Process for the transition correction of the mixture control of

Details Process for the transition correction of the mixture control of Process for the transition correction of the mixture control of

1992-10-22

1993-11-16

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Fuel injection system

123493, F02D 4110, F02D 4112

Patent

active

052613771

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention concerns a transition correction of the mixture control of an internal combustion engine during dynamic transition states.
Such a process is, for example, described in U.S. Pat. No. 4,359,993.
In this, the throttle valve position, the rotational speed and the induction pipe pressure are recorded by means of appropriate sensors for acceleration enrichment or deceleration weakening. Taking account of the change to the throttle valve position is intended to ensure a rapid correction of the fuel quantity to be injected during transition. Additionally taking account of the change to the measured induction pipe pressure is intended, by means of a slower correction, to compensate for wall film effects.


SUMMARY OF THE INVENTION

The object of the present invention consists, in contrast, in taking even better account of changes to induction pipe pressure in the dynamic transition state so that it is possible to carry out a rapid correction corresponding to the change in induction pipe pressure.
The solution according to the invention is a process for the transition correction of the mixture control of an internal combustion engine during dynamic transition states. At least the throttle valve position, the rotational speed and the induction pipe pressure are recorded. For the transition correction, a correction factor influencing the fuel quantity to be injected is formed as a function of the measured induction pipe pressure or an induction pipe pressure change which has been determined. For the determination of the induction pipe pressure change, a characteristic field is used which contains induction pipe pressure values dependent on the throttle valve position and the rotational speed. The induction pipe pressure change is the numerically largest value of the difference values from the two last sequentially determined induction pipe pressure values and the difference between an induction pipe pressure value previously measured and the induction pipe pressure value last measured.
advantageous developments of the present invention are as follows.
A corrected induction pipe pressure change is the largest of three change values which have been determined. The first change value is the difference between the current induction pipe pressure and the last recorded measurement of induction pipe pressure. The second change value is the difference between the current induction pipe pressure and a second-last recorded induction pipe pressure. The third change value is the induction pipe pressure change determinedly by means of the characteristic field. The process is started when the corrected induction pipe pressure change exceeds a certain limiting value. The induction pipe pressure values in the characteristic field are selected in such a way that the resulting induction pipe pressure change during a constant acceleration or deceleration is always less than the first change value.
The processes for an acceleration enrichment and a deceleration weakening are carried out in the same way.
The transition correction is ended after x further calculations if the third change value drops below the limiting value and the first or second change value is still above the limiting value. The transition correction is ended if all three change values fall below the limiting value.
The correction factor also depends on the cooling water temperature.
The invention is based on the fact that the decisive parameters for injection quantity correction in transition are considered to be the induction pipe pressure and its changes. The problem arises because a change in the induction pipe pressure caused by the opening and closing of the throttle valve is only recorded by the associated induction pipe pressure sensor after a certain time lag. This time lag is caused by pressure transit times in the induction pipe and increases with increasing induction pipe length. This makes the necessary rapid transition correction impossible.
In accordance with the invention, therefore, it is not the induction pipe

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patent: 5044342 (1991-09-01), Yamane et al.
patent: 5101795 (1992-04-01), Hirschmann et al.
patent: 5154152 (1992-10-01), Yamane et al.

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