摘要:
A clutch control device for a four-wheel drive vehicle is provided, the device being able to suppress the elevation of the temperature of the oil supplied to a friction clutch during two-wheel drive travel when the friction clutch is released. The clutch control device is configured such that the device is mounted in a four-wheel drive vehicle provided with a dog clutch (8) and an electronic control coupling (16) housed in a coupling case (25); when a disconnected, two-wheel drive mode in which the dog clutch (8) and the electronic control coupling (16) are released is selected, a passage opening (25e) provided in the coupling case (25) is closed and lubrication oil (O) is retained in an oil chamber (25c) defined with respect to a clutch chamber (25b) that houses the electronic control coupling (16). When oil stirring conditions are met thereafter, the passage opening (25e) is opened and the lubrication oil (O) is allowed to flow into the clutch chamber (25b) from the oil chamber (25c).
摘要:
When an engagement of the dog clutch is requested, the dog clutch is engaged while allowing satisfactory sound vibration performance regardless of whether the main drive wheels are in a non-slip state or a slip state. The system for transmitting drive force to the left and right rear wheels (19, 20) comprises a dog clutch (8) and an electronically controlled coupling (16), and a 4WD control unit (34) controls the engagement and disengagement of the dog clutch (8) and the engagement and disengagement of the electronically controlled coupling (16). In this clutch control device for a four-wheel drive vehicle, when there is a request to engage the dog clutch (8) from a disengaged state, the 4WD control unit (34), during the engagement control of the electronically controlled coupling (16), first controls the engagement of the electronically controlled coupling (16), monitors the change gradient ”N/dt of the clutch rotational speed difference ”N of the dog clutch (8) and starts engagement of the dog clutch (8) when it is determined that the gradient of the clutch rotational speed difference ”N is no longer decreasing.
摘要:
Provided is a clutch control device for a 4-wheel drive vehicle, which can optimize the synchronization speed of a dog clutch and achieve an improvement in vehicle stability and in vehicle sound and vibration levels. To this end, this clutch control device for a 4-wheel drive vehicle is characterized in that a system for transmitting drive force to the left and right rear wheels (19, 20) comprises a drive branch-side transmission system path and an auxiliary drive wheel-side transmission system path which sandwich a rear differential (15), and a 4WD control unit (34) controls the engagement and release of an electronically controlled coupling (16) and a dog clutch (8) which are arranged separately in the two paths. The 4WD control unit (34) comprises a synchronization speed control unit (100), and at the time of transition from a disconnected, two-wheel drive mode, in which the electronically controlled coupling (16) and the dog clutch (8) are released, to a connected, four-wheel drive mode, in which the electronically controlled coupling (16) and the dog clutch (8) are engaged, the synchronization speed control unit (100) reduces the synchronization speed of the dog clutch (8) more during vehicle deceleration than when the vehicle is not decelerating.
摘要:
The present invention provides a clutch control device of a four-wheel drive vehicle in which it is possible to shorten the time for transitioning from a two-wheel drive mode to a four-wheel drive mode when moving uphill, and to improve the stability of transmitting drive force to the road surface. Therefore, the present invention is a clutch control device of a four-wheel drive vehicle, characterized in that a 4WD control unit (34) controls the engagement and disengagement of a dog clutch (8) and an electrically controlled coupling (16) which are arranged separately in a drive branch-side transmission system path and an auxiliary drive wheel-side transmission system path that sandwich a rear differential (15), in a system for transmitting drive force to left and right rear wheels (19, 20), wherein the 4WD control unit comprises, as two-wheel drive modes, a disconnected two-wheel drive mode in which the dog clutch (8) and the electrically controlled coupling (16) are released, and a standby two-wheel drive mode in which the dog clutch (8) is engaged and the electrically controlled coupling (16) is released; and a switch to the standby two-wheel drive mode is carried out when uphill movement is detected during the disconnected two-wheel drive mode.
摘要:
Provided is a clutch control system for a four-wheel drive vehicle, the system allows a prompt switching from a two-wheel drive traveling to a four-wheel drive traveling. A clutch control system includes: a dog clutch (8) that separates a rear wheel drive system from a front wheel drive system by releasing the dog clutch; an electronically controlled coupling (16) that distributes the driving force of a transverse engine (1) to left and right rear wheels (19, 20) in accordance with a clutch connection capacity; and a 4WD control unit (34) that switches the drive mode to one of a disconnect two-wheel drive mode with the dog clutch (8) and the electronically controlled coupling (16) released, a connect four-wheel drive mode with the dog clutch (8) and the electronically controlled coupling (16) connected, and a stand-by two-wheel drive mode with the dog clutch (8) connected while the electronically controlled coupling (16) released.
摘要:
To achieve a balance between ensuring four-wheel drive performance during re-acceleration and reducing friction in a drive transmission system during braking when the foot is lifted off an accelerator in a low-speed region when the connected, four-wheel drive mode has been selected. The system for transmitting drive force to the left and right rear wheels (19, 20) comprises a dog clutch (8) and an electronically controlled coupling (16); a 4WD control unit (34) is provided, which controls the engagement and disengagement of the dog clutch (8) and the engagement and disengagement of the electronically controlled coupling (16). In this clutch control device for a four-wheel drive hybrid vehicle, the four-wheel drive hybrid vehicle includes a "disconnected, two-wheel drive mode" and a "connected, four-wheel drive mode." When the foot is lifted off an accelerator in a low-speed region when the "connected, four-wheel drive mode" is selected, the 4WD control unit (34) maintains the "connected, four-wheel drive mode" while the brakes are not depressed, and shifts the mode to the "disconnected, two-wheel drive mode" when the brakes are depressed.
摘要:
To achieve a balance between ensuring four-wheel drive performance, on the one hand, and energy conservation performance, on the other, when there is a request to engage the dog clutch. The system for transmitting drive force to the left and right rear wheels (19, 20) comprises a dog clutch (8) and an electronically controlled coupling (16); a 4WD control unit (34) is provided, which carries out the control of starting the engagement of the dog clutch (8), which is in a disengaged state, after placing the dog clutch (8) in a rotationally synchronized state by engaging the electronically controlled coupling (16) and increasing the output rotation thereof, when there is a request to engage the dog clutch (8). In this clutch control device for a four-wheel drive vehicle, the 4WD control unit (34) sets the engagement start timing of the electronically controlled coupling (16) when a transition is made to the "connected, four-wheel drive mode" to an earlier timing compared to when a transition is made to the "standby two-wheel drive mode," when there is a request to engage the dog clutch (8) while in a state in which the "disconnected, two-wheel drive mode" is selected.
摘要:
The present invention provides a clutch control device for a four-wheel drive vehicle, said device making it possible to reliably engage a gear clutch. To this end, the present invention is configured as a clutch control device for a four-wheel drive vehicle, said device being provided with a 4WD control unit (34) that performs engagement/release control of a dog clutch (8), which separates a transmission system for driving force to the left and right rear wheels (19, 20) from a transmission system for driving force to the left and right front wheels (6, 7), and engagement/release control of an electronically controlled coupling (16), which distributes a portion of the driving force from an engine (1) to the left and right rear wheels (19, 20); that is switchable between a two-wheel drive mode and a four-wheel drive mode; and that performs control, when engaging the dog clutch (8), wherein the dog clutch (8) is engaged after the electronically controlled coupling (16) is engaged and the dog clutch (8) is synchronized. Said device is characterized in that, when engaging the dog clutch (8), the 4WD control unit (34) reduces the transmission torque of the electronically controlled coupling (16) when a dog clutch (8) engagement standby state is detected.