Abstract:
A proportional pressure adjustment valve is described which comprises one valve part with inlet and outlet openings (4) and at least one closing mechanism (7) for control of a valve (12), the same as a magnet part having one magnet core, one magnet coil and one displaceably disposed magnet armature. An actuating element (11) cooperates with the armature, actuating the spherical closing mechanism (7). The hydraulically active cross section of the valve (12) is essentially determined by the length of the valve (L), the diameter of the valve (D) and th diameter (d) of the part (13) of the actuating element (11) which penetrates into the valve. According to invention, the ratio of the length of the valve (L) to the diameter of the valve (d) is less than 2.0.
Abstract:
In a shifting device such as generally used in automatic transmissions, a regulating device (15) is provided by the swiveling of which to a shifting gate (13) the automatic multiplication stages can be preselected. Besides, the regulating device can be transferred to a second shifting gate (14) via a transverse gate (17). According to the invention, in the second shifting gate (14) a characteristic field (1) is influenced by a continuously variable incremental or decremental change of individual operation parameters or a combination of at least two parameters. The operation parameters consist of the engine speed, the transmission ratio and the output speed.
Abstract:
The invention concerns a control system (10) for changing automatic gears (3) that operates according to fuzzy logic methods. All the fuzzy-production rules are divided into at least three sections: a set of basic rules to determine the gear-changing point in a consumption-oriented driving style, a set of adaptation rules to modify the set of basic rules depending on a current driving style and an identification set of rules for classifying the driver according to his/her driving style. By way of a supplementary set of adaptation rules the set of basic rules can be additionally modified according to a current driving condition. Individual function blocks (11 to 15) operate preferably according to the same inference mechanism. Gamma operators are used in order to approximate as closely as possible human behavior. A process is proposed for generating membership functions to determine a running condition by fuzzy-production rules. In a preferred embodiment the adaptive gear-changing behavior is activated by forming offsets. Priorities are allotted to the rules especially for reasons of safety and reliability.
Abstract:
In a process for controlling the torque of an internal combustion engine, an automatic gear system driven by the internal combustion engine includes a gear control device (1) and the internal combustion engine has a control device which, based on speed, load and, where appropriate, temperature signals, controls an ignition angle of an ignition system and/or an injection pulse width of a fuel injection system. The gear control device (1), for its part, controls on the basis of speed and load requirement signals the gear changes of the automatic gear. To improve the control of the whole drive unit, for the purpose of reducing fuel consumption and having smooth gear changes, the computer systems of the gear control drive (1) and of the control (2) of the internal combustion engine constantly intercommunicate via interfaces (3), the control device (2) of the internal combustion engine receiving from the gear control (1), in a cyclic time beat, a percentage torque requirement (PLF) on the basis of which the control device (2) automatically influences the torque of the internal combustion engine.
Abstract:
An electric servomotor for a power-assisted steering system in a vehicle has a stator laminated core having an outer diameter and an active length. In order to provide an electric servomotor for a power-assisted steering system that has an optimum diameter/length ratio and that covers a steering performance range from compact cars to full-size vehicles using a reasonable change in volume, it is provided that, with a constant outer diameter, the ratio of the outer diameter to the active length of the stator laminated core can be varied such that the electric servomotor can be used for power-assisted steering systems for compact cars up to full-size cars and the outer diameter is constant.
Abstract:
The invention relates to a proportional valve, especially for regulating the shifting pressure in an automatic transmission for a motor vehicle. The inventive valve is subdivided into a hydraulic section and into an electric section by a magnetic interface (XXXX). The bearing points (1, 2) of the hydraulic valve slide are arranged on the side of the valve opposite the electric coil, i.e. in the hydraulic section, so that the armature (5) projects into the coil space in a floating manner.
Abstract:
The invention concerns a gear-change control systems (10) for an automatic transmission (3). Input variables, derived from a driver-vehicle system, are established. Output variables are established by fuzzy logic methods and used to determine a gear-change ratio. A fuzzy logic module, which imitates the operating method of a logical flip-flop and additionally permits continuous intermediate values, is used to consider driving states brought about by different situations.
Abstract:
In order to improve the shifting characteristics of an electrohydraulically controlled, automatically shifting transmission particularly during cornering and braking, the driving speed (v), the lateral acceleration (aq), and the time variation of the throttle valve position are sensed in addition to the throttle valve position (alpha) and the engine rotational speed (nmot). From the time variation of the throttle valve position, a signal can be derived for the prevention of an upshifting operation since a motor vehicle driver's foot moves away faster from the accelerator pedal when approaching a bend in the road than would be the case for the normal deceleration of the motor vehicle.
Abstract:
An electric power steering system, and in particular a power-assisted steering system for a vehicle, comprises a steering transmission housing and a housing cover which forms an axial closure of the steering transmission housing and which is penetrated by an axially displaceable component of the steering transmission. In order to provide an electric power steering system which is easy to assemble and is not susceptible to wear, in an axially outer region of the housing cover, a first guide bushing for the axially displaceable component is integrated in the housing cover.
Abstract:
A continuously variable transmission for a motor vehicle, possessing a variator (2, 2′) with a primary V-pulley set (3, 3′) and a secondary V-pulley set (4, 4′). In this arrangement are a primary V-pulley disk (5, 5′) and a secondary V-pulley disk (6, 6′), which are axially slidable by hydraulic force for the controlled adjustment of a pressure can be, respectively, loaded with an oil flow through an electro-hydraulically controlled pressure supply apparatus (1, 1′). The pressure supply apparatus (1,1′) is so designed, that the oil flow is brought to the V-pulley disks (5, 5′, 5, 6′) through a pressure line (8, 8′, 9, 9′) with at least one pressure controller (10, 10′, 11, 11′) and one pressure chamber (12, 12′, 13, 13′) with a variable volume (V1, V2). The pressure chamber (12, 12′) of the primary V-pulley disk (5, 5′) can be connected to a primary chamber 20, 20′) of the cylinder (14, 14′), and the pressure chamber (13, 13′) can be connected with a secondary chamber (21, 21′) of said cylinder (14, 14′), in which, between the primary chamber (20, 20′) and the secondary chamber (21, 21′) a double action, reversible piston (15, 15′) is placed for directing pressurized oil from a low pressure side to a high pressure side of the variator (2, 2′) upon the shifting of said variator (2, 2′).