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US 11,644,099 B2Granted
Method of shifting a vehicle transmission
AssigneeDana Belgium N.V.
InventorsArnout R. L. De Mare, Jerome Janssens, Mark M. A. Maessen, Keivan Shariatmadar, Mark R. J. Versteyhe, Thomas J. Vyncke
Life of this patent
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Abstract
A method of shifting a vehicle transmission including a first clutching device and a second clutching device is described. At least a portion of the first clutching device is coupled with or configured to be coupled with at least a portion of the second clutching device. The method may include the steps of engaging the second clutching device, where engaging the second clutching device includes controlling a state of the second clutching device by changing a state of the first clutching device. A transmission controller and a vehicle driveline are also described.
Claims20
A method of shifting a vehicle transmission, comprising:
- providing a vehicle transmission including a first clutching device and a second clutching device, wherein at least a portion of the first clutching device is coupled with at least a portion of the second clutching device;
- engaging the second clutching device, wherein engaging the second clutching device includes controlling a state of the second clutching device by changing a state of the first clutching device;
- increasing an engagement pressure of the second clutching device by executing a feedforward control procedure using a feedforward engagement pressure profile for the second clutching device;
- and
- reducing the feedforward engagement pressure profile for the second clutching device by a mean dynamic pressure accounting for a dynamic pressure building up in the second clutching device due to a rotation of a clutch shaft of the second clutching device, and the mean dynamic pressure building up in the second clutching device based on at least one of:
- an angular speed of the clutch shaft,
- a local radius of a clutch piston of the second clutching device,
- an inner radius of the clutch piston,
- an outer radius of the clutch piston,
- a radius of a pipe in fluid communication with the clutch piston, and
- a density of a lubricant inside a clutch chamber of the second clutching device.
8 more elements
A method of shifting a vehicle transmission, comprising:
- engaging a second clutching device of the vehicle transmission and controlling a state of the second clutching device by changing a state of a first clutching device of the vehicle transmission, wherein at least a portion of the first clutching device is coupled with at least a portion of the second clutching device;
- determining a first torque transmission direction between a power source coupled to the transmission and the transmission, wherein the first torque transmission direction is one of (i) torque transmission towards the power source and (ii) torque transmission towards a vehicle output;
- determining a second torque transmission direction between an input and an output of the second clutching device based on a current state of the second clutching device, wherein the input of the second clutching device is coupled or selectively coupled with the power source and wherein the output of the second clutching device is drivingly engaged with or selectively drivingly engaged with the vehicle output, wherein the second torque transmission direction is one of (i) torque transmission towards the power source and (ii) torque transmission towards the vehicle output;
- comparing the first torque transmission direction and the second torque transmission direction;
- and
- controlling the state of the second clutching device based on the outcome of the comparison.
3 more elements
A method of shifting a vehicle transmission, comprising:
- engaging a second clutching device of the vehicle transmission and controlling a state of the second clutching device by changing a state of a first clutching device of the vehicle transmission, wherein at least a portion of the first clutching device is coupled with at least a portion of the second clutching device;
- decreasing an engagement pressure of the first clutching device by executing at least one of:
- a feedback control procedure using a slip speed of the first clutching device as a process variable and using the engagement pressure of the first clutching device as a control variable, and
- a feedforward control procedure using a feedforward engagement pressure profile for the first clutching device;
- and
- reducing the feedforward engagement pressure profile for the first clutching device by a mean dynamic pressure accounting for a dynamic pressure building up in the first clutching device due to a rotation of a clutch shaft of the first clutching device, wherein the mean dynamic pressure building up in the first clutching device is computed based on at least one of:
- an angular speed of the clutch shaft,
- a local radius of a clutch piston of the first clutching device,
- an inner radius of the clutch piston,
- an outer radius of the clutch piston,
- a radius of a pipe in fluid communication with the clutch piston, and
- a density of a lubricant inside a clutch chamber of the first clutching device.
9 more elements
Dependencies are inferred from the claim text.