Brake Control System Time-Offset Release for Slope Start Jerk Reduction
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Solution Overview
Problem
Existing brake control systems for motor vehicles experience discomfort and stress during transitions from stationary to moving on slopes due to simultaneous release of brake torque at all wheels, leading to uneven stress distribution and acoustic issues like starting jerks.
Innovation Solution
Implementing a time-offset release of brake torque at the wheel brakes, where the premature release at one axle occurs before the others, dependent on factors like road ascent, brake delay, and vehicle conditions, to manage stress distribution and direction changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If brake torque is released simultaneously at all wheels, then the vehicle can start moving quickly, but it causes uneven stress distribution and acoustic impairments like starting jerks
Solution Approach 1:
The brake control system divides the brake torque release process into separate segments for different axles. Instead of releasing brake torque simultaneously at all wheels, the system releases brake torque at one axle before releasing it at the other axle, creating a segmented temporal sequence that reduces stress on individual axles and eliminates starting jerks.
Solution Approach 2:
The system performs preliminary action by releasing brake torque at one axle before the vehicle actually starts moving. This preliminary release prepares the vehicle for smooth movement by reducing brake torque in advance at one axle, allowing the vehicle to transition smoothly from stationary to moving state without acoustic impairments.
2Ease of operation
If brake torque is released at one axle before the other, then starting comfort is improved, but the control system complexity increases
Solution Approach 1:
The brake control system implements dynamic control by adaptively adjusting the brake torque release sequence based on real-time vehicle conditions. The control unit determines whether to release brake torque at the first or second axle based on factors like direction of travel, road gradient, and vehicle load, making the system flexible and adaptive rather than fixed and rigid.
Solution Approach 2:
The system uses feedback from sensors (acceleration sensors, tilt sensors, speed sensors) to continuously monitor vehicle state and adjust the brake torque release sequence accordingly. This feedback mechanism allows the control unit to make informed decisions about which axle should release brake torque first, optimizing starting comfort while managing system complexity through intelligent control.
Data Source
AI summary
A brake control system and method for motor vehicles is provided with an electronic control unit, by which, when the motor vehicle is stationary, a parking brake function can be activated manually or automatically. Its deactivation occurs upon reaching a predefined release condition. In the presence of a release condition the brake pressure, which was built up for the parking brake function, is released in a time offset manner at least in relation to the axles of the vehicle by way of the control unit.