Abstract:
A circuitry evaluates the signals of a yaw rate regulator (10) in a regulating circuit (5) for regulating the driving stability of a motor vehicle (4). The temperature-dependency of the sensor signal is compensated by a temperature sensor (7). The characteristic parameters of the yaw rate sensor (1) are however not only temperature-dependent, their temperature-dependency is also sensor-specific, i.e. it differs from sensor to sensor. This dependency is compensated by first evaluation means in a first regulation cycle-synchronic plane and by second evaluation means in an adaptation plane. The first evaluation means calculate the momentary yaw rate from the electric signals of the yaw rate sensor (1) and temperature sensor (7). The second evaluation means determine the temperature-dependent, specific characteristic parameters of the concerned yaw rate sensor (1).
Abstract:
Apparatus and methods for calibrating dynamic parameters of a vehicle navigation system are presented. One method may include determining whether reference position data of a vehicle is available, and measuring composite accelerations of the vehicle. The method may further include generating distance and turn angle data based upon a wheel speed sensors data, computing distance and turn angle errors based upon the independent position data, and associating the distance and turn angle errors with composite accelerations. A second method presented includes calibrating an inertial navigation sensor within a vehicle navigation system. The second method may include determining reference position data and Inertial Navigation System (INS) data, aligning an IMU with the vehicle, and aligning the IMU with an Earth fixed coordinate system. The second method may further include computing the vehicle alignment with respect to a horizontal plane, and determining calibration parameters for distance sensors associated with the vehicle.
Abstract:
In order to derive accurate DR heading information from the wheel speed, the distance between the centers of the tires, or the wheel track, must be known to high precision. Unfortunately, the wheel track may not always be known to a high level of accuracy whereby different classes of the same vehicle type can produce variations of up to 5 %. This current invention removes the error growth associated with wheel track error by automatically estimating and calibrating the wheel track. The wheel track is measured by computing a heading rate directly from the GPS Doppler measurements, and comparing it with the heading rate derived from the wheel sensors whereby subsequent refinements to the estimated wheel track are computed by filtering each measured track.
Abstract:
A method of determining a directional change of a vehicle carries out dead-reckoning for which it utilizes sensors provided on two wheels. In order to compensate for differences betweeen the wheels, the method utilizes given parameters in processing the data from the wheel sensors. The invention provides an extension of the method by estimating the parameters during normal operation of the vehicle, so that they are adapted to changing circumstances encountered by the vehicle. Estimation is performed by comparing data from the wheel sensors with independently determined directional data for a given period of time.
Abstract:
Le dispositif étant apte à équiper un véhicule (1, 2), il comporte au moins: un premier capteur (30) placé sur le côté dudit véhicule faisant face à l'entrée de ladite aire, ledit capteur qui peut être un lidar effectue des mesures de distance et d'orientation dudit véhicule par rapport à ladite aire à partir de la reconstruction d'un nuage de points appartenant à la surface des dites parois; une série de capteurs (31) placés sur les côtés latéraux dudit véhicule destinés à mesurer la distance desdits côtés aux parois latérales de l'aire de stationnement, ces capteurs pouvant être ultrasoniques ou optiques; des moyens de traitement (39) calculant la position et l'orientation relative dudit véhicule par rapport auxdites parois en fonctions des mesures des différents capteurs et en fonctions des différentes phases de la mise en parking.
Abstract:
The invention relates to a method for detecting cornering for a vehicle (2) with an automatic transmission. According to the invention, the current radius of a bend is determined based on the wheel speed signals of the front wheels. The beginning of a cornering status is determined when the current bend radius falls below a first limit bend radius and the end of a cornering status is determined when the vehicle has travelled a predetermined distance after exceeding a second limit bend radius.
Abstract:
Augmenting the GPS receiver (30) with some form of Dead Reckoning (DR) (40), to fill in the gaps occurring as a result of loss of GPS coverage and improve the accuracy of the GPS trajectory. A DR system (40) may take the form of a differential odometry system having separate left and right wheel sensors (73, 74) installed in the vehicle (10) to provide an indication of the speed of each wheel. However, the accuracy of the DR system (40) is critically dependent upon the accuracy to which the vehicle's (10) heading is determined.
Abstract:
Изобретение предназначено для экономии энергии, затрачиваемой железнодорожным подвижным составом, например, локомотивом на выполнение поездной и маневровой работы, при вождении поездов автоматическом режиме или в режиме помощи машинисту. Способ повышения кпд подвижного состава, включает следующие шаги: получают параметры подвижного состава, включающие, по крайней мере: скорость, координаты, напряжение контактной сети, напряжение токов тяговых двигателей, разрядку тормозной магистрали, также определяют, по крайней мере, параметры зависимости действующей силы тяги, силы торможения, силы сопротивления движению, силы сцепления колес с рельсами, массу подвижного состава, затем определяют оптимальное управление, реализуемое тяговым и тормозным оборудованием железнодорожного подвижного состава, на основании параметров зависимостей полученных на предыдущем шаге, после чего, передают оптимальное управление, определенное на предыдущем шаге, в систему управления подвижного состава для исполнения или отображения машинисту.
Abstract:
This invention relates to a device for obtaining the position information of a vehicle and a method for detecting the current position of a moving vehicle. The device comprises speed sensors provided on the left and right sides of the vehicle for sensing the speed of the left and right wheels and calculating means for calculating the changes of the advancing direction of the vehicle. It can solve the problem that the GPS can not work normally when the vehicle moves in a tunnel, under an elevated road and among high buildings without the use of any inertial navigation units. The method of this invention can be used to eliminate the invalid data caused by the interrupted or interfered GPS signals and the accumulated errors of the calculating results caused by calculating the position based on the speed and the direction, and obtain accurate and effective vehicle position information continuously.