System and method for improving vehicle performance
First Claim
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1. An engine system for a vehicle, comprising:
- an engine including an actuator; and
a controller operatively coupled to the engine and the actuator, the controller including instructions stored in non-transitory memory to transform a signal from an accelerator pedal into a driver demand torque via a transfer function stored in a table, and further instructions to adjust values of the transfer function stored in the table during vehicle acceleration in response to a difference between a desired vehicle acceleration and an actual vehicle acceleration, and further instructions to apply the adjusted values of the transfer function stored in the table in response to the accelerator pedal being in a base position including delaying application of the adjusted values until after a throttle tip-out, and to adjust the actuator to vary engine torque based on the adjusted values of the transfer function.
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Abstract
Methods and systems for adjusting vehicle operation in response to vehicle weight are described. In one example, an adaptive driver demand correction is adjusted in response to vehicle weight. The methods and systems may provide for more consistent powertrain response and lower vehicle emissions at lower vehicle weights.
65 Citations
16 Claims
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1. An engine system for a vehicle, comprising:
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an engine including an actuator; and a controller operatively coupled to the engine and the actuator, the controller including instructions stored in non-transitory memory to transform a signal from an accelerator pedal into a driver demand torque via a transfer function stored in a table, and further instructions to adjust values of the transfer function stored in the table during vehicle acceleration in response to a difference between a desired vehicle acceleration and an actual vehicle acceleration, and further instructions to apply the adjusted values of the transfer function stored in the table in response to the accelerator pedal being in a base position including delaying application of the adjusted values until after a throttle tip-out, and to adjust the actuator to vary engine torque based on the adjusted values of the transfer function. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An engine system of a vehicle, comprising:
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an engine including a plurality of actuators; and a controller operatively coupled to the engine and the plurality of actuators, the controller including instructions stored in non-transitory memory to transform a signal from a driver input device into a driver demand torque, the driver demand torque based on a transfer function stored in a table, and additional instructions to determine a plurality of parameters that adjust at least one of the plurality of actuators in response to a difference between a desired vehicle acceleration and an actual vehicle acceleration being greater than a threshold and an underperformance adaptive driver demand correction being within predetermined limits, the underperformance adaptive driver demand correction based on the difference between the desired vehicle acceleration and the actual vehicle acceleration multiplied by a predetermined factor, and additional instructions to adjust at least one of the plurality of actuators via the controller to vary engine torque when the underperformance adaptive driver demand correction is within the predetermined limits, and additional instructions to adjust values of the transfer function during vehicle acceleration and to apply the adjusted values of the transfer function in response to the driver input device being in a base position including delaying application of the adjusted values of the transfer function until after a throttle tip-out, and where applying the adjusted values includes determining the driver demand torque via the adjusted values. - View Dependent Claims (9)
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10. An engine system, comprising:
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an engine including an actuator; a turbocharger coupled to the engine; and a controller operatively coupled to the engine and the turbocharger, the controller including instructions stored in a non-transitory medium to adjust a driver input variable via adding an adaptive driver demand correction to the driver input variable, the adaptive driver demand correction adjusted in response to an absolute value of a desired vehicle acceleration minus an actual vehicle acceleration not being less than a threshold, and further instructions to adjust the actuator via the controller responsive to the adjusted driver input variable, the adaptive driver demand correction including values of a transfer function adapted during vehicle acceleration, the values of the transfer function applied in response to a driver input device being in a base position including delaying application of the adjusted values until after a throttle tip-out. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification