Passenger Vehicle Braking Profile With Conditioning Pulse
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional vehicle braking methods are ineffective in ensuring the safety of standing and unbelted passengers, as abrupt deceleration can cause passengers to fall due to inadequate preparation and unpredictable vehicle behavior during emergency braking situations.
Innovation Solution
A method involving a conditioning braking pulse followed by a controlled braking phase with multiple partial braking areas, where the actual deceleration increases degressively, allowing passengers to prepare and hold on, and the braking system uses friction brakes to avoid abrupt changes in deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an abrupt increase in deceleration is applied to trigger a haptic warning to the driver or to shorten braking distance, then the braking response efficiency is improved, but passenger safety deteriorates as passengers may fall due to the sudden deceleration
Solution Approach 1:
The braking process is segmented into multiple phases: a first phase with initial deceleration to prepare passengers, followed by a second phase with increased deceleration for effective collision avoidance. This segmentation allows the system to balance passenger safety with braking effectiveness by applying different deceleration levels at different times.
Solution Approach 2:
A preliminary braking phase is applied before the main emergency braking phase. This preliminary action causes an initial deceleration that prepares passengers for the upcoming stronger braking, reducing the harmful effect of sudden deceleration on passengers while maintaining the ability to brake effectively when needed.
2Reliability
If a constant emergency braking deceleration is applied to stop the vehicle quickly, then the collision avoidance capability is improved, but passenger comfort and safety worsen due to the abrupt and unpredictable nature of the braking
Solution Approach 1:
The braking system transitions from a static, constant deceleration approach to a dynamic, time-varying deceleration profile. The deceleration is continuously adjusted based on the vehicle's speed and the braking phase, creating a more predictable and controllable braking process that maintains collision avoidance capability while improving passenger safety.
Solution Approach 2:
The deceleration parameter is changed over time during the braking process. Instead of maintaining a constant emergency deceleration, the system varies the deceleration level - starting with a lower value to prepare passengers, then increasing to a higher value for effective collision avoidance, and finally reducing near the end of braking to prevent passenger injury from sudden stops.
Data Source
Figure 1
Figure 2
Figure 3a
AI summary
The invention relates to a method for braking a vehicle for carrying passengers, having at least the following steps: - checking whether a trigger criterion for braking the vehicle for carrying passengers is present; - if the trigger criterion is met, bringing about a conditioning braking pulse (BI) through brief pulsed braking of the vehicle such that the passengers in the vehicle experience brief braking of the vehicle, and immediately thereafter - initiating a braking phase (B), wherein the vehicle is braked in the braking phase (B) in at least two braking subregions (TBi), via a braking system, through a temporally changing actual ego deceleration (zIst1), wherein each braking subregion (TBi) extends over a braking subinterval (dti), wherein the braking subregions (TBi) transition into one another without the actual ego deceleration (zIst1) changing abruptly, and the actual ego deceleration (zIst1) is changed continuously in at least one of the braking subregions (TBi) over the respective braking subinterval (dti) such that a different actual jerk (jlsti) arises in each braking subregion (TBi), and wherein the actual jerk (jlsti) behaves in a degressive manner over at least some braking subregions (TBi) of the braking phase (B).