Brake Pressure Determination Using Vehicle Deceleration
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Solution Overview
Problem
Conventional vehicle braking systems are inefficient and costly due to the use of multiple pressure sensors and imprecise estimation methods for determining when driver-requested brake pressure exceeds the predefined pressure set by control electronics, particularly in electronically controlled systems like ACC.
Innovation Solution
A method and system that calculates the brake pressure predefined by control electronics using available measured variables, such as vehicle deceleration and wheel speed, eliminating the need for additional sensors and incorporating a learning process to refine calculations, thereby ensuring precise determination of brake pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two pressure sensors are used to measure brake pressure, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical sensor-based measurement system with a calculation-based system. Instead of using two pressure sensors to directly measure brake pressure, the system calculates the brake pressure predefined by control electronics based on measured vehicle deceleration and a characteristic variable K. This substitution eliminates the need for additional sensors while maintaining measurement precision.
Solution Approach 2:
The patent introduces vehicle deceleration as an intermediary parameter. Rather than directly measuring brake pressure with sensors, the system measures vehicle deceleration and uses it as a mediator to calculate the brake pressure. This intermediary approach allows indirect determination of pressure without requiring direct pressure sensing in both lines.
2Device complexity
If brake pressure is estimated based on ABS valve activation times, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent changes the parameters used for brake pressure determination from time-based (ABS valve activation times) to physics-based parameters (vehicle deceleration and characteristic variable K). By using deceleration, which can be measured with existing sensors, and calculating pressure through the characteristic variable K, the system achieves higher precision without increasing device complexity.
3Ease of manufacture
If conventional estimation methods are used, then cost is reduced, but reliability deteriorates for ACC systems
Solution Approach 1:
The patent replaces imprecise estimation methods with a calculation system based on vehicle deceleration and characteristic variable K. This substitution maintains cost-effectiveness by using existing sensors while significantly improving reliability for ACC systems through more accurate brake pressure determination.
Data Source
AI summary
A method and system for determining a brake pressure which is predefined by a vehicle control system involve effecting a vehicle braking process initiated by an electronic braking system and/or the vehicle driver, determining a vehicle deceleration a, and a brake pressure pestim, comparing the brake pressure pestim against a reference pressure pB, terminating the braking process triggered by the electronic braking system when pestim is less than the reference pressure pB, or continuing the braking process triggered by the electronic braking system when pestim is greater than or equal to the reference pressure pB.