Patent ID: 8033618
Filing Date: 2011-10-11
Classification: B60T

Abstract:
1. A brake system for a vehicle comprising: a booster; a pressure sensor for sensing a pressure in the booster; a brake pedal for receiving brake input from an operator of the vehicle; a brake pedal travel detector for detecting an amount of travel of the brake pedal; a pump for providing hydraulic pressure to one or more wheels of the vehicle in response to the amount of travel of the brake pedal; and a controller for controlling the amount of pressure provided to one or more wheels, wherein the controller provides more pressure to the one or more wheels when the pressure sensor detects a low booster pressure and the brake pedal travel detector detects a movement of the brake pedal, wherein the pressure sensor is a vacuum transducer and when a very low booster vacuum level is detected with the vacuum transducer, the brake pedal travel sensor is used to calculate a virtual pressure, and wherein the virtual pressure represents an actual pressure that could be achieved, when the booster has normal vacuum present and the virtual pressure is used as an input to the controller.