Vehicle Control Device Speed Threshold Adjustment
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Solution Overview
Problem
Existing vehicle control systems struggle to maintain smooth travel on off-road or sloping surfaces, as they require complex and inappropriate accelerator and brake operations from drivers, leading to vehicle instability and mismatch between driver intention and vehicle acceleration/deceleration.
Innovation Solution
A vehicle control device with a target speed setting mechanism that adjusts brake threshold speeds based on vehicle speed and operation inputs, allowing for simpler control of vehicle speed by generating braking force when necessary and preventing unintended acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If idling inhibitory control is executed to reduce tolerable slip, then traction control is improved, but vehicle cannot smoothly travel on off road or sloping road without complex accelerator operation
Solution Approach 1:
The vehicle control device automatically executes off-road support control to manage vehicle speed without requiring continuous driver intervention. The system self-adjusts braking force based on detected vehicle speed deviations, enabling smooth off-road travel while maintaining traction control through automated speed regulation rather than manual accelerator manipulation.
Solution Approach 2:
The control device continuously monitors vehicle speed and compares it against a target speed threshold. When vehicle speed exceeds the threshold, the system generates braking force to reduce speed, creating a closed-loop feedback mechanism that automatically adapts to changing off-road conditions without requiring complex driver operations.
2Speed
If brake target threshold speed is set higher, then vehicle acceleration is improved, but vehicle may accelerate against driver intention after running over obstacle
Solution Approach 1:
The brake target threshold speed is dynamically adjusted based on current vehicle speed conditions. When vehicle speed suddenly increases (such as after running over an obstacle), the threshold is automatically lowered to prevent unintended acceleration. This dynamic adjustment allows the system to maintain higher speed targets during normal acceleration while adapting to prevent acceleration against driver intention in abnormal conditions.
Solution Approach 2:
The control device changes the brake target threshold speed parameter in response to detected vehicle speed deviations. When vehicle speed exceeds the threshold, the system adjusts the parameter to generate appropriate braking force, enabling the vehicle to respond adaptively to both driver acceleration requests and unexpected speed changes from obstacles or road conditions.
Data Source
AI summary
To enable control of vehicle speed according to the intentions of a driver by a simpler operation. When a vehicle body speed rapidly decreases and becomes lower than a brake target threshold speed, the brake target threshold speed is decreased in conformity with the vehicle body speed. This prevents the increase of the vehicle body speed toward the brake target threshold speed such that a vehicle accelerates regardless of a brake being in operation because the brake target threshold speed is set at a higher value than the vehicle body speed. Accordingly, the vehicle body speed decelerates by a simpler operation while being able to prevent the vehicle from accelerating against the intentions of a driver and being able to control the speed of the vehicle according to the intentions of the driver.