Enhanced ratio control to establish CVT ratio with excellent precision
First Claim
1. A system for enhanced ratio control in a continuously variable transmission (CVT) including a ratio control element positionable by an actuator in response to an actuator command to establish various CVT ratios in the CVT, the system comprising:
- a measured CVT ratio generator obtaining information of an actual CVT ratio established in the CVT to give a measured value of CVT ratio;
a filter processing the measured value of CVT ratio in a manner to refine the information of the actual CVT ratio to give an estimated value of CVT ratio;
a command generator determining the actuator command such that the actuator command remains unaltered when a deviation of the estimated value of CVT ratio from a desired value of CVT ratio stays within a dead zone; and
a filter and command generator manager narrowing the dead zone to meet precision requirement upon determination that the desired value of CVT ratio has been accomplished and adjusting the filter to gain requirement for keeping the magnitude of signal at frequency of noise within the narrowed dead zone.
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Accused Products
Abstract
A system for enhanced ratio control in a continuously variable transmission (CVT) includes a ratio control element positionable by an actuator in response to an actuator command to establish various CVT ratios in the CVT. At least one sensor generates a train of pulses indicative of speed of rotation of a predetermined rotary member of the CVT. A measured CVT ratio generator derives information of an actual CVT ratio out of at least the train of pulses to give a measured value of CVT ratio. A filter processes the measured value of CVT ratio in a manner to refine the information of the actual CVT ratio to give an estimated value of CVT ratio. A command generator determines the actuator command such that the actuator command remains unaltered when a deviation of the estimated value of CVT ratio from a desired value of CVT ratio stays within a dead zone. A filter and command generator manager narrows the dead zone to meet precision requirement upon determination that the desired value of CVT ratio has been accomplished and adjusts filter gain at the filter in a manner to keep amplitude at frequency of noise that is contained in the measured value of CVT ratio within the narrowed dead zone.
104 Citations
22 Claims
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1. A system for enhanced ratio control in a continuously variable transmission (CVT) including a ratio control element positionable by an actuator in response to an actuator command to establish various CVT ratios in the CVT, the system comprising:
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a measured CVT ratio generator obtaining information of an actual CVT ratio established in the CVT to give a measured value of CVT ratio;
a filter processing the measured value of CVT ratio in a manner to refine the information of the actual CVT ratio to give an estimated value of CVT ratio;
a command generator determining the actuator command such that the actuator command remains unaltered when a deviation of the estimated value of CVT ratio from a desired value of CVT ratio stays within a dead zone; and
a filter and command generator manager narrowing the dead zone to meet precision requirement upon determination that the desired value of CVT ratio has been accomplished and adjusting the filter to gain requirement for keeping the magnitude of signal at frequency of noise within the narrowed dead zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for enhanced ratio control in a continuously variable transmission (CVT) including a ratio control element positionable by an actuator in response to an actuator command to establish various CVT ratios in the CVT, the method comprising:
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obtaining information of an actual CVT ratio established in the CVT to give a measured value of CVT ratio;
processing the measured value of CVT ratio in a manner to refine the information of the actual CVT ratio to give an estimated value of CVT ratio;
determining the actuator command such that the actuator command remains unaltered when a deviation of the estimated value of CVT ratio from a desired value of CVT ratio stays within a dead zone; and
narrowing the dead zone to meet precision requirement upon determination that the desired value of CVT ratio has been accomplished and adjusting the filter to gain requirement for keeping the magnitude of signal at frequency of noise within the narrowed dead zone. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A system for enhanced ratio control in a continuously variable transmission (CVT) including a ratio control element positionable by an actuator in response to an actuator command to establish various CVT ratios in the CVT, the system comprising:
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sensor means for generating a train of pulses indicative of speed of rotation of a predetermined rotary member of the CVT;
means for deriving information of an actual CVT ratio established in the CVT out of at least the train of pulses to give a measured value of CVT ratio;
filter means for processing the measured value of CVT ratio in a manner to refine the information of the actual CVT ratio to give an estimated value of CVT ratio;
means for determining the actuator command such that the actuator command remains unaltered when a deviation of the estimated value of CVT ratio from a desired value of CVT ratio stays within a dead zone;
means for narrowing the dead zone to meet precision requirement upon determination that the desired value of CVT ratio has been accomplished; and
adjusting filter gain at the filter means in a manner to keep amplitude at frequency of noise within the narrowed dead zone.
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22. A computer readable storage medium having stored thereon data indicative of instructions readable by a microprocessor for carrying out enhanced ratio control in a continuously variable transmission (CVT), the CVT including a ratio control element positionable by an actuator in response to an actuator command to establish various CVT ratios in the CVT, the computer readable storage medium comprising:
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instructions for obtaining information of an actual CVT ratio established in the CVT to give a measured value of CVT ratio;
instructions for processing the measured value of CVT ratio in a manner to refine the information of the actual CVT ratio to give an estimated value of CVT ratio;
instructions for determining the actuator command such that the actuator command remains unaltered when a deviation of the estimated value of CVT ratio from a desired value of CVT ratio stays within a dead zone; and
instructions for narrowing the dead zone to meet precision requirement upon determination that the desired value of CVT ratio has been accomplished and adjusting the filter to gain requirement for keeping the magnitude of signal at frequency of noise within the narrowed dead zone.
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Specification