Abstract:
Die vorliegende Erfindung betrifft ein Verfahren zum Regeln eines Betriebsmodus eines Reglers für mindestens eine Fahrwerkskomponente eines zumindest teilweise aktiven Fahrwerks eines Fahrzeugs, bei dem in Abhängigkeit mindestens eines durch einen Nutzer zum Steuern des Fahrzeugs bereitgestellten Steuerbefehls eine Situationserkennung zum Erkennen einer Regelsituation, in der die mindestens eine Fahrwerkskomponente des zumindest teilweise aktiv zu regelnden Fahrwerks potentiell zu regeln ist, durchgeführt wird, und für den Fall, dass eine Regelsituation erkannt wird, mindestens ein reaktiver Regler zum Regeln der mindestens einen Fahrwerkskomponente von einem ersten Betriebsmodus in einen zweiten Betriebsmodus geschaltet wird, wobei der mindestens eine reaktive Regler in den zweiten Betriebsmodus mit einer gegenüber dem ersten Betriebsmodus erhöhten Bandbreite und Verstärkung geschaltet wird, so dass der mindestens eine reaktive Regler in Abhängigkeit einer jeweiligen erkannten Regelsituation gegenüber einem Normalbetrieb mit einer niedrigeren Reaktionszeit regelt.
Abstract:
An air suspension device for vehicle, comprising a first air spring (13) and a second air spring (14) disposed on a chassis frame (12) at the front and rear of an axle (11), an axle housing (17) for holding the axle (11) rotatably on a frame member (16) having a front end connected to the first air spring (13) and a rear end connected to the second air spring (14), an upper rod (21) and a lower rod (22) on end thereof being pivotally supported on the upper and lower parts of the axle housing (17), respectively, and the other end thereof (21, 22) being pivotally supported on the chassis frame (12) at the front and rear of the axle housing (17), respectively, wherein a distance dimension value (A) between the second air spring (14) and the axle (11) is made larger than that (B) between the first air spring (13) and the axle (11), whereby a required strength is decreased so as to reduce the weight of the upper and lower rods and its durability can be increased.
Abstract:
Tandem rear axle air suspensions for trucks and truck-tractors wherein a non-reactive, roll compliant drive axle suspension (5) equipped with wheel slip control is combined with a roll stable, non-drive tag or pusher axle suspension (6) equipped with structure for transferring weight to the drive axle suspension (5). Preferably, the non-drive tag or pusher axle suspension (6) is a rigid beam suspension. The wheel slip control and the weight transfer structure may be either automatically or manually operated.
Abstract:
The invention relates to a hydraulic double-circuit brake system for motor vehicles with a hydraulic high pressure source (5) with a pressure which can be fed via a pedal-operated dosing valve (7) into two brake circuits I and II. The advantage of these brake systems is that one high pressure source is sufficient for any type of braking, i.e. ABS, traction control and standard braking. To achieve active braking in both brake circuits, the high pressure source has to be connectable to the two brake circuits by bypassing the dosing valve (7), while keeping the circuits separate. This is achieved by a valve arrangement (39) which has a check valve in the pressure line (10) from the high pressure source (5) to the brake circuits (I, II), and the pressure line (10) divides into two pressure branches (29, 30) downstream of said valve. The pressure branches are provided with nonreturn valves (31, 32) which prevent return flow of pressure means. It is also possible to provide each pressure branch (29, 30) with a check valve.
Abstract:
This invention relates to a vehicle suspension apparatus interposed between a vehicle body side and each wheel side and having variable damping force characteristics. The apparatus includes a shock absorber (b) which can switch the damping force characteristics on both extension and contraction sides in a plurality of stages by damping force characteristics changing means (a), and capable of being switched to characteristics under which damping coefficient ratio of the extension side to the contraction side is not greater than 1.0, damping force characteristics control means (e) having normal-time control means (d) for variably controlling the damping force characteristics of each shock absorber (b) on the basis of a car behavior detection signal detected by car behavior detecting means (c), and braking-time correction control means (g) provided in the damping force characteristics control means (e), for switching the damping force characteristics changing means (a) of the shock absorber (b) to the characteristics under which the damping coefficient ratio of the extension side to the contraction side is not greater than 1.0, when brake state detection means (f) detects the braking state of the vehicle. The apparatus can ensure a braking force by minimizing variations in ground contact load caused by a vehicle behavior produced by braking.
Abstract:
A vehicle suspension incorporates suspension units (46-48) associated with respective vehicle wheels and selectively controllable to vary the ride height of the vehicle, vehicle speed sensing means, height sensing means responsive to departure of the ride height from a predetermined height datum which is a function of the vehicle speed and to provide a signal related thereto to control movement of at least one suspension unit thereby to tend to move at least a part of the vehicle to said predetermined height datum and timer means whereby the movement of a suspension unit in response to a signal from a height sensor is inhibited until a signal of at least a predetermined magnitude has persisted for at least a prescribed part of a prescribed period of time.
Abstract:
A method and apparatus for dynamically leveling the attitude of a vehicle (102) using a low power fully active suspension system (100). The system (100) connects the front and rear suspensions (114 and 104) and body (103) of the vehicle (102) and includes a hydraulic damper (110) having a pressure cylinder (144) forming a working chamber (146) in which a piston and rod assembly (148) is movably disposed. The system (100) further comprises a flow control device (130) fluidly communicating with the working chamber (146) on one side of the piston (148) for adding and exhausting damping fluid therefrom to a central pressure source (132), and an accumulator (128) fluidly communicating with the working chamber (146) on the opposite side of the piston (148). The system (100) having flow restriction valving (156) for selectively controlling the flow of fluid with said working chamber (146). The flow restriction valving (156) located between the flow control device (130) and the accumulator (128). The low power fully active suspension system (100) is adapted to produce a desired suspension force output through selective actuation of the flow control device (130) and the flow restriction valving (156) for limiting the duty cycle and power requirements of the central pressure source (132).
Abstract:
A hydraulic shock absorber includes a generally vertical cylinder receiving therein hydraulic liquid, a piston working in the cyliner and partioning the interior thereof into two liquid chambers, an upper and a lower chamber. An improved damping control is achieved by a circuit (10) forming a connection between the two liquid chambers (1, 2), a further circuit (9) connecting the reservoir (3) to the lower liquid chamber (2), each of the two circuits (9, 10) including a controllable first check valve (C1) and second check valve (C2), respectively, that can each take two states of operation under the action of a control means (20), in a first state locking the valve in a closed position cutting off the forward flow (E1 and E2 repectively) through the check valve (C1 and C2 respectively), and in a second state allowing a free forward flow (E1 and E2 respectively) through the check valve (C1 and C2 respectively), whereas the check valve (C1, C2) in the first state as well as in the second state block the reverse flow (D1 and D2 respectively) of both circuits (9, 10).
Abstract:
Verfahren zum Betreiben eines Fahrzeugs (1), welches aufweist Radaufhängungen (2), jeweils mit einer Kennlinie (Di), wobei die Kennlinie (Di) jeweils einen Zusammenhang zwischen der an der jeweiligen Radaufhängung (2) anteilig angreifenden Gewichtskraft (Fi) des Fahrzeugs (1) und dem jeweiligen Höhenstand (hi) des Fahrzeugs (1) an der Radaufhängungsstelle (2) herstellt, und mindestens zwei Höhenstandsensoren (3), zum Erfassen der Höhenstände (hi) an den Radaufhängungen (2), wobei den Höhenstandsensoren (3) jeweils ein Referenzhöhenstand (h0i) zugeordnet ist, der repräsentativ für einen vorgegebenen Beladungszustand des Fahrzeugs (1) ist, mit den Schritten: Erfassen der Höhenstände (hi), Ermitteln der am Fahrzeug (1) angreifenden Kräfte (Fx), Ermitteln der Beschleunigung (ax) des Fahrzeugs (1) aufgrund der am Fahrzeug (1) angreifenden Kräfte (Fx), Ermitteln eines Schätzwertes (mx) für die Masse (m) des Fahrzeugs (1) aus den am Fahrzeug (1) angreifenden Kräften (Fx) und der Beschleunigung (ax) des Fahrzeugs (1), und Ermitteln von Werten, die die Referenzhöhenstände (h0i) repräsentieren, aus mindestens dem Schätzwert (mx) für die Masse (m) des Fahrzeugs (1), den Kennlinien (Di) der Radaufhängungen und den erfassten Höhenständen (hi).
Abstract:
Visual information apparatus for real-time demonstration of braking behaviour of a motorcycle, the motorcycle is provided with elastically suspended front wheel and rear wheel (3, 4), independently operable front wheel brake and independently operable rear wheel brake and a visual display device (7). The apparatus is provided with sensors (5, 6) adapted to measure directly or indirectly the momentary forces acting on said elastic suspensions (1, 2) of the front wheel and rear wheel (3, 4) respectively, or to measure indirectly the ratio of said forces; a calculating means adapted to calculate from the signals of said sensors (5, 6) the ratio of said momentary forces acting on said suspensions (1, 2) of said front and rear wheel (3, 4) and to calculate the difference between said ratio and a given value. The visual display device (7) is adapted to display the deviation.