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US 12,545,228 B2Granted
System and method for shifting a transmission
AssigneeDana Heavy Vehicle Systems Group, LLC
InventorsJames Allen, Jordan M. Houser, Jared Reichert, Darren J. Ziskovsky, Jeffrey M. David
Life of this patent
Estimating the term…
Abstract
A method and system for shifting a transmission that includes one or more mechanical clutches without clutch plates is described. In one example, a torque output of an electric machine is adjusted in response to a request to shift a transmission so that forces that hold the mechanical clutch in an engaged position may be reduced.
Claims16
A method for shifting a transmission, comprising:
- adjusting a torque of an electric machine responsive to a driver demand via a controller while not shifting a gear of the transmission, wherein the electric machine is the only electric machine coupled to the transmission;
- and
- adjusting the torque of the electric machine via the controller responsive to a gear shift request, the torque adjusted according to a torque map that reduces forces that act to keep a clutch engaged to a gear in response to the gear shift request, where the torque map adjusts the torque of the electric machine according to a temperature of the transmission, including:
- at a lower transmission temperature, the torque of the electric machine is temporarily reduced from the torque responsive to the driver demand to a first torque that reduces the forces, and, at a higher temperature, the torque of the electric machine is temporarily reduced from the torque responsive to the driver demand to a second torque, lower than the first torque, that reduces the forces.
1 more element
A propulsion system, comprising:
- an electric machine configured as the only torque source of the propulsion system;
- a transmission including a mechanical clutch configured to selectively engage one or more gears of the transmission;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to adjust a torque of the electric machine to a first mapped torque in response to a request to upshift the transmission to a numerically higher gear, the first mapped torque being a torque that reduces a force acting to hold the mechanical clutch in an engaged position, where the first mapped torque is a function of a transmission temperature and a vehicle speed, and where the first mapped torque decreases as the transmission temperature increases.
1 more element
A method for shifting a transmission, comprising:
- adjusting a torque of an electric machine responsive to a driver demand via a controller while not shifting a mechanical clutch of the transmission, wherein the electric machine is the only electric machine of a powertrain comprising the transmission and the electric machine;
- adjusting the torque of the electric machine via the controller responsive to a first torque map that reduces forces that act to keep a clutch engaged to a first gear in response to a gear upshift request;
- and
- adjusting the torque of the electric machine via the controller responsive to a second torque map that reduces forces that act to keep the clutch engaged to a second gear in response to a gear downshift request, where torque values output from the second torque map are different from torque values output from the first torque map.
1 more element
Dependencies are inferred from the claim text.