Method for effecting kickdown shift
AssigneeChrysler Corporation
InventorsGang Chen, Aaron Pfadt
Life of this patent
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Abstract
A method for effecting a kickdown shift in a transmission of an automotive vehicle controls turbine speed change based on a continuous desired acceleration calculation. The method determines an initial speed of a turbine that transmits torque between an engine and a plurality of gears through a plurality of releasing and engaging elements. A target speed of one of the plurality of gears is determined. A desired time required to increase the turbine speed to the target speed is determined. A desired acceleration of the turbine is calculated according to the initial speed, the target speed, and the desired time. Turbine speed change rate is controlled through controlling the clutch torque of one or more of the releasing and engaging elements based on the desired acceleration.
Claims18
A method for effecting a kickdown shift in a transmission of an automotive vehicle, the transmission including a plurality of gears and a torque converter assembly and turbine for transmitting torque between an engine and the plurality of gears through a plurality of engaging and releasing elements, the method comprising:
- determining an initial speed of the turbine;
- determining a target speed of one of the plurality of gears;
- determining a desired time required to increase the initial speed to the target speed;
- calculating a desired acceleration of the turbine according to the initial speed, the target speed, and the desired time;
- and
- controlling the torque of one or more releasing and engaging elements based on the desired acceleration.
A method for effecting a kickdown shift in a transmission of an automotive vehicle, the transmission including a plurality of gears and a torque converter assembly having a turbine for transmitting torque between an engine and the plurality of gears through a plurality of releasing and engagement elements, the method comprising:
- determining a shift event based on vehicle speed and one of a throttle position and engine output torque;
- determining an initial speed of the turbine;
- determining a target speed of one of the plurality of gears according to the shift event;
- determining a desired time required to increase the initial speed to the target speed;
- calculating a desired acceleration of the turbine according to the initial speed, the target speed, and the desired time;
- and
- controlling torque of one or more releasing and engaging elements based on the desired acceleration.
A system for effecting a kickdown shift in a transmission of an automotive vehicle, the transmission including a plurality of gears and a torque converter assembly and turbine for transmitting torque between an engine and the plurality of gears through a plurality of releasing and engagement elements, the system comprising:
- a transmission controller adapted to be coupled to the transmission;
- a turbine speed sensor transmitting a signal indicative of turbine speed to the transmission controller;
- and
- a transmission output speed sensor transmitting a signal indicative of transmission output speed to the transmission controller;
- wherein the transmission controller is operative:
- to determine, using the speed sensors, an initial speed of the turbine, a target speed of one of the plurality of gears, and a desired time required to increase the initial speed to the target speed;
- to calculate a desired acceleration of the turbine as a function of the initial speed, the target speed and the desired time;
- and
- to control turbine speed change rate based on the desired acceleration through controlling the torque of one or more releasing and engaging elements.
A vehicle comprising:
- an engine;
- a transmission including a plurality of gears;
- a torque converter assembly having a turbine for transmitting torque between the engine and the plurality of gears via a plurality of releasing and engaging elements;
- and
- a transmission controller coupled to the transmission and the engine, wherein the transmission controller is operative to:
- determine an initial speed of the turbine;
- determine a target speed of one of the plurality of gears;
- determine a desired time required to increase the initial speed to the target speed;
- calculate a desired acceleration of the turbine as a function of the initial speed, the target speed and the desired time;
- and
- control turbine speed change rate through controlling torque of one or more releasing and engaging elements based on the desired acceleration.
Dependencies are inferred from the claim text.