Patent ID: 9423027
Filing Date: 2016-08-23
CPC Classification: F16H

Claim Text:
1. An apparatus for controlling a continuously variable transmission that is connected to a drive source mounted on a vehicle, changes speed of driving rotation of the drive source inputted through an input shaft at a continuously variable transmission ratio, and transmits the speed of driving rotation to driven wheels through an output shaft, having: a desired input shaft rotational speed calculator that calculates a desired input shaft rotational speed (NDRCMD (NDRMAP)) to be inputted to the continuously variable transmission through the input shaft at every predetermined control cycle based on at least a travel speed of the vehicle, and a transmission ratio controller that controls the transmission ratio of the continuously variable transmission such that an input shaft rotational speed (NDR) actually inputted to the continuously variable transmission through the input shaft becomes equal to the desired input shaft rotational speed, comprising: a comparator that compares a calculated value (NDRCMDZ) of the desired input shaft rotational speed calculated by the desired input shaft rotational speed calculator with a desired input shaft rotational speed upper limit (#NDRCMDMX) that is set in relation to an energy supply cut-off rotational speed (NEFC) defining energy supply cut-off to the drive source; a desired input shaft rotational speed outputter that determines the desired input shaft rotational speed upper limit (#NDRCMDMX) as the desired input shaft rotational speed (NDRCMD) when it is determined by the comparator that the calculated value (NDRCMDZ) does exceed the desired input shaft rotational speed upper limit (#NDRCMDMX), determines the calculated value (NDRCMDZ) as the desired input shaft rotational speed (NDRCMD) when it is determined by the comparator that the calculated value (NDRCMDZ) does not exceed the desired input shaft rotational speed upper limit (#NDRCMDMX), and outputs the determined value to the transmission ratio calculator, wherein the desired input shaft rotational speed outputter includes: a second comparator that compares a provisional value (NDRCMDY) of the calculated value (NDRCMDZ) of the desired input shaft rotational speed with a preceding cycle's desired input shaft rotational speed (NDRCMD) at a preceding control cycle; and a determiner that determines that a sum obtained by adding a difference (DNDRCMDY) between the provisional value (NDRCMDY) and the preceding cycle's desired input shaft rotational speed (NDRCMD) to the preceding cycle's desired input shaft rotational speed (NDRCMD) as the calculated value (NDRCMDZ) when it is determined by the second comparator that the provisional value (NDRCMDY) does not exceed the preceding cycle's desired input shaft rotational speed (NDRCMD) by or more than a desired input shaft rotational speed change amount upper limit (#DNDRMX), determines that a sum obtained by adding the desired input shaft rotational speed change amount upper limit (#DNDRMX) to the preceding cycle's desired input shaft rotational speed (NDRCMD) as the calculated value (NDRCMDZ) when it is determined by the second comparator that the provisional value (NDRCMDY) does exceed the preceding cycle's desired input shaft rotational speed (NDRCMD) by or more than the desired input shaft rotational speed change amount upper limit (#DNDRMX).