The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 19, 2003
Filed:
Nov. 01, 2000
Other;
Abstract
A pair of shoes are expanded by driving an electric brake motor. Due to the friction engagement of the shoes with a drum inner peripheral surface, a braking force is applied to a wheel. An actual braking torque is detected by a strain sensor that detects the load applied to an anchor pin. Through a feedback control using the actual braking torque, the electric motor is driven and controlled so that the actual braking torque becomes equal to a target braking torque that is determined in accordance with the amount of operation of a brake pedal. When the actual braking torque is undetectable, for example, during a stop of a vehicle, the electric motor is driven and controlled through an actuating force control using the current through the electric motor that is detected by a motor current sensor. The braking torque control apparatus controls the actual braking torque to a magnitude corresponding to brake operation, regardless of the magnitude of the coefficient of friction between a friction engagement member and brake rotor. Even when the braking torque is undetectable, the apparatus executes brake control in a good manner.