ABUSE MODE TORQUE LIMITING CONTROL METHOD FOR A BALL-TYPE CONTINUOUSLY VARIABLE TRANSMISSION
First Claim
1. A computer-implemented system for a vehicle having an engine coupled to an infinitely variable transmission having a ball-planetary variator (CVP), the computer-implemented system comprising:
- a digital processing device comprising an operating system configured to perform executable instructions and a memory device;
a computer program including instructions executable by the digital processing device, the computer program comprising a software module configured to manage a plurality of operating conditions of the vehicle;
a plurality of sensors comprising;
a CVP input speed sensor configured to sense a CVP input speed;
an accelerator pedal position sensor configured to sense an accelerator pedal position,a CVP output speed sensor configured to sense a CVP output speed, wherein the software module determines a current CVP speed ratio based on the CVP input speed and the CVP output speed; and
an oil temperature sensor configured to sense an oil temperature;
wherein the software module is configured to determine a commanded engine torque limit based on the CVP speed ratio, the accelerator pedal position, and the engine oil temperature; and
wherein the software module is configured to control an engine torque based on the commanded engine torque limit.
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Accused Products
Abstract
Provided herein is a control system for a multiple-mode continuously variable transmission having a ball planetary variator operably coupled to multiple-mode gearing. The control system has a transmission control module configured to receive a plurality of electronic input signals, and to determine a mode of operation from a plurality of control ranges based at least in part on the plurality of electronic input signals. The control system includes an engine torque limit sub-module adapted to command an engine torque limit based at least in part on the operating conditions of the continuously variable transmission.
32 Citations
20 Claims
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1. A computer-implemented system for a vehicle having an engine coupled to an infinitely variable transmission having a ball-planetary variator (CVP), the computer-implemented system comprising:
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a digital processing device comprising an operating system configured to perform executable instructions and a memory device; a computer program including instructions executable by the digital processing device, the computer program comprising a software module configured to manage a plurality of operating conditions of the vehicle; a plurality of sensors comprising; a CVP input speed sensor configured to sense a CVP input speed; an accelerator pedal position sensor configured to sense an accelerator pedal position, a CVP output speed sensor configured to sense a CVP output speed, wherein the software module determines a current CVP speed ratio based on the CVP input speed and the CVP output speed; and an oil temperature sensor configured to sense an oil temperature; wherein the software module is configured to determine a commanded engine torque limit based on the CVP speed ratio, the accelerator pedal position, and the engine oil temperature; and wherein the software module is configured to control an engine torque based on the commanded engine torque limit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A computer-implemented system for a vehicle having an engine coupled to an infinitely variable transmission having a ball-planetary variator (CVP), the computer-implemented system comprising:
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a digital processing device comprising an operating system configured to perform executable instructions and a memory device; a computer program including instructions executable by the digital processing device, the computer program comprising a software module configured to manage a plurality of vehicle operating conditions; a plurality of sensors comprising; a CVP input speed sensor configured to sense a CVP input speed; and a CVP output speed sensor configured to sense a CVP output speed, wherein the software module determines a current CVP speed ratio based on the CVP input speed and the CVP output speed; wherein the software module includes a plurality of calibration maps, each calibration map configured to store values of a commanded engine torque limit based at least in part on the CVP speed ratio. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A computer-implemented method for controlling engine torque in a vehicle, wherein the vehicle comprises an engine coupled to an infinitely variable transmission (IVT) having a ball-planetary variator (CVP), a plurality of sensors, and a computer-implemented system comprising
a digital processing device comprising an operating system configured to perform executable instructions and a memory device, and a computer program including the instructions executable by the digital processing device, wherein the computer program comprises a software module; - the method comprising;
controlling engine torque by one or more of the plurality of sensors sensing vehicle parameters comprising;
an accelerator pedal position, a CVP input speed, a CVP output speed, a current engine torque;the software module determining a first engine torque limit based on a speed ratio droop of the CVP, wherein the speed ratio droop is based on the CVP input speed and the CVP output speed; the software module determining a second engine torque limit based on the CVP input speed; the software module determining a third engine torque limit based on the accelerator pedal position; the software module determining a minimum value among the first engine torque limit, the second engine torque limit, and the third engine torque limit; and the software module commanded an engine torque based on the minimum value. - View Dependent Claims (19, 20)
- the method comprising;
Specification