Regenerative Generator Control for Vehicle Speed Adjustment Modes
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Solution Overview
Problem
In vehicles equipped with regenerative generators, the selection of predetermined vehicle speed adjustment modes can lead to unintended deceleration and discomfort for drivers, as existing technologies do not adequately restrict regenerative power generation control during these modes.
Innovation Solution
A vehicle system that includes a regenerative generator connected to a power storage unit and an electronic control unit, which predicts and sets deceleration and stopping positions based on route information for regenerative power generation, and restricts regenerative power enlargement control when a predetermined vehicle speed adjustment mode is selected to prevent unintended deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If regenerative power generation control is enlarged based on route information, then the regeneration power amount charged into the power storage unit is increased, but unintended deceleration occurs when a predetermined vehicle speed adjustment mode is selected, causing driver discomfort
Solution Approach 1:
The control system dynamically adjusts the regenerative power generation strategy based on the detected vehicle speed adjustment mode. When the mode is detected, the system switches to a restricted control pattern that prevents unintended deceleration, while when the mode is not active, the system employs aggressive regeneration control to maximize energy recovery. This dynamic adaptation resolves the contradiction by making the control behavior context-dependent.
Solution Approach 2:
The system changes the control parameters of regenerative power generation based on the vehicle speed adjustment mode status. Specifically, it modifies the regeneration torque commands and power charging rates according to whether the predetermined mode is active, thereby optimizing both energy recovery and driver comfort under different operating conditions.
2Loss of energy
If automatic deceleration control is performed based on route information, then fuel efficiency is improved through regenerative braking, but the vehicle speed adjustment selected by the driver is canceled, causing discomfort
Solution Approach 1:
The control system continuously monitors the vehicle speed adjustment mode status as feedback and uses this information to adjust the regenerative power generation control strategy. When the driver-selected mode is detected, the system provides feedback to disable aggressive regeneration control, thereby preserving the driver's intended vehicle behavior while still allowing for energy recovery under normal conditions.
Solution Approach 2:
The system takes preliminary action to prevent the cancellation of driver-selected vehicle speed adjustment by detecting the mode status before aggressive deceleration control is applied. By anticipating the potential conflict and adjusting control parameters in advance, the system prevents unintended deceleration while maintaining fuel efficiency benefits when appropriate.
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
The system effectively suppresses driver discomfort by restricting regenerative power enlargement control during predetermined vehicle speed adjustment modes, ensuring the vehicle behaves as intended by the driver and improving fuel efficiency.
Implementation Method 1
a regenerative generator configured to implement regenerative power generation
Data Source
AI summary
A vehicle includes a power storage unit, a regenerative generator, and an electronic control unit. The regenerative generator is connected to the power storage unit and is configured to perform regenerative power generation. The electronic control unit is configured to perform regeneration amount enlargement control in which positions of stopping and deceleration of the vehicle by input of driver's operations are predicted or set based on route information, regenerative power generation by the regenerative generator is controlled, and a regeneration power amount charged into the power storage unit is enlarged. The electronic control unit is configured to restrict the regeneration amount enlargement control when executing a predetermined vehicle speed adjustment mode by comparison with when the predetermined vehicle speed adjustment mode is not selected, the vehicle running with automatic adjustment of vehicle speed in the predetermined vehicle speed adjustment mode selected by intentional input from the driver.