Vehicle Stop Control Device Incline Detection
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Solution Overview
Problem
Conventional vehicle stop control devices rely on liquid pressure sensors and acceleration sensors to determine road surface incline, leading to inadequate braking force adjustment and ineffective suppression of swing-back when these sensors are absent, resulting in potential vehicle movement and passenger discomfort.
Innovation Solution
A vehicle stop control device that adjusts braking force by setting a target deceleration and determining road surface incline based on the difference between vehicle body deceleration and target deceleration, using a control unit to apply braking force without the need for liquid pressure or acceleration sensors, employing integral, proportional, and differential calculations to ensure proper braking force application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If liquid pressure sensor or acceleration sensor is used to determine road surface incline, then braking force adjustment accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The system uses its own braking force application data and vehicle deceleration measurements to self-determine road surface incline, eliminating the need for external sensors. The control unit calculates actual deceleration from vehicle speed changes and compares it with target deceleration to infer road gradient, allowing the system to serve its own measurement needs without additional hardware.
Solution Approach 2:
The patent replaces mechanical sensor-based detection systems with a computational approach using vehicle dynamics data. Instead of using acceleration sensors or liquid pressure sensors to directly measure road incline, the system substitutes this with calculations based on vehicle deceleration, braking force application, and speed changes, converting a mechanical measurement problem into a computational one.
2Ease of manufacture
If brake actuator is miniaturized to reduce cost, then manufacturing cost decreases, but ability to control braking force on ascent roads deteriorates
Solution Approach 1:
The miniaturized brake actuator system determines road surface incline by analyzing its own operational data (braking force application, vehicle deceleration, speed changes) without requiring external sensors. This self-service capability allows cost-reduced actuators to maintain reliable braking control on ascent roads through intelligent calculation rather than hardware complexity.
Solution Approach 2:
The system changes the approach from hardware-based incline detection to parameter-based inference. By monitoring changes in vehicle deceleration parameters, braking force parameters, and speed parameters, the system derives road surface incline information that enables reliable braking control on ascent roads despite the actuator's miniaturized size and reduced hardware capabilities.
3Stability of the object's composition
If braking force is increased to prevent backward movement on ascent road, then vehicle stability improves, but swing-back suppression deteriorates
Solution Approach 1:
The control unit determines road surface incline in advance by analyzing the relationship between target deceleration and actual deceleration during braking. This preliminary determination of ascent road conditions allows the system to pre-adjust braking force distribution before the vehicle comes to a complete stop, ensuring both stability prevention and swing-back suppression without conflict.
Solution Approach 2:
The system dynamically adjusts braking force based on real-time determination of road surface incline. By continuously monitoring the relationship between target and actual deceleration, the control unit can adaptively change braking force application to match actual road conditions, providing just enough force to prevent backward movement on ascent roads while avoiding excessive force that would cause swing-back.
Data Source
AI summary
A vehicle stop control device is provided. The device is configured to perform a stop control for stopping a vehicle by adjusting a braking force for wheels and includes a target deceleration setting unit which sets a target deceleration as a target for stopping the vehicle so as to have a smaller value as a vehicle body velocity comes closer to zero, a deceleration obtaining unit which obtains a vehicle body deceleration of the vehicle, a control unit which performs the stop control of setting the braking force to have a smaller value as a subtraction value obtained by subtracting the target deceleration from the vehicle body deceleration is greater, and causing the set braking force to be applied to the wheels; and a determining unit which determines that a road surface is an ascent road when the braking force set by the control unit is zero.