Four-wheel-drive vehicle
First Claim
1. A four-wheel-drive vehicle comprising:
- main drive wheels and auxiliary drive wheels, to which a drive force of a drive source is transferred;
a drive force transfer device that is capable of blocking transfer of the drive force to the auxiliary drive wheels;
a hydraulic unit that supplies a working fluid to the drive force transfer device; and
a control device that controls the hydraulic unit, wherein;
the four-wheel-drive vehicle is switchable between a four-wheel-drive state, in which the drive force is transferred to the main drive wheels and the auxiliary drive wheels, and a two-wheel-drive state, in which the drive force is transferred to only the main drive wheels;
the hydraulic unit has an electric motor, to which a motor current is supplied from the control device, and a pump that is actuated by rotation of a motor shaft of the electric motor;
the drive force transfer device has a piston that is moved by a pressure of a working fluid supplied from the pump to a cylinder, and a clutch that is switchable between a transfer state, in which transfer of the drive force to the auxiliary drive wheels is allowed, and a blocked state, in which such transfer is blocked, in accordance with movement of the piston; and
the control device detects presence or absence of an abnormality of a flow passage forming member, which forms a flow passage for the working fluid, in accordance with at least any of the motor current and a number of revolutions of the motor shaft at the time when the motor shaft is rotated by applying a voltage to the electric motor.
1 Assignment
0 Petitions
Accused Products
Abstract
In a four-wheel-drive vehicle, a hydraulic unit has an electric motor, to which a motor current is supplied from a control device, and a pump that is actuated by rotation of a motor shaft, and a drive force transfer device has a piston that is moved by the pressure of working oil discharged from the pump, and a friction clutch that is switchable between a transfer state and a blocked state, in which transfer of a drive force to rear wheels is allowed and blocked, respectively, in accordance with movement of the piston. The control device detects the presence or absence of an abnormality of a flow passage forming member, which forms a flow passage for working oil, in accordance with at least any of a motor current and the number of revolutions of a motor shaft at the time when the motor shaft is rotated by applying a voltage to the electric motor.
4 Citations
13 Claims
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1. A four-wheel-drive vehicle comprising:
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main drive wheels and auxiliary drive wheels, to which a drive force of a drive source is transferred; a drive force transfer device that is capable of blocking transfer of the drive force to the auxiliary drive wheels; a hydraulic unit that supplies a working fluid to the drive force transfer device; and a control device that controls the hydraulic unit, wherein; the four-wheel-drive vehicle is switchable between a four-wheel-drive state, in which the drive force is transferred to the main drive wheels and the auxiliary drive wheels, and a two-wheel-drive state, in which the drive force is transferred to only the main drive wheels; the hydraulic unit has an electric motor, to which a motor current is supplied from the control device, and a pump that is actuated by rotation of a motor shaft of the electric motor; the drive force transfer device has a piston that is moved by a pressure of a working fluid supplied from the pump to a cylinder, and a clutch that is switchable between a transfer state, in which transfer of the drive force to the auxiliary drive wheels is allowed, and a blocked state, in which such transfer is blocked, in accordance with movement of the piston; and the control device detects presence or absence of an abnormality of a flow passage forming member, which forms a flow passage for the working fluid, in accordance with at least any of the motor current and a number of revolutions of the motor shaft at the time when the motor shaft is rotated by applying a voltage to the electric motor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification