Abstract: A steering system for motor vehicles, has a steering handle, for example steering handwheel, capable of being operated by the driver. A steering actuating drive provides for the steering adjustment of steerable vehicle wheels. A steering-angle desired-value encoder is capable of being operated by the steering handle, and a steering-angle actual-value encoder operates via the steerable vehicle wheels. A regulating and control arrangement operates the steering actuating drive as a function of a comparison of the desired and actual values of the steering angle. The risk of a collision between a vehicle equipped with the steering system and an obstacle is reduced, and the steering system is suitable for steer-by-wire operation by equipping the steering system with collision prevention apparatus which determine steering angles (collision steering angles) making a collision possible between the motor vehicle and an obstacle.

Abstract: A hydraulic power steering system for motor vehicles which is suitable for a steer-by-wire operation, having a steering handle which can be operated by a driver. A servo motor operates steered vehicle wheels. A servo valve operates the servo motor and is constructed as a rotary slide valve arrangement having mutually rotationally movable control parts which, together, are pushed by a spring system into a normal position relative to one another. An actuator is coupled with the control parts for their rotational adjustment relative to one another and operates the servo valve. A desired steering angle value generator is operated by way of the manual steering handle. An actual steering angle value generator is operated by way of the steered vehicle wheels. An automatic control circuit operates the actuator as a function of a comparison of the desired and actual steering angles.

Abstract: A steering system for vehicles can be operated in a normal mode, in which a steering handle actuated by the driver and steered vehicle wheels are connected to one another via a control system, and in an emergency mode, in which the steering handle and the steered vehicle wheels are positively coupled. To achieve a steering system which increases the operational reliability of the steering system by simple design measures, a steering-angle control unit for a steering-angle actuator actuates the steered vehicle wheels. The control unit contains a first steering-angle control system, and a manual-torque control unit for a manual-torque actuator actuates the steering handle for the purpose of simulating manual torques. The control unit also contains a first manual-torque control system, and the steering-angle control unit comprises a second manual-torque control system, which is connected redundantly with the first manual-torque control system of the manual-torque control unit.

Abstract: In order to allow a traffic-lane following device in a vehicle to be used at relatively high vehicle speeds, a steering system is provided with a steering handle and a steering run which couples the steering handle to vehicle steered wheels. A servomotor is coupled to the steering run. A servovalve is arranged in the steering run and has a first control part (which is associated with a section on the steering handle side of the steering run) as well as a second control part (which is associated with a section on the vehicle steered wheel side of the steering run) to operate the servomotor as a function of relative movements between the control parts. An actuating drive is coupled to the section on the steering handle side of the steering run and is used to produce a steering force. A regulating and control arrangement uses a sensor system to determine required steering angle values which allow a traffic lane to be followed and uses a steering angle sensor to determine actual steering angle values.

Abstract: A steering system of a non-tracked motor vehicle has steered vehicle wheels are connected in normal operation with respect to the effect with a steering handle only by way of an electronic automatic control unit which continuously monitors itself with respect to a correct operation. As a function of a desired-value generator, which is operated by the steering handle, this automatic control system operates an adjusting drive for the steering adjustment of the steered vehicle wheels. In the event of a malfunctioning of the automatic control system, a forced coupling is automatically switched effective between the steering handle and the steered vehicle wheels. This also takes place if the performance limit of the adjusting drive is reached so that the driver is capable of assisting the adjusting drive by the driver's manual force on the steering handle.

Abstract: High functional reliability for a vehicle steering system that can be switched between a normal mode with a steer-by-wire level and an emergency mode with a fall-back level is achieved by providing that the fall-back level has a hydraulic system which contains a manual-side double-acting piston-cylinder unit which is actuated with a steering handle, e.g. steering wheel. The unit is positively coupled hydraulically to a wheel-side double-acting piston-cylinder unit which actuates steered vehicle wheels. A hydraulic charging system has a hydraulic pump, the inlet side of which is connected to a hydraulic-fluid reservoir. Switchable hydraulic couplings are provided for hydraulically coupling and decoupling the hydraulic system of the fall-back level and the hydraulic charging system to and from one another, respectively.

Abstract: A steering system of a non-track-bound motor vehicle having steered vehicle wheels which are operatively connected to a steering handle in normal operation only via an electronic regulating arrangement which checks itself continuously for correct operation. In a manner dependent on a desired-value transmitter actuated by the steering handle and on an actual-value transmitter actuated by way of the vehicle wheels, this regulating arrangement actuates an actuating drive for the steering displacement of the steered vehicle wheels. If the regulating arrangement malfunctions, a positive coupling between the steering handle and the steered vehicle wheels is automatically activated. This also occurs if a characteristic variable correlated with the desired/actual value deviation of the steering angle is outside tolerance thresholds.

Abstract: A steering system for a motor vehicle is not trackbound and has steered vehicle wheels which are connected only operationally in normal operation to a steering handwheel via an electronic control arrangement which actuates a steering actuator in accordance with a desired-value stipulation by way of the steering handwheel. In emergencies, a mechanical positive coupling becomes effective between the steering handwheel and the steered vehicle wheels. The operational state of the clutch is monitored by a sensor system in the case of normal operation, with the result that the normal operation can remain switched on only if the clutch is unambiguously open.

Abstract: In a steering system for a motor vehicle, the steered vehicle wheels, during normal operation, are coupled with a steering handle only through an electronic regulating system that constantly checks for correct function. The regulating system controls an actuator for the steering adjustment of the steered vehicle wheels in response to a signal from a set value transmitter which is actuated by the steering handle. During abnormal operation, a mechanical or hydraulic forced coupling is introduced between the steering handle and the steered vehicle wheels. At the same time the actuator and/or a manual force adjuster associated with the steering handle operate as a servo motor.

Abstract: A steering system of a non-tracked motor vehicle whose steered vehicle wheels are connected in the normal operation with respect to the effect with a steering handle only by way of an electronic automatic control unit which continuously monitors itself with respect to a correct operation. As a function of a desired-value generator, which is operated by the steering handle, and an actual-value generator operated by the vehicle wheels, this automatic control system operates an adjusting drive for the steering adjustment of the steered vehicle wheels. In the event of a malfunctioning of the automatic control system, a forced coupling is automatically switched effective between the steering handle and the steered vehicle wheels. When the forced coupling is switched on, the steering system operates as much as possible in the manner of a conventional power steering system.

Abstract: A vehicle steering system has a steering handle as well as steered vehicle wheels connected with one another with respect to the effect at least in the normal operation only by way of a control device ("steer by wire") which compares the signals of a steering angle actual value generator operated by the vehicle wheels and of a steering angle desired value generator operated by the handle. The control device controls a motor used as a manual force adjuster which is coupled with the handle by way of a torsionally elastic shaft arrangement. The extent of the torsionally elastic deformation is analyzed for determining the actual value of the manual force.

Abstract: In a hydraulic power steering for a motor vehicle including a steering control element, a position setting means connected to the steering control element to be operated thereby, a control motor connected to the position setting means by way of a control circuit and a servo valve having control parts interconnected by a torsion bar so as to be retained in a predetermined position relative to each other, a hydraulic servo motor is operatively connected to the steered wheels of the motor vehicle and in communication with the servo valve such that hydraulic fluid is supplied to the hydraulic servo motor depending on the relative position of the control parts of the servo valve.

Abstract: A vehicle steering system is provided with a manually operable steering member and a hydraulically operated steering actuator unit operable to control the steering movements of at least one vehicle wheel in response to movement of the steering member. Steering forces are transmitted between the steering member and actuator unit by a pair of selectively engageable independent hydraulic circuits. A safety valve arrangement is operable to switch operation between the two circuits.

Abstract: A vehicle steering system that senses forces acting upon steered vehicle wheels to enable a control device to record introductions of disturbance variables from the road through the steered vehicle wheels without any time delay, and examine its plausibility by means of other input quantities. This permits a multi-redundant system, where the redundant signals or the redundant information determined from the signals originate from differently structured and arranged sensors. There is also the advantageous possibility that, as a function of forces active on the steered vehicles wheels, the control device controls or influences a manual force actuator without delay. This has the purpose of simulating or modulating, as a function of the respective driving conditions, an actuating force on the manual steering device or on the manual steering wheel which can be felt by the driver.

Abstract: An emergency backup steering system for a wheeled vehicle controls steering of the vehicle upon failure of the primary vehicle steering system, by unequal braking of wheels on opposite sides of the vehicle.

Abstract: A power steering system for automobiles has a mechanical drive connection between a steering device and a steering gear arrangement for steering of vehicle wheels. The drive connection can be separated by opening a connection. In that event, the steering device is connected to the steering gear arrangement only indirectly, in that only nominal values for the steering angle of the wheels steering the vehicle are specified as a function of the adjusting travel of and/or the adjusting speed of the steering device, and the servo motor is actuated by a separate control valve arrangement.

Abstract: In a hydraulically operated steering for a motor vehicle comprising a control motor with first and second double acting piston and cylinder units arranged in axial alignment and a single piston rod extending through the first and second double acting piston and cylinder units, at least one of the double acting piston and cylinder units includes an annular piston which is fastened on the pistons rod in a predetermined axial position and an annular divider wall is disposed between the pistons for slidably supporting the piston rod and separating the cylinders of said first and second double acting piston and cylinder units fluidically from one another so as to form cylinder chambers for said pistons limited at one side by an annular divider wall and by guide sleeve members disposed in the opposite ends of the cylinder units.

Abstract: In a steering system for the steered wheels of a vehicle having a steering device such as a steering wheel, a desired wheel angle position transmitter operatively connected to the steering device, a motorized actuating unit for steering the steered vehicle wheels, and a hand force controller operatively connected to the steering device for generating a steering device return force to be felt by a vehicle operator, the energization of the hand force controller is dependent on the sum of a first signal which depends on the actual position of the steering device and the vehicle speed and a second signal which depends on the rate of actuation of the steering device and the vehicle speed.

Abstract: A vehicle steering system has a desired-value generator arrangement which is actuated by a manual steering device. The desired-value generator arrangement is connected with a hydraulic actuating unit for the steered vehicle wheels by a regulating system. A modified PD control, along with taking a control segment into account, provides a precise operation of the actuating unit analogously to the operation of the manual steering device.

Abstract: A motor vehicle steering apparatus contains a user-operated steering angle input system with corresponding steering shaft as well as a piston-and-cylinder unit for coupling a steering angle setting system to the steering angle input system. The hydraulic unit comprises a piston-and-cylinder unit which is disposed with its longitudinal axis running transversely of the steering shaft, and its axially moving piston is coupled mechanically with the rotatory steering shaft and divides the cylinder into two working chambers. The two cylinder halves forming working chambers are disposed on opposite sides of the steering shaft. The piston is configured as a dual piston and is coupled to the steering shaft by a coupling section lying between its ends defining the working chambers. Thereby, a steering apparatus with a compact hydraulic coupling between the steering angle input system and the steering angle setting system is provided, with the ability to rotate the steering angle input system.