US20050196308A1 - Hydraulic power steering system for motor vehicles - Google Patents
Hydraulic power steering system for motor vehicles Download PDFInfo
- Publication number
- US20050196308A1 US20050196308A1 US11/064,387 US6438705A US2005196308A1 US 20050196308 A1 US20050196308 A1 US 20050196308A1 US 6438705 A US6438705 A US 6438705A US 2005196308 A1 US2005196308 A1 US 2005196308A1
- Authority
- US
- United States
- Prior art keywords
- valve
- steering system
- hydraulic power
- power steering
- vane cell
- 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.)
- Abandoned
Links
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 230000007246 mechanism Effects 0.000 claims description 3
- 230000004913 activation Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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
- B62D5/062—Details, component parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
- B62D6/02—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits responsive only to vehicle speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/70—Safety, emergency conditions or requirements
- F04C2270/701—Cold start
Definitions
- the invention relates to a hydraulic power steering system for motor vehicles according to the preamble of claim 1 .
- Power steering systems of the abovementioned type are known from DE 42 20 624 A1 and are provided, in the junction from the high pressure pump to the steering valve, with a flow valve whose opening cross section, in order to change the booster effect across the vehicle speed, can be varied via an appropriately activated, electromagnetic actuator.
- DE 195 29 807 A1 has disclosed a vane cell pump, downstream of which on the delivery side there is arranged a 3-way flow regulating valve which opens the delivery to the consumer only when a certain minimum pressure is present. This is intended to improve the cold start behavior of the vane cell pump. It is assumed here that sufficient delimitation of the working spaces with respect to one another is not achieved and therefore short circuit effects occur under cold start conditions as a result of insufficient radial pressure loading. The delivery capacity is reduced as a result and the disadvantage of the reduced delivery capacity and of the slower build-up of pressure as a result are to be compensated for by the outflow path on the delivery side being closed by the flow regulating valve.
- the flow regulating valve configured with regard to this is complicated in construction terms.
- the invention is based on the object of configuring a hydraulic steering system of the type mentioned in the introduction in such a way that said hydraulic steering system satisfies the increased comfort requirements, to be precise with low energy input and without increased structural complexity.
- a vane cell pump which is distinguished by low pulsation and favorable noise behavior being used as fixed displacement high pressure pump.
- a flow valve which can be acted on by an electromagnetic actuator is provided connected downstream of the vane cell pump, which flow valve, in conjunction with a pressure relief valve connected in between, easily makes it possible to adapt the delivery amount to the requirement needed for power assistance as a function of driving conditions and driving behavior, it being additionally possible, according to the invention, for the flow valve to be activated via the electromagnetic actuator during cold start operation in such a way that the pressure in the vane cell pump builds up as quickly as possible.
- the invention therefore advantageously combines the utilization of the flow valve to minimize the energy consumption and for improved cold start operation with a corresponding reduction in wear, this combination not requiring any structural outlay and substantially being based on the utilization of data recorded anyway for vehicle operation, with an appropriate software link.
- the flow valve in the solution according to the invention can be configured as a throttling valve, the closing direction of the throttling valve preferably corresponding to the direction of throughflow.
- the closing direction of the throttling valve preferably corresponding to the direction of throughflow.
- the electromagnetic actuator is activated under parameters defining cold start conditions in order to take cold start operation into consideration, said parameters usually being recorded during vehicle operation including internal combustion engine operation and it being possible to call them up both individually and linked to one another, it being possible to record as cold start parameters, in particular, the engine temperature, the outside temperature, the rotational speed of the engine, the standstill time of the engine and also further parameters, however.
- FIG. 1 showing a diagrammatic representation of a hydraulic power steering system according to the invention
- FIG. 2 showing a section through a flow valve configured as a throttling valve, as is to be used advantageously within the scope of the invention.
- FIG. 1 of the hydraulic power steering system 1 according to the invention denotes the vane cell pump which is configured as a fixed displacement pump, is fed from a storage vessel 3 and delivers to a steering valve 4 , downstream of which there is arranged an actuating device for the steering mechanism 5 unless it is integrated into the steering valve 4 .
- the connections which lead from the steering mechanism 5 to the wheels are indicated at 6 .
- the connection of the steering valve 4 to the steering wheel (not shown) is indicated by a steering shaft 7 (shown diagrammatically).
- An expanding tube 8 lies in the connection of the vane cell pump 2 to the steering valve 4 as a pressure store and/or an element which damps pulses, and, furthermore, a flow valve 9 is arranged adjacent to the vane cell pump 2 , said flow valve 9 being assigned an electromagnetic actuator 10 , as shown in greater detail in FIG. 2 .
- a pressure relief valve 12 which is connected to the suction line 13 of the pump 2 via a line section 14 .
- the pressure relief valve 12 is pressure controlled, to be precise as a function of the pressure prevailing in the line connection 15 between the flow valve 9 and steering valve 4 , as indicated by the dash-dotted line 16 .
- the return from the steering valve 4 to the storage vessel 3 takes place via a line 17 in which a cooler 18 is arranged.
- a steering speed sensor 38 is indicated diagrammatically, by which the rotary speed of the steering shaft 7 is tapped off
- a speed sensor 19 is indicated diagrammatically, by which the driving speed of the vehicle is recorded and which may be formed, for example, by the speedometer of the vehicle.
- the respectively recorded signals are processed in a control unit 20 , the connection being produced via what is referred to as a CAN bus 21 , as indicated diagrammatically.
- Further control parameters which identify cold start operation of the vane cell pump and which are usually recorded anyway in conjunction with other vehicle functions are preferably processed by the control unit 20 .
- the supply of current to the actuator 10 is controlled by the control unit 20 , the battery or some other current connection in the vehicle being provided, for example, as current source 22 and the line connections 23 leading from the control unit 20 to the actuator.
- a valve housing 24 is provided in which the inlet connection on the pump side is denoted by 25 and the connection which leads to the steering valve 4 is denoted by 26 .
- the opening cross section 28 which is controlled via the throttling member 27 of the flow valve 9 configured as a throttling valve and into which the widened throttling head 29 of the throttling member 27 engages, the guide rod 30 being attached to said throttling head 29 .
- the guide rod 30 extends as far as the region of the winding 31 of the electromagnetic actuator 10 and has an armature 32 in this end region.
- the guide rod 30 is drilled so as to be hollow, in such a way that the result is a pressure chamber 33 lying opposite the throttling head 29 , with the consequence of pressure equalization, so that the throttling member 27 can be displaced in the opening direction in the case of relatively small adjusting forces to be applied via the actuator 10 , the throttling head 29 entering the opening cross section 28 which widens in the opening direction.
- 34 denotes the relatively weak spring which loads the throttle member 27 in the closing direction.
- the opening cross section 28 is opened by appropriate current being supplied to the actuator 10 in a manner controlled by the control unit 20 , to such an extent as is expedient with regard to the booster action desired for driving reasons and under comfort aspects and with regard to the volumetric flow required for this purpose.
- the flow valve 9 which is configured as a throttling valve is activated under cold start conditions in such a way that the opening cross section 28 , as shown in the drawing, is at least substantially closed above the throttling head 29 , with the result that, without any or any substantial volumetric flow to the consumer, the steering valve 4 in this case, a pressure is initially built up with respect to the vane cell pump 2 , which pressure presses the vanes of the vane cell pump 2 into their radially outer position on the cam ring. As a result, short circuit connections between the individual working chambers of the vane cell pump are quickly interrupted.
- a method of operation of this type which serves substantially solely to build up pressure is required only for a very short time and therefore does not impair the power steering system with regard to immediate activation when starting the vehicle, and is achieved without extra expenditure on the construction via appropriate activation of the control valve 9 which, given appropriate activation by the control unit 20 , additionally ensures that the vane cell pump 2 which operates as a fixed displacement pump conveys only that proportion of the delivery volume to the steering valve 4 or possibly a booster actuating unit which is required for driving and/or comfort reasons.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Power Steering Mechanism (AREA)
- Rotary Pumps (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
Abstract
A vane cell pump is provided for a hydraulic steering system for motor vehicles for pressure supply, a flow valve whose opening cross section is at least substantially closed during cold start operation being arranged downstream of said vane cell pump on the delivery side.
Description
- The invention relates to a hydraulic power steering system for motor vehicles according to the preamble of claim 1.
- Power steering systems of the abovementioned type are known from DE 42 20 624 A1 and are provided, in the junction from the high pressure pump to the steering valve, with a flow valve whose opening cross section, in order to change the booster effect across the vehicle speed, can be varied via an appropriately activated, electromagnetic actuator.
- Furthermore, DE 195 29 807 A1 has disclosed a vane cell pump, downstream of which on the delivery side there is arranged a 3-way flow regulating valve which opens the delivery to the consumer only when a certain minimum pressure is present. This is intended to improve the cold start behavior of the vane cell pump. It is assumed here that sufficient delimitation of the working spaces with respect to one another is not achieved and therefore short circuit effects occur under cold start conditions as a result of insufficient radial pressure loading. The delivery capacity is reduced as a result and the disadvantage of the reduced delivery capacity and of the slower build-up of pressure as a result are to be compensated for by the outflow path on the delivery side being closed by the flow regulating valve. The flow regulating valve configured with regard to this is complicated in construction terms.
- The invention is based on the object of configuring a hydraulic steering system of the type mentioned in the introduction in such a way that said hydraulic steering system satisfies the increased comfort requirements, to be precise with low energy input and without increased structural complexity.
- This is achieved according to the invention by the features of claim 1, a vane cell pump which is distinguished by low pulsation and favorable noise behavior being used as fixed displacement high pressure pump. A flow valve which can be acted on by an electromagnetic actuator is provided connected downstream of the vane cell pump, which flow valve, in conjunction with a pressure relief valve connected in between, easily makes it possible to adapt the delivery amount to the requirement needed for power assistance as a function of driving conditions and driving behavior, it being additionally possible, according to the invention, for the flow valve to be activated via the electromagnetic actuator during cold start operation in such a way that the pressure in the vane cell pump builds up as quickly as possible. The invention therefore advantageously combines the utilization of the flow valve to minimize the energy consumption and for improved cold start operation with a corresponding reduction in wear, this combination not requiring any structural outlay and substantially being based on the utilization of data recorded anyway for vehicle operation, with an appropriate software link.
- In a particularly simple way, the flow valve in the solution according to the invention can be configured as a throttling valve, the closing direction of the throttling valve preferably corresponding to the direction of throughflow. Given appropriate spring loading in the closing direction it is accordingly possible to use weak springs, and the actuating forces which are to be produced electromagnetically are to be kept small irrespectively of this if the throttling valve is configured to be relieved of pressure in a further refinement according to the invention.
- In a manner according to the invention, the electromagnetic actuator is activated under parameters defining cold start conditions in order to take cold start operation into consideration, said parameters usually being recorded during vehicle operation including internal combustion engine operation and it being possible to call them up both individually and linked to one another, it being possible to record as cold start parameters, in particular, the engine temperature, the outside temperature, the rotational speed of the engine, the standstill time of the engine and also further parameters, however.
- Further details and features of the invention emerge from the claims and, furthermore, the invention will be explained in the following text using an exemplary embodiment:
-
FIG. 1 showing a diagrammatic representation of a hydraulic power steering system according to the invention, and -
FIG. 2 showing a section through a flow valve configured as a throttling valve, as is to be used advantageously within the scope of the invention. - In the diagrammatic representation according to
FIG. 1 of the hydraulic power steering system 1 according to the invention, 2 denotes the vane cell pump which is configured as a fixed displacement pump, is fed from a storage vessel 3 and delivers to a steering valve 4, downstream of which there is arranged an actuating device for the steering mechanism 5 unless it is integrated into the steering valve 4. The connections which lead from the steering mechanism 5 to the wheels are indicated at 6. Furthermore, the connection of the steering valve 4 to the steering wheel (not shown) is indicated by a steering shaft 7 (shown diagrammatically). - An expanding tube 8 lies in the connection of the vane cell pump 2 to the steering valve 4 as a pressure store and/or an element which damps pulses, and, furthermore, a flow valve 9 is arranged adjacent to the vane cell pump 2, said flow valve 9 being assigned an electromagnetic actuator 10, as shown in greater detail in
FIG. 2 . - In the junction between the vane cell pump 2 and flow valve 9, there is a branch 11 to a pressure relief valve 12 which is connected to the suction line 13 of the pump 2 via a line section 14. The pressure relief valve 12 is pressure controlled, to be precise as a function of the pressure prevailing in the line connection 15 between the flow valve 9 and steering valve 4, as indicated by the dash-dotted line 16. The return from the steering valve 4 to the storage vessel 3 takes place via a line 17 in which a cooler 18 is arranged.
- Furthermore, a steering speed sensor 38 is indicated diagrammatically, by which the rotary speed of the steering shaft 7 is tapped off, and a speed sensor 19 is indicated diagrammatically, by which the driving speed of the vehicle is recorded and which may be formed, for example, by the speedometer of the vehicle. The respectively recorded signals are processed in a control unit 20, the connection being produced via what is referred to as a CAN bus 21, as indicated diagrammatically. Further control parameters which identify cold start operation of the vane cell pump and which are usually recorded anyway in conjunction with other vehicle functions are preferably processed by the control unit 20.
- The supply of current to the actuator 10 is controlled by the control unit 20, the battery or some other current connection in the vehicle being provided, for example, as current source 22 and the line connections 23 leading from the control unit 20 to the actuator.
- In the representation according to
FIG. 2 , a valve housing 24 is provided in which the inlet connection on the pump side is denoted by 25 and the connection which leads to the steering valve 4 is denoted by 26. - In the junction region between these connections 25 and 26, there lies the opening cross section 28 which is controlled via the throttling member 27 of the flow valve 9 configured as a throttling valve and into which the widened throttling head 29 of the throttling member 27 engages, the guide rod 30 being attached to said throttling head 29. The guide rod 30 extends as far as the region of the winding 31 of the electromagnetic actuator 10 and has an armature 32 in this end region. The guide rod 30 is drilled so as to be hollow, in such a way that the result is a pressure chamber 33 lying opposite the throttling head 29, with the consequence of pressure equalization, so that the throttling member 27 can be displaced in the opening direction in the case of relatively small adjusting forces to be applied via the actuator 10, the throttling head 29 entering the opening cross section 28 which widens in the opening direction. 34 denotes the relatively weak spring which loads the throttle member 27 in the closing direction.
- During operation of the power steering system 1, the opening cross section 28 is opened by appropriate current being supplied to the actuator 10 in a manner controlled by the control unit 20, to such an extent as is expedient with regard to the booster action desired for driving reasons and under comfort aspects and with regard to the volumetric flow required for this purpose.
- With regard to the reduced delivery capacity of the vane cell pump 2 under cold start conditions, the flow valve 9 which is configured as a throttling valve is activated under cold start conditions in such a way that the opening cross section 28, as shown in the drawing, is at least substantially closed above the throttling head 29, with the result that, without any or any substantial volumetric flow to the consumer, the steering valve 4 in this case, a pressure is initially built up with respect to the vane cell pump 2, which pressure presses the vanes of the vane cell pump 2 into their radially outer position on the cam ring. As a result, short circuit connections between the individual working chambers of the vane cell pump are quickly interrupted.
- A method of operation of this type which serves substantially solely to build up pressure is required only for a very short time and therefore does not impair the power steering system with regard to immediate activation when starting the vehicle, and is achieved without extra expenditure on the construction via appropriate activation of the control valve 9 which, given appropriate activation by the control unit 20, additionally ensures that the vane cell pump 2 which operates as a fixed displacement pump conveys only that proportion of the delivery volume to the steering valve 4 or possibly a booster actuating unit which is required for driving and/or comfort reasons.
Claims (7)
1. A hydraulic power steering system for motor vehicles having a steering mechanism, a steering valve and a fixed displacement high pressure pump which has a connection to the steering valve in which a flow valve is situated whose opening cross section can be adjusted via an electromagnetic actuator with parameters which influence the steering behavior being taken into consideration, the high pressure pump being configured as a vane cell pump followed on the delivery side by the flow valve with a pressure relief valve connected in between, and the opening cross section of the flow valve is at least substantially closed during cold start opening of the vane cell pump.
2. The hydraulic power steering system as claimed in claim 1 , wherein the flow valve is configured as a throttling valve.
3. The hydraulic power steering system as claimed in claim 2 , wherein the closing direction of the throttling valve corresponds to the direction of throughflow.
4. The hydraulic power steering system as claimed in claim 2 , wherein the throttling valve is spring-loaded in the closing direction.
5. The hydraulic power steering system as claimed in claim 2 , wherein the throttling valve is configured to be relieved of pressure.
6. The hydraulic power steering system as claimed in claim 1 , wherein it is possible to actuate the electromagnetic actuator with parameters which limit cold start conditions of the vane cell pump being taken into consideration.
7. The hydraulic power steering system as claimed in claim 6 , wherein the engine temperature of the vehicle engine, the outside temperature, the rotational speed of the vehicle engine, the standstill time of the vehicle engine starting are provided as cold start parameters.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/064,387 US20050196308A1 (en) | 2002-08-23 | 2005-02-22 | Hydraulic power steering system for motor vehicles |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10238821.0 | 2002-08-23 | ||
DE10238821A DE10238821A1 (en) | 2002-08-23 | 2002-08-23 | Hydraulic power steering for motor vehicle has throttle valve to close pressure side of pump on start up |
PCT/EP2003/008755 WO2004027216A1 (en) | 2002-08-23 | 2003-08-07 | Hydraulic power-assisted steering system for motor vehicles |
US11/064,387 US20050196308A1 (en) | 2002-08-23 | 2005-02-22 | Hydraulic power steering system for motor vehicles |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2003/008755 Continuation WO2004027216A1 (en) | 2002-08-23 | 2003-08-07 | Hydraulic power-assisted steering system for motor vehicles |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050196308A1 true US20050196308A1 (en) | 2005-09-08 |
Family
ID=31197312
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/064,387 Abandoned US20050196308A1 (en) | 2002-08-23 | 2005-02-22 | Hydraulic power steering system for motor vehicles |
Country Status (5)
Country | Link |
---|---|
US (1) | US20050196308A1 (en) |
EP (1) | EP1537295B1 (en) |
JP (1) | JP2005536401A (en) |
DE (2) | DE10238821A1 (en) |
WO (1) | WO2004027216A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100148103A1 (en) * | 2008-12-15 | 2010-06-17 | Continental Automotive Systems Us, Inc. | Automobile high pressure pump solenoid valve |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202005013303U1 (en) * | 2005-08-23 | 2005-11-24 | Trw Automotive Gmbh | Pump, especially motor and pump unit for motor vehicle's servo steering system, has fluid outlet of pressure limiting valve connected to suction connection of pump |
DE102006051608B4 (en) * | 2006-11-02 | 2017-07-13 | Volkswagen Ag | Hydraulic steering |
DE102010015293A1 (en) | 2010-04-17 | 2011-10-20 | Gm Global Technology Operations Llc (N.D.Ges.D. Staates Delaware) | Hydraulic servo steering system for motor vehicle, has pumping unit for generating volume flow- and pressure pulsation, where pumping unit is connected with hydraulic medium container through input line |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3367354A (en) * | 1964-11-09 | 1968-02-06 | Gen Motors Corp | Valve |
US4293051A (en) * | 1977-10-17 | 1981-10-06 | Honda Giken Kogyo Kabushiki Kaisha | Power steering device for vehicles |
US4629025A (en) * | 1985-01-22 | 1986-12-16 | General Motors Corporation | Flow regulated power assist steering system with evasive maneuver capability |
US4877099A (en) * | 1986-09-02 | 1989-10-31 | Ford Motor Company | Electronically controlled variable assist power steering system |
US4955446A (en) * | 1988-01-26 | 1990-09-11 | Koyo Seiko Co., Ltd. | Hydraulic power steering apparatus |
US5058626A (en) * | 1988-09-14 | 1991-10-22 | Honda Giken Kogyo Kabushiki Kaisha | Hydraulic pressure control valve |
US5769121A (en) * | 1994-09-21 | 1998-06-23 | Zf Friedrichshafen Ag. | Rotary slide valve for power-assisted steering in motor vehicles |
US6082242A (en) * | 1997-10-16 | 2000-07-04 | Kayaba Industry Co., Ltd. | Power steering system |
US6216806B1 (en) * | 1999-07-07 | 2001-04-17 | Caterpillar Inc. | Supplement steering system |
US6390228B2 (en) * | 2000-04-25 | 2002-05-21 | Showa Corporation | Hydraulic power steering apparatus for vehicle |
US6520278B2 (en) * | 1998-07-10 | 2003-02-18 | Showa Corporation | Hydraulic power steering device |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2512433C2 (en) * | 1975-03-21 | 1982-03-04 | Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen | Double-stroke rotary lobe pump, especially for power steering |
US5445239A (en) * | 1994-08-01 | 1995-08-29 | General Motors Corporation | Motor vehicle power steering system |
DE19529807A1 (en) * | 1995-08-14 | 1997-02-20 | Luk Fahrzeug Hydraulik | Double hub flywheel pump |
DE19735757A1 (en) * | 1997-08-18 | 1999-02-25 | Audi Ag | Hydraulic servo assisted steering |
-
2002
- 2002-08-23 DE DE10238821A patent/DE10238821A1/en not_active Withdrawn
-
2003
- 2003-08-07 DE DE50303234T patent/DE50303234D1/en not_active Expired - Lifetime
- 2003-08-07 JP JP2004536930A patent/JP2005536401A/en not_active Withdrawn
- 2003-08-07 WO PCT/EP2003/008755 patent/WO2004027216A1/en active IP Right Grant
- 2003-08-07 EP EP03797229A patent/EP1537295B1/en not_active Expired - Lifetime
-
2005
- 2005-02-22 US US11/064,387 patent/US20050196308A1/en not_active Abandoned
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3367354A (en) * | 1964-11-09 | 1968-02-06 | Gen Motors Corp | Valve |
US4293051A (en) * | 1977-10-17 | 1981-10-06 | Honda Giken Kogyo Kabushiki Kaisha | Power steering device for vehicles |
US4629025A (en) * | 1985-01-22 | 1986-12-16 | General Motors Corporation | Flow regulated power assist steering system with evasive maneuver capability |
US4877099A (en) * | 1986-09-02 | 1989-10-31 | Ford Motor Company | Electronically controlled variable assist power steering system |
US4955446A (en) * | 1988-01-26 | 1990-09-11 | Koyo Seiko Co., Ltd. | Hydraulic power steering apparatus |
US5058626A (en) * | 1988-09-14 | 1991-10-22 | Honda Giken Kogyo Kabushiki Kaisha | Hydraulic pressure control valve |
US5769121A (en) * | 1994-09-21 | 1998-06-23 | Zf Friedrichshafen Ag. | Rotary slide valve for power-assisted steering in motor vehicles |
US6082242A (en) * | 1997-10-16 | 2000-07-04 | Kayaba Industry Co., Ltd. | Power steering system |
US6520278B2 (en) * | 1998-07-10 | 2003-02-18 | Showa Corporation | Hydraulic power steering device |
US6216806B1 (en) * | 1999-07-07 | 2001-04-17 | Caterpillar Inc. | Supplement steering system |
US6390228B2 (en) * | 2000-04-25 | 2002-05-21 | Showa Corporation | Hydraulic power steering apparatus for vehicle |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100148103A1 (en) * | 2008-12-15 | 2010-06-17 | Continental Automotive Systems Us, Inc. | Automobile high pressure pump solenoid valve |
US8317157B2 (en) * | 2008-12-15 | 2012-11-27 | Continental Automotive Systems Us, Inc. | Automobile high pressure pump solenoid valve |
Also Published As
Publication number | Publication date |
---|---|
EP1537295B1 (en) | 2006-05-03 |
DE10238821A1 (en) | 2004-03-04 |
JP2005536401A (en) | 2005-12-02 |
EP1537295A1 (en) | 2005-06-08 |
DE50303234D1 (en) | 2006-06-08 |
WO2004027216A1 (en) | 2004-04-01 |
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Date | Code | Title | Description |
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AS | Assignment |
Owner name: ZF LENKSYSTEME GMBH, GERMANY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SCHMID, JOHANNES;REEL/FRAME:016591/0264 Effective date: 20050309 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |