| CPC B60T 13/686 (2013.01) [B60T 8/1761 (2013.01); B60T 8/4081 (2013.01); B60T 11/228 (2013.01); B60T 13/745 (2013.01); B60T 17/221 (2013.01)] | 18 Claims |
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1. An electric brake system comprising:
a reservoir in which a pressurizing medium is stored;
a master cylinder configured to pressurize and discharge the pressurizing medium stored in the reservoir;
a hydraulic pressure supply device configured to operate a hydraulic piston according to an electrical signal output in response to a displacement of a brake pedal and generate a hydraulic pressure;
a hydraulic pressure control unit configured to control the hydraulic pressure transmitted to a wheel cylinder from the hydraulic pressure supply device;
a hydraulic pressure auxiliary device configured to operate when the hydraulic pressure supply device is inoperable and provide the hydraulic pressure to two wheel cylinders, and including a pair of pumps configured to pressurize the pressurizing medium, a motor configured to drive the pair of pumps, a first support valve provided on a first auxiliary hydraulic pressure flow path for transmitting the pressurizing medium pressurized by any one of the pair of pumps to a first wheel cylinder to control a flow of the pressurizing medium, a first discharge valve to control a discharge of the pressurizing medium of the first wheel cylinder to the reservoir, a second support valve provided on a second auxiliary hydraulic pressure flow path for transmitting the pressurizing medium pressurized by the other of the pair of pumps to a second wheel cylinder to control the flow of the pressurizing medium and a second discharge valve to control a discharge of the pressurizing medium of the second wheel cylinder to the reservoir;
a pressure sensor configured to detect pressures of the pressurizing media transmitted to the first support valve and the second support valve from the pair of pumps; and
a controller configured to control the hydraulic pressure supply device, the hydraulic pressure control unit, and the hydraulic pressure auxiliary device,
wherein the controller is configured to estimate a wheel pressure of at least one control target wheel cylinder of the first wheel cylinder and the second wheel cylinder during anti-lock braking system (ABS) control in a first fallback mode performed by the hydraulic pressure auxiliary device, synchronize an upstream pressure and a downstream pressure of at least one control target support valve of the first support valve and the second support valve, and compensate the estimated wheel pressure of the control target wheel cylinder to be the pressure detected by the pressure sensor during the synchronization.
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