Ultra low-power monolithically integrated capacitive pressure sensor for tire pressure monitoring

Kolle, Christian; Scherr, Wolfgang; Hammerschmidt, Dirk; Pichler, Gerhard; Motz, Mario; Schaffer, Bernhard; Forster, B.; Ausserlechner, Udo

doi:10.1109/icsens.2004.1426147

Cited by 31 publications

(16 citation statements)

References 1 publication

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“…Considering the measured 28 nA for low power relaxation oscillator and junction leakage current, this topology leaves a total of 90% of charge available for RF-transmission, piezoresisitive sensor an battery self-discharge with a battery capacity of 250 mAh. Table I compares the achieved performance with previous works [9]. Since most work in this field is done in industry, the performances of related specifications of two commercial TPMS sensor have also been included in the table [7,8].…”

Section: Experiments Resultsmentioning

confidence: 99%

All switched-capacitor realized piezoresistive pressure sensor interface chip for automotive TPMS

Chen

Zhu

Huang

et al. 2013

IEICE Electron. Express

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An all switched-capacitor structure realized piezoresistive pressure sensor interface chip for automotive tire pressure monitoring system is presented. The propose integrated circuit consists of high resolution incremental ADC, low noise switched-capacitor amplifier, high accuracy bangdap reference and low-power relaxation oscillator and other related blocks. Proposed structure was implemented in standard 0.35 µm CMOS process with an area of 6.1 mm 2 . The experimental results show that the signal conditioning method provides high accuracy of 1% of the full scale output with a battery voltage from 3.6 V to 2.1 V over the full military temperature range. The charge consumption results into 25 mAh in 10 years, including sleep mode and junction leakage current.

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Section: Experiments Resultsmentioning

confidence: 99%

All switched-capacitor realized piezoresistive pressure sensor interface chip for automotive TPMS

Chen

Zhu

Huang

et al. 2013

IEICE Electron. Express

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“…This factor is eliminated in capacitive sensors (Gad-el-Hak, 2002). There is virtually no power consumption in the sensing element in capacitive pressure sensors due to the dc current component being zero (Gadel-Hak, 2002) and the low power capability of the capacitive measuring principle (Kolle et al, 2004).…”

Section: Capacitive Pressure Sensorsmentioning

confidence: 99%

“…Capacitive pressure sensors have been applied to TPMS devices due to their low power consumption, high accuracy and low temperature sensitivity (Rudolf and Hoogerwerf, 1997;APOLLO, 2003;Thurau and Ruohio, 2004;Kolle et al, 2004). Bracke et al (2007) presented the power consumption of various ultra-low power capacitive sensors' interfaces and showed experimentally that it is possible to achieve an average power consumption of 7.3 µW for a 10 Hz sampling frequency and 8 bit accuracy in the 100 to 130 kPa pressure range.…”

Section: Capacitive Pressure Sensorsmentioning

confidence: 99%

A micro-capacitive pressure sensor design and modelling

Kubba

Hasson

Kubba

et al. 2016

J. Sens. Sens. Syst.

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Abstract. Measuring air pressure using a capacitive pressure sensor is a robust and precise technique. In addition, a system that employs such transducers lies within the low power consumption applications such as wireless sensor nodes. In this article a high sensitivity with an elliptical diaphragm capacitive pressure sensor is proposed. This design was compared with a circular diaphragm in terms of thermal stresses and pressure and temperature sensitivity. The proposed sensor is targeted for tyre pressure monitoring system application. Altering the overlapping area between the capacitor plates by decreasing the effective capacitance area to improve the overall sensitivity of the sensor ( C/C), temperature sensitivity, and built-up stresses is also examined in this article. Theoretical analysis and finite element analysis (FEA) were employed to study pressure and temperature effects on the behaviour of the proposed capacitive pressure sensor. A MEMS (micro electro-mechanical systems) manufacturing processing plan for the proposed capacitive sensor is presented. An extra-low power short-range wireless read-out circuit suited for energy harvesting purposes is presented in this article. The developed read-out circuitry was tested in terms of sensitivity and transmission range.

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“…Recently the TPMSs, tires equipped with pressure sensors, are commercially available (19)(20) . In the case of installing our sensor systems to those TMPS tires, it is not preferable in terms of extra sensor weight and cost effectiveness.…”

Section: Air Pressure Effectsmentioning

confidence: 99%

“…Moreover, the COF data can be used for optimized driving control to maximize the road/tire friction force. In addition it will be possible to use the strain for a TPMS, which is mandatory in the United States as a result of the recent regulation of the TREAD Act (19)(20) .…”

Section: Introductionmentioning

confidence: 99%

Optical 3D Deformation Measurement Utilizing Non-planar Surface for the Development of an “Intelligent Tire”

Matsuzaki

Hiraoka

Todoroki

et al. 2010

JMMP

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Intelligent tires, also known as smart tires, are equipped with sensors to monitor the strain of the interior surface and the rolling radius of tire, and are expected to improve the reliability of tires and tire control systems such as anti-lock braking systems (ABS). However, the high stiffness of an attached sensor like a strain gauge causes sensors to debond from the tire rubber. In the present study, a novel optical method is used for the concurrent monitoring of in-plane strain and out-of-plane displacement (rolling radius) utilizing the non-planar surface of the monitoring object. The optical method enables noncontact measurement of strain distribution. The in-plane strain and out-of-plane displacement are calculated by using image processing with an image of the interior surface of a tire that is taken with a single CCD camera fixed on the wheel rim. This new monitoring system is applied to an aluminum beam and a commercially available radial tire. As a result, the monitoring system provides concurrent measurement of in-plane strain, out-of-plane displacement and tire pressure, and is shown to be an effective monitoring system for intelligent tires.

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Ultra low-power monolithically integrated capacitive pressure sensor for tire pressure monitoring

Cited by 31 publications

References 1 publication

All switched-capacitor realized piezoresistive pressure sensor interface chip for automotive TPMS

All switched-capacitor realized piezoresistive pressure sensor interface chip for automotive TPMS

A micro-capacitive pressure sensor design and modelling

Optical 3D Deformation Measurement Utilizing Non-planar Surface for the Development of an “Intelligent Tire”

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