Brake Valve System for Balanced Pneumatic Control
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Solution Overview
Problem
Current vehicle braking systems fail to achieve brake balance during system-initiated braking, such as in adaptive cruise control, roll stability, and traction control, as primary and secondary brake circuits are activated separately, lacking the balance achieved in operator-initiated pneumatic braking.
Innovation Solution
A valve system that includes an electrical port for electronic control signals and a pneumatic port for operator-initiated signals, allowing pneumatic fluid to be transmitted from one independent source to control a second service brake and from another source to control a first service brake, ensuring balanced braking across both circuits through proportional pressure modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If separate activation of primary and secondary brake circuits is used for system-initiated braking, then electronic control functionality is achieved, but brake balance is not achieved
Solution Approach 1:
The system segments the brake control into primary and secondary circuits that can be independently controlled, yet coordinated through a common electronic control unit. Each circuit receives controlled pneumatic signals from the electronic control unit, allowing separate activation while maintaining overall balance through electronic coordination.
Solution Approach 2:
The electronic control unit monitors and coordinates the activation of both primary and secondary brake circuits, ensuring that braking forces are balanced across all wheels. The system uses feedback from brake sensors and vehicle dynamics to adjust pneumatic signal distribution and maintain brake balance during electronic-initiated braking events.
2Device complexity
If pneumatic fluid is transmitted from one independent source to control both service brakes, then device complexity is reduced, but brake balance deteriorates
Solution Approach 1:
The system maintains separate pneumatic fluid transmission paths from independent sources to the primary and secondary brake circuits. This segmentation preserves brake balance by allowing each circuit to be controlled by its own pneumatic source, preventing pressure imbalances that would occur with a single shared source.
Solution Approach 2:
The electronic control unit serves as an intermediary that coordinates the pneumatic signal distribution from independent sources. It ensures that both primary and secondary circuits receive appropriately timed and pressurized pneumatic signals, maintaining brake balance while managing the complexity of multiple independent pneumatic sources.
Data Source
AI summary
A valve includes at least one of an electrical port adapted to receive an electronic control signal and a pneumatic control port adapted to receive a pneumatic control signal. The valve also includes a pneumatic delivery port. The pneumatic delivery port is adapted to transmit a pneumatic fluid, based on the at least one of the received electronic control signal and the received pneumatic control signal, from a second independent source to control i) a second associated service brake and ii) delivery of the pneumatic fluid from a first independent source to control a first associated service brake.