Autonomous Braking System for Post-Collision Kinetic Energy Reduction
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Solution Overview
Problem
Current vehicle collision mitigation systems are inadequate in addressing post-collision scenarios, particularly in reducing kinetic energy and mitigating human error or impairment following a collision.
Innovation Solution
An autonomous braking system that detects collisions and undesirable movements post-collision, initiating an autonomous braking process if the driver has not applied the brakes, utilizing a controller with a braking algorithm and detection units for collision and movement detection, which includes sensors for acceleration, yaw rate, and wheel speed to pre-load the brake system and override driver input if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an autonomous braking system is implemented to reduce kinetic energy post-collision, then the safety and stability of the vehicle is improved, but the device complexity increases
Solution Approach 1:
The brake system is pre-loaded before a collision occurs, so that when a collision is detected, the braking action can be initiated immediately without delay. This preliminary preparation of the braking system enables faster response time and more effective kinetic energy reduction post-collision
Solution Approach 2:
The system continuously monitors vehicle movements through detection units that measure acceleration, yaw rate, and wheel speed. This feedback mechanism allows the control unit to detect collisions and undesirable movements, and automatically initiate braking actions when safety criteria are met
2Reliability
If the system autonomously overrides driver input to initiate braking, then the mitigation of human error is improved, but the ease of operation deteriorates
Solution Approach 1:
The system is designed to counteract potential harmful actions (driver errors or impairment) by having pre-programmed braking algorithms that automatically activate when collision criteria are met, preventing the vehicle from continuing unsafe movements
Solution Approach 2:
The braking system serves itself by automatically detecting collisions and initiating braking actions without requiring driver intervention. The control unit monitors vehicle state and autonomously activates braking when safety criteria are satisfied, making the system self-regulating
3Measurement precision
If multiple sensors are used to detect collision and movement, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
Multiple detection units measuring different parameters (acceleration, yaw rate, wheel speed) are merged into a unified control system. The control unit integrates data from all sensors to comprehensively assess vehicle state and determine when braking should be activated
Solution Approach 2:
The detection units serve multiple functions: they monitor normal vehicle operation, detect collisions, identify undesirable movements post-collision, and provide feedback for autonomous braking control. This multi-functionality reduces the need for separate specialized sensors
Data Source
AI summary
A method of controlling a vehicle includes providing a vehicle having a brake system configured to operate according to a nominal mode in which applied braking pressure is based on a driver braking request, a first active braking mode in which applied braking pressure is based on maximum ABS braking pressure and decreased in response to a driver brake pedal release, and a second active braking mode in which applied braking pressure is based on maximum braking pressure. In response to a detected collision, the system is controlled according to the first active braking mode. In response to the first active braking mode being active and no driver braking request being anticipated, the system is controlled according to the second active braking mode. In response to the first or second active braking modes being active and a termination criterion being satisfied, the system is controlled according to the nominal mode.