Patent ID: 7543525
Filing Date: 2009-06-09
Classification: F16D

Abstract:
1. A clutch booster usable for an automobile having a clutch, comprising: a. a booster cylinder having a first end portion and an opposite, second end portion defining a booster cylinder chamber therebetween; b. an assistance cylinder having a first end portion and an opposite, second end portion defining an assistance cylinder chamber therebetween, wherein the first end portion is mounted onto the second end portion of the booster cylinder and the second end portion is formed with an opening; c. a piston plate having a first side and an opposite, second side, configured to be positioned in the booster cylinder chamber to divide the booster cylinder chamber into a first chamber portion and a second chamber portion; d. a piston rod having a first end portion mounted onto the second side of the piston plate, and an opposite, second end portion extending through the second end portion of the booster cylinder and into the assistance cylinder chamber; e. a push rod having a first end portion mounted onto the piston plate and an opposite, second end portion extending through the first end portion of the booster cylinder and engageable with a clutch of an automobile; f. a control valve unit located proximately to the first end portion of the assistance cylinder and the second end portion of the booster cylinder and adapted for regulating the pressure of the first chamber portion and the second chamber portion of the booster cylinder in response to the hydraulic fluid pressure in the assistance cylinder chamber; g. an electromagnetic solenoid coil attached to the second end portion of the booster cylinder; h. a ferromagnetic plunger having a first end portion mounted on the second side of the piston plate and an opposite, second end portion extending through the second end portion of the booster cylinder and into the electromagnetic solenoid coil; and i. a sensor electrically coupled with the electromagnetic coil for measuring inductance of the electromagnetic solenoid coil induced by the ferromagnetic plunger, wherein the inductance is associated with the status of the clutch of the automobile.