DE102008019170A1 - Hybrid steering system for motor vehicle, has electrical steering device which comprises electric motor for driving steering rod, and has control valve for operating hydraulic actuator - Google Patents
Hybrid steering system for motor vehicle, has electrical steering device which comprises electric motor for driving steering rod, and has control valve for operating hydraulic actuator Download PDFInfo
- Publication number
- DE102008019170A1 DE102008019170A1 DE200810019170 DE102008019170A DE102008019170A1 DE 102008019170 A1 DE102008019170 A1 DE 102008019170A1 DE 200810019170 DE200810019170 DE 200810019170 DE 102008019170 A DE102008019170 A DE 102008019170A DE 102008019170 A1 DE102008019170 A1 DE 102008019170A1
- Authority
- DE
- Germany
- Prior art keywords
- bypass
- hydraulic
- hydraulic fluid
- steering
- pump
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/065—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/088—Characterised by the construction of the motor unit the motor using combined actuation, e.g. electric and fluid actuation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/30—Directional control
- F15B2211/31—Directional control characterised by the positions of the valve element
- F15B2211/3122—Special positions other than the pump port being connected to working ports or the working ports being connected to the return line
- F15B2211/3127—Floating position connecting the working ports and the return line
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Power Steering Mechanism (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft ein hybrides Lenksystem für ein Kraftfahrzeug.The The present invention relates to a hybrid steering system for a motor vehicle.
Ein hybrides Lenksystem umfasst eine elektrische Lenkhelfeinrichtung, die einen Elektromotor zum Antreiben einer Lenkstange aufweist, sowie eine hydraulische Lenkhelfeinrichtung, die einen hydraulischen Aktuator zum Antreiben der Lenkstange umfasst.One hybrid steering system comprises an electric power steering device, having an electric motor for driving a handlebar, and a hydraulic Lenkhelfeinrichtung that a hydraulic Includes actuator for driving the handlebar.
Aus
der
Bei einem hybriden Lenksystem besteht die Möglichkeit, bei bestimmten Fahrzuständen, wie zum Beispiel Autobahnfahrt und Landstraßenfahrt, die hydraulische Lenkkraftunterstützung zu deaktivieren. Sofern eine weitere Lenkkraftunterstützung erforderlich sein sollte, kann diese dann elektrisch bereitgestellt werden. Da die Pumpe zweckmäßig permanent von der Brennkraftmaschine des Fahrzeugs angetrieben wird, kann zum Deaktivieren der hydraulischen Lenkkraftunterstützung ein Bypass vorgesehen sein, der die Pumpe kurzschließt und der mit Hilfe eines Bypassventils gesteuert werden kann. Es hat sich jedoch gezeigt, dass bei deaktivierter hydraulischer Lenkkraftunterstützung das im Bypass geförderte Hydraulikmittel Wärme aufnimmt, wobei die Gefahr einer Überhitzung entsteht.at a hybrid steering system is possible with certain driving conditions, such as highway driving and highway driving, the hydraulic power steering to disable. If another steering power assistance should be required, this can then be provided electrically become. Since the pump expedient permanently from the internal combustion engine of the vehicle is driven, can Disable the hydraulic power steering assist Bypass be provided, which shorts the pump and which can be controlled by means of a bypass valve. It has However, shown that with deactivated hydraulic power steering the hydraulic fluid conveyed in the bypass heat absorbs the risk of overheating.
Die vorliegende Erfindung beschäftigt sich mit dem Problem, für ein hybrides Lenksystem der eingangs genannten Art eine verbesserte Ausführungsform anzugeben, die sich insbesondere dadurch charakterisiert, dass die Gefahr einer Überhitzung des Hydraulikmittels bei deaktivierter hydraulischer Lenkkraftunterstützung reduziert ist.The The present invention addresses the problem of for a hybrid steering system of the type mentioned to provide an improved embodiment, in particular characterized by the risk of overheating the hydraulic means with deactivated hydraulic steering power assistance is reduced.
Dieses Problem wird erfindungsgemäß durch den Gegenstand des unabhängigen Anspruchs gelöst. Vorteilhafte Ausführungsformen sind Gegenstand der abhängigen Ansprüche.This Problem is inventively by the subject of the independent claim. advantageous Embodiments are the subject of the dependent Claims.
Die Erfindung beruht auf dem allgemeinen Gedanken, die Hydraulikmittelmenge, die bei deaktivierter hydraulischer Lenkkraftunterstützung den Bypass durchströmt, durch eine entsprechende Ansteuerung des Bypassventils zeitabhängig und/oder temperaturabhängig zu reduzieren. Eine Reduzierung der den Bypass durchströmenden Hydraulikmittelmenge führt bei gleicher Förderleistung der Pumpe zwangsläufig zu einer Erhöhung der im übrigen Hydraulikkreis geförderten Hydraulikmittelmenge. In diesem übrigen Hydraulikkreis, also insbesondere im Hydraulikmittelvorrat, in den Hydraulikleitungen sowie im Aktuator, ruht das Hydraulikmittel bei deaktivierter hydraulischer Lenkkraftunterstützung und kann sich dementsprechend abkühlen. Durch die erfindungsgemäß vorgeschlagene Reduzierung der den Bypass durchströmenden Hydraulikmittelmenge kommt es automatisch zu einer Durchmischung des im Bypass geförderten Hydraulikmittels mit dem im übrigen Hydraulikkreis vorhandenen Hydraulikmittel. In der Folge kann die Temperatur in dem im Bypass geförderten Hydraulikmittel gesenkt werden.The Invention is based on the general idea, the amount of hydraulic fluid, the with deactivated hydraulic power steering flows through the bypass, by a corresponding control of the bypass valve time-dependent and / or temperature-dependent to reduce. A reduction of the bypass flowing through Hydraulic fluid quantity leads at the same delivery rate the pump inevitably to an increase in the rest Hydraulic circuit promoted amount of hydraulic fluid. In this rest Hydraulic circuit, ie in particular in the hydraulic fluid reservoir, in the Hydraulic lines and in the actuator, the hydraulic fluid rests at deactivated hydraulic power steering and can cool down accordingly. By the invention proposed Reduction of the amount of hydraulic fluid flowing through the bypass comes It automatically causes a mixing of the bypass Hydraulic fluid with the existing in the rest of the hydraulic circuit Hydraulic fluid. As a result, the temperature in the conveyed in the bypass Hydraulic fluid can be lowered.
Durch die vorgeschlagene Maßnahme kann somit eine Beschädigungsgefahr des Lenksystems durch Überhitzung des Hydraulikmittels effektiv vermieden werden.By the proposed measure can thus be a risk of damage of the steering system due to overheating of the hydraulic fluid effectively avoided.
Entsprechend einer vorteilhaften Ausführungsform kann eine Steuereinrichtung, die zur Betätigung des Bypassventils vorgesehen ist, bei deaktivierter hydraulischer Lenkkraftunterstützung in vorbestimmten Zeitabständen für eine vorbestimmte Zeit das Bypassventil zum Reduzieren der durch den Bypass durchströmenden Hydraulikmittelmenge ansteuern. In Versuchen können im Vorfeld geeignete Zeitabstände und geeignete Zeitdauern sowie geeignete Öffnungsweiten für das Bypassventil ermittelt werden, die dann bei deaktivierter hydraulischer Lenkkraftunterstützung automatisch realisiert werden.Corresponding In an advantageous embodiment, a control device, which is provided for actuating the bypass valve, at deactivated hydraulic power steering in predetermined Time intervals for a predetermined time the bypass valve for reducing the amount of hydraulic fluid flowing through the bypass drive. Trials may be preceded by appropriate time intervals and suitable time periods and suitable opening widths be determined for the bypass valve, which then disabled Hydraulic power steering automatically realized become.
Zusätzlich oder alternativ ist es gemäß einer anderen Ausführungsform möglich, den Bypass einen mit der Steuereinrichtung gekoppelten Temperatursensor zuzuordnen, wobei dann die Steuereinrichtung bei deaktivierter hydraulischer Lenkkraftunterstützung in Abhängigkeit der gemessenen Temperatur des Hydraulikmittels im Bypass das Bypassventil zum Reduzieren der den Bypass durchströmenden Hydraulikmittelmenge ansteuert. Dies kann insbesondere so realisiert werden, dass das Hydraulikmittel im Bypass eine vorbestimmte Grenztemperatur nicht übersteigt.additionally or alternatively it is according to another embodiment possible, the bypass one coupled to the controller Assign temperature sensor, in which case the controller at deactivated hydraulic steering assistance in dependence the measured temperature of the hydraulic fluid in the bypass the bypass valve to Reduce the amount of hydraulic fluid flowing through the bypass controls. This can be realized in particular so that the Hydraulic fluid in the bypass does not exceed a predetermined limit temperature.
Weitere wichtige Merkmale und Vorteile der Erfindung ergeben sich aus den Unteransprüchen, aus der Zeichnung und aus der zugehörigen Figurenbeschreibung anhand der Zeichnung.Further important features and advantages of the invention will become apparent from the Subclaims, from the drawing and from the associated Description of the figures with reference to the drawing.
Es versteht sich, dass die vorstehend genannten und die nachstehend noch zu erläuternden Merkmale nicht nur in der jeweils angegebenen Kombination, sondern auch in anderen Kombinationen oder in Alleinstellung verwendbar sind, ohne den Rahmen der vorliegenden Erfindung zu verlassen.It it is understood that the above and the following yet to be explained features not only in each case specified combination, but also in other combinations or can be used in isolation, without the scope of the present To leave invention.
Bevorzugte Ausführungsbeispiele der Erfindung sind in der Zeichnung dargestellt und werden in der nachfolgenden Beschreibung näher erläutert.preferred Embodiments of the invention are in the drawing and will become more apparent in the following description explained.
Die
einzige
Entsprechend
Im
Unterschied dazu umfasst die hydraulische Lenkhelfeinrichtung
Der
Aktuator
Das
Bypassventil
Die
Steuereinrichtung
Bei
diesem Betrieb des Lenksystems
Hierdurch
kann ein Teil des von der Pumpe
Gemäß einer
besonders einfachen Ausführungsform kann die Steuereinrichtung
Bei
einer anderen Ausführungsform kann im Bypass
Entsprechend
einer besonders vorteilhaften Ausführungsform kann der
Bypass
Es
ist klar, dass bei einer besonderen Ausführungsform die
temperaturabhängige Betätigung des Bypassventils
ZITATE ENTHALTEN IN DER BESCHREIBUNGQUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- - DE 10239143 A1 [0003] - DE 10239143 A1 [0003]
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200810019170 DE102008019170A1 (en) | 2008-04-17 | 2008-04-17 | Hybrid steering system for motor vehicle, has electrical steering device which comprises electric motor for driving steering rod, and has control valve for operating hydraulic actuator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200810019170 DE102008019170A1 (en) | 2008-04-17 | 2008-04-17 | Hybrid steering system for motor vehicle, has electrical steering device which comprises electric motor for driving steering rod, and has control valve for operating hydraulic actuator |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102008019170A1 true DE102008019170A1 (en) | 2008-11-27 |
Family
ID=39877347
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE200810019170 Withdrawn DE102008019170A1 (en) | 2008-04-17 | 2008-04-17 | Hybrid steering system for motor vehicle, has electrical steering device which comprises electric motor for driving steering rod, and has control valve for operating hydraulic actuator |
Country Status (1)
Country | Link |
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DE (1) | DE102008019170A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108248677A (en) * | 2016-12-28 | 2018-07-06 | 株式会社捷太格特 | Vehicle steering apparatus |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10239143A1 (en) | 2002-08-27 | 2004-03-18 | Daimlerchrysler Ag | Steering assistance device for motor vehicles has an assistance pump with a hydraulic circuit and rotary slide valve with steering cylinder and a control valve to adjust hydraulic volume flow |
-
2008
- 2008-04-17 DE DE200810019170 patent/DE102008019170A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10239143A1 (en) | 2002-08-27 | 2004-03-18 | Daimlerchrysler Ag | Steering assistance device for motor vehicles has an assistance pump with a hydraulic circuit and rotary slide valve with steering cylinder and a control valve to adjust hydraulic volume flow |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108248677A (en) * | 2016-12-28 | 2018-07-06 | 株式会社捷太格特 | Vehicle steering apparatus |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OAV | Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1 | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee | ||
R119 | Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee |
Effective date: 20141101 |