Brake Pressure Generator Control for ABS Pressure Spike Mitigation
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Solution Overview
Problem
High mechanical loads on brake system components during ABS maneuvers due to delayed information transmission from ABS/ESP systems to electromechanical brake boosters or plunger systems, leading to excessive pressure oscillations and hardware damage.
Innovation Solution
Implementing a hydraulically closed brake system with a secondary control unit and brake pressure generator control unit that simulates control strategies based on wheel speeds to predict and manage brake pressure, reducing pressure spikes by slowing down pressure increase movements and compensating with volume changes, thus reducing hardware-damaging pressure spikes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the ABS/ESP system increases stiffness by switching valves and conveying volume back against the plunger, then the brake pressure control response is improved, but the mechanical load on the master cylinder and plunger system increases significantly
Solution Approach 1:
The control device predicts the resulting brake pressure by simulating the secondary control strategy in advance before the ABS/ESP intervention occurs. This preliminary prediction allows the system to prepare appropriate countermeasures, such as pre-positioning the plunger or adjusting pressure buildup rate, to mitigate the harmful pressure spikes and mechanical loads that would otherwise occur during valve switching and volume conveyance.
2Device complexity
If the electromechanical brake booster or plunger system does not receive timely information from ABS/ESP, then the system complexity is reduced, but the pressure oscillation amplitude increases
Solution Approach 1:
The control device acts as an intermediary that receives information from the ABS/ESP control unit and processes it to generate predictive control signals for the brake pressure generator. This intermediary control layer translates the ABS/ESP intervention intentions into pre-coordinated pressure control actions, enabling the electromechanical brake booster or plunger system to respond appropriately without requiring direct complex communication protocols, thus reducing pressure oscillations while maintaining manageable system complexity.
3Stress or pressure
If the brake pressure generator builds up high pressure during ABS maneuvers, then the braking effectiveness is improved, but the hardware damage risk increases
Solution Approach 1:
The control device continuously monitors wheel speeds and predicts the resulting brake pressure by simulating the secondary control strategy. This feedback mechanism compares the predicted pressure against safe operating limits and automatically adjusts the brake pressure generator's output to prevent exceeding these limits. The closed-loop feedback ensures that high braking pressure is maintained when necessary for effectiveness while automatically reducing pressure buildup rate or magnitude when approaching dangerous levels, thereby preventing hardware damage.
Data Source
AI summary
An operational method for controlling a first brake pressure generator. The operational method includes reading the detected wheel speeds into the brake pressure generator control unit, simulating a control strategy of the secondary control unit for controlling the hydraulic unit based on the wheel speeds so that a brake pressure required at the respective wheel is ascertained, predicting the pressure resulting from the control strategy of the secondary control unit and the brake pressure at the first brake pressure generator, and controlling the first brake pressure generator in accordance with the predicted resulting pressure if the predicted resulting pressure exceeds a limit value, so that the pressure resulting at the brake pressure generator is lower than the predicted pressure due to an activation of the first brake pressure generator.