Electric Motor Torque Control for Virtual Speed Bump Warning
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Solution Overview
Problem
Current methods for preventing overspeed in vehicles, such as speed bumps, speed limit information, and warning sounds, are inadequate as they often lead to frequent re-acceleration, discomfort, and potential misrecognition of speed restrictions, which can result in unsafe driving conditions.
Innovation Solution
A vehicle equipped with an electric motor that uses torque control to simulate the feeling of passing through virtual road surface facilities, such as speed bumps or road irregularities, to intuitively warn the driver of the need to decelerate by generating a pitching motion through controlled torque changes, thereby enhancing driver awareness without physical infrastructure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If speed bumps are used to prevent overspeed, then deceleration is induced, but frequent re-acceleration occurs and comfort deteriorates
Solution Approach 1:
The patent replaces physical road surface facilities (mechanical system) with an electric motor-based torque control system. The motor controller applies resistive torque to the drive wheels to simulate the deceleration effect of speed bumps, eliminating the need for physical infrastructure while maintaining overspeed prevention effectiveness without causing frequent re-acceleration or comfort deterioration.
Solution Approach 2:
The patent introduces a controller as an intermediary between the driver and the vehicle's drive system. The controller monitors vehicle speed and, when overspeed is detected, mediates the interaction by applying controlled resistive torque through the electric motor, creating a smooth deceleration effect that prevents overspeed while maintaining driver comfort and avoiding abrupt stops that would cause re-acceleration.
2Loss of information
If speed limit information and warning sounds are provided, then driver awareness is enhanced, but driver attention is insufficient and warnings are ignored
Solution Approach 1:
The patent uses the electric motor to generate controlled vibrations and pitching motions of the vehicle body when overspeed is detected. This physical sensation directly communicates the warning to the driver through the vehicle's movement, making the warning impossible to ignore unlike auditory or visual signals that can be overlooked or dismissed by an inattentive driver.
Solution Approach 2:
The patent implements a closed-loop feedback system where the controller continuously monitors vehicle speed and provides immediate tactile feedback through torque control when overspeed occurs. The resistive torque and resulting vehicle pitching motion serve as direct feedback to the driver, creating a cause-effect relationship that reinforces speed limit compliance more effectively than passive information display.
3Reliability
If vehicle speed is forcibly restricted, then overspeed is prevented, but driver maneuverability is reduced and emergency evasion becomes difficult
Solution Approach 1:
The patent employs dynamic torque control rather than static speed restriction. The motor controller continuously adjusts the resistive torque based on real-time speed measurements, allowing smooth and controlled deceleration that maintains vehicle stability. This dynamic approach preserves the driver's ability to maneuver during normal operation while providing effective speed control when needed, unlike fixed speed limiters that would compromise emergency evasion capability.
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 approach effectively transmits deceleration warnings to drivers, ensuring comfort during normal driving and alerting them to speeding conditions, potentially reducing accidents by promoting compliance with speed limits, while also reducing the need for physical road features and associated maintenance costs.
Implementation Method 1
implementing driving feeling passing through the set virtual road surface facility as a pitching motion of the vehicle using a torque control of the electric motor
Data Source
AI summary
A vehicle provided with an electric motor configured for outputting warning through torque control of the motor and a method of outputting warning for the same, may include: recognizing, by a controller, a stop point or a deceleration section where a pause or deceleration of the vehicle is required or recommended; setting, by the controller, a virtual road surface facility based on the stop point or a start point of the deceleration section; outputting, by the controller, information on a set position of the set virtual facility or a distance remaining from the vehicle to the set position; and implementing, by the controller, driving feeling passing through the set virtual road surface facility as a pitching motion of the vehicle using a torque control of the electric motor according to a vehicle speed when the electric vehicle passes the set position.