Control of infinitely variable transmission
First Claim
1. A controller for an infinitely variable transmission, the infinitely variable transmission comprising an input shaft, a continuously variable transmission which outputs the rotation of the input shaft at an arbitrary speed ratio, a fixed speed ratio transmission which outputs the rotation of the input shaft at a fixed speed ratio, a differential mechanism having a first rotation element which rotates according to an output rotation of the continuously variable transmission, a second rotation element which rotates according to an output rotation of the fixed speed ratio transmission, and a third rotation element which varies a rotation direction and a rotation speed according to a difference between a rotation speed of the first rotation element and a rotation speed of the second rotation element, and an output shaft joined to the third rotation element, the controller comprising:
- a first sensor which detects the rotation speed of the input shaft;
a second sensor which detects the output rotation speed of the continuously variable transmission; and
a microprocessor programmed to;
calculate the rotation speed of the output shaft from the rotation speed of the input shaft and the output rotation speed of the continuously variable transmission; and
control the speed ratio of the continuously variable transmission based on the rotation speed of the output shaft.
1 Assignment
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Accused Products
Abstract
In an infinitely variable transmission, a continuously variable transmission (2) outputs the rotation of an input shaft (1) at an arbitrary speed ratio, and a fixed speed ratio transmission (3) outputs the rotation of the input shaft (1) at a fixed speed ratio. A planetary gear set (5) varies the rotation direction and speed of the output shaft (6) according to the difference of the output rotation speed of the fixed speed ratio transmission (2) and the output rotation speed of the continuously variable transmission (2). A sensor (81) which detects the rotation speed of the input shaft (1) and a sensor (82) which detects the output rotation speed of the continuously variable transmission (2) are provided, and a microprocessor (80) precisely calculates the rotation direction and rotation speed of the output shaft (6) from these rotation speeds.
144 Citations
12 Claims
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1. A controller for an infinitely variable transmission, the infinitely variable transmission comprising an input shaft, a continuously variable transmission which outputs the rotation of the input shaft at an arbitrary speed ratio, a fixed speed ratio transmission which outputs the rotation of the input shaft at a fixed speed ratio, a differential mechanism having a first rotation element which rotates according to an output rotation of the continuously variable transmission, a second rotation element which rotates according to an output rotation of the fixed speed ratio transmission, and a third rotation element which varies a rotation direction and a rotation speed according to a difference between a rotation speed of the first rotation element and a rotation speed of the second rotation element, and an output shaft joined to the third rotation element, the controller comprising:
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a first sensor which detects the rotation speed of the input shaft;
a second sensor which detects the output rotation speed of the continuously variable transmission; and
a microprocessor programmed to;
calculate the rotation speed of the output shaft from the rotation speed of the input shaft and the output rotation speed of the continuously variable transmission; and
control the speed ratio of the continuously variable transmission based on the rotation speed of the output shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A controller for an infinitely variable transmission, the infinitely variable transmission comprising an input shaft, a continuously variable transmission which outputs the rotation of the input shaft at an arbitrary speed ratio, a fixed speed ratio transmission which outputs the rotation of the input shaft at a fixed speed ratio, a differential mechanism having a first rotation element which rotates according to an output rotation of the continuously variable transmission, a second rotation element which rotates according to an output rotation of the fixed speed ratio transmission, and a third rotation element which varies a rotation direction and a rotation speed according to a difference between a rotation speed of the first rotation element and a rotation speed of the second rotation element, and an output shaft joined to the third rotation element, the controller comprising:
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means for detecting the rotation speed of the input shaft;
means for detecting the output rotation speed of the continuously variable transmission;
means for calculating the rotation speed of the output shaft from the rotation speed of the input shaft and the output rotation speed of the continuously variable transmission; and
means for controlling the speed ratio of the continuously variable transmission based on the rotation speed of the output shaft.
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12. A control method for an infinitely variable transmission, the infinitely variable transmission comprising an input shaft, a continuously variable transmission which outputs the rotation of the input shaft at an arbitrary speed ratio, a fixed speed ratio transmission which outputs the rotation of the input shaft at a fixed speed ratio, a differential mechanism having a first rotation element which rotates according to an output rotation of the continuously variable transmission, a second rotation element which rotates according to an output rotation of the fixed speed ratio transmission, and a third rotation element which varies a rotation direction and a rotation speed according to a difference between a rotation speed of the first rotation element and a rotation speed of the second rotation element, and an output shaft joined to the third rotation element, the method comprising:
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detecting the rotation speed of the input shaft;
detecting the output rotation speed of the continuously variable transmission;
calculating the rotation speed of the output shaft from the rotation speed of the input shaft and the output rotation speed of the continuously variable transmission; and
controlling the speed ratio of the continuously variable transmission based on the rotation speed of the output shaft.
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Specification