Hybrid Vehicle Towing Mode Control by Battery SOC Threshold
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Solution Overview
Problem
Conventional hybrid electric vehicles experience a significant reduction in towing capacity and drivability during towing mode due to the state of charge (SOC) of the power storage device decreasing, which limits motor output.
Innovation Solution
A hybrid electric vehicle system that includes a controller to permit or prohibit the towing mode based on the SOC of the power storage device, using threshold values to manage towing mode initiation and termination, and notify the user of mode changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the towing mode is continuously operated to ensure sufficient driving force, then the driving force is improved, but the state of charge of the power storage device decreases significantly, which limits motor output and reduces towing capacity
Solution Approach 1:
The controller checks the state of charge before permitting towing mode operation. By performing this check in advance (preliminary action), the system ensures that towing mode is only activated when sufficient charge is available, preventing the problem of charge depletion during towing operation.
Solution Approach 2:
The controller continuously monitors the state of charge during towing mode operation and provides feedback to the towing mode permission determination. When the state of charge falls to or below the threshold value, the controller terminates towing mode, creating a closed-loop feedback system that prevents charge depletion.
2Productivity
If the state of charge threshold is set low to allow more towing operation, then the towing capacity is improved, but the risk of power storage device depletion increases, which significantly limits motor output
Solution Approach 1:
The system dynamically adjusts the operating parameters by using a threshold value for state of charge that is set to or above 50%. This parameter setting ensures that towing mode is only permitted when sufficient charge is available, balancing towing capacity with power storage device reliability.
3Reliability
If the towing mode is prohibited when state of charge is low to protect the power storage device, then the power storage device is protected, but the towing capacity is significantly reduced
Solution Approach 1:
The controller checks the state of charge before permitting towing mode operation. By performing this check in advance (preliminary action), the system ensures that towing mode is only activated when sufficient charge is available, preventing the problem of charge depletion during towing operation.
Solution Approach 2:
The controller continuously monitors the state of charge during towing mode operation and provides feedback to the towing mode permission determination. When the state of charge falls to or below the threshold value, the controller terminates towing mode, creating a closed-loop feedback system that prevents charge depletion.
Data Source
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AI summary
A hybrid electric vehicle includes an engine for driving, a motor for driving, a power storage device that is configured to exchange power with the motor, and a controller that is programmed to control the engine and motor to travel with the engine running in towing mode. The controller is programmed to permit the towing mode when the towing mode is indicated and a state of charge of the power storage device is higher than a threshold value, and the controller is programmed to prohibit the towing mode when the towing mode is indicated and the state of charge is lower than or equal to the threshold value.