Chassis and motor vehicle

Abstract

Chassis (10) for a motor vehicle (100) comprising a hydraulic four-point height adjustment system (16), the four-point height adjustment system (200) comprising a fluid circuit (14), designed and configured to adjust the height of at least one front axle via a height adjustment of front wheels and the rear axle via a height adjustment of rear wheels, wherein at least one hydraulic throttle (20) is designed and arranged in a fluid circuit (14) for throttling a lowering behavior of a more heavily loaded axle, characterized in that the hydraulic throttle (20) has at least one selected from one of a throttle valve (22), which is designed and arranged to allow the volume flow to pass in the flow direction (60) and to throttle the volume flow in a throttling direction (50), or a throttle cone (23), which is designed and arranged,to allow a full volume flow to pass in the flow direction (60) and to throttle the volume flow in a throttling direction (50).

Description

[0001] The invention relates to a chassis. The invention relates to a motor vehicle.

[0002] It is known to adapt motor vehicle chassis to a specific driving situation, for example, by adjusting the height. Corresponding systems are known from CN 1 05 736 488 A, CN 1 02 390 231 A, and CN 1 02 320 228 A.

[0003] CN 1 05 736 488 A deals with a one-piece dual-function pump with a cylinder and a constant flow rate that adjusts the body position of the vehicle.The system consists of a fixed-displacement pump main pressure regulating valve group, load-sensing proportional throttle valve groups with dual function, a constant-displacement pump and a hydropneumatic suspension with the first left suspension, wherein the fixed-displacement pump main pressure regulating valve group and a load-sensing proportional throttle valve group with dual function of the cylinder are sequentially arranged in parallel between the constant-displacement pump and the first left hydropneumatic suspension, and the load pressure regulating end of a load-sensing proportional throttle group with dual function of the cylinder is connected to the control end of the fixed-displacement pump main pressure regulating valve group, so that the pressure of a system oil inlet path is always 0.6 MPa to 0.9 MPa higher than the boost pressure.An oil filling and draining port A and an oil filling and draining port B of a load-sensing proportional throttle group with dual function of the cylinder are connected to a main oil cavity and an annular cavity of the first left hydropneumatic suspension, respectively.

[0004] CN 1 02 390 231 A relates to a hydraulic and control method, in particular to a method for controlling tire load loading by a vehicle attitude adjustment system, characterized in that an adjustment system comprises a suspension, an oil tank, a hydraulic pump, a hydraulic control hold valve, a three-stage four-way proportional reserve valve, an adjustable throttle valve, oil cylinders and a two-stage two-way valve; a target height, a target speed and a target load percentage of a vehicle in normal running condition are preset, then the current vehicle height is detected, the detected current vehicle height is compared with the target vehicle height for analysis and treatment is carried out in an uphill situation, a downhill situation and a non-adjustable situation according to the comparison result of the detected current vehicle height and the target height.A controller is used to monitor the information of displacement and pressure of oil cylinders, so that the pressure of four suspended oil cylinders can be reasonably distributed, the appropriate distribution of tire load can be ensured during the vehicle posture adjustment process, and the problem that the tire load distribution is unreasonable due to the vehicle posture adjustment can be solved.

[0005] CN 1 02 320 228 A provides a method for adjusting a vehicle position by applying a descending method, which comprises the following steps: sending a vehicle position adjustment command to a vehicle position adjustment control unit, comparing and analyzing the current vehicle height with the target vehicle height, and judging whether the vehicle height should be adjusted according to an analysis result. When the current vehicle height is greater than the target vehicle height and the difference exceeds a set value, the vehicle height needs to be adjusted. When the current vehicle height is shorter than the target vehicle height and the difference exceeds a set value, the vehicle height needs to be adjusted, and at the moment, lift control adjustment is performed first, followed by descent control adjustment. The vehicle height does not need to be adjusted under other conditions.The proposed method scientifically uses a linear displacement sensor arranged inside or outside an oil cylinder or uses an angular displacement sensor correlated with a suspension frame to measure the change information of vehicle body height, and uses a position closed-loop control system to realize vehicle height adjustment, and dynamically adjusts the current of a proportional throttle valve through a control algorithm to control a vehicle body to descend slowly at a constant speed.

[0006] In known chassis, the height adjustment is considered to be in need of improvement.

[0007] The object of the invention is to improve the chassis adjustability.

[0008] The object is achieved in particular by a chassis having the features of claim 1. The object is achieved in particular by a motor vehicle having the features of claim 7. Further features and details of the invention emerge from the subclaims, the description, and the drawings. Features and details described in connection with the chassis also apply in connection with the motor vehicle. This also applies vice versa, so that with regard to the disclosure of the individual aspects of the invention, reference is always made to each other.

[0009] According to one aspect, the problem is solved in particular by a chassis having the features of claim 1.

[0010] The chassis is designed for a motor vehicle. It has a hydraulic four-point height adjustment system. The four-point height adjustment system has a fluid circuit. It is designed and configured to adjust the height of at least one front axle by adjusting the height of the front wheels and the rear axle by adjusting the height of the rear wheels, wherein at least one hydraulic throttle is designed and arranged in a fluid circuit to throttle the lowering behavior of a more heavily loaded axle. The hydraulic throttle has at least one selected from a throttle valve, which is designed and arranged to allow the volume flow to pass in the throughflow direction and to throttle the volume flow in a throttling direction, or a throttle cone, which is designed and arranged to allow a full volume flow to pass in the throughflow direction and to throttle the volume flow in a throttling direction.This prevents vehicles with a four-point height adjustment system, also known as ehPDCC and 4 Corner Lift System, from experiencing different lowering speeds between a more heavily loaded and a less heavily loaded axle due to different axle loads, cable lengths and diameters.

[0011] In one embodiment of a motor vehicle with a rear engine, for example, this can prevent the rear axle from lowering significantly faster than the front axle. Alternatively or additionally, a hissing noise that occurs during lowering can be prevented.

[0012] In embodiments, synchronization of the lowering and hissing noise avoidance can be achieved by the correspondingly described throttling in the lowering mode process.

[0013] In embodiments, the throttling can be arranged in particular in at least one distributor piece, in particular only on the supply lines of the loaded axle, for example the rear axle of a motor vehicle with a rear engine, as described.

[0014] Here, throttling can be understood in particular as a reduction of a volume flow from one part of a fluid circuit to another part, which can in particular reduce the lowering speed of the chassis at the points assigned to the more heavily loaded axle which are to be lowered.

[0015] As already mentioned, the more heavily loaded axle may be one that is subject to greater stress, particularly due to gravity. Alternatively or additionally, the design of the fluid circuit may also play a special role, for example, through the line lengths and / or line diameters, which can influence the distribution of pressurized fluid. It may be possible to provide a throttle that can at least partially compensate for these differences in the fluid circuit.

[0016] According to one aspect, the hydraulic throttle can comprise at least one selected from a throttle check valve, a throttle flap, or a throttle cone. This allows for throttling in one direction, for example, when the more heavily loaded axle is to be lowered.

[0017] According to one aspect, the hydraulic throttle can be arranged in a supply bore of the fluid line supplying the more heavily loaded axle. The supply bore can, for example, at least partially accommodate the throttle, wherein the supply bore can in particular be arranged in at least one distributor piece in order to be able to act in particular only on the supply lines of the more heavily loaded axle, for example the rear axle of a rear-engined motor vehicle, as described elsewhere herein. In this case, an asymmetrical structure of the fluid circuit can therefore be provided, which can take into account the various cases in the motor vehicle, such as weight distribution, the design of the fluid dynamics through the dimensioning of the fluid circuit, and possibly other conditions in the design or operation of a motor vehicle with a corresponding chassis having a hydraulic four-point height adjustment system.

[0018] According to one aspect, the throttle can be arranged between two supply lines of the fluid circuit. The throttle can, in particular, be designed as a throttle check valve.

[0019] According to one aspect, the throttle can comprise a throttle valve that is designed and arranged to allow the full volume flow to pass in the flow direction and to throttle the volume flow in a throttling direction. This allows for throttling to be implemented, which can be limited in particular to the case of a reduction. The throttling can be provided in particular for cases in which a non-synchronous or asymmetrical reduction could otherwise occur.

[0020] According to one aspect, the throttle can have a throttle cone that is designed and arranged to allow a full volume flow to pass in the throughflow direction and to throttle the volume flow in a throttling direction. This allows for throttling to be implemented, which can be limited in particular to the case of a lowering. The throttling can be provided in particular for cases in which a non-synchronous or asymmetrical lowering could otherwise occur.

[0021] According to one aspect, the throttle check valve can be designed and arranged to allow the full volume flow to pass in the flow direction and to throttle the volume flow in a closing direction. This allows for throttling to be implemented, which can be limited in particular to the case of a lowering. The throttling can be provided in particular for cases in which a non-synchronous or asymmetrical lowering could otherwise occur.

[0022] According to one aspect, the more heavily loaded axle can be an axle located closer to a weight range of the vehicle. This allows the vehicle's design to be taken into account, and a correspondingly synchronized lowering can be achieved via the correspondingly synchronized lowering of the axles via the four-point height adjustment system.

[0023] In one aspect, the weight range may be associated with at least one of an engine, an internal combustion engine, an electric motor, a battery, a cargo space, or a charge storage device.

[0024] According to an independent aspect, a motor vehicle has a chassis, as described elsewhere herein. The motor vehicle can be described by the features, properties, and advantages of the chassis. This also applies across the category boundaries of method, device, and system. Thus, the chassis can also be described by the features, properties, and advantages of the motor vehicle. For reasons of readability and compactness, a repetition of all these features, properties, and advantages is omitted.

[0025] Further advantages, features, and details of the invention will become apparent from the following description, which describes embodiments of the invention in detail with reference to the drawings. The features mentioned in the claims and in the description may be essential to the invention individually or in any combination. They show schematically: Fig. 1 shows an embodiment of a chassis of a motor vehicle; Fig. 2A is a representation of a portion of the embodiment of the chassis of the motor vehicle from Fig. 1; Fig. 2B is a representation of a portion of the embodiment of the chassis of the motor vehicle from Fig. 1 under supervision; Fig. 3 a representation of an embodiment of a distributor piece of the chassis of the motor vehicle from Fig. 1 under supervision; Fig. 4A is an oblique view of an embodiment of a throttle as a throttle check valve; Fig. 4B shows the embodiment of the throttle as a throttle check valve from Fig. 4A in side view; Fig. 5A is an oblique view of an embodiment of a throttle as a throttle valve; Fig. 5B shows a representation of the throttle design as a throttle valve from Fig. 5A under supervision; Fig. 6A is a view of an embodiment of a throttle as a throttle cone in an oblique view; and Fig. 6B shows a representation of the throttle design as a throttle cone from Fig. 6A in side view;

[0026] Fig. 1 shows a representation of an exemplary embodiment of a chassis 10 of a motor vehicle 100. The Fig. 2A shows a corresponding representation of a region of the exemplary embodiment of the chassis 10 of the motor vehicle 100 from Fig. 1 and Fig. 2B shows a representation of a portion of the embodiment of the chassis 10 of the motor vehicle 100 from Fig. 1 in plan view. The chassis has, in particular, a fluid circuit 14. In addition, further fluid circuits 18 can be provided, for example, for distributing lubricants, cooling fluids, or other fluids. A reservoir 5 can store fluids for a hydraulic four-point height adjustment system 300 in order to be able to perform a height adjustment of a front axle (not shown) in a front area 11 and a rear axle (not shown) in a rear area 13, respectively, in order to be able to adjust the height of the vehicle body 111 above a roadway (not shown). As shown here, the four-point height adjustment system 300 can accomplish a height adjustment of the wheels via individual, in particular four, linear actuators.

[0027] The adjustment can be made via a control device 200, which can be designed and configured, for example, to control a compressor 17 in order to feed compressed air into the fluid circuit 14. Alternatively or additionally, a corresponding fluid can also be drawn from the reservoir 15 in order to be able to conduct the fluid in the fluid circuit 14.

[0028] The motor vehicle 100 may have a weight area 110, which may be formed, for example, by an engine 102 and / or a cargo space 104. It may also be formed by a cargo storage device 106.

[0029] As in the Fig. 3 (in plan view), in the exemplary embodiment, a distributor piece 12 can be provided in order to be able to throttle a volume flow of the fluid in the fluid circuit 14 when a more heavily loaded axle is lowered. The more heavily loaded axle can in particular be a rear axle if the motor vehicle 100 is a vehicle with a rear engine, for example. A throttle 20 can be arranged in a bore 26 in order to be arranged between supply lines 30 in order to throttle a volume flow of the fluid during a lowering before flowing from the side of the fluid circuit 14 which can be assigned to the more heavily loaded axle, i.e. can use a fluid redistribution for the lowering of this axle.

[0030] As in the Fig. 5A, a throttle 20 may comprise a throttle check valve 21 which is designed and arranged to allow the full volume flow to pass in the flow direction 60 and to throttle the volume flow in a throttling direction 50. Fig. 5B shows a representation of the exemplary embodiment of the throttle 20 as a throttle check valve 21 from Fig. 4A in side view. A locking cylinder 25 can be provided, which is designed and configured to throttle the volume flow in a throttling direction 50, while allowing a volume flow to pass in a flow direction 60. This can be achieved by interaction of the locking cylinder 25 with conduit walls 27, which can form a bore 26 that can be reduced in size and / or closed by the locking cylinder 25.

[0031] Fig. 5A shows an illustration of an embodiment of a throttle 20 as a throttle valve 22 in an oblique view. Fig. 5B shows the corresponding embodiment of the throttle 20 as throttle valve 22 from Fig. 5A, a top view of the cross-section of the line 27 in the bore 26 to be changed. The change in the cross-section can be achieved by moving a closing flap 29, for example, by tilting it into the line diameter to narrow it. This allows a reversible transition from an open state 22a to a throttle state 22b.

[0032] Fig. 6A shows an illustration of an exemplary embodiment of a throttle 20 as a throttle cone 30 in an oblique top view. Fig. 6B shows a representation of the exemplary embodiment of the throttle 20 as throttle cone 23 from Fig.6A in side view. In this case, a flow direction 31 can be provided in which the throttle cone 23 can allow a volume flow to pass through a central channel 34 in the cone body 30 and through side channels 35 in a flow direction 31. The side channels 35 are opened in particular when the throttle cone body 30 moves away from a counterpart 33 in order to thereby also allow fluid to pass along the cone outer wall 36. In a throttled state 23b, the cone can rest on a counterpart 33 in order to thereby throttle the fluid flow. In embodiments, fluid can also pass via the central channel 34, which can be arranged in the throttle cone body 30.

Claims

[1] Chassis (10) for a motor vehicle (100) comprising a hydraulic four-point height adjustment system (16), the four-point height adjustment system (200) comprising a fluid circuit (14), designed and arranged to adjust the height of at least one front axle via a height adjustment of front wheels and the rear axle via a height adjustment of rear wheels, wherein at least one hydraulic throttle (20) is designed and arranged in a fluid circuit (14) for throttling a lowering behavior of a more heavily loaded axle, characterized bythat the hydraulic throttle (20) has at least one selected from one of a throttle valve (22), which is designed and arranged to allow the volume flow to pass in the flow direction (60) and to throttle the volume flow in a throttling direction (50), or a throttle cone (23), which is designed and arranged to allow a full volume flow to pass in the flow direction (60) and to throttle the volume flow in a throttling direction (50). [2] Chassis (10) according to claim 1, characterized by that the hydraulic throttle (20) is arranged in a supply bore (26) of the fluid line (14) supplying the more heavily loaded axle. [3] Chassis (10) according to one of the preceding claims, characterized by that the throttle (20) is arranged between two supply lines (30) of the fluid circuit (14). [4] Chassis (10) according to one of the preceding claims, characterized bythat the more heavily loaded axle is an axle which is arranged closer to a weight area (110) of the motor vehicle (100). [5] Chassis (10) according to claim 4, characterized by that the weight range (110) is to be assigned to at least one of an engine (102), an internal combustion engine, an electric motor, a battery, a loading space (104) or a charge storage device (106). [6] Motor vehicle (100) comprising a chassis (10) according to one of the preceding claims.

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