Comfort valve arrangement, damper incorporating the same, and a method of controlling the same

Abstract

The present disclosure relates to a comfort valve arrangement for external arrangement to a damper incorporating an intake valve assembly, the comfort valve arrangement comprising: a valve housing adapted in size and shape to provide a valve housing chamber, wherein the comfort valve arrangement is adapted to connect the valve housing chamber to a first intermediate chamber of the intake valve assembly via a first port, and to connect the valve housing chamber to a second intermediate chamber of the intake valve assembly via a second port, the comfort valve arrangement further comprising: a first pressure dependent valve adapted to regulate a damping fluid flow between the first intermediate chamber and the valve housing chamber; a second pressure dependent valve adapted to regulate a damping fluid flow between the second intermediate chamber and the valve housing chamber, the comfort valve arrangement adapted to be controllable between a regulating mode and a disconnected mode. The present disclosure also relates to a damper incorporating the comfort valve arrangement, a hydraulic system, and a method of controlling damping fluid flow by means of the comfort valve arrangement.

Description

COMFORT VALVE ARRANGEMENT, DAMPER INCORPORATING THE SAME, AND A METHOD OF CONTROLLING THE SAMETechnical Field

[0001] The present disclosure relates to a comfort valve arrangement for a damper with an intake valve assembly, a damper incorporating an intake valve assembly and a comfort valve arrangement, and a method of controlling a comfort valve arrangement.Background

[0002] Vehicles generally include dampers that are used in conjunction with suspension systems to absorb vibrations that occur while driving the vehicle. In order to absorb the vibrations, dampers are generally connected between a body and the suspension system of the vehicle. As the damper is compressed or extended, a piston located within the damper may limit flow of damping fluid between a first working chamber and a second working chamber that are defined within the damper to produce a damping force that counteracts the vibrations. By further restricting the flow of damping fluid between the first working chamber and the second working chamber, the damper may generate greater damping forces. Ride comfort, or simply comfort henceforth, can be seen as an overall comfort and well-being of a vehicle’s occupants during vehicle travel. Reducing vibrations generally has a positive impact on comfort. As comfort is dependent on damping force, it is consequently of interest to improve a damper’s ability to generate damping forces and absorb shocks in a fast and efficient manner.

[0003] A damper may incorporate a number of different elements for providing damping characteristics desirable for comfort. For example, a damper can include one or more valve arrangements for controlling fluid flow during extension and compression of the damper. Some damper designs include a valve block that provides mutual hydraulic connections between the first and second working chambers and other components in the hydraulic system. However, such designs often make the damper bulky and increase the overall cost of the damper. Some dampers also have check valves that further increase the size and cost of the damper. Some dampers are adapted to connect to one or more accumulators for storing hydraulic fluid underpressure to maintain pressure and minimize pressure fluctuations in the hydraulic system. However, a main disadvantage of accumulators are their size and weight which make them difficult to incorporate in limited space environments. Moreover, accumulators can be subjected to pressure spikes that exceeds the accumulator’s tolerances, thereby increasing the risk that the accumulators become damaged.

[0004] US 2021 / 0003190 A1 discloses a damper with an intake valve assembly, which intake valve assembly includes a first intake valve body, a second intake valve body, and a divider body, which together define intermediate chambers in the intake valve assembly. A first intake valve controls fluid flow between a second working chamber and a collector chamber. A second intake valve controls fluid flow between one intermediate chamber and the collector chamber. The intake valve assembly is adapted to be working together with two external control valves. This solution can help define an interior accumulator chamber for facilitating regulation of fluid flow. However, depending on radial extension of the intake valve assembly, stroke length of the damper is shortened. Alternatively, the intake valve assembly can be adapted with a reduced radial extension so that a damper piston is enabled to move through a dedicated space of the intake valve assembly. This however limits the size of the intake valve assembly, which consequently limits functions that can be pertinent for comfort and / or increases cost of the intake valve assembly due to necessity of fitting the same functions in a smaller size.

[0005] An intake valve assembly as described in US 2021 / 0003190 A1 can be adapted with a comfort valve to facilitate pressure equalization in the hydraulic system and thereby enhance comfort. This is done by incorporating the comfort valve into a machined cavity of the intake valve assembly. Due to the limited space available in the intake valve assembly, it is difficult to provide a solution which is solely pressure dependent and therefore the comfort valve is adapted to be electrically actuated. However, due to the high frequent actuation during use, the comfort valve requires lots of switching energy. Further, as a way to compensate for the small space available for the comfort valve, it must generally be provided with a very complicated design to make efficient use of the limited space available in the machined cavity. Furthermore, the machined cavity must be provided with very narrow tolerances in order to prevent leakages of the comfort valve which significantly increases cost.

[0006] Hence, in view of the above there is a need for an improved solution which alleviates at least some of the mentioned drawbacks with present solutions.Summary

[0007] It is an object of the present disclosure to provide an improved solution that alleviates at least some of the mentioned drawbacks with present solutions. A first object of the disclosure is to provide a comfort valve arrangement for a damper with an intake valve assembly. A second object of the disclosure is to provide a damper comprising a comfort valve arrangement. A third object of the disclosure is to provide a method of controlling a damping fluid flow in a damper for improved comfort. Advantageous embodiments are summarized in the following.

[0008] The disclosure is based on the realization that a damper can be adapted for enabling a vehicle with improved comfort by arranging a comfort valve arrangement externally to a damper with an intake valve assembly. The intake valve assembly can define a first intermediate chamber hydraulically along a first hydraulic line between a first working chamber and a first hydraulic element, for instance a first accumulator, and a second intermediate chamber hydraulically along a second hydraulic line between a second working chamber and a second hydraulic element, for instance a second accumulator. The comfort valve arrangement can in the arranged position regulate damping fluid pressure between the first intermediate chamber and the second intermediate chamber, and consequently between the first hydraulic line and the second hydraulic line. The comfort valve arrangement can thereby cooperate with the optional first accumulator and the optional second accumulator to maintain pressure and minimize pressure fluctuations in the hydraulic system, which can advantageously facilitate hydraulic control for the purpose of improving comfort. Further, by arranging the comfort valve arrangement externally to the damper, design constraints of the intake valve assembly are relaxed, which e.g., reduces cost and / or allows the intake valve assembly to incorporate more complex valve arrangements.

[0009] The disclosure is further based on the realization that the comfort valve arrangement can regulate pressure between the damping fluid spaces of the intake valve assembly in a step-like manner by means of two pressure dependent valves. In afirst step, a first pressure dependent valve may open to relieve a pressure difference between a first intermediate chamber and the valve housing chamber, and in a second step, a second pressure dependent valve may open to relieve a pressure difference between the valve housing chamber and a second intermediate chamber. This limits pressure spikes from propagating through the hydraulic system. By reducing pressure spikes from propagating through the hydraulic system, hydraulic perturbations can be reduced which allows for increased responsiveness which in turn may favorably impact comfort. Moreover, it may reduce a risk of accumulators being subjected to pressure spikes which can damage them.

[0010] Additionally, the disclosure is based on the realization that the comfort valve arrangement can be adapted for flexible adjustment of comfort by allowing for reconfiguration between various operative modes, such as a regulating mode and a disconnected mode. The control valve arrangement can advantageously be reconfigurable to other modes, such as a closed mode, in which fluid flow is substantially prevented between the first intermediate chamber and the second intermediate chamber via the comfort valve arrangement.

[0011] According to a first aspect of the invention, a comfort valve arrangement for a damper is provided. The damper incorporates an intake valve assembly defining: a first intermediate chamber hydraulically in a first hydraulic line between a first working chamber and a first hydraulic element (such as a first accumulator), and a second intermediate chamber hydraulically in a second hydraulic line between a second working chamber and a second hydraulic element (such as a second accumulator). The comfort valve arrangement comprises: a valve housing adapted in size and shape to provide a valve housing chamber, wherein the comfort valve arrangement is adapted to connect the valve housing chamber to the first intermediate chamber via a first port, and to connect the valve housing chamber to a second intermediate chamber via a second port. The comfort valve arrangement further comprises: a first pressure dependent valve adapted to regulate a damping fluid flow between the first intermediate chamber and the valve housing chamber; a second pressure dependent valve adapted to regulate a damping fluid flow between the second intermediate chamber and the valve housing chamber. The comfort valve arrangement is adapted to be controllable between a regulating mode, in which the first pressure dependent valve and the secondpressure dependent valve are positioned to regulate damping fluid flow, and a disconnected mode, in which the first pressure dependent valve and the second pressure dependent valve are disconnected to permit substantially unregulated damping fluid flow.

[0012] The comfort valve arrangement can advantageously regulate damping fluid pressure to relieve pressure differences between the first intermediate chamber and the second intermediate chamber, and consequently between the first hydraulic line and the second hydraulic line. Thereby, the control valve arrangement can facilitate maintaining pressure and minimize pressure fluctuations in the hydraulic system. Comfort can thereby be improved as an end result.

[0013] Since the comfort valve arrangement enables step-like regulation of damping fluid flow between the first intermediate chamber and the second intermediate chamber, and consequently between the first hydraulic line and the second hydraulic line, it may limit pressure spikes from propagating through the hydraulic system. As a consequence, hydraulic perturbations in the hydraulic system is reduced, which allows for increased responsiveness, which in turn may favorably impact comfort. As an addition, the comfort valve arrangement can thereby also advantageously reduce risk of accumulators being subjected to pressure exceeding safe tolerances, thereby reducing wear and tear and risk of damage.

[0014] Moreover, the comfort valve arrangement advantageously enables switching between a regulating mode and a disconnected mode which allows for even more flexibility with regards to comfort adjustment. The comfort valve arrangement may be adapted to be reconfigurable to a fully closed mode, in which fluid flow is substantially prevented between the first intermediate chamber and the second intermediate chamber via the comfort valve arrangement.

[0015] In addition, the comfort valve arrangement, since it is adapted for external arrangement to the damper, advantageously relaxes size constraints for the intake valve arrangement, thereby reducing cost. The comfort valve arrangement is adapted to regulate pressure using as few as two pressure dependent valves. This allows the comfort valve arrangement to be advantageously adapted with a compact form factor,thereby making efficient use of space available around the damper. As an added effect, the comfort valve arrangement, due to being externally arranged to the damper, enables easy verification of any leakages during use. Further, due to the design of the comfort valve arrangement and external arrangement, leakage can be prevented by one or more proper seals which do not have the same strict tolerances as an internal comfort valve arrangement.

[0016] Further, since the comfort valve arrangement is adapted to regulate damping fluid flow in response to pressure when in a regulating mode, the comfort valve arrangement allows for a reduction of energy consumption when the comfort valve arrangement regulates damping fluid flow. The comfort valve arrangement may be controllable between the regulating mode and the disconnected mode, and optionally to any other mode by means of an actuator. The actuator may be adapted to function based on electrical actuation and / or mechanical actuation. The actuator may be adapted to maintain the comfort valve arrangement in one or more modes or in any modes in a non-energized state. Thereby, power consumption may be significantly decreased.

[0017] The comfort valve arrangement may be adapted to be externally arranged to a damper incorporating an intake valve assembly including a first intake valve body, a second intake valve body, and a divider body. The first intermediate chamber may be located between the first intake valve body and the divider body. The second intermediate chamber may be located between the divider body and the second intake valve body. The intake valve assembly may be adapted with a central cavity for enabling a piston to move at least partially therethrough.

[0018] By hydraulic system, it may be meant the damper and any other elements hydraulically connected to the damper, such as control valves, comfort valve arrangement, accumulators, reservoir, etc. The hydraulic system may include more than one damper adapted with a respective comfort valve arrangement. A vehicle may for instance incorporate a hydraulic system with one damper adapted with a comfort valve arrangement, or two or more such dampers. Each damper adapted with a comfort valve arrangement is also adapted with an intake valve assembly.

[0019] According to one embodiment, the first pressure dependent valve comprises: a first valve element adapted to be pressure dependently moveable relative the housing to regulate damping fluid flow between the first intermediate chamber and the valve housing chamber, and the second pressure dependent valve comprises: a second valve element adapted to be pressure dependently moveable relative the housing to regulate damping fluid flow between the second intermediate chamber and the valve housing chamber. The first valve element and the second valve element are coupled to one another by means of a coupling means. The comfort valve arrangement is adapted so that a switch between said regulating mode and said disconnected mode includes moving the coupling means in at least a first direction between a regulating mode position and a disconnected mode position. By this, the comfort valve arrangement may advantageously switch between the regulating mode and the disconnected mode in a reliable manner as follows.

[0020] When the first valve element moves in an opening direction, the second valve element moves in a closing direction, until the second valve element moves to a closed position, in which position the second valve element closes the second port. Thereby, the comfort valve arrangement advantageously limits pressure spikes from propagating from the first intermediate chamber to the second intermediate chamber, and consequently from the first hydraulic line to the second hydraulic line. When the second valve element moves in an opening direction, the first valve element moves into a closing direction, until the first valve element moves to a closed position, in which position the first valve element closes the first port. Thereby, the comfort valve arrangement advantageously limits pressure spikes from propagating from the second intermediate chamber to the first intermediate chamber, and consequently from the second hydraulic line to the first hydraulic line.

[0021] The coupling means may be adapted to move between the regulating mode position and the disconnected mode position in at least a first direction, which may include a radial direction, a longitudinal direction, and / or a circumferential direction. The first valve element may be adapted to interact with a first port to regulate damping fluid flow between a first intermediate chamber and the valve housing chamber. The second valve element may be adapted to interact with a second port to regulate damping fluid flow between a second intermediate chamber and the valve housingchamber. The first valve element and the second valve element may be provided with any suitable shape. The first port may extend along an first port axis. The first valve element may be moveable relative the first port along said first port axis. The second port may extend along a second port axis. The second valve element may be moveable relative the second port along said second port axis. Movement of the first valve element and the second valve element may be caused by movement of the coupling means relative the housing. The first valve element may be moveable relative the first port in response to pressure. The second valve element may be moveable relative the second port in response to pressure.

[0022] According to one embodiment, said coupling means include a rocker element arranged to pivot about a pivot point, wherein said switch between said regulating mode and said disconnected mode includes moving the pivot point of the rocker element relative the valve housing in said at least a first direction. A rocker element advantageously enables the first valve element and the second valve element to move in an inverse manner. Moreover, a rocker element enables coupling of the first valve element and the second valve element in a simple manner, thereby resulting in a cost effective solution. The rocker element may include a main part adapted to pivot about said pivot point. The rocker element may include one or more connecting parts. A connecting part may be attached at one end with a valve element and at an opposite end connected to the main part via a hinge element to allow pivoting motion. Thereby, said valve element may interact with a port in substantially along a port axis. As a consequence of the rocker element, said valve element may move substantially at an angle with a port axis. The first valve element and / or the second valve element may be adapted to move in this manner.

[0023] According to one embodiment, said coupling means include a support element, and the first valve element and the second valve element are adapted to move relative said support element, wherein said switch between said regulating mode and said disconnected mode includes moving the support element relative the valve housing in said at least a first direction. The support element may define a respective receiving aperture for receiving an axial member of a valve element, so that the valve element can slide relative the support member between a closed position and an openposition. The first valve element and / or the second valve element may be adapted to move in this manner.

[0024] According to one embodiment, the comfort valve arrangement further comprises a first spring element arranged between the first valve element and the support element; and / or a second spring element arranged between the second valve element and the support element. The first spring element and / or the second spring element can be adapted to bias a respective valve element away from the support element. When the support element is in a regulating mode position, the first spring element and / or the second spring element can thereby bias a respective valve element into a closed position.

[0025] According to one embodiment, said coupling means include a resilient disc element, and the first valve element and the second valve element are attached to the resilient disc element, wherein said switch between said regulating mode and said disconnected mode and said disconnected mode includes moving the resilient disc element relative the valve housing in said at least a first direction. When the resilient disc is in a regulating mode position, the resilient disc can thereby bias a respective valve element into a closed position.

[0026] According to one embodiment, the comfort valve arrangement further comprises a common spring element arranged to bias the coupling means to the regulating mode position or to an intermediate position between the regulating mode position and the disconnected mode position. In the first option, the comfort valve arrangement is biased into a regulating mode, and needs to be actuated into a disconnected mode. In the second option, the comfort valve arrangement is biased into a disconnected mode, and needs to be actuated into a regulated mode. The comfort valve arrangement may be configurable into a closed mode in which the comfort valve arrangement substantially prevents fluid flow. The common spring element may be arranged to bias the coupling means to a closed mode position, in which case the comfort valve arrangement is biased into a closed mode, and needs to be actuated into a regulated mode or a disconnected mode.

[0027] According to one embodiment, said at least a first direction includes a direction in a radial direction of the damper during use. This may cooperate well with moving first valve element and second valve element along respective port axes to regulate damping fluid flow.

[0028] According to one embodiment, said at least a first direction includes a direction in a longitudinal direction of the damper during use. This provides an alternative solution for how the coupling means may be moveable.

[0029] According to one embodiment, said at least a first direction includes a direction in a circumferential direction of the damper during use. This provides an alternative solution for how the coupling means may be moveable.

[0030] According to one embodiment, said at least a first direction includes any combination of a radial direction, a longitudinal direction, and a circumferential direction of the damper during use.

[0031] According to one embodiment, the comfort valve arrangement further comprises an actuator for controlling the comfort valve arrangement between the regulating mode and the disconnected mode. By this, the comfort valve arrangement may be advantageously controllable from a distance.

[0032] According to one embodiment, said actuator includes a solenoid device. The solenoid device may comprise a coil. The solenoid device may comprise a moveable plunger, which plunger is moveable in response to magnetic field generated by the coil. The coupling means may be connected to the moveable plunger.

[0033] According to one embodiment, any one of, or both of, the first pressure dependent valve and the second pressure dependent valve is controllable to a closed state. A closed state may include a pressure dependent valve to be actuated so that a valve element interacts with a port to close or at least substantially close fluid flow through the port. A valve element may interact with a valve seat associated with the port to close or at least substantially close fluid flow through the port. The first pressuredependent valve and / or the second pressure dependent valve may be adapted in this manner.

[0034] According to one embodiment, the coupling means is coupled to a plunger of the solenoid device. The coupling means may be pivotably coupled to the plunger. The coupling means may be fixedly attached to the plunger. Alternatively, the coupling means is not coupled to the plunger, but displaceable in response to interaction with the plunger.

[0035] According to a second aspect of the invention, a damper for a vehicle is provided. The damper comprises: a cylinder, an intake valve assembly including a first intake valve body, a second intake valve body, and a divider body, which intake valve assembly is arranged in said cylinder, thereby forming a first intermediate chamber between the first intake valve body and the divider body and a second intermediate chamber between the divider body and the second intake valve body, and a comfort valve arrangement according to the first aspect or any embodiments thereof. A vehicle may be provided with one or more dampers according to the first aspect. By incorporating one or more dampers according to the first aspect, ride comfort of the vehicle is improved in a cost efficient manner.

[0036] According to one embodiment, the damper comprises a first control valve for regulating fluid flow to and from a first working chamber and / or a second control valve for regulating fluid flow to and from a second working chamber.

[0037] According to one embodiment, the first control valve and / or the second control valve comprises a solenoid valve, or any combination of a solenoid valve, a fixed restriction, a pressure relief valve, and a check valve.

[0038] According to one embodiment, the first port and the second port are provided on the cylinder.

[0039] According to one embodiment, the first port and the second port are substantially aligned in a circumferential direction of the damper.

[0040] According to one embodiment, the damper is adapted with a twin tube design. By twin tube design, it may be meant that the damper comprises an inner cylinder (tube) and an outer cylinder (tube).

[0041] According to one embodiment, the damper is adapted for connecting to one or more accumulators. The damper may comprise one or more ports for connecting the first intermediate chamber and / or the second intermediate chamber with said one or more accumulators.

[0042] According to one embodiment, the damper is adapted with an outer valve casing for defining one or more fluid flow paths between a first control valve and the first intermediate chamber and / or a second control valve and the second intermediate chamber.

[0043] According to a third aspect of the invention, a method of controlling a damping fluid flow between a first damping fluid space, which first damping fluid space is located between a first intake valve body and a divider body in a cylinder of a damper, and a second damping fluid space which second damping fluid space is located between a second intake valve body and a divider body, by means of a comfort valve arrangement according to the first aspect or any embodiments thereof, the method comprising the steps of: controlling the comfort valve arrangement to a regulating mode, in which the first pressure dependent valve and the second pressure dependent valve regulate damping fluid flow, and / or controlling the comfort valve arrangement to a disconnected mode, in which the first pressure dependent valve and the second pressure dependent valve are disconnected to permit substantially unregulated damping fluid flow between the first intermediate chamber and the second intermediate chamber via said valve housing chamber.

[0044] According to one embodiment, the method comprises a step of controlling the comfort valve arrangement to a closed mode, in which the first pressure dependent valve and the second pressure dependent valve are closed to substantially prevent fluid flow.

[0045] According to a fourth aspect, a hydraulic system for a vehicle is provided. The hydraulic system comprises: a first damper, a second damper, wherein a firsthydraulic circuit hydraulically connects a rebound chamber of a first damper with a compression chamber of a second damper, and a second hydraulic circuit hydraulically connects a compression chamber of the first damper with a rebound chamber of the second damper. The hydraulic system further comprises: a first accumulator hydraulically connected to the first hydraulic circuit; a second accumulator hydraulically connected to the second hydraulic circuit, a first comfort valve arrangement hydraulically connected between the first hydraulic circuit and the second hydraulic circuit; a second comfort valve arrangement hydraulically connected between the first hydraulic circuit and the second hydraulic circuit, wherein the first comfort valve arrangement and the second comfort valve arrangement are adapted to regulate fluid flow in a pressure dependent manner, wherein the first damper and / or the second damper comprises an intake valve assembly and the first comfort valve arrangement and / or the second comfort valve arrangement is a comfort valve arrangement according to the first aspect or any embodiments thereof.

[0046] According to one embodiment, the hydraulic system further comprises: a third damper; a fourth damper, wherein the first hydraulic circuit hydraulically connects to a rebound chamber of a third damper and a compression chamber of a fourth damper, and the second hydraulic circuit hydraulically connects to a compression chamber of the third damper and a rebound chamber of the fourth damper. The hydraulic system further comprises: a third accumulator hydraulically connected to the first hydraulic circuit; a fourth accumulator hydraulically connected to the second hydraulic circuit; a third comfort valve arrangement hydraulically connected between the first hydraulic circuit and the second hydraulic circuit; a fourth comfort valve arrangement hydraulically connected between the first hydraulic circuit and the second hydraulic circuit, wherein the third comfort valve arrangement and the fourth comfort valve arrangement are adapted to regulate fluid flow in a pressure dependent manner. By such a hydraulic system comprising a comfort valve arrangement as herein disclosed, vehicle comfort may be improved and / or a certain level of comfort provided at a more cost efficient manner and / or provided in a configuration which facilitates maintenance of the comfort valve arrangement. The first and second damper may form a front set of dampers or a rear set of dampers. The first damper and the second damper may comprise an intake valve assembly. By intake valve assembly, it may be meant an intake valve assembly as described in the context of the first aspect of theinvention. The first comfort valve arrangement may be a comfort valve arrangement according to the first aspect or any embodiments thereof. The second comfort valve arrangement may be a comfort valve arrangement according to the first aspect or any embodiments thereof.

[0047] According to one embodiment, the hydraulic system further comprises: a third damper; a fourth damper, wherein a third hydraulic circuit hydraulically connects a rebound chamber of a third damper and a compression chamber of a fourth damper, and a fourth hydraulic circuit hydraulically connects a compression chamber of the third damper and a rebound chamber of the fourth damper. The hydraulic system further comprises: a third accumulator hydraulically connected to the third hydraulic circuit; a fourth accumulator hydraulically connected to the fourth hydraulic circuit; a third comfort valve arrangement hydraulically connected between the third hydraulic circuit and the fourth hydraulic circuit; a fourth comfort valve arrangement hydraulically connected between the third hydraulic circuit and the fourth hydraulic circuit, wherein the third comfort valve arrangement and the fourth comfort valve arrangement are adapted to regulate fluid flow in a pressure dependent manner.

[0048] According to one embodiment, the hydraulic system further comprises a manifold arrangement hydraulically connected between the first hydraulic circuit, the second hydraulic circuit, the third hydraulic circuit, and the fourth hydraulic circuit. The manifold arrangement may provide a first hydraulic connection point, a second hydraulic connection point, a third hydraulic connection point, and a fourth hydraulic connection point. The first hydraulic connection point may be hydraulically connected to the first hydraulic circuit. The second hydraulic connection point may be hydraulically connected to the second hydraulic circuit. The third hydraulic connection point may be hydraulically connected to the third hydraulic circuit. The fourth hydraulic connection point may be connected to the fourth hydraulic circuit. The manifold arrangement may comprise a plurality of pistons axially moveable in a respective cylinder chamber, thereby dividing each cylinder chamber into a rebound chamber and a compression chamber. A first piston and a second piston may be coupled to one another by means of a first manifold rod (LDU rod). A first cylinder chamber and a second cylinder chamber may be axially arranged relative one another. The first cylinder chamber and the second cylinder chamber may be provided by a first manifold cylinder. The firstmanifold cylinder may provide two outer chambers and two inner chambers arranged between the two outer chambers. A third piston and a fourth piston may be coupled to one another by means of a second manifold rod (LDU rod). A third cylinder chamber and a fourth cylinder chamber may be axially arranged relative one another. The third cylinder chamber and the fourth cylinder chamber may be provided by a second manifold cylinder. The second manifold cylinder may provide two outer chambers and two inner chambers arranged between the two outer chambers. The first LDU rod may be axially moveable in the first LDU cylinder in response to pressure difference acting on the respective pistons of the first LDU rod. The second LDU rod may be axially moveable in the second LDU cylinder in response to pressure in response to pressure difference acting on the respective pistons of the second LDU rod. A first outer chamber of the first manifold cylinder may be hydraulically connected to the first hydraulic circuit. A first outer chamber of the second manifold cylinder may be hydraulically connected to the second hydraulic circuit. A second outer chamber of the first manifold cylinder may be hydraulically connected to the third hydraulic circuit. A second outer chamber of the second manifold cylinder may be hydraulically connected to the fourth hydraulic circuit. A first inner chamber of the first manifold cylinder and a first inner chamber of the second manifold cylinder may be hydraulically connected by means of a first hydraulic manifold circuit. A second inner chamber of the first manifold cylinder and a second inner chamber of the second manifold cylinder may be hydraulically connected by means of a second hydraulic manifold circuit. A fifth accumulator may be connected to the first hydraulic manifold circuit. A sixth accumulator may be hydraulically connected to the second hydraulic manifold circuit. A first comfort valve may be hydraulically connected between the first outer chamber and the second outer chamber of the first manifold cylinder. A second comfort valve may be hydraulically connected between the first outer chamber and the second outer chamber of the second manifold cylinder.

[0049] According to one embodiment, the third damper and / or the fourth damper comprises an intake valve assembly; and the third comfort valve arrangement and / or the fourth comfort valve arrangement is a comfort valve arrangement according to the first aspect or any embodiments thereof.

[0050] According to one embodiment, one or more of the dampers of the hydraulic system is a damper according to the second aspect or any embodiments thereof. Alldampers of the first, second, the optional third, and the optional fourth damper may be a damper according to the second aspect or any embodiments thereof.

[0051] According to one embodiment, the hydraulic system further comprises one or more control valves for regulating flow into, and out of, the dampers. A first control valve may be arranged to regulate flow into, and out of, a compression chamber of a damper. A second control valve may be arranged to regulate flow into, and out of, a rebound chamber of a damper. One or more dampers of the first, second, third, and fourth damper may be provided with a set of a first and second control valve. All dampers may be provided with a set of a first and second control valve.

[0052] Effect and features of the second and third and fourth aspects are largely analogous to those described above in connection with the first aspect. Embodiments mentioned in relation to the first aspect are largely compatible with the second and third and fourth aspects. It is further noted that the inventive concepts relate to all possible combinations of features unless explicitly stated otherwise.

[0053] It is to be understood that this disclosure is not limited to the particular component parts of the device described or steps of the methods described as such device and method may vary. It is also to be understood that the terminology used herein is for purpose of describing particular embodiments only, and is not intended to be limiting. It must be noted that, as used in the specification and the appended claim, the articles "a", "an", "the", and "said" are intended to mean that there are one or more of the elements unless the context clearly dictates otherwise. Thus, for example, reference to "a unit" or "the unit" may include several devices, and the like. Furthermore, the words "comprising", "including", “incorporating” and similar wordings do not exclude other elements or steps.Brief Description of the Drawings

[0054] The invention will in the following be described in more detail with reference to the enclosed drawings, wherein:Fig. 1 shows a schematic illustration of a damper provided with a comfort valve arrangement according to one embodiment of the disclosure;Fig. 2 shows a cross-sectional side view of a damper provided with a comfort valve arrangement according to one embodiment of the disclosure;Figs. 3a-3b show cross-sectional side views of a comfort valve arrangement according to one embodiment of the disclosure when mounted to a damper;Figs. 4a-4b show cross-sectional side views of a comfort valve arrangement according to one embodiment of the disclosure when mounted to a damper;Fig. 5 show a cross-sectional side view of a comfort valve arrangement according to one embodiment of the disclosure when mounted to a damper;Fig. 6 show a cross-sectional side view of a comfort valve arrangement according to one embodiment of the disclosure when mounted to a damper;Fig. 7 shows a schematic illustration of a damper provided with a comfort valve arrangement according to one embodiment of the disclosure;Figs. 8a-8b show schematic illustrations of dampers provided with comfort valve arrangements according to one embodiment of the disclosure when connected to a hydraulic system for a vehicle;Fig. 9 shows a schematic illustration of dampers provided with comfort valve arrangements according to one embodiment of the disclosure when connected to a hydraulic system for a vehicle;Fig. 10 shows a schematic illustration of dampers provided with comfort valve arrangements according to one embodiment of the disclosure when connected to a hydraulic system for a vehicle;Fig. 11 shows a method chart of a method according to one embodiment of the disclosure.Description of Embodiments

[0055] The present invention will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, like numbers refer to like elements.

[0056] Fig. 1 shows a schematic illustration of a damper 200 provided with a comfort valve arrangement 100 according to one embodiment of the disclosure. The damper 200 comprises a damper cylinder and a piston 203 dividing a cavity of the damper cylinder into a first working chamber 201 and a second working chamber 202. The damper cylinder extends along a longitudinal axis DL. The piston 203 is adapted to be moveable in the damper cylinder along said longitudinal axis DL between at least a first position and a second position. The damper cylinder during use is filled with a damping fluid of any suitable choice. The damper 200 is provided with a first port P1 hydraulically connecting the first working chamber 201 with a first accumulator A1 via a first hydraulic line 211 . The damper 200 is provided with a second port P2 hydraulically connecting the second working chamber 202 with a second accumulator A2 via a second hydraulic line 212. The first accumulator A1 is optional. The second accumulator A2 is optional. The damper may be hydraulically connected to only one accumulator or more than one accumulator or one or more reservoirs or any other suitable hydraulic component.

[0057] As shown in Fig. 1 , the damper 200 is provided with a first control valve 204 for regulating fluid flow at a point along the first hydraulic line 211 . As shown in Fig. 1 , the damper is provided with a second control valve 205 for regulating fluid flow at a point along the second hydraulic line 212. The first control valve 204 is optional. The second control valve 205 is optional. The damper 200 may be provided with other types of valves for regulating damping fluid flow. However, the damper 200 may preferably be provided with the first control valve 204 and the second control valve 205 in order to regulate fluid flow in a compression stroke or a rebound stroke direction of the piston. The damper 200 may be provided with a piston rod for attaching the piston to an external element. The damper 200 may be provided with one or more sealing elements for sealing damping fluid in the hydraulic system.

[0058] The first control valve 204 and / or the second control valve 205 may be adapted to be controllable from a distance. The first control valve 204 and / or the second control valve 205 may be adapted to define one or more fluid paths. The first control valve 204 and / or the second control valve 205 may define two or more parallel fluid paths. As shown in Fig. 1 , the first control valve 204 and / or the second control valve 205 may comprise a solenoid valve, a fixed restriction, a pressure relief valve,and a check valve connected in parallel. However, the first control valve 204 and / or the second control valve 205 are not limited to such a combination, rather any one of them can comprise any combination thereof or simply a valve adjustable from a distance such as a solenoid valve. However, incorporating more valve elements in parallel allows for different damping characteristics for different stroke speeds which advantageously improves comfort.

[0059] The damper 200 is provided with a comfort valve arrangement 100. The comfort valve arrangement 100 is arranged to hydraulically connect a point along the first hydraulic line 211 between the first control valve 204 and the first accumulator A1 with a point along the second hydraulic line 212 between the second control valve 205 and the second accumulator A2. The comfort valve arrangement 100 may be hydraulically connected to the first hydraulic line 211 so that the first control valve 204 is hydraulically between the first working chamber 201 and the comfort valve arrangement 100. The comfort valve arrangement 100 may be hydraulically connected to the second hydraulic line 212 so that the second control valve 205 is hydraulically between the second working chamber 202 and the comfort valve arrangement 100.

[0060] Fig. 2 shows a cross-sectional side view of a damper 200 provided with a comfort valve arrangement 100 according to one embodiment of the disclosure. The damper 200 incorporates an intake valve assembly 250 including a first intake valve body 251 , a divider body 253, and a second intake valve body 252. The divider body 253 is arranged between the first intake valve body 251 and the second intake valve body 252 in an axial direction of the damper. A first intermediate chamber 251 A is formed between the first intake valve body 251 and the divider body 253. A second intermediate chamber 252A is formed between the divider body 253 and the second intake valve body 252. Although not shown in Fig. 2, the first intermediate chamber 251 A is hydraulically connected to a first working chamber, and the second intermediate chamber 252A is hydraulically connected to a second working chamber.

[0061] A first control valve may be arranged to regulate damping fluid flow between the first working chamber and the first intermediate chamber. A second control valve may be arranged to regulate damping fluid flow between the second working chamber and the second intermediate chamber. Further, although not shown in Fig. 2,the first intermediate chamber may be hydraulically connected to an external hydraulic element, such as an accumulator. The second intermediate chamber may be hydraulically connected to an external hydraulic element, such as an accumulator. The intake valve assembly 250 may be provided with one or more valve elements, such as a shim stack for regulating fluid flow from the first intermediate chamber into the first working chamber, and such as a shim stack for regulating fluid flow from the second intermediate chamber into the second working chamber.

[0062] The comfort valve arrangement 100 is externally arranged to the damper 200. The comfort valve arrangement 100 comprises a valve housing 110 adapted in size and shape to provide a valve housing chamber 110A. The valve housing 110 may be adapted with any suitable shape, which may be compact and cooperate with other elements of the damper and / or the vehicle when the damper is mounted for use. The comfort valve arrangement 100 is adapted to connect the valve housing chamber 110A to the first intermediate chamber 251 A via a first port P1 . The comfort valve arrangement 100 is adapted to connect the valve housing chamber 110A to the second intermediate chamber 252A via a second port P2. The first port P1 is provided in the cylinder of the damper 200. The second port P2 is provided in the cylinder of the damper 200. The first port P1 and the second port P2 may be provided by any suitable means such as by means of drilling, cutting by any suitable tool or medium, hole punching, or the like. The valve housing 110 may be fixedly attached to the cylinder of the damper 200. The valve housing 110 may be fixedly attached by means of any suitable methods, for instance welding.

[0063] The comfort valve arrangement 100 can advantageously regulate damping fluid pressure to relieve pressure differences between the first intermediate chamber 251 A and the second intermediate chamber 252A, and consequently between the first hydraulic line and the second hydraulic line. Thereby, the control valve arrangement 100 can facilitate maintaining pressure and minimize pressure fluctuations in the hydraulic system. Comfort can thereby be improved as an end result.

[0064] The comfort valve arrangement 100 is adapted to be controllable between a regulating mode, in which the first pressure dependent valve 120 and the second pressure dependent valve 130 are positioned to regulate damping fluid flow, and adisconnected mode, in which the first pressure dependent valve 120 and the second pressure dependent valve 130 are disconnected to permit substantially unregulated damping fluid flow. The comfort valve arrangement 100 may be further adapted to be controllable into a closed mode, in which the first pressure dependent valve 120 and the second pressure dependent valve 130 are positioned to substantially prevent damping fluid flow. The comfort valve arrangement 100 advantageously enables selective adjustment of damping characteristics and as a consequence comfort.

[0065] The comfort valve arrangement 100 further comprises a first pressure dependent valve 120 adapted to regulate a damping fluid flow between the first intermediate chamber 251 A and the valve housing chamber 110A. The comfort valve arrangement 100 further comprises a second pressure dependent valve 130 adapted to regulate a damping fluid flow between the second intermediate chamber 252A and the valve housing chamber 110A. As exemplified in Fig. 2, the first pressure dependent valve 120 comprises a first valve element 121 adapted to be pressure dependently moveable relative the housing 110 to regulate damping fluid flow between the first intermediate chamber 251 A and the valve housing chamber 110A. The first valve element 121 may in a first position interact with the first port P1 to regulate fluid flow, or substantially prevent fluid flow, between the first intermediate chamber 251 A and the valve housing chamber 110A. The first valve element 121 may in a second position permit more fluid flow than in the first position between the first intermediate chamber 251 A and the valve housing chamber 110A. As exemplified in Fig. 2, the second pressure dependent valve 130 comprises a second valve element 131 adapted to be pressure dependently moveable relative the housing 110 to regulate damping fluid flow between the second intermediate chamber 252A and the valve housing chamber 110A. The second valve element 121 may in a first position interact with the second port P2 to regulate fluid flow, or substantially prevent fluid flow, between the second intermediate chamber 252A and the valve housing chamber 110A. The second valve element 121 may in a second position permit more fluid flow than in the first position between the second intermediate chamber 252A and the valve housing chamber 110A.

[0066] As further exemplified in Fig. 2, the comfort valve arrangement 100 is further adapted so that the first valve element 121 and the second valve element 131 are coupled to one another by means of a coupling means 140. The comfort valvearrangement 100 is further adapted so that a switch between said regulating mode and said disconnected mode, or between any first mode and any second mode, includes moving the coupling means 140 in at least a first direction between a regulating mode position and a disconnected mode position. The coupling means may be moveable into a closed mode position. In one embodiment, the coupling means is moveable between a first position and at least a second position by means of a solenoid device. The solenoid device may include a coil for generating a magnetic field and a plunger adapted to be moveable in response to the magnetic field generated. The coupling means may be coupled to the plunger. Thus, by moving the plunger between a first position and a second position, the coupling means 140 is consequently moved as well, thereby impacting the positions of the first valve element 121 and the second valve element 131 .

[0067] In one embodiment, the coupling means 140 includes a rocker element 140A. The rocker element is arranged to pivot about a pivot point. Said switch between said regulating mode and said disconnected mode, or between a first mode and a second mode, includes moving the pivot point of the rocker element 140A relative the valve housing 110 in said at least a first direction.

[0068] Figs. 3a-3b show cross-sectional side views of a comfort valve arrangement according to the disclosure when arranged to a damper. In Fig. 3a, the comfort valve arrangement is in a closed state. The first pressure dependent valve 120 and the second pressure dependent valve 130 are in a closed position. In Fig. 3b, the comfort valve arrangement 100 is in a regulating mode. When damping fluid flow flows from the second intermediate chamber into the valve housing chamber, the second valve element of the second pressure dependent valve is displaced from the port P2, and since the first valve element and the second valve element are coupled by a rocker element 140A, the first valve element is caused to move to close the first port P1 as shown in Fig. 4a. Thereby, the comfort valve arrangement relieves pressure difference between the second intermediate chamber and the valve housing chamber. When there is not enough pressure difference to keep the second valve element displaced from the second port P2, the second valve element may return to its previous position. This causes the first pressure dependent valve to open, thereby relieving pressure difference between the valve housing chamber and the first intermediate chamber.When damping fluid flow flows from the first intermediate chamber into the valve housing chamber, the first valve element of the second pressure dependent valve is displaced from the first port P1 , and since the first valve element and the second valve element are coupled by a rocker element 140A, the second valve element is caused to move to close the second port P2 as shown in Fig. 4b. Thereby, the comfort valve arrangement relieves pressure difference between the first intermediate chamber and the valve housing chamber. When there is not enough pressure difference to keep the first valve element displaced from the first port P1 , the first valve element may return to its previous position. This causes the second pressure dependent valve to open, thereby relieving pressure difference between the valve housing chamber and the second intermediate chamber. As such, the comfort valve arrangement enables steplike pressure relief, which may limit pressure spikes from propagating through the hydraulic system and cause hydraulic perturbations that can negatively impact comfort. As a result, comfort is improved.

[0069] As exemplified in Fig. 5, in one embodiment of the comfort valve arrangement 100, the coupling means 140 include a support element 140B, and the first valve element 121 and the second valve element 131 are adapted to move relative said support element MOB, wherein said switch between said regulating mode and said disconnected mode includes moving the support element MOB relative the valve housing 110 in said at least a first direction. The comfort valve arrangement 100 includes an optional first spring element arranged between the first valve element 121 and the support element MOB. The comfort valve arrangement 100 includes an optional second spring element arranged between the second valve element 131 and the support element MOB.

[0070] As exemplified in Fig. 6, in one embodiment of the comfort valve arrangement 100, the coupling means 140 include a resilient disc element 140C, and the first valve element and the second valve element are attached to the resilient disc element 140C, wherein said switch between said regulating mode and said disconnected mode includes moving the resilient disc element 140C relative the valve housing 110 in said at least a first direction.

[0071] Fig. 7 shows a schematic illustration of a damper 200 provided with a comfort valve arrangement according to one embodiment of the disclosure. The damper 200 comprises a cylinder arrangement including an outer cylinder 200A and an inner cylinder 200B. The inner cylinder 200B is arranged within the outer cylinder 200A. An outer chamber 2010 is formed between the inner cylinder 200B and the outer cylinder 200A. The damper 200 comprises a piston 203 attached to a piston rod 2030. The piston 203 is moveable within a cavity formed by the inner cylinder, and the piston divides the cavity into a first working chamber 201 and a second working chamber 202. The first working chamber 201 is hydraulically connected to the outer chamber 2010 via one or more ports 2011 . The damper 200 comprises an intake valve assembly 250 including a first intake valve body, a second intake valve body, and a divider body. A first intermediate chamber is formed between the first intake valve body and the divider body. A second intermediate chamber is formed between the divider body and the second intake valve body. The damper 200 is adapted with an outer valve casing portion adapted to define one or more fluid flow paths between the first working chamber and the first intermediate chamber and one or more fluid flow paths between the second working chamber and the second intermediate chamber. The damper 200 further comprises a first control valve for regulating damping fluid flow between the first working chamber and the first intermediate chamber. The damper further comprises a second control valve for regulating damping fluid flow between the second working chamber and the second intermediate chamber. The damper 200 further comprises a comfort valve arrangement 100 as herein previously detailed. The comfort valve arrangement 100 is adapted to regulate fluid flow between the first intermediate chamber and the second intermediate chamber.

[0072] Figs. 8a-8b show schematic illustrations of dampers 200a, 200b provided with comfort valve arrangements 100a, 100b according to one embodiment of the disclosure when connected to a hydraulic system for a vehicle. A first set of two dampers 200a, 200b are shown in Figs. 8a, 8b for a rear or front of a vehicle. Although not shown, both rear and / or front set of damper of a vehicle can be adapted in this manner. A first hydraulic circuit 211 hydraulically connects a rebound chamber of a first damper 200a with a compression chamber of a second damper 200b. A second hydraulic circuit 212 hydraulically connects a compression chamber of the first damper 200a with a rebound chamber of the second damper 200b. The first damper 200a isadapted with a first comfort valve arrangement 100a as herein disclosed which is arranged for hydraulically connecting the first hydraulic circuit 211 with the second hydraulic circuit 212. Although not shown, the first damper 200a is adapted with an intake valve assembly. The first comfort valve arrangement 100a is externally arranged to the damper 200a. The first comfort valve arrangement 100a is configurable between an open state and a closed state. In Fig. 8a, the first comfort valve arrangement 100a is shown as being in a closed state. The second damper 200b is adapted with a second comfort valve arrangement 100b as herein disclosed which is arranged for hydraulically connecting the first hydraulic circuit 211 with the second hydraulic circuit 212. Although not shown, the second damper 200b is adapted with an intake valve assembly. The second comfort valve arrangement 100b is externally arranged to the second damper 200b. The second comfort valve arrangement 100b is configurable between an open state and a closed state. In Fig. 8a, the second comfort valve arrangement 100b is shown as being in a closed state. The first damper is also provided with a set of control valves 204a, 205a for regulating fluid flow into, and out of, rebound chamber and compression chamber respectively. The second damper is also provided with a set of control valves 204b, 205b for regulating fluid flow into, and out of, rebound chamber and compression chamber respectively.

[0073] For a single wheel input with comfort valve arrangements 100 closed, as shown in Fig. 8a with a right side single wheel input, displaced bore volume gets pushed into a first accumulator A1 via the first hydraulic circuit 211 while displaced bore-rod volume gets pulled from a second accumulator A2 via the second hydraulic circuit 212. This results in a pressure difference between the first hydraulic circuit 211 and the second hydraulic circuit 212 that creates a resisting force. However the force is much less than a force from a roll motion with the same cylinder displacement because there is only one displaced cylinder volume involved in a single wheel input. A roll motion involves the displaced fluid from four cylinders going into a circuit’s accumulators. The single wheel stiffness with comfort valves closed is less than the single wheel stiffness in a conventional sway bar vehicle with the same roll stiffness. This is because the front and rear sway bares are not interconnected in a sway bar system. With this configuration for a vehicle with front and rear set of dampers, the interconnection results in front and rear roll stiffness acting like springs in series forsingle wheel inputs. Two springs in series have a lower rate than either of the springs by themselves.

[0074] For a single wheel input with the second comfort valve arrangement 100b open, as shown in Fig. 8b, most of the displaced fluid from the cylinder’s compression chamber is pushed through the comfort valve and into the cylinder’s rebound chamber. Only the displaced rod volume is pushed into the first accumulator A1 which results in negligible resistance to cylinder displacement.

[0075] Fig. 9 shows a schematic illustration of a front set of dampers 200a, 200b and a rear set of dampers 200c, 200d in a first configuration of a hydraulic system of a vehicle. A first hydraulic circuit 211 hydraulically interconnects a rebound chamber of a first damper 200a, a rebound chamber of a third damper 200c, a compression chamber of a second damper 200b, and a compression chamber of a fourth damper 200d. A second hydraulic circuit 212 hydraulically interconnects a compression chamber of the first damper 200a, a compression chamber of the third damper 200c, a rebound chamber of the second damper 200b, and a rebound chamber of the fourth damper 200d. Each damper 200a, 200b, 200c, 200d is provided with comfort valve arrangements 100a, 100b, 100c, 100d according to one embodiment of the disclosure. Although not shown, the damper 200a, 200b, 200c, 200d are adapted with intake valve assemblies. The comfort valve arrangements 100a, 100b, 100c, 100d are externally arranged to a respective damper 200a, 200b, 200c, 200d. The comfort valve arrangements 100a, 100b, 100c, 100d are configurable between an open state and a closed state.

[0076] As an example, in a turn to the right, the dampers 200b, 200d on the right side will compress, and the dampers 200a, 200c on the left side will extend. Compression of the right side dampers 200b, 200d and extension of the left side dampers 200a, 200c will push fluid in the first hydraulic circuit 211 into a first set of accumulators A1 , A3 and pull fluid from a second set of accumulators A2, A4 into the second hydraulic circuit 212. Fluid pushed into the first set of accumulators A1 , A3 will raise fluid pressure in the first hydraulic circuit 211 . Fluid pulled from the second set of accumulators A2, A4 will lower fluid pressure in the second hydraulic circuit 212. The pressure difference between the first hydraulic circuit 211 and the second hydrauliccircuit 212 gives a force that resists compression of the right side dampers 200b, 200d and resist extension of the left side dampers 200a, 200b. Thus roll motion is resisted. The accumulators act as a roll spring. The comfort valve arrangement 100a, 100b, 100c, 100d of any damper 200a, 200b, 200c, 200d can be selectively opened in response to e.g., single wheel impact to further improve comfort.

[0077] Fig. 10 shows a schematic illustration of a front set of dampers 200a, 200d and a rear set of dampers 200c, 200b in a second configuration of a hydraulic system of a vehicle. A first hydraulic circuit 211 hydraulically interconnects a rebound chamber of a first damper 200a and a compression chamber of a second damper 200b. A second hydraulic circuit 212 hydraulically interconnects a compression chamber of the first damper 200a and a rebound chamber of the second damper 200b. A third hydraulic circuit 213 hydraulically interconnects a compression chamber of the fourth damper 200d and a rebound chamber of the third damper 200c. A fourth hydraulic circuit 214 hydraulically interconnects a rebound chamber of the fourth damper 200d and a compression chamber of the third damper 200c. Each damper 200a, 200b, 200c, 200d is provided with comfort valve arrangements 100a, 100b, 100c, 10Od according to one embodiment of the disclosure. Although not shown, the damper 200a, 200b, 200c, 200d are adapted with intake valve assemblies. The comfort valve arrangements 100a, 100b, 100c, 100d are externally arranged to a respective damper 200a, 200b, 200c, 200d. The comfort valve arrangements 100a, 100b, 100c, 100d are configurable between an open state and a closed state. The hydraulic system is further provided with a manifold arrangement LDU. The manifold arrangement LDU comprises a first comfort valve CF1 and a second comfort valve CF2 which can be reconfigured between open and closed states. The manifold arrangement comprises a first accumulator A5 and a second accumulator A6. A first side of the manifold arrangement LDU is hydraulically connected to the first hydraulic circuit 211 and the third hydraulic circuit 213. A second side of the manifold arrangement LDU is hydraulically connected to the second hydraulic circuit 212 and the fourth hydraulic circuit 214.

[0078] As an example, in a right turn, the dampers 200d, 200b on the right side will compress, and the dampers 200a, 200c on the left side will extend. Compression of the right side dampers 200d, 200b and extension of the left side dampers 200a, 200c will push circuit fluid from the first hydraulic circuit 21 1 into a first accumulator A1 andcircuit fluid from the third hydraulic circuit 213 into a third accumulator A3 giving a pressure rise and pull circuit fluid from the second accumulator A2 into the second hydraulic circuit 212 and circuit fluid from a fourth accumulator A4 into the fourth hydraulic circuit 214 giving a pressure drop. With the LDU comfort valves CF1 , CF2 open, the fluid pressure in the first hydraulic circuit 211 and the third hydraulic circuit213 will be the same and the fluid pressure in the second hydraulic circuit 212 and the fourth hydraulic circuit 214 will be the same. In this situation, the LDU rods will not move because the LDU bores are of equal area. The pressure difference between the circuits gives a force that resist compression of the right side dampers 200d, 200b and resists extension of the left side dampers 200a, 200c. Thus roll motion is resisted. The accumulators act as roll spring. If there is any braking or accelerating, the LDU comfort valves CF1 , CF2 are commanded to close. With the LDU comfort valves CF1 , CF2 closed in a turn, differing lever rations, rod / bores, and accumulator size and pre-charge between front and rear will try to give different fluid pressure in the first hydraulic circuit 211 and the third hydraulic circuit 213 and different fluid pressure in the second hydraulic circuit 212 and the fourth hydraulic circuit 214. However, any pressure difference generated between the first hydraulic circuit 211 and the third hydraulic circuit 213 and between the second hydraulic circuit 212 and the fourth hydraulic circuit214 will move the LDU rods slightly in an equal but opposite manner. The fluid displaced by the LDU rod motion will reduce any pressure difference between the first hydraulic circuit 211 and the third hydraulic circuit 213 and will reduce any pressure between the second hydraulic circuit 212 and the fourth hydraulic circuit 214. Any small residual pressure difference is due to forces to overcome LDU return springs and friction. Because the LDU rod motion is equal and opposite, the pressure in the two hydraulic circuits in the LDU remain unchanged. The comfort valve arrangement 100a, 100b, 100c, 100d of any damper 200a, 200b, 200c, 200d can be selectively opened in response to e.g., single wheel impact to further improve comfort.

[0079] Fig. 11 shows a method chart of a method according to one embodiment of the disclosure. The method involves controlling a damping fluid flow between a first intermediate chamber 251 A, which first intermediate chamber 251 A is located between a first intake valve body 251 and a divider body 253 in a cylinder of a damper, and a second intermediate chamber 252A, which second intermediate chamber 252A is located between a second intake valve body and a divider body 253, by means of acomfort valve arrangement according to the first aspect or any embodiments thereof. The method comprises the steps of: controlling S1 the comfort valve arrangement to a regulating mode, in which the first pressure dependent valve 120 and the second pressure dependent valve 130 regulate damping fluid flow, and / or controlling S2 the comfort valve arrangement to a disconnected mode, in which the first pressure dependent valve 120 and the second pressure dependent valve 130 are disconnected to permit substantially unregulated damping fluid flow between the first intermediate chamber 251 A and the second intermediate chamber 252A via said valve housing chamber 110A. The method may comprise a step of controlling S3 the comfort valve arrangement to a closed mode, in which the first pressure dependent valve 120 and the second pressure dependent valve 130 are closed to substantially prevent damping fluid flow.

[0080] While the foregoing is directed to embodiments of the disclosure, other and further embodiments may be devised without parting from the inventive concept discussed herein. The scope of the invention is however determined by the claims.

Claims

CLAIMS1 . Comfort valve arrangement for external arrangement to a damper, the damper incorporating an intake valve assembly defining: a first intermediate chamber hydraulically in a first hydraulic line between a first working chamber and a first hydraulic element, and a second intermediate chamber hydraulically in a second hydraulic line between a second working chamber and a second hydraulic element, the comfort valve arrangement comprising:- a valve housing adapted in size and shape to provide a valve housing chamber, wherein the comfort valve arrangement is adapted to connect the valve housing chamber to the first intermediate chamber via a first port, and to connect the valve housing chamber to a second intermediate chamber via a second port, the comfort valve arrangement further comprising:- a first pressure dependent valve adapted to regulate a damping fluid flow between the first intermediate chamber and the valve housing chamber;- a second pressure dependent valve adapted to regulate a damping fluid flow between the second intermediate chamber and the valve housing chamber, wherein the comfort valve arrangement is adapted to be controllable between a regulating mode, in which the first pressure dependent valve and the second pressure dependent valve are positioned to regulate damping fluid flow, and a disconnected mode, in which the first pressure dependent valve and the second pressure dependent valve are disconnected to permit substantially unregulated damping fluid flow.

2. Comfort valve arrangement according to claim 1 , wherein the first pressure dependent valve comprises:- a first valve element adapted to be pressure dependently moveable relative the housing to regulate damping fluid flow between the first intermediate chamber and the valve housing chamber, andthe second pressure dependent valve comprises:- a second valve element adapted to be pressure dependently moveable relative the housing to regulate damping fluid flow between the second intermediate chamber and the valve housing chamber, wherein the first valve element and the second valve element are coupled to one another by means of a coupling means, wherein the comfort valve arrangement is adapted so that a switch between said regulating mode and said disconnected mode includes moving the coupling means in at least a first direction between a regulating mode position and a disconnected mode position.

3. Comfort valve arrangement according to claim 2, wherein said coupling means include a rocker element arranged to pivot about a pivot point, wherein said switch between said regulating mode and said disconnected mode includes moving the pivot point of the rocker element relative the valve housing in said at least a first direction.

4. Comfort valve arrangement according to claim 2, wherein said coupling means include a support element, and the first valve element and the second valve element are adapted to move relative said support element, wherein said switch between said regulating mode and said disconnected mode includes moving the support element relative the valve housing in said at least a first direction.

5. Comfort valve arrangement according to claim 4, further comprising a first spring element arranged between the first valve element and the support element; and / or a second spring element arranged between the second valve element and the support element.

6. Comfort valve arrangement according to claim 2, wherein said coupling means include a resilient disc element, and the first valve element and the second valve element are attached to the resilient disc element, wherein said switch between said regulating mode and said disconnected mode includesmoving the resilient disc element relative the valve housing in said at least a first direction.

7. Comfort valve arrangement according to any of claims 2-6, further comprising a common spring element arranged to bias the coupling means to the regulating mode position or to an intermediate position between the regulating mode position and the disconnected mode position.

8. Comfort valve arrangement according to any of claims 2-7, wherein said at least a first direction includes a direction in a radial direction of the damper during use.

9. Comfort valve arrangement according to any of claims 2-8, wherein said at least a first direction includes a direction in a longitudinal direction of the cylinder during use.

10. Comfort valve arrangement according to any of claims 2-9, wherein said at least a first direction includes a direction in a circumferential direction of the cylinder during use.11 .Comfort valve arrangement according to any of the preceding claims, further comprising an actuator for controlling the comfort valve arrangement between the regulating mode and the disconnected mode.

12. Comfort valve arrangement according to claim 11 , wherein said actuator includes a solenoid device.

13. Comfort valve arrangement according to claim 12, wherein the coupling means is coupled to a plunger of the solenoid device.

14. Comfort valve arrangement according to any of the preceding claims, wherein any one of, or both of, the first pressure dependent valve and the second pressure dependent valve is controllable to a closed state.

15. Damper for a vehicle, said damper comprising:- a cylinder,- an intake valve assembly including a first intake valve body, a second intake valve body, and a divider body, which intake valve assembly is arranged in said cylinder, thereby forming a first damping fluid space between the first intake valve body and the divider body and a second damping fluid space between the divider body and the second intake valve body, and- a comfort valve arrangement according to any preceding claims arranged externally to said cylinder.

16. The damper according to claim 15, further comprising a first control valve for regulating fluid flow to and from a first working chamber and / or a second control valve for regulating fluid flow to and from a second working chamber.

17. The damper according to claim 16, wherein the first control valve and / or the second control valve comprises a solenoid valve, or any combination of a solenoid valve, a fixed restriction, a pressure relief valve, and a check valve.

18. The damper according to any of claims 15-17, wherein the first port and the second port are provided on the cylinder.

19. The damper according to claim 18, wherein the first port and the second port are substantially aligned in a circumferential direction of the damper.

20. The damper according to any of claims 15-19, adapted with a twin tube design.21 .The damper according to any of claims 15-20, adapted for connecting to one or more accumulators.

22. The damper according to any of claims 15-20, adapted with an outer valve casing for defining one or more fluid flow paths between a first control valve and the first intermediate chamber and / or a second control valve and the second intermediate chamber.

23. Hydraulic system for a vehicle, comprising:- a first damper,- a second damper, wherein a first hydraulic circuit hydraulically connects a rebound chamber of a first damper with a compression chamber of a second damper, and a second hydraulic circuit hydraulically connects a compression chamber of the first damper with a rebound chamber of the second damper, the hydraulic system further comprising:- a first accumulator hydraulically connected to the first hydraulic circuit;- a second accumulator hydraulically connected to the second hydraulic circuit,- a first comfort valve arrangement hydraulically connected between the first hydraulic circuit and the second hydraulic circuit;- a second comfort valve arrangement hydraulically connected between the first hydraulic circuit and the second hydraulic circuit, wherein the first comfort valve arrangement and the second comfort valve arrangement are adapted to regulate fluid flow in a pressure dependent manner, wherein the first damper and / or the second damper comprises an intake valve assembly and the first comfort valve arrangement and / or the second comfort valve arrangement is a comfort valve arrangement according to any of claims 1 -14.

24. The hydraulic system according to claim 23, further comprising:- a third damper;- a fourth damper, wherein the first hydraulic circuit hydraulically connects to a rebound chamber of a third damper and a compression chamber of a fourth damper, and the second hydraulic circuit hydraulically connects to a compression chamber of the third damper and a rebound chamber of the fourth damper, the hydraulic system further comprising:- a third accumulator hydraulically connected to the first hydraulic circuit;- a fourth accumulator hydraulically connected to the second hydraulic circuit;- a third comfort valve arrangement hydraulically connected between the first hydraulic circuit and the second hydraulic circuit;- a fourth comfort valve arrangement hydraulically connected between the first hydraulic circuit and the second hydraulic circuit, wherein the third comfort valve arrangement and the fourth comfort valve arrangement are adapted to regulate fluid flow in a pressure dependent manner.

25. The hydraulic system according to claim 23, further comprising:- a third damper;- a fourth damper, wherein a third hydraulic circuit hydraulically connects a rebound chamber of a third damper and a compression chamber of a fourth damper, and a fourth hydraulic circuit hydraulically connects a compression chamber of the third damper and a rebound chamber of the fourth damper, the hydraulic system further comprising:- a third accumulator hydraulically connected to the third hydraulic circuit;- a fourth accumulator hydraulically connected to the fourth hydraulic circuit;- a third comfort valve arrangement hydraulically connected between the third hydraulic circuit and the fourth hydraulic circuit;- a fourth comfort valve arrangement hydraulically connected between the third hydraulic circuit and the fourth hydraulic circuit, wherein the third comfort valve arrangement and the fourth comfort valve arrangement are adapted to regulate fluid flow in a pressure dependent manner.

26. The hydraulic system according to claim 25, further comprising a manifold arrangement hydraulically connected between the first hydraulic circuit, the second hydraulic circuit, the third hydraulic circuit, and the fourth hydraulic circuit.

27. The hydraulic system according to any of claims 24-26, wherein the third damper and / or the fourth damper comprises an intake valve assembly; and the third comfort valve arrangement and / or the fourth comfort valve arrangement is a comfort valve arrangement according to any of claims 1 -14.

28. The hydraulic system according to any of claims 23-27, wherein one or more of the dampers of the hydraulic system is a damper according to any of claims 15-22.

29. The hydraulic system according to any of claims 23-28, further comprising one or more control valves for regulating flow into, and out of, the dampers.

30. Method of controlling a damping fluid flow between a first intermediate chamber, which first intermediate chamber is located between a first intake valve body and a divider body in a cylinder of a damper, and a second intermediate chamber, which second intermediate chamber is located between a second intake valve body and a divider body, by means of a comfort valve arrangement according to any of claims 1 -14, comprising the steps of:- controlling the comfort valve arrangement to a regulating mode, in which the first pressure dependent valve and the second pressure dependent valve regulate damping fluid flow, and / or- controlling the comfort valve arrangement to a disconnected mode, in which the first pressure dependent valve and the second pressure dependent valve are disconnected to permit substantially unregulated damping fluid flow between the first intermediate chamber and the second intermediate chamber via said valve housing chamber.31 . Method according to claim 30, comprising the step of: controlling the comfort valve arrangement to a closed mode, in which the first pressure dependent valve and the second pressure dependent valve are closed to substantially prevent fluid flow.

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