the engine compartment, rather than directly measuring outside temperature. This intermediary approach improves measurement accuracy while avoiding the complexity of direct belt temperature sensing.
Solution Approach 2:
The patent replaces complex mechanical temperature measurement systems with electronic temperature sensing or software-based estimation methods. This substitution maintains high measurement precision while significantly reducing device complexity and cost.
2Reliability
If the engine stoppage is prohibited whenever outside temperature is below 0°C, then slipping prevention is simplified, but engine availability is reduced due to overestimation of slipping risk
Solution Approach 1:
The patent changes the critical parameter from outside temperature to actual belt temperature (or ambient temperature in engine compartment). This parameter change allows for more accurate slipping risk assessment, maintaining reliability while improving engine availability by avoiding unnecessary stoppage prohibitions.
Solution Approach 2:
The patent implements a dynamic assessment system that continuously monitors belt temperature and adjusts engine stoppage authorization in real-time, rather than using a static threshold based on outside temperature. This dynamic approach optimizes both reliability and engine availability.
3Reliability
If slip detection is implemented by comparing engine speed and alternator-starter speed, then slipping detection is achieved, but the system becomes expensive and the detection reliability remains limited
Solution Approach 1:
The patent replaces complex mechanical speed comparison systems with a simpler temperature-based detection method. By monitoring belt temperature and comparing it to a threshold, the system achieves reliable slip detection without the complexity and cost of dual speed sensing and comparison mechanisms.
Solution Approach 2:
The patent extracts the essential indicator of slipping risk (belt temperature) from the complex speed comparison system. By focusing on this single critical parameter, the system achieves reliable detection while eliminating unnecessary complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively prevents slipping by aligning the belt temperature assessment with real conditions, reducing overestimation of slipping risks and maintaining engine availability.
Implementation Method 1
The adhesion between the belt and the crankshaft and starter-alternator pulleys is then insufficient. Thus, under these conditions when the internal combustion engine performs an assisted start, the pulley of the alternator-starter shaft can slip on the belt
Data Source
Figure 1~2
AI summary
The invention relates to a method for preventing a belt (4) that connects a starter member (2) to an internal combustion engine (1) of a motor vehicle from slipping, the slipping being liable to occur as a result of a deposit of ice on the belt (4). The method comprises an estimate or measurement (10) of a temperature of the belt (4) at a given moment and, if the estimated or measured temperature of the belt (4) is below a calibratable temperature threshold at least lower than 0°C at this given moment, then, when the internal combustion engine (1) is turning over, a command not to stop the internal combustion engine (1) is issued or, when the internal combustion engine (1) is stopped, a command not to start the internal combustion engine (1) using the starter member (2) associated with the belt (4) is issued.