System and Method for Correction of Vehicle Speed Lag in a Continuously Variable Transmission (CVT) and Associated Vehicle
First Claim
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;
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
17 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; 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, 9)
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10. 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. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification