Vehicle driving system and control method thereof

摘要

One-way clutches OWC1 and OWC2 are provided on output sides of transmissions TM1 and TM2, and the transmissions TM1 and TM2 mechanically lock when the output member 121 of the one-way clutches OWC1 and OWC2 is reversely rotated to the backward side. Clutch mechanisms CL1 and CL2 are interposed between the output member 121 and a driving target member 11 connected to a driving wheel 2. According to uphill start conditions, a controller 5 makes any one of the clutch mechanisms CL1 and CL2 enter ON state when a vehicle-backward-movement prevention control is determined to be required and the controller 5 makes the clutch mechanisms CL1 and CL2 enter OFF state when the vehicle-backward-movement prevention control is determined to be not required. Thus, it is possible to provide a vehicle driving system capable of performing a hill hold assist function with a simple control.

主权项

1. A vehicle driving system, including:
an internal combustion engine portion which generates a rotational power; a transmission mechanism which shifts the rotational power generated in the internal combustion engine portion and outputs the shifted rotational power; a one-way clutch which is provided in an output portion of the transmission mechanism, the one-way clutch including:
an input member which receives the rotational power from the transmission mechanism;an output member; andan engagement member which makes the input member and the output member enter a locked state or a non-locked state, in which the input member and the output member enter the locked state when positive rotational speed of the input member exceeds the positive rotational speed of the output member to thereby transmit the rotational power of the input member to the output member; a driving target member which is connected to the output member of the one-way clutch, and is rotatable integrally with a driving wheel to transmit the rotational power of the output member to the driving wheel; a clutch mechanism which is interposed between the output member of the one-way clutch and the driving target member, and can transmit/disconnect power therebetween by being ON/OFF-controlled; a clutch mechanism controller which controls ON/OFF of the clutch mechanism; an uphill state detection unit which detects an uphill state of a vehicle; and a determination unit which detects whether or not a vehicle-backward-movement prevention control is required according to the uphill state detected by the uphill state detection unit, wherein the transmission mechanism includes:
an input shaft which receives the rotational power to rotate around an input center axis;plural first fulcrums which are provided in a circumferential direction around the input shaft at equal intervals, each first fulcrum being rotatable around the input center axis along with the input shaft while maintaining a variable eccentricity with respect to the input center axis;plural eccentric disks which rotate around the input center axis to have the first fulcrums as the respective centers;a one-way clutch which includes the output member which rotates around an output center axis separated from the input center axis, the input member which oscillates around the output center axis by receiving the rotational power from the outside, and the engagement member which makes the input member and the output member enter a locked state or a non-locked state with each other, transmits the rotational power of the input member to the output member when the positive rotational speed of the input member exceeds the positive rotational speed of the output member, and thereby converts the oscillating movement of the input member to the rotational movement of the output member;a second fulcrum which is provided on the input member separately from the output center axis;plural connection members which each has one end rotatably connected to the outer circumference of each eccentric disk about the first fulcrum and the other end rotatably connected to the second fulcrum provided on the input member of the one-way clutch to thereby transmit the rotational movement given to the eccentric disk from the input shaft to the input member of the one-way clutch as the oscillating movement thereof; anda gear-ratio variable mechanism which changes an oscillation angle of the oscillating movement transmitted to the input member of the one-way clutch from the eccentric disk by adjusting the eccentricity of the first fulcrum with respect to the input center axis to thereby change a gear ratio of transmitting the rotational power of the input shaft to the output member of the one-way clutch via the eccentric disk and the connection member, wherein the transmission mechanism is configured by a four bar linkage continuously variable transmission mechanism in which the eccentricity can be set to zero and the gear ratio can be set to infinity, wherein an output shaft of the internal combustion engine portion is connected to an input shaft of the continuously variable transmission mechanism, wherein a one-way clutch which is a component of the continuously variable transmission mechanism also serves as the one-way clutch which is provided between the transmission mechanism and the driving target member, and wherein the clutch mechanism controller makes the clutch mechanism enter ON state when the determination unit determines that the vehicle-backward-movement prevention control is required, and makes the clutch mechanism enter OFF state when the determination unit determines that the vehicle-backward-movement prevention control is not required.