Vehicle Brake Circuit Switching for Jerk-Free Low Deceleration
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Solution Overview
Problem
Existing vehicle deceleration systems struggle to provide fine gradation in braking pressure changes, leading to jerky deceleration, especially when deceleration requests are below a certain threshold, and fail to efficiently manage deceleration across multiple axles.
Innovation Solution
A method and braking system that activate only one brake circuit for either the front or rear axle below a predetermined deceleration threshold, using a central control unit to manage braking force via an ABS architecture and axle modulator, allowing for continuous and jerk-free deceleration by selectively activating the axle with the finest gradation in pressure change.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If both brake circuits for front and rear axles are activated simultaneously, then deceleration power is increased, but pressure change gradation becomes coarse causing jerky deceleration
Solution Approach 1:
The brake system is segmented into two independent brake circuits (front axle and rear axle), allowing selective activation. The control unit divides the deceleration task between axles based on requirements, enabling fine pressure control by activating only one circuit at a time when deceleration is below the threshold, thus avoiding the jerky deceleration caused by simultaneous activation while still achieving sufficient deceleration power.
2Ease of operation
If only one brake circuit is activated, then pressure change gradation is fine for smooth deceleration, but deceleration power is reduced
Solution Approach 1:
The system dynamically switches between single-circuit and dual-circuit activation modes based on the deceleration threshold. When deceleration demand is low (below threshold), only one brake circuit is activated for fine pressure control. When deceleration demand exceeds the threshold, the control unit activates both brake circuits to increase deceleration power, thus adapting the system's power output to the actual requirement while maintaining smooth operation when possible.
3Ease of operation
If brake pressure is continuously adjusted for smooth deceleration, then driving comfort is improved, but system complexity increases
Solution Approach 1:
The control system is segmented into a threshold-based decision logic that simplifies control complexity. Instead of continuously adjusting pressure with complex algorithms, the system uses a predetermined deceleration threshold to determine when to switch from single-circuit to dual-circuit activation. This segmented approach maintains driving comfort through fine pressure control in the single-circuit mode while avoiding excessive complexity in the control logic.
Data Source
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AI summary
The invention relates to a method for controlling the deceleration of a vehicle (200), in particular a utility vehicle (202), the vehicle comprising a central control unit (1), a first brake circuit (BK1) for a rear axle (HA) and a second brake circuit (BK2) for a front axle (VA). In said method, in the event of an electronically requested deceleration request below a predefined deceleration threshold value, only the brake circuit (BK1, BK2), for either the rear axle (HA) or the front axle (VA), that allows the finest graduation in the pressure change for substantially continuous, jerk-free manipulation of the deceleration is activated by the central control unit (1) and remains activated as long as the predefined deceleration threshold value is not exceeded by the deceleration request. The invention further relates to a braking system (206) and to a vehicle (200).