DRIVING FORCE DISTRIBUTION DEVICE FOR VEHICLE

摘要

PROBLEM TO BE SOLVED: To accurately control a tightening force of an electromagnetic clutch distributing a driving force without performing magnetic flux density feedback control requiring a highly precise magnetic flux density detection means. SOLUTION: Target magnetic flux densityϕt calculated by a target magnetic flux density calculation means M3 is converted to a target excited current It in a target excited current calculation means M4 to control tightening forces of electromagnetic clutches CL, CR distributing a torque between driving wheels of a vehicle. Since the relation betweenϕt and It is changed in accordance with the wear of friction engaging members of the electromagnetic clutches CL, CR when an air gap is reduced, the electromagnetic clutches CL, CR curry currents to detect the relation between magnetic flux densityϕand excited current I and calculate the target excited current It from the target magnetic flux densityϕt based on the relation when torque distribution control is not done as when a system is started. Since a magnetic flux density detection means is not required to detect dynamic changes of magnetic flux density, an inexpensive means can be used to reduce cost.