Vehicle Temperature Control Limit Value Estimation
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Solution Overview
Problem
In vehicles, especially heavy-duty ones like trucks, the temperature control system depletes the energy storage source's state of charge during rest periods, risking damage or inability to start the driveline due to low battery charge when heating or cooling the passenger compartment without engine power.
Innovation Solution
A method to determine a limit value for interior temperature input based on temperature control time period, ambient environment parameters, and energy storage source state of charge, ensuring the battery remains within a safe charge range by predicting ambient temperature, air pressure, and weather profiles to optimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the temperature control arrangement is operated to maintain comfortable interior temperature during rest periods, then passenger comfort is improved, but the state of charge of the energy storage source decreases to an undesirably low level
Solution Approach 1:
The system performs preliminary actions by determining a limit value for interior temperature input before the rest period begins, based on the current state of charge and predicted ambient conditions. This preliminary calculation prevents excessive energy consumption during the rest period by setting appropriate temperature boundaries in advance.
Solution Approach 2:
The limit value for interior temperature input is made dynamic rather than fixed. It changes based on the state of charge of the energy storage source and predicted ambient conditions. When state of charge is low or ambient temperature is extreme, the limit value adjusts to reduce temperature control demands, thereby conserving energy while still providing acceptable comfort.
2Duration of action of stationary object
If the temperature control arrangement operates for extended periods during rest periods, then interior temperature comfort is maintained, but the energy storage source may be damaged or become insufficient for starting the driveline
Solution Approach 1:
The system calculates the limit value for interior temperature input in advance, considering the duration of the rest period and the initial state of charge. This preliminary determination ensures that the temperature control arrangement operates within energy boundaries that protect the energy storage source from damage and ensure sufficient charge remains for driveline starting.
Solution Approach 2:
The system uses feedback from the state of charge of the energy storage source and predicted ambient conditions to continuously adjust the limit value for interior temperature input. This feedback mechanism ensures that temperature control operations do not deplete the energy storage source below safe levels, thereby maintaining reliability throughout the rest period and for subsequent driveline starting.
3Use of energy by moving object
If the limit value for interior temperature input is set conservatively to preserve energy, then state of charge is maintained, but passenger comfort may be compromised
Solution Approach 1:
The limit value for interior temperature input is dynamically adjusted based on ambient conditions and state of charge. When ambient temperature is moderate and state of charge is high, the limit value allows for greater temperature control flexibility, improving comfort. When ambient temperature is extreme or state of charge is low, the limit value becomes more conservative to preserve energy, balancing comfort with energy conservation.
Solution Approach 2:
The system changes the parameter of interior temperature input limit based on varying conditions. By adjusting this parameter according to ambient temperature predictions and state of charge levels, the system optimizes the balance between energy consumption and passenger comfort throughout the rest period.
Data Source
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AI summary
The invention relates to a method for estimating a limit value (TLV) for an interior temperature input of a passenger compartment (12) of a vehicle (10). The vehicle (10) comprises an energy storage source (30) and a temperature control arrangement (14) adapted to control the interior temperature of the passenger compartment (12) of the vehicle (10) on the basis of the interior temperature input. The temperature control arrangement (14) is adapted to be powered by the energy storage source (30) during at least one operating condition of the vehicle (10). The method comprises: - determining a temperature control time period (Δt) during which the temperature control arrangement (14) is intended to be powered by the energy storage source (30); - determining an ambient environment parameter (EP) indicative of the environment ambient of the vehicle (10) during the temperature control time period (Δt); - determining a state of charge (SOC) of the energy storage source (30) on or before a starting time of the temperature control time period (Δt) and - determining the limit value (TLV) as the interior temperature input that can be used throughout the temperature control time period (At) on the basis of at least the temperature control time period (At), the ambient environment parameter (EP) and the state of charge (SOC).