US 2001/0039939 A1 · Apparatus for learning full-closed position of accelerator pedal and method of the same

Abstract

The technique of the present invention enables a full closed position of an accelerator pedal to be learnt with a high accuracy. More specifically the arrangement of the invention effectively prevents the full closed position of the accelerator pedal from being mistakenly learnt and quickly changes a current full closed position of the accelerator pedal to a new, more appropriate full closed position. In a system of the present invention, a master controller updates a full-closed position accelerator opening θclosed when an accelerator open flag Fopen is set ON and when a current accelerator opening θn is less than a learning permission accelerator opening θlok and monotonously decreases to be converged. The master controller sets the converged accelerator opening θn to a new full-closed position accelerator opening θclosed when the converged accelerator opening θn is greater than a current full-closed position accelerator opening θclosed. The master controller sets a remainder obtained by subtracting a predetermined value from the current full-closed position accelerator opening θclosed to the new full-closed position accelerator opening θclosed when the converged accelerator opening θn is not greater than the current full-closed position accelerator opening θclosed.

Claims30

Dependent claims

A method of learning a full-closed position output value at a full closed position of an accelerator pedal disposed in a vehicle, the accelerator pedal enabling a required output value to be output to a driving power source of the vehicle in a continuously variable manner and having the full closed position that corresponds to a required output value of 0, the method comprising:

determining whether an output value of the accelerator pedal has exceeded a first threshold value;
determining whether the output value of the accelerator pedal is less than a second threshold value, which is smaller than the first threshold value, after the output value of the accelerator pedal has exceeded the first threshold value;
when it is determined that the output value of the accelerator pedal is less than the second threshold value, determining whether the output value of the accelerator pedal is converging;
and
when it is determined that the output value of the accelerator pedal is converging, changing the full-closed position output value with taking into account the converged output value of the accelerator pedal.

2 more elements

A method of successively updating a full-closed position output value of an accelerator pedal at a full closed position corresponding to a specific state in which an operating quantity of the accelerator pedal is equal to zero, the method comprising:

determining whether an output value of the accelerator pedal is less than a threshold value;
when it is determined that the output value of the accelerator pedal is less than the threshold value, determining whether the output value of the accelerator pedal is converging;
when it is determined that the output value of the accelerator pedal is converging, comparing a current full-closed position output value of the accelerator pedal with the converged output value of the accelerator pedal;
when the current full-closed position output value of the accelerator pedal is greater than the converged output value of the accelerator pedal, setting a mean of the current full-closed position output value of the accelerator pedal and the converged output value of the accelerator pedal to a new full-closed position output value of the accelerator pedal;
and
when the current full-closed position output value of the accelerator pedal is not greater than the converged output value of the accelerator pedal, setting the converged output value of the accelerator pedal to the new full-closed position output value of the accelerator pedal.

3 more elements

A full-closed position learning apparatus that learns a full closed position of an accelerator pedal in a released state, the full-closed position learning apparatus comprising:

an accelerator depression measurement unit that measures a depression amount of the accelerator pedal as an operational opening;
a first storage unit that registers therein an accelerator open record when the observed operational opening exceeds an open record reference value;
a learning permission decision unit that determines whether the observed operational opening is less than a learning permission reference value, which is smaller than the open record reference value;
an opening convergence decision unit that determines whether the operational opening is converging when it is determined that the observed operational opening is less than the learning permission reference value while the accelerator open record is present in the first storage unit;
and
a full-closed position opening variation unit that varies the operational opening at the full closed position to a new full-closed position operational opening by taking into account the converged operational opening, when it is determined that the operational opening is converging.

3 more elements

Dependencies are inferred from the claim text.

Apparatus for learning full-closed position of accelerator pedal and method of the same

Life of this patent

Apparatus for learning full-closed position of accelerator pedal and method of the same

Life of this patent

Abstract

Claims30