motor vehicle

Abstract

A motor vehicle (1), in particular a passenger car, with a body (2), a chassis (3) on which the body (2) is supported, and means for actively influencing the roll behavior of the body (2), is characterized by a sensor device (4) for detecting the state of at least one door (5) of the body (2) and by a control device (6) which is operable to initiate a measure influencing the roll behavior of the body (2) depending on the state of the at least one door (5).

Description

[0001] The invention relates to a motor vehicle, in particular a passenger car, having a body, a chassis on which the body is supported, and means for actively influencing a rolling behavior of the body according to the preamble of claim 1. Furthermore, the invention relates to a method for influencing the rolling behavior of a body of a motor vehicle according to the preamble of claim 10.

[0002] Passenger cars whose bodies are supported on a so-called active chassis are generally known from the state of the art. In the broad sense, this refers to a chassis that allows active intervention in the chassis tuning. To increase vehicle stability and driving comfort, it is also known to equip motor vehicles with means for actively influencing the body's roll behavior. Rolling movements of the body caused by cornering and / or uneven road surfaces while the vehicle is moving can thus be reduced or even eliminated. For this purpose, the vehicle is equipped, for example, with so-called active roll stabilizers on the front and / or rear axle. For example, reference is made to DE 10 2022 101 770 A1, which relates to an active roll stabilizer for a motor vehicle.In addition or as an alternative, other active chassis systems such as air suspension or adaptive dampers exist as a means of actively influencing the body's roll behavior. These systems are used primarily while the vehicle is moving.

[0003] DE 10 2022 202 644 A1 discloses a motor vehicle having features of the preamble of claim 1. Reference is also made to DE 690 30 412 T2, DE 10 2016 110 854 A1, US 2020 / 0 346 507 A1, DE 10 2014 000 050 A1 and DE 10 2019 124 629 A1 as prior art documents in the field of the invention.

[0004] It is an object of the present invention to provide a motor vehicle according to the features of the preamble of claim 1, which offers increased comfort when entering or exiting the vehicle, particularly when closing a door, while being safer to handle. In addition, a corresponding method is to be provided.

[0005] The object is initially achieved by a motor vehicle according to the features of claim 1. This is a motor vehicle, in particular a passenger car, with a body, a chassis on which the body is supported, and means for actively influencing the roll behavior of the body. According to the invention, the motor vehicle is characterized by a sensor device for detecting the state of at least one door of the body and by a control device that is operable to initiate a measure influencing the roll behavior of the body depending on the state of the at least one door and to determine the measure influencing the roll behavior taking into account the position of a roll axis of the vehicle and the position of a force application point of the door.

[0006] The invention described is based on the observation that when a vehicle door is slammed, the motor vehicle can briefly oscillate around the so-called roll axis due to the impulse introduced by the door impact. The roll axis of a vehicle is the (imaginary) connecting line between the roll centers of the front and rear axles. Particularly due to the increasing use of motor vehicles with a higher center of gravity, the force application point of the vehicle doors can, for example, have a greater vertical distance from the roll axis, which disadvantageously increases the roll excitation when the vehicle door is slammed. For any occupants still sitting in the vehicle, such an effect can adversely affect the seating comfort. In general, rolling triggered by a door impact makes the vehicle appear less stable.In the worst case, such a swaying movement can even cause damage, for example if the vehicle is parked closely together.

[0007] Based on the observation described, the idea of ​​advantageously using existing means for actively influencing the roll behavior of the body was developed according to the invention. For this purpose, a sensor device is initially used which detects the state of at least one door of the body, wherein a control device is also used which is operable to initiate a measure influencing the roll behavior of the body depending on the state of the at least one door. For this purpose, the sensor device is expediently signal-coupled to the control device, and furthermore the control device is expediently coupled to the means for actively influencing the roll behavior. The motor vehicle according to the invention thus described thus automatically detects whether a door is slammed or opened and initiates a measure influencing the roll behavior.

[0008] Advantageously, the initiated measure aims to counteract a rolling motion of the body caused by the movement of the door, in particular its slamming or opening. In particular, this is achieved by appropriately controlling the means for actively influencing the rolling behavior. The control device will expediently control the active chassis in such a way that the roll stiffness of the body is increased and / or that the roll tendency of the body caused by the slamming of the door is reduced. According to one possible embodiment, it is conceivable that the vehicle is braced diagonally, for example, by means of active roll stabilizers, thereby increasing its roll stiffness.In the context of the present invention, diagonal bracing is understood to mean an opposing influence on the roll behavior on the front and rear axles of the motor vehicle, in particular by actuating an active roll stabilizer on the front axle in the opposite direction to an active roll stabilizer on the rear axle (by opposite drive of the associated actuators).

[0009] Different types of sensors can be used as a sensor device for detecting the state of at least one door of the body. According to a preferred development of the motor vehicle, the sensor device comprises at least one camera, preferably an exterior camera, particularly preferably a blind spot camera, to detect the state of the door. Since motor vehicles are increasingly equipped with so-called blind spot cameras for other reasons as well, such a camera could be advantageously used for the aforementioned purpose without additional effort.

[0010] Alternatively or additionally, other door sensors can also be used to detect an open or closed door, or to detect a door closing process. The sensor device therefore advantageously comprises a position sensor and / or angle sensor for detecting the state of the at least one door. In general, it should be noted that the term "state of the at least one door" is not only to be understood as a static state ("door closed" or "door open"), but rather also, in dynamic terms, a state of movement (angular velocity of the door), from which the time and / or strength of the expected impulse when the door slams shut can be deduced. This also allows the countermeasure to be initiated by the control device to be appropriately coordinated.

[0011] As already mentioned, the means for actively influencing the body's roll behavior can include an actively adjustable roll stabilizer. An actively adjustable roll stabilizer is particularly suitable for actively influencing the body's roll behavior, even when the vehicle is stationary.

[0012] Particularly advantageously, the means for actively influencing the body's roll behavior comprise actively adjustable roll stabilizers on the front and rear axles of the vehicle. Equipping the vehicle in this way offers the advantage that the body's roll behavior can be influenced on both the front and rear axles. By controlling the roll stabilizers in the same direction, the control device can reduce the body's tendency to roll caused by a door slamming; by controlling them in opposite directions, the control device can increase the body's roll stiffness.

[0013] Alternatively or additionally, the means for actively influencing the rolling behavior of the body may comprise a chassis with actively adjustable suspension, in particular air suspension.

[0014] Furthermore, alternatively or additionally, the means for actively influencing the rolling behavior of the body can comprise a chassis with adaptive damping, in particular through the use of damping elements with adjustable damping characteristics.

[0015] To initiate the most suitable countermeasure, the control device is operable according to the invention to determine the measure influencing the roll behavior by taking into account the position of a roll axis of the vehicle and the position of a force application point of the door. Depending on whether the force application point of the door is above or below the roll axis, the control device determines whether the corresponding vehicle side or corner at which the door is slammed should be raised or lowered. If, for example, the force application point is below the roll axis, the corresponding vehicle corner should be raised to reduce the vertical distance to the roll axis, which ultimately leads to a lower roll tendency when the door is slammed.

[0016] The described functionality can, in principle, be useful in various operating states of the vehicle. According to a preferred development of the vehicle, the status detection and initiation of the roll control measure can be activated or are automatically activated when the vehicle is stationary. This is especially true when people are getting in or out of the vehicle while the vehicle is stationary, and driving-related influences on the roll behavior can be excluded when the vehicle is stationary.

[0017] The object mentioned at the outset is further achieved by a method according to the features of claim 10. This is a method for influencing the roll behavior of a body of a motor vehicle, in particular a motor vehicle of the type described above. According to the invention, the method is characterized in that the state of at least one door of the body is detected by sensors and that, depending on the state of the at least one door, a measure influencing the roll behavior of the body is initiated, wherein the measure influencing the roll behavior is determined taking into account the position of a roll axis of the vehicle and the position of a force application point of the door.

[0018] An advantageous development of the method provides for the measure influencing the body's roll behavior to be initiated in advance, particularly before the door imparts an impulse to the body upon reaching an end stop. In particular, a preparatory increase in roll stiffness can be considered a useful measure to reduce the effect of an expected impulse on the body caused by the slamming of a door.

[0019] The invention is explained and described in more detail below with reference to the accompanying drawings. Further advantageous effects of the inventions are also apparent from these drawings. The drawing shows the only Figure of a motor vehicle in the form of a passenger car in a schematic perspective view from the front.

[0020] The single figure shows a simplified schematic representation of a motor vehicle 1 in the form of a passenger car, viewed diagonally from the front. For orientation, a longitudinal axis X, a transverse axis Y, and a vertical axis Z are drawn as reference lines. A body 2 of the motor vehicle 1 has several doors on the sides of the body 2 to allow persons (occupants) to enter or exit the vehicle. For simplicity, only door 5 is designated by a reference numeral; this door 5 is pivotally connected to the body 2 via a door hinge in a manner known per se.

[0021] The body 2 is supported on a chassis 3 (not shown in detail but simply indicated by arrows). This is an active chassis, which in this case is equipped at least with means for actively influencing the roll behavior of the body 2. In the case of the motor vehicle 1 shown, adjustable roll stabilizers 7 are provided on a front axle 8 of the motor vehicle 1 and on a rear axle 9 of the motor vehicle 1, with which the roll behavior of the body 2 can be influenced in a manner known per se. Alternatively or additionally, the motor vehicle 1 can be equipped with an actively adjustable suspension, in particular air suspension, and / or with a chassis with adaptive damping.

[0022] A roll axis 10 runs through a roll center 12 on the front axle 8 and through a roll center 13 on the rear axle 9.

[0023] When the door 5 slams shut—for example, after entering or exiting the vehicle—the door 5, upon reaching its end position (shown state, "closed door"), imparts an impulse to the body 2. This impulse is essentially directed in the direction of the vehicle's transverse axis Y and is concentrated at the force application point 11. Depending on whether this force application point 11 is located vertically above or vertically below the roll axis 10, the impulse from the slamming of the door 5 conventionally causes a rolling motion of the body 2 about the roll axis 10.

[0024] In the case of the illustrated motor vehicle 1 according to the invention, a sensor device 4 is provided on the door 5, with which the state of the door 5 can be detected. The sensor device 4 is preferably a blind spot camera (not shown in detail here), which is integrated, for example, into the left exterior mirror. Alternatively or additionally, the sensor device 4 can comprise a position sensor and / or an angle sensor for detecting the state of the door 5.

[0025] Furthermore, the motor vehicle is equipped with a control device 6, which can be operated to initiate a measure influencing the roll behavior of the body 2 depending on the state of the door 5. Specifically, this measure aims to counteract a roll movement of the body 2 caused by the movement of the door 5. This is achieved in particular by activating the actively adjustable roll stabilizers 7 on the front axle 8 and rear axle 9 by means of the control device 6 when the slamming of the door 5 is detected. By controlling the roll stabilizers 7 on the front axle and rear axle 9, for example, a diagonal bracing of the front axle and rear axle can occur, thereby increasing the roll rigidity of the body 2. Alternatively or additionally, the adjustable roll stabilizers 7 can be used to reduce the roll tendency of the body 2. Reference symbol 1 motor vehicle 2 Body 3 Chassis 4 Sensor device 5 Door 6 Control device 7 actively adjustable roll stabilizer 8 front axle 9 Rear axle 10 Roll axis 11 Force application point (door) 12 Roll center front axle 13 Rear axle roll center X Vehicle longitudinal axis Y vehicle transverse axis Z Vehicle vertical axis

Claims

[1] Motor vehicle (1), in particular passenger car, with a body (2), a chassis (3) on which the body (2) is supported, and means for actively influencing a rolling behaviour of the body (2), characterized by a sensor device (4) for detecting the state of at least one door (5) of the body (2) and by a control device (6) which is operable to initiate a measure influencing the rolling behavior of the body (2) depending on the state of the at least one door (5) and to determine the measure influencing the rolling behavior taking into account the position of a roll axis (10) of the vehicle (1) and the position of a force application point (11) of the door (5). [2] Motor vehicle according to claim 1, characterized by that the measure aims to counteract a rolling movement of the body (2) caused by the movement of the door (5), in particular its slamming or opening. [3] Motor vehicle according to claim 1 or 2, characterized by that the sensor device (4) comprises at least one camera, preferably an external camera, particularly preferably a blind spot camera, for detecting the state of the at least one door (5). [4] Motor vehicle according to one of the preceding claims, characterized by that the sensor device (4) comprises a position sensor and / or angle sensor for detecting the state of the at least one door (5). [5] Motor vehicle according to one of the preceding claims, characterized by that the means for actively influencing the rolling behavior of the body (2) comprise an actively adjustable roll stabilizer (7). [6] Motor vehicle according to one of the preceding claims, characterized by that the means for actively influencing the rolling behavior of the body (2) comprise actively adjustable roll stabilizers (7) on the front axle (8) and rear axle (9) of the motor vehicle (1). [7] Motor vehicle according to one of the preceding claims, characterized by that the means for actively influencing the rolling behavior of the body (2) comprise a chassis (3) with actively adjustable suspension, in particular air suspension. [8] Motor vehicle according to one of the preceding claims, characterized by that the means for actively influencing the rolling behavior of the body (2) comprise a chassis (3) with adaptive damping. [9] Motor vehicle according to one of the preceding claims, characterized by that the condition detection and the initiation of the roll control measure can be activated or are activated automatically when the motor vehicle (1) is stationary. [10] Method for influencing the rolling behavior of a body (2) of a motor vehicle (1), in particular a motor vehicle according to one of the preceding claims, characterized bythat the state of at least one door (5) of the body (2) is detected by sensors and, depending on the state of the at least one door (5), a measure influencing the rolling behavior of the body (2) is initiated, wherein the measure influencing the rolling behavior is determined taking into account the position of a roll axis (10) of the vehicle (1) and the position of a force application point (11) of the door (5). [11] Method according to claim 10, characterized by that the measure influencing the rolling behaviour of the body (2) is initiated in a preparatory manner, in particular before the door (5) applies an impulse to the body (2) upon reaching an end stop.

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