Driving force distribution device for vehicle

A driving force distribution device for a vehicle in which distribution of the driving force is carried out between driving wheels of the vehicle through electromagnetic clutches, the distribution device comprising:

• magnetic flux density detecting means for detecting a magnetic flux density which flows in the electromagnetic clutches;
• current detecting means for detecting an excitation current which flows in the electromagnetic clutches;
• and
• control means for determining target engagement forces of the electromagnetic clutches and controlling the engagement forces of the electromagnetic clutches;
• wherein the control means determines a state of wear of the electromagnetic clutches, corrects a target magnetic flux density corresponding to the target engagement force based on the determined state of wear of the electromagnetic clutches, converts the corrected target magnetic flux density into a target excitation current when the electromagnetic clutches are controlled for force distribution, and carries out current feedback control so that the excitation current flowing in the electromagnetic clutches detected by the current detecting means converges to the corrected target excitation current.

A driving force distribution device for a vehicle comprising:

• a magnetic flux density detector which detects magnetic flux density flowing in electromagnetic clutches;
• a current detector which detects excitation current flowing in the electromagnetic clutches;
• and
• a controller which determines target engagement forces of the electromagnetic clutches and controls the engagement forces of the electromagnetic clutches, distribution of the driving force being carried out between driving wheels of the vehicle through the electromagnetic clutches,
• wherein the controller determines a relationship between the excitation current and the magnetic flux density based on the magnetic flux density detected by the magnetic flux density detector when a predetermined excitation current is applied to the electromagnetic clutches when the clutches are not being controlled for driving force distribution, converts a target magnetic flux density corresponding to the target engagement force into a target excitation current based on the determined relationship between the excitation current and the magnetic flux density when the electromagnetic clutches are controlled for force distribution, and carries out current feedback control so that the excitation current flowing in the electromagnetic clutches detected by the current detector converges to the target excitation current.