Accelerator Pedal Reaction Force Control via Actuator
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing accelerator pedal systems lack detailed control over reaction force increments when vehicle speed exceeds a predetermined limit, failing to provide effective warnings to drivers.
Innovation Solution
An accelerator pedal system that includes a pedal control unit receiving vehicle speed and switch signals, generating control signals to manage reaction force through an actuator and power delivery mechanism, offering three modes: constant force, vibration, and knocking, to warn drivers of excessive speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a plurality of elastic members are used to control reaction force in quantized increments, then the reaction force can be controlled at discrete levels, but the control detail and precision are insufficient
Solution Approach 1:
The patent replaces the mechanical elastic member system with an actuator (motor) that applies torque to a reaction force generation wheel. This substitution enables continuous and precise control of reaction force through electrical signals, achieving detailed control without the limitations of quantized mechanical increments from multiple elastic members.
2Measurement precision
If an actuator and power delivery unit are introduced to enable detailed reaction force control, then precise control is achieved, but the device complexity increases
Solution Approach 1:
The actuator serves multiple functions: it generates the reaction force, can create vibration through oscillatory motion, and can produce knocking through intermittent contact. The power delivery unit with its gear mechanism also provides both torque transmission and motion control. This multi-functionality reduces the need for separate components for each warning mode, thereby limiting the increase in overall system complexity.
Solution Approach 2:
The patent introduces a dynamic reaction force generation mechanism where the actuator can vary its output continuously. The reaction force generation wheel can rotate to different positions, and the contact between the wheel and accelerator pedal can be adjusted dynamically. This dynamic control enables precise reaction force management without requiring a fixed complex mechanical structure.
3Reliability
If multiple warning modes (constant force, vibration, knocking) are implemented, then driver warning effectiveness is improved, but the control system complexity increases
Solution Approach 1:
The vibration warning mode is implemented through periodic oscillatory motion of the reaction force generation wheel, creating continuous vibrations on the accelerator pedal. The knocking mode uses periodic intermittent contact between the wheel and pedal. These periodic actions are controlled through the actuator's motion control, enabling multiple warning modes through variations in the same basic mechanism rather than requiring entirely separate systems for each mode.
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 detailed control over reaction force increments, providing effective warnings to drivers through customizable modes, enhancing driver awareness of dangerous speed conditions.
Implementation Method 1
an actuator, such as a motor, for generating power on the basis of the control signal
Implementation Method 2
A typical accelerator pedal system applies a reaction force to an accelerator pedal by elastic force of an elastic member
Data Source
AI summary
An accelerator pedal system that controls a reaction force of an accelerator pedal in a case that a vehicle speed exceeds a predetermined speed includes: a vehicle speed sensor; an accelerator pedal connected to a rod having a predetermined shape; a switch that generates a signal corresponding to at least one predetermined speed limit and a selected mode among a plurality of predetermined modes; an engine management system that receives signals from the vehicle speed sensor and the switch; an accelerator pedal position sensor that detects an operating position of the accelerator pedal and generates a corresponding signal; a pedal control unit that receives a vehicle speed signal and a switch signal from the engine management system, and outputs a control signal when a vehicle speed exceeds the speed limit; and a reaction device that is disposed to an upper portion of the accelerator pedal, and that, in response to the control signal of the pedal control unit, generates a reaction force depending on the selected mode, and applies the generated reaction force to the accelerator pedal. By the accelerator pedal system of the present invention a driver can drive a car with more safety.