Patent ID: 9511757
Filing Date: 2016-12-06
CPC Classification: B60T

Claim Text:
1. A method for determining a failure in at least one of a service brake or parking brake having an electromotive brake device and a hydraulic brake device, the method comprising: monitoring an electromotive characteristic of an electric brake motor of the electromotive brake device while at least one of the electromotive brake device and the hydraulic brake device generates a clamping force; and detecting an error in the hydraulic brake device if the electromotive characteristic or a variable correlating thereto is outside an admissible value range, wherein the admissible value range includes values between a minimum acceptable electromotive characteristic value and a maximum acceptable electromotive characteristic value; wherein the error is detected if any one of: (i) the electromotive characteristic is an advance speed of a brake piston, the admissible value range is above a threshold brake piston advance speed value, and the monitored electromotive characteristic or the variable correlating thereto is outside the admissible value range; (ii) the electromotive characteristic is a current characteristic curve, the admissible value range is below a threshold current characteristic curve value, and the monitored electromotive characteristic or the variable correlating thereto is outside the admissible value range; and (iii) the electromotive characteristic is a traveled distance of the brake piston, the admissible value range is above a threshold traveled brake piston distance value, and the monitored electromotive characteristic or the variable correlating thereto is outside the admissible value range; wherein one of: (i) the parking brake is automatically released upon detection of the error in the hydraulic brake device, (ii) a driver is alerted one of visually, acoustically, and haptically, upon detection of the error in the hydraulic brake device, or (iii) upon detection of the error, an error signal is generated which is displayed to the driver or is processed in a different manner.