Autonomous Driving Brake Switching for Stable Deceleration Control
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Solution Overview
Problem
Existing vehicle control systems face challenges in performing stable and accurate braking control when using multiple braking devices, as errors can occur between required acceleration and actual driving amounts, leading to over-braking or under-braking during transitions between braking device usage modes.
Innovation Solution
A vehicle control apparatus that selectively uses a first brake (auxiliary braking device) and a second brake (main braking device) based on various conditions, including host vehicle speed, required acceleration, and other-vehicle acceleration, to adjust control amounts and prevent overheating or wear and tear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If multiple braking devices are used together, then braking control stability is improved, but errors occur between required acceleration and actual driving amounts during transitions
Solution Approach 1:
The patent applies dynamics by making the braking device selection adaptive rather than fixed. The controller dynamically determines whether to use the first or second braking device based on real-time driving conditions, including current speed, required deceleration, and road gradient. This dynamic adaptation prevents the transition errors that occur when switching between fixed braking modes, as the system continuously adjusts its braking strategy to match current operational requirements.
Solution Approach 2:
The patent changes the operational parameters of the braking system by introducing conditional logic that selects different braking devices based on multiple parameters simultaneously. The controller evaluates current speed, required deceleration, and road gradient to determine optimal braking device selection. This parameter-based approach ensures smooth transitions without over-braking or under-braking, as the system only switches braking devices when the evaluated parameters indicate a safe and effective transition point.
2Power
If the second brake (main braking device) is used continuously for strong braking force, then braking power is improved, but overheating and wear and tear occur
Solution Approach 1:
The patent segments the braking function into two distinct braking devices with different characteristics. The first braking device is designed for gentle braking scenarios, while the second braking device handles strong braking requirements. By dividing the braking workload between these two devices based on real-time conditions, the system prevents any single device from being overused, thereby reducing overheating and wear on the second brake while maintaining sufficient overall braking power.
Solution Approach 2:
The first braking device acts as an intermediary for low-intensity braking situations, preventing the second braking device from being engaged unnecessarily. This intermediary approach allows the system to handle mild braking requirements through the first device, reserving the second device for situations where its superior braking power is truly needed, thus extending the durability of the second brake while maintaining adequate braking capability across all conditions.
3Reliability
If braking device usage is switched between first brake and second brake, then component durability is improved, but over-braking or under-braking occurs during transitions
Solution Approach 1:
The patent applies preliminary action by evaluating all relevant parameters (current speed, required deceleration, road gradient) before initiating a braking device transition. The controller performs this evaluation in advance to determine whether switching between the first and second braking devices is appropriate, ensuring that transitions occur only when conditions support accurate and smooth braking control, thereby preventing over-braking or under-braking during switches.
Solution Approach 2:
The system employs feedback by continuously monitoring the actual braking performance and comparing it against the required deceleration. The controller uses this feedback to adjust braking device selection and control amounts in real-time, ensuring that transitions between devices maintain precise acceleration control. This closed-loop feedback mechanism prevents over-braking or under-braking during transitions by making real-time corrections based on actual system response.
Data Source
AI summary
A vehicle control apparatus may include at least a brake, at least a sensor, a memory, and a processor. The vehicle control apparatus may identify, based on the at least a sensor, braking information including at least one of host vehicle driving speed, host vehicle acceleration, required acceleration, other-vehicle acceleration, whether to use the first brake, or braking pressure by the second brake, or any combination thereof if a braking trigger signal for a host vehicle is identified, and may perform, by selectively using the first brake and the second brake, braking control for the host vehicle based on the braking information.