Regenerative Brake Control With Motor Vibration ABS Feedback
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Solution Overview
Problem
In vehicles using regenerative braking force from a motor, it is difficult for drivers to recognize when an antilock brake system is activated due to high response, high convergence, and quietness of the motor.
Innovation Solution
A vehicle control device that includes a braking force controlling portion, an acquisition portion, and a derivation portion, which controls the motor's torque to generate a regenerative braking force and acquires and derives deceleration speeds to execute antilock control by adjusting the motor's vibration based on the difference between expected and actual deceleration speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If regenerative braking force from a motor is used, then braking efficiency and energy recovery are improved, but driver awareness of antilock control activation deteriorates
Solution Approach 1:
The patent applies mechanical vibration to the motor during antilock control execution. The control device causes the motor to vibrate at a frequency that can be perceived by the driver, providing tactile feedback that indicates antilock control is active. This resolves the contradiction by maintaining the efficient regenerative braking while adding a vibration-based notification mechanism that restores driver awareness of the control state.
2Speed
If motor response and convergence are increased, then braking performance is improved, but notification of antilock control to driver deteriorates
Solution Approach 1:
The patent implements periodic action by oscillating the motor torque during antilock control execution. The control device applies periodic torque variations to the motor, creating a vibrating sensation that notifies the driver of antilock control activation. This periodic torque modulation maintains the high response characteristics while simultaneously providing detectable feedback to the driver about the control state.
3Object-affected harmful factors
If motor quietness is improved, then ride comfort is enhanced, but driver recognition of antilock control deteriorates
Solution Approach 1:
The patent uses mechanical vibration as a notification mechanism that operates independently of acoustic noise. By causing the motor to vibrate mechanically during antilock control, the system provides driver feedback through tactile sensation rather than acoustic emission. This resolves the contradiction by maintaining motor quietness for ride comfort while using vibration-based feedback to ensure driver recognition of control activation.
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
Enables drivers to recognize the activation of the antilock brake system through controlled motor vibrations, improving driver awareness and reducing unease during braking.
Implementation Method 1
a motor configured to apply a regenerative braking force to a wheel
Implementation Method 2
the braking force controlling portion controls vibration of the motor based on a difference between the expected deceleration speed and the deceleration speed
Data Source
AI summary
In a vehicle control device provided in a vehicle including a motor configured to apply a regenerative braking force to a wheel, a braking force controlling portion controls torque of the motor such that the motor generates a regenerative braking force corresponding to a requested braking force requested to the vehicle. When the wheel locks during braking, the braking force controlling portion executes an antilock control in which the torque of the motor is controlled such that the lock of the wheel is restrained. An acquisition portion acquires the deceleration speed of the vehicle. A derivation portion derives an expected deceleration speed for the vehicle based on the requested braking force. In a case where the braking force controlling portion executes the antilock control, the braking force controlling portion controls vibration of the motor based on the difference between the expected deceleration speed and the deceleration speed.