Adaptive control method for an automatic transmission
First Claim
1. A method for filling clutches with fluid, in a vehicle having an engine, a transmission, and a torque convertor for transmitting torque between the engine and transmission, the transmission comprising:
- a plurality of speed changing clutches;
a plurality of direction changing clutches;
a plurality of pressure control valves individually connected to the clutches;
a hydraulic pump adapted to deliver pressurized hydraulic oil to the plurality of pressure control valves, predetermined ones of the pressure control valves metering hydraulic fluid to the clutches in response to receiving a clutch command signal in accordance with a method comprising the steps of;
commanding a pressure control valve of a predetermined clutch for a predetermined time period in order to fill the predetermined clutch in accordance with a plurality of clutch fill parameters;
determining the actual time to substantially fill the clutch, the actual time being indicative of a clutch fill period;
comparing the actual fill time with a predetermined fill time; and
adjusting at least one of the plurality of clutch fill parameters in response to the comparison in order to modify the clutch fill period during subsequent shifts to the predetermined clutch.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention relates to an adaptive control method for an automatic transmission. The method includes the steps of:
(a) commanding a predetermined clutch to fill in accordance with a plurality of clutch fill parameters;
(b) determining the actual time to completely fill the clutch;
(c) comparing the actual fill time with a predetermined fill time; and
(d) adjusting at least one of the plurality of clutch fill parameters in response to the comparison in order to modify the clutch fill period during subsequent shifts to the predetermined clutch. Accordingly, the present invention adapts future shifts based on past shifts to improve the shift quality of the transmission.
121 Citations
17 Claims
-
1. A method for filling clutches with fluid, in a vehicle having an engine, a transmission, and a torque convertor for transmitting torque between the engine and transmission, the transmission comprising:
-
a plurality of speed changing clutches; a plurality of direction changing clutches; a plurality of pressure control valves individually connected to the clutches; a hydraulic pump adapted to deliver pressurized hydraulic oil to the plurality of pressure control valves, predetermined ones of the pressure control valves metering hydraulic fluid to the clutches in response to receiving a clutch command signal in accordance with a method comprising the steps of; commanding a pressure control valve of a predetermined clutch for a predetermined time period in order to fill the predetermined clutch in accordance with a plurality of clutch fill parameters; determining the actual time to substantially fill the clutch, the actual time being indicative of a clutch fill period; comparing the actual fill time with a predetermined fill time; and adjusting at least one of the plurality of clutch fill parameters in response to the comparison in order to modify the clutch fill period during subsequent shifts to the predetermined clutch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
Specification