Accelerator Pedal Reaction Force Control for Smooth Drive Handover
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Solution Overview
Problem
When switching from automatic drive to manual drive, the accelerator pedal position is not fixed due to reaction forces, leading to unstable vehicle speed.
Innovation Solution
An accelerator device with a pedal lever, a power transmission mechanism driven by a motor as a reaction force adjuster, and a controller that sets a target operation amount and controls the reaction force to stabilize the pedal position according to vehicle speed, ensuring smooth switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the accelerator pedal position is adjusted during switching from automatic drive to manual drive, then the pedal position can be set appropriately, but the reaction force causes the pedal position to become unstable
Solution Approach 1:
The system performs preliminary adjustment of the accelerator pedal position using the actuator before manual drive engagement, setting the pedal to the target operation amount corresponding to the current vehicle speed. This preliminary positioning ensures that when the driver takes over, the pedal is already at the appropriate position for smooth continuation of driving.
Solution Approach 2:
The controller continuously monitors the actual pedal position and compares it with the target operation amount, adjusting the reaction force via the actuator in real-time to maintain the pedal within the target range. This feedback control stabilizes the pedal position despite reaction forces during the transition period.
2Stability of the object's composition
If the reaction force is increased to fix the pedal position, then the pedal position stability improves, but the operation becomes difficult for the driver
Solution Approach 1:
The reaction force is dynamically adjusted based on the driving mode and pedal position. During automatic drive, the actuator applies sufficient reaction force to maintain pedal stability. When switching to manual drive, the controller reduces the reaction force to an appropriate level, allowing the driver to operate the pedal easily while maintaining sufficient stability for smooth transition.
3Device complexity
If the pedal position is not stabilized during mode switching, then the system remains simple, but the vehicle speed becomes unstable
Solution Approach 1:
The existing actuator and controller are utilized for multiple functions: normal pedal return operation and additional function of pedal position stabilization during mode switching. The controller integrates the mode switching detection and coordinate with the actuator to provide reaction force control, stabilizing vehicle speed during transition without requiring a separate dedicated stabilization system.
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
The device stabilizes the pedal position and prevents sudden vehicle speed changes by adjusting the reaction force, allowing for smooth mode switching from automatic to manual drive.
Implementation Method 1
a power transmission mechanism (50) driven by a motor (40)
Data Source
AI summary
An accelerator device includes a pedal lever, a reaction force adjuster and a controller. The pedal lever operates according to a stepping operation. The reaction force adjuster is driven by an actuator, and is capable of adjusting a reaction force that is a force in a direction of pushing back the pedal lever. The controller includes a target operation amount setting unit and a drive control unit. The target operation amount setting unit sets a target operation amount, which is an operation amount of the pedal lever according to a vehicle speed. The drive control unit controls a drive of the actuator. The controller controls the reaction force according to the target operation amount so that the operation amount of the pedal lever is within a target range when switching from an automatic drive to a manual drive.