Engine control systems and methods for accelerator pedal tip-out
AssigneeGM Global Technology Operations LLC
InventorsBret J. Keller, Krishnendu Kar
Life of this patent
Estimating the term…
Abstract
A difference module determines a difference between an engine speed and a transmission input shaft speed. A state control module sets a signal to a first state when a driver releases an accelerator pedal and selectively transitions the signal from the first state to a second state when the difference is less than zero. An immediate torque request module decreases an engine torque request when the signal is in the first state and selectively increases the engine torque request when the signal is in the second state. At least one of: a spark control module that selectively adjusts spark timing based on the engine torque request; and a fuel control module that selectively adjusts fueling based on the engine torque request.
Claims20
An engine control system of a vehicle, comprising:
- a difference module that determines a difference between an engine speed and a transmission input shaft speed;
- a state control module that sets a signal to a first state when a driver releases an accelerator pedal and that selectively transitions the signal from the first state to a second state when the difference is less than zero;
- an immediate torque request module that decreases an engine torque request when the signal is in the first state and that selectively increases the engine torque request when the signal is in the second state;
- and
- at least one of:
- a spark control module that selectively adjusts spark timing based on the engine torque request;
- and
- a fuel control module that selectively adjusts fueling based on the engine torque request.
An engine control method for a vehicle, comprising:
- determining a difference between an engine speed and a transmission input shaft speed;
- setting a signal to a first state when a driver releases an accelerator pedal;
- selectively transitioning the signal from the first state to a second state when the difference is less than zero;
- decreasing an engine torque request when the signal is in the first state;
- selectively increasing the engine torque request when the signal is in the second state;
- and
- at least one of:
- selectively adjusting spark timing based on the engine torque request;
- and
- selectively adjusting fueling based on the engine torque request.
Dependencies are inferred from the claim text.