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Systems and methods for humidity determination and uses thereof

A technology of relative humidity and sensors, which is applied in the direction of material analysis, instruments, and measuring devices using sound waves/ultrasonic waves/infrasonic waves, and can solve problems such as deterioration and sensor blackening

Active Publication Date: 2018-04-17
FORD GLOBAL TECH LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, in the case where the exhaust gas oxygen sensor is used for humidity sensing, frequent application of variable voltage may cause the sensor to blacken and eventually deteriorate

Method used

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  • Systems and methods for humidity determination and uses thereof
  • Systems and methods for humidity determination and uses thereof
  • Systems and methods for humidity determination and uses thereof

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Embodiment Construction

[0030] The following description relates to systems and methods for making relative humidity measurements and adjusting vehicle operating parameters in response to relative humidity determinations. Such measurements can be made by vehicle systems including internal combustion engines such as figure 1 Implementation of the vehicle system depicted in , where the vehicle may be further configured with one or more on-board cameras and one or more ultrasonic sensors. In some examples, the vehicle may be a hybrid vehicle capable of operating for an extended period of time without engine operation. Knowledge of relative humidity can improve the functionality of, for example, assisted or fully automated parking programs that can be accessed via, for example, figure 2 shown in the parking assist system. In some examples, such as Figure 3A As shown, a humidity measurement can be determined via an ultrasonic sensor based on the relationship between sound attenuation, relative humidi...

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Abstract

The invention relates to systems and methods for humidity determination and uses thereof. Methods and systems are provided for conducting measurements of relative humidity using an ultrasonic sensor.In one example, a plurality of ultrasonic signals having different frequencies are transmitted from a single sensor, and attenuation values of reflected signals are determined only for those signals determined to have the same transit time from transmission to receipt, and where frequency of the plurality of ultrasonic signals may be changed responsive to an indication that the signals may be below a signal-to-noise threshold. In this way, by determining a difference between attenuation values between pairs of signals, where the signals comprise different frequencies and where the signals comprise the same transit times, relative humidity may be accurately determined.

Description

technical field [0001] The present description generally relates to methods and systems for determining relative humidity via an ultrasonic sensor or other device, and adjusting one or more vehicle operating parameters based on the humidity determination. Background technique [0002] One or more ultrasonic sensors may be mounted on a motor vehicle, such as a hybrid electric vehicle (HEV), to enable distance determination between the sensors and external objects. Such an ultrasonic sensor may consist of at least a piezoelectric disk and a membrane configured to convert electrical energy into mechanical energy and vice versa. More specifically, an oscillating voltage may be applied to the piezoelectric disk so that the piezoelectric disk and the membrane vibrate at a frequency based on the voltage oscillating frequency and generate ultrasonic waves. After the wave is fired, the sensor waits for an echo to come back from the object, and when the echo interacts with the sensor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/032G01D21/02
CPCG01D21/02G01N29/032G01N2291/015G01N2291/021G01N29/024G01N29/343G01N29/348G01N2291/02845
Inventor M·麦奎林G·苏妮拉D·布鲁R·E·索尔蒂斯D·A·马克莱德M·哈基姆
Owner FORD GLOBAL TECH LLC
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