Automatic transmission shift quality via selective use of closed-loop pressure feedback control
View Patent ↗A method to control a hydraulically actuated clutch in a transmission of a vehicle includes monitoring a pressure in a hydraulic circuit providing pressurized fluid to the hydraulically actuated clutch with micro-electromechanical pressure sensor, providing a closed-loop feedback control command for a hydraulic control device providing the pressurized fluid to the hydraulic circuit based upon the monitoring pressure, and controlling the control device based upon the closed-loop feedback control command.
1. Method to control a plurality of hydraulically actuated clutches in a transmission, the method comprising:
monitoring a pressure within a first hydraulic circuit providing pressurized fluid to a first hydraulically actuated clutch with a first pressure sensor that is integrated substantially within a wall defining the first hydraulic circuit;
providing a first closed-loop feedback control command for a first hydraulic control device providing the pressurized fluid to the first hydraulic circuit based upon the monitored pressure;
controlling the first hydraulic control device based upon the first closed-loop feedback control command;
monitoring a second pressure within a second hydraulic circuit providing the pressurized fluid to a second hydraulically actuated clutch with a second pressure sensor that is integrated substantially within a wall defining the second hydraulic circuit;
providing a second closed-loop feedback control command for a second hydraulic control device providing the pressurized fluid to the second hydraulic circuit based upon the monitored second pressure; and
controlling the second control device based upon the second closed-loop feedback control command;
wherein controlling the second control device is further based upon the monitored pressure within the first hydraulic circuit.
2. The method of claim 1 , wherein the first pressure sensor comprises a micro-electromechanical pressure sensor.
3. The method of claim 1 , wherein the wall defining the first hydraulic circuit comprises a wall within the first hydraulic control device.
4. The method of claim 1 , wherein the wall defining the first hydraulic circuit comprises a wall proximate the hydraulic control device.
5. The method of claim 1 , wherein the wall defining the first hydraulic circuit comprises a wall defining a clutch control volume of the first hydraulically actuated clutch.
6. The method of claim 1 , wherein the wall defining the first hydraulic circuit comprises a wall defining a hydraulic line proximate to a piston of the first hydraulically actuated clutch.
7. The method of claim 1 , wherein controlling the first hydraulic control device transitions the first clutch from a locked state to an unlocked state.
8. The method of claim 7 , wherein controlling the first hydraulic control device based upon the first closed-loop feedback control command terminates prior to an overall clutch transition period.
9. The method of claim 1 , wherein controlling the first hydraulic control device transitions the first clutch from an unlocked locked state to a locked state.
10. The method of claim 9 , wherein controlling the first hydraulic control device based upon the first closed-loop feedback control command begins subsequent to initiation of a clutch fill event.
11. The method of claim 1 , wherein the second pressure sensor comprises a second micro-electromechanical pressure sensor.