Electric parking brake system
AssigneeAsmo Co., Ltd.
InventorsHidetoshi Suzuki, Eiji Ina
Life of this patent
Estimating the term…
Abstract
A sensor included in each brake system section detects the operation state of an electric parking brake in another brake system section. Based on the detected operation state, the sensor assumes the drive command that is to be output from a controller of the other brake system section to a controller of its own brake system section. The controller of one brake system receives an input of a drive command that is output from the controller of the other brake system. The controller of one brake system compares the assumed drive command (internal value) with the input drive command (input value). When the internal value and the input value do not match, the controller determines that an abnormality has occurred in the other brake system section.
Claims28
A parking brake system for applying braking force to wheels of a vehicle, the parking brake system including at least two independent brake system sections, each associated with one of the wheels, each of the brake system sections comprising:
- a motor;
- a parking brake, driven by the motor, for applying braking force to the associated wheel;
- a detector for detecting an operation state of the parking brake;
- and
- a controller for determining a drive command that is to be output to the motor in accordance with the operation state detected by the detector, the controller detecting the operation state of the parking brake in the other brake system section through the detector of the other brake system section, assuming the drive command that is to be output from the controller of the other brake system section, detecting the drive command actually output from the controller of the other brake system section, and comparing the actually detected drive command with the assumed drive command to determine abnormality of the other brake system section.
A parking brake system for applying braking force to a wheel of a vehicle, the brake system comprising:
- a motor;
- a parking brake, driven by the motor, for applying braking force to the wheel;
- a rotation sensor for detecting a rotation condition of the motor;
- a current sensor for detecting the amount of current supplied to the motor;
- an electric path through which current supplied to the motor flows;
- a host control unit for outputting a brake command signal;
- and
- a controller for controlling activation of the parking brake based on the brake command signal, the controller detecting abnormality of at least one of the parking brake, the electric path, the rotation sensor, and the current sensor based on at least one of the brake command signal, the detected rotation state, the detected current amount, and the elapsed time from when the motor is activated.
Dependencies are inferred from the claim text.