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US 6,311,113 B1Granted
Control method for adjusting the transmission ratio of a CVT
AssigneeZF Batavia, L.L.C.
InventorsWolfgang Danz, Andreas Piepenbrink, Andreas Schwenger
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AssigneeZF Batavia, L.L.C.
InventorsWolfgang Danz, Andreas Piepenbrink, Andreas Schwenger
Estimating the term…
A method for ratio control for a continuously variable belt drive transmission with electrohydraulic control by means of a control loop with a linear PID controller with the theoretical ratio of the variator iv_theor. as command variable, the actual ratio iv as control variable and the ratio-change speed as correcting variable wherein the correcting variable delivered by the PID controller is limited to limit values subject to the design for an upshift and a downshift, a correction member is used which, taking into consideration internal and external system variables, corrects with the aid of a physicomathematical pattern the pattern error generated wherein to the equation based on the physicomathematical pattern k ( iv ) · ⅆ iv ⅆ t = p 2 · A 2 · k p k s - p 1 · A 1 with: k ( iv ) : ratio - dependent damping coefficient ⅆ iv / ⅆ t : variable gradient ( ratio gradient ) p 1 : control pressure primary side p 2 : control pressure secondary side A 1 : pulley surface primary side A 2 : pulley surface secondary side k p k s : adjusting force ratio a correction term ⅆ iv ⅆ t [RightBracketingBar] theor . corr . is added and as standard for the ratio gradients the following equation is used: ⅆ iv ⅆ t [LeftBracketingBar] theor . = 1 k ( iv ) ( p 2 · A 2 · k p k s - p 1 · A 1 ) + ⅆ iv ⅆ t [RightBracketingBar] theor . corr .
Method for ratio control for a continuously variable belt drive transmission with electrohydraulic control by means of a control loop having a linear PID controller with the theoretical ratio of the variator (iv_theor.) as command variable, the actual ratio iv as control variable and the ratio-change speed as correcting variable wherein the correcting variable delivered by the PID controller is limited to limit values subject to the design for an upshift and a downshift, characterized in that a correction member is used which, taking into consideration internal and external system variables, corrects the generated pattern error with the aid of a physicomathematical pattern wherein to the equation based on the physicomathematical pattern k ( iv ) · ⅆ iv ⅆ t = p 2 · A 2 · k p k s - p 1 · A 1 with:
Dependencies are inferred from the claim text.