Drive control device

A drive control device of a drive system,

• wherein the drive system comprises:
• a power source that generates a power for a vehicle to travel;
• and
• a four-joint link mechanism type continuously variable transmission comprising:
• an input shaft that rotates around an input center axis by receiving a rotational power from the power source;
• an eccentric disk that includes, at its center, a first supporting point whose eccentricity with respect to the input center axis can be varied, the eccentric disk being rotated together with the input shaft around the input center axis while maintaining the eccentricity;
• a one-way clutch comprising:
• an output member that rotates around an output center axis located away from the input center axis;
• an input member that swings around the output center axis by receiving a rotational power from outside;
• and
• an engagement member that allows the input member and the output member to be in a locked state or an unlocked state,
• wherein the one-way clutch is configured to transmit a rotational power inputted to the input member to the output member so as to convert a swing movement of the input member into a rotational movement of the output member, when a forward rotational speed of the input member exceeds a forward rotational speed of the output member;
• a connection member configured to transmit a rotational movement, which is provided to the eccentric disk from the input shaft, to the input member of the one-way clutch as a swing movement of the input member, wherein one end of the connection member is connected to an outer periphery of the eccentric disk so as to be rotatable around the first supporting point, and the other end of the connection member is rotatably connected to a second supporting point which is located on the input member of the one-way clutch and away from the output center axis;
• an actuator configured to adjust the eccentricity of the first supporting point with respect to the input center axis so as to change a swing angle of the swing movement transmitted to the input member of the one-way clutch from the eccentric disk,
• wherein the continuously variable transmission has a transmission ratio variable mechanism in which a transmission ratio between the rotational power inputted to the input shaft and the rotation power transmitted to the output member of the one-way clutch via the eccentric disk and the connection member is changed, and the transmission ratio can be set to infinity by setting the eccentricity such that the rotational power is not transmitted to the output member,
• wherein when an output speed of the continuously variable transmission is lower than a threshold value, the drive control device is configured to limit at least one of the transmission ratio of the continuously variable transmission and an output of the power source, and
• wherein the threshold value is an output speed of the continuously variable transmission at an intersection point of a maximum driving line and a torque transmission line, wherein the maximum driving line represents an output torque to obtain a maximum driving force for each output speed of the continuously variable transmission, and wherein the torque transmission line represents an output torque for each output speed of the continuously variable transmission when the swing angle of the input member of the one-way clutch is a maximum torsion angle.