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A method of detection and identification of pressure sensor faults in an electro-hydraulic braking system of the type comprising a brake pedal, respective braking devices connected to the vehicle wheels and which communicate with electronically controlled proportional control valves in order to appl

A method of detection and identification of pressure sensor faults in an electro-hydraulic braking system of the type comprising a brake pedal, respective braking devices connected to the vehicle wheels and which communicate with electronically controlled proportional control valves in order to apply hydraulic fluid under pressure to the braking devices, respective pressure sensors for measuring the hydraulic pressures at the individual braking devices, a hydraulic pump driven by an electric motor, a high pressure hydraulic pressure accumulator fed by the pump for the provision of hydraulic fluid under pressure which can be passed to the braking devices via the proportional control valves in order to apply hydraulic fluid under pressure to the braking devices in proportion to the driver's braking demand as sensed at the brake pedal, and a supply pressure sensor for monitoring the hydraulic pressure supplied to the electronically controlled proportional control valves. In accordance with the method, three or more of the pressure sensors are arranged to be subjected to the same pressure and their readings measured and compared whereby to identify a sensor whose reading does not correspond to that of the others.

대표청구항 ▼

A method of detection and identification of pressure sensor faults in an electro-hydraulic braking system of the type comprising a brake pedal, respective braking devices connected to the vehicle wheels and which communicate with electronically controlled proportional control valves in order to appl

A method of detection and identification of pressure sensor faults in an electro-hydraulic braking system of the type comprising a brake pedal, respective braking devices connected to the vehicle wheels and which communicate with electronically controlled proportional control valves in order to apply hydraulic fluid under pressure to the braking devices, respective pressure sensors for measuring the hydraulic pressures at the individual braking devices, a hydraulic pump driven by an electric motor, a high pressure hydraulic pressure accumulator fed by the pump for the provision of hydraulic fluid under pressure which can be passed to the braking devices via the proportional control valves in order to apply hydraulic fluid under pressure to the braking devices in proportion to the driver's braking demand as sensed at the brake pedal, and a supply pressure sensor for monitoring the hydraulic pressure supplied to the electronically controlled proportional control valves. In accordance with the method, three or more of the pressure sensors are arranged to be subjected to the same pressure and their readings measured and compared whereby to identify a sensor whose reading does not correspond to that of the others. 0, Harris et al., 073/121 eway (3) intended to be associated with a rotating member (6); and a mechanical interface (5) associated with the said fixed raceway (2) by means of association means (7), this interface (5) being intended to be interposed between the fixed raceway (2) of the bearing (1) and the fixed structure, the said interface (5) comprising: first means (8) of fixing to the fixed structure; second means (9) of fixing a device (10) intended to apply a force to the rotating member (6); and at least one elastic deformation zone (29-33) able to be deformed under the action of forces exerted on the said assembly, at least one sensor (38) able to measure the said forces causing deformation of said elastic deformation zone (29-33); characterised in that the interface (5) comprises: four first projections (34-37) disposed substantially at 90° with respect to each other, defining between them three elastic deformation zones (29-31) on each of which at least one sensor (38) is disposed; and two second projections (43, 44) located between two adjacent first projections (37, 34), each second projection (43, 44) being provided with at least one sensor (38). 7. Assembly according to claim 1, characterised in that openings (48) are formed in the first (34-37) and/or second (43, 44) projections. 8. Assembly according to claim 1, characterised in that the first fixing means (8) also form means (7) of associating the interface (5) with the fixed raceway (2) of the bearing (1). 9. Assembly according to claim 8, characterised in that the fixed raceway (2) comprises a flange (18) comprising radial projections in which axial holes (22) are formed, disposed opposite those (28) of the first fixing means (8) so as to provide the fixing of the interface (5) by screwing onto the bearing (1). 10. Assembly according to claim 1, characterised in that the means (7) of associating the interface (5) on the bearing is provided on the fixed raceway (2), and the first (8) and second (9) fixing means are provided on the interface (5). 11. Assembly according to claim 10, characterised in that the fixed raceway (2) comprises a radial flange (18), axial holes (26) being formed opposite the said flange (18) and in the interface (5) so as to provide their association by screwing. 12. Assembly according to claim 1, characterised in that the elastic deformation zone or zones (29-33) are located in the vicinity of the first (8) and/or second (9) fixing means and/or in the vicinity of the association means (7). 13. Assembly according to claim 12, characterised in that the sensor or sensors (38) located in the vicinity of the first fixing means (8) and/or in the vicinity of the association means (7) are arranged so as to measure the forces applied to the first fixing means (8) and/or transmitted to the fixed raceway (2), and their respective moments, according to three orthogonal directions forming a trihedron together. 14. Assembly according to claim 12, characterised in that the sensor or sensors (38) located in the vicinity of the second fixing means (9) are arranged so as to measure the forces applied to the second fixing means (9), and their respective moments, in three orthogonal directions forming a trihedron together. 15. Assembly according to claim 1, characterised in that the sensors (38) are or comprise strain gauges based on piezoresistive elements. 16. Assembly according to claim 1, characterised in that the sensors (38) are or comprise acoustic surface wave sensors. 17. Assembly according to claim 1, characterised in that the sensors (38) are or comprise magnetic field sensors. 18. Assembly according to claim 1, characterised in that at least one sensor (38) is disposed on an intermediate part (42) fixed to an elastic deformation zone (29-33) by embedding, welding, gluing or the like. 19. Braking assembly comprising an assembly according to claim 1 and a brake calliper (15) associated with the mechanical interface (5) by means of the second fixing means (9)