Ultrasonic Fluid Sensing for Vehicle Engine Oil Identification
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Solution Overview
Problem
Existing methods for measuring fluid viscosity, such as viscometers and rheometers, are unsuitable for use in vehicles powered by internal combustion engines due to high temperatures and movement, which can lead to incorrect fluid usage and engine damage.
Innovation Solution
A system utilizing an ultrasonic sensor and temperature sensor to determine fluid characteristics by measuring time-of-flight and temperature, comparing these to baseline values to ensure correct fluid usage, integrated with a controller to output signals for fluid identification and monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional viscometers and rheometers are used to measure fluid viscosity, then measurement precision is improved, but the device cannot operate reliably in high-temperature and high-movement environments such as vehicles
Solution Approach 1:
The patent replaces mechanical measurement systems (viscometers and rheometers that use glass capillaries, rotation, or vibrations) with an ultrasonic measurement system. The ultrasonic sensor measures fluid characteristics by transmitting ultrasonic waves through the fluid and analyzing the time-of-flight and velocity of sound, which are affected by viscosity but are not influenced by temperature and movement in the same way mechanical systems are. This substitution enables reliable operation in vehicle environments.
Solution Approach 2:
The patent changes the measurement parameter from direct mechanical viscosity measurement to ultrasonic velocity and time-of-flight measurements. By measuring the speed of sound in the fluid and comparing it to baseline values at different temperatures, the system can determine fluid characteristics without being affected by the high-temperature and high-movement conditions that plague mechanical viscometers.
2Reliability
If ultrasonic time-of-flight measurement is used to sense fluid characteristics, then adaptability to high-temperature and high-movement environments is improved, but measurement precision may be affected by temperature variations
Solution Approach 1:
The patent incorporates temperature sensing and uses the temperature information to compensate for its effect on ultrasonic velocity measurements. By measuring both the ultrasonic time-of-flight and the temperature, and comparing against baseline values that account for temperature effects, the system can accurately determine fluid characteristics even in varying temperature conditions. The controller uses this feedback to distinguish between changes caused by temperature and changes caused by fluid viscosity or composition.
3Measurement precision
If baseline comparison methods are used to identify fluid characteristics, then fluid identification accuracy is improved, but the system complexity increases due to required baseline data storage and comparison logic
Solution Approach 1:
The patent establishes baseline ultrasonic velocity and time-of-flight values for known fluids at various temperatures before actual fluid identification is needed. These baseline values are stored in the controller's memory. When fluid identification is required, the controller simply compares the measured values against the pre-established baselines, which simplifies the real-time processing requirements while maintaining high identification accuracy.
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 accurate and reliable sensing of fluid characteristics within tanks in vehicles, preventing incorrect fluid usage and potential engine damage by providing real-time monitoring and comparison to baseline standards.
Implementation Method 1
The ultrasonic sensor is configured to output a ultrasonic pulse into the fluid, receive an echo of the ultrasonic pulse
Implementation Method 2
The controller is configured to determine a time-of-flight based on the output of the ultrasonic pulse and the received echo of the ultrasonic pulse
Implementation Method 3
receive an echo of the ultrasonic pulse
Implementation Method 4
The temperature sensor is configured to sense a temperature of the fluid and output a temperature signal corresponding to the temperature of the fluid
Implementation Method 5
determine a characteristic of the fluid based on the time-of-flight and the temperature signal
Data Source
AI summary
A method of sensing a fluid. The method includes determining a slope based on a first measurement of a first ultrasonic pulse traveling through the fluid, a second measurement based on a second ultrasonic pulse traveling through the fluid, a first temperature of the fluid, and a second temperature of the fluid. The method further includes comparing the slope to a predetermined slope and the first measurement to a predetermined measurement.