Patent application number | Description | Published |
20090234801 | APPROXIMATING QUERY RESULTS BY RELATIONS OVER TYPES FOR ERROR DETECTION AND OPTIMIZATION - A method and system is provided for computing an approximation of the results of a query. The approximation represents a superset of all possible results, by computing a set of records of types (as opposed to a set of records of values, which is the normal result of a query). This is different from conventional systems, which typically infer types for each field individually. For each record of types, one may also keep track of equalities of fields to improve the precision of the approximation. The approximation can be used to detect erroneous parts of queries that always return an empty result, regardless of the contents of the data source. Furthermore, the same approximation is also useful in performing optimizations: first, by eliminating parts of procedure calls that are guaranteed to be irrelevant to the calling context, and second, by eliminating unnecessary type tests in the query. | 09-17-2009 |
20090240649 | APPROXIMATING RELATION SIZES USING FIELD DEPENDENCIES - A method and system is provided for computing an approximation of the number of distinct results of a query over a relational data source. The approximation uses information about dependencies between fields of relations, in particular the number of distinct values of a field for each possible value of another field. This information can be obtained by analysis of the data stored in the relational data source, or may be specified as annotations to a database schema. An approximation of the number of results is and the dependencies between fields of each part of the query are computed. The approximation can be used to reorder parts of a query, by using the estimated size of parts to guide reordering. The approximation can further be used to determine which parts of a query are relevant to the evaluation of a subquery, which can be used to guide the magic sets transformation. | 09-24-2009 |
Patent application number | Description | Published |
20090033010 | Method and a jig for mounting a stack of Belleville Springs - The invention relates to mounting of a stack of Belleville springs about a shaft. The individual springs of the stack are first positioned over the shaft. A jig is then placed over the shaft and the springs and has at least one axially extending pressure bar that is radially inwardly biased to urge the inner circumferences of all the springs into contact with axially aligned points on the surface of the shaft. The springs are then compressed using a compression element while they are still urged by the pressure bar against the shaft. Finally, to retain the springs on the shaft and maintain the springs in compression, a split retaining clip is pressed onto to the shaft until it engages in a groove. | 02-05-2009 |
20100087993 | AGRICULTURAL VEHICLE WITH A CONTINUOUSLY VARIABLE TRANSMISSION - A vehicle is described having a continuously variable transmission by means of which torque is transmitted from an engine to drive wheels of the vehicle, a braking system for applying a braking force to the drive wheels and a controller for setting the transmission ratio of the transmission in such a manner as to maintain a desired speed of the drive wheels or of the engine. In the invention means are provided for applying to the controller a signal indicative of the engine applied torque, and means for supplying to the controller a signal to indicate application of wheel brakes. The controller is operative when the brakes are applied to discontinue setting the transmission ratio in dependence upon the speed of the drive wheels and to set the transmission ratio instead in such a manner as to minimise the absolute value of the engine output torque or the torque transmitted through the transmission or to follow a desired torque setpoint. | 04-08-2010 |
20100116605 | Apparatus for the Parking Lock of an Agricultural Vehicle - An apparatus for the parking lock of a vehicle, in particular, of an agricultural tractor. The apparatus comprises a parking lever mechanically linked to a braking lever by a cinematic chain. The braking lever comprises a tooth apt to engage at least a braking element vehicle. The braking lever is provided with a yielding device placed in correspondence to its own hinge. The yielding device is able to ease the engagement of the tooth with a gap comprised between two teeth of a driveline gear in order to guarantee a reliable parking lock of the vehicle. | 05-13-2010 |
20110056327 | Steering and Braking Pedal Arrangement for Tractors - A tractor steer-by-braking pedal arrangement. The pedal arrangement has a central brake pedal connected on one side to a right side pedal, and on the other side to a left side pedal. The central brake pedal acts on a brake system to produce the desired braking action. Each of the two side pedals when foot-operated by the driver, generates an activating signal to activate an electronic brake system, which only activates the brake required to steer-by-braking in the desired direction. | 03-10-2011 |
20140297158 | ENGINE CONTROL DEVICE FOR A WORK VEHICLE - An engine control device for a vehicle is provided, which comprises a control unit configured to be connected to the engine of a vehicle and to control the switching of the engine from a first idle rotation speed to a second idle rotation speed in which the number of engine revolutions is lower compared to the number of revolutions of the first idle speed. The control device also includes a first sensor, configured to be connected to the engine and to instantaneously sense and transmit to the control unit the number of revolutions completed by the engine in the unit of time. The control device further includes a second sensor for detecting the presence of an operator at the vehicle controls, and the second sensor is configured to transmit to the control unit a signal indicating the presence of an operator at the vehicle controls. The control unit is configured to actuate a decrease in the engine rotation speed from the first idle speed toward the second idle speed if the signal transmitted by the second sensor indicates the operator's absence and the signal transmitted by the first sensor indicates that the engine is running at the first idle speed. | 10-02-2014 |