Vehicle Speed Limiter Pedal Feedback Control
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Solution Overview
Problem
Existing vehicle speed limiter systems do not effectively alert drivers to significant accelerator pedal input when switching to a higher speed limit, potentially leading to unexpected acceleration and increased collision risk with preceding vehicles.
Innovation Solution
A vehicle speed limiter system that includes a detection unit for speed limits, a setting unit to set speed limits, a limiter unit to enforce speed limits, an obtainment unit to measure accelerator pedal input, a calculation unit to calculate a parameter based on this input, and a display unit to show this information when a new speed limit is detected, allowing the driver to adjust their pedal input before the speed limit increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the speed limit value is increased by switching to a newly detected speed limit, then the vehicle speed limit is improved (higher allowed speed), but the risk of unexpected acceleration and collision increases due to driver inattention to accelerator pedal input
Solution Approach 1:
The system provides visual feedback by displaying the accelerator pedal operation amount on the display unit. This feedback mechanism makes the driver conscious of their pedal input when speed limit increases occur, allowing them to adjust their operation appropriately and prevent unexpected acceleration or collisions.
Solution Approach 2:
The system performs preliminary action by displaying information about accelerator pedal operation amount before the speed limit switch takes effect. This advance warning allows the driver to adjust their pedal input in advance, preventing safety issues before they occur.
2Reliability
If the system displays information about accelerator pedal input before speed limit switching, then traveling safety is improved, but device complexity increases due to additional detection and display components
Solution Approach 1:
The accelerator pedal operation detection unit serves multiple functions: it detects pedal input for normal vehicle control and also provides data for the display unit to warn drivers during speed limit switches. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
3Loss of information
If the system continuously monitors and displays accelerator pedal operation, then driver awareness is improved, but information processing load and energy consumption increase
Solution Approach 1:
The system does not continuously display accelerator pedal operation information, but rather activates the display periodically or event-driven when speed limit switches are detected. This periodic action reduces unnecessary information processing and energy consumption while still providing critical warnings when needed.
Data Source
AI summary
A vehicle speed limiter system installed on a vehicle includes a detection unit to detect a speed limit value of a road while the vehicle is traveling; a setting unit to set the speed limit value; a limiter unit to limit the vehicle speed, based on the speed limit value; an obtainment unit to obtain a stepping amount on an accelerator pedal; a calculation unit to calculate a parameter depending on the stepping amount in a state where the vehicle speed is being limited by the limiter unit; and a display unit to display information based on the parameter, in a case where a speed limit value newly detected by the detection unit is greater than the speed limit value previously set by the setting unit, before the setting unit sets the speed limit value newly detected.