Abstract:
A braking system may include a brake booster, the piston-cylinder system of which is driven by an electric motor, wherein at least one working chamber of the piston-cylinder system is connected by hydraulic lines to at least two wheel brakes, a wheel brake being allocated a 2/2-way switching valve in each case and the hydraulic connection lines between the wheel brakes and the piston-cylinder system being closable, optionally separately or jointly, by means of the 2/2-way switching valves, so that a pressure can be adjusted in the wheel brakes one after the other in terms of a multiplex method and/or simultaneously. The electric motor and switching valves may be activated by a control device configured to adjust or control the piston movement and piston speed during the pressure generation and pressure reduction as a function of the pressure-volume characteristic of the wheel brakes.
Abstract:
A brake system may include a brake booster, the piston-cylinder system of which is driven mechanically or hydraulically by an electric motor, in particular by means of transmission means, at least one working chamber of the piston-cylinder system being connected to at least two wheel brakes via hydraulic lines, each wheel brake being associated with a 2/2 distribution control valve and the hydraulic connecting lines between the wheels brakes and the piston-cylinder system being selectively disconnectable or jointly closable by means of the 2/2 distribution control valves such that in the wheel brakes a pressure can be adjusted consecutively in terms of a multiplex method and/or simultaneously, the electric motor and the control valves being actuated by a regulating device, characterized in that the regulating device calculates the respective pressure in the wheel brakes by means of a pressure model and transmits the calculated pressure values to at least one ABS-ESP regulator and to a pressure regulating device, wherein the pressure regulating device actuates at least the 2/2 distribution control valves and the electric motor, and a prioritization device performs a wheel selection on the basis of the data transmitted by the ABS/ESP regulator and transmits it to the pressure regulating device.
Abstract:
The invention relates to an on-board power system for a motor vehicle. A central electronic system housed in a box is accommodated close to the engine compartment bulkhead and connecting cables from the engine compartment to the electrical connectors on this box do not pass through the bulkhead.
Abstract:
The invention relates to an electronic control unit for a motor vehicle with a plurality of data networks and an electronic immobilizer. The control unit according to the invention is configured both as a vehicle-end control section for the electronic immobilizer and as a gateway between at least two of the data networks. At least one component of the gateway also serves as a component of the vehicle-end control section for the electronic immobilizer. Preferably, there is common use of components of the gateway for the immobilizer function such that, in addition to the normal vehicle-end immobilizer control section, a further, redundant vehicle-end immobilizer control section, is formed, which significantly reduces the failure rate of the immobilizer.
Abstract:
A system for controlling actuating members in the doors of motor vehicles has at least one electromotive actuating drive and at least one actuating element (switch, button) in the door of the motor vehicle, as well as a control unit located in the vehicle itself. The system employs only a two-wire connection between control unit and actuating drive. The control unit, in addition to an ordinary pole-reversing and evaluation circuit, furthermore contains a source of alternating voltage as well as means for connecting the alternating voltage and a decoder. At least two passive components (resistor, capacitor, coil) of different size are provided to be connected by the actuating element in parallel with the actuating drive into the two-wire connection.
Abstract:
A motor vehicle light controlling device includes an operating switch and electronics assigned to the operating switch for supplying current to a multiplicity of lamps of the operating light system. At least one controlled switching component provides a clock-controlled supply of current to the assigned lamp circuit. The device is divided into a light switch module and a rear lamp module. A clock control provided, distributed over both modules, in order to influence the lamp currents of the vehicle operating lights. That is, in order to lower the luminosity of certain lights when required, and to be able to increase the on-board system voltage temporarily without the luminosity or lamp power changing as a result. The latter is of interest, for example, for the brief driving of electrical heating elements or servomotors to achieve an advantageously high utilization of conductor material. Lamps for driving light can be dimmed when the vehicles stationary to a luminosity corresponding to the customary parking light. Or, in the event of failure of a lamp or of a circuit for driving light, the corresponding headlamp can be supplied with current clock-controlled for lower light power for an emergency driving light function.
Abstract:
A hydraulic dual-circuit brake system has brake booster with a first output pressure chamber allocated to the front-axle brake circuit I and a second output pressure chamber allocated to the rear-axle brake circuit II. The chambers are movably delimited by master cylinder pistons, to each of which is allocated a position sensor. An electronic control device is provided to process the output signals of the position sensors and to emit control signals for a valve arrangement by which a brake circuit which is poorly bled or leaking is blocked off from its master brake line. The electronic control device includes a comparator, which compares the positions, represented by the two output signals of the positions, represented by the two output signals of the position sensors, of the pistons of the brake booster to one another and produces a signal for the purpose of driving the valve arrangement into its blocking position as soon as the positions of the brake booster piston allocated to the front-axle brake circuit corresponds to a stroke which is greater by more than a threshold value .DELTA.Smax than the stroke of the brake booster piston represented by the position-indicating signal of the brake booster piston allocated to the rear-axle brake circuit. The electronic control device allows this signal to decay again when the difference of the piston strokes falls below a smaller threshold value .DELTA.Smin.
Abstract:
A hydraulic dual-circuit brake system for a road vehicle with front-axle/rear-axle brake circuit division has a tandem main cylinder as a brake device. The primary output pressure space of the cylinders is associated with the front-axle brake circuit, and the secondary output pressure space of the cylinders is associated with the rear-axle brake circuit. A pressure modulator adjusts the front-axle/rear-axle braking force distribution in the direction of an approach to the, in each case, ideal braking force distribution, as a braking-pressure actuator for the rear-axle brake circuit. The pressure modulator has a drive pressure space, by the charging of which with the output pressure of an auxiliary pressure source under solenoid valve control, a braking pressure which can be coupled into the rear-wheel brakes can be built up in an output pressure space of the pressure modulator. This output pressure space is also connected to the output pressure space of the brake device provided for the rear-axle brake circuit. During normal braking action, the output pressure space of the pressure modulator is blocked off against the output pressure space of the brake device, and the pressure build-up in the rear-axle brake circuit is exclusively effected by the pressure modulator which is driven in the direction of a servo control for which a set point P.sub.s correlated with the braking pressure in the front-axle circuit as ideal or almost ideal value is utilized as a reference variable.
Abstract:
A twin master cylinder for a road vehicle brake system has master cylinders assigned respectively, to a front-axle brake circuit and to a rear-axle brake circuit. The master cylinders are arranged laterally next to one another in a common housing and are each actuable via an arm of a pivotable rocker with a variable ratio L1/L2 of the lengths L1 and L2 of arms of the rocker. A supporting element is provided which, by its support point on the pivotable rocker, marks the pivot axis of the rocker and, by support on a push-rod piece, transmits the actuating force acting on piece to the rocker. The supporting element is arranged between the rocker and the supporting surface of the push-rod so as to be displaceable transversely relative to the direction of exertion of the actuating force. A hydraulic drive cylinder serving as an automatic actuating drive coupled to the supporting element via a link and, when subjected to the front-axle brake pressure, causes the link and consequently the supporting element to experience lateral deflection which change the ratio L1/L2 of the lengths of the rocker arms.
Abstract:
A hydraulic telescopic shock absorber wherein damping characteristic can be varied by means of an electromagnetic valve arrangement, the coil of which is accommodated so as to be protected against the hydraulic medium of the shock absorber. The control preferably takes place as a function of the pressure difference between the spaces above and below the piston of the shock absorber.