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
  • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
  • B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
  • B62D5/0481—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures
  • B62D5/0493—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures detecting processor errors, e.g. plausibility of steering direction
• • 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
  • B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
  • B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
  • B62D5/0481—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures
  • B62D5/0484—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures for reaction to failures, e.g. limp home
• • 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
  • B62D6/008—Control of feed-back to the steering input member, e.g. simulating road feel in steer-by-wire applications

Definitions

• the invention relates to a method for operating a power-assisted power steering system, to such an auxiliary power steering, and to a computer program and a computer program product for carrying out the method.
• EPS Electric Power Steering
• a setpoint engine torque for the EPS motor is functionally calculated by various components and adjusted by a motor current control.
• the essential steering functions are calculated temporally and functionally dv ⁇ rsitar and the results compared. In this case, it should be ensured that any errors that are present do not lead to safety-critical driving situations.
• the presented method is used to operate a power steering system, with an electronic computing unit calculating an engine torque and admitting it by means of a suitable engine control.
• an electronic computing unit calculating an engine torque and admitting it by means of a suitable engine control.
• the calculated engine torque in the context of a 3-level concept.
• an intrinsically safe motor torque limit curve is used as a function of an actual torque, for example an actual hand torque or a driver torque.
• An integration of a component above the motor torque limit curve and a de-integration of an integrator with Ante! performed below the engine torque limit curve.
• the SoII engine torque is limited in level 1 on a first irrigation swing, and in level 2, the limit is monitored.
• the HHfskraftlenkung be transferred to a safe state. This may mean that the system is shut down.
• a widening of the upper and lower limits takes place only in accordance with the correct direction of rotation.
• a widening of the upper and lower limits can only take place from certain engine torques.
• the application should be determined by vehicle search.
• the aim is that all operating conditions within the engine torque limit curve are intrinsically safe, i. remain manageable for the normal driver.
• the proposed power steering system of a motor vehicle is used in particular for carrying out a method as described above and comprises: an electric motor for initiating a predetermined additional torque to achieve a free l-entanorne ⁇ tbeein kgung,
• an electronic control unit for controlling the motor which is adapted to calculate a target engine torque, so that a desired Beurti- mung torque on the steering handle adjusts a control deviation between the target and Istbetuschistsmmoment by calculating a target engine torque can be minimized by a suitable motor control.
• a suitable motor control for example, by a current control, can beLeehe.
• the power steering system may further include a microprocessor communicating with a security computer
• safety-critical faulty control mechanisms which are caused, for example, by computer errors of the microprocessor, can be detected sufficiently quickly so that the steering system assumes the safe state It is important to know before safety-critical effects on the vehicle and occupants arise.
• the presented function can be embedded in the security concept of existing EPS systems with a computing unit.
• the monitoring is done primarily by observing the combination of manual and engine torque.
• the driver's torque i. the moment that the driver feels on the steering wheel can be used, which is calculated from the manual torque (torsion bar torque) by compensating for the moment inertia influences of the steering wheel.
• torque bar torque the manual torque
• the whole system behavior of the power steering system is monitored by this concept, so that a monitoring of the individual functionalities hinfallg. This also simplifies the proof of safety.
• the Ebi computer program includes program code means for performing all the steps of a method as described above when the computer program is executed on a computer or a corresponding computing unit.
• a tampere program product includes these program code means stored on a computer-readable medium.
• This computer program may be stored on a computer-readable medium such as a floppy disk, CD, DVD, hard disk, USB memory stick or the like, or an internet server as a computer program product. From there, the computer program can be transferred to a memory element of the control unit.
• FIG. 1 shows an embodiment of the invention.
• FIG. 2 shows in a graph the curve of the motor-mode limit curve for clarifying the method according to the invention.
• FIG. 1 an embodiment of the power steering system, generally designated by the reference numeral 10, shown.
• the illustration shows a steering handle 12, a front axle 14 with two hinged R ⁇ dem 16, an electric motor 18 and a controller 20th
• FIG. 2 a graph 30 of the engine torque limit curve is shown in a graph. The actual hand moment is plotted on an abscissa 32 and the engine torque is plotted on an ordinate 34.
• the level 2 diveraitare algorithm recognizes this at a threshold B and can shade the system. It's good

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)
• Power Steering Mechanism (AREA)
• Control Of Electric Motors In General (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=42094154

Family Applications (1)

Country Status (6)

Families Citing this family (11)

Family Cites Families (40)

• 2009
  • 2009-01-13 DE DE102009000165A patent/DE102009000165A1/de not_active Ceased
  • 2009-12-03 WO PCT/EP2009/066299 patent/WO2010081592A2/de active Application Filing
  • 2009-12-03 EP EP09796341A patent/EP2376323A2/de not_active Withdrawn
  • 2009-12-03 CN CN200980152558.9A patent/CN102264592B/zh active Active
  • 2009-12-03 JP JP2011545651A patent/JP5657568B2/ja active Active
• 2011
  • 2011-06-08 US US13/134,469 patent/US20110276230A1/en not_active Abandoned

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events