WO2014023506A1 - Lenksystem für eine nachlaufachse eines fahrzeugs - Google Patents
Lenksystem für eine nachlaufachse eines fahrzeugs Download PDFInfo
- Publication number
- WO2014023506A1 WO2014023506A1 PCT/EP2013/064571 EP2013064571W WO2014023506A1 WO 2014023506 A1 WO2014023506 A1 WO 2014023506A1 EP 2013064571 W EP2013064571 W EP 2013064571W WO 2014023506 A1 WO2014023506 A1 WO 2014023506A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wheels
- pump
- trailing axle
- working cylinder
- vehicle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D7/00—Steering linkage; Stub axles or their mountings
- B62D7/06—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins
- B62D7/14—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering
- B62D7/142—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering specially adapted for particular vehicles, e.g. tractors, carts, earth-moving vehicles, trucks
- B62D7/144—Steering linkage; Stub axles or their mountings for individually-pivoted wheels, e.g. on king-pins the pivotal axes being situated in more than one plane transverse to the longitudinal centre line of the vehicle, e.g. all-wheel steering specially adapted for particular vehicles, e.g. tractors, carts, earth-moving vehicles, trucks for vehicles with more than two axles
Definitions
- the present invention relates to the technical field of the steering systems and more particularly to a steering system for a trailing axle of a vehicle according to claim 1 and a corresponding method for steering a vehicle according to claim 7.
- NLA trailing axles
- a steerable NLA is often installed.
- the NLA can thereby be forcibly steered or adhesion-controlled, ie steered by the return movement of the wheels themselves.
- This additional NLA steering allows for smaller curve radii, resulting in greater maneuverability.
- the slip angle on the tire is reduced, which reduces tire wear on the tire Vehicle is reduced.
- NLA active steering of the NLA is desired only at low speeds. At higher vehicle speeds, no steering of the NLA is desired, as this negatively affects stable driving.
- the NLA must be fixed at a certain vehicle-dependent speed, so as not to cause an unstable driving condition.
- the state of the art is that the NLA is articulated via a hydraulic cylinder.
- the oil is pumped into one or the other cylinder chamber via a pump that is driven by the internal combustion engine, depending on how the valves are switched.
- German patent application DE 103 51 4S2 AI shows a steering system in which a hydraulic hinged vehicle rear axle is held with an additional locking device in the current position or hinged back to a center position and then arrested adhesion-controlled.
- this requires more components and is therefore expensive;
- a lot of space is needed.
- the pump is also flanged to the internal combustion engine, so that it is always operated. Therefore, especially in the straight-ahead driving, in which the vehicle is a long time, the hydraulic pump would be constantly driven, although this is not required. In this operating condition, the hydraulics generate losses that are not countered by added value. This is contrary to the demand for a lower fuel consumption of the vehicle.
- German patent application DE 10 2006 008 436 AI shows a mechanically coupled multi-axle steering system, in which only a steering force is applied to the additional steering axle, if this is active - ie when steering lock - is needed.
- this system can only be implemented with great effort for a rear-axle steering, which is to be locked in straight ahead driving from a certain speed range.
- German patent DE 4414161 Cl a multi-axle steering system is described, in which a master cylinder is controlled. Depending on the position of the master cylinder on the front axle, the slave cylinder reacts on the rear axle.
- a disadvantage of this system is the direct dependence on the respective position of the master cylinder. Thus, there is no possibility of a speed-dependent influence on the rear axle with this system.
- the object of the present invention is to provide a steering system for a trailing axle of a vehicle, which takes into account as fully as possible its current driving state, which operates energy-efficiently and reliably, and which is simple and inexpensive to implement.
- a steering system for at least one trailing axle of a vehicle, comprising: a steering angle sensor for detecting a steering angle of wheels of a front axle of the vehicle; a vehicle speed sensor for detecting a vehicle speed; an electric motor for driving a hydraulic pump, which in turn is connected to at least one working cylinder for articulating the wheels of the trailing axle; a control unit, which on the one hand communicates with or communicates with the steering angle sensor and the vehicle speed sensor, and on the other hand with the electric motor, and is adapted to determine from the steering angle and the vehicle speed a caster angle of wheels on the trailing axle of the vehicle, and based on this caster angle to switch the engine, wherein a piston in the working cylinder has a permanent magnet which is movable relative to a solenoid valve which is connected in a straight-ahead position of the wheels of the trailing axle of the permanent magnet in a working position in the exchange of hydraulic fluid to prevented the working cylinder and the piston is blocked in the straight-ahead position of
- an electro-hydraulic steering system for a trailing axle available, in which the steering wheel is not mechanically connected to the axis to be steered, ie its articulation of the trailing axle can take place independently of the front axle.
- this system is decoupled from the internal combustion engine, so that on the one hand a needs-based control and on the other hand - by the few and also freely placeable components - a high spatial flexibility is ensured during its installation. At low speeds and when stationary, this system enables active steering depending on the steering angle of the front axle and on the driving speed.
- the wheels of the trailing axle even at a failure of the electronics and / or the pump at any time automatically, ie brought adhesion driven from each deflection angle in their straight-ahead and there reliably blocked, without the need for additional electronics and / or a hydraulic drive would be necessary.
- the hydraulic fluid In the adhesion-driven movement of the piston in the direction of its center position, the hydraulic fluid is discharged from the cylinder chamber of the working cylinder, while in the other cylinder chamber - without pump insert - liquid is sucked. Once the permanent magnet switches the solenoid valve, its further movement is blocked by the hydraulic fluid locked on both sides, so that the wheels of the trailing axle safely in their Held straight ahead.
- a trailing axle should be understood to mean any axle which follows the deflection of a steered axle and which can be arranged behind or ahead of a rigid rear or front axle, ie also as a leading axle.
- the steering system comprises at least one control valve which is arranged in a hydraulic line between the working cylinder and the pump, and which in a basic position prevents fluid flow between the working cylinder and the pump, and in a working position, a fluid flow between the Working cylinder and the pump releases, wherein in the basic position of the at least one control valve and a basic position of the solenoid valve, a compensation line is open, which allows an exchange of hydraulic fluid to the working cylinder, so that the piston is adhesion driven to its middle position movable, in which the solenoid valve is switched, and the wheels of the trailing axle are blocked in a straight-ahead position.
- the at least one control valve can be held, for example, spring-driven in its closed basic position and moved by the action of an electromagnet in its open working position. In case of failure of the pump, for example, the system can be switched to a safe state by this circuit of the valves. If the solenoid valve is in its normal position, for example, in a trouble-free operating control valve and deflected wheels of the trailing axle, the compensation line is closed, which allow ahHosionsgetriebene movement of the piston, and the piston is movable only via the pump.
- the at least one control valve goes into its de-energized basic position, no movement of the piston by means of the pump longer possible, and it is made a compensation line that allows the piston an adhesion-driven displacement of hydraulic fluid until it Center position achieved.
- the solenoid valve is switched via the permanent magnet in its normal position and prevents an exchange of hydraulic fluid on the cylinder and the compensation line.
- the control unit can advantageously be designed to switch the at least one control valve deenergized when a predeterminable driving speed is exceeded.
- the trailing axle is driven from a certain presettable speed in its center position and held there, so that their wheels are in straight-ahead driving position. Since this center position can be maintained without further energy consumption, the power consumption of the system is minimal.
- the at least one working cylinder can be designed as a single-acting cylinder whose hydraulic line to the pump requires only one control valve.
- the at least one working cylinder can also be designed as a double-acting cylinder or as a double-acting combination of two individual cylinders, which results in an improved power transmission, and at the same time a spatially flexible shoring is possible.
- a respective control valve is used to allow or to prevent an exchange of hydraulic fluid at each cylinder space.
- the volume compensation of different cylinder chambers of the at least one cylinder is preferably carried out via a combination of a 2-pressure valve and a fluid tank.
- a hydraulic fluid can be sucked in and conveyed, in order to effect a corresponding fluid compensation.
- the hydraulic fluid can be sucked in via the intake valves or the hydraulic fluid can be pumped back into the tank.
- two cylinders are used with identical volumes of the cylinder chambers, which does not necessarily a fluid tank is needed.
- the pump is a reversibly operable pump or a combination of a one-way operable pump with a valve block executed.
- a reversibly operable pump makes the least demands on the space requirements of the steering system, while a one-way operable pump can be operated with a simpler electric drive.
- the at least one control valve can in principle be actuated electromagnetically and / or hydraulically in order to ensure high reliability.
- the above object is also achieved by a method for steering wheels of at least one trailing axle of a vehicle, in which a driving speed and a steering angle of wheels of a front axle of the vehicle are detected and from a caster angle of the wheels of the trailing axle is determined, the wheels of the trailing axle be articulated via a working cylinder having a permanent magnet which is connected to the piston and which is moved relative to a solenoid valve, and in a straight-ahead position of the wheels of the trailing axle switches a solenoid valve, which prevents an exchange of hydraulic fluid to the working cylinder, and the piston is blocked in the straight-ahead position of the wheels of the trailing axle.
- each articulated to the current driving situation articulation of the trailing axle is possible, which also opens energy saving potential and guarantees high reliability.
- a simple and reliable mechanical return of the wheels of a trailing axle in their straight-ahead position is possible, i. even if there is a fault in the pump and / or electrical system.
- At least one control valve is arranged in a hydraulic line between the working cylinder and the pump, which in a basic position prevents fluid flow between the working cylinder and the pump, and which releases a fluid flow between the working cylinder and the pump in a working position , where in the Starting position of the at least one control valve and a basic position of the solenoid valve, a compensation line is opened, which allows an exchange of hydraulic fluid to the working cylinder, so that the piston is driven adhesion driven to its center position and then the solenoid valve is switched, and the wheels of the trailing axle in a straight ahead position are blocked.
- the steering system according to the invention should preferably be used in a commercial vehicle, in particular in a truck or a coach.
- FIG. 1 is a functional diagram of a vehicle with an inventive
- FIG 2 is the functional diagram of the steering system according to the invention of Figure 1.
- FIG. 1 shows a functional diagram of a vehicle F with a first steering system according to the invention L.
- a front axle Av here is a steering angle sensor Sa
- a vehicle speed sensor Sv for detecting a vehicle speed v is provided a vehicle speed sensor Sv.
- Their signals are transmitted via a signal line Wl a control unit C, which is designed for driving an electric motor M and thus directly operated reversible hydraulic pump P.
- the steering angle ⁇ can alternatively or additionally also picked up directly on the steering wheel and transmitted via a signal line W2 to the control unit C.
- the control unit C is connected via a signal line W3 to a position sensor Sl of a double-acting cylinder Z, which can move the wheels Rn of a trailing axle An of the vehicle F in a caster angle ß.
- the system L is driven by the motor M only when active steering is required.
- the reversibly operable pump P it is possible to pump an oil flow in the direction of one or the other cylinder chamber of the cylinder Z.
- the exporting cylinder Z is here a double-acting cylinder, which can also be designed as a synchronous or differential cylinder.
- a compensation line X3 between the two cylinder chambers of the cylinder Z is opened, which allows an exchange of oil, so that an adhesion-driven movement of the piston K is possible until the permanent magnet B the solenoid valve VI in its closed working position AI (piston K in the center position G) switches and thus this compensation line X3 closes.
- active steering control valves V2, V3, however, are switched to a powered, open working position A2, A3 to open lines XI, X2 between the pump P and the corresponding cylinder chamber, and to separate the compensation line X3 between the two cylinder chambers.
- FIG. 2 shows the functional diagram of the steering system L of FIG. 1 on a larger scale.
- the electric motor M can remain switched off and the axis At remains hydraulically, since the control valves V2, V3 are de-energized and the solenoid valve B is switched to a closed working position AI.
- the motor M If there is a failure of the steering system L, e.g. by a fault of the electric motor M, the steering angle and / or vehicle speed sensor Sa, Sv or the control unit C, the motor M is turned off and the control valves V2, V3, e.g. Federgetrieben converted into a de-energized, closed basic position N2, N3.
- the valve B switches magnetically, depending on the position of the piston K, to initiate a safe state, that is, to keep the trailing axle An in the straight-ahead position of the wheels Rn as follows.
- a valve control D such as a respective solenoid of a control valve V2, V3 is de-energized, whereby the respective valve V2, V3, for example, spring-driven its no-current, closed basic position N2, N3 occupies.
- the pump P is hydraulically separated from the cylinder chambers. If the trailing axle is deflected at, the axle forces act according to the radius of curvature on the wheels Rn, which push so adhäsionsgetrieben in a straight-ahead driving position.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
- Vehicle Body Suspensions (AREA)
- Steering-Linkage Mechanisms And Four-Wheel Steering (AREA)
Description
Claims
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201380049525.8A CN104661899B (zh) | 2012-08-06 | 2013-07-10 | 用于车辆后从动轴的转向系统 |
| BR112015002514A BR112015002514A2 (pt) | 2012-08-06 | 2013-07-10 | sistema de direção para um eixo de arraste de um veículo. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012107177.2 | 2012-08-06 | ||
| DE102012107177.2A DE102012107177B4 (de) | 2012-08-06 | 2012-08-06 | Lenksystem für eine Nachlaufachse eines Fahrzeugs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2014023506A1 true WO2014023506A1 (de) | 2014-02-13 |
Family
ID=48748268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2013/064571 Ceased WO2014023506A1 (de) | 2012-08-06 | 2013-07-10 | Lenksystem für eine nachlaufachse eines fahrzeugs |
Country Status (4)
| Country | Link |
|---|---|
| CN (1) | CN104661899B (de) |
| BR (1) | BR112015002514A2 (de) |
| DE (1) | DE102012107177B4 (de) |
| WO (1) | WO2014023506A1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20240166257A1 (en) * | 2021-04-08 | 2024-05-23 | Scania Cv Ab | Control device and method for controlling a tag axle steering system |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102012107777B4 (de) | 2012-08-23 | 2023-04-27 | Robert Bosch Gmbh | Lenksystem für eine nachlaufachse eines fahrzeugs |
| DE102015120131B4 (de) | 2015-11-20 | 2023-06-01 | Robert Bosch Gmbh | Lenksystem zum Betreiben eines Lenksystems |
| DE102017204853A1 (de) * | 2016-11-28 | 2018-05-30 | Hans-Jürgen Schulze | Mehrspuriges Kraftfahrzeug |
| JP7774039B2 (ja) * | 2020-07-21 | 2025-11-20 | ヴエーバー - ヒドラウリク ゲー エム ベー ハー | 油圧式後軸操舵装置 |
| CN111942469A (zh) * | 2020-08-20 | 2020-11-17 | 江苏徐工工程机械研究院有限公司 | 工程车辆的转向系统和挖掘装载机 |
| CN114684256B (zh) * | 2020-12-30 | 2023-07-11 | 比亚迪股份有限公司 | 转向制动系统及具有其的车辆 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1035142B (de) | 1955-06-03 | 1958-07-31 | Ici Ltd | Verfahren zur Herstellung von diquartaeren Salzen von Pyrimidylaminochinolinabkoemmlingen |
| DE4414161C1 (de) | 1994-04-22 | 1995-11-02 | Zahnradfabrik Friedrichshafen | Mehrachslenkanlage für Fahrzeuge |
| EP0930218A2 (de) * | 1998-01-17 | 1999-07-21 | MAN Nutzfahrzeuge Aktiengesellschaft | Schwerlastkraftwagen mit wenigstens zwei Vorderachsen mit lenkbaren Rädern |
| EP1529717A2 (de) * | 2003-11-04 | 2005-05-11 | ZF Lenksysteme GmbH | Blockiervorrichtung für eine hydraulische Fahrzeug-Hinterachslenkung |
| WO2007122102A1 (de) * | 2006-04-20 | 2007-11-01 | Zf Lenksysteme Gmbh | Hilfskraftlenksystem für fahrzeuge |
| DE102006008436A1 (de) | 2006-02-23 | 2007-11-08 | Zf Lenksysteme Gmbh | Mehrachslenkungsanlage |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19819404C2 (de) | 1998-04-30 | 2000-03-02 | Daimler Chrysler Ag | Lenkvorrichtung |
| JP4156444B2 (ja) * | 2003-06-02 | 2008-09-24 | 株式会社 神崎高級工機製作所 | 油圧式操舵機構 |
| DE102008013915A1 (de) * | 2008-03-12 | 2009-09-17 | Jungheinrich Ag | Flurförderzeug, insbesondere Staplerfahrzeug |
-
2012
- 2012-08-06 DE DE102012107177.2A patent/DE102012107177B4/de active Active
-
2013
- 2013-07-10 CN CN201380049525.8A patent/CN104661899B/zh active Active
- 2013-07-10 WO PCT/EP2013/064571 patent/WO2014023506A1/de not_active Ceased
- 2013-07-10 BR BR112015002514A patent/BR112015002514A2/pt not_active IP Right Cessation
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1035142B (de) | 1955-06-03 | 1958-07-31 | Ici Ltd | Verfahren zur Herstellung von diquartaeren Salzen von Pyrimidylaminochinolinabkoemmlingen |
| DE4414161C1 (de) | 1994-04-22 | 1995-11-02 | Zahnradfabrik Friedrichshafen | Mehrachslenkanlage für Fahrzeuge |
| EP0930218A2 (de) * | 1998-01-17 | 1999-07-21 | MAN Nutzfahrzeuge Aktiengesellschaft | Schwerlastkraftwagen mit wenigstens zwei Vorderachsen mit lenkbaren Rädern |
| EP1529717A2 (de) * | 2003-11-04 | 2005-05-11 | ZF Lenksysteme GmbH | Blockiervorrichtung für eine hydraulische Fahrzeug-Hinterachslenkung |
| DE102006008436A1 (de) | 2006-02-23 | 2007-11-08 | Zf Lenksysteme Gmbh | Mehrachslenkungsanlage |
| WO2007122102A1 (de) * | 2006-04-20 | 2007-11-01 | Zf Lenksysteme Gmbh | Hilfskraftlenksystem für fahrzeuge |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20240166257A1 (en) * | 2021-04-08 | 2024-05-23 | Scania Cv Ab | Control device and method for controlling a tag axle steering system |
| US12473021B2 (en) * | 2021-04-08 | 2025-11-18 | Scania Cv Ab | Control device and method for controlling a tag axle steering system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104661899B (zh) | 2016-08-24 |
| DE102012107177A1 (de) | 2014-05-22 |
| CN104661899A (zh) | 2015-05-27 |
| DE102012107177B4 (de) | 2021-12-23 |
| BR112015002514A2 (pt) | 2018-05-22 |
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