Vehicle seat for passenger motor vehicle

The invention relates to a vehicle seat for a passenger car according to the features of the preamble of claim 1.

JP 09109757 A shows a vehicle seat for commercial vehicles, comprising of an active seat suspension. In this seat are occurring at the seat accelerations in the vertical Direction compensated. For this purpose, the seat accelerometers which are attached to the seat and the vehicle, and a control device which from the signals of the acceleration sensors a compensation of the accelerations performs.

The present invention is based on the object, a to provide a vehicle seat for a passenger car, the having an active seat suspension, the comfortable and has fine speed control. In particular, the Vehicle seat occupying little space.

This object is inventively achieved by a vehicle seat solved with the features of claim 1.

The vehicle seat has a movably mounted seat structure with a seat cushion on which to a swing frame a fixed vehicle seat structure is movably supported. The seat cushion is connected with a backrest. At opposite Ends of the swing frame is spring-damper couples arranged, each connected with an actuator are. The actuator controls the transmission behavior of him connected spring damper pair. The controlled degree of freedom , the active seat suspension on a travel sensor, which for receiving the relative position of swing frame and seat base serves. This way the sensor enables a particularly sensitive control of the seat cushion, as it has an absolute value the seating position in relation to the driver's cab indicates and thus a direct value for an oscillation amplitude of Seat cushion supplies. In particular, in this way and As offsets in the determination of the position of the seat structure or the seat cushion can be avoided.

The mounting of the seat structure or the seat cushion on a Oscillating frame, the two spring-damper having the pairs of is arranged opposite ends of the swing frame are, permits a particularly space-saving and in two Degrees of freedom movable bracket of the vehicle seat. As Degree of freedom is thereby a movement of the seat in the vertical Direction of the vehicle, the Z-axis referred to. On Another degree of freedom is a pitching motion of the seat, the seat by a certain degree of angle α about an Transverse axis of the vehicle tends.

In one embodiment, it is provided that the actuators as Damper of the spring-damper pairs are formed. Preferably , the actuators on a lifting cylinder as a pneumatic, hydraulic or electro-hydraulic lifting cylinder can be formed and thus a damper of the spring-damper pair can form. Thus, an additional Dampers are omitted, whereby an additional space Book.

In a passenger car, in particular, the installation space The amounts range. In one embodiment, so provided be that the actuators are arranged horizontally and a comprise deflecting, which in the actuator movement a associated linear vertical movement to control the actuator Spring-damper pair converts. As a result, that with a horizontal actuator is a degree of freedom in the vertical Direction is controllable and also the space in the vertical direction is minimal. Thus, along the Degree of freedom Z a huge range as vibration amplitude be exploited for the vehicle seat.

It can be provided that the actuators as a pneumatic or hydraulic actuators are formed and a pressure cylinder exhibit, which is preferably a lifting cylinder for controlling formed of the actuator associated spring-damper pair is.

In one embodiment it can be provided that the actuators designed as electric motors, synchronous motors, preferably are and as deflecting having an output shaft, associated with a lifting rod for controlling the actuator Spring-damper pair cooperates. Electric motors, preferably synchronous motors are relatively inexpensive to manufacture and easily controllable. Thus enable those actuators an inexpensive system which with a reasonable material and money in an economic active seat suspension allows.

For a good control of the active seat suspension is provided, that the swing frame each controlled degree of freedom at least one associated with the active seat suspension acceleration sensor for receiving the acceleration values having the seat structure. Since the seat structure comprising a Seat, a backrest and a seat frame this halter ends which forms a movable bearing assembly, a sensor for receiving a movement and / or acceleration and / or a path of the seat structure to a Component of this seat structure, preferably on the seat cushion or be arranged on the backrest.

It can also be provided that the seat substructure, the is fixed to the vehicle is formed, each controlled degree of freedom connected with the active seat suspension further acceleration sensor for receiving the acceleration values ​​of the vehicle-fixed Seat substructure is provided.

The formation of the active seat suspension with multiple Sensors, in particular the combination of distance sensors and Accelerometers, is a particularly sensitive and highly responsive regulation of the active seat suspension achieved be used as directly measured values can, and not, as in seat suspension systems, in which is only one type of sensor available, the other values ​​by computational methods have to be derived.

In one embodiment, it is provided that the active seat suspension each controlled degree of freedom each have a separate control circuit having. In particular, in the control device Compensation measures, preferably a decoupling network be provided, the inherent linkages between compensate for or offset the individual degrees of freedom. The separate design of the control circuits each degree of freedom it is possible that the signals of the sensors according to degrees of freedom separately, as an indication of the determination of a Control variable for triggering the active seat suspension, according one for each degree of freedom especially given Störübertragungsverhalten be used. As a result, on vehicle-related data or to fit specifically related data be received, because even for the vehicle or the seat an appropriate model can be designed, which each by degree of freedom, the corresponding characteristics of the vehicle or of the seat considered.

The aim of the scheme is a vibration-free sitting. That means, that the state variables of the seat to settle to zero are, and the draft Regulation concerning the optimal make disturbance response is. If the active seat suspension integrated into an overall vehicle dynamics control, then may under ergonomic aspects guiding the seat movement on prove advantageous setpoints what here is not considered in detail.

In one embodiment, it is provided that the active seat suspension having a Störübertragungsverhalten that from the Combination of a vibrating controller and a position controller results. In particular, it is provided that the control device the vibration controller as measured quantities, the acceleration values the first sensor and / or the second sensor supplies. The vibration controller then determines from the supplied Acceleration values ​​each associated rate values and its position values ​​by approximating Integration. This is an observer structure implemented the state control, with which calculates the actuating forces will.

Furthermore it can be provided that the control device the Position controller as a measure of the relative position of the values third sensor feeds. It can be a PID controller therefor as Position controller are used.

To even at large amplitudes of the vehicle or at large vibration amplitudes between vehicle and seat to make a comfortable seat active control, is provided that is above a definable variable Amplitude maximum value, the active seat suspension passive Seat suspension mimics. This allows that the vehicle seat from being exceeded a certain Amplitude value of the oscillation, the movement of the vehicle cab follows, so that the actuator forces occurring, as well as the required lifting paths of the vehicle seat in a practical Framework remain.

The invention is based on a closer shown in the drawings Embodiment hereinafter described.

Show it:<dl tsize="6"><dt>Fig. 1</dt><dd>a schematic side view of a passenger car seat with seat substructure and active seat suspension,</dd><dt>FIG. 2</dt><dd>the representation of a schematic structure regulator the active seat suspension.</dd></dl>

Figure 1 shows a schematic side view of a vehicle seat 1 of a passenger car. The vehicle seat 1 is in the Interior of a passenger vehicle arranged. In the figure, 1 schematically shows a steering wheel 14 and a dashboard 15 illustrated by means of which the orientation of the vehicle seat 1 is in the vehicle interior can be removed. The vehicle seat 1 has a seat cushion 11 and a seat cushion with the 11 a seat frame associated backrest 12. At the top End of the backrest a headrest 13 is arranged.

The seat cushion 11 is connected to a swing frame 21, in turn, via at least two spring-damper couples the respectively on the demand side and on the rear side of the oscillating frame 21 are arranged, with the chassis of the passenger car connected. On the opposite se Ends of the swing frame 21 arranged spring-damper couples 22, 23, the vehicle seat 1 in two degrees of freedom movable mounted on the fixed vehicle chassis. Degree of freedom is the movement of the vehicle seat linearly along called a vertical yaw axis of the vehicle, the Z-axis, and a further degree of freedom is a pitching or rolling movement around the vehicle transverse axis, called α.

Regardless of the embodiment shown in Figure 1 it is also possible for the seat by means of several spring-damper pairs particularly to store four spring-shock pairs, said seat then has a plurality of degrees of freedom, said in addition to the Z and α nor the vehicle's longitudinal axis X and / or the vehicle transverse axis Y and / or rotational movements about may include the vehicle's longitudinal axis.

Each of the illustrated in Figure 1 spring damper pairs 22,23 is connected to an actuator 24th The actuators 24 are thereby controlled by a control device 4 of the active seat suspension 2 and influence the transfer characteristic of the Actuator associated spring-damper pair 22,23. The actuators are designed as two-phase motors, the output shaft a 32 exhibit. The output shaft 32 is connected to a Cylinders 33, of the horizontal rotational movement the output shaft 32 in a vertical reciprocating motion to control the oscillating frame 21 and thus of the vehicle seat, or converts the seat cushion 11th The engines driven by the control device 4 so that they are current-controlled are or force-controlled operable. Of the Force command value is from the control device 4 of the active Seating arrangements 2 generated and as an additive alternating force parallel to the passive suspension on the swing frame 21 initiated.

As motors and linear motors can alternatively used be with their driving force via a deflecting in deflected a stroke for controlling the vehicle seat becomes.

The passive suspension of the vehicle seat 1 is carried out as in the illustrated construction on two or four springs, with the support of the base load of the seat and occupant takes place. Thus, the vehicle seat is static in the rest position, what the power consumption and thus the installation space and energy consumption the actuators of the active seat control 2 minimized.

The springs 22 are designed as springs with progressive characteristic and so act a breakdown of the suspension in high seating amplitudes contrary. Similarly, the springs 22 are so dimensioned such that the seat suspension on failure of the electric actuators 24 has a natural frequency has the the a conventional seat suspension corresponds to, so in a passenger cars usual range of 2 Hz to 6 Hz, preferably 4 Hz.

To the control device 4 or the active seat suspension 2, transmit necessary information about existing disturbances to be able to, the vehicle seat 1 and the active Seating arrangements 2 more sensors. The controlled degree of freedom are provided separate sensors. A first fixed to the vehicle acceleration sensor 25a, b is with the chassis of the vehicle. A second acceleration sensor 26a, b is connected to the seat cushion 11 and firmly connected to the oscillating frame 21 and thus takes the Acceleration of the seat cushion 11 or indirectly the acceleration values ​​of on the seat cushion 11 seated rider on. A third sensor is between the seat cushion 11 or swing frame 21 and the vehicle chassis arranged in the region of the actuators 24 and is provided as a travel sensor 27a, b formed between the relative position Swing frame 21 and the chassis receives. are In the figure 1 the sensors represented by degree of freedom separately, and for the degree of freedom in front designated by the subscript a and for the degree of freedom back designated by the index b.

The output signals of the sensors 25,26 and 27 are each summarized and lead to corresponding signal lines 46a or 46b from the sensors to the control device 4. In the regulator device 4, the measured variables are "Front" and "back" by a transformation into corresponding Measures of controlled degrees of freedom z and α converted. The actuating forces for the front or back of the seat disposed actuators are controlled by a corresponding inverse transformation determined.

The control device 4 of the active seat suspension 2 has a internal structure, the regulated for each degree of freedom a separate controller structure that is identical provides. Each of these control structures identically constructed or 43a 43b consists of a combination of two different Controller types.

2 shows the structure of this controller structure 43 is schematically shown. The structure consists of a combination a vibration controller 41 with a position controller 42. With this control structure, it is possible, large relative movements suppressing between the cabin and the vehicle seat by low-frequency vibrations with large amplitude of vibration are transferred largely from the chassis on the seat. The position controller 42 effected thereby transferring low-frequency oscillations. The vibration controller 41 has a state controller structure, and serves to suppress the higher frequency vibrations. The delimitation of the respective Effect of the controller, which engage parallel in their structure, is this the used by suitable filtering Measurements made. Here this controller structure helps in, large relative movements with good possible To avoid vibration suppression.

As input variables is given to the acceleration of A seat structure available, which as input quantities, the vibration controller 41 serve to minimize vibration exposure. On the other hand, the part of the actuators available stationary relative movements between the seat structure and chassis used, and the position controller 42 is supplied as measured variables.

Since in the vibration controller 41 in addition to the measured acceleration in addition internally, the speeds and positions are fed, also these state variables from the measured acceleration signal by approximating integration to generate. Since in practice always offset in the are signals present, the acceleration signals also filtered through a high pass.

The position controller 42 is used as an input variable, the relative position between the seat and the vehicle chassis structure. Theoretically, it would be sufficient, only this relative position due. The other variables can then in the controller 42 by differentiation or integration of of this size are obtained.

The same structure of the controller structure shown is on to use the tilting degree of freedom α, by then in the figure 2 degrees of freedom Z by the degree of freedom replaces α becomes. be it through an inverse transformation for the rear and front actuator determines necessary actuating forces, which are necessary to the degrees of freedom Z and for α regulate. The output 45 of the control device will be under Consideration of the characteristic of the electric actuator as Force determining output via the output line 45a or 45b by the control device on where the actuator 24th

In addition, provided in the control apparatus 4, the Man / seat system of the respective vehicle seat considered. For this purpose, the control device 4 models integrated, the dynamic behavior of the seat and occupant account. This enables the objective of the scheme, vibration-free seats largely to achieve.