Hydraulic Brake Simulator Counterforce Feedback
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Solution Overview
Problem
Existing hydraulic braking systems lack effective means to notify drivers of wheel locking or the risk of wheel locking, which can lead to suboptimal braking behavior, especially in power braking modes where the standard brake feel is compromised.
Innovation Solution
A control device and method that provide tactile feedback to drivers through counterforces on the brake pedal, utilizing electronic control units to temporarily decouple or adjust shutoff valves, allowing for perceivable counterforces during electronic brake force distribution and antilocking functions without requiring hardware changes to conventional systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a power braking system is used to assist braking, then braking efficiency is improved, but the driver loses tactile feedback about wheel locking conditions
Solution Approach 1:
The patent implements a feedback mechanism by temporarily coupling the simulator to the brake actuating element during braking operations. This allows the driver to perceive counterforces that indicate wheel locking conditions, restoring tactile feedback that was lost in pure power braking systems while maintaining braking assistance.
Solution Approach 2:
The simulator acts as an intermediary between the power braking system and the driver. It translates hydraulic pressure changes into tactile feedback forces on the brake pedal, enabling the driver to sense wheel locking conditions without directly connecting the brake actuating element to the wheel brake cylinders.
2Power
If the brake actuating element is decoupled from wheel brake cylinders in power braking mode, then braking assistance is improved, but driver awareness of braking status is reduced
Solution Approach 1:
The system periodically couples and decouples the simulator to the brake actuating element based on braking phase. During normal braking, the simulator is decoupled to allow power assistance. During critical phases indicating wheel locking risk, the simulator is temporarily coupled to provide tactile feedback, creating a periodic interaction pattern.
3Reliability
If electronic brake force distribution and antilocking functions are executed, then wheel locking prevention is improved, but driver perception of system operation is reduced
Solution Approach 1:
The system uses feedback through the simulator coupling to inform the driver when electronic brake force distribution or antilocking functions are active. The counterforces generated during simulator coupling signal the driver that the system is actively managing brake pressure to prevent wheel locking.
Data Source
AI summary
A control device for a vehicle hydraulic braking system, including an electronic device for transferring brake fluid into at least one wheel brake cylinder without a force transmission connection to the brake actuating element, or that is hydraulically decoupleable from the brake actuating element, with a motorized brake pressure buildup device; ascertaining whether wheel locking of at least one wheel of the vehicle that is braked with the at least one wheel brake cylinder is present or at risk; temporarily effectuating, at least at times, a counterforce on the brake actuating element acting against the actuation of the brake actuating element by the driver when it is ascertained that wheel locking is present or at risk and/or when the electronic brake force distribution function and/or the antilocking function are/is executed. Also described is a hydraulic braking system for a vehicle, and a method for operating such a braking system.