Collision Brake Control Using Wheel Speed Selection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle collision control systems lack effective calculation of vehicle speed during collisions, leading to insufficient safety measures in automatic brake control.
Innovation Solution
A vehicle control device that includes a speed calculator to determine vehicle speed at the time of collision using wheel speed sensors and a driving assist controller to perform automatic brake control, preventing wheel locking and secondary collisions by calculating speed based on the highest wheel speed when the brake pedal is depressed, and using the second lowest speed when it is not.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic brake control is applied using conventional speed calculation methods, then brake control is performed, but wheel locking occurs and secondary collisions cannot be prevented
Solution Approach 1:
The patent changes the parameter selection method for speed calculation by using the highest wheel speed value among multiple wheels during collision braking, rather than conventional average or individual wheel speed measurement. This parameter change prevents wheel locking by ensuring brake force is calibrated to the fastest rotating wheel, preventing any single wheel from decelerating too rapidly and locking up.
Solution Approach 2:
The system performs preliminary detection of wheel speeds from multiple wheels before finalizing the brake control action. By预先 detecting and comparing wheel speeds from multiple sensors, the system determines the appropriate brake force level in advance, preventing wheel locking before it occurs during the actual braking event.
2Measurement precision
If vehicle speed is calculated without considering brake pedal depression status, then calculation is simplified, but accuracy deteriorates on slippery roads
Solution Approach 1:
The patent implements dynamic speed calculation logic that adapts based on brake pedal depression status. When the brake pedal is depressed during collision, the system dynamically selects the highest wheel speed as the vehicle speed. This dynamic adaptation improves measurement precision without requiring complex additional hardware, as the selection logic automatically adjusts to the driving condition.
3Reliability
If conventional brake control is used without speed calculation, then control response is fast, but safety is insufficient
Solution Approach 1:
The system continuously monitors and preliminarily processes wheel speed data from multiple wheels before collision occurs. This preliminary action ensures that when collision detection triggers brake control, the speed calculation can immediately use pre-processed data, minimizing calculation time while ensuring accurate safety-critical speed measurement for proper brake force application.
Data Source
AI summary
The present invention provides a vehicle control device that enhances safety in an event of a collision of a vehicle. The vehicle control device includes: a speed calculator that calculates a vehicle speed at a time of collision when the collision of the vehicle is detected by the collision detection sensor, and a driving assist controller that performs automatic brake control based on the vehicle speed at the time of collision calculated by the speed calculator, wherein when a brake pedal is depressed at the time of collision of the vehicle, the speed calculator calculates the vehicle speed at the time of collision based on a highest of respective detected values by the wheel speed sensors for a plurality of wheels.