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US 12,747,777 B2Granted
System and method for detecting relative angular positions of dog clutch elements
AssigneeDana Italia S.R.L.
InventorsGiacomo Faggiani, Pier Paolo Rinaldi, Mark Slater, Richard Taylor
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Abstract
Methods and systems for shifting a multi-gear step ratio transmission that includes a dog clutch are described. In one example, rotational positions of different transmission components are measured by tone wheels and a shifter actuator position is adjusted in response to a phase angle difference between the rotational positions of the different transmission components.
Claims10
An electric propulsion system, comprising:
- an electric machine;
- a step gear ratio transmission including three tone wheels and three tone wheel position sensors, the step gear ratio transmission including a shifter actuator;
- and
- one or more controllers including executable instructions stored in memory that cause the one or more controllers to command the shifter actuator to engage a dog clutch in response to a phase angle between two tone wheel angles of the three tone wheels being less than or equal to a minimum phase angle plus an angular backlash amount or greater than or equal to the minimum phase angle minus the angular backlash amount, where the minimum phase angle is a phase angle between the two tone wheel angles at which the dog clutch is engaged, and where the angular backlash amount is an angular amount corresponding to clearance between teeth of a first half of the dog clutch and cavities of a second half of the dog clutch.
1 more element
An electric propulsion system, comprising:
- an electric machine;
- a step gear ratio transmission including three tone wheels and three tone wheel position sensors, the step gear ratio transmission including a shifter actuator;
- and
- one or more controllers including executable instructions stored in memory that cause the one or more controllers to adjust a position of the shifter actuator in response to a phase angle between two tone wheel angles of the three tone wheels plus an offset angle, wherein the offset angle is an offset of the phase angle between the two tone wheel angles of the three tone wheels, wherein the offset angle is determined by an amount of time for the shifter actuator to move from its present position to an engaged position, wherein the engaged position is a position of the shifter actuator at which a dog clutch of the step gear ration transmission engages a gear.
1 more element
Dependencies are inferred from the claim text.