Auto Hold Control Using Road Slope and Brake Thresholds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current auto hold control systems in vehicles lack differentiation in driving scenarios, leading to inconvenient and potentially dangerous operations, such as vehicle sliding during uphill driving and frequent triggering during level or downhill driving, which reduces user experience and safety.
Innovation Solution
An auto hold control method and system that determines the driving scenario based on road slope, vehicle speed, and braking pressure to enable or disable the auto hold function, using specific thresholds for reversing, uphill, level road, and downhill driving scenarios, thereby tailoring the auto hold strategy to the current driving conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single determination condition is used to trigger the auto hold function, then the system is simple to operate, but the auto hold function cannot adapt to different driving scenarios, causing vehicle sliding during uphill driving or frequent triggering during level or downhill driving
Solution Approach 1:
The patent segments the driving scenarios into four distinct types (reversing, uphill driving, level road driving, and downhill driving) based on road slope and gear information. Each scenario has its own specific determination conditions for triggering the auto hold function, allowing the system to adapt to different driving conditions without requiring a single complex unified condition.
Solution Approach 2:
The patent applies different determination conditions (local qualities) to different driving scenarios. For example, uphill driving uses a lower braking pressure threshold compared to level road driving, while downhill driving uses a higher threshold. This localized adaptation ensures optimal performance for each specific scenario without compromising system simplicity.
2Reliability
If the auto hold function is triggered with a low enabling threshold to ensure safety during uphill driving, then vehicle sliding is prevented, but the function is frequently triggered during level road or downhill driving, reducing driving comfort
Solution Approach 1:
The patent dynamically adjusts the braking pressure threshold based on the detected driving scenario. The threshold is not fixed but changes according to the current scenario: lower for uphill driving to ensure safety, and higher for level road or downhill driving to prevent frequent unnecessary triggering. This dynamic adjustment maintains both reliability and driving comfort.
Solution Approach 2:
The patent changes the parameter (braking pressure threshold) according to the driving scenario. By modifying this key parameter based on scenario type, the system achieves both high reliability during critical uphill situations and high ease of operation during normal level or downhill driving, resolving the contradiction between safety and comfort.
3Reliability
If the auto hold function is frequently enabled during parking process to ensure safety, then collision risk is reduced, but the driver must frequently release parking by depressing accelerator pedal, making operations inconvenient
Solution Approach 1:
The patent segments the reversing scenario from other driving scenarios and applies a specific determination condition that requires both the brake pedal to be depressed and the vehicle to be stationary. This segmentation allows the system to provide safety during parking operations while avoiding frequent unnecessary triggering that would require frequent driver intervention to release.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An auto hold control method and system (10). The method comprises: acquiring a road slope, the vehicle speed, the braking pressure and gear information of a vehicle currently being driven; according to the acquired road slope and gear information, determining the driving scenario in which the vehicle is currently located; according to the determined driving scenario and the acquired vehicle speed and braking pressure, determining whether the vehicle meets an auto hold enabling condition, so as to obtain a determination result; and according to the determination result, enabling or disabling the auto hold function of the vehicle. By means of the auto hold control method and system (10), different auto hold strategies can be used according to different driving scenarios, such that the requirements of users in different driving scenarios (usage scenarios) are met, thereby improving the user experience and safety performance.