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:
Apr. 02, 2013
Filed:
Oct. 22, 2009
Masaki Mita, Chiryu, JP;
Ryohei Shigeta, Anjo, JP;
Tomoaki Kato, Kariya, JP;
JTEKT Corporation, Osaka-shi, JP;
Abstract
A vehiclehas a torque coupling, which is located in a driving power transmission system for transmitting the torque of an engineto front and rear wheels. The torque couplingchanges the torque distribution by adjusting the frictional engaging force of an electromagnetic clutch. The vehiclealso has a 4WD ECU(CPU), which controls the operation of the torque couplingbased on the driving state. The 4WD ECU(CPU) estimates a transfer case oil temperature Tptu. When the transfer case oil temperature Tptu is higher than or equal to a first predetermined transfer case oil temperature KTptu, the 4WD ECUexecutes overheat prevention control. When the deviation ΔA between an estimated vehicle acceleration Ae, which is computed based on a predetermined vehicle weight M and a driveline torque τd of the engine, and the actual vehicle acceleration Av is greater than or equal to a first predetermined deviation KΔA, the 4WD ECU(CPU) estimates the transfer case oil temperature Tptu to be higher. This allows the control mode of the torque couplingto be smoothly switched to the overheat prevention control.