Vehicle Heat Engine Stop Control via Battery Temperature
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Solution Overview
Problem
Existing vehicle Stop & Start systems fail to consider the battery's recharging capacity when determining conditions for automatic engine stopping, leading to inefficient energy management, especially in cold conditions where battery recharging is limited.
Innovation Solution
The method controls automatic engine stopping based on the battery's load acceptance characteristics, including temperature and charge state, ensuring that the battery's state of charge is maintained above a minimum threshold and that sufficient energy is recovered between stopping phases to allow for safe restarts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the automatic stopping of the engine is controlled only by the state of charge threshold, then the control logic is simple, but the battery recharging capacity is not considered leading to inefficient energy management
Solution Approach 1:
The control system monitors multiple parameters including battery temperature, state of charge, and charge acceptance capacity. The system dynamically adjusts stopping authorization based on these parameters, particularly considering that charge acceptance varies with temperature and charge level, thereby optimizing energy management without excessive complexity
Solution Approach 2:
The system continuously monitors battery parameters and uses feedback from temperature and charge acceptance measurements to dynamically adjust stopping authorization. This feedback mechanism ensures that stopping decisions are based on real-time battery capacity to accept charge, improving energy management efficiency
2Use of energy by moving object
If engine stopping is authorized during cold conditions, then fuel efficiency is improved, but the battery cannot be recharged effectively leading to insufficient energy for restart
Solution Approach 1:
The system recognizes that battery charge acceptance is strongly dependent on temperature and adjusts stopping authorization accordingly. When battery temperature is below a threshold (e.g., 0°C), stopping is restricted or prohibited because charge acceptance is insufficient at low temperatures, ensuring restart reliability while still allowing stops during warmer conditions for fuel efficiency
Solution Approach 2:
The system prevents engine stopping during cold conditions before the problem of insufficient recharging can occur. By proactively restricting stops when temperature indicates low charge acceptance, the system avoids the adverse effect of being unable to recharge the battery sufficiently for the next restart
3Use of energy by moving object
If multiple parameters are monitored for stopping authorization, then energy management is optimized, but the device complexity increases
Solution Approach 1:
The battery management system performs multiple functions using the same monitoring infrastructure: it tracks state of charge, temperature, and charge acceptance capacity all through the same sensor network and control logic. This multi-functionality approach optimizes energy management without proportionally increasing system complexity
Solution Approach 2:
The system combines monitoring of temperature, state of charge, and charge acceptance into a unified control decision for engine stopping authorization. By merging these parameter monitoring functions into a single integrated control logic, the system achieves optimized energy management while minimizing the increase in device complexity
Data Source
Figure 1~2
AI summary
The method involves controlling automatic stop of a heat engine based on a charge acceptance characteristic parameter i.e. temperature, of an electric energy source e.g. battery, of an automatic stop and start device. Automatic stop of the engine is not authorized when the temperature of the source is less than a preset threshold that is approximately 0 degree Celsius. A request for automatically stopping the engine is accepted if the charge of the source is greater than a preset charge state threshold (min).