Torsional isolation of a convertless automatic transmission through slip control of friction clutch
First Claim
1. A method for controlling operation of a hydraulically-actuated input clutch in an automotive vehicle driveline that includes an internal combustion engine for transmitting input torque to the clutch and having a throttle that is controlled by a displaceable accelerator pedal, and a transmission for producing multiple gear ratios between the clutch and an output, the clutch having a variable torque capacity, slip and clutch pressure, the method comprising the steps of:
- determining the current magnitude of input torque transmitted to the clutch by the engine;
monitoring slip speed at the input clutch;
determining a magnitude of clutch pressure that would produce a torque capacity of the input clutch equal to the current magnitude of input torque;
monitoring the position of the accelerator pedal to determine whether a transient condition occurs;
if no transient condition occurs, pressurizing the clutch at a magnitude of pressure that produces a predetermined slip of the input clutch at the current magnitude of input torque; and
if a transient condition occurs, reducing said determined magnitude of input clutch pressure to by a predetermined magnitude such that slip occurs at the input clutch.
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0 Petitions
Accused Products
Abstract
An automotive vehicle driveline includes an internal combustion engine for transmitting input torque to a hydraulically-actuated input clutch, and having a throttle controlled by a displaceable accelerator pedal. A transmission produces multiple gear ratios between the clutch and an output. A method for controlling operation of the clutch includes determining a magnitude of clutch pressure that would produce a torque capacity of the input clutch equal to the current magnitude of input torque; if no transient condition occurs, pressurizing the clutch at a magnitude of pressure that produces a predetermined slip of the input clutch at the current magnitude of input torque; and if a transient condition occurs, holding and/or reducing the determined input clutch pressure such that slip occurs at the input clutch.
27 Citations
18 Claims
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1. A method for controlling operation of a hydraulically-actuated input clutch in an automotive vehicle driveline that includes an internal combustion engine for transmitting input torque to the clutch and having a throttle that is controlled by a displaceable accelerator pedal, and a transmission for producing multiple gear ratios between the clutch and an output, the clutch having a variable torque capacity, slip and clutch pressure, the method comprising the steps of:
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determining the current magnitude of input torque transmitted to the clutch by the engine;
monitoring slip speed at the input clutch;
determining a magnitude of clutch pressure that would produce a torque capacity of the input clutch equal to the current magnitude of input torque;
monitoring the position of the accelerator pedal to determine whether a transient condition occurs;
if no transient condition occurs, pressurizing the clutch at a magnitude of pressure that produces a predetermined slip of the input clutch at the current magnitude of input torque; and
if a transient condition occurs, reducing said determined magnitude of input clutch pressure to by a predetermined magnitude such that slip occurs at the input clutch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for controlling operation of a hydraulically-actuated input clutch in an automotive vehicle driveline, the clutch having a variable torque capacity, slip and clutch pressure, the system comprising:
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an internal combustion engine transmitting input torque to the clutch and having a throttle for controlling torque produced by the engine;
a displaceable accelerator pedal for controlling the engine throttle;
a displaceable accelerator pedal;
a transmission for producing multiple gear ratios between the clutch and an output;
a controller including a closed-loop control and an open-loop control, the controller determining the current magnitude of input torque transmitted to the clutch by the engine;
monitoring slip speed at the input clutch;
determining a magnitude of clutch pressure that would produce a torque capacity of the input clutch equal to the current magnitude of input torque;
monitoring the position of the accelerator pedal to determine whether a transient condition occurs;
if no transient condition occurs, using the closed-loop control to pressurize the clutch at a magnitude of pressure that produces a predetermined slip of the input clutch at the current magnitude of input torque; and
if a transient condition occurs, using the open-loop control to reduce said determined magnitude of input clutch pressure by a predetermined magnitude such that slip occurs at the input clutch. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification