Steering-Wheel Hand Controls With Driver-Adaptive Acceleration Mapping
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Solution Overview
Problem
In vehicle operation systems where an operation member for acceleration and deceleration is provided on a steering member, the maximum stroke of the operation member is typically smaller than that of a pedal-operated system, leading to more sensitive and difficult adjustments for drivers, and varying control characteristics based on driver-specific grip strength and dexterity.
Innovation Solution
A vehicle operation system that includes a steering member, an operation member for brake and/or accelerator operations on the steering member, a detection device to detect the operation amount, and a computer to calculate a control characteristic representing the relationship between the operation amount and target deceleration or acceleration, based on detection results when a predetermined condition, such as a vehicle stop state, is satisfied.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the operation member is provided on the steering member, then the driver can accelerate and decelerate the vehicle without pedal operation, but the maximum stroke of the operation member is smaller than that of a pedal, making adjustment more sensitive and difficult
Solution Approach 1:
The control characteristic is dynamically adjusted based on detected operation amounts. The system calculates control characteristics representing the relationship between operation amount and target deceleration/acceleration, adapting to different driver operation patterns and conditions rather than using a fixed characteristic
Solution Approach 2:
The system changes the control parameter (control characteristic) based on operation conditions. By detecting operation amounts under specific conditions (such as when stop state is maintained) and calculating appropriate control characteristics, the system adapts the relationship between operation amount and vehicle response to suit different situations and drivers
2Adaptability or versatility
If the control characteristic is fixed, then the system is simple to implement, but the control characteristic does not accommodate differences in driver grip strength and dexterity
Solution Approach 1:
The system performs self-adjustment by automatically detecting operation amounts and calculating appropriate control characteristics without requiring manual calibration or external intervention. The ECU autonomously adapts to different drivers based on their operation patterns
Solution Approach 2:
The system uses feedback from the detection device that detects operation amounts to continuously refine and calculate appropriate control characteristics. The detected operation data is fed back to the ECU which adjusts the control characteristic accordingly
Data Source
AI summary
A vehicle operation system, including: a steering member to be gripped by a hand of a driver of a vehicle for a steering operation; an operation member for at least one of a brake operation and an accelerator operation, the operation member being provided on the steering member so as to be operable by the driver's hand; a detection device configured to detect an operation amount of the operation member; and a computer configured to receive a detection result of the detection device; wherein the computer is configured to calculate a control characteristic that represents a relationship between the operation amount of the operation member and target deceleration or target acceleration, which is a control target value, based on the detection result of the detection device acquired in a situation in which a predetermined condition including a condition that a stop state of the vehicle is maintained is satisfied.