Class / Patent application number | Description | Number of patent applications / Date published |
340443000 | By indirect detection means (e.g., height measurement) | 27 |
20080238644 | Device for Detecting the Condition of a Tire on a Wheel - A device for detecting the condition of a tire ( | 10-02-2008 |
20090079556 | TIRE PRESSURE MONITORING SYSTEM HAVING A COLLAPSIBLE CASING - A tire pressure monitoring device and system includes a support or housing mounted to a rim of a wheel of a vehicle. A casing is movably secured to the support and a pair of spaced magnets are disposed within the casing. The casing is collapsible for varying the length of the casing in response to changes in the tire pressure to move the magnets relative to each other. A sensor is mounted a distance from the casing for sensing a presence of each of the magnets. A controller is in communication with the sensor to determine the length of the casing and the relative movement between the magnets to calculate any changes in tire pressure. | 03-26-2009 |
20090085733 | Tire pressure, speed and acceleration monitoring system and method - The tire pressure, speed and acceleration monitoring system of the present invention has a transducer mounted to the wheel of a motor vehicle and a controller mounted to a non-rotating part of the vehicle. The transducer is passive and receives its power from an interrogation signal from the controller. The transducer replies with a pressure signal. The tire pressure may be frequency encoded. This is accomplished by having a resonant circuit whose resonant frequency depends on the tire pressure. Speed and acceleration are calculated by determining when the transducer passes the receiver of the controller. Since the range of the transducer is very limited, the transducer will only respond to an interrogation signal when the transducer is next to the controller receiver. The transducer has a tire pressure fill valve. | 04-02-2009 |
20090102635 | METHOD OF MANAGING A NETWORK OF SENSORS, A SENSOR NETWORK, AND A VEHICLE PROVIDED WITH SUCH A NETWORK - The network of sensors comprises at least two nodes, each forming a measurement unit including a sensor, and a node forming a processor unit to which the measurement units are connected. Each measurement unit is designed to acquire measurements and to transmit a measurement that is a function of said measurements to the processor unit. During the method of managing the network, the measurement acquisition sequences performed by the measurement units are synchronized with one another by means of a synchronization signal sent by the processor unit to each of the measurement units. | 04-23-2009 |
20090128315 | METHOD FOR DETERMINING ABSOLUTE TIRE ROLLING CIRCUMFERENCES AND TIRE PRESSURE CONTROL SYSTEM - A method of determining absolute rolling circumferences of tires of a motor vehicle is disclosed, in which the absolute rolling circumferences (U | 05-21-2009 |
20090128316 | METHOD FOR ALARMING DECREASE IN TIRE AIR-PRESSURE - An object is to provide a method capable of reducing calculation number of times for obtaining a primary regression line of a slip ratio and acceleration, and detecting a decrease in internal pressure of tires with high accuracy even in the case where is no evenness in a road surface. | 05-21-2009 |
20090256696 | METHOD AND APPARATUS FOR DETECTING DECREASE IN TIRE AIR PRESSURE AND PROGRAM FOR DETERMINING DECREASE IN TIRE AIR PRESSURE - The method includes: a step of calculating wheel rotation information; a judgment step of judging a decrease in a tire air pressure by comparing a predetermined reference value with a decreased pressure judgment value showing a wheel speed ratio of the front and rear axes; an initialization step of storing the wheel speed ratio between the front and rear axes at the regular internal pressure; and a step of determining whether the distribution of the front and rear driving torque is equidistribution or not. | 10-15-2009 |
20100013616 | APPARATUS AND METHOD FOR DETECTING DECREASE IN TIRE AIR PRESSURE AND PROGRAM FOR DETECTING DECREASE IN TIRE AIR PRESSURE - The invention includes: a rotation velocity information detection means for regularly detecting tire rotation velocity information regarding the respective wheels of a vehicle; a frequency characteristic estimation means for estimating a frequency characteristic of the rotation velocity information based on the rotation velocity information obtained from the rotation velocity information detection means; and a determination means for determining a decrease in the air pressure of the tire based on the estimated frequency characteristic. The frequency characteristic estimation means is configured to extract a resonance peak of the rotation velocity information by calculating a gain corresponding to an arbitrary frequency. | 01-21-2010 |
20100013617 | APPARATUS AND METHOD FOR DETECTING DECREASE IN TIRE AIR PRESSURE AND PROGRAM FOR DETECTING DECREASE IN TIRE AIR PRESSURE. - An apparatus for detecting a decrease in a tire air pressure includes; a rotation velocity information detection means for regularly detecting tire rotation velocity information regarding the respective wheels of a vehicle; a resonance frequency estimation means for estimating a resonance frequency of the rotation velocity information based on the rotation velocity information obtained by the rotation velocity information detection means; and a determination means for determining, based on the estimated resonance frequency, a decrease in the tire air pressure. The apparatus includes a data rejecting means for rejecting data of rotation velocity information hindering the estimation of the resonance frequency. | 01-21-2010 |
20100225463 | APPARATUS AND METHOD FOR DETECTING TIRE HAVING DECREASED PRESSURE, AND PROGRAM FOR DETECTING TIRE HAVING DECREASED PRESSURE - An apparatus for detecting a tire having a decreased pressure based on resonance frequency of tires attached to respective wheels of a vehicle. The apparatus includes a storage means for storing information regarding a distribution of resonance frequencies respectively corresponding to a plurality of air pressure statuses, an initialization means for estimating a frequency characteristic of the rotation speed information or the rotation acceleration information, a frequency estimation means for estimating a frequency characteristic of the rotation speed information or the rotation acceleration information of a running vehicle, and a Bayesian estimation means for subjecting a tire pressure status at a certain time to a Bayesian estimation based on the resonance frequency during the initialization, a resonance frequency at the certain time obtained from the frequency estimation means, and distribution-related information stored in the storage means. | 09-09-2010 |
20110210841 | System and Method for Indirect Indication of Tire Pressure Loss - A method of indirect tire pressure monitoring for indicating when a pneumatic tire on a wheel at one end of a motor vehicle axle is underpressurized relative to a pneumatic tire on a wheel at an opposite end of the axle while the vehicle is being driven on a road surface. ABS wheel sensors are used as inputs to a devoted processor for indirect tire pressure monitoring. | 09-01-2011 |
20110221587 | TIRE WEAR DETECTION DEVICE - A tire wear detection device includes a wear detector embedded in a tread of a tire, a sensor unit arranged on a wheel, and a receiver unit arranged on a vehicle body. The wear detector includes a piezoelectric element and a resonance circuit, which generates a radio wave signal from a voltage signal generated by the piezoelectric element. The sensor unit transmits through wireless communication a pressure data signal indicating an internal air pressure of the tire, generates a wear data signal indicating a wear state of the tire based on the received radio wave signal, and transmits through wireless communication the wear data signal. The receiver unit receives the pressure data signal and the wear data signal from the sensor unit. | 09-15-2011 |
20120075089 | Tire Monitoring in Vehicles - An apparatus, method, and computer program product for monitoring a tire are provided. An apparatus comprises a laser system comprising a number of lasers configured to identify a radius of a tire of a vehicle located on a ground, wherein a laser in the number of lasers is associated with an axle of the tire. The apparatus also comprises a tire monitoring system configured to identify a set of acceptable radii for the tire using a weight of the vehicle and information about the tire, determine whether the radius of the tire is within the set of acceptable radii, and generate an indication that the radius of the tire is not within the set of acceptable radii comprising the radius of the tire responsive to an absence of a determination that the radius of the tire is within the set of acceptable radii. | 03-29-2012 |
20120086566 | SYSTEM AND METHOD FOR EVALUATING SURFACE FINISH OF TIRE RETREAD - A measurement system scans the given surface of a tire component (e.g., a brush-finished tread or buffed tire casing) to electronically measure data points corresponding to vertical and horizontal coordinates along the given surface. Associated computer processors electronically calculate the slope at a plurality of different locations by determining the degree of steepness (e.g., rise over run, angle or grade) between selected ones of the first and second coordinates and electronically comparing at least one slope-based parameter to one or more predetermined levels to determine a characterization defining one or more of surface adhesion fitness, finishing brush wear level and brush bristle placement location. Slope may be determined between every adjacent pair of data points or between selected data points (e.g., identified local maximum and minimum). The at least one-slope based parameter compared to the predetermined levels may correspond to the slopes themselves or to a calculated average slope value. | 04-12-2012 |
20140070935 | REAL-TIME WIRELESS DYNAMIC TIRE PRESSURE SENSOR AND ENERGY HARVESTING SYSTEM - An instantaneous/real-time wireless dynamic tire pressure sensor (DTPS) for characterizing pavement qualities and for detecting surface and subsurface pavement defects under normal driving conditions. Signal processing provides quantitative assessment of surface conditions. DTPS includes a vehicle tire valve stem-mounted pressure sensor and wheel hub-mounted signal conditioning, amplification, and transmitting circuitry. A signal processing computer within the vehicle is wirelessly coupled to the hub-mounted circuitry. Tire pressure changes caused by ground vibration excitation from the interaction between the tire and pavement at normal driving speeds are detected. When acoustic radiation from a surface wave is significantly stronger than acoustic noise, subsurface information can be extracted. An energy harvester based on strong magnetostatic coupling between a high permeability core solenoid, fixed proximate a vehicle wheel, and a bias magnet array, fixedly mounted in conjunction with a dust shield, can provide power the DIPS. | 03-13-2014 |
20140167949 | TIRE SEPARATION WARNING SYSTEM AND METHOD - A tire separation warning system and method that includes a sensor that senses pressure of a tire and a receiver that calculates the amount of change in tire radius from the pressure of the tire received from the sensor. In addition, the receive estimates tire separation risk. A display warns a driver of the tire separation risk, when the tire separation risk is transmitted from the receiver. | 06-19-2014 |
20150091720 | DEVICE AND METHOD FOR DETECTING A PRESSURE CHANGE IN A TIRE - A device for detecting a pressure change in a tire includes a first temperature sensor located outside the tire, the first temperature sensor being configured to produce a first temperature signal indicative of a first temperature, an input apparatus configured to receive the first temperature signal from the first temperatures sensor, and to receive a second temperature signal from a second temperature sensor, the second temperature signal being indicative of a second temperature, and to receive a tire pressure signal from a tire pressure sensor, the tire pressure signal being indicative of a tire pressure of the tire, and a processor configured to output an evaluation signal including information about a change of tire pressure based on the pressure signal and based on the first temperature signal and the second temperature signal. | 04-02-2015 |
340444000 | Relative wheel speed | 10 |
20080238645 | Mehtod for alarming a decrease in tire air-pressure and device thereof, and program thereof - The subject is to provide a method for alarming a decrease in tire air-pressure that can improve the precision of the reduced pressure judgment and a device thereof and a program for judging the decrease in tire air-pressure. | 10-02-2008 |
20080272899 | ROLLOVER PREDICTION AND WARNING METHOD - A system for determining a rollover property of a vehicle includes sensors capable of sensing lateral acceleration, a first left tire rotational speed, a first right tire rotational speed, and a mass property. The sensors output a lateral acceleration signal, a first left tire rotational speed signal, a first right tire rotational speed signal, and a mass property signal. A processing unit receives the signals and uses the received signals to determine a rollover property of the vehicle. | 11-06-2008 |
20090115590 | Tyre and System for Monitoring the Tyre During the Running of a Vehicle - A method for monitoring a tyre during running includes acquiring and storing, at least temporarily, a first curve representing an acceleration profile of a first point of a tread area of the tyre; acquiring and storing, at least temporarily, at least one second curve representing an acceleration profile of a second point of the tread area; and comparing the first curve and the at least one second curve, or parameters derived from the first curve and the at least one second curve, so as to determine a dynamic behavior of the tyre. The first and second points are located substantially on a same meridian plane of the tyre. A related tyre, wheel for a vehicle, system for monitoring a tyre during running, and method for controlling a vehicle are also disclosed. | 05-07-2009 |
20090261961 | METHOD AND APPARATUS FOR DETECTING DECREASE IN TIRE AIR PRESSURE AND PROGRAM FOR DETERMINING DECREASE IN TIRE AIR PRESSURE - A method of detecting a decrease in a tire air pressure based on wheel rotation information obtained from tires attached to a four-wheel vehicle. The method includes: a step of calculating wheel rotation information obtained from the respective wheel tires; a step of computing the first to the third judgment values DEL | 10-22-2009 |
20100060443 | APPARATUS FOR ESTIMATING TIRE WEAR AMOUNT AND A VEHICLE ON WHICH THE APPARATUS FOR ESTIMATING TIRE WEAR IS MOUNTED - A vehicle velocity detector | 03-11-2010 |
20100134268 | APPARATUS AND METHOD FOR DETECTING DECREASE IN TIRE AIR PRESSURE AND PROGRAM FOR DETECTING DECREASE IN TIRE AIR PRESSURE - The apparatus for detecting a decreased air pressure of a tire includes an acceleration calculation means for calculating, based on rotation velocity information of tires of respective wheels of a vehicle; | 06-03-2010 |
20110260849 | APPARATUS, METHOD, AND PROGRAM FOR DETECTING DECREASE IN TIRE AIR PRESSURE - An apparatus for detecting a decrease in a tire air pressure includes: a rotation information detection means for periodically detecting tire rotation information regarding the respective wheels of a four-wheel vehicle; a wheel speed calculation means for calculating tire wheel speeds based on the rotation information; a comparison value calculation means for calculating a difference between a sum of wheel speeds of two wheels at one diagonal positions and a sum of wheel speeds of two wheels at the other diagonal positions as a first comparison value and for calculating a difference between a sum of wheel speeds of two wheels at one same side positions and a sum of wheel speeds of two wheels at the other same side positions as a second comparison value; a determination means for determining a tire having a decreased pressure; and an alarming means. The apparatus further includes a conversion means for converting the first comparison value and the second comparison value to a plane for which change amounts of the first comparison value and the second comparison value due to a decreased pressure from the normal value learnt during a time of a normal pressure are unified between front wheels and rear wheels, and the determination means is so configured as to perform a decreased pressure determination by a single determination threshold value. | 10-27-2011 |
20120025968 | TIRE AIR PRESSURE MONITORING DEVICE - A tire air pressure monitoring device for monitoring the air pressure of a tire on a vehicle having two or more tires, including an air pressure sensing device that senses air pressure information of the tire and is adapted to be mounted at a prescribed position on the tire so as to rotate with the tire, a transmitting device that transmits the sensed air pressure information, a rotary position sensing device that senses the rotary position of the air pressure sensing device as the tire rotates, a period of rotation calculating device that calculates the period of rotation of the tire, a period of rotation disruption sensing device that senses disruption in the period of rotation based on a change in the period, and a transmission control device that outputs commands to transmit the air pressure information to the transmitting device based on a disruption in the period of rotation. | 02-02-2012 |
20140340213 | WHEEL POSITION DETECTOR AND TIRE INFLATION PRESSURE DETECTOR HAVING THE SAME - A wheel position detector for a vehicle includes: a transmitter at each wheel having a first controller for generating and repeatedly transmitting a frame with specific identification information and an acceleration sensor; a receiver at a vehicle body receiving the frame from one wheel and having a second controller for performing wheel position detection; and a wheel speed sensor for detecting a tooth of a gear. The second controller acquires gear information indicating a tooth position; sets a variation allowance based on the tooth position; registers the one wheel with using the variation allowance; sets another variation allowance based on another tooth position when the receiver receives a new frame; and changes the variation allowance to a new variation allowance provided by an overlap portion between the variation allowance and another variation allowance. | 11-20-2014 |
20160001613 | METHOD AND SYSTEM FOR MONITORING PRESSURE OF TIRE - Disclosed are a method and a system for monitoring the pressure of a tire. The system measures frequencies of multiple tires mounted on the vehicle, sets a first average frequency for a normal pressure state and a second average frequency for determination of a low pressure state, wherein the first average frequency is calculated by accumulating the measured frequencies for each speed interval in a stop mode and the second average frequency is calculated by accumulating the measured frequencies for each speed interval in a driving mode, calculates low-pressure probabilities for each speed interval of the tire by using the second frequency, a predetermined low-pressure reference frequency, and a predetermined frequency determination interval for determining low-pressure, and determines whether each tire is at low pressure state by aggregating the low-pressure probabilities for each speed interval of the tire. | 01-07-2016 |