System and method for controlling engine stop-start events
AssigneeAllison Transmission, Inc.
InventorsClaire Etchason, Jacob Hoeschen, Charles F. Long
Life of this patent
Estimating the term…
Abstract
Systems and methods are provided for controlling a transmission. An engine stop-start event may be allowed or denied based on one or more characteristics of the vehicle including the transmission.
Claims19
A transmission of a powertrain of a vehicle, the powertrain including an engine and an engine stop-start arbitration controller, the transmission comprising:
- a gear and selective coupler arrangement;
- a main hydraulic pump operatively coupled to the gear and selective coupler arrangement;
- an auxiliary pump operatively coupled to the gear and selective coupler arrangement;
- and
- a transmission control circuit operatively coupled to the main pump and the auxiliary pump, the transmission control circuit configured to:
- determine one or more grades of the vehicle at a first location;
- determine one or more auxiliary pump speeds of an auxiliary pump of the transmission for an engine stop-start event based on the determined one or more grades of the vehicle at the first location;
- determine that one or more of the determined one or more auxiliary pump speeds exceed a threshold allowable speed;
- and
- based on the one of the one or more determined auxiliary pump speeds exceeding the threshold allowable speed, communicate an engine stop-start deny communication to an engine stop-start arbitration controller of the vehicle.
A method of controlling a transmission during an engine stop-start event of an engine of a powertrain of a vehicle, the method comprising:
- determining one or more grades of the vehicle at a first location;
- determining one or more auxiliary pump speeds of an auxiliary pump of the transmission for an engine stop-start event based on the determined one or more grades of the vehicle at the first location;
- determining one or more of the determined one or more auxiliary pump speeds exceed a threshold allowable speed;
- and
- based on the one of the one or more determined auxiliary pump speeds exceeding the threshold allowable speed, communicating an engine stop-start deny communication to an engine stop-start arbitration controller of the vehicle.
A method of controlling a transmission during an engine stop-start event of an engine of a powertrain of a vehicle, the method comprising:
- determining one or more grades of the vehicle at a first location;
- adding a grade settling error to the determined one or more grades of the vehicle;
- determining one or more auxiliary pump speeds of an auxiliary pump of the transmission for an engine stop-start event based on the determined one or more grades of the vehicle at the first location;
- while the vehicle is at the first location, holding a gear and selective coupler arrangement in a first configuration with the auxiliary pump of the transmission;
- and
- subsequently, while the vehicle is traveling, configuring the gear and selective coupler arrangement with a main pump of the transmission.
Dependencies are inferred from the claim text.