Control apparatus for continuously variable transmission
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHiroji Taniguchi, Katsumi Kono, Kenji Matsuo, Masato Terashima, Hiroki Kondo
Life of this patent
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Abstract
Estimated change in operating fluid volume within a primary fluid chamber over a predetermined period of time during gear change operation is calculated using a physical model. On the other hand, detected change in operating fluid volume within the primary fluid chamber over this predetermined period of time is calculated. Then the deviation of the detected change from the estimated change is calculated, and learning and correction of the difference between the characteristic stored in an electronic control unit and that of an actual flow control unit are performed based on this deviation.
Claims58
A control apparatus for a continuously variable transmission which controls the gear ratio by using an operating fluid supply and discharge device to change the flow rate of operating fluid entering and leaving a gear change mechanism, the control apparatus comprising:
- a hydraulic control signal calculation device which calculates a hydraulic control signal output to the operating fluid supply and discharge device;
- a fluid volume detection device which detects a change in operating fluid volume within the gear change mechanism over a predetermined period of time during which gear change operation is in progress;
- a fluid volume estimation device which estimates a change in operating fluid volume within the gear change mechanism over the predetermined period of time, based on the hydraulic control signal;
- and
- a correction device which corrects a hydraulic control signal to flow control output characteristic map for the operating fluid supply and discharge device, based on the deviation of the value detected by the fluid volume detection device from the value estimated by the fluid volume estimation device.
A control apparatus for a continuously variable transmission which controls gear ratio by using an operating fluid supply and discharge device to change the flow rate of operating fluid entering and leaving a gear change mechanism, the control apparatus comprising:
- a hydraulic control signal calculation device which calculates a hydraulic control signal output to the operating fluid supply and discharge device;
- a fluid flow detection device which detects the flow rate of operating fluid entering and leaving the gear change mechanism at a predetermined timing during the gear change operation;
- a fluid flow estimation device which estimates the flow rate of operating fluid entering and leaving the gear change mechanism at the predetermined timing based on the hydraulic control signal;
- and
- a correction device which corrects a hydraulic control signal to flow control output characteristic map for the operating fluid supply and discharge device, based on the deviation of the value detected by the fluid flow detection device from the value estimated by the fluid flow estimation device.
A control apparatus for a continuously variable transmission which controls the gear ratio by using an operating fluid supply and discharge device to change the flow rate of operating fluid, the control apparatus comprising:
- a feedforward control device which uses a physical model to calculate a feedforward manipulated variable to be sent to the operating fluid supply and discharge device;
- and
- a correction device which corrects the physical model from control results and corrects progress by repeating control;
- wherein
- control by the feedforward control device is disabled until correction of the physical model is complete.
A control apparatus for a continuously variable transmission which controls gear ratio by using an operating fluid supply and discharge device to change the flow rate of operating fluid, the control apparatus comprising:
- a feedforward control device which uses a physical model to calculate a feedforward manipulated variable to be sent to the operating fluid supply and discharge device;
- a correction device which corrects the physical model from control results and repeats correction of the physical model;
- and
- a feedback control device which calculates a feedback manipulated variable to be sent to the operating fluid supply and discharge device;
- wherein
- control by the feedforward control device is disabled and control by the feedback control device is enabled until correction of the physical model is complete.
A control apparatus for a continuously variable transmission which controls gear ratio by using an operating fluid supply and discharge device to change the flow rate of operating fluid, the control apparatus comprising:
- a feedforward control device which uses a physical model to calculate a feedforward manipulated variable to be sent to the operating fluid supply and discharge device;
- a correction device which corrects the physical model from control results and repeats correction of the physical model;
- a feedback control device which calculates a feedback manipulated variable to be sent to the operating fluid supply and discharge device;
- and
- a weight setting device which specifies weights for feedforward and feedback manipulated variables, wherein the weight for feedforward manipulated variable is increased in accordance with the progress of correction of the physical model.
A control apparatus for a continuously variable transmission which controls gear ratio by using an operating fluid supply and discharge device to change the flow rate of operating fluid, the control apparatus comprising:
- a feedback control device which uses a physical model to calculate a feedback manipulated variable to be sent to the operating fluid supply and discharge device;
- and
- a correction device which corrects the physical model from control results and allows correction to progress by repeating control;
- wherein
- a feedback gain for the feedback control device is changed in accordance with the progress of correction of the physical model.
Dependencies are inferred from the claim text.