Vehicle Automated Driving Control Device for Brake Thermal Management
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Solution Overview
Problem
Existing automated driving control systems face challenges in achieving both noise vibration (NV) reduction performance and safety during vehicle deceleration, particularly on long downhill roads, as they struggle to selectively use engine brakes and wheel brakes effectively without causing excessive heating of the wheel brake or deteriorating NV reduction performance.
Innovation Solution
A control device that acquires map information, creates an action plan, predicts the temperature of the mechanical braking mechanism, and selectively uses internal combustion engine braking and mechanical braking mechanisms based on the prediction to optimize their utilization proportions, thereby preventing excessive heating and improving NV reduction performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only wheel brake is used for deceleration, then safety is improved, but NV reduction performance deteriorates due to excessive heating
Solution Approach 1:
The braking system is segmented into multiple independent braking mechanisms (engine brake, wheel brake, and regenerative brake) that can be selectively activated. The control device divides the total braking force requirement among these segments based on real-time conditions, allowing the wheel brake to rest periodically and cool down while maintaining safety through coordinated use of other braking mechanisms.
Solution Approach 2:
The control device dynamically changes the utilization proportion parameter of each braking mechanism based on wheel brake temperature predictions. When temperature approaches critical levels, the system automatically reduces wheel brake utilization and increases engine brake or regenerative brake utilization, thereby preventing overheating while maintaining deceleration performance and NV reduction.
2Object-affected harmful factors
If engine brake and wheel brake are selectively used, then NV reduction performance is improved, but safety may be compromised without proper coordination
Solution Approach 1:
The control device implements a closed-loop feedback system that continuously monitors wheel brake temperature, predicts future temperature based on upcoming route conditions (acquired from map information), and adjusts the utilization proportion of each braking mechanism in real-time. This feedback mechanism ensures that NV reduction performance is maintained while safety is never compromised, as the system can dynamically shift to wheel brake when temperature is safe and to engine brake when cooling is needed.
Solution Approach 2:
The control device performs preliminary temperature prediction based on map information about the upcoming route before actually needing to decelerate. This allows the system to proactively plan braking strategy in advance, ensuring that wheel brake temperature remains within safe operating ranges while optimizing NV reduction performance throughout the journey.
3Ease of operation
If friction brake is successively used during traveling, then deceleration control is simplified, but fading occurs due to excessive temperature rise
Solution Approach 1:
The control device merges multiple braking mechanisms (engine brake, regenerative brake, and wheel brake) into a unified braking system that operates cooperatively. By combining these mechanisms, the system maintains simplified deceleration control for the driver while distributing the thermal load across multiple components, preventing brake fading through coordinated usage and allowing each mechanism to rest and cool when not in use.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively enhances NV reduction performance and safety during deceleration by accurately predicting and managing the temperature of the mechanical braking mechanism, allowing for maximum utilization of the brake mechanisms while preventing overheating and noise-related issues.
Implementation Method 1
deceleration using a power source braking mechanism that uses a braking force of a power source EG
Implementation Method 2
deceleration using a mechanical braking mechanism 94 that applies a mechanical braking force to rotation of wheels
Data Source
AI summary
A control device for a vehicle capable of operating in an automated driving mode for automatically controlling at least the accelerating/decelerating control of the steering control and the accelerating/decelerating control of a vehicle includes: a route information acquisition unit; and an automated driving control unit that decides an action plan on a basis of map information, the action plan includes a target vehicle speed sequence that defines a target vehicle speed at the respective predetermined points at least on a road along which the vehicle will travel next, and the automated driving control unit calculates requested braking force that is braking force for decelerating the vehicle to target vehicle speed when the target vehicle speed is achieved by deceleration, calculates a predicted temperature of a brake device when the requested braking force is achieved, and decides a utilization proportion of the brake device for the requested braking force.