CVT control using state space based gain scheduling
First Claim
1. An engine powered wheeled machine having improved engine over speed and under speed protection, the machine comprising:
- a parallel path transmission having a gear train with first and second transmission inputs and a transmission output, and including a hydraulic variator having a variator output driving the first transmission input, the hydraulic variator having a variator pump and a variator motor, the displacement of the variator pump being controlled by a variator actuator;
an engine having an engine output driving the second transmission input and driving the variator pump; and
a controller for receiving one or more values indicative of one or more ranges of permissible engine speed, a value indicative of an actual engine speed, and a value indicative of the position of the variator actuator, the controller being configured to control the position of the variator actuator based on state space gain mapping to maintain the engine speed within the one or more ranges of permissible engine speed.
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Accused Products
Abstract
An engine powered wheeled machine having improved engine over speed and under speed protection includes a parallel path transmission having a gear train with first and second transmission inputs and a transmission output, and including a hydraulic variator having a variator output driving the first transmission input, the hydraulic variator having a variator pump and a variator motor, the displacement of the variator pump being controlled by a variator actuator. The machine further includes an engine having an engine output driving the second transmission input and driving the variator pump and a controller for receiving one or more values indicative of one or more ranges of permissible engine speed, a value indicative of an actual engine speed, and a value indicative of the position of the variator actuator, with the controller being configured to control the position of the variator actuator based on state space gain mapping to maintain the engine speed within the one or more ranges of permissible engine speed.
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Citations
20 Claims
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1. An engine powered wheeled machine having improved engine over speed and under speed protection, the machine comprising:
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a parallel path transmission having a gear train with first and second transmission inputs and a transmission output, and including a hydraulic variator having a variator output driving the first transmission input, the hydraulic variator having a variator pump and a variator motor, the displacement of the variator pump being controlled by a variator actuator; an engine having an engine output driving the second transmission input and driving the variator pump; and a controller for receiving one or more values indicative of one or more ranges of permissible engine speed, a value indicative of an actual engine speed, and a value indicative of the position of the variator actuator, the controller being configured to control the position of the variator actuator based on state space gain mapping to maintain the engine speed within the one or more ranges of permissible engine speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of controlling an engine powered wheeled machine to avoid engine over speed and engine under speed, the engine powered wheeled machine including a parallel path transmission powered by the engine and having a hydraulic variator driven by the engine, the displacement of the variator being controlled by a variator actuator, the method comprising:
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receiving one or more values indicative of one or more ranges of permissible engine speed; receiving a value indicative of an actual engine speed; receiving a value indicative of the position of the variator actuator; and controlling the position of the variator actuator based on state space gain mapping to maintain the engine speed within the one or more ranges of permissible engine speed. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A non-transient computer-readable medium having stored thereon computer-executable instructions for executing a method of controlling an engine powered wheeled machine to avoid engine over speed and engine under speed, the engine powered wheeled machine including a parallel path transmission powered by the engine and having a hydraulic variator driven by the engine, the displacement of the variator being controlled by a variator actuator, the computer-executable instructions comprising:
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instructions for receiving one or more values indicative of one or more ranges of permissible engine speed; instructions for receiving a value indicative of an actual engine speed; instructions for receiving a value indicative of the position of the variator actuator; and instructions for controlling the position of the variator actuator based on state space gain mapping to maintain the engine speed within the one or more ranges of permissible engine speed. - View Dependent Claims (18, 19, 20)
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Specification