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US 10,245,950 B2Granted
Control device of vehicular four-wheel drive system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsDaichi Shimizu, Shunro Fukada, Satoshi Shimizu, Masayuki Arai
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Abstract
When a vehicle is switched from a two-wheel-drive mode to a four-wheel-drive mode during turning, rotation of a Rr dog clutch is synchronized by a synchro mechanism. Rotation of a Fr dog clutch is synchronized, by controlling coupling torque of a control coupling that transmits power to a rear wheel that provides an outer wheel during turning. Thus, rotation of the Fr dog clutch is also synchronized, so that shock at the time of engagement of the Fr dog clutch can be suppressed.
Claims5
A control device for a four-wheel drive system of a vehicle,
- the four-wheel drive system including
- a transfer case configured to distribute a part of drive power generated from a drive source to left and right secondary drive wheels,
- a differential mechanism coupled to the left and right secondary drive wheels,
- a propeller shaft that transmits power delivered from the transfer case, to the differential mechanism,
- a first meshing clutch provided in the transfer case, the first meshing clutch being configured to selectively permit and inhibit power transmission between the drive source and the propeller shaft, and
- a second meshing clutch configured to selectively permit and inhibit power transmission between the propeller shaft and the differential mechanism,
- the differential mechanism including a pair of control couplings configured to adjust transmission torque transmitted to the left and right secondary drive wheels,
- one of the first meshing clutch and the second meshing clutch including a synchro mechanism,
- the control device comprising
- an electronic control unit configured to, when the four-wheel drive system is switched from a two-wheel drive state in which the first meshing clutch and the second meshing clutch are released to a four-wheel drive state in which the first meshing clutch and the second meshing clutch are engaged during turning,
- synchronize rotation of the one of the first meshing clutch and the second meshing clutch including the synchro mechanism, by means of the synchro mechanism, and
- synchronize rotation of the other of the first meshing clutch and the second meshing clutch, by controlling coupling torque of one of the pair of control couplings which transmits power to one of the left and right secondary drive wheels which provides an outer wheel.
9 more elements
Dependencies are inferred from the claim text.