Analog Wheel State Detection Circuit for Low Power Sensor Analysis
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Solution Overview
Problem
Conventional sensors for determining the rotary state of vehicle wheels, especially those with oscillatory output signals, face high electrical energy consumption due to the need for continuous signal processing, which is detrimental for battery-powered systems.
Innovation Solution
An analog circuit with a storage capacitor and electronic comparison means is used to instantly analyze the output signal of the motion sensor by storing a reference value and comparing it with subsequent values, reducing energy consumption by only energizing the sensor and comparison means briefly to determine the rotary state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional digital signal processing is used to analyze oscillatory sensor output, then accurate wheel state determination is achieved, but electrical energy consumption increases significantly
Solution Approach 1:
The patent replaces complex digital signal processing systems with a simplified analog circuit consisting of a storage capacitor and comparison means. The analog circuit directly processes the oscillatory sensor signal by comparing it with a reference voltage, eliminating the need for continuous digital sampling and processing, thereby dramatically reducing electrical energy consumption while maintaining accurate wheel state determination.
Solution Approach 2:
The invention employs periodic sampling of the sensor signal rather than continuous processing. The storage capacitor holds a reference voltage value, and the comparison means periodically compare current signal values with this stored reference. This periodic action reduces energy consumption by keeping the comparison means inactive between sampling intervals, while still accurately detecting wheel rotation states.
2Reliability
If continuous signal processing is performed to determine wheel rotary state, then accurate real-time detection is achieved, but battery lifetime is reduced
Solution Approach 1:
The system performs signal processing at periodic intervals rather than continuously. The storage capacitor retains the reference voltage between sampling periods, and the comparison means are activated only when needed to compare current signal values with the stored reference. This periodic operation maintains real-time detection capability while significantly extending battery lifetime by reducing overall power consumption.
Solution Approach 2:
The storage capacitor pre-stores the reference voltage value before it is needed for comparison. This preliminary action eliminates the need to continuously generate or retrieve reference values during operation, reducing the active time of energy-consuming components and thereby extending battery lifetime while maintaining detection reliability.
3Use of energy by moving object
If analog circuit with storage capacitor is used instead of digital system, then energy consumption is reduced, but device complexity changes
Solution Approach 1:
The invention extracts only the essential functionality needed for wheel state detection from complex digital signal processing systems. By taking out just the core comparison function and implementing it with simple analog components (storage capacitor and comparison means), the system achieves dramatic energy reduction while maintaining adequate functionality for determining wheel rotary, rotationally immobile, or mobile states.
Solution Approach 2:
The patent changes the operating parameters from digital domain to analog domain. Instead of sampling, quantizing, and processing signals digitally, the system processes the sensor output directly in analog form using voltage comparison. This parameter change simplifies the circuit architecture by eliminating digital processing components while reducing energy consumption through analog operation.
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
This approach significantly reduces electrical energy consumption, achieving lower power usage compared to standard digital systems, with consumption reduced from 12 mA for 1 ms to less than 0.4 mA for 1 ms, while maintaining accurate determination of wheel state.
Implementation Method 1
analog circuit, termed the storage circuit, comprising at least one capacitor, and in electrically energizing the motion sensor in such a way as to store in the capacitor a value V1
Data Source
AI summary
A method of determining the rotary, rotationally immobile or mobile, state of a vehicle wheel, according to which the signal delivered by an active motion sensor fitted to the wheel is analyzed instantly according to a procedure consists, firstly, at time t1, in connecting the motion sensor to an analog circuit including at least one capacitor and interposed between the motion sensor and a first input of an electronic comparison element, so as to store in the capacitor reference value V1 representing the value of the signal at t1. Thereafter, the motion sensor is connected to a second input of the comparison element, to compare V1 with a value V2 representing the value of the signal at time t2, and to deliver a diagnostic signal representing either a rotationally immobile state of the wheel when V1=V2, or a rotationally mobile state of the wheel when V1≠V2.