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Driver warning of braking malfunction in electro-hydraulic (EHB) braking systems

  • US 6,398,319 B1
  • Filed: 12/29/1999
  • Issued: 06/04/2002
  • Est. Priority Date: 12/31/1998
  • Status: Expired due to Fees
First Claim
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1. An electro-hydraulic braking system of the type capable of operation in a brake-by-wire mode wherein hydraulic pressure is applied to braking devices at the vehicle wheels in proportion to the driver'"'"'s braking demand as sensed electronically at a brake pedal, and in a push-through mode wherein hydraulic pressure is applied to the braking devices at the vehicle wheels by way of a master cylinder coupled mechanically to the brake pedal, and which includes a hydraulic travel simulator which is connected hydraulically to said master cylinder for providing improved feel for the driver through the brake pedal in the brake-by-wire operation mode, wherein when it is detected that there exists within the system a prescribed category of non safety-critical fault, it is arranged that the driver is caused to experience a modified, different to usual, travel/force behavior characteristic through the braking pedal when braking, and wherein the modified travel/force behavior characteristic is achieved by deliberately inducing oscillations in the brake pressure so as to create at least one of audible noise and vibrations in the vehicle chassis.

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