System and method for correction of vehicle speed lag in a continuously variable transmission (CVT) and associated vehicle
First Claim
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1. A method for compensation of speed lag from changing load conditions in a continuously variable transmission (CVT) vehicle, comprising;
- detecting and measuring true engine torque resulting from load changes placed on the vehicle engine;
calculating a true engine speed droop from the true engine torque, wherein engine droop rate, engine rated rpm, and engine rated torque are known fixed values, the true engine droop calculated as follows;
(engine droop at rated rpm)=(engine droop rate)×
(engine rated rpm)
(true engine droop/true engine torque)=(engine droop at rated rpm/engine rated torque)
(true engine droop)=(true engine torque)×
(engine droop at rated rpm/engine rated torque)
(true engine droop)=(true engine torque)×
[(engine droop rate)×
(engine rated rpm)]/(engine rated torque);
generating a compensated engine speed signal based on the calculated true engine speed droop; and
applying the compensated engine speed signal to the engine to produce a true engine speed corresponding to a target engine speed at the load condition corrected for true engine speed droop.
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Abstract
A method and associated system for compensation of vehicle speed lag resulting from changing load conditions in a continuously variable transmission (CVT) vehicle includes detecting and measuring true engine torque resulting from load changes placed on the vehicle engine. A true engine speed droop is calculated from the true engine torque. A compensated engine speed signal is generated based on the calculated true engine speed droop and is applied to the engine to produce a true engine speed that corresponds to a target engine speed at the load condition corrected for true engine speed droop.
25 Citations
15 Claims
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1. A method for compensation of speed lag from changing load conditions in a continuously variable transmission (CVT) vehicle, comprising;
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detecting and measuring true engine torque resulting from load changes placed on the vehicle engine; calculating a true engine speed droop from the true engine torque, wherein engine droop rate, engine rated rpm, and engine rated torque are known fixed values, the true engine droop calculated as follows;
(engine droop at rated rpm)=(engine droop rate)×
(engine rated rpm)
(true engine droop/true engine torque)=(engine droop at rated rpm/engine rated torque)
(true engine droop)=(true engine torque)×
(engine droop at rated rpm/engine rated torque)
(true engine droop)=(true engine torque)×
[(engine droop rate)×
(engine rated rpm)]/(engine rated torque);generating a compensated engine speed signal based on the calculated true engine speed droop; and applying the compensated engine speed signal to the engine to produce a true engine speed corresponding to a target engine speed at the load condition corrected for true engine speed droop. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A continuously variable transmission (CVT) vehicle having a control system for compensation of speed lag resulting from changing load conditions placed on the vehicle, said vehicle comprising:
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an engine; a drive train coupled to said engine, said drive train further comprising a CVT; a sensor operably configured along said drive train to detect and measure true engine torque resulting from load changes placed on said engine; and a control system in operable communication with said sensor and programmed to calculate a true engine speed droop from the true engine torque, generate a compensated engine speed signal based on the calculated true engine speed droop, and apply the compensated engine speed signal to said engine to produce a true engine speed corresponding to a target engine speed at the load condition corrected for true engine speed droop, wherein engine droop rate, engine rated rpm, and engine rated torque are known fixed values for said controller, said controller configured to calculate true engine droop as follows;
(engine droop at rated rpm)=(engine droop rate)×
(engine rated rpm)
(true engine droop/true engine torque)=(engine droop at rated rpm/engine rated torque)
(true engine droop)=(true engine torque)×
(engine droop at rated rpm/engine rated torque)
(true engine droop)=(true engine torque)×
[(engine droop rate)×
(engine rated rpm)]/(engine rated torque). - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification