System and method for clutch heating control
A method and system for estimating a temperature of a clutch and a maximum temperature of a clutch are described. In one example, the maximum temperature of the clutch is based on phases of a transmission gear shift. The transmission gear shift may include a power-on downshift and a power-on upshift.
1 . A method for operating a clutch, comprising:
via a controller, generating an estimate of a temperature of the clutch;
generating a threshold pressure for the clutch based on phases of a gear shift, wherein the threshold pressure is a maximum clutch pressure; and
adjusting operation of a device in response to the threshold pressure.
2 . The method of claim 1 , where the device is a torque source and where torque output of the torque source is adjusted.
3 . The method of claim 1 , where the device is the clutch and where pressure within the clutch is reduced.
4 . The method of claim 1 , where the estimate of the temperature of the clutch is based on a torque capacity of the clutch, and further comprising adjusting operation of the device in further response to the temperature of the clutch.
5 . The method of claim 4 , where the estimate of the temperature of the clutch is further based on a rotational speed of the clutch.
6 . The method of claim 5 , where the estimate of the temperature of the clutch is further based on integrating a heat power of the clutch.
7 . The method of claim 6 , where generating the threshold pressure is further based on a form factor of a clutch profile.
8 . A vehicle system, comprising:
one or more torque sources;
a transmission including a plurality of gear clutches and gears;
a controller including executable instructions that cause the controller to:
adjust a pressure supplied to the one of the plurality of gear clutches in response to a temperature estimate of the one of the plurality of gear clutches and a threshold temperature for the one of the plurality of gear clutches, where the threshold temperature is based on phases of a gear shift; and
determine phases of a scheduled gear shift.
9 . The vehicle system of claim 8 , further comprising generating a threshold pressure based on a form factor for a clutch profile.
10 . The vehicle system of claim 8 , further comprising adjusting torque output of the one or more torque sources in response to a pressure change of the one of the plurality of gear clutches.
11 . The vehicle system of claim 8 , where the phases of the gear shift include a pre-sync/slipsign phase and an overlap off phase.
12 . The vehicle system of claim 8 , where the phases of the gear shift include an overlap on phase and a sync phase.
13 . The vehicle system of claim 2 , where the scheduled gear shift is an upshift or a downshift.
14 . A method for operating a clutch, comprising:
via a controller, integrating a variable over phases of a gear shift to generate a threshold temperature for the clutch; and
adjusting operation of a device in response to a temperature of the clutch and the threshold temperature for the clutch.
15 . The method of claim 14 , where the variable is heat power of the clutch.
16 . The method of claim 15 , where the heat power is based on a torque capacity of the clutch.
17 . The method of claim 15 , where the heat power is further based on a rotational speed of the clutch.
18 . The method of claim 14 , where the device is the clutch.