Brake Pump Speed Adjustment for Deceleration NVH Control
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Solution Overview
Problem
Current brake pump systems face challenges in adjusting maximum speed effectively to achieve high rates of deceleration without causing jerking or noise, vibration, and harshness (NVH) in vehicles, especially when using adaptive cruise control systems.
Innovation Solution
The system includes a maximum speed regulator that adjusts the brake pump's maximum speed based on the difference between target and measured decelerations, using sensors to detect the rate of change and measured deceleration, allowing for adaptive adjustment to maintain safe distances and reduce NVH.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the brake pump operates at maximum speed to achieve high rates of deceleration, then the deceleration performance is improved, but jerking and noise, vibration, and harshness (NVH) occur
Solution Approach 1:
The brake pump's maximum speed is made dynamically adjustable rather than fixed. The control system continuously monitors the difference between target and actual deceleration rates, and dynamically adjusts the pump's maximum speed accordingly. This allows the system to operate at high speeds when needed for rapid deceleration while reducing speed during normal operation to eliminate jerking and NVH.
Solution Approach 2:
The system changes the operational parameters of the brake pump based on real-time conditions. By adjusting the maximum pump speed parameter according to the deceleration error (difference between target and measured deceleration), the system optimizes performance to achieve high deceleration rates when necessary while maintaining comfort during steady-state operation.
2Productivity
If the maximum pump speed is increased to improve deceleration response, then the productivity of the braking system is improved, but the device complexity increases due to speed regulation mechanisms
Solution Approach 1:
The system employs a feedback control mechanism where the actual deceleration (measured by sensors) is continuously compared with the target deceleration. This feedback loop automatically adjusts the brake pump's maximum speed without requiring complex manual intervention or additional mechanical complexity. The regulator uses the deceleration error signal to automatically modulate pump speed, achieving high productivity while maintaining relatively simple system architecture.
Data Source
AI summary
Method and apparatus are disclosed for adjustment of maximum brake pump speed based on target and measured decelerations. An example vehicle includes a brake pump having a maximum pump speed. The example vehicle also includes a vehicle decelerator to determine a target deceleration for autonomous deceleration and send a signal to the brake pump to decelerate the vehicle at the target deceleration. The example vehicle also includes a first sensor to detect a measured deceleration and a maximum speed regulator to adjust the maximum pump speed based on a difference between the target deceleration and the measured deceleration.