Powertrain control method for minimizing effects of engine torque disturbances
First Claim
1. A method for controlling output of a vehicle powertrain having an engine and a torque transmitting unit with multiple transmission paths including multiple clutches, the vehicle also having a electronic control unit, the method comprising:
- operating the torque transmitting unit to have a preselected gear ratio;
providing an indication of an engine output disturbance;
in response to said indication, transmitting torque through said torque transmitting unit via at least two paths, and adjusting a clutch parameter of at least one of the clutches of said torque transmitting unit; and
after said engine output disturbance ends, operating the torque transmitting unit to have said preselected gear ratio.
3 Assignments
0 Petitions
Accused Products
Abstract
A system is described for minimizing engine torque disturbances that would otherwise cause degraded drive feel by a vehicle driver. The system utilizes multiple torque transmission paths of a transaxle unit mounted to the engine. The system manipulates the torque transmitted by adjusting the clutches of multiple torque transmission paths so that the torque disturbance in the engine results in relatively constant vehicle drive torque. In one example, a potential torque increase due to a change in engine air-fuel ratio is minimized by transmitted torque through multiple transmission paths.
-
Citations
21 Claims
-
1. A method for controlling output of a vehicle powertrain having an engine and a torque transmitting unit with multiple transmission paths including multiple clutches, the vehicle also having a electronic control unit, the method comprising:
-
operating the torque transmitting unit to have a preselected gear ratio;
providing an indication of an engine output disturbance;
in response to said indication, transmitting torque through said torque transmitting unit via at least two paths, and adjusting a clutch parameter of at least one of the clutches of said torque transmitting unit; and
after said engine output disturbance ends, operating the torque transmitting unit to have said preselected gear ratio.
-
-
2. A method for controlling output of a vehicle powertrain having an engine and a torque transmitting unit with multiple transmission paths including multiple clutches, the vehicle also having a electronic control unit, the method comprising:
-
providing an indication of an engine output disturbance;
in response to said indication, applying at least two clutches of said torque transmitting unit; and
adjusting a clutch parameter of at least one of said at least two clutches based on an estimate of said engine output disturbance. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A system for a passenger vehicle, comprising:
-
an engine;
a torque transmitting unit having at least a first and second torque transmission path coupled to said engine, with said at least two torque transmission paths having a clutch that affects torque of said respective path; and
a control unit for providing an indication of an engine torque output disturbance, applying at least two clutches, with a first clutch being applied before said indication and a second clutch being applied in response to said indication, and adjusting a clutch parameter of at least one of the first and second clutches based on said engine torque output disturbance so that a vehicle drive torque is substantially unaffected by said torque disturbance. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
Specification