WO2002000487A1 - Dispositif de servo-direction de vehicule automobile - Google Patents
Dispositif de servo-direction de vehicule automobile Download PDFInfo
- Publication number
- WO2002000487A1 WO2002000487A1 PCT/FR2001/001869 FR0101869W WO0200487A1 WO 2002000487 A1 WO2002000487 A1 WO 2002000487A1 FR 0101869 W FR0101869 W FR 0101869W WO 0200487 A1 WO0200487 A1 WO 0200487A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steering
- actuators
- wheels
- control
- wheel
- Prior art date
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
- B62D5/001—Mechanical components or aspects of steer-by-wire systems, not otherwise provided for in this maingroup
- B62D5/003—Backup systems, e.g. for manual steering
-
- 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
- B62D5/10—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 type of power unit
- B62D5/12—Piston and cylinder
Definitions
- the present invention relates to a motor vehicle servo-steering device for controlling the steering angle of the left and right wheels of at least one steering axle of said vehicle and, more particularly, such a device comprising a) a manual control member of a setpoint generator for said turning angles, b) first and second turning actuators of said left and right wheels, and c) regulation means sensitive to said setpoint value for r order - - e's ⁇ ts "actuators according to two separate control chains.
- a device of this type is known from French patent application No. 00 01417 filed on February 4, 2000 by the applicant.
- this device comprises- a flywheel 1 constituting a manual control member of a generator 2 of a set value for the steering angle of the left and right wheels 5 and 5 'respectively , of a steering axle of the vehicle.
- This value is determined by the driver of the vehicle, who turns the steering wheel 1.
- the generator 2 can be constituted by a position sensor, of any known type, suitable for forming a representative signal the angular position of the steering wheel. This signal is supplied to a regulator 3 which draws from it a set value of the steering angle requested by the driver.
- the regulator 3 also controls a force variator 12 acting on the shaft of the steering wheel 1 so that the driver finds, on this steering wheel, the friction and restoring forces which he experiences when he operates the steering wheel of a device conventional steering, these forces no longer "rising" on the steering wheel of the device of Figure 1, mechanically decoupled from the wheels 5, 5 'and the means used to maneuver them.
- the latter are constituted by first and second actuators 9,9 'acting, in the device for the aforementioned patent application, on the turning angle of the wheels 5, 5 'respectively. As also appears in FIG.
- each of the actuators 9, 9 ′ takes the form of a jack mounted on the wheel axle itself, between a fixed point of articulation 7, 7 ′ on this axle, respectively and an arm 8, 8 ′ for operating a rocket, articulated in 6, 6 ′ respectively, on which the wheel 5, 5 ′ is mounted respectively.
- the arms 8, 8 ′ are connected to the rods 9 lf 9 ′ of the jacks 9, 9 ′ respectively, by, 0- -rigi-des-8r -8 -8-' ⁇ links, respectively.
- Position sensors 10, 10 ′ sensitive to the elongation of the rods of the cylinders 9, 9 ′ respectively, supply signals to the regulator 3, the representative of these elongations.
- the regulator 3 enslaves these elongations to set values l c , l ' c corresponding to the turning angles 0 sought for the wheels 5, 5'.
- the control is ensured by an appropriate control of the energy E, E 'delivered to the cylinders 9, 9' to operate the rods 9 ⁇ , 9' ⁇ respectively, this energy being taken from an energy source 11 5 on board the vehicle.
- the regulator is duly programmed to carry out the calculations necessary for the evaluation of these amounts of energy E, E ′ as well as for the formation of the control signal of the force variator 12 acting on the shaft of the flywheel 1, as we saw above. To do this, it can use various parameters representative of the state of the vehicle or of its environment, such as the speed of the vehicle, the load of this vehicle, the torque exerted by the driver on the steering wheel, the force of the side wind, 5 etc., these parameters being known to regulator 3 thanks to appropriate sensors, globally symbolized by input 4 in FIG. 1.
- the power source 11 used to power the actuators is an electrical power source such as an alternator driven by the engine of the vehicle, assisted by a battery in the event of the engine stopping or the alternator failing. .
- the elongation of the rods of the jacks is therefore controlled using energy drawn from this source.
- the cylinders can be
- the power steering device described in the aforementioned patent application comprises two chains of
- the present invention specifically aims to achieve a serv ⁇ -direction device of the type described above, with improved operational safety.
- the two wheels of the axle can be steered by only one of the actuators, in the event of failure of the other, which improves the operational safety of the vehicle's power steering.
- these diagnostic means 3 ′ are incorporated into the regulator 3, conventionally constituted by a
- 35 3 'diagnostics continuously analyze the performance of the power steering device so as to deduce therefrom the operating state of the various elements of the two control chains.
- the diagnostic means 3' emit a signal d lf d 2 respectively for controlling a deactivation means 14, 14 'of this actuator 9, 9', respectively.
- the actuator 9 shown is of the electro-hydraulic type, consisting of a jack with two chambers 15, 16 and a pump P driven by an electric motor M for passing a hydraulic liquid from one chamber to the other and thus moving, in one direction or the other, the rod 9 ⁇ of the jack controlling the turning of the wheel 5.
- the motor 18 is obviously controlled by the regulator 3.
- the deactivation means is constituted by a two-way and two-position solenoid valve 14, mounted in a fluid conduit 22 connecting the two chambers 15, 16.
- the solenoid valve 14 passes from a position where it cuts the conduit 22 to a position where it puts the two chambers in fluid communication, via this conduit 22.'
- An operation of the pump P optionally erratic due to the detected failure of the steering control chain wheel 5, is' then no influence on the position of the rod 9 lf displaced liquid circulating in loop in the cylinder, thanks to the conduit 22.
- the activation of the solenoid valve 14 therefore completely deactivates the chain for controlling the turning of the wheel 5.
- the steering control of this wheel remains however ensured by means of a coupling mechanism of the steering of the two wheels, making it possible to transmit to the wheel 5 a steering force developed in the control chain of the wheel 5 ', by the actuator 9 'forming part of this chain.
- this coupling mechanism consists of a rigid bar 23 coupling the displacements of the rods 9%, 9 ' x of the jacks 9, 9', the ends of this bar being articulated on these rods at the rigid connections 8 ⁇ , 8',, for example.
- one of the jacks 9, 9 ′ can control both the turning of the two wheels, in the event of a failure of one of the control chains, after deactivation of the faulty control chain as described below. above.
- the failure rate of the solenoid valve 14 and of the computer constituting the regulator 3 and the diagnostic means 3 ' can be determined by tests carried out periodically. It is therefore possible to compare safety of operation of the device according to the invention, to that of the power steering devices of the prior art, with direction decoupled from the steering wheel and comprising one or two actuators.
- the probability of a loss of control of the vehicle equipped with the device according to the invention is linked to that of a simultaneous failure of the two actuators, or of an actuator and its deactivation solenoid valve, or of an actuator and of the diagnostic means of faulty operation (failure). The probability of losing control of a vehicle with a single actuator power steering device is much greater.
- the probability of vehicle unavailability due to a failure of the power steering device according to the invention is much lower than in the case of a device with a single actuator.
- the probability of such unavailability for a device with two actuators, not coupled by a connecting rod, is much higher than in the case of the present invention, where this unavailability can only result from the simultaneous failure of the two chains of ordered.
- the invention is not limited to the embodiment shown, which has been given only by way of example.
- the device according to the invention could be equipped with actuators constituted by electromechanical cylinders with ball screws, in place of electro-hydraulic cylinders such as that shown diagrammatically in FIG. 2.
- the actuator deactivation solenoid valve can be replaced by a controlled clutch, interposed between the electric motor driving the actuator and the screw / rod of the latter.
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)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU67669/01A AU6766901A (en) | 2000-06-27 | 2001-06-15 | Motor vehicle power steering device |
EP01945449A EP1294604A1 (fr) | 2000-06-27 | 2001-06-15 | Dispositif de servo-direction de vehicule automobile |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR00/08252 | 2000-06-27 | ||
FR0008252A FR2810615B1 (fr) | 2000-06-27 | 2000-06-27 | Dispositif de servo-direction de vehicule automobile |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002000487A1 true WO2002000487A1 (fr) | 2002-01-03 |
Family
ID=8851750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2001/001869 WO2002000487A1 (fr) | 2000-06-27 | 2001-06-15 | Dispositif de servo-direction de vehicule automobile |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1294604A1 (fr) |
AU (1) | AU6766901A (fr) |
FR (1) | FR2810615B1 (fr) |
WO (1) | WO2002000487A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2850939B1 (fr) * | 2003-02-11 | 2005-03-11 | Renault Vehicules Ind | Procede de commande de la direction d'un vehicule automobile |
FR2850937B1 (fr) * | 2003-02-11 | 2006-02-03 | Renault Vehicules Ind | Procede de commande de la direction d'un vehicule automobile |
JP6586181B2 (ja) * | 2018-02-20 | 2019-10-02 | 本田技研工業株式会社 | 車両用操向システム |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0983926A2 (fr) * | 1998-09-02 | 2000-03-08 | DaimlerChrysler AG | Système de direction pour automobiles non guidées |
-
2000
- 2000-06-27 FR FR0008252A patent/FR2810615B1/fr not_active Expired - Fee Related
-
2001
- 2001-06-15 WO PCT/FR2001/001869 patent/WO2002000487A1/fr not_active Application Discontinuation
- 2001-06-15 EP EP01945449A patent/EP1294604A1/fr not_active Withdrawn
- 2001-06-15 AU AU67669/01A patent/AU6766901A/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0983926A2 (fr) * | 1998-09-02 | 2000-03-08 | DaimlerChrysler AG | Système de direction pour automobiles non guidées |
Also Published As
Publication number | Publication date |
---|---|
EP1294604A1 (fr) | 2003-03-26 |
AU6766901A (en) | 2002-01-08 |
FR2810615A1 (fr) | 2001-12-28 |
FR2810615B1 (fr) | 2002-10-11 |
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