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US 12,644,517 B2Granted
System and method for shifting two speed transmission
AssigneeDana Italia S.R.L.
InventorsGiacomo Faggiani, Pier Paolo Rinaldi, Matteo Cocetti, Sara Gennari
Life of this patent
Estimating the term…
Abstract
Methods and systems for shifting a transmission that includes a dog clutch are described. In one example, the transmission may be coupled to an electric machine and a rotational speed of the electric machine may be adjusted to reduce a speed differential between rotating transmission components. A position of a shifter actuator may be adjusted according to an estimate of when the speed differential is equal to a predetermined value.
Claims13
An electric propulsion system, comprising:
- an electric machine;
- a step gear ratio transmission including at least two gear ratios, the step gear ratio transmission including a shifter actuator;
- and
- one or more controllers including executable instructions that cause the one or more controllers to estimate an amount of time for a differential speed between a rotational speed of an on-coming gear and a rotational speed of a transmission shaft to be less than a threshold rotational speed.
1 more element
An electric propulsion system, comprising:
- an electric machine;
- a step gear ratio transmission including at least two gear ratios, the step gear ratio transmission including a shifter actuator;
- and
- one or more controllers including executable instructions that cause the one or more controllers to estimate an amount of time for a differential speed between a rotational speed of an on-coming gear and a rotational speed of a transmission shaft to be less than a threshold rotational speed, and additional instructions that cause the one or more controllers to adjust a position of the shifter actuator in response to the amount of time for the differential speed between the rotational speed of the on-coming gear and the rotational speed of the transmission shaft being less than the threshold rotational speed.
1 more element
Dependencies are inferred from the claim text.