Curve-dependent engine drag-torque control
First Claim
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1. An engine drag-torque controller for a motor vehicle comprising:
- a detecting arrangement for detecting curves and coefficients of friction; and
an arrangement for increasing the torque of an engine when at least one driven wheel falls below a slip threshold due to a braking action of the engine, the arrangement increasing the slip threshold for at least one driven wheel in response to cornering on a roadway having a low coefficient of friction;
wherein, in response to wheel slip because of a downshift operation, the engine torque is increased by a boosted augmenting torque which is greater than an augmenting torque in response to releasing an accelerator.
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Abstract
An engine drag-torque control, particularly for motor vehicles, in which the engine torque is increased by an EDC augmenting torque when the driven wheels drop below a slip threshold due to the braking action of the engine and exhibit a brake slip which is too high. To improve the vehicle control during cornering on a roadway having a low coefficient of friction, it is provided to increase the slip threshold for the driven wheels to thereby set the drag-torque control to be more sensitive.
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Citations
18 Claims
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1. An engine drag-torque controller for a motor vehicle comprising:
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a detecting arrangement for detecting curves and coefficients of friction; and
an arrangement for increasing the torque of an engine when at least one driven wheel falls below a slip threshold due to a braking action of the engine, the arrangement increasing the slip threshold for at least one driven wheel in response to cornering on a roadway having a low coefficient of friction;
wherein, in response to wheel slip because of a downshift operation, the engine torque is increased by a boosted augmenting torque which is greater than an augmenting torque in response to releasing an accelerator. - View Dependent Claims (2)
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3. An engine drag-torque controller for a motor vehicle comprising:
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a detecting arrangement for detecting curves and coefficients of friction; and
an arrangement for increasing the torque of an engine when at least one driven wheel falls below a slip threshold due to a braking action of the engine, the arrangement increasing the slip threshold for at least one driven wheel in response to cornering on a roadway having a low coefficient of friction;
wherein, in response to wheel slip because of a downshift operation, an amplified rotary acceleration moment of resistance is calculated. - View Dependent Claims (4)
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5. An engine drag-torque controller for a motor vehicle comprising:
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a detecting arrangement for detecting curves and coefficients of friction; and
an arrangement for increasing the torque of an engine when at least one driven wheel falls below a slip threshold due to a braking action of the engine, the arrangement increasing the slip threshold for at least one driven wheel in response to cornering on a roadway having a low coefficient of friction;
wherein the engine torque is increased by at least a minimum augmenting torque.
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6. An engine drag-torque controller for a motor vehicle comprising:
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a detecting arrangement for detecting curves and coefficients of friction; and
an arrangement for increasing the torque of an engine when at least one driven wheel falls below a slip threshold due to a braking action of the engine, the arrangement increasing the slip threshold for at least one driven wheel in response to cornering on a roadway having a low coefficient of friction;
wherein, after the driven wheel has exceeded the slip threshold again, the arrangement continues an engine-drag torque control for a predefined follow-up time, and during the follow-up time, a follow-up augmenting torque is generated.
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7. A method for engine drag-torque control for a motor vehicle, the engine torque being increased when at least one driven wheel drops below a slip threshold due to a braking action of the engine and exhibits a brake slip which is too high, the method comprising:
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determining whether the vehicle is cornering;
ascertaining a coefficient of friction of a roadway;
raising the slip threshold for at least one driven wheel if cornering was detected on a roadway having a low coefficient of friction; and
calculating a boosted augmenting torque in response to wheel slip because of a downshift operation. - View Dependent Claims (8, 9)
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10. A method for engine drag-torque control for a motor vehicle, the engine torque being increased when at least one driven wheel drops below a slip threshold due to a braking action of the engine and exhibits a brake slip which is too high, the method comprising:
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determining whether the vehicle is cornering;
ascertaining a coefficient of friction of a roadway;
raising the slip threshold for at least one driven wheel if cornering was detected on a roadway having a low coefficient of friction;
continuing an engine drag-torque control for a predefined follow-up time after the slip threshold has been exceeded; and
predefining a follow-up augmenting torque during the follow-up time.
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11. A method for engine drag-torque control for a motor vehicle, the engine torque being increased when at least one driven wheel drops below a slip threshold due to a braking action of the engine and exhibits a brake slip which is too high, the method comprising:
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determining whether the vehicle is cornering;
ascertaining a coefficient of friction of a roadway;
raising the slip threshold for at least one driven wheel if cornering was detected on a roadway having a low coefficient of friction;
continuing an engine drag-torque control for a predefined follow-up time after the slip threshold has been exceeded; and
predefining a follow-up augmenting torque during the follow-up time wherein the engine torque is increased by at least a minimum augmenting torque.
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12. An engine drag-torque controller for a motor vehicle comprising:
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a detecting arrangement for detecting curves and coefficients of friction; and
an arrangement for increasing the torque of an engine when at least one driven wheel falls below a slip threshold due to a braking action of the engine, the arrangement increasing the slip threshold for at least one driven wheel in response to cornering on a roadway having a low coefficient of friction;
wherein;
in response to wheel slip because of a downshift operation, the engine torque is increased by a boosted augmenting torque which is greater than an augmenting torque in response to releasing an accelerator, and in response to wheel slip because of a downshift operation, amplified rotary acceleration moment of resistance is calculated. - View Dependent Claims (13, 14, 15, 16, 17, 18)
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Specification