Tire Pressure Control Using Compressor Work to Detect Vehicle Load
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Solution Overview
Problem
Existing methods for controlling internal pressure in supporting bodies like motor vehicle tires fail to accurately account for weight loads, leading to suboptimal pressure settings, especially in situations with varying payloads, and require manual intervention with manometers and additional sensors.
Innovation Solution
A method that measures the electrical work done by an electric-motor-driven compressor to determine the weight load by integrating motor current over time, comparing it to characteristic values, and adjusting internal pressure accordingly, allowing for closed-loop control without additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual pressure setting using a manometer is used, then the device complexity is reduced, but the manufacturing precision of tire pressure setting deteriorates
Solution Approach 1:
The patent replaces the mechanical manometer-based pressure measurement system with an electrical measurement system that uses motor current integration to determine weight load and calculate required tire pressure. The control unit processes electrical signals from the motor to automatically determine optimal pressure settings, eliminating the need for manual mechanical measurement while improving precision.
Solution Approach 2:
The system performs self-service by automatically determining the weight load on the vehicle through motor current measurement during compression, calculating the required tire pressure based on this load, and controlling the compression process to achieve the target pressure without manual intervention. The compressor system serves itself by using its own motor's electrical characteristics to guide the pressure setting process.
2Manufacturing precision
If additional sensors are added to detect weight load, then the manufacturing precision of pressure setting is improved, but the device complexity increases
Solution Approach 1:
The patent makes the motor multi-functional by using it not only to drive the compressor but also as a sensing element to detect weight load. The motor's electrical current characteristics serve dual purposes: driving the compression function and providing information about the load on the tires. This eliminates the need for separate weight sensors while improving measurement accuracy.
Solution Approach 2:
The motor serves itself by using its own electrical characteristics (current consumption during compression) to determine the weight load on the vehicle. Instead of requiring external sensors, the system extracts load information from the motor's operational parameters, making the motor both the actuator and the sensor.
3Reliability
If continuous manual pressure checks are performed, then the reliability of pressure maintenance is improved, but the loss of time increases
Solution Approach 1:
The patent implements a feedback control system where the control unit continuously monitors the motor current during compression, integrates this current to determine the actual weight load, compares the achieved pressure with the target pressure based on load, and adjusts the compression process accordingly. This closed-loop feedback ensures reliable pressure maintenance without requiring continuous manual checks.
Solution Approach 2:
The system replaces manual pressure checking with an automated electrical measurement and control system. The control unit continuously monitors compression parameters and automatically adjusts the process to maintain correct pressure, eliminating the need for repeated manual interventions while improving reliability.
4Productivity
If the compressor runs continuously to reach setpoint pressure, then the productivity is improved, but the use of energy increases
Solution Approach 1:
The patent applies dynamic control by continuously monitoring the motor current during compression and adjusting the compression process in real-time based on the detected weight load. The system adapts the compression rate and target pressure according to the actual load conditions, optimizing the balance between inflation speed and energy consumption rather than using a fixed continuous compression approach.
Solution Approach 2:
The feedback mechanism allows the control unit to monitor compression progress and weight load in real-time, enabling the system to stop compression at the optimal moment when the target pressure is reached. This prevents unnecessary continuous operation and energy waste while maintaining high productivity through intelligent control.
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
Enables automatic and accurate setting of internal pressure based on actual weight loads, simplifying the process for users and improving tire pressure accuracy without continuous manual checks or additional sensors.
Implementation Method 1
the electrical work WLoad necessary for this position change is determined during the increasing of the internal pressure by the compressor, in that the motor current ILoad of the drive motor of the compressor is measured with a constant motor voltage U and is integrated over the time of the pressure increase
Data Source
AI summary
A method for the weight-dependent control of the internal pressure of a supporting body loaded by a weight load or payload, wherein the internal pressure is produced by means of an electric-motor-driven compressor, and the weight load or payload which is present and which acts on a supporting body in the form of a mass mLoad under the effect of acceleration due to gravity g is determined in that a reduction and a subsequent increase in the internal pressure take place, wherein the increase in the internal pressure causes the position of an application point of the weight load or payload to change by a position difference ΔZ, wherein:during the increasing of the internal pressure by means of the compressor, the motor current ILoad of the drive motor of the compressor is measured with a constant motor voltage U and integrated over the time of the increase in pressure, and the electrical work WLoad which is necessary for the change in position is determined therefrom,wherein the electrical work WLoad the electrical work WLoad is compared with a characteristic value of the electrical work W0 from a characteristic diagram, wherein the change in position ΔZ, the difference in mass Δm and the difference in payload ΔFZ are determined from the difference ΔW between WLoad and W0 and the mass mLoad and the weight load or payload which is actually present as a result is determined therefrom.