CVT control system having variable power source speed
First Claim
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1. A powertrain control system associated with a power source and a CVT coupled to an output of the power source, comprising:
- a controller in communication with the power source and the CVT,wherein the controller includes a map with a plurality of speed modes including at least a first speed mode and a second speed mode, the controller being configured to transition from the first speed mode to the second speed mode as a result of a ground speed exceeding a threshold speed, the map including a power source speed limit for the plurality of speed modes, wherein the power source speed limit of the first speed mode varies as a function of ground speed for a constant machine load,the power source speed limit of the first speed mode for a constant machine load having;
a first value at zero ground speed, anda second value at a ground speed greater than zero, wherein the first value is greater than the second value,wherein for the first speed mode, the controller is configured to;
allow direct modulation of an actual power source speed up to, but not above, the power source speed limit via an operator input device.
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Abstract
A powertrain control system is disclosed. The powertrain control system may have a power source and a CVT coupled to an output of the power source. The powertrain control system may further have a controller in communication with the power source and the CVT. The controller may have a map with a plurality of speed modes, and, for at least one of the plurality of speed modes, the controller may be configured to vary an actual power source speed based on at least one of a CVT output speed or a ground speed.
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Citations
20 Claims
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1. A powertrain control system associated with a power source and a CVT coupled to an output of the power source, comprising:
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a controller in communication with the power source and the CVT, wherein the controller includes a map with a plurality of speed modes including at least a first speed mode and a second speed mode, the controller being configured to transition from the first speed mode to the second speed mode as a result of a ground speed exceeding a threshold speed, the map including a power source speed limit for the plurality of speed modes, wherein the power source speed limit of the first speed mode varies as a function of ground speed for a constant machine load, the power source speed limit of the first speed mode for a constant machine load having; a first value at zero ground speed, and a second value at a ground speed greater than zero, wherein the first value is greater than the second value, wherein for the first speed mode, the controller is configured to; allow direct modulation of an actual power source speed up to, but not above, the power source speed limit via an operator input device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A machine, comprising:
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a power source; a traction device; a CVT including a mechanical transmission and a hydrostatic transmission, the CVT coupled to transmit output of the power source to the traction device; a speed sensor located on an output of the CVT, the speed sensor being configured to measure a CVT output speed; and a controller in communication with the power source and the CVT, wherein the controller includes a map with a plurality of speed modes including at least a first speed mode, a second speed mode, and a third speed mode, the controller being configured to transition from the first speed mode to the second speed mode as a result of a CVT output speed exceeding a threshold speed, the map including a power source speed limit for the plurality of speed modes, wherein the power source speed limit of the first speed mode varies as a function of CVT output speed for a constant machine load, the power source speed limit of the first speed mode for a constant machine load having; a first value at zero CVT output speed, and a second value at a CVT output speed greater than zero, wherein the first value is greater than the second value, and wherein the controller is configured to scale the power source speed limit up based on an increase in the machine load, and wherein for the third speed mode, the controller is configured to increase an actual power source speed directly as a function of an increase in the CVT output speed. - View Dependent Claims (10, 11, 12, 13)
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14. A powertrain control system associated with an engine and a CVT coupled to an output of the engine, comprising:
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a controller in communication with the engine and the CVT, wherein the controller includes a map with a plurality of speed modes including a first speed mode and a second speed mode, the controller being configured to transition from the first speed mode to the second speed mode when a ground speed exceeds a threshold speed, the map including a power source speed limit for the plurality of speed modes, wherein the power source speed limit of the first speed mode varies as a function of ground speed for a constant machine load, the engine speed limit of the first speed mode for a constant machine load having; a first value at zero ground speed, and a second value at a ground speed greater than zero, wherein the first value is greater than the second value, wherein the controller is configured to scale the power source speed limit up based on an increase in the machine load, and wherein for the first speed mode the controller is configured to allow direct modulation of the actual engine speed up to, but not above, the power source speed limit via an operator input device. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification