Tire Pressure Detection Dynamic Measurement Cycle
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Solution Overview
Problem
Conventional tire pressure detection apparatuses struggle to detect a vehicle's running state at low speeds due to large measurement errors in acceleration sensors, leading to increased power consumption when attempting to minimize these errors.
Innovation Solution
The apparatus optimizes the measurement cycle of acceleration based on vehicle speed, setting it longer at standstill and shorter as the vehicle is assumed to be running, using a variance threshold to determine the running state and initiate frame transmission, thereby reducing power consumption while accurately detecting the running state at low speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measurement cycle is shortened to detect running state at low speed, then the detection accuracy is improved, but the power consumption increases
Solution Approach 1:
The measurement cycle is made dynamic rather than fixed. The controller automatically adjusts the measurement cycle length based on detected vehicle speed: using a first (longer) measurement cycle at low speeds to conserve battery power, and switching to a second (shorter) measurement cycle at high speeds to maintain detection accuracy. This dynamic adaptation resolves the contradiction between detection precision and power consumption.
Solution Approach 2:
The patent changes the temporal parameter (measurement cycle duration) based on operating conditions. By varying the measurement cycle from a first value to a second value according to vehicle speed, the system optimizes the balance between detection accuracy and energy consumption across different operating regimes.
2Use of energy by moving object
If the measurement cycle is lengthened to save power, then the power consumption is reduced, but the detection accuracy at low speed deteriorates
Solution Approach 1:
The system dynamically adjusts the measurement cycle based on vehicle speed conditions. At low speeds where detection accuracy is critical, the controller uses a shorter first measurement cycle. At high speeds where power conservation is more important, it switches to a longer second measurement cycle. This dynamic switching resolves the contradiction between power consumption and detection accuracy.
Solution Approach 2:
The measurement cycle parameter is changed according to vehicle speed. The controller selects between a first measurement cycle (shorter duration) and a second measurement cycle (longer duration) based on detected speed thresholds, optimizing the trade-off between power consumption and detection precision for different operating conditions.
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 configuration allows for accurate detection of a vehicle's running state at low speeds while minimizing power consumption, preventing erroneous standstill state detection and ensuring efficient tire pressure monitoring.
Implementation Method 1
an acceleration sensor, which detects an acceleration including a centrifugal acceleration caused by rotation of the wheel and a gravitational acceleration
Implementation Method 2
an acceleration sensor, which detects an acceleration including a centrifugal acceleration caused by rotation of the wheel and a gravitational acceleration
Implementation Method 3
a radio wave transmitter that transmits the frame
Data Source
AI summary
A tire pressure detection apparatus includes: a transmitter at each of a plurality of wheels with a tire; and a receiver at a vehicle body. The transmitter has: a sensing device having a pressure sensor outputting a detection signal related to a tire pressure of each of the plurality of wheels and an acceleration sensor detecting an acceleration including a centrifugal acceleration caused by rotation of the wheel and a gravitational acceleration; a first controller performing signal processing on the detection signal of the pressure sensor and creating a frame storing data related to the tire pressure; and a radio wave transmitter transmitting the frame. The receiver has: a radio wave receiver receiving the frame; and a second controller detecting a tire pressure based on the data related to the tire pressure stored in the received frame.