Automated Braking Controller Modulator Valve Pressure
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Solution Overview
Problem
Current autonomous cruise control (ACC) systems often initiate aggressive braking, which can startle vehicle operators and lead to dissatisfaction, as they fail to maintain a smooth deceleration during comfort-focused braking events.
Innovation Solution
A controller system that determines maximum braking pressure based on identified urgency and adjusts valve states and modulator activation profiles to achieve reduced pressure braking, ensuring a smoother deceleration by setting the control valve to an open state and relay valves to a proportional pressure state, thereby modulating pressure to ≤80 psi for comfort-focused braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full system pressure is applied during ACC-initiated braking, then braking effectiveness is improved, but operator comfort deteriorates due to aggressive deceleration
Solution Approach 1:
The system changes the pressure parameter from full system pressure to reduced pressure (≤80 psi) specifically for ACC-initiated braking events. The controller determines whether to apply full or reduced pressure based on the braking scenario, using reduced pressure for comfort-focused braking to maintain safety while reducing operator discomfort from aggressive deceleration.
2Ease of operation
If reduced pressure braking is applied for comfort, then operator satisfaction is improved, but braking responsiveness deteriorates
Solution Approach 1:
The system dynamically adjusts the braking pressure based on the specific situation. The controller evaluates whether full pressure or reduced pressure should be applied according to the braking scenario, allowing the system to be responsive when needed while providing comfort when appropriate. This dynamic adaptation resolves the contradiction between responsiveness and comfort.
3Manufacturing precision
If full system pressure is used consistently, then braking control precision is maintained, but component wear increases
Solution Approach 1:
The system changes the pressure parameter from consistent full pressure to situation-dependent pressure levels. By applying reduced pressure (≤80 psi) for comfort-focused braking events while maintaining full pressure for emergency situations, the system preserves braking control precision when needed while reducing component wear during normal operation.
Data Source
AI summary
A controller comprises an electronic communication line configured to receive a system brake request control signal representing a requested system brake application and an identified urgency. A hardware processor, configured to perform a predefined set of basic operations in response to receiving the system brake request control signal, is capable of: determining a maximum braking pressure to be applied during the system braking application based on the identified urgency; generating a first system brake mode control signal, based on the determined maximum braking pressure, to set an associated first valve to a first valve state; generating a second system brake mode control signal, based on the determined maximum braking pressure, to set an associated second valve to a second valve state, the maximum braking pressure during the system braking application being set by the first valve state and the second valve state; determining an activation profile for an associated modulator based on the determined maximum braking pressure; the controller transmitting, via the electronic communication line, the first system brake mode control signal, the second system brake mode control signal and modulator control signals according to the activation profile.