Driving Motor Regenerative Torque Control for Coasting Comfort
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Solution Overview
Problem
Existing vehicle control systems struggle to adjust vehicle deceleration during coasting in a way that does not discomfort the driver, as the deceleration degree varies with driving situations and relying solely on vehicle velocity can lead to uncomfortable experiences.
Innovation Solution
A vehicle control device with a motor controller and a driving mode determiner that distinguishes between first and second driving modes, adjusting regenerative torque based on these modes to ensure comfortable deceleration, with the second mode having a smaller regenerative torque when the vehicle stops accelerating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If regenerative torque is increased to improve energy recovery during coasting, then energy efficiency is improved, but driver comfort deteriorates due to excessive deceleration
Solution Approach 1:
The patent applies dynamics by making the regenerative torque adjustable based on driving mode. The system transitions from a static torque application to a dynamic one that adapts to different driving conditions. In the first driving mode, higher regenerative torque is applied for maximum energy recovery, while in the second driving mode, lower regenerative torque is applied to maintain driver comfort, thus resolving the contradiction between energy recovery and comfort.
Solution Approach 2:
The patent changes the parameter of regenerative torque magnitude based on the determined driving mode. By detecting whether the vehicle is in the first or second driving mode, the system adjusts the torque parameter accordingly - applying larger torque in the first mode for energy efficiency and smaller torque in the second mode for comfort, thereby resolving the contradiction.
2Device complexity
If a single regenerative torque value is used for all driving conditions, then control simplicity is maintained, but adaptability to different driving modes deteriorates
Solution Approach 1:
The patent segments the driving conditions into two distinct driving modes (first and second driving modes) based on vehicle behavior characteristics. This segmentation allows the system to apply different regenerative torque strategies for different modes, improving adaptability while maintaining relatively simple control logic through clear mode classification.
Solution Approach 2:
The system dynamically determines the driving mode based on real-time vehicle behavior (acceleration/deceleration patterns) and adjusts the regenerative torque accordingly. This dynamic adaptation enables the system to respond to different driving conditions without requiring complex manual intervention, balancing adaptability with control simplicity.
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 solution allows for suitable control of vehicle deceleration during coasting, enhancing drivability by reducing discomfort and adapting to different driving modes, particularly by making regenerative torque smaller in the second driving mode when the vehicle stops accelerating.
Implementation Method 1
a regenerative torque of the driving motor is controlled
Data Source
AI summary
A vehicle control device configured to control a driving motor coupled to a wheel of a vehicle includes a motor controller and a driving mode determiner. The motor controller is configured to control the driving motor so that the driving motor enters a regenerative state while the vehicle is coasting and stops accelerating. The driving mode determiner is configured to determine whether the vehicle is in a first or second driving mode. In the first driving mode, a driving operation strength is low and the vehicle behavior is slow and gentle. In the second driving mode, the driving operation strength is high and the vehicle behavior is quick and active. When the vehicle stops accelerating in the second driving mode, the motor controller is configured to make a regenerative torque of the driving motor smaller than when the vehicle stops accelerating in the first driving mode.