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Detection and identification of pressure-sensor faults in electro-hydraulic (EHB) braking systems

  • US 6,634,221 B2
  • Filed: 03/26/2002
  • Issued: 10/21/2003
  • Est. Priority Date: 11/27/1998
  • Status: Expired due to Fees
First Claim
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1. A method of detection and identification of pressure sensor faults in a braking system of the type comprising a brake pedal, respective braking devices connected to the vehicle wheels and which communicate with electronically controlled 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 said pump for the provision of hydraulic fluid under pressure which can be passed to the braking devices via the electronically controlled valves in order to apply hydraulic fluid under pressure to the braking devices as a function of 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 which method at least three of said pressure sensors are subjected to the same pressure and their readings are measured and compared to identify a sensor whose reading does not correspond to that of the others.

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