Continuously variable planetary gear set
First Claim
Patent Images
1. A drive train comprising:
- an internal combustion engine (ICE) whose output torque is controlled based on a required output power;
a continuously variable transmission (CVT), coupled to the ICE and having a rotatable cage configured to rotate about a longitudinal axis of the CVT, wherein an input rotation speed of the CVT is controlled based on the required output power;
a controller configured to perform the following steps;
determine a final target operating point of the ICE based on output torque and the input rotation speed, on the basis of the required output power;
set a transient operating point of the ICE to one of possible operating points that can be achieved within a predetermined period of time such that the transient operating point is closer to the final target operating point than the current operating point of the ICE; and
control the output torque and the input rotation speed of the CVT to operate the ICE at the set transient operating point.
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Abstract
A continuously variable planetary gear set is described having a generally tubular idler, a plurality of balls distributed radially about the idler, each ball having a tiltable axis about which it rotates, a rotatable input disc positioned adjacent to the balls and in contact with each of the balls, a rotatable output disc positioned adjacent to the balls opposite the input disc and in contact with each of the balls such that each of the balls makes three-point contact with the input disc, the output disc and the idler, and a rotatable cage adapted to maintain the axial and radial position of each of the balls, wherein the axes of the balls are oriented by the axial position of the idler.
289 Citations
20 Claims
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1. A drive train comprising:
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an internal combustion engine (ICE) whose output torque is controlled based on a required output power; a continuously variable transmission (CVT), coupled to the ICE and having a rotatable cage configured to rotate about a longitudinal axis of the CVT, wherein an input rotation speed of the CVT is controlled based on the required output power; a controller configured to perform the following steps; determine a final target operating point of the ICE based on output torque and the input rotation speed, on the basis of the required output power; set a transient operating point of the ICE to one of possible operating points that can be achieved within a predetermined period of time such that the transient operating point is closer to the final target operating point than the current operating point of the ICE; and control the output torque and the input rotation speed of the CVT to operate the ICE at the set transient operating point. - View Dependent Claims (2, 3, 4)
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5. A drive train comprising:
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an internal combustion engine (ICE) whose output torque is controlled based on a required output power; a continuously variable transmission (CVT), coupled to the ICE and having a rotatable cage configured to rotate about a longitudinal axis of the CVT, wherein an input rotation speed of the CVT is controlled based on the required output power; and a controller configured to perform the following steps; determine a final target operating point of the ICE based on output torque and the input rotation speed, on the basis of the required output power; set a transient operating point of the ICE to one of possible operating points that can be achieved within a predetermined period of time such that the transient operating point is closer to the final target operating point than the current operating point of the engine; and control the output torque and the input rotation speed of the CVT so as to operate the ICE at the set transient operating point; and wherein the controller sets the transient operating point on the basis of a delay in a change of a speed ratio of the continuously variable transmission. - View Dependent Claims (6)
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7. A drive train comprising:
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an internal combustion engine (ICE) whose output torque is controlled based on a required output power; a continuously variable transmission (CVT) having an input rotation speed that is controlled based on the required output power, the CVT coupled to the ICE and having a rotatable cage configured to rotate about a longitudinal axis of the CVT; a controller configured to perform the following step; determine a final target operating point of the ICE based on the output torque and the input rotation speed, on the basis of the required output power; set a transient operating point of the ICE to one of possible operating points that can be achieved within a predetermined period of time such that the transient operating point is closer to the final target operating point than the current operating point of the engine; control the output torque and the input rotation speed of the CVT so as to operate the ICE at the set transient operating point; and set the transient operating point to one of possible operating points which is reached when the largest amounts of changes occur in the output torque and the input rotation speed within the predetermined period of time. - View Dependent Claims (8, 9, 10)
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11. A method of controlling a vehicle, the method comprising the steps of:
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providing an internal combustion engine (ICE) whose output torque is controlled based on a required output power; providing a continuously variable transmission (CVT), coupled to the ICE and having a rotatable cage configured to rotate about a longitudinal axis of the CVT, wherein an input rotation speed of the CVT is controlled based on the required output power; determining a final target operating point of the ICE based on the output torque and the input rotation speed, on the basis of the required output power; setting a transient operating point of the engine to one of possible operating points that can be achieved within a predetermined period of time such that the transient operating point is closer to the final target operating point than the current operating point of the engine; and controlling the output torque and the input rotation speed of the continuously variable transmission to operate the internal combustion engine at the set transient operating point. - View Dependent Claims (12, 13, 14)
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15. A drive train controller comprising:
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means for determining a final target operating point of an internal combustion engine (ICE) based on an output torque and an input rotation speed of a continuously variable transmission (CVT), wherein the CVT comprises a rotatable cage configured to rotate about a longitudinal axis of the CVT, on the basis of a required output power; means for setting a transient operating point of the ICE to one of possible operating points that can be achieved within a predetermined period of time such that the transient operating point is closer to the final target operating point than the current operating point of the ICE; and means for controlling the output torque and the input rotation speed of the CVT to operate the ICE at the set transient operating point.
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16. A drive train comprising:
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an internal combustion engine (ICE); a continuously variable transmission (CVT) coupled to the ICE, the CVT having a rotatable cage configured to rotate about a longitudinal axis of the CVT; and a controller configured to perform the following steps; based on a required output power of the ICE, determine a final target operating point of the ICE based on an output torque and an input rotation speed of the CVT; set a transient operating point of the ICE to one of possible operating points that can be achieved within a predetermined period of time such that the transient operating point is closer to the final target operating point than the current operating point of the ICE; and control the output torque and the input rotation speed of the CVT to operate the ICE at the set transient operating point. - View Dependent Claims (17, 18, 19, 20)
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Specification