Trailer Valve System for ABS Air Pressure Compensation
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Solution Overview
Problem
Current trailer control strategies lack a mechanism to compensate for air volume loss and verify the delivery of required air pressure to the trailer in the antilock braking system (ABS) modulator.
Innovation Solution
A valve system comprising an isolation check valve, a double-check valve, and a control module that delivers pneumatic fluid based on the higher of two braking demands, ensuring consistent air pressure delivery and compensating for air volume loss by using a restrictor to manage airflow and a park control module that selectively transmits pneumatic fluid based on park brake signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay valve is used to apply full system air pressure to the ABS modulator, then the braking control function is achieved, but there is no mechanism to compensate for air volume loss in the trailer
Solution Approach 1:
A pressure sensor is installed in the trailer air line to detect the actual air pressure in the trailer. The sensor signal is transmitted to the control module, which compares the detected pressure with the target pressure and adjusts the air supply accordingly to compensate for any pressure loss or leakage in the trailer system.
Solution Approach 2:
The patent replaces the traditional purely mechanical relay valve system with an electronically controlled system. The control module uses electronic signals from the pressure sensor to control the relay valve, enabling precise adjustment of air pressure and volume to the trailer, thereby compensating for air volume loss that cannot be detected by mechanical systems alone.
2Force
If full system air pressure is delivered to the trailer, then braking power is maximized, but there is no verification that the required air pressure has been delivered
Solution Approach 1:
The pressure sensor continuously monitors the air pressure in the trailer air line and transmits this information to the control module. This feedback loop provides real-time verification of whether the required air pressure has been delivered to the trailer, allowing the system to confirm proper braking power delivery or detect and correct pressure deficiencies.
3Measurement precision
If the ABS modulator holds off pressure, then brake control precision is improved, but air volume loss cannot be compensated
Solution Approach 1:
While the ABS modulator maintains precise brake control by holding off pressure, the separate pressure sensor continuously monitors the trailer air line pressure. The control module uses this feedback information to independently adjust and compensate for any air volume loss in the trailer supply line, maintaining both precision control and pressure compensation simultaneously.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures reliable air pressure delivery to the trailer, compensating for air volume loss and verifying the required pressure, thereby enhancing the trailer's braking performance and safety.
Implementation Method 1
an isolation check valve delivering pneumatic fluid as a supply pressure
Implementation Method 2
a double-check valve adapted to deliver a braking demand control signal of the pneumatic fluid based on a higher of a first braking demand in a first pneumatic braking circuit and a second braking demand in a second pneumatic braking circuit
Implementation Method 3
The control module is adapted to receive the supply pressure as a control module supply pressure of the pneumatic fluid, receive a control module control pressure of the pneumatic fluid based on the braking demand control signal, and deliver a control module delivery pressure of the pneumatic fluid based on the control module supply pressure and the control module control pressure
Implementation Method 4
A park control module selectively transmits the pneumatic fluid at the supply pressure based on a park brake control signal
Data Source
AI summary
A valve system includes an isolation check valve delivering pneumatic fluid as a supply pressure, a double-check valve adapted to deliver a braking demand control signal of the pneumatic fluid based on a higher of a first braking demand in a first pneumatic braking circuit and a second braking demand in a second pneumatic braking circuit, and a control module. The control module is adapted to receive the supply pressure as a control module supply pressure of the pneumatic fluid, receive a control module control pressure of the pneumatic fluid based on the braking demand control signal, and deliver a control module delivery pressure of the pneumatic fluid based on the control module supply pressure and the control module control pressure. A park control module selectively transmits the pneumatic fluid at the supply pressure based on a park brake control signal.